Cylinder seals the main seal is to withstand the high pressure conditions of the mechanical system, with its obvious characteristics must be resistant to high pressure, and seal material requirements are also to have higher mechanical strength. Cylinder seals piston movement of low friction, the seal type must exist during the operation of the wear and tear, so the seal material should have a lower friction coefficient and higher wear resistance, better lubrication can not do without the seals intact . The state of the oil film comes from the ability to return to the oil, the operation to ensure that the oil back and forth to the system within the process of uniform, to ensure dynamic seal balance. Cylinder seal check valve function, the system pressure is low or reduced to zero, the back pressure has been formed can be immediately lowered to prevent the phenomenon of trapped oil.
Hydraulic cylinder seal secondary seal as a second seal, to withstand low pressure conditions or not under pressure conditions, its main function is to block the main seal through the oil film to ensure the formation of the process of zero leakage. Vice seal should have what characteristics? First, the construction machinery system operation, a good low-pressure sealing is important, so the low-pressure sealing performance is better; Second, the low-pressure friction process and wear seal to reduce the end to a short period of time to withstand system pressure, that is, in harsh conditions Environment, the formation of back pressure, but also to ensure that machinery and seals with the reasonable operation.