Installed on the piston, the main function is to seal the gap between the piston and the cylinder, stop the hydraulic oil leakage and so on. The piston seal is the main seal in the hydraulic cylinder, and the bidirectional pressure is the main seal that the hydraulic cylinder can withstand the pressure value. The main requirements for the piston seal are good sealing effect, good pressure holding effect under static state, strong pressure bearing capacity during movement, extrusion, small friction coefficient, long service life and so on.

Although the seal is an auxiliary part of the hydraulic equipment, the quality of the seal and the sealing device is the key to directly affect the normal operation of the hydraulic system. The quality of seals has restricted the performance and performance of hydraulic components and hydraulic systems to a certain extent, the length of service life, and the key to affecting the grade and level of hydraulic equipment and participating in the competition, which is also the main factor of the quality difference of external hydraulic components. Often the loss caused by the failure of individual seals may be tens of millions of times the value of the seal itself.

They are the static seal ring in the hydraulic cylinder, the static seal of the end cap is to prevent the hydraulic oil from leaking out of the gap between the end cap and the cylinder, single-sided pressure, requiring strong extrusion capacity and good sealing effect; The piston static seal is bidirectional pressure, and the hydraulic oil leaks out between the piston and the piston rod, which requires strong extrusion capacity and good sealing effect.