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Designed for use on one-piece solid pistons and commonly used in mobile hydraulics in machinery such as excavators, the KB23A is a 4-piece double acting/bi-directional piston seal comprising of a central filled PTFE sealing element, elastomeric energising ring and precision machined thermoplastic guide rings which are split to allow assembly onto the solid piston.

The precision machined back-up rings allow higher working pressures and larger clearance gaps between the hardware components.

The central filled PTFE sealing element is energised by the elastomer ring which provides initial radial compression upon installation to provide low pressure sealing, when subjected to system pressure the seal energises to provide further compressive force and leak tightness.

The KB23A requires guide/wear rings to be placed either side of the seal to keep the piston centralised in the cylinder bore while reciprocating under system pressure.