Pneumatic valve is one of the kerosene and chemical companies universal operation of the instrument. It roughly distorted to work hard to ensure the installation of deformity operation and insurance Provisional dice mean. Therefore, to enhance the maintenance of pneumatic control valve is necessary. First, check the focus View parts to see the body wall: In the low pressure differential and the media with the occasion of the victory, the valve body wall, estuary valve gap repeatedly subject to media impact and success, we must focus on pressure decay; check Valve seat: due to work medium infiltration, static seat with the thread inside and outside susceptible to the victory and the seat slack; view spool: valve is one of the movable parts conditioning valve, the more media erosion Tension, the burden of inspection is responsible for checking whether the various parts of the valve spool can be successful, wear, curiosity is in the case of low pressure drop, spool wear cavitation caused by cavitation more intense scene. Loose tension of the spool should be replaced; Check the seal packing: Check the packing asbestos rope can be dry, such as the refusal of PTFE packing, should be able to see if the aging and the mating surface can be relaxed; Check the implementation of the rubber Whether the film can be aged or cracked. Second, the pneumatic custody with the custody of the valve When the conditioning valve rejected graphite 1 asbestos filler, it may be three months should be added to the filler on a smooth oil, to ensure the flexible use of conditioning valve. If you create packing pressure cap pressure is very low, you should compensate the packing, such as the creation of polytetrafluoroethylene dry stuffing softening, should be replaced in real time; should be careful to check the operation of the valve in the tour view, check valve position indicator and conditioner The output can be met; the regulator valve to check the gas source often repeatedly, creating problems in real-time disposal; should always insist on conditioning valve health and the various parts of the broken easy to use. Third, the common cause of persuade and nurture (1) conditioning valve is not a move. Dissuade the scene and the reasons are as follows: 1. No signal, no air source. ①gas source is not open, ② due to air source water in the summer icing, resulting in duct blockage or filter, pressure regulator plug failure, ③ expander to discourage; ④ gas source leakage. 2. A gas source, no signal. ①conditioner discouraged, ② signal leakage tube; ③ locator floating tube leaks; conditioning mesh membrane relaxation. three. Locator airless. ①filter blockage; ② valve to prevent I ③ leakage or blockage of the pipeline. 4. Locator gas source, no output. The throttle of the positioner is blocked. 5. A signal, no action. ①spool off, ② spool and the community or with the seat stuck; ③ stem straight or broken; ④ valve spool frozen or coke dirt; ⑤ actuator spring is not necessary and rust died. (B) conditioning valve moves do not fluctuate. Dissuade the scene and the reasons are as follows: 1. Air pressure does not fluctuate. ①expander capacity is too small; ② valve discouraged. 2. Signal pressure does not fluctuate. ①regulatory system, the annual constant (T = RC) is not appropriate; ② regulator output does not fluctuate. three. Air pressure fluctuations, signal pressure fluctuations, but conditioning valve moves are still not volatile. ①locator amplifier ball valve worn by the dirt is not strict, when the amount of consumption increases unexpectedly will produce vibration output; ② amplifier amplifier nozzle baffle does not obey, baffle cover nozzle; ③ Output pipe, line leakage; ④ actuator rigidity is too small; ⑤ valve stem flow difficult to ask questions, with the phase Bingge site has opened the scene. (C) conditioning valve vibration. Dissuade the scene and the reasons are as follows: 1. The regulator valve vibrates at any opening. ①unsteady support; ② around the vibration source; ③ valve core and bush wear tension. 2. Conditioning valve in the verge of fully closed position vibration. ①large selection of conditioning valve, often operating in a small opening; ② single-seat valve medium flow and closure of favoritism similar. (D) conditioning valve slow move. The slow scene and the reason are as follows: 1. The stem is only slow when bi-directional. ①Pneumatic diaphragm actuator broken in the membrane breakage; ② actuator "O" -type leak. 2. Stem in the reciprocal move have slow scene. (1) blockage of viscous substance in valve body; (2) deterioration of PTFE packing or softening of graphite or asbestos packing graphite oil; (3) filler plus too tight, difficult to ask resistance increase; (4) ⑤ pneumatic regulator without a positioner will lead to slow action. (5) leakage of the regulator valve increases. The reasons for leakage are as follows: 1. Leakage when the valve is closed. ①spool is worn, leak tight, ② valve not adjusted off is not strict. 2. Valve can not reach the fully closed position. ①medium pressure is too large, the actuator rigidity is small, the valve is not strict; ② valve foreign body; ③ bushing sintering. (6) the flow rate adjustment 畛 domain smaller. The secondary reason is that the spool is agitated to become smaller so that the minimum adjustable flow rate is increased. Understand the pneumatic conditioning valve to persuade the scene and the reason, probably symptomatic dismissed the pace to be managed. This article is provided by Shanghai Yiyi Precision Valve Co., Ltd. Contact: Mr. Lin For more information, please visit our shop in Asia Pump Network :?