Piston U Seals

Definition - What does Piston U Seals mean?

Piston U seals are single-acting seals that are used to seal pressurized fluid or air between the piston and the cylinder. They prevent the fluid or air from flowing to the cylinder head. These types of seals are mostly used in pneumatic cylinders to provide a dynamic pressure sealing. They are also used in hydraulic cylinders to separate the two pressure chambers on the piston and rod sides of the cylinders.

Petropedia explains Piston U Seals

The commonly material used for Piston U seals is Polyurethane; however, they are also available in different materials such as NBR, EPDM and FKM as well as per the manufacturer specifications.

Piston seals find their application in any equipment that uses pistons. In order to make the pistons work efficiently inside a cylindrical bore, piston seals are used so that the required pressure can be created.

Piston seals are used for both linear and reciprocating type applications. There are multiple types of piston seals available which can be chosen as per the requirements, they include:

  • Single acting piston seals– As name suggest, these seals are capable of providing dynamic pressure sealing from one side only with gravity or a spring returning the cylinder. These types of seals are U-seals or U-cups design.
  • Double acting piston seals – These seals are capable of providing dynamic pressure sealing from both the sides. Such types of piston seals are symmetrical from all sides.
  • Custom designed piston seals- These are seals that are custom-made to match the customer design and needs.
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