Product Answers

Rated pressure 0.2–0.6 MPa; rated voltage DC24V±10% or AC220V±10%; working medium compressed gas; relative humidity ≤85%. Medium temperature range: -25℃~80℃ with a domestic diaphragm, -34℃~100℃ with an imported diaphragm. Explosion-proof design standards: GB/T 3836.1, GB/T 3836.2, GB/T 3836.9.

Available models: 1" DCF-F2-Y-25, 1.5" DCF-F2-Y-40S, 2" DCF-F2-Y-50S, 2.5" DCF-F2-Y-62S, 3" DCF-F2-Y-76S, 3.5" DCF-F2-Y-102S.B, 4" DCF-F2-Y-102S, 4.5" DCF-F2-Y-115S, plus 3" DMY-F2-II-80. Material variants via suffix: -C = 304 stainless, -D = 316 stainless, -E = copper/zinc-limited body.

Available models: 3/4" DCF-F3-2L-B, 3/4" DCF-F3-Z-20, 1" DCF-F3-Z-25, 1.5" DCF-F3-Z-40S, 2" DCF-F3-Z-50S, 2.5" DCF-F3-Z-62S, 3" DCF-F3-Z-76S, 3.5" DCF-F3-Z-102S.B. Material variants via suffix: -C = 304 stainless, -D = 316 stainless, -E = copper/zinc-limited body.

Available models: 1" DCF-F3-Y-25, 1.5" DCF-F3-Y-40S, 2" DCF-F3-Y-50S, 2.5" DCF-F3-Y-62S, 3" DCF-F3-Y-76S, 3.5" DCF-F3-Y-102S.B, 4" DCF-F3-Y-102S, 4.5" DCF-F3-Y-115S, plus 3" DMY-F3-II-80. Material variants via suffix: -C = 304 stainless, -D = 316 stainless, -E = copper/zinc-limited body. F3 = compound (flameproof enclosure + encapsulation) construction.

Models: 3/4" DCF-F3-ZM-20, 1" DCF-F3-ZM-25, 1.5" DCF-F3-ZM-40S. Material variants via suffix: -C = 304 stainless, -D = 316 stainless, -E = copper/zinc-limited body. F3 = compound (flameproof enclosure + encapsulation) construction; ZM = external (male) thread.

DCF-Y immersed electromagnetic pulse valves — common ratings: working pressure 0.2–0.6 MPa (adjustable), recommended blow pressure 0.3–0.4 MPa, recommended pulse width 80–150 ms. Per size (model | recommended air-tank capacity | min tank diameter | min valve install centre distance | nozzle-to-tube-sheet distance | avg bag-bottom cleaning pressure | driven filter area | bag count | max bag spec): • DCF-Y-25 (1"): 45–70 L | ≥8" | ≥105 mm | 150 mm | 500 Pa | 6–10 m² | 8–10 | ∮130×2500 mm • DCF-Y-40S (1.5"): 80–200 L | ≥8" | ≥120 mm | 200 mm | 900 Pa | 16–22 m² | 10–12 | ∮130×4500 mm • DCF-Y-50S (2"): 150–300 L | ≥8" | ≥185 mm | 200 mm | 800 Pa | 26–32 m² | 13–15 | ∮160×5000 mm • DCF-Y-62S (2.5"): 170–300 L | ≥10" | ≥215 mm | 220 mm | 800 Pa | 36–42 m² | 14–16 | ∮160×6000 mm • DCF-Y-76S (3"): 300–500 L | ≥14" | ≥225 mm | 220 mm | 1100 Pa | 48–72 m² | 14–18 | ∮160×8000 mm • DCF-Y-102S.B (3.5"): 400–700 L | ≥14" | ≥225 mm | 200–250 mm | 1100 Pa | 72–100 m² | 18–25 | ∮160×8000 mm • DCF-Y-102S (4"): 600–1000 L | ≥14" | ≥225 mm | 250 mm | 1100 Pa | 100–120 m² | 22–29 | ∮160×8000 mm The related DMY-Ⅱ-80 (3") immersed valve shares the same body ratings but uses a lower 0.2–0.3 MPa recommended blow pressure. Recommended maximum filter bag length is noted per size (e.g. ≤2.5 m for 1", ≤8 m for 3"–4").

DCF-Z right-angle electromagnetic pulse valves — common ratings: working pressure 0.2–0.6 MPa (adjustable), recommended blow pressure 0.3–0.4 MPa, pulse width 80–150 ms. Per size (model | air-tank capacity | min tank diameter | min install centre distance | nozzle-to-tube-sheet distance | bag-bottom cleaning pressure | filter area | bag count | max bag spec): • DCF-Z-20 (3/4"): 45–70 L | ≥5" | ≥155 mm | 150 mm | 500 Pa | 4–6 m² | 8 | ∮120×2000 mm • DCF-Z-25 (1"): 45–70 L | ≥8" | ≥165 mm | 150 mm | 500 Pa | 6–10 m² | 8–10 | ∮130×2500 mm • DCF-Z-40S (1.5"): 65–120 L | ≥8" | ≥205 mm | 200 mm | 800 Pa | 16–22 m² | 10–12 | ∮130×4500 mm • DCF-Z-50S (2"): 150–300 L | ≥8" | ≥185 mm | 200 mm | 900 Pa | 26–32 m² | 13–15 | ∮160×5000 mm • DCF-Z-62S (2.5"): 250–300 L | ≥10" | ≥215 mm | 220 mm | 900 Pa | 36–42 m² | 14–16 | ∮160×6000 mm • The series also includes the compact DCF-2L-B (3/4") and the larger DCF-Z-76S (3") and DCF-Z-102S.B (3.5") — see the SKU table on this page; their air-tank sizing is covered in the air-tank sizing and filter area entry.

DCF-ZM right-angle male-thread (coupling) electromagnetic pulse valves — common ratings: working pressure 0.2–0.6 MPa (adjustable), recommended blow pressure 0.3–0.4 MPa, pulse width 80–150 ms. Per size (model | air-tank capacity | min tank diameter | min install centre distance | nozzle-to-tube-sheet distance | bag-bottom cleaning pressure | filter area | bag count | max bag spec): • DCF-ZM-25 (1"): 45–70 L | ≥8" | ≥165 mm | 150 mm | 600 Pa | 6–10 m² | 8–10 | ∮130×2500 mm • DCF-ZM-40S (1.5"): 65–120 L | ≥8" | ≥205 mm | 200 mm | 800 Pa | 16–22 m² | 10–12 | ∮130×4500 mm • DCF-ZM-20 (3/4") completes the series (also offered in stainless -C/-D versions) — see the SKU table on this page.

DCF-T straight-through (inline) electromagnetic pulse valves — common ratings: working pressure 0.2–0.6 MPa (adjustable), recommended blow pressure 0.3–0.4 MPa, pulse width 80–150 ms. Per size (model | air-tank capacity | min tank diameter | min install centre distance | nozzle-to-tube-sheet distance | bag-bottom cleaning pressure | filter area | bag count | max bag spec): • DCF-T-40S (1.5"): 65–120 L | ≥8" | ≥205 mm | 200 mm | 800 Pa | 16–22 m² | 10–12 | ∮130×4500 mm • DCF-T-50S (2"): 150–300 L | ≥8" | ≥185 mm | 200 mm | 800 Pa | 26–32 m² | 13–15 | ∮160×5000 mm • DCF-T-25S (1") completes the series — see the SKU table on this page.

Watson® WPS-CA/EP102.B immersed electromagnetic pulse valve (3.5"): working pressure 0.2–0.6 MPa (adjustable); recommended blow pressure 0.3–0.4 MPa; pulse width 80–150 ms; recommended air-tank capacity 700–800 L; min tank diameter ≥14"; min valve install centre distance ≥225 mm; nozzle-to-tube-sheet distance 250 mm; nozzle centre spacing 240 mm; average bag-bottom cleaning pressure 1100 Pa; driven filter area 72–100 m²; 18–25 bags; max bag spec ∮160×8000 mm. Xiechang is the Asia-Pacific agent for the Watson® WPS-CA line, so these valves interchange with the equivalent Xiechang DCF-Y 3.5" immersed valve.

