Steel Cross,Stainless Steel Cross,Corbon Steel Cross,Pipe Fitting Cross Cangzhou Youlong Pipe Fitting Manufacturing Co., LTD , https://www.ypco88.com From practice, I explored the method of leak detection in the hydraulic system of machine tools. 1. Valve leakage control valve, throttle valve, pressure reducing valve, sequence valve and relief valve main oil leakage: adjustment handle, pressure screw cover, oil plug thread and joint surface. The main cause of oil leakage is due to the O-ring groove not meeting the requirements. Leakage method: 1 Disassemble the valve and rework the seal groove. 2 If the oil is leaking at the thread of the screw cap, a car can be pulled out on the end face of the screw cap.