pneumatic - valve to control is simple, quick response, and intrinsically safe, don't need another characteristics of explosion protection measures, is widely used in various industries of petroleum, chemical, electric power, metallurgy and other industrial enterprises widely used. We have to attach importance to its life, how to make it longer? The daily inspection and maintenance is necessary. Meet the new European valve manufacturer to introduce the pneumatic - valve inspection and maintenance work.

the pneumatic control valve using a graphite asbestos packing, about three months should be on the packing to add a lubricating oil, to ensure the flexible pneumatic - valve works. If found that packing pressure cap pressure very low, should complement packing, such as ptfe found dry packing hardening, should change in time; Should pay attention to the operation of pneumatic control valve in the circuit check, check the valve position indicator and it fits the regulator output; Frequent checks of your have pneumatic - valve locator to gas source, found that the problem handled in time; Should maintain frequent health and pneumatic control valve components complete works. The common malfunction and reasons: (pneumatic control valve A) No signal, no air. Gas source is not open, paying due to air water freezes in winter, cause the clogging in duct blockage or filter, pressure reducing valve failure, (3) compressor fault; (4) air duct leakage. Air supply, no signal. 1) regulator malfunction, (2) pipe leak signal; (3) locator corrugated pipe leakage; (4) adjust the retinal damage. The locator without air. (1) filter clogging; (2) reducing valve fault I (3) pipe leakage or jam. Locator has a gas source, no output. Locator orifice clogging. There are signals, no action. (1) the valve core loss, (2) the valve core and the social or stuck with the valve seat; (3) stem bend or break; (4) seat valve core to freeze or focal piece of dirt; (5) spring actuator due to long-term need not rust. ( 2) Air pressure is not stable. (1) compressor capacity is too small; (2) the pressure reducing valve failure. Pressure signal is not stable. (1) the control system of time constant ( T＝RC） Not appropriate; (2) the controller output is not stable. Stable air pressure, pressure is stable signal, but the action of pneumatic control valve is still unstable. (1) the locator produets amplifier of ball valve and the dirt of lax, special gas consumption increase would produce output volatility; (2) locator nozzle baffle amplifier of parallel, shutter not nozzle; (3) the output pipe, line leak; (4) actuators rigidity is too small; (5) motion of the valve stem friction resistance is big, with the contact parts are blocking phenomenon. ( 3) Pneumatic control valve in He Kaidu under vibration. (1) to support the instability; (2) there is vibration source near; (3) the valve core and bushing wear. The pneumatic - valve full close position near the end of the vibration. 1) pneumatic - valve to choose large, often used in the small open degrees; (2) the flow direction of medium single-seat valve to close in the opposite direction. ( 4) The valve stem in one direction only slow action. 1) pneumatic diaphragm actuator of the diaphragm leakage; (2) actuators in the 'O' type seal leakage. The valve stem have dull phenomenon in the reciprocating motion. (1) the body with sticky content block; (2) a asbestos packing ptfe or graphite packing metamorphic sclerosis lubricating oil dry; (3) packing too tight, the friction resistance increases; (4) frictional resistance due to the valve stem is not straight; 5. No locator pneumatic pneumatic regulator can also lead to action. ( 5) leakage when fitted. In (1) valve core is frayed, severe leakage, (2) valve set off is lax. The short of full closed position. (1) the medium pressure difference is too big, small rigidity, actuator valve closed lax; (2) valve with foreign body; (3) bushing sintering. ( 6) Flow adjustable range smaller corrosion main reason is that the Industrial Valves core is smaller, so that the minimum flow of adjustable.

keywords: pneumatic - valve pneumatic control valve fault inspection pneumatic - valve repair items
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