Flow coefficients from laboratory testing at 0.3 MPa test pressure and 50 ms pulse width (Kv / Cv): Immersed valves (DCF-Y): • 1": 25.3 / 29.5 • 1.5": 53.8 / 62.8 • 2": 65.4 / 76.3 • 2.5": 186.7 / 217.9 • 3": 321.7 / 375.5 • 3.5": 393 / 458.7 • 4": 382.7 / 446.6 • DMY-Ⅱ-80 (3"): 220.9 / 257.8 Right-angle valves (DCF-Z): • 1": 16.5 / 19.2 • 1.5": 37.5 / 43.8 • 2": 55.3 / 64.6 • 2.5": 89.8 / 104.8 • 3": 130.2 / 152 Kv is the flow coefficient in m³/h at 1 bar differential; Cv is the imperial equivalent (Cv ≈ 1.167 × Kv).

O-ring selection reference for Watson (WY) / Xiechang (DCF-Y) immersed pulse valves (model | large O-ring | small O-ring | spray-pipe bore): • 1" (WY/Y-25): Φ67×5.3 | Φ30×2.65 | G1" • 1.5" (WY/Y-40S): Φ82.5×5.3 | Φ49×2.5 | G1.5" • 2" (WY/Y-50S): Φ132×7 | Φ58×5.6 | Φ60 (tol −0.03/−0.12) • 2.5" (WY/Y-62S): Φ160×7 | Φ73×5.6 | Φ75 (tol −0.03/−0.12) • 3" (WY/Y-76S): Φ177×7 | standard Φ87×5.6 or special Φ87×6 | Φ89 / special Φ88 • 3.5" / small-4" (WY/Y-102S.B): Φ180×7 | standard Φ103×5.3 or special Φ103×5.6 | Φ102 / special Φ101.5 • 4" (WY/Y-102S): Φ195×7.5 | Φ112×5.3 | Φ113 (tol −0.03/−0.12) • 4.5" (WY-115): Φ212×7 | Φ126×6 | Φ126 • DMY-Ⅱ-80: single O-ring Φ95×5.7 | — | Φ85 (tol −0.03/−0.12) O-ring dimensions are given as inner diameter × cord thickness (mm).

For even (equal-pressure) pulse jetting, the blow pipe is drilled with graduated nozzle holes: the hole nearest the valve is the largest and holes get progressively smaller toward the far end, compensating for pressure loss along the pipe. Recommended blow-pipe outer diameter per valve size: 3/4"→∮27, 1"→∮34, 1.5"→∮48, 2"→∮63, 2.5"→∮76, 3"→∮89, 3.5"→∮108, 4"→∮114 mm. Nozzle count depends on the number of filter bags served. Example (1" valve, ∮34 pipe, 8 nozzles, measured from the valve end): ∮11, ∮10, ∮10, ∮10, ∮10, ∮8, ∮8, ∮8 mm. Example (3.5" valve, ∮108 pipe, 18 nozzles): ∮25, ∮23, ∮23, ∮23, ∮22, ∮22, ∮22, ∮22, ∮21, ∮21, ∮21, ∮20, ∮20, ∮20, ∮20, ∮19, ∮19, ∮19 mm. Full hole schedules for every nozzle count are available from Xiechang per valve size.

Solenoid coil power ratings by valve line: • Xiechang valve: 30 W (AC220V standard coil; the DC24V standard coil draws 26 W) • Watson valve: 30 W • Jiechen valve: 26 W • F-series (mold-sealed / encapsulated, Ex mb): 22 W at temperature class T4, 2 W at T6 • F2-series (flameproof, Ex db): 4 W • F3-series (combined type): 18 W (24 V) Note: for Jiechen valves sold before August 2024, when replacing the coil the preferred choice is a 30 W coil.

Thread size to blow-pipe outer diameter correspondence for right-angle pulse valves: • G3/4" → pipe OD Ø27 mm • G1" → Ø34 mm • G1.5" → Ø48 mm • G2" → Ø60 mm (60.3) • G2.5" → Ø76 mm (76.1) • G3" → Ø89 mm (88.9) • G3.5" → Ø102 mm Use this table to match the valve outlet thread to the correct blow-pipe stock diameter.

Xiechang electromagnetic pulse valve model code, read position by position: • Type: DCF = regular valve; ZNF = smart (intelligent) valve; DMY = low-pressure valve. • Explosion-protection requirement: standard valves omit this; F / Fa = mold-sealed (encapsulated, Ex mb) type; F2 = flameproof (Ex db) type; F3 = combined type. • Structure: Z = right-angle female-thread; ZM = right-angle male-thread; Y, YA, YQ = immersed (submerged); T = straight-through (inline). • Size code: 20 = 3/4", 25 = 1", 40S = 1.5", 50S = 2", 62S = 2.5", 76S = 3", 102S.B = 3.5", 102S = 4", 115S = 4.5", plus 2L-B and Ⅱ-80. • Brand: Xiechang is omitted; JC = Jiechen. • Material: ADC12 aluminium alloy is omitted; C = 304 stainless; D = 316 stainless; E = A360 (copper & zinc content ≤0.5%). • Control: standard is omitted; DXK = pilot control. Ultra-low-pressure large-diameter valves use the DMY-Ⅲ series with size codes 200C = 8", 250C = 10", 300C = 12", 350C = 14", 400C = 16". Examples: DCF-Y-25 = standard immersed 1" valve; DCF-Y-50S-C = immersed 2" valve in 304 stainless; DCF-F2-Z-40S = flameproof right-angle 1.5" valve.

XC-PGQ spray-pipe (blow-tube) connectors — basic dimensions in mm (model | A | B | C | D | E | F | G | H thread): • XC-PGQ-Y25 (1"): 243 | 184 | 32.5 | 56 | 48 | 31 | 20 | G1" • XC-PGQ-Y40S (1.5"): 308 | 245 | 47 | 56 | 60 | 44.7 | 25 | G1-1/2" Main body material: ADC12; A360 (copper ≤0.5%, zinc ≤0.5%) is a custom option. Dimension B (length) can be customised.

Box-wall (tank-wall) connectors — basic dimensions in mm. XC-XBD single-head (model | A | B | C | D | box-wall hole ØE): • XC-XBD-20 (3/4"): 63 | 77 | 25.5 | 28 | 43 • XC-XBD-25 (1"): 65.5 | 77 | 32.5 | 35 | 55 • XC-XBD-40 (1.5"): 65 | 79 | 47 | 50 | 67 XC-XBS double-head (model | A | B | C | D | ØE | box-wall hole ØF): • XC-XBS-20 (3/4"): 63 | 118 | 55 | 59 | 25.5 | 43 • XC-XBS-25 (1"): 65.5 | 124 | 61 | 57 | 32.5 | 55 • XC-XBS-40 (1.5"): 65 | 122 | 58 | 60 | 47 | 67 Main body material: ADC12; A360 (copper ≤0.5%, zinc ≤0.5%) as a custom option.

Xiechang stainless-steel pulse valves are offered with a 304 body (model suffix -C) or a 316 body (model suffix -D). Two representative models: • Y-type immersed DCF-Y-50S-C / -D (2"): unit-time blow rate 1.01 L/ms; blow (filter) area 26–32 m²; voltage/power DC24V/26W or AC220V (50Hz)/26W; blow pressure 0.2–0.6 MPa; flange Ø177, valve height 180 mm, 6×Ø11 bolt holes, spray-pipe bore Ø60 (−0.03/−0.12). • ZM-type male-thread DCF-ZM-20-C / -D (3/4"): unit-time blow rate 0.22 L/ms; blow area 4–6 m²; DC24V/26W or AC220V (50Hz)/26W; blow pressure 0.2–0.6 MPa; inlet pipe Ø27 (0/−0.2), mating pipe Ø25 (0/−0.25). Common to both: main body material 304 or 316; working medium compressed air or inert gas; diaphragm temperature — imported standard −34~100 °C, domestic standard −20~80 °C, imported/domestic high-temperature −19~200 °C; protection class IP65; an explosion-proof coil can be fitted to make a flameproof version. Stainless bodies suit corrosive or hygiene-sensitive dust applications.

