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Design A medium to heavy duty double acting seal, the Hallite 56 has shown itself over many years to be an effective androbust piston seal in a wide variety of applications. Designed for split pistons it offers the benefits in terms ofsealing efficiency and low friction gained from rubber/fabric and a specific proportion of rubber in contact with thecylinder surface.The centre of the seal is rubber which is bonded to two ‘U’ section bases of rubberised fabric, and is compressedby 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 itsability 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 therecommended operating conditions.

DESIGNThe Hallite 601 high-performance, general purpose, single-acting U-ring rod or piston seal is designed to provide a dry sealing solution in light and medium duty applications and manufactured in Hythane® 181, Hallite’s high-performance polyurethane, for easy installation and excellent low temperature performance. The seal can be considered for use in heavy-duty applications when used with a suitable full depth back-up ring. The sealing lips are trimmed at an angle to give optimal sealing performance.The symmetry of the Hallite 601 makes it ideally suited for single-acting rod or piston applications. The Hallite 601 can also be fitted back-to-back for use in double-acting applications, but the Hallite 606 single-acting piston seal is the preferred option.