What Are The Causes of Abnormal Pressure in Hydraulic Cylinders

The causes of abnormal pressure include those related to hydraulic pumps and motors. The reasons for the hydraulic cylinder control valve. During operation, if it is found that the pressure cannot be raised or lowered, it is very likely that the directional control valve is malfunctioning, causing the system to continuously unload or maintain high pressure.

Blockage of the damping hole of the relief valve, burrs on the main valve core, and dirt in the valve core, valve hole and gap may all cause the main valve core to be stuck in the fully open position. The hydraulic oil output by the hydraulic pump directly returns to the oil tank through the relief valve, that is, the pressure oil circuit and the return oil circuit are short-circuited, resulting in no pressure in the system.

There are also other reasons. For instance, if the oil level in the hydraulic cylinder is too low, the suction pipe is too thin, or the suction filter is clogged with impurities and dirt, it will cause excessive suction resistance of the hydraulic pump, resulting in insufficient system flow and low pressure. In addition, if the return oil pipe is on the liquid surface or the suction oil pipe is poorly sealed and leaks air, it is easy for air to mix into the system, resulting in unstable system pressure.