Failure Analysis of the reasons for the elimination of the method (A) to adjust the throttle valve handle no flow changes 1 pressure compensation valve does not act as a pressure compensation valve stuck in the closed position 1) spool and valve sleeve poor geometric accuracy, the gap is too small 2) The spring is bent sideways, the valve core is deformed and stuck 3) the spring is too weak 1) check the accuracy, repair the gap to meet the requirements, flexible movement 2) replace the spring 3) replace the spring 2 throttle fault (1) , So that the throttle blocked (2) Handle and throttle valve assembly location is not appropriate (3) Throttle valve spool connection is missing or not installed (4) Throttle valve spool with the gap is too small or deformed (5) Adjusting rod thread blocked by dirt, resulting in poor regulation (1) Check the oil quality, filter the oil (2) Check the reason, reassemble (3) Replace the key or refill keys (4) Clearance or replacement parts (5) Open the cleaning 3. The system does not supply the valve spool is not reversed Check the reasons and eliminate the (B) of the actuator speed instability (flow instability) 1. Pressure compensation valve failure Pressure compensation valve spool insecure 1) valve There is a stuck phenomenon 2) compensating valve damping holes when blocked 3) the spring side bending, deformation, or spring end and the spring axis is not vertical (2) pressure compensation valve spool stuck in the fully open position 1) 2) Check valves and valve sleeve geometrical accuracy is poor, with the gap is too small 3) The spring side bending, deformation and the spool stuck 1) Repair, to move flexible 2) Wash the orifice, if Replace the spring 1) Clean the orifice, if the fluid is too dirty, it should be replaced 2) Repair to move flexible 3) Change the spring 2) Throttle valve malfunction (1) (2) Simple throttle valve changes in load will cause flow changes (1) Open the clean, check the oil, if the oil should be replaced by substandard (2) Changes in the external load or requirements The actuator speed is very smooth system, the valve should be used instead of 3. The oil quality deterioration (1) the oil temperature is too high, resulting in changes in the flow through the throttle (2) compensation valve with temperature compensation valve Sensitivity is poor, damaged (3) oil is too dirty, blocked Dead orifice or orifice (1) Check the temperature rise, reduce the oil temperature and control within the required range (2) Selection of temperature-sensitive materials to compensate rod, bad should be replaced (3) Cleaning, inspection Oil, unqualified should be replaced 4. Check valve failure In the flow control valve with one-way valve, the one-way valve sealing is not good Grinding one-way valve to improve the sealing 5. Pipeline vibration (1) System In the air (2) due to the vibration of the pipeline to adjust the location of the change (1) the air should be discharged to the net (2) after adjustment with a locking device 6 leak leakage and leakage flow instability, resulting Uneven operation of the actuator speed to eliminate leakage, or replace the component failure phenomenon analysis (1) adjust the throttle handle flow-free 1. pressure compensation valve does not operate pressure compensation valve stuck in the closed position 1) spool And the valve sleeve poor geometric accuracy, the gap is too small 2) the spring side bending, deformation and the spool stuck 3) the spring is too weak 1) check the accuracy of repair clearance to meet the requirements of mobile and flexible 2) replace the spring 3) replace the spring 2 Throttle failure (1) Fluid Dirty, so that the throttle blocked (2) Handle and throttle valve assembly location is not appropriate (3) Throttle valve spool connection is missing or not installed (4) Throttle valve spool due to the gap with the small or deformed And stuck (5) Adjusting rod thread was blocked by dirt, resulting in poor regulation (1) Check the oil quality, oil filtration (2) Check the reason, reassemble (3) Repair the gap or replacement parts (5) open the clean 3. The system is not oil valve spool is not reversed to check the cause and eliminate (b) the actuator speed is not stable (flow instability) 1. Pressure compensation valve failure 1) The valve core of pressure compensation valve is insensitive 1) The valve core is jammed 2) The valve damping orifice is plugged 3) The side of the spring is bent or deformed, or the spring end is not perpendicular to the spring axis (2) Pressure compensation valve spool in the fully open position stuck 1) compensation valve damping holes blocked 2) spool and valve sleeve geometry accuracy is poor, with the gap is too small 3) the spring side bending, deformation and the spool stuck 1) repair, to move flexible 2) clean the orifice, if the oil over Should be replaced 3) replace the spring 1) to clean the orifice, if the oil is too dirty, it should be replaced 2) repair to move flexible 3) replace the spring 2 throttle fault (1) (2) Simplified throttle change will cause changes in flow load (1) Open the clean, check the oil, if the oil should be replaced by substandard (2) changes in external load or require the implementation of the movement speed Very smooth system, should use the governor valve 3. Oil quality deterioration (1) the oil temperature is too high, resulting in changes in the flow through the throttle port (2) compensation valve with temperature compensation valve sensitivity is poor, has Damaged (3) oil is too dirty, blocking the orifice or orifice (1) check the temperature rise, reduce the oil temperature and control within the required range (2) the choice of temperature-sensitive material compensation rod, Bad should be replaced (3) cleaning, inspection of oil, unqualified should be replaced 4. Check valve failure Flow control valve with check valve, one-way valve sealing is not good Grinding one-way valve to improve sealing 5. Vibrations in the pipeline (1) Air in the system (2) Vibration due to the pipe (1) The air should be drained (2) After adjustment, the locking device is locked 6. Leakage Leakage and leakage Unstable flow rate, resulting in uneven execution of the work element Leakage, Or replace the component