Hydraulic seals are non-metallic rings that fit into a groove or assembled as a combination of rings. This forms a seal assembly that either blocks or separates fluid in reciprocating motion devices. They are critical in many machines, helping to convert fluid power into linear motion.
They are usually made from comparatively soft materials, such as polyurethane, PTFE, or rubber. Different materials are suitable for different operating conditions, including fluid type, temperature, and pressure.
If the quality of the seal is not good, it directly affects the performance of a hydraulic system. If fluid leaks out then efficiency of the machine is reduced. An effective hydraulic seal prevents fluid leakage and stops air or dust entering the machinery. Completely preventing all leakage is impossible but a good seal will only allow a tiny amount of leakage.
A seal must have compatibility with the fluid it is used with. It also needs to have a small friction drag. It should have a long operating life, be heat and pressure resistant, and have good elasticity.
Hydraulic transmission devices are used in many sectors, such as industry, agriculture, and national defense.
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