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Electric double-seat control valve

Electric double-seat control valve

It is used to automatically regulate the flow rate, pressure, temperature and liquid level of the medium. It is suitable for working conditions with large pressure difference and large flow rate, and is widely used in pipeline systems of petroleum, chemical, power, heating, HVAC and other industries.
- GB/T 12224 General requirements for steel valves
- GB/T 12221 Face-to-face, end-to-end and centre-to-face dimensions of metal valves
- GB/T 13927 Pressure test for industrial valves
- GB/T 26480 Inspection and testing of pipeline valves
- GB/T 17213 Industrial process control valves
- JB/T 8528 General technical requirements for electric valve actuators
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Product Detail
The electric actuator receives standard control signals (typically 4–20 mA DC electrical signal) and converts them into linear displacement.
It drives the valve stem to move up and down, which simultaneously lifts or lowers the upper and lower double plugs fixed on the stem.
By changing the flow area between plugs and seats, the valve accurately adjusts the flow rate, pressure, temperature or liquid level of the medium.
Due to the double‑seat structure, the fluid pressure acts on both plugs in opposite directions, offsetting the unbalanced force. This enables the valve to work stably under large pressure difference and high‑flow conditions.
Combined with sensors and control system, it realizes automatic closed‑loop regulation to maintain stable working conditions.
Main technical parameters：
DN(mm) G3/4* 20 25 32 40 50 65 80 100 125 150 200
Seat diameter (mm) 3 4 5 6 7 8 10 12 15 20 26 32 40 50 65 80 100 125 150 200
Rated flow coefficient (Kv) 0.08 0.12 0.2 0.32 0.5 0.8 1.2 2 3.2 5 8 12 20 32 50 80 120 200 280 450
Nominal Pressure PN (MPa) 1.6, 4.0, 6.4 (Normal temperature), 4.0, 6.4 (Medium temperature), 0.6, 4.0, 6.4 (Low temperature)
Travel (mm) 10 16 25 40 60
Movement Speed (mm/s) 4.2 2.1 3.5 1.7 3.4
Flow characteristics Straight line Straight line, and so on percentages
Medium temperature (℃) 20~200℃, -40~250℃ (Normal temperature), -40~450℃ (Medium temperature), -250~60℃ (Low temperature)
Flange size Cast iron flange acc. to JB/T78-94, cast steel flange acc. to JB/T79-94
Body Material PN(MPa) 0.6 Low temperature: -250~60℃: ZG1Cr18Ni9Ti
1.6 Normal temperature -20~200℃: HT200
4 Normal temperature -40~200℃: ZG230-450, ZG1Cr18Ni9Ti
Medium temperature -40~450℃: ZG230-450, ZG1Cr18Ni9Ti
Low temperature -250~-60℃: ZG1Cr18Ni9Ti
6.4 Normal temperature -40~200℃: ZG230-450, ZG1Cr18Ni9Ti
Medium temperature -40~450℃: ZG230-450, ZG1Cr18Ni9Ti
Low temperature -250~-60℃: ZG1Cr18Ni9Ti
Core material 1Cr18Ni9
On valve cover pattern Ordinary type (Normal temperature), heat-piece (Medium temperature), long-necked type (low temperature)
With Electric actuator model 361LSA-08 361LSA-20 361LSB-30 361LSB-50 361LSC-65
361LXA-08 361LXA-20 361LXB-30 361LXB-50  
When ordering please indicate:
1. product model;
2. nominal size;
3.DNG3/4" and the DN20mm two kind of specifications must indicate the valve seat diameter or indication rated flow coefficient KV;
4. Discharge characteristic;
5. Valve body material quality;
6. The low temperature valve must indicate the application temperature or indicate the control length;
7. Around valve pressure;
8. medium type and temperature range;
9. Whether in the electrically operated actuator to bring the spatial heater;
10. whether in the electrically operated actuator to have the over-load protection;
11. Whether or have other special requests.
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