the working principle of pneumatic control valve, pneumatic - valve structure principle

pneumatic control valve is to air as power and cylinder as actuator, 4 ~ 20 ma signals as the drive, and by means of electric Industrial Valves positioner, converters, solenoid Industrial Valves, a valve such as attachments to drive the valve, the valve is a linear or equal percentage flow characteristics do adjust action, so as to achieve to the pipeline medium flow, pressure, temperature and other process parameters of the switch quantity or proportion type adjustment. Pneumatic - valve control with simple, quick response, and the advantages of intrinsically safe, and use in flammable and explosive occasions, don't need another explosion protection measures.

pneumatic - valve usually are connected by a pneumatic actuator and control valve installation and debugging of pneumatic actuators can be divided into single acting and double acting type two kinds, single-acting actuator with reset spring, and double-acting actuators is no return spring. Including single-acting actuator, loss of origin or sudden failure, automatic homing to the initial set up by the valve open or closed.

pneumatic - valve according to the form of action points gas open type and close type two kinds, namely the so-called normally open and normally closed, pneumatic control valve of gas or gas close, usually by positive and negative effects of the actuator and valve structure of different assembly way.

the working principle of the pneumatic control Industrial Valves ( Figure)

pneumatic - valve action:

gas type ( Normally closed type) Is when the film head air pressure increases, the valve to increase the opening direction of the movement, when to input pressure limit, the valve is in the fully open position. On the other hand, when the air pressure is reduced, the valve moves in the direction of closing, when no input air, the valve full close. Gu usually we call gas regulating valve type fault closed type valve.

type gas clearance ( Normally open type) Movement direction is just the reverse of gas drive type. When the air pressure increases, the direction of the valve to close actions; Air pressure decreases or not, or fully open valve to open direction. Gu usually we said gas regulating valve is open type valve failure.

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