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If using wear rings, please consult Engineering Section (Section 2) of Parker's Fluid Power Seal Design Guide, Catalog EPS5370. Energizer Spring Element Materials:. For seals with 4615 or 4622 PolyPak shell, the standard spring energizer is a nitrile o-ring. For seals with 4651 PolyPak seal body, the O-spring energizer code must be specified.

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Hydraulic Seals Retain hydraulic fluids and pressures Hydraulic sealing systems for:. Earth-moving/construction machinery. Forestry machinery. Agricultural machinery. Material handling. Industrial hydraulics.

Vehicle engineering and mining.The main tasks of hydraulic seals are to retain hydraulic fluids, exclude solid or liquid contaminants and maintain hydraulic pressure. These tasks require different seal designs and accessories.

DescriptionParker’s PolyPak seal is a patented precision molded multi-purpose seal. The Parker PolyPak combines an O-ring type synthetic rubber o-spring with a conventional lip-type seal to produce a unique sealing device capable of sealing both vacuum, high and low pressure.Conventional lip seals, such as the standard u-cups are prone to leakage under low pressure because little or no lip loading is inherent in the basic seal design. The Parker PolyPak however, is a squeeze type seal and provides high sealability at low pressure.