Ideal for light duty one piece piston applications, the Hallite 77 seal is a simple, effective and economical design. 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 pair of polycetal bearings are proportioned to support the piston and its side load.