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KB22 is a pressure activated packing set that comprises of a main U-ring sealing element and a male pressure/support ring.

The main U-Ring sealing element is designed to provide initial sealing force across the sealing faces upon installation. Sealing force is increased under system pressure through the pressure/support ring being forced into the U-shaped cavity, this spreads the sealing lips further to add increased seal contact force.

Although the KB22 is an old design of seal and the use of a more advanced sealing solution is recommended, it is still favoured by users of older hydraulic equipment commonly used in the steel industry.