D942 Electric Double Eccentric Butterfly Valve
• D942F (PTFE seat) and D942X (rubber seat) electric double eccentric soft-seal butterfly valve, PN6/10/16
• Six seal materials: CR, NBR, EPDM, PTFE, Silicone, FKM — wide temp range −268 to +250 °C
• Size range DN80–DN1600 (nominal DN50–DN2000), flanged RF ends, short and long body variants
• Motor operated with Tianjin Ertong QB/QZ type electric actuator (380V/220V AC)
• Suitable for air, water, sewage, steam, gas, oil, and corrosive media
Model: D942F / D942X Series | Pressure: PN6 / PN10 / PN16 | Connection: Flanged | Medium: Water, Air, Oil, Gas, Steam
Gaoshan Valve — D942 Electric Double Eccentric Soft-Seal Butterfly Valve
Motor-operated double-offset (double eccentric) flanged butterfly valve with Tianjin Ertong QB/QZ type electric actuator, available with PTFE (F) or rubber (X) seat and 6 seat material options for sizes DN80 through DN1600 across PN6, PN10, and PN16 pressure ratings.
Product Overview
The D942 series electric double eccentric butterfly valve combines the proven double-offset cam-lift disc design with a reliable motor-operated electric actuator, delivering precision remote flow control for large-scale industrial pipelines. Like the D342 worm gear and D642 pneumatic variants in the same family, the disc moves away from the seat immediately upon opening, minimizing friction, extending seal life, and allowing field-replaceable seats without removing the valve body from the pipeline. The addition of an electric actuator makes D942 the ideal choice for automated process control, SCADA integration, and applications requiring precise modulation or on-off cycling over long distances.
Built to GB/T 12238 standards with a flanged RF connection per GB/T 17241, the D942 supports short-body and long-body face-to-face dimensions to match different installation requirements. Six field-selectable seat materials cover the widest temperature and chemical spectrum of any double eccentric butterfly valve in the Gaoshan lineup — from cryogenic PTFE at −268 °C to high-temperature silicone at 250 °C. Body materials include ductile iron (Q), cast carbon steel (C), alloy steel, and stainless steel to satisfy diverse project specifications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Nominal Diameter (DN) | 80 – 1600 mm (nominal range 50 – 2000 mm) |
| Nominal Pressure (PN) | 0.6 / 1.0 / 1.6 MPa |
| Design Standard | GB/T 12238 |
| Face-to-Face | GB/T 12221 (short & long body) |
| Flange Standard | GB/T 17241 (RF raised face) |
| Disc Design | Double eccentric (double-offset) cam-lift |
| Operation Type | Electric motor operated (QB or QZ type actuator) |
| Power Supply | 380 V AC 3-phase / 220 V AC 1-phase (50/60 Hz) |
| Enclosure Protection | IP67 weatherproof |
| Control Mode | On-off (QB type) or modulating (QZ type) |
| Applicable Media | Air, water, sewage, steam, gas, oil, and corrosive media |
Pressure Test Ratings
| Pressure Class | Body Strength (MPa) | Seat Seal (MPa) | Air Seal (MPa) |
|---|---|---|---|
| PN6 (0.6 MPa) | 0.90 | 0.68 | 0.60 |
| PN10 (1.0 MPa) | 1.50 | 1.10 | 0.60 |
| PN16 (1.6 MPa) | 2.40 | 1.76 | 0.60 |
D942 vs. D342 & D642 — Actuator Comparison
The D942 electric valve shares the same double eccentric body design, seat materials, pressure classes, and body material options as the D342 (worm gear) and D642 (pneumatic) variants. The sole difference is the actuator type:
| Feature | D342 (Worm Gear) | D642 (Pneumatic) | D942 (Electric) |
|---|---|---|---|
| Actuator | Worm gear handwheel | Pneumatic rack & pinion | QB/QZ electric motor |
| Power Source | Manual | Compressed air 0.4–0.7 MPa | 380 V / 220 V AC |
| Max Size | DN2000 | DN500 | DN1600 |
| Control Mode | Manual (local) | On-off / modulating | On-off / modulating |
| Remote Control | No | Yes (solenoid) | Yes (DCS / SCADA) |
