Double acting NBR piston seal with rubberised fabric reinforcement & clip on POM anti-extrusion Bearing rings.

- Design -

Designed for use on split pistons, the seal is a precision moulded rubber element with rubberised fabric reinforcements. Style DPW is fitted with clip on anti-extrusion bearing rings on the O.D. to allow larger machining clearances between the piston head and cylinder bore, and to permit higher working pressures. The Polyacetal bearing rings also support the piston head under side load conditions thus preventing metal to metal contact. The bearing rings are an integral part of the seal therefore react directly to operating pressures thus closing the extrision gap. The seal is designed with sufficient radial sectional interference that on complete assembly low pressure sealing is effected. The supporting rubberised fabric has the capability of retaining the sealing media thus assisting in reducing friction and wear.
Style DPW has proven to be effective over a wide range of applications.

- Operating Conditions -

Maximum Pressure

Max Speed
Temp. Range
-30°C to 100°C
250 Bar
400 Bar
These range perameters are Maximum simultaneous conditions.
Optimum service conditions are affected by temperature, speed, pressure, surface finish and extrusion gaps.

- 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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