Mga Karaniwang Fault at Mga Paraan ng Pag-aalis ng Directional Valve

2023-03-02
Hindi maganda ang epekto ng pamamasa o hindi wasto ang pamamasa;

Masyadong mabilis ang pagpasok ng electromagnet.

Paraan ng pag-aalis:

Ayusin o palitan ang elemento ng pamamasa;Ayusin ang bilis ng pagsipsip ng electromagnet. is faulty; The electromagnet cannot move or the coil is faulty; The control signal is not applied to the directional valve; The thrust of the electromagnet is too small.

Elimination method: overhaul the circuit; overhaul or replace the electromagnet coil; load the control signal; overhaul or replace.

(2) Fault phenomenon: abnormal movement of the spool (pilot solenoid valve fault).

Cause analysis: The spring is bent sideways; The valve core and the valve body are stuck.

Elimination method: Overhaul and replace the spring; Overhaul or replace the valve core and valve body.

(3) Fault phenomenon: abnormal movement of the spool (the spool is stuck).

Reason analysis: The gap between the valve core and the valve body is small; The machining accuracy of the valve core cannot meet the requirements.

Elimination method: Overhaul to make the fit gap meet the requirements; Improve the geometric accuracy of the valve core and valve body.

(4) Fault phenomenon: abnormal movement of the spool (hydraulic oil deterioration or oil temperature is too high).

Cause analysis: The viscosity of the hydraulic oil does not meet the requirements; There is colloid in the hydraulic oil; The parts are greatly deformed due to the increase of oil temperature.

Elimination methods: Replace the hydraulic oil that meets the requirements; Eliminate the cause of excessive oil temperature and filter the hydraulic oil; Avoid the hydraulic oil temperature exceeding the reasonable range.

hydraulic check valve

2. Fault phenomenon of insufficient spool flow: insufficient spool flow.

Reason analysis: The elastic coefficient of the spring is too small; The gap between the valve body and the valve core is too small to move relative to each other; The length of the push rod is small.

Elimination method: Replace the spring with the elastic coefficient that meets the requirements; Overhaul the gap between the valve core and the valve body to ensure normal relative movement between the two; Appropriately extend the length of the push rod.

3. The hydraulic control reversing valve is not easy to adjust the reversing speed Fault phenomenon: The hydraulic control reversing valve is not easy to adjust the reversing speed (the adjustment device is faulty).

Cause analysis: There is leakage; The type of throttle valve is not suitable; The processing accuracy of throttle valve is low.

Elimination method: Replace the seal and fasten the screws; Replace the triangular groove throttle valve; Replace the throttle valve with higher processing accuracy.

hydraulic valve types

4. Impact failure phenomenon: impact (commutation impact).

Cause analysis: The damping effect is not good or the damping is invalid; The electromagnet pulls in too fast.

Elimination method: Repair or replace the damping element; Adjust the suction speed of the electromagnet.


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