Check valve failure generally have: gem ball or plastic gasket contaminated lead to bad sealing, performance for system pressure fluctuations. cannot reversing or reversing slow, gas leak, such as electromagnetic pilot valve has some problem. ( 1) Gem ball or plastic pads contaminated lead to bad sealing. The measures should be taken: step 1: a. Open the drain valve, isopropyl alcohol as the mobile phase iv. b。 Remove the check valve, in isopropyl alcohol, ultrasonic cleaning. Measure 2: remove the check valve, in a beaker containing acetone ultrasonic cleaning. ( 2) Reversing valve cannot reversing or reversing slow, usually because of bad lubrication, spring stuck or damage, oil or impurity sticking sliding part and other causes. To this, should first check of oil mist is normal; The viscosity of the lubricating oil. When necessary, should replace lubricating oil, cleaning sliding part of the directional control Industrial Valves, or replace spring and directional control valve. ( 3) Directional control valve is seen after long time use the sealing ring wear, the valve stem and valve core seat damage phenomenon, lead to gas leakage in the valve, valve slow or can't normal commutation failure, etc. At this point, a seal, valve stem and seat should be replaced, or will the reversing valve. ( 4) If electromagnetic pilot Industrial Valves inlet and vent was sludge and other debris jam, closed lax, activity core was jammed, a fault circuit, etc. , all can lead to directional valve can't normal commutation. The former three kinds of activities should be cleaning pilot valve and core on the sludge and impurities. And circuit fault generally divided into two groups: the control circuit fault and electromagnetic coil. Before checking circuit fault, should be the reversing valve manual knob turn a few times, see if the reversing Industrial Valves under the rated pressure can normal commutation, if can normal commutation, circuit is defective. Check, instrument measuring electromagnetic coil voltage are available, and see if the rated voltage, if the voltage is too low, should further check the control circuit of the power supply circuit and associated travel switch. If under the rated voltage directional valve can't normal commutation, should check the joint of electromagnetic coil ( Plug) Whether loose or exposure to false. Method is to remove the plug, measuring coil resistance, if the value is too big or too small, and explain the electromagnetic coil is damaged, should be replaced.
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