Quad rings dynamic sealing configurations

Quad rings - Darcoid

Quad Rings, also known as X-Rings, can be used in a wide variety of static and dynamic sealing applications. The four-lobed design provides twice the sealing surface in comparison to a standard o-ring.The double-seal action requires less squeeze to maintain an effective seal.This reduction in squeeze means less friction and improved seal life. Quad Ring parting lines are between the lobes, away from the sealing surface, thus eliminating the problems of leakage often resulting from a parting line's irregular surface as found on an O-Ring.

Quad Rings are designed to outperform a standard O-Ring in rotary seal applications.The four-lobed configuration creates a more stable seal avoiding spiral twisting.This allows the use of a more narrow groove width than a standard O-Ring groove, but can also be used in a standard O-Ring groove. To minimize breakaway friction, an O-Ring groove must be wide enough to allow rolling or twisting of the seal. In the long stroke of a reciprocating seal application, this twisting action can strain and eventually tear the rubber, causing a failure mode known as spiral twist.

To prevent spiral twist, a Quad Ring seal's four-lobed configuration is designed to withstand the distortion and extrusion often caused by high or pulsating pressure. To accommodate these forces, a Quad-Ring seal uses a narrower groove than a comparable O-Ring seal. The four lobed seal design not only provides lower friction than an O Ring, but also, due to its square cross section, it resists spiral twist. ` Quad rings can be used for Static and Dynamic applications. In case of static application Quad rings are fitted in the assembly where there is no dynamic movement. Whereas, with a dynamic sealing configuration, quad ring in an internal groove should be stretched over the root of the groove. With external grooves, Quad ring is installed in compressed state.

What's more, a lubricant reservoir formed between the sealing lips improves performance at start up. Their 4-lobe configuration also helps to eliminate the seal from twisting in the groove causing premature failure. 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 are available exclusively from the house of Darcoid Nor-Cal Seal.