In the hydraulic system and its system, the sealing device is used to prevent the leakage of working medium and the invasion of external dust and foreign matters. The element that plays the role of sealing is the seal.
External leakage will cause waste of working medium, pollute the machine and environment, and even cause mechanical operation failure and equipment personal accidents.
Internal leakage will cause a sharp decline in the volumetric efficiency of the hydraulic system, which can not reach the required working pressure or even work.
Tiny dust particles invading into the system will cause or aggravate the wear of the friction pair of hydraulic components and further lead to leakage.
Therefore, seals and sealing devices are an important part of hydraulic equipment. Its working reliability and service life is an important index to measure the quality of the hydraulic system.
In addition to gap sealing, seals are used to control the gap between two adjacent coupling surfaces below the minimum gap that the liquid to be sealed can pass through.
In the contact seal, it is divided into self sealing compression seal and self sealing self tightening seal (i.e. lip seal).
