SPW

Double acting NBR energised Bronze filled PTFE piston seal for one piece pistons, incorporating MoS2 filled PA anti-extrusion rings.

- Design -


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.

- Operating Conditions -


Maximum Pressure

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.





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.




- Housing -


For surface finish and recommended lead in chamfers refer the illustration below. For housing dimensions and machining tolerances refer to the table of recommended sizes and Tolerance Tables for value of tolerence symbols



- Fitting -


For the seal to function correctly, it is important that care be taken in fitting the seal within its housing. For details refer to Seal Installation.


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