Xiechang explosion-protected pulse valves — markings, certificates and ratings: • DCF-F (mold-sealed / encapsulated type): explosion-proof coil marked Ex mb IIC T4 Gb / Ex mb IIIC T130 °C Db (22 W) and Ex mb IIC T6 Gb / Ex mb IIIC T80 °C Db (2 W); DC24V or AC220V (50Hz); T4 coil = 22 W, T6 coil = 2 W; working pressure 0.2–0.6 MPa; protection class IP65; CCC number 2024322307005851; explosion-proof certificate GYB25.1974X. • DCF-F2 (flameproof type): coil marked Ex db IIC T6 Gb / Ex tb IIIC T80 °C Db; DC24V/4W or AC220V (50Hz)/4W; working pressure 0.2–0.6 MPa; protection class IP67; electrical interface NPT 1/2"; aluminium-alloy coil housing; CCC number 2024322307006147; explosion-proof certificate GYB25.1975.X. • DCF-F3 (combined type): coil 24 V / 18 W. All versions run on compressed air or inert gas, and the installation site must be free of gases corrosive to the aluminium-alloy coil housing. These valves have passed national safety explosion-proof certification for use in explosive gas and dust atmospheres.

Unit-time blow rate (air discharged per millisecond of pulse) by model: Immersed (Y / YA type): • DCF-Y-25 (1"): 0.31 L/ms • DCF-Y-40S (1.5"): 0.74 L/ms • DCF-Y-50S (2", stainless -C/D): 1.01 L/ms • DCF-Y-76S (3"): 2.74 L/ms • DCF-Y-76S/II (3", 2nd generation): 2.75 L/ms • DCF-YA-76S (3", compact): 1.93 L/ms • DCF-Y-102S.B (3.5"): 3.91 L/ms • DCF-Y-102S (4"): 4.41 L/ms • DMY-Ⅱ-80 (3", low-pressure): 2.33 L/ms Right-angle (Z type): • DCF-2L-B (3/4"): 0.22 L/ms; DCF-Z-20 (3/4"): 0.23 L/ms • DCF-Z-25 (1"): 0.33 L/ms • DCF-Z-40S (1.5"): 0.85 L/ms • DCF-Z-76S (3"): 3.1 L/ms • DCF-Z-102S.B (3.5"): 3.3 L/ms Right-angle male-thread (ZM type): • DCF-ZM-20 (3/4"): 0.22 L/ms • DCF-ZM-25 (1"): 0.35 L/ms • DCF-ZM-40S (1.5"): 0.85 L/ms Straight-through (T type): • DCF-T-25S (1"): 0.35 L/ms • DCF-T-40S (1.5"): 0.87 L/ms Values are per-millisecond air discharge; multiply by pulse width to estimate air per pulse.

Diaphragm-assembly dimensions by valve DN (A = diaphragm outer diameter, B = bolt-hole circle / centre distance, C = rubber backing-plate diameter, all mm; plus bolt-hole pattern): • DN20: A 80.5 | B 66 | C 36 | 4×Ø6.5 • Universal small (pilot) diaphragm: A 66 | B 54 | C — | 4×Ø4.5 • DN25: A 96 | B 82 | C 46 | 5×Ø6.5 • DN40: A 112 | B 98 | C 62 | 6×Ø6.5 • DN50: A 160 | B 142 | C 76 | 8×Ø8 • DN62: A 189 | B 170 | C 94 | 8×Ø8 • DN76: A 200 | B 182 | C 105 | 8×Ø9 • DN89: A 202 | B 186 | C 120 | 8×Ø8.5 (domestic and imported DN89 share the same dimensions) • Imported DN102: A 215.5 | B 197.5 | C 124 | 12×Ø9 Use the outer diameter and bolt-hole circle to identify or cross-match the correct replacement diaphragm and repair kit.

The new-energy pulse valve (model suffix -E) is developed for the high-cleanliness production environment of the lithium-battery / new-energy industry, where lithium cells are chemically very active and copper/zinc contamination on the line must be minimised. Material: the valve body and cover are die-cast from a high-quality copper- and zinc-limited aluminium alloy with tested Cu and Zn content each ≤0.5%; exposed parts such as bolts and the clamp are also held to Cu and Zn ≤0.5%. Available structures/sizes: Z-type DCF-Z-20-E/25-E/40S-E/50S-E/62S-E/76S-E (3/4"–3"), ZM-type DCF-ZM-20-E/25-E/40S-E (3/4"–1.5"), and the immersed Y-type equivalents. Technical parameters: working pressure 0.2–0.6 MPa; working voltage DC24V / AC220V; operating temperature −20~80 °C with the standard diaphragm, −34~100 °C with the Continental® premium diaphragm; working medium clean compressed air; protection class IP65.

Watson® WPS-F-CA/TG female-thread (internal-thread) explosion-proof electromagnetic pulse valve. Sizes (model | size | connecting thread): WPS-F-CA/TG25 | 1" | G1"; WPS-F-CA/TG40 | 1.5" | G1.5"; WPS-F-CA/TG50 | 2" | G2"; WPS-F-CA/TG62 | 2.5" | G2.5"; WPS-F-CA/TG76 | 3" | G3". Technical standard: working pressure 2–6 bar; working medium clean air; voltage DC24V / AC220V/50Hz; power 22 W; protection class IP65; explosion-proof marking Ex mb ⅡC T4 Gb / Ex mD 21 T130 °C Db (mold-sealed "Ex mb" type). Installation drawings with full dimensions are provided on inquiry — request them via the contact form and we send the drawing pack for your sizes. Xiechang is the China general agent for Watson® Process Systems (Canada).

Watson® WPS-CA/EP ultra-low-pressure large-diameter electromagnetic pulse valve, sizes WPS-CA/EP200 (8"), EP250 (10"), EP300 (12"), EP350 (14") and EP400 (16"). Technical parameters: working pressure 0.05–0.1 MPa; working medium clean air; voltage DC24V (AC220V/50Hz); current 1.2A (0.5A); operating temperature −25~100 °C normal, transient 120 °C; relative humidity ≤85%; pulse width 0.15–0.3 s. Design features: a three-stage diaphragm structure balances the exhaust/inflation and damping so the valve is more sensitive with good flow; it greatly increases blow volume and strength while lowering blow pressure, giving stable, reliable and economical running; because supply pressure is under 0.1 MPa, the compressed air can be delivered by a Roots blower instead of a compressor — cheaper, easy to manage and economical to run. Xiechang is the China general agent for Watson® Process Systems (Canada).

Air-tank (header) volume, recommended tank diameter and driven filter area per valve model (model | min–max air-tank volume | recommended tank diameter | filter area | common bag spec): • DCF-Y-102S (4"): 900–2000 L | ≥13" | 82–120 m² | 20–30 bags ∮160×8000 • DCF-Y-102S.B (3.5"): 800–1500 L | ≥13" | 72–100 m² | 18–25 bags ∮160×8000 • DCF-Z-102S.B (3.5"): 800–1500 L | ≥13" | 68–88 m² | 16–22 bags ∮160×8000 • DCF-Y-76S (3"): 400–589 L | ≥12" | 48–72 m² | 14–18 bags ∮160×8000/6000 • DCF-Z-76S (3"): 350–403 L | ≥12" | (as Y-76S) • DCF-Y-62S (2.5"): 240–403 L | ≥10" | 36–42 m² | φ160×6000 / φ130×6000 • DCF-Z-62S (2.5"): 170–283 L | ≥10" • DCF-Y-50S (2"): 90–309 L | ≥8" | 26–32 m² | φ130×4500 / φ160×5000 • DCF-Z-50S (2"): 75–209 L | ≥8" • DCF-Y-40S (1.5"): 80–209 L | 240×240 | 16–22 m² | φ(120–130)×4500 • DCF-Z-40S (1.5"): 65–209 L | ≥8" • DCF-Y-25 (1"): 35–109 L | 180×180 | 6–10 m² | φ120×2000 / φ130×2500 • DCF-Z-25 (1"): 30–109 L | ≥6" • DCF-Z-20 (3/4"): 25–66 L | ≥5" | 4–6 m² | φ120×2000 • DCF-2L-B (3/4"): 30–109 L | ≥5" | 4–6 m² | φ120×2000 The smaller air tank is the minimum for adequate cleaning; the larger raises blow volume. Bag count columns list common driven filter-bag configurations.

