For the hydraulic system, all kinds of pressure control valves show high similarity in structure and operation principle.

In the process of applying the flow control valve, the flow control valve can realize the centralized control of the flow problem of the hydraulic system, and can also complete the control and management of the operating speed of the actuator. Combined with experience, the flow control valve needs to meet certain pressure conditions to achieve the desired effect. During use, the hydraulic flow is controlled by adjusting the size of the orifice.

Unlike other hydraulic control valve types, flow valves fail more frequently during operation. The main reason is that the size of the orifice is relatively small, the cleanliness of the hydraulic oil is relatively strict, and the tightness of the hydraulic system must be guaranteed during use to ensure the quality of the application. However, it should be noted that in the process of adjusting the handle, the flow rate of the relief valve port is difficult to change, so the operating speed of the actuator cannot be adjusted in time.

Common flow valve failure problems and repair methods are as follows:

1 When there are burrs or oil contaminants in the throttle spool, it will directly cause the spool to be stuck. At this time, the operator should clean up the burr of the valve core to ensure the running performance of the throttle valve core; or replace the hydraulic oil to ensure the cleanliness of the throttle valve core.

2. The tolerance of the valve core and the valve body hole exceeds the limit value, which is easy to cause the throttle valve adjustment failure phenomenon. At this time, the operator needs to grind the valve hole facility in time. If necessary, reconfigure the spool.

3. If the equipment is not used for a long time, it will directly cause the valve core to rust. At this time, the operator should clean the valve core in time and reuse it after cleaning.

4. The hydraulic system flow valve needs to adjust the flow valve handle based on pressure relief, which needs to be dealt with according to the actual situation, as follows:

①The flow is not stable enough.

The oil may be used without strict filtration treatment, and impurities may accumulate in the oil, which will affect the flow area. Given this situation, it is recommended that the operator strengthen the oil filtration treatment to enhance the cleanliness of the oil.

②The oil temperature rises.

There may be pressure loss when the oil passes through the throttling gap, which will directly cause the oil temperature to rise under long-term action. When such problems occur, it is easy to precipitate impurities such as colloids and asphalt during the oil deterioration process. It is recommended that the operator clean the orifice in time.

③Leakage

Excessive internal and external leakage of the flow valve will lead to unstable flow, resulting in the unpredictable pressure feedback effect. In addition, the reverse connection of the oil port and the lack of pressure compensation feedback of the flow valve will cause the wrong spring installation or the leakage of the pressure-reducing valve.