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Pneumatic cut-off valve and pneumatic control valve difference
Dec 04, 2017

Pneumatic valve is a control device driven by compressed air. Due to its high reliability, fast switching speed, intrinsically safe and explosion-proof, it is widely used in gas, steam, liquid and other media without special treatment. Pneumatic valve is equipped with different related accessories, switches can be realized and intelligent adjustment-type two functions! For these two different forms of control valve, the use of the place is not the same, can not be confused.

Pneumatic cut-off valve is mainly a pipeline medium to open and close the role of the main valve position is open and closed position, generally used in urgent need for action position, common for the pipeline in the normally open state, the rapid closure of an emergency situation! The pneumatic control valve position without restrictions, and the positioning device, input 4 ~ 20mADC signal and gas source can control the operation, pressure, flow, temperature, liquid level and other parameters of the regulation!

Pneumatic cut-off valve and pneumatic control valve difference:

1, the pneumatic valve, including the control valve and the shut-off valve, the role of the two forms are not the same, although the flow control valve can be adjusted to 0, but the shut-off valve is generally used for emergency shut-off, with the valve positioner, usually the cylinder valve . The control valve is with pneumatic film, the kind of big disc, in addition to adjust, but also can cut off, the only difference between the two is that the gas-powered.

2, the pneumatic cut-off valve is either fully open or closed, more for protection; and pneumatic control valve can switch in any position, to control the valve to stay at a specified opening, you can adjust the flow or pressure. Pneumatic shut-off valve is used to turn off the media pipeline, requiring faster action, turn off the sealing is better, the leak level to reach one hundred thousandth.

3, pneumatic control valve is mainly used for continuous control, signal and valve stroke corresponding with electrical valve positioner to receive the control model, according to continuous 4-20MA signal changes, the control valve to complete 0-100% of the entire trip action.

4, Pneumatic cut-off valve only open and close two positions, generally with a reversing solenoid valve and travel switch, solenoid valve used to switch the direction of pneumatic actuator, travel switch to feedback signal to the control system, real-time understanding of the valve position switch status. Pneumatic control valve can be closed when there is a certain amount of leakage, pneumatic cut-off valve is required to zero or close to zero.