Format: DCF-F-[material]-[size]-[body type]. Explosion-proof construction: F = encapsulation, F2 = flameproof enclosure, F3 = compound (flameproof + encapsulation). Body style: Z = right-angle internal thread, ZM = right-angle external thread, Y = immersion, T = straight-through. Material: ADC12 (omitted from code), -C = 304 stainless, -D = 316 stainless, -E = A360 (copper & zinc content ≤0.5%). Size ranges from 20 to 115S.

Ex = certified explosion-proof product. mb = encapsulation type (db = flameproof enclosure; db+mb = compound). II = Group II equipment (Group I is for coal-mine methane). IIC = suitable for hydrogen/acetylene atmospheres (higher rating than IIA/IIB). T4 = maximum surface-temperature group of 135℃. Gb = product protection level. For dust: IIIC = explosive dust (higher than IIIA/IIIB), T130℃ = maximum surface temperature, Db = protection level.

Decoding a DCF-F2 model number: • F2 = flameproof (Ex db) construction — the coil sits in a flameproof enclosure, as opposed to the F series’ encapsulated (Ex mb) coil • Structure letter: Z = right-angle (female thread), ZM = right-angle male thread, Y = immersed (tank-mounted), T = straight-through; the compact DCF-F2-2L-B is the 3/4" right-angle economy body • Size code: the number after the structure letter (20, 25, 40S …) — every size currently offered is listed with its inch and DN rating in the SKU table on this page • Material suffix — choose by environment: – no suffix: standard aluminium alloy, the default for general baghouse service – -C (304 stainless): corrosive atmospheres, washdown areas, food or chemical plants – -D (316 stainless): harsher chemical exposure and chloride-laden environments – -E (copper/zinc-limited alloy): lithium-battery and new-energy production lines where Cu/Zn contamination must be avoided (see the new-energy valve entry) Example: DCF-F2-Z-40S-C = flameproof right-angle 1.5" valve in 304 stainless.

In Xiechang's code, F3 denotes the compound explosion-proof construction, combining a flameproof enclosure (db) with encapsulation (mb). This gives dual gas-and-dust explosion protection (e.g. Ex db mb IIC T4 Gb / Ex tb mb IIIC T130℃ Db). It contrasts with F (encapsulation only) and F2 (flameproof enclosure only). Body styles and materials follow the same DCF-F3-[type]-[material] scheme.

Construction of the high-temperature diaphragm: • Coating: FKM (Viton) fluororubber — retains elasticity and chemical resistance in hot, aggressive flue gas where NBR would harden and crack • Base fabric: meta-aramid — the fibre family used in heat-protective gear, chosen because it keeps tensile strength at sustained high temperature where polyamide (nylon) fabric would lose it • A harder compound than the standard diaphragm, matched to high-temperature sealing When to choose it: high-temperature filtration lines (metallurgy, incineration, kilns) and any collector where compressed-air or housing temperature runs beyond the standard grades’ window. At sustained high temperature with frequent pulsing, pair it with a rubber backing plate rather than nylon. The exact service temperature range is in the technical parameters table on this page; the standard NBR construction is covered in its own entry.

Construction of the standard diaphragm: • Base: rubber-coated fabric — a woven reinforcement layer with an NBR (nitrile) coating. The fabric carries the pulsing load (this is what survives a million-plus flex cycles); the nitrile coating provides the air-tight seal • Reinforcement: an integrated metal frame layer keeps the diaphragm geometry stable against the valve seat • Compound grades: molded either from a domestic rubber compound or from German Continental® rubber compound — the Continental grade holds its flexibility further below freezing, which is what the premium buys • The high-temperature diaphragm is a different construction (FKM coating on aramid fabric) — see the high-temperature Viton repair-kit page Grade temperature ranges are in the technical parameters table on this page; how to choose between the grades is covered in the diaphragm selection entry.

What wicking is: the woven reinforcement inside a diaphragm behaves like a bundle of tiny channels. Water, oil or aggressive condensate that reaches a cut edge or a pinhole can travel along the threads deep into the material, swelling and delaminating the diaphragm from the inside — the outside can look fine while the fabric core is failing. Anti-wicking construction: the fabric is sealed so liquids cannot travel along the threads, and the compound resists aromatic and aliphatic hydrocarbons — a good match for lines with oil carry-over. When it matters: • Compressed air with recurring moisture (failed dryers, cold mornings, high-humidity climates) • Oil carry-over from lubricated compressors • Solvent- or gas-laden service It complements — never replaces — fixing the air itself: see the moisture and oil-contamination entries. For the standard kits’ material grades and temperature ranges, see the parameters table on this page.

How to choose: • Everyday service: the standard NBR diaphragm — the default fitted to Xiechang valves • Cold climates, outdoor collectors, high-altitude winters: the premium diaphragm molded from German Continental® rubber compound — its low-temperature limit sits well below the standard grade’s, keeping the rubber flexible through cold snaps that would stiffen a standard diaphragm • Hot flue gas / high-temperature filtration: the FKM (Viton) diaphragm on the high-temperature repair-kit page — fluororubber keeps sealing far beyond any nitrile grade’s window — domestic FKM compound serves sizes up to 2″, while larger high-temperature kits are molded from Continental® compound • Wet or oily compressed air: consider an anti-wicking fabric (see the anti-wicking entry) alongside fixing the air quality Two practical notes: • At sustained high temperature and high pulse frequency, pair the diaphragm with a rubber backing rather than nylon — nylon backing is chosen for corrosion resistance, and its adhesive softens when hot • Whichever grade you choose, the failure mode to watch is stiffening and cracking — see the maintenance warning-signs entry The temperature ranges themselves live in the technical parameters tables on the repair-kit pages.

Coil wiring procedure (Xiechang work instruction XCH-MB.03, for DC24V and AC220V standard solenoid coils): 1. Unscrew the M3 screw. 2. Pull out the terminal block. 3. Unscrew the cable gland from the protective cover. 4. Thread the signal wires through in order. 5. Connect the input signal wires to the signal terminals and the earth wire to the ground terminal. AC220V high-voltage coils must be earthed. 6. Reassemble the connector. 7. Insert the connector onto the coil pins and tighten the M3 screw.

Installation precautions for electromagnetic pulse valves: Before installation: 1. Remove all debris from inside the air tank, the blow pipe and the valve mating faces. 2. Machine the blow pipe exactly per the installation drawing. 3. Protect the valve: fit a filter and pressure regulator at the tank inlet and a drain valve at the tank bottom to ensure clean, dry compressed air; drain periodically per operating conditions. 4. Size the intake pipe to the tank volume so the air supply is adequate. During installation: 1. Apply lubricant to the immersed valve O-ring to stop it being crushed/extruded; do not remove the valve-to-blow-pipe O-ring and pre-fit it onto the pipe. 2. For threaded connections, wrap a suitable amount of PTFE sealing tape on the blow-pipe male thread. 3. Keep the valve perpendicular to the blow pipe to avoid the valve sticking or leaking. 4. Handle gently when installing or moving the valve — no rough handling. 5. Each control circuit may control only one pulse valve. After installation: 1. Do not weld on the air tank, flanges or connected blow pipe after the valve is fitted — weld slag or momentary high heat can scorch the diaphragm and shorten its life. 2. Avoid an over-long pulse signal, which keeps the valve from closing in time and wastes air; recommended pulse width is 80–150 ms. 3. In colder regions, insulate the valve appropriately. 4. Bleed all compressed air from the tank before removing or dismantling the valve.

Flameproof (Ex d / explosion-proof) pulse valve availability: products of DN25 and above can be built in a flameproof version. The small DN20 and DN25 flameproof valves are made only by Xiechang — competitors do not offer these sizes. The valves use a dedicated flameproof cable-entry connector with a G1/2" thread for the coil signal cable.

