How Fisher Pneumatic Control Valves Work:
Pneumatic control valve is usually composed of pneumatic actuator and control valve connection, installation and commissioning, pneumatic actuator can be divided into single-acting and double-acting two-acting, single-acting actuator has a return spring, and double-acting actuator has no return spring. The single-acting actuator can automatically return to the open or closed state initially set by the valve when there is no air supply or failure. Pneumatic control valve is divided into two types according to the form of action: air opening type and air closing type, that is, the so-called normally open type and normally closed type, and the air opening or air closing of the pneumatic control valve is usually realized by the positive and negative action of the actuator and the different assembly methods of the valve state structure.
Fisher Pneumatic Control Valve Mode of Action:
Air open type (normally closed type) is when the air pressure on the membrane head increases, the valve acts in the direction of increasing the opening, and when the upper limit of the input air pressure is reached, the valve is in a fully open state. Conversely, when the air pressure decreases, the valve moves in the direction of closing, and when no air is being fed, the valve is fully closed. Usually, we call an air-open control valve a fault-closing valve.
The air-closed type (normally open type) moves in the opposite direction to the air-open type. When the air pressure increases, the valve acts in the direction of closing; When the air pressure decreases or is absent, the valve is open or fully open. As a rule, we call an air-closed control valve a fault-opening valve.
Fisher Pneumatic Control Valve Installation Principles
1. The installation position of the pneumatic control valve requires a certain height from the ground, and a certain space should be left up and down the valve to facilitate the disassembly, assembly and repair of the valve. For control valves equipped with pneumatic valve positioners and handwheels, it must be easy to operate, observe and adjust.
2. The regulating valve should be installed on the horizontal pipeline, and perpendicular to the pipeline up and down, and generally supported under the valve to ensure stability and reliability. For special occasions, when the control valve needs to be installed horizontally on a vertical pipe, the control valve should also be supported (except for small diameter control valves). Install it in such a way as to avoid additional stress on the control valve).
3. The working environment temperature of the control valve should be (-30-+60), and the relative humidity should not be more than 95%.
4. There should be a straight pipe section at the front and rear positions of the control valve, and the length should not be less than 10 times the pipe diameter (10D), so as to avoid the straight pipe section of the valve being too short and affecting the flow characteristics.
5. When the caliber of the regulating valve is not the same as the process pipeline, it should be connected by reducer. In the installation of small bore control valves, threaded connections are available. The fluid direction arrow on the valve body should be consistent with the fluid direction.
6. Set up a bypass pipeline. The aim is to facilitate changeover or manual operation, and to allow the control valve to be serviced without stopping.
7. Before installation, the control valve should be completely removed from foreign objects in the pipeline, such as dirt and welding slag
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