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PTFE-Seals for Reciprocating Rods

, and . Proceedings of the 9th International Conference on Fluid Sealing, Cranfield, (1981)34.

Abstract

Since around 1974 a number of new types of hydraulic rod seals appeared in hydraulic practice. Built for narrow space applications and requiring no more axial space than an O-Ring, these seals normally consist of modified PTFE-material and a separate rubber squeeze ring. Characteristically these ''PTFE-Edge-Seals'' have a sharp edged lip towards the high pressure side and a converging or parallel booster section beyond the low pressure end of the seal contact. In earlier tests these seals showed good high pressure sealing ability and very low friction. A tandem arrangement of such seals even showed zero-leakage in a long endurance test. A description of a variety of PTFE-Edge-Seals and test results obtained with single and tandem ins tallations are presented.

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