Hydraulic Seal

Hydraulic seal types

Hydraulic sealing elements have 5 main category: Rod seals, Piston seals, U-symmetrical seals, Wiper seals and guide rings. Hydraulic seals prevent leakage of all types of fluids, while also being characterized by extreme resistance to high pressure, high temperatures and direct force acting inside the cylinder of the machine. The selection of appropriate gaskets for power hydraulics allows for a significant extension of the service life.

Hydraulic seal size chart

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U-cup Piston-rod seal is a single acting U-symmetric seal. It is designed to have symmetrical lips in order to be used in both for rod and piston applications.

 

Double lip Wiper Seal

Double Lip wiper seal has two sealing lips, one oil seal lip and one dust lip.

Double Lip Rod Seal

Double lip Rod seal has two sealing lips. It is the most critical seal on any type of fluid power equipment. It prevents leakage of fluid from the cylinder to the outside.

Piston-rod seal :

Piston-rod seal is a single acting symmetric seal. It is designed to have symmetrical lips in order to be used in both for rod and piston applications. In addition, It has mechanically trimmed lips. Therefore, it creates excellent contact pressure in both dynamic and static one-way sealing. Since it has symmetrical lips, it is applicable in both for rod and piston applications.

Piston Seal :

Piston seals are located between the piston and the cylinder wall in a cylinder. It creates a pressure barrier and prevent fluid passing the piston. This pressure is required to control the cylinder motion or to maintain the position of the piston when at rest. Clearance between piston and cylinder wall is extremely tight. Piston seal has a vital role to maintain the relationship between these reciprocating components. Thus, correct seal size and material is critical to the performance of the cylinder.

Rod Seals :

Rod seal is the most critical seal on any type of fluid power equipment. It prevents leakage of fluid from the cylinder to the outside. Leakage through a hydraulic cylinder can reduce equipment performance. In extreme cases it can cause environmental issues. Particular attention should be paid to pair the rod seal and the wiper for the best sealing performance. If a less effective rod seal is used in a hydraulic cylinder, the wiper can scrape off the microscopically thin film of oil that remains on the rod in microscopic surface imperfections during the return stroke, resulting in system leakage.

Wiper Seals :

Wiper seal ensures that foreign particles are not introduced into the hydraulic cylinders. The lip is designed in a particular way that it reliably wipes off  the dirt but leaves a residual oil film on the rod. Its structure makes it excellent in dust resistance and less oil leakage.

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