Failure Analysis and Elimination of Flow Control Valve
Classification:
Release Time：2017-08-04
1. adjust the throttle valve handle without flow change 1. The pressure compensation valve does not operate. The pressure compensation valve core is stuck in the closed position, the geometric accuracy of the valve core and the valve sleeve is poor, the gap is too small, the spring is bent and deformed laterally, and the valve core is stuck, and the spring is too weak. Elimination method: check the accuracy, repair the gap to meet the requirements, move flexible, replace the spring. 2. Throttle valve failure The oil is too dirty to block the throttle port, the assembly position of the handle and the throttle valve core is inappropriate, the connection on the throttle valve core is lost or the key is not installed, the throttle valve core is stuck due to too small matching clearance or deformation, and the thread of the adjusting rod is blocked by dirt, causing poor adjustment. Elimination method: check the oil quality
1. adjustment throttle handle no flow change
1. The pressure compensation valve does not operate
The pressure compensation spool is stuck in the closed position, the geometric accuracy of the spool and the valve sleeve is poor, the gap is too small, the spring is bent and deformed laterally, and the spool is stuck, and the spring is too weak.
Elimination:
Check the accuracy, repair the gap to meet the requirements, move flexibly, replace the spring.
2. Throttle valve fault
The oil is too dirty, the throttle port is blocked, the handle and the throttle core are not assembled properly, the connection on the throttle valve core is lost or the key is not installed, the throttle valve core is stuck due to too small matching clearance or deformation, The thread of the adjusting rod is blocked by dirt, resulting in poor adjustment
Elimination:
Check the oil quality and filter the oil; check the cause and reassemble; replace the key or refit the key; clean, repair the gap or replace the parts; disassemble and clean
3. The system is not supplied with oil
Reversing valve spool not reversing
Elimination:
Check the cause and eliminate
2. actuator movement speed is not stable (flow is not stable)
Pressure compensation valve failure; throttle valve failure; oil quality deterioration; check valve failure; pipeline vibration; leakage.
Elimination:
Repair to achieve flexible movement; Clean the damping hole and replace it if the oil is too dirty; Repair to achieve flexible movement; Replace the spring; Disassemble and clean, check the oil quality, and replace it if the oil quality is unqualified; For systems with large external load changes or requiring very stable movement speed of actuators, speed control valves should be used instead. Reduce the oil temperature and control it within the required range; Select materials with strong temperature sensitivity as compensation rods, the bad ones should be replaced; cleaning, checking the oil quality, unqualified ones should be replaced; grinding the one-way valve to improve the sealing performance; the air should be exhausted; after adjustment, lock with a locking device; eliminate leakage.
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