| Best For | Unpowered sites, large bore | Fast cycling, hazardous area | SCADA, remote automation |
Materials of Main Parts
| Part | Material Options |
|---|---|
| Body | Ductile iron, cast carbon steel, alloy steel, stainless steel |
| Disc | Gray cast iron, ductile iron, cast carbon steel, stainless steel & special materials |
| Seat / Seal Ring | Various rubber compounds, PTFE (6 options — see table below) |
| Stem | 2Cr13 martensitic stainless steel, stainless steel |
| Packing | O-ring, flexible graphite |
| Electric Actuator | Tianjin Ertong QB (on-off) or QZ (modulating) type |
Seal Material Selection & Temperature Range
Six field-selectable seat materials allow the D942 to handle the widest range of media and temperature conditions. Select the appropriate seat code based on your process fluid and operating temperature:
| Material | Code | Min Temp | Max Temp | Working Temp | Best For |
|---|---|---|---|---|---|
| Chloroprene (CR) | X | −40 °C | 82 °C | ≤65 °C | General water, mild chemicals, weather resistant |
| Nitrile (NBR) | J | −40 °C | 93 °C | ≤80 °C | Oil, fuel, gas, hydrocarbons |
| EPDM (YBX) | YBX | −40 °C | 150 °C | ≤120 °C | Hot water, steam, polar solvents, HVAC |
| PTFE (F) | F | −268 °C | 232 °C | ≤200 °C | Corrosive chemicals, acids, cryogenic service |
| Silicone (GX) | GX | −70 °C | 250 °C | ≤200 °C | Food-grade, high-temp air, pharmaceutical |
| Fluoroelastomer (FKM) | FJ | −23 °C | 204 °C | ≤180 °C | Aggressive chemicals, high-temp oils, acids |
Body Material Code
| Code | Body Material | Example Model |
|---|---|---|
| (default) | Gray cast iron (HT200) | D942X‑10 / D942F‑10 |
| Q | Ductile iron (QT450‑10) | D942X‑10Q / D942F‑10Q |
| C | Cast carbon steel (WCB) | D942X‑16C / D942F‑16C |
Electric Actuator Specifications
The D942 is equipped with Tianjin Ertong QB or QZ type multi-turn electric actuators, selected per valve size and torque requirement.
| Parameter | Specification |
|---|---|
| Actuator Series | QB (on-off) / QZ (modulating) |
| Power Supply | 380 V AC 3-phase 50 Hz (standard); 220 V AC 1-phase 50 Hz (optional) |
| Enclosure Rating | IP67 dust-tight & water immersion proof |
| Control Signal (QZ) | 4–20 mA DC input / output |
| Position Feedback | Potentiometer or 4–20 mA transmitter (optional) |
| Limit Switches | 2 × open + 2 × close torque/position switches (standard) |
| Manual Override | Declutchable handwheel (standard) |
| Optional Accessories | Heater (cold climate), position transmitter, local indicator, extra limit switches |
Dimensions & Weights
| DN (mm/in) | L Short (mm) | L Long (mm) | H1 (mm) | H (mm) | L1 (mm) | L2 (mm) | L3 (mm) | L4 (mm) |
|---|---|---|---|---|---|---|---|---|
| 80 / 3″ | 114 | 180 | 102 | 540 | 122 | 185 | 103 | 297 |
| 100 / 4″ | 127 | 190 | 112 | 558 | 122 | 185 | 103 | 297 |
| 125 / 5″ | 140 | 200 | 128 | 610 | 122 | 185 | 103 | 297 |
| 150 / 6″ | 140 | 210 | 145 | 730 | 122 | 185 | 103 | 297 |
| 200 / 8″ | 152 | 230 | 185 | 825 | 122 | 185 | 103 | 297 |
| 250 / 10″ | 165 | 250 | 220 | 895 | 122 | 185 | 103 | 297 |
| 300 / 12″ | 178 | 270 | 250 | 960 | 155 | 290 | 110 | 390 |
| 350 / 14″ | 190 | 290 | 280 | 1020 | 155 | 290 | 110 | 390 |
| 400 / 16″ | 216 | 310 | 316 | 1125 | 155 | 290 | 110 | 390 |
| 450 / 18″ | 222 | 330 | 344 | 1180 | 155 | 290 | 110 | 390 |
| 500 / 20″ | 229 | 350 | 370 | 1265 | 155 | 290 | 110 | 390 |
| 600 / 24″ | 267 | 390 | 440 | 1465 | 155 | 290 | 110 | 390 |
| 700 / 28″ | 292 | 430 | 505 | 1560 | 155 | 290 | 110 | 390 |
| 800 / 32″ | 318 | 470 | 570 | 1635 | 248 | 600 | 293 | 487 |
| 900 / 36″ | 330 | 510 | 630 | 1765 | 248 | 600 | 293 | 487 |
| 1000 / 40″ | 410 | 550 | 690 | 1890 | 248 | 600 | 293 | 487 |
| 1200 / 48″ | 470 | 630 | 820 | 2255 | 248 | 600 | 293 | 487 |
| 1400 / 56″ | 530 | 710 | 950 | 2495 | 368 | 655 | 368 | 591 |
| 1600 / 64″ | 600 | 790 | 1100 | 2880 | 368 | 655 | 368 | 591 |
Notes:
