Piston Seals

Definition - What does Piston Seals mean?

Piston Seals, also known as piston rings are devices that used to tightly seal pressurized fluid and air in between a piston and the bore of a cylinder. They prevent the fluid or air from flowing to the cylinder head. These seals are also used in hydraulic cylinders for fluid sealing as well as in pneumatic cylinders to provide a dynamic pressure sealing.

Petropedia explains Piston Seals

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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