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Pneumatic piston seal `redefines performance`

14 February, 2011

Freudenberg Simrit claims to have redefined the performance of pneumatic drives with a new piston seal which, it says, optimises load-bearing capacities in terms of friction, wear, mounting reliability, sealing effect, and the bridging of tolerances. The company has applied for a patent for the Simrit T-ring, which works by separating the dynamic and static sealing functions.

The single-piece, symmetrical piston seal – which will make its public debut at April’s Hannover Fair in Germany – has both a radial and an axial component. The dynamic sealing function is assumed by a sealing area with a large radius. The radial force needed for this is built up using geometric interference. This is said to eliminate radial compression of the seal cross-section – thus creating ideal conditions to minimise friction and wear – and to eliminate stick-slip effects.

Because of the thin area of the diaphragm-like T-ring, the static sealing function is built up simultaneously and separately, and is optimised according to function. The static sealing force is generated by pressure from concentric sealing edges on the front face of the groove. The diagram (above) illustrates the decoupled dynamic (1) and static (2) sealing functions.

In endurance tests, the new seal is said to have shown negligible wear.

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