KCB gear pump high flow valve common faults and solutions
KCB gear pump high flow valve common faults and solutions
After KCB gear pump high flow valve installed , due to improper use , often resulting in many failures. These failures are not immediately removed if the safety valve will affect the role and life. Common faults are:
( 1 ) does not return after the discharge valve seat
This is mainly a spring bent stem , the valve installation caused by malposition or stuck . Should be re- assembled .
( 2 ) Leak
Under normal operating pressure equipment , exceed the allowable level of leakage between the valve and valve seat sealing surface. The reasons are : there is dirt between the valve and valve seat sealing surface. Can be used to enhance the wrench to open the valve a few times, rushed to the dirt ; sealing surface damage. Should be based on the extent of damage , using the method of grinding or milling turning to repair ; stem bending , tilt lever and fulcrum or skewed , so that the valve spool and dislocation . Should be re- fitted or replaced ; spring elasticity decrease or loss of elasticity . Should be taken to replace the spring , re-adjust the opening pressure and other measures.
( 3 ) not to open when a predetermined pressure
The reason for this situation is the constant pressure allowed . Or should readjust the position of the hammer spring compression ; valves and valve seat stick. Safety valve for manual should be regularly bleed or drain test ; lever safety valve lever is stuck or weights to be moved. Hammer should readjust the position of the lever moves freely make .
( 4) The exhaust back pressure continues to rise
This is mainly because the safety discharge valve displacement Xiaoping optional equipment , should be re- selection of the appropriate valve ; stem rust midline errors or spring , so that the valve is not open to the proper height , the stem should be re- assembled or replace the spring ; exhaust pipe cut have enough emissions should be taken to comply with the safety area of the exhaust pipe .
( 5 ) valve or vibration frequency hopping
Mainly due to the stiffness of the spring is too large . Should use appropriate spring stiffness ; adjustment ring to adjust properly, so that the pressure back seat is too high. Should re-adjust the position of the adjustment ring ; discharge piping resistance is too large, resulting in excessive emissions of backpressure. Should reduce the discharge piping resistance.
( 6 ) less than the required pressure to open
The main constant pressure allowed ; spring stretch aging decline . Tighten the screws should be properly adjusted or replaced spring .
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