Single vs. Double Acting Piston Rubber Seal Difference

12 March 2021

A piston seal works by containing tension on one side of a piston without spillage. This permits the greatest mechanical exertion to be applied to moving the piston along the drag of a chamber. A piston seal can be driven either powerfully or pneumatically, with a fitting piston seal plan for every framework and application.

Contingent upon the profile and the necessary attributes, a piston seal can comprise one or a few materials. Regular piston seal materials incorporate nitrile rubber (NBR), thermoplastic polyurethane (H-PU), acetal, Viton, EPDM and polytetrafluorethylene (PTFE). While deciding the best seal plan and material for a specific application, thought likewise should be given to the pressing factors expected, just as thinking about the satisfactory erosion misfortunes and whether the piston head is indispensable or part.

Here are the differences between single and double-acting piston rubber seals.

Single-Acting Piston Seals

Single-acting piston seals contain tension on one side of a piston without spillage. This permits the most extreme exertion to be applied to moving the piston along the drag of a chamber. Single-acting piston seals just contain tension on one side of the piston. The seal is needed to hold pressure from that heading, which at that point moves the piston along with the chamber in a ‘single activity’ – subsequently the name.

Significantly, the piston in single-acting chambers may have oil on the pressing factor side just, with the inverse side filled with air. In this manner, piston seals should leave at least oil film when passing along the chamber bore. The transportation of oil would some way or another outcome in a spillage. The airside of single-acting chambers may likewise push air out and attract air as the piston responds. This air may convey dampness and pollutants into the chamber, which can likewise prompt seal harm.

Double-Acting Piston Seals

Double-acting piston seals contain tension on the two sides of a piston, which is applied from one or the other bearing. This drives the smash that the piston is fixed to both in and out or stops it in a controlled position. They have an even cross area and indistinguishable sealing capacities in the two ways. Double-acting piston seals normally comprise a slide ring and an energiser. The misshaping of the elastomeric energiser gives sufficient power to keep the slide ring in unique sealing contact with the chamber bore, while additionally sealing statically against the seal lodging groove.

On account of a double-acting chamber, a generally thick oil film can be allowed between the piston seal and the chamber bore to limit grinding and wear. In any case, the transportation of liquid happening during dynamic activity is generally unimportant in many applications.