58

- The Hallite 58 double-acting piston seal combines the Hallite 56 seal with bearing rings to provide a very robust, heavy-duty seal assembly for split pistons. It allows the designer to use larger clearances and, with the integral bearing rings, restrict the piston length.
- The assembly consists of a gasket and two L-shaped bearings. The center of the seal is made of rubber that is bonded to two rubberized fabric «U» section bases and compressed by the housing to provide an effective low-pressure seal. When the pressure increases, the rubber energizes the ‘U’ section and deforms it in the casing, increasing the sealing area and improving the seal.
- Rubberized fabric is used to protect rubber because it has strength and durability that combine with its ability to retain lubricant to help keep friction low and reduce wear.
- The seal support at each end is a polyacetal bearing provided to react to pressure on the seal to prevent extrusion damage and support the piston and its side load.