When pneumatic single-seat regulating valve using a graphite asbestos packing, about three months should be on the packing to add a lubricating oil, to ensure that the regulator is flexible to use. 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 the control valve, in the inspection tour to check valve position indicator and it fits the regulator output; To have pneumatic single-seat regulating valve locator to regularly check gas source, found that the problem handled in time; Pneumatic single-seat regulating Industrial Valves should often keep health and various parts of the complete works. Pneumatic single-seat regulating valve common faults and reasons ( A) Pneumatic single-seat regulating valve is not action. Fault phenomenon and the reasons are as follows: 1. No signal, no air. (1) air not open; (2) due to the air source water freezes in winter, cause the clogging in duct blockage or filter, pressure reducing valve failure; (3) compressor fault; (4) air duct leakage. 2. Air supply, no signal. 1) regulator malfunction; (2) pipe leak signal; (3) locator corrugated pipe leakage; (4) adjust the retinal damage. 3. The locator without air. (1) filter clogging; (2) reducing valve fault; (3) pipe leakage or jam. 4. Locator has a gas source, no output. Locator orifice clogging. 5. There are signals, no action. (1) 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) The action of pneumatic single-seat regulating valve is not stable. Fault phenomenon and the reasons are as follows: 1. Air pressure is not stable. (1) compressor capacity is too small; (2) the pressure reducing valve failure. 2. Pressure signal is not stable. (1) the control system of time constant ( T = RC) Not appropriate; (2) the controller output is not stable. 3. Stable air pressure, pressure is stable signal, but the action of regulating 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 single-seat regulating valve vibration. Fault phenomenon and the reasons are as follows: 1. Regulating valve in He Kaidu under vibration. (1) to support the instability; (2) there is vibration source near; (3) the valve core and bushing wear. 2. Regulating valve in full close position near the end of the vibration. (1) the regulator 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) Pneumatic single-seat regulating valve action is slow. The dull phenomenon and the reason is as follows: 1. 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. 2. 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 regulator can also lead to action. ( 5) Pneumatic single-seat regulating valve leakage increase. The reason of leakage is as follows: 1. leakage when fitted. In (1) valve core is frayed, severe leakage, (2) Industrial Valves set off is lax. 2. 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) Smaller flow adjustable range. The main reason is that the valve core is smaller corrosion, so that the minimum flow of adjustable. Pneumatic control valve fault phenomenon and reason, can suit the action to solve.
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