Main components of a Xiechang electromagnetic pulse valve (pilot-operated diaphragm valve), from the electrical end to the body: • Solenoid coil and plug-in connector assembly, retained by a circlip. • Moving iron-core (armature) assembly and iron-core spring, inside the pilot tube assembly; sealed by an O-ring and fixed with an M4 screw. • Pilot valve seat and pilot spring, retained by an M5 screw. • Universal (pilot) diaphragm assembly. • Valve cover, fixed to the body with M8 bolts. • Large spring. • Large main diaphragm assembly. • Valve body, with M10 bolts and the tank/flange sealing O-ring. On right-angle (Z/ZM) valves the outlet additionally carries a coupling nut, a dish-shaped washer and a seal ring. Functionally, the coil energises the pilot (armature) which vents the chamber above the large diaphragm; the pressure differential then lifts the large diaphragm to release the pulse of compressed air, and the large spring reseats it when the coil de-energises.

DXK pilot-controller plus air-controlled (pneumatically actuated) pulse valve system: instead of running signal wiring to each valve's own solenoid, a central DXK pilot controller houses the solenoids and pilots the field valves through compressed-air lines. Key points: • The pilot controller is available with 8, 10 or 12 solenoid positions. • Air-controlled pulse valves come in Z, Y, ZM and T structures. • The pilot controller and air-controlled valves must be used together (one cannot work without the other). • The common wiring terminal is pre-wired at the factory; the user connects the other terminal to the pulse-jet controller output. • Quick-connect fittings are factory-fitted; connect with Ø8 mm semi-rigid nylon tubing able to withstand 1 MPa. • Keep each air line short — recommended under 1.5 m. Product parameters: body material ADC12; voltage/power DC24V/18W or AC220V (50Hz)/18W; blow pressure 0.2–0.6 MPa; working medium compressed air or inert gas; diaphragm temperature imported −34~100 °C / domestic −20~80 °C; protection class IP65.

Feed the pulse valves clean, dry air at their rated blow pressure, and put a gauge at the manifold to check the actual pressure during operation — line losses and demand swings mean the header often sees less than a distant plant-air reading. Xiechang pulse valves operate at 0.2–0.6 MPa (recommended blow pressure 0.3–0.4 MPa). In general pulse-jet practice a cleaning pressure of about 6 bar (90 PSI) is common where valves are rated for it; dropping to roughly 4.8 bar (70 PSI) noticeably lowers cleaning efficiency, which forces more frequent pulsing that uses more air yet still under-cleans. Never exceed the valve's rated maximum — many pulse valves are designed for only about 8.6 bar (125 PSI).

What carries over, and what improves: • Drop-in fit: the same transparent hanging PC shell and identical mounting dimensions — an X8A1 can be swapped for an SK01-C8A1 without modifying the panel cutout or bracket • Full function coverage: every X8A1 control feature is retained, so existing cleaning programmes transfer directly • Power supply: the new model additionally accepts DC24V input alongside AC mains, covering both plant standards with one unit • Much wider timing adjustment: pulse width, pulse interval and cycle time can all be set across far broader ranges at finer resolution — the exact figures are in the technical parameters table on this page • Commissioning: a new jog mode fires valves one at a time from the panel, which the X8A1 never offered • Environment and efficiency: a wider operating-temperature window with lower power consumption The X8A1’s own specification table remains on its product page for side-by-side comparison.

Where the D32L sits in the range: • vs the SK01-C8A8-205L: the 205L is fixed at 20 pulse + 5 lift channels; the D32L’s channels are allocated to order, so unusual compartment layouts fit without compromise • vs the JK01-C8B2-D36L: the C8B2 adds a die-cast aluminium enclosure and digital inputs; choose it for harsh environments or when the controller must read lift-valve position and fan status — otherwise the D32L’s PC shell costs less • vs the X8A5/X8A7: the D32L belongs to the current Modbus-capable C-series platform, so a PLC or DCS can supervise it, and valve-circuit break detection is reported over the bus What the built-in ΔP sensor adds: cleaning triggered by actual filter resistance rather than a fixed timer, a live ΔP reading on the panel, zero calibration, and independent high/low alarms with relay outputs — with a timed fallback available so cleaning never stalls if the ΔP signal stays low. Specification values (channel count, supply options, timing ranges, offline timers, enclosure) are in the technical parameters table on this page; the general theory is covered in the “online vs offline cleaning” knowledge-base entry.

When the C8B2-D36L is the right choice: • Harsh locations: the die-cast aluminium enclosure withstands impact, dust and moisture better than plastic-shell models — pick it for outdoor or heavy-industry installations • Feedback wiring without a PLC: its digital inputs read lift-valve open/closed position, fan run status or remote start/stop contacts, and a supervising system can read them all over Modbus • Multi-collector sites: as master it steps through each slave controller’s cleaning in turn, automatically skips one that stops responding and raises an alarm, so a single failed unit never stalls the whole system • Diagnostics: valve-circuit break detection is standard; short-circuit detection is available on dual-power-supply versions Like the other C-series controllers it runs online or offline cleaning, takes its cleaning trigger from a timer or differential pressure (built-in sensor on “-P” versions), and accepts wide-range AC or DC24V supply. The exact channel count, timing ranges, offline timers and dimensions are in the technical parameters table on this page.

What the C5A1-8 gives a small collector: • One compact hanging unit runs the whole cleaning cycle — no PLC or external timer needed • Wide-voltage supply: the current revision accepts the common plant supplies worldwide without ordering variants • Demand cleaning on a budget: wire an external ΔP controller’s dry contact to the YC terminals and cleaning runs only when filter resistance calls for it; a configurable enable/debounce time filters contact chatter, and the display shows a waiting pattern while idle • Commissioning aids: a start-up delay that can be skipped from the keypad, jog mode to fire valves one at a time, and two selectable run views on the LED display What it deliberately leaves out — and when to upgrade: • No RS485/Modbus, no lift-valve (offline) control, no built-in ΔP sensor • More valves than it controls → SK01-C8A1; offline cleaning → SK01-C8A8-205L, D32L or C8B2-D36L; PLC/DCS supervision → any C8-series Modbus model All electrical ratings, timing ranges and enclosure dimensions are in the technical parameters table on this page.

What it replaces: • A standalone pulse controller, a ΔP transmitter on the collector, and a separate ΔP display in the panel — plus the signal wiring between all three Why that matters: • Demand cleaning out of the box: cleaning runs only when filter resistance actually rises, saving compressed air and bag wear, with no instrumentation project • Monitoring never sleeps: even when switched to timed cleaning, the ΔP reading stays live and the high/low alarm contacts keep working — a blinding filter or a burst bag still gets flagged • Simple installation: two pressure tubes to the clean and dirty plenums, power in, valve outputs out When to choose it: • Small-to-mid collectors that want ΔP-based cleaning without buying and wiring separate instruments • Retrofits where panel space and cable runs are tight • Sites without a PLC — the X8A5 makes its own cleaning decisions; if you need Modbus supervision or offline lift-valve control, choose a C-series controller instead All electrical ratings, channel counts and ΔP setting ranges are in the technical parameters table on this page.

Distinctive SXC-X8A7 capabilities: • Four trigger modes: (1) timed sequence; (2) ΔP-triggered from the internal sensor (start value and hysteresis adjustable — the range is in the parameters table on this page); (3) mixed mode — ΔP-triggered with a timed upper limit as a safety net so cleaning always happens; (4) external trigger via the X1 dry-contact input • ΔP retransmission: 4–20 mA output of the differential-pressure reading for a two-wire panel meter or PLC analogue input • Alarms: Y1/Y2 high-ΔP and Y3/Y4 low-ΔP dry contacts, both with adjustable hysteresis • Un-fired-valve query: wire a normally-open contact from the air-tank pressure gauge to X3; if tank pressure does not dip when a valve is pulsed, the controller logs that valve as not fired, and the query key steps through the flagged valve numbers — fast diagnosis of stuck or dead valves • Manual mode: fire valves one at a time from the panel; X2 input stops cleaning externally • Display: dual digital displays (valve number + time/parameter), brightness adjustable

SXC-X8B2 overview: • Channels: Y1–Y40, each usable for a pulse valve or a lift valve; online and offline cleaning in one unit (in offline wiring, Y1 drives the compartment lift valve followed by that compartment’s pulse valves) • Output: high-current DC24V with headroom for driving multiple coils per channel — the rating is in the parameters table on this page • Display: dot-matrix LCD with menu-driven parameters • Communication: RS485 A/B terminals connect to PLC or DCS for live status upload, parameter changes and remote start/stop; separate D+/D− port links multiple controllers for interconnected operation • Trigger: timed or ΔP dry contact, with adjustable ΔP enable (debounce) time • Enclosure: die-cast aluminium; dimensions and operating environment are in the parameters table Note: the X8B2 platform’s roles are covered in the current generation by the SXC-SK01-C8A8-205L, C8A9-D32L and JK01-C8B2-D36L, which add Modbus-RTU and built-in ΔP sensing.

