Quad Rings / X-rings

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Quad-rings are four lipped seals with a specially developed sealing profile. A wide range of elastomer materials for both standard and special applications allows practically all liquid and gaseous media to be sealed. The choice of a suitable material is determined by the temperature, pressure and media. They are vulcanized as a continuous ring. Quad-rings are supplied to the American Standard AS 568 A.

Quad ring has a double sealing function as compared to O-ring. The advantages of using quad-ring are:

* Avoid twisting in the groove.
* The seal does not tend to roll in the groove during reciprocating movement.
* Low friction. It requires less radial squeeze than a comparable O-ring.
* Less squeeze mean less friction, less wear, and thus a longer service life
* Very good sealing efficiency. Due to it special profile, a high sealing effect is achieved.
* A lubricant reservoir formed between the sealing lips improves start up

Quad-rings are self energizing double-acting sealing elements. The forces acting in radial or axial direction due to the installation give its initial leak-tightness. These forces are imposed by the system pressure. An overall sealing force is created which increases with increasing system pressure. When under pressure, the quad-ring behaves in a similar way to fluid with high surface tension and the pressure is transmitted uniformly to all sides.

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