Designed for use on one-piece solid pistons the KB09 is a 4-piece double acting/bi-directional piston seal comprising of a central polyurethane sealing element, elastomeric energising ring and precision machined thermoplastic guide rings which are split to allow assembly onto the solid piston.
The precision machined guide/wear rings allow higher working pressures and larger clearance gaps between the hardware components.
The central 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. While offering extrusion resistance the guide rings also support and centralise the piston head while reciprocating in the hydraulic cylinder and help prevent metal to metal contact under side load conditions
KB09 is commonly used when repairing hydraulic cylinders that have had the bore honed to a non-standard size.