In hydraulic systems, seals devices serve two core missions: first, to prevent working medium from leaking out; second, to resist the intrusion of external dust and foreign objects into the system. The component that fulfills this critical function is the seal.
Though seemingly insignificant, seals are the cornerstone of stable hydraulic system operation. Their reliability and service life have become key indicators for evaluating the quality of a hydraulic system.
Once the working medium leaks externally, it not only wastes oil but also contaminates machinery and the surrounding environment. In severe cases, external leakage can directly cause mechanical malfunction, and even lead to equipment damage and personal safety accidents.
Internal leakage causes a sharp decline in the volumetric efficiency of the hydraulic system, preventing it from reaching the required working pressure and ultimately rendering the equipment unable to operate normally.
Tiny dust particles that enter the system accelerate wear on the friction pairs of hydraulic components, and this wear in turn triggers further leakage — creating a vicious cycle of intrusion → wear → leakage → greater vulnerability to intrusion.
With the exception of clearance seals, hydraulic systems generally use seals to control the gap between two adjacent coupling surfaces below the minimum gap through which the sealed liquid can pass, thereby achieving effective seals.
Among contact seals, there are two main categories:
- Self-seals compression-type seals
- Self-seals self-tightening seals (i.e., lip seals)
Precisely because seals directly affect the efficiency, safety, and service life of hydraulic systems, selecting the correct seal is of paramount importance.
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