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What causes the oil leakage of the control valve of the four-column hydraulic press

by:WORLD     2022-11-01
During the processing of the control valve of the four-column hydraulic press, if the coaxiality and chamfering requirements specified in the design drawings are not met, it will cause oil leakage. The coaxiality of the O-ring groove of the valve body to the valve body hole is specified as 0.03mm, which is not difficult to achieve, but when the valve body is turned on the machine tool for the second time to process the O-ring groove at the other end, if there is no reliable It is very difficult to achieve the coaxiality of 0.03mm, and it is more harmful to exceed the specified value. The chamfer at both ends of the spool cannot be used to 45°. This kind of chamfer is very harmful. When the spool is assembled into the valve body of the four-column hydraulic machine, it is easy to damage the O-ring.












1. When the coaxiality of the valve body hole to the O-ring groove exceeds the specified value, the O-ring is placed in the groove, and the compression amount on one side is large, and the compression amount on the other side is small. In severe cases, the O-ring will be cut by half or one turn when the valve core is installed in the valve hole. The factory test was carried out on the test bench. Due to the short time, low oil temperature and no back pressure, no oil leakage was found. When the 1500-ton hydraulic press equipment was used for a period of time, oil leakage began.





2. The coaxiality between the O-rings at both ends of the valve body and the main valve hole is qualified, and the chamfering at both ends of the valve core should be 15° and 20°. If it is larger than the specified value, the O-ring will be broken.












3. Both are qualified. Lubricating oil is not applied to the valve hole, O-ring and valve core during assembly (misunderstanding of the use of imported lubricating oil), and the O-ring can also be installed when the valve core is installed in the valve body of the four-column hydraulic machine. Cut off a piece.





To prevent oil leakage from the control valve of the four-column hydraulic press, it should start from the two processes of processing and assembly to ensure that the hydraulic components do not leak.

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