Decoding Xiechang controller model numbers: • SXC- : Suzhou Xiechang controller prefix • Shell code: SK01/SK02 = transparent hanging PC shell; JK = metal enclosure (JK01 = die-cast aluminium, JK02 = carbon steel, JK03 = 304 stainless steel) • Platform: C8A1, C8A8, C8A9, C8B2, C5A1 — the electronics generation (C-series is the current Modbus-capable platform; X8Ax/X8Bx are the earlier generation) • Channel suffix: – 10/20/30/40L or H: number of pulse-valve channels (L = DC24V output, H = AC220V output on the classic X8A1) – 205L = 20 pulse-valve + 5 lift-valve channels – D32L / D36L = 32 / 36 channels, pulse and lift valves freely allocated • Sensor option: -P = built-in differential-pressure sensor, -M = without sensor • FB = explosion-proof (flameproof) enclosure versions, e.g. SXC-X8A4-FB, SXC-FB-40 Example: SXC-JK01-C8B2-D36L-P = aluminium-enclosure C8B2 controller, 36 channels, with built-in ΔP sensor.

Pulse-controller trigger modes: • Timed: valves fire in sequence at the set pulse interval, cycle after cycle. Predictable, but cleans even when the bags are still clean — highest compressed-air use. • Differential-pressure (ΔP): cleaning runs only when filter resistance crosses the start value. The signal can come from an external ΔP controller/transmitter via a dry contact (most models), or from a built-in sensor (X8A5, X8A7, C8A9/C8B2 "-P" versions). A ΔP enable/debounce time filters contact chatter. This is demand cleaning — it saves compressed air and extends bag life. • Mixed (ΔP + timed fallback): ΔP-led, but if ΔP stays below the threshold a timed cycle still runs after a set upper limit (the settable range is in the product’s parameters table). Recommended where dust load varies widely but you never want cleaning to stall. • External: a remote dry contact (X1 input, PLC output or push-button) starts a cleaning cycle; a second input can stop cleaning. Used when a plant DCS owns the cleaning decision. On current C-series models the mode is selected by function code F1, with the ΔP-timeout fallback configured by F2.

Selection guide by application: • Small single filters (≤8 valves): SXC-C5A1-8 — compact, wide-voltage, timed or ΔP dry-contact • Standard online cleaning (≤40 valves): SXC-SK01-C8A1 — the current X8A1-successor platform with jog debugging; SXC-X8A4 for a metal enclosure • Modular large systems (40–120 valves): SXC-X8A1-H/L with expansion modules, or multiple networked C-series units • Offline cleaning with lift valves: SXC-SK01-C8A8-205L (20 pulse + 5 lift), SXC-SK01-C8A9-D32L (32 channels, built-in ΔP sensor option), SXC-JK01-C8B2-D36L (36 channels, aluminium enclosure, 6 digital inputs, master–slave) • Demand cleaning from filter ΔP without external instruments: SXC-X8A5 (3-in-1 with sensor and alarms) or SXC-X8A7 (adds 4–20 mA retransmission, mixed mode and un-fired-valve detection) • PLC/DCS-supervised plants: any C-series Modbus model; SXC-X8B2 remains the LCD legacy option • Explosion-proof areas: SXC-X8A4-FB or SXC-FB-40 (explosion-proof enclosures) If in doubt, tell us the number of valves, online or offline cleaning, supply voltage and whether your PLC needs to supervise cleaning — we will match the model.

Thread the valve inlet to the air tank and tighten clockwise to prevent leakage. Connect the blowpipe's threaded end to the valve outlet and tighten clockwise. Pass the blowpipe through the box-wall connector and tighten the union joint for an airtight seal. Coil direction is adjustable: loosen the hex-socket lock screw, rotate the coil clockwise to the required direction, then re-lock. Explosion-proof connector size: 1/2 NPT.

As an immersion-type valve, the blowpipe penetrates from the bottom of the air (distribution) tank. Thread the valve inlet to the air tank and tighten clockwise to prevent leakage; connect the blowpipe's threaded end to the valve outlet and tighten clockwise. Coil direction is adjustable: loosen the hex-socket lock screw, rotate the coil clockwise to the required direction, then re-lock.

The DCF-F2-ZM is the external (male) thread type. Install the XBS bulkhead connector onto the dust-collector wall; connect the blowpipe to both ends of the bulkhead connector; pass the blowpipe through the box-wall connector; rotate the union joint clockwise and screw it into the threaded end of the bulkhead connector for an airtight seal.

Installation of ultra-low-pressure large-diameter pulse valves (Xiechang manual XCH-MB.02): Box contents — 8"–10": spring and PTFE tape; 12"–16": adapter, pilot valve, spring and PTFE tape. 1. Open the valve packing box and the large-diaphragm box. 2. Place the large diaphragm on the air tank, aligning the diaphragm bolt holes with the tank flange bolt holes. Note: the aluminium metal plate face must point up. 3. Seat one end of the spring in the spring retainer plate. 4. Fit the valve cover so the other end of the spring locates inside it; align the cover bolt holes with the tank flange, insert all bolts first, then tighten diagonally. 5. (12"–16" only) Wrap PTFE tape on the small-thread end of the adapter and screw it into the second-stage cover; tighten so it cannot leak in service. 6. (12"–16" only) Wrap PTFE tape on the large-thread end of the adapter, mount the pilot valve and tighten; observe the pilot valve flow-direction arrow. 7. After assembly, carry out a pressure-hold test at 0.1 MPa to confirm there are no leaks at the joints.

Xiechang right-angle pulse valves come in two structures — DCF-Z (right-angle, female thread) and DCF-2L-B — and are selected together with matching fittings for easy, reliable installation: • Box-wall (bulkhead) connector: XC-XBD single-head (blowpipe passes through and connects to the valve outlet, sealed by one nut) or XC-XBS double-head (blowpipe on the inside end, air tube on the outside end, both sealed by nuts). Matched by size, e.g. connection tube OD DN20→Ø27, DN25→Ø34, DN40→Ø48. • Special union: XC-HJD(Z) type, for flexible connection of the air-manifold exhaust tube. • Round air manifold: XC-YQX(Z), matched to valve size (XC-YQX(Z)-20/25/40 for DCF-Z-20/25/40S). Four installation modes are available for the common DCF-Z-20/25/40S sizes — H-D, H-S, G-S and F-S; the DCF-2L-B uses the H-J-D mode. G-S and F-S modes are more economical but the valve must be screwed up to remove it. Use the correct crescent (hook) wrench for the box-wall connector: No.68-72 for 3/4", No.78-85 for 1", No.90-95 for 1.5". Notes: keep the blowpipe screwed no more than 27 mm into the valve/connector; fit a filter and pressure regulator on the manifold inlet and a drain valve at the bottom. The valve’s electrical and pressure ratings are in the technical parameters table on this page.

In a pulse-jet baghouse the compressed-air pulse is what knocks the dust cake off the inside of each filter and keeps it breathing. Treat that air as a critical, dedicated cleaning utility — not just "plant air": it must arrive clean, dry and at the right pressure at the manifold (header), on every pulse. If it is wet, oily or under-pressured you will not clean well — the dust cake stays put, DP keeps climbing, airflow falls, and you end up pulsing constantly without returning to your low DP setpoint. Verify quality and pressure at the header itself, not somewhere else in the plant. In heavy-dust industries such as foundries this matters even more.

