Packing arrangement for a floating piston

Abstract

A packing arrangement for a floating piston dividing a cylinder into first and second chambers comprising a circumferential groove formed in the sliding surface of the floating piston; a circumferential elevation dividing the bottom of the groove into first and second spaces situated on either side of the elevation; backing material placed in the groove; a sealing ring radially situated upon the backing material; first and second extensions on the backing material projecting into the first and second spaces, respectively; each extension having first and second lips forming an annular space between the bottom of the groove and the internal surface of the backing material; the first lip of each extension abutting a lateral wall of the groove and the second lip of each extension abutting a lateral surface of the elevation; a first pressure channel connecting the first chamber with the annular space formed by the first extension; and a second pressure channel connecting the second chamber with the annular space formed by the second extension.

Dependencies are inferred from the claim text.