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Pneumatic Control Valve Routine Maintenance and Fault Analysis
Pneumatic valve performance will have a direct impact on the quality of the entire regulatory system. As the pneumatic control valve on the scene is in direct contact with the media being adjusted, the working environment is very poor, so easy to produce a variety of failures. In the production process, in addition to ruled out these failures at any time, but also must be regular maintenance and regular maintenance. Especially for the use of particularly harsh environment control valve, but should pay attention to maintenance and regular maintenance. Therefore, the installation of pneumatic control valve should pay attention to the following aspects: 1. Pneumatic control valve routine maintenance: When the control valve graphite - asbestos as filler, about three months should be added to the filler on a lubricant to ensure that regulation Valve easy to use. If it is found that packing under pressure is very low, it should be filled with packing. If PTFE packing is found to be hardened, it should be promptly replaced. Attention should be paid to the operation of regulating valve during the inspection and check the valve position indicator and regulator output Is consistent; on the positioner valve to always check the gas source and found the problem in a timely manner; should always maintain the health of the valve and the various components of a complete and easy to use. 2. Common faults and causes: (1) control valve does not move. Symptoms and causes are as follows: a. No signal, no air: ①gas source is not open. ② As the source of water in the winter icy water, leading to blocked or filter duct, pressure regulator plug failure. ③ compressor failure. Gas source leak. b. Air source, no signal: ①regulator failure. ② signal tube leakage. ③ locator bellows leak. ④ adjust the omentum damage. c. Locator without air: ①filter plugged. ② pressure regulator failure. ③ pipeline leakage or blockage. d. Locator gas source, no output: Locator throttle plug. e. There is signal, no action: ①spool off, ② spool and seat stuck. ③ stem bent or broken. ④ seat valve block frozen or coke dirt. ⑤ actuator springs due to long-term useless rust. (2) the action of regulating valve is unstable, the symptom of the trouble and the reason are as follows: a. The pressure of the air source is unstable: The compressor capacity is too small. ② pressure regulator failure. b. Signal pressure instability: ①The time constant of the control system (T = RC) is not appropriate. ② regulator output is unstable. c. Gas pressure stability, the signal pressure is stable, but the control valve action is still unstable: ①locator amplifier ball valve dirt worn off is not strict, the gas consumption will increase when the output shock. ② locator amplifier nozzle baffle is not parallel, baffle cover nozzle. ③ output pipe, line leakage. ④ actuator rigidity is too small. ⑤ Stem movement in the friction resistance, contact with the block there is a phenomenon.