Hallite Double-Acting Piston Seals (Sil Piston)

Design
A medium to heavy duty double acting seal, the Hallite 56 has shown itself over many years to be an effective and
robust piston seal in a wide variety of applications. Designed for split pistons it offers the benefits in terms of
sealing efficiency and low friction gained from rubber/fabric and a specific proportion of rubber in contact with the
cylinder surface.
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.
The proportions of the range have been determined to give a satisfactory performance when used with the
recommended operating conditions.