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Check valve failure treatment

Check valve check valve or check valve. Used to prevent the reverse flow of oil flow in a hydraulic system, or to prevent the reverse flow of compressed air in pneumatic systems.

Check valves are available in both straight and at right angles. Straight-through valves with threaded connections installed on the pipeline. Right angle type valves have threaded connection, plate connection and flange connections in three forms. Hydraulic control valves also known as closed valves or pressure maintaining valve, it is with the same one-way valves to prevent reverse flow of oil. But need oil in the hydraulic circuit flows reverse flow may also be used to control oil pressure, open the check valve so oil can flow in both directions. Pilot controlled check valve cone disc, good sealing performance. When the closed circuit is requested, this valve is available as a one-way locking up oil pressure. Fluid control valves control how the oil spill has leaked and leaked two. Export reverse in oil-no back pressure in the oil pipeline leak that can otherwise required outflow to lower control pressure.

Check valve failure: gem ball contamination leads to bad seals or plastic gaskets, performance for system pressure fluctuations. Valve cannot reverse or reversing slow, gas leaks, and solenoid pilot valves is faulty.

Gem ball or plastic gaskets contamination leads to bad seal. The measures to be taken: measures 1:a. open the drain valve, with isopropanol mobile phase IV. b. remove check valve, placed in isopropyl alcohol, ultrasonic cleaning. Step 2: remove the one-way valve, into a beaker of acetone and ultrasonic cleaning.

Reversing 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, change the oil, clean the sliding parts or replacement of the valve spring and 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. 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.