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 on one side is very large, and the compression on the other side is small. When the deviation is serious, the O-ring will be cut off by half or one ring when installing the valve core in the valve hole. In the test bench to make the factory test, due to the short time, low oil temperature and no back pressure, will not find oil leakage, when in.forming hydraulic pressAfter using the equipment for a period of time, it starts to leak oil.
2. The coaxiality of the O-rings at both ends of the valve body and the main valve hole is qualified. The chamfer at both ends of the valve core should be 15 ° and 20 °. If it is greater than the specified value, the O-rings will also be broken.
3, both are qualified, in the assembly did not apply lubricating oil to the valve hole, O-ring and valve core (imported lubricating oil use misunderstanding),four-column hydraulic pressThe O-ring can also be cut off when the valve body is installed.
To prevent the molding hydraulic press control valve oil leakage, from the processing and assembly of the two processes to start, to ensure that the hydraulic components do not leak.