Designed for use on one piece pistons, the seal assembly consists of a filled PTFE high performance outer sleeve, pre loaded and pressure energised by a precision moulded NBR element. These two components are protected from extrusion at either side by the fitting of two low friction plastic anti-extrusion rings making the seal highly resistant to shock loads as found in heavy duty mobile equipment. The housing dimensions are those used in standard metric J.I.S. cylinders.
|Max Speed||Temp. Range||Temp. Range|
|m/s||-30°C to 80°C||-30°C to 100°C|
|4||350 Bar||280 Bar|
|2||500 Bar||400 Bar|
These range perameters are Maximum simultaneous conditions. Optimum service conditions are affected by temperature, speed, pressure, surface finish and extrusion gaps.
Refer to Appendix 1 for further information
|DIN||Hydraulic Fluid Description||°C|
|H||Mineral oil without additives||100|
|H-L||Mineral Fluid with anti corrosion and anti ageing additives||100|
|H-LP||Mineral oil as HL plus additives reducing wear, raising load||100|
|H-LPD||Mineral oil as H-LP but with detergents and dispersants||100|
|H-V||Mineral oil as H-LP plus improved viscosity temp.||100|
|HFA E||Emulsions of mineral oil in water. Water content 80-95%||55|
|HFA S||Synthetic oil in water. Water content 80-95%||55|
|HFB||Emulsions of water in mineral oil. Water content 40%||60|
|HFC||Aqueous polymer solutions. Water content 35%||60|
|HFD R||Phosphoric acid ester based||NS|
|HFD S||Chlorinated hydrocarbon based||NS|
|HFD T||Mixtures of HFD R and HFD S||NS|
|HETG||Vegetable Oil based||60|
|HEES||Fully synthetic ester based||NS|
Note: Clearance gap F is the maximum permissable. i.e. gap completely on one side, in the temperature range of -30°C to 100°C The use of a suitably selected Claron bearing ring will effectively reduce the clearance gap F max. to a value closer to F/2 thus increasing the pressure capability of the seal.
For surface finish and recommended lead in chamfers refer to the illustration below. For housing dimensions and machining tolerances refer to the catalogue page of selected seal. Refer to Appendix 4 for value of tolerance symbols.
For the seal to function correctly, it is important that care be taken in fitting the seal within its housing. For a detailed checklist, refer to Appendix 3.