Working principle of pneumatic control valve

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 must be left above and below the valve to facilitate disassembly and repair of the valve. For the control valve equipped with pneumatic valve positioner and handwheel, it must be easy to operate, observe and adjust. (2) The regulating valve should be installed on the horizontal pipeline, and it should be vertical to the pipeline. It should be supported under the valve to ensure stability and reliability. For special occasions, when the regulator valve needs to be installed horizontally on a vertical pipeline, the regulator valve should also be supported (except for small-diameter regulator valves). When installing, avoid adding additional stress to the regulating valve). (3) The working environment temperature of the regulating valve should be (-30 ~ + 60) Relative humidity is not more than 95% 95%, relative humidity is not more than 95%. (4) There should be a straight pipe section at the front and back of the regulating valve, and the length of the pipe should not be less than 10 times the pipe diameter (10D) to avoid the valve's straight pipe section 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 with a reducer. When installing small-diameter regulating valves, threaded connections are available. The flow direction arrow on the valve body should be consistent with the flow direction. (6) Bypass pipes should be installed. The purpose is to facilitate switching or manual operation, and the maintenance of the regulating valve can be performed without stopping. (7) Before installing the regulating valve, thoroughly remove the foreign objects in the pipeline, such as dirt and welding slag. Working principle: The pneumatic control valve uses compressed air as the power source and the cylinder as the actuator, and drives the valve with the help of electrical valve positioners, converters, solenoid valves, position-keeping valves and other accessories to achieve switching or proportional adjustment , Receive control signals of industrial automation control system to complete the adjustment of pipeline media: flow, pressure, temperature and other process parameters. The characteristics of the pneumatic control valve are simple control, fast response, and intrinsic safety, and no additional explosion-proof measures are required. 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. Stacking is not allowed. 2. The long-term storage control valve should be regularly checked to remove dirt, and the moving parts and processing surfaces should be coated with anti-rust oil to prevent rust. 3. The valve should be installed on a horizontal pipeline, and must be installed vertically. The stem is up. 4. Compulsory installation is carried out according to the direction of the medium flow indicated by the arrow in the figure.

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