Oil carried in the compressed air is a real problem, not a myth. Like water, oil contamination leaves a residue on the filter fibers that traps dust, fouls the media and shortens bag life, and it can also damage the internals of the pulse valves. Keep the supply air dry and oil-free: fit appropriate coalescing filtration upstream of the manifold and replace the elements on schedule — oil-removal elements are consumables, so a one-time filter install does not solve it permanently.

Geography changes the compressed-air plan. Elevation and temperature affect air density, and that affects both the fan and how much energy each pulse actually delivers. In cold regions (down to −40 °C) any moisture in the air system can freeze the valves — a design and maintenance issue, not just an operating one. Physical access also matters: a collector with lift-off doors on top may be fine in a warm climate but a poor choice where crews must change bags in deep winter. Design for your specific climate — air treatment, freeze protection and safe maintenance access — rather than assuming a one-size-fits-all collector works everywhere.

Pre-coat is a design/operations tool for sticky fumes: a powder such as perlite or crushed limestone is fed from a bulk bag into a hopper and blown into the duct ahead of the baghouse, coating the filters evenly so sticky material cannot bond directly to the fibers. If you handle sticky dusts and do not pre-coat, you are asking the pulses to do more than they can — sticky dust plus moisture blinds filters in a way pulse energy alone cannot recover. For sticky dusts or chronically short bag life, consider a continuous pre-coat system so the pulses can do their job, and keep the supply air dry.

When compressed air is an ongoing headache, look at the whole picture rather than band-aiding with lower setpoints or more pulses. Ask: is the compressor undersized? Is the receiver (storage) tank too small to cover pulse demand? Is the cleaning air shared with other heavy-demand equipment that starves the header? Often the answer is not tweaking valves — it is infrastructure: a bigger receiver tank, a better dryer, or a dedicated line for the collector. Run a compressed-air audit and fix the systemic issues so every pulse gets the clean, dry, full-pressure air it needs.

High-performance media such as a PTFE membrane is a real upgrade — the smooth surface sheds dust more completely on each pulse, which improves cleaning and can lower differential pressure, and it handles fine particulate and higher temperatures. But swapping media is not a cure-all. If the underlying problem is process-driven — hydrocarbon or oily mist blinding the fibers, sticky or hygroscopic dust, or spark carry-over — new bags will blind again unless the process is controlled too. Pair the media with the right controls for the duty: a continuous pre-coat (hydrated lime, perlite, or diatomaceous earth) to keep fines off the fibers, a spark arrestor where ignition sources exist, clean and dry compressed air, and correctly set pulse cleaning. Treat filter media, pulse-cleaning air, and maintenance as one system: the pulse valves clean the media, but only media matched to a well-controlled process stays clean over time.

When it is the right model: • Your collector is divided into compartments (up to 5) with lift/poppet valves, and dust is fine, sticky or re-entrains easily — the cases where online cleaning struggles to bring differential pressure down • You want one controller to run both the pulse valves and the lift valves, instead of wiring a PLC programme for the sequencing • A host system needs visibility: the RS485 Modbus-RTU port reports status and accepts parameter changes and remote start/stop from a PLC or DCS What the offline cycle does: the controller takes one compartment off-line, waits for its airflow to die down, fires that compartment’s pulse valves in still air, pauses so the dislodged dust drops into the hopper, then returns the compartment to service and rests before starting the next one. Each stage has its own adjustable timer; the ranges and factory defaults are in the technical parameters table on this page, and the general theory is covered in the “online vs offline cleaning” knowledge-base entry. If you need more channels or a built-in ΔP sensor, step up to the C8A9-D32L or the aluminium-enclosure C8B2-D36L.

Online vs offline pulse cleaning: • Online: pulse valves fire compartment by compartment while all compartments continue filtering. Simple and continuous, but some dislodged dust can be re-entrained onto the bags by the ongoing airflow — especially with sticky or fine dust and high filtration velocity. • Offline: the controller closes one compartment’s lift (poppet) valve to stop airflow through it, cleans that compartment’s bags, lets the dust settle, then reopens the valve and moves on. Cleaning happens in still air, so it is markedly more effective per pulse. Offline sequence timers (as on the SXC-SK01-C8A8-205L and related models): • Wait time: delay after the lift valve closes before the first pulse, letting airflow stop completely • Settle time: delay after the last pulse before the lift valve reopens, letting dislodged dust fall into the hopper • Idle time: pause before the next compartment’s cycle begins, limiting the total system pressure disturbance Each timer’s range and factory default are listed in the technical parameters table on the offline controllers’ product pages. Choose offline cleaning when dust is fine, sticky or re-entrains easily, or when differential pressure will not come down under online cleaning.

PLC/DCS integration: • Interface: RS485, Modbus-RTU protocol (C8A8/C8A9/C8B2 platforms; the flagship chamber controller adds Modbus-TCP over Ethernet) • Slave address and baud rate are configurable from the panel — the ranges and defaults are in each model’s technical parameters table • What the host can do: read run status, ΔP value and valve break-detection flags; write pulse width, interval, cycle and mode; start and stop cleaning remotely Master–slave interconnection (multi-compartment or multi-collector sites): • One controller is set as master (function code FA = number of slaves); slaves get consecutive addresses (F4) and DP mode; FB sets the slave-timeout in minutes • The master steps through each slave’s cleaning in turn; if a slave does not respond within the timeout it is skipped automatically and an alarm is raised, so one failed unit never stalls the whole system Verified performance (factory type tests): 20 controllers multi-dropped under one PLC with stable control, and 120 m of communication cable at 19200 baud without errors.

Leads ① and ② are the input signal wires and ③ is the ground terminal. Connect the coil input signal terminals to the controller and connect the ground terminal to earth. The coil housing has its own grounding terminal — loosen the terminal screw and connect it to ground. When fitting explosion-proof conduit over the leads, the lead joint (threaded to the housing at M14×1.5) can be unscrewed and an external-thread fitting installed to connect the conduit. Applies to DC24V and AC220V explosion-proof coils.

Ultra-low-pressure large-diameter pulse valve — operating conditions and fault guide (Xiechang manual XCH-MB.01). Operating conditions: DC24V/1.2A/30W or AC220V/0.5A/30W; ambient −25~85 °C; working pressure 0.05–0.1 MPa; working temperature −25~100 °C (transient 120 °C); medium clean compressed air. Common faults (symptom → cause → remedy): 1. Energised but won't open, coil doesn't act, no sound in the pilot head → (a) voltage mismatch — check the control-signal voltage matches the valve; on DC especially, thin or long wires drop the voltage below the pilot pull-in level; (b) pulse width too short — lengthen it, 150–200 ms recommended; (c) no signal reaching the coil, or coil burnt out — ensure the signal arrives, replace a burnt coil; (d) armature stuck — normally the pilot head knocks audibly with each pulse; clean or replace the pilot assembly. 2. Pilot clicks but the valve doesn't blow → (a) tank pressure too low, diaphragm has no blow differential — adjust blow pressure to 0.05–0.1 MPa; (b) poor compressed-air quality clogging the damping passage — improve air quality, then open the valve and check the damping passage for blockage. 3. After installation, pilot leaks from the outlet with the coil off → (a) pilot head knocked askew on install, armature can't close — align the pilot tube, replace the pilot assembly if needed; (b) armature stuck — clean/replace the pilot assembly; (c) large diaphragm damaged — replace it; (d) valve-seat sealing face damaged — replace the seat. 4. After installation, leak from the second-stage cover exhaust port with the coil off → (a) pilot valve not closing — troubleshoot/replace the pilot; (b) second-stage diaphragm damaged — replace the universal diaphragm; (c) cover sealing face damaged — replace the universal seat. 5. Weak blow sound → (a) tank pressure too low, diaphragm not fully opening — adjust blow pressure to 0.05–0.1 MPa; (b) primary large diaphragm damaged — replace it.

