The solution to the pressure fluctuation of the pressure reducing valve- Ningbo Hengmin Lingtong Pneumatics Components & Set Co., Ltd.

(1) Failure phenomenon

The pressure after the pressure-reducing valve fluctuates greatly.

(2) Cause of failure

1. The minimum value of the pressure before the pressure reducing valve is lower than the pressure value after the pressure reducing valve.

2. The load of the actuator is unstable. In the hydraulic cylinder pressure reducing circuit, the pressure before and after the pressure reducing valve can maintain a stable value only under the premise that the actuator has sufficient load. That is, when the load is lower than the setting value of the pressure reducing valve, the pressure value after the pressure reducing valve changes with the load.

3. Internal and external leakage of hydraulic cylinder.

4. Hydraulic oil pollution causes unstable action of the pressure reducing valve or failure of the pressure reducing valve itself. If the main spool of the pressure reducing valve is stuck due to stolen goods, the pressure behind the valve will be higher or lower than the set value; if the pilot poppet valve and the valve seat are not tightly closed, the pressure after the valve will be lower than the set value. value.

(3) Troubleshooting

1. When the pressure of the main oil circuit is lower than the minimum set pressure of the pressure reducing valve, a check valve should be added before the pressure reducing valve, and an accumulator should be added between the check valve and the pressure reducing valve.

2. Replace the seals at the leakage of the hydraulic cylinder.

3. Regularly check whether the hydraulic oil has deteriorated, and replace the deteriorated hydraulic oil in time.

Large flow pressure reducing valve