What are the reasons why a hydraulic directional control valve does not function?

2009-04-02View Original

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The reasons why the hydraulic directional control valve does not change direction are as follows: 1) The suction force of the electromagnet is insufficient, and it is unable to move the spool； 2) The residual magnetism of the DC electromagnet is high, preventing the valve core from returning to its original position ； 3) The valve core is scratched and stuck inside the valve body ； 4) The axis of the centering spring is skewed, causing the valve spool to get stuck inside the valve ； 5) Due to poor machining accuracy of the valve core and valve body, a radial clamping force is generated, causing the valve core to get stuck ； 6) Severe oil contamination blocks the sliding clearance, causing the valve spool to get stuck.

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What are the reasons why a hydraulic directional control valve does not function?

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