|The O-ring is the most common type of fluid seal. An O-ring's simple design lends itself to a multitude of sealing uses, including static, reciprocal, oscillating, and dynamic applications at low speed and pressure. In elevated operating pressure environments, addition of a backup ring will greatly increase the extrusion resistance of an O-ring.
The most basic shape of an O-ring is a simple circular sealing torus, usually made from an elastomeric material. Beyond the standard O-ring, All Seals can supply more advanced sealing designs such as Quad Rings®, which are specially designed for low pressure sealing. All Seals also offers O-rings in advanced materials such as Viton™, Viton Extreme®, and Teflon®.
All Seals stocks over 200 million O-rings in 13,000 different size and material combinations.
Quad Rings®, can be used in a wide variety of static and dynamic sealing applications. With the unique 4-lobe configuration, Quad-rings have 2 sealing areas per side as opposed to 1 sealing area on an O-ring. Quad-rings require less squeeze to maintain an effective seal; therefore, reducing friction and increasing seal life. Their 4-lobe configuration also helps to eliminate the seal from twisting in the groove causing premature failure.
Quad Rings® have the same dimensions as the AS568A O-ring sizes, also referred to as standard size O-rings. Quad-rings are also available in other compounds to suit your particular application.
Extrusion failure is one of the most common types of O-ring failure. When the internal pressure of an application becomes too great, the O-ring will actually extrude into the clearance gap. This extrudate will quickly be nibbled away causing a loss of material, and once sufficient material is lost, seal failure will quickly follow.