In the hydraulic system, both metal pipe joints and hose joints are prone to leakage. For ferrule type pipe joints, leakage is mostly caused by the loosening of ferrule or the deformation of pipe end face due to large external force or impact force on the pipe. At this time, check whether the ferrule is out of round, whether the cutting edge is damaged, whether the pipe end is intact and the compression degree of ferrule nut, and eliminate the external force of the pipe.
For flared pipe joints, most of them leak due to excessive flared, unqualified quality or repeated disassembly, resulting in flared deformation or cracks. At this time, the front end can be cut off and flared again. If the male and female cone top pressure is used for sealing, the leakage is mostly due to the damage of the two conical surfaces. The conical surfaces can be ground with abrasive sand.
In some“ о” When the O-ring is sealed against the end face or outer diameter, the leakage causes are as follows:“ о” Leakage caused by aging or deformation of O-ring; “ о” The O-ring is not assembled in place, so that the two planes are pressed unevenly or“ о” The O-ring is cut to cause leakage; “ о” The O-ring is not compacted and the elastic deformation is insufficient, resulting in leakage; “ о” The O-ring stop groove is too deep to cause leakage. Therefore, it is necessary to re select the one with the same outer diameter and thicker section“ о” The sealing plane with the stop groove can also be cut or ground to reduce the depth of the stop groove and make“ о” The O-ring shall have sufficient elastic deformation (the compression shall generally be between 0.35-0.65mm).
For the leakage at the pipe joint using oil resistant rubber plate, wool felt, mild steel paperboard, combined sealing gasket or sealant, regardless of the material, first check whether the seal is damaged, deformed, aged and too rough, and then take corresponding measures.