Prevention of leakage at pipe joints
In hydraulic system, both metal pipe joint and hose joint are prone to leakage. For the sleeve type pipe joint, mostly due to the pipeline by a larger external force or impact force, the sleeve loose or pipe end deformation caused by leakage, should check whether the sleeve is out of round, there is no defect edge, pipe end is intact and the clamping degree of the sleeve nut, at the same time to eliminate the external force of the pipeline. For flaring type pipe joint, mostly due to excessive flaring, quality does not meet the requirements or multiple disassembly, resulting in flaring deformation or cracks caused by leakage, at this time, the front end can be cut off for flaring again. If the top pressure of the male and female cone is used for sealing, the leakage is mostly due to the damage of the two cones, and the cone can be ground with abrasive sand.
In cases where the "о" ring is used to seal against the face or outer diameter, the leakage causes are as follows:
Leakage caused by aging or deformation of the "о" ring
Improper assembly of "о" shaped ring, resulting in uneven pressure when connecting two planes or leakage caused by "о" shaped ring cutting
Leakage due to insufficient elastic deformation of "о" shaped ring due to uncompacted
Leakage caused by too deep "о" ring slot.
In this case, a "о" shaped ring with the same outer diameter and a thicker section shall be selected again. Also, the sealing plane with check slot may be cut or ground to reduce the check slot depth and give the "о" shaped ring sufficient elastic deformation (compression shall generally be between 0.35 and 0.65mm).
For the use of oil resistant rubber board, wool felt, mild steel board, combined sealing gasket or sealant pipe joint leakage, no matter what the material, should first check whether the seal is damaged, deformation, aging and roughness is too large, and then take the corresponding measures.
