he main seal of the cylinder seal is to withstand the high pressure of the mechanical system, and its characteristics must obviously withstand high pressure, and the sealing material requirements are also high mechanical strength. The piston movement of the cylinder sealing element has low friction, and the type of sealing ring must have wear in the operation process. Therefore, the sealing material should have lower friction coefficient and higher wear resistance, and better lubrication condition cannot be separated from the integrity of the sealing element. The state of the oil film is due to its strong oil return ability, which ensures that the oil will be brought back and forth to the system during the process of even oil, ensuring the balance of dynamic sealing. Cylinder seals one-way valve function, when the system pressure is low or zero, has been formed back pressure can immediately drop down, to prevent the phenomenon of oil trap.
The secondary seal of hydraulic cylinder seals serves as the second seal. When it is under low pressure or not under pressure, its main function is to block the oil film passing through the main seal and ensure zero leakage during the formation process. What characteristics should the secondary seal have? First of all, in the operation process of construction machinery system, good low-pressure sealing is important, so the low-pressure sealing performance is good; Secondly, low pressure friction process and wear seal state reduced; The end shall be able to bear the high pressure of the system for a short time, that is, when the back pressure is formed under harsh working conditions, it can also ensure the reasonable operation of the matching of machinery and seals.
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