A double-acting four lip seal for static and dynamic applications. Quad-Rings (also known as X-Rings) are available in a wide range of elastomer compounds. Provides higher seal efficiency and lower friction than conventional O-Rings.
Avoiding Spiral Twist
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, the 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.
No Parting Line on Sealing Surface
Unlike O-Rings, where partitioning lines are on the
sealing surface, Quad-Rings seal’s parting lines lie between the lobes, away from the sealing