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Ningbo Power Hydraulic Motor Co.,Ltd
Tel: 86-574-87193975
Fax: 86-574-23671688
Mobile: 86-18157449077
Add:No.588 Danshuihong Road, Cixi City, Ningbo, China

Check valve common breakdown and maintenance methods

Common faults are: valve cannot reverse or reversing slow, gas leaks, and solenoid pilot valves is faulty.

(1) check valve. directional valve cannot reverse, or reverse slow, usually due to poor lubrication, spring is stuck or damaged, oil or impurities stuck sliding parts and other causes. For this, you should check the Lubricator is functioning properly; the viscosity of the lubricant is appropriate. If necessary, you should replace the oil, clean the sliding parts of the valve, or replace the spring and valve.

(2) check valve. easy to occur after prolonged use, the valve spool seals wear, valve stems and valve seat damage, leading to gas leakage in valves, valve movement is slow or doesn't reverse faults. At this point, you should replace the sealing ring, valve stems and valve seat or valve replacement.

(3) if the solenoid pilot valves for inlet and outlet holes clogged with sludge and other debris, closed is not strict, active cores were jammed, circuit failure, may cause the valve to normal direction. 3 should be cleaned before the pilot valve and oil and impurities of the active core. Circuit fault generally can be divided into control circuit fault and solenoid failure categories. Check the circuit before the failure should be reversing valve hand knobs to turn a few, see if the rated pressure of the reversing valve in normal direction, if normal commutation, is a circuit fault. Check, available instruments measuring the electromagnetic coil voltage, see if reaches the rated voltage if voltage is too low, further checking the control circuits for power supply and the associated switch circuit. If no at nominal voltage reversing valve reversing properly, you should check the solenoid connector (plug) is loose or contact is not true. Method is to pull the plug, measure the resistance of the coil, if the resistance is too large or too small, note solenoid is damaged and should be replaced.