Structure and composition
Valve body: usually cylindrical, the material can be cast iron, cast steel, stainless steel, etc., to meet the needs of different media.
Valve plate (butterfly plate) : disc-like structure, flow control through rotation, material to resist medium corrosion (such as stainless steel, PTFE coating).
Valve stem: Connects actuator to valve plate, transfers torque, requires high strength and wear resistance.
Sealing ring: Rubber (EPDM, NBR) or metal hard seal is commonly used for the seat to ensure the tightness when closed.
Pneumatic actuators: including cylinders, pistons, springs, etc., convert air pressure into mechanical motion, optional single action (spring return) or double action (bidirectional air control).
the working principle
Control signal: Receive 4-20mA electrical signal or switching signal, and the pneumatic positioner converts the signal into a pressure change (usually 0.2-1.0mpa).
Driving process: compressed air drives the piston movement, drives the valve stem to rotate, and the valve plate is from 0° (fully closed) to 90° (fully open), adjusting the Angle to achieve flow control.
Type:
Switch type: two-position control (full open/full closed), suitable for simple open and close scenes.
Adjustable type: equipped with positioner, can accurately control the opening, for continuous adjustment system.
Core advantage
Fast response: Pneumatic drive action time is short (usually only a few seconds), suitable for high frequency operation.
High reliability: simple structure, low failure rate, suitable for explosion-proof environment (no spark risk).
Easy maintenance: Modular design, easy to disassemble and replace seals or valve plates.
Energy saving and environmental protection: Compared with electric valves, low energy consumption and no leakage risk.
1) foam packing inside,one carton box outside
2) then put all carton box in one strong plywood case for sea transport
Port of departure: Shanghai, China
Lead Time:
| Quantity(Units) |
1-50 |
51-1000 |
1001-10000 |
>10001 |
| Est. Time(days) |
Goods in stock |
7 |
20 |
To be negotiated |
Audited Supplier 
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