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Working principle of pneumatic control valve

Update:13 May 2022
Summary:

Installation principle of pneumatic control valve: (1) […]

Installation principle of pneumatic control valve:
(1) The installation position of the pneumatic control valve is required to have a certain height from the ground, and there must be a certain space above and below the valve to facilitate the disassembly and repair of the valve. For regulating 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 the upper and lower sides should be perpendicular to the pipeline. Generally, it should be supported under the valve to ensure stability and reliability. For special occasions, when the regulating valve needs to be installed horizontally on a vertical pipeline, the regulating valve should also be supported (except for the small-diameter regulating valve). When installing, avoid adding additional stress to the regulating valve).
(3) The working environment temperature of the control valve should be within (-30~+60) and the relative humidity should not exceed 95%.
(4) There should be a straight pipe section at the front and rear of the regulating 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 diameter of the regulating valve is not the same as that of the process pipeline, it should be connected with a reducer. Threaded connections can be used when installing small-diameter control valves. The fluid direction arrow on the valve body should be consistent with the fluid direction.
(6) To set up a bypass pipe. The purpose is to facilitate switching or manual operation, and the control valve can be repaired without stopping.
(7) Before installing the regulating valve, thoroughly remove foreign matter in the pipeline, such as dirt, welding slag, etc.
working principle:
Pneumatic control valve is to use compressed air as the power source, the cylinder as the actuator, and with the help of electrical valve positioner, converter, solenoid valve, retaining valve and other accessories to drive the valve, to achieve switching or proportional adjustment, receiving industrial The control signal of the automatic control system is used to adjust the pipeline medium: flow, pressure, temperature and other process parameters. Pneumatic control valve is characterized by simple control, fast response, and intrinsic safety, without the need for additional explosion-proof measures.
Precautions for storage, installation and use
1. The valve should be stored in a dry room, and both ends of the passage must be blocked. Not allowed to be stacked
2. The regulating valve stored for a long time should be checked regularly to remove dirt, and anti-rust oil should be applied to each moving part and processing surface to prevent rust.
3. The valve should be installed on the horizontal pipeline, and must be installed vertically. Stem up.
4. It is required to install according to the flow direction of the medium indicated by the arrow in the figure

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