Hallite Double-Acting Piston Seal 58 3.3/4x4.3/4x1.3/4inch 1pc

Design
The Hallite 58 double acting piston seal combines the Hallite 56 seal with bearing rings to give a very robust heavy
duty seal assembly for split pistons. It enables the designer to use larger clearances and, with the integral bearing
rings, to restrict the piston length.
The assembly comprises a seal and two L shaped bearings. The centre of the seal is rubber which is bonded to
two ‘U’ section bases of rubberised fabric, and is compressed by the housing to obtain an effective low pressure
seal. When the pressure increases the rubber energises the ‘U’ section and deforms it to the housing, increasing
the sealing area and improving the seal.
Rubberised fabric is used to protect the rubber, because it has strength and durability which combines with its
ability to retain lubricant to help keep friction low and reduce wear.
Supporting the seal at either end is a polyacetal bearing proportioned to react to the pressure on the seal to
prevent extrusion damage, and support the piston and its side load.