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25MayHallite 755 Double-Acting Piston Seal
DESIGN
The Hallite 755 double-acting piston seal is a compact, low friction seal for light to medium duty applications designed originally to fit North American NFPA groove standards. The Hallite 755 is comprised of a tough, wear-resistant thermoplastic elastomer face seal which is pre-loaded by a square cross-section NBR expander. The face material comes in a number of material options to extend operating conditions. The housing width allows a narrow width piston to be used. We ecommend that an adequate bearing, such as the Hallite 506 or 87 bearing strip or the Hallite 533 molded bearing, is mounted on one or both sides of the seal. For further details of bearing grooves, please refer to the appropriate product data sheet- 25May
Hallite 65 Double Acting Seal
Ideal for light duty one piece piston applications, the Hallite 65 double acting seal is a simple, effective and economical design for pressures up to 160 bar/2500 p.s.i. its compact dimensions enable the designer to keep the length of the piston to a minimum. It is an assembly of a continuous rubber seal and two scarf cut bearings. The nitrile rubber seal is designed to be pre-loaded by the housing to ensure an effective seal at low pressure. The outward thrust of the rubber seal on the bearings as it reacts to increasing pressure prevents any extrusion damage in the sealing area. The polyacetal bearings are proportioned to support the piston and its side load.