Moisture is one of the most destructive things you can feed a pulse-jet collector. Water inside the bag turns the dust cake into a sticky paste the pulse cannot shed, so cleanability is lost and DP will not recover — especially with sticky dusts. In cold climates any moisture left in the system can freeze pulse valves solid; this is a major risk for outdoor collectors and bin vents in sub-freezing regions (down to −40 °C). Prevent it: dry the air with a desiccant dryer (or another method suited to your conditions), drain condensate routinely, and winterize — protect exposed lines and valves from freezing, drying the air first and adding heat/tracing if needed.

When the controller is set for clean-on-demand, the collector starts a clean-down at the high DP setpoint and keeps pulsing until it reaches the low setpoint. In healthy operation that sawtooth lives in roughly a 1-inch water-column window (about 249 Pa / 0.25 kPa). Watch the trend, not just single readings. If the collector can no longer pulse down to the low limit, or it is pulsing constantly, the filters are likely spent or the air quality/pressure is wrong — the same signs apply to both bag and cartridge collectors. Plan a bag change before failure, and fix the root cause rather than simply lowering the setpoint to hide the symptom.

Over-pulsing wears out both filters and valves: every pulse flexes the filter media and cycles the valve, so too many pulses mean shorter bag life and higher compressed-air consumption. Calibrate the high and low DP setpoints so the collector spends most of its time drifting between them, not hammering the valves. Frequent pulsing is a symptom, not a cure — do not use it to compensate for wet or oily air or worn-out filters; fix the air quality or change the filters instead.

Pulse valves give clear warning signs. Listen for hissing — that usually means a leaking diaphragm. Check that the valve snaps open sharply with force; a weak "pop" means it is not delivering the full pulse of air, so a row of bags will stop cleaning. Diaphragms and solenoid coils are wear parts: replace them proactively rather than waiting for failure, because a planned rebuild is far cheaper than downtime. Stock spare diaphragms and solenoids, and rebuild valves on an annual cadence — sooner if the duty is heavy. Do not wait until a section of bags stops cleaning to investigate a sticky or leaking valve.

When DP stays high even though the valves are pulsing, diagnose the whole cleaning chain rather than one part. 1) Valve action: each valve should snap open sharply and deliver a strong pulse; a hiss or a weak pop points to a leaking or sluggish diaphragm. 2) Air-receiver (tank) pressure: watch the gauge at the manifold during a cleaning cycle — if the tank cannot recover to rated pressure between pulses, the receiver is undersized or the supply cannot keep up, and every pulse under-delivers. 3) Blow pipe and nozzles: check the pipe is aligned over the bag rows and the orifices are clear and undamaged. 4) Controller settings: verify the pulse on-time and the interval between pulses suit the dust load, and that the high/low DP setpoints are realistic. 5) Air quality and pressure: the air must be clean, dry and at the valve's rated pressure, measured at the manifold rather than at a distant plant-air point. Only after ruling out air quality, pressure and valve delivery should you conclude the media is at fault: if strong pulses with good air still will not bring DP down, the bags are blinded and need replacing — lowering the setpoint only hides the problem.

A pulse valve that 'acts' is not the same as one that cleans, and the noise it makes is a poor guide. Use three checks. 1) DP response per row: a healthy pulse makes the differential pressure on that section fall; if DP does not move when a valve fires, that row is not being cleaned. 2) Air-receiver recovery: watch how fast the tank pressure rebuilds between pulses — slow recovery means each pulse is starved of air and lands soft, even if it sounds normal. 3) Valve-to-valve consistency: compare the strength of every valve; one that is markedly weaker than its neighbours is the suspect. Common root causes are a leaking or hardened diaphragm (often heard as a continuous hiss), blow pressure below the valve's rating, or a partially blocked valve seat or blow-pipe orifice. Confirm the diaphragm and coil, verify clean dry air at rated pressure measured at the manifold, and clear or realign the blow pipe before assuming the filter media is the problem.

Frequent pulsing is not always a valve fault — it is often a downstream problem. If the hopper does not discharge dust promptly, the level rises into the filtration zone, and bridging or re-entrainment throws already-collected dust back onto the bags. Those bags re-load almost as fast as the pulse cleans them, so the differential-pressure controller keeps firing the pulse valves and DP still will not come down. The side effects hit the valves directly: higher compressed-air consumption and many extra diaphragm cycles, shortening valve and diaphragm life for no cleaning benefit. Diagnose it as a chain: if the pulses are strong and the air is clean, dry and at rated pressure, yet DP stays high and the valves pulse constantly, inspect the hopper and dust-discharge system next — check that the rotary airlock / screw conveyor / discharge valve is actually turning, look for bridging or rat-holing, and confirm the level is being drawn down. Fixing the discharge often stops the over-pulsing that looked like a valve problem.

Xiechang electromagnetic pulse valves have undergone environmental and protection type-testing: low-temperature operation stabilised at -20°C (GB/T 2423.1), IP54 dust-and-splash protection (GB/T 4208), sulfur-dioxide corrosion resistance (GB/T 2423.33), and dielectric testing (insulation resistance at 500V, dielectric withstand at 1000V, per JB/T 9536-2013). Results: no appearance damage, no insulation breakdown, and no surface flashover. (Third-party test report FT-20250609067, Shanghai Fuda Testing.)

Xiechang DCF-F explosion-proof pulse valves hold Ex certificate No. GYB25.1974X, issued to the GB/T 3836.1, 3836.9, 3836.13, 3836.15 and 3836.16 standards. Coverage spans the full DCF-F range — right-angle (Z), immersion (Y), external-thread (ZM), straight-through (T) and 2L-B body styles in all sizes, with 304 / 316 / A360 material variants (-C / -D / -E suffixes). Protection rating IP65 / IP67; ambient temperature ranges from -40℃ to +60℃ depending on the series.

Xiechang explosion-proof pulse valves hold China Compulsory Certification (CCC): F series certificate No. 2024322307005851 (IP65 / IP67), F2 series No. 2024322307006147 (IP66), and F3 series No. 2024322307006175. These accompany the Ex type certification (GYB25.1974X) issued to the GB/T 3836 standards for combined gas-and-dust explosion protection.

Xiechang's WPS-F (Watson) explosion-proof electromagnetic pulse valve series holds Ex certificate No. GYB25.2393X, issued by NEPSI. Explosion-proof marking: Ex mb IIC T4 Gb / Ex mb IIIC T130°C Db (encapsulation type, gas and dust). Certified to GB/T 3836.1-2021 and GB/T 3836.9-2021 (product standard Q/320500 HSXC 004-2022), covering models WPS-F-CA/TGA, TGB, TDA, TDB, EGA, EGB and EP. Validity: 30 Jul 2025 to 29 Jul 2030.

Advantages of the Xiechang DMY-III ultra-low-pressure large-diameter electromagnetic pulse valve (8"–16"): • Valves of 12" and above use a pilot-valve structure. • Three-stage diaphragm design gives high sensitivity. • The first-stage valve seat is manufactured integral with the air tank, so the valve has low internal resistance and good flow. • The first- and second-stage large diaphragms use the GARLOCK brand, guaranteeing a 1,000,000-cycle service life. • Low blow pressure yet large blow-air volume, so a single valve can clean a large number of filter bags. • Suited to Roots-blower air supply — energy-saving and simple to manage. Ratings: voltage/power DC24V/30W or AC220V (50Hz)/30W; blow pressure 0.05–0.1 MPa; working medium compressed air or inert gas; diaphragm working temperature −25~100 °C; ambient temperature −25~80 °C; protection class IP65; an explosion-proof coil can be fitted to make a flameproof version.

Reliability and type tests applied to Xiechang controllers: • High/low voltage: continuous operation at AC240–250V and AC175–185V supply • Safety: deliberate output-port short circuit (simulating a shorted solenoid coil) without damage • Load capability: two pulse valves driven from one output channel on the standard power module • Low temperature: 120 h continuous operation at −30°C, including cold power-up • High temperature: 120 h continuous operation at +70°C • Vibration: 2 h on a 30 Hz vibration table with no damage • Drop: packaged drop from 2 m onto concrete (three edges and six faces) with the unit surviving • Pulse accuracy: set pulse widths of 100, 150 and 200 ms verified at the outputs • Communications: Modbus function verification against the address table, 120 m cable run at 19200 baud, and 20 controllers running under one PLC concurrently These tests back the published operating-temperature window with margin at both ends.