1. Overall height H can be extended per user requirements.
2. L1, L2, L3, L4 dimensions based on Tianjin Ertong QB or QZ type electric actuator.
3. Flange connection dimensions — refer to page P95 of the Flange Connection Dimensions Table.
Structural Drawing
Key Features & Benefits
Motor-Operated Remote Control
QB on-off or QZ modulating electric actuator with 380 V / 220 V AC supply and IP67 enclosure. Ideal for SCADA, DCS, and remote unmanned stations. Position feedback and limit switches provide real-time valve status.
Double Eccentric Cam-Lift Design
The disc lifts off the seat immediately upon opening, virtually eliminating friction during 90° rotation. This extends seat life dramatically and reduces motor torque demand compared to centerline butterfly valves.
Field-Replaceable Seat
Seat ring can be replaced on-site without removing the valve body from the pipeline, reducing downtime and maintenance costs for large-bore installations.
6 Seat Material Options
From cryogenic PTFE (−268 °C) to high-temperature silicone (250 °C), 6 seal materials match any process fluid — water, steam, oil, gas, acids, and food-grade media.
Short & Long Body Options
Dual face-to-face dimensions for each size allow direct replacement of existing gate or globe valves (long body) or compact new installations (short body).
Manual Override Handwheel
Declutchable manual handwheel is standard on all electric actuators, ensuring reliable operation during power outages or emergency situations.
Applicable Media
Water
Sewage
Steam
Coal Gas
Oil Products
Corrosive Media
Typical Applications
The D942 electric double eccentric butterfly valve is the go-to choice for automated flow control in large-diameter pipelines where remote operation, precise positioning, and reliable long-term performance are critical:
| Industry | Application |
|---|---|
| Water Treatment | Remote-controlled raw water intake, filter backwash, effluent discharge — DCS/SCADA integrated |
| Thermal Power | Circulating water pump discharge, condenser cooling water, condensate return lines |
| District Heating | Primary/secondary network isolation, booster pump stations, remote heat exchange substations |
| Petrochemical | Tank farm transfer lines, cooling water headers, product pipeline batch control |
| Steel Mills | Blast furnace cooling water, rolling mill descaling water, gas cleaning systems |
| Municipal Supply | Trunk main isolation, reservoir inlet/outlet, pressure zone management |
Request a Quote for D942 Electric Double Eccentric Butterfly Valve
Please specify: size (DN), pressure rating (PN6/10/16), body material (Q/C), seat material code (X/J/YBX/F/GX/FJ), power supply (380V/220V), and control mode (on-off/modulating). Our engineers will select the correct actuator size and provide a complete dimensional drawing.
Also Available in Double Eccentric Series
D342 Worm Gear
Manual worm gear actuated double eccentric butterfly valve. DN50–DN2000. Best for unpowered sites and large bore manual isolation.
D642 Pneumatic
Pneumatic rack-and-pinion actuated double eccentric butterfly valve. DN50–DN500. Dual-acting or spring-return. Best for fast cycling and hazardous area service.
D71X Centerline Wafer
Centerline wafer butterfly valve (lever operated). DN40–DN500. Compact, lightweight, and cost-effective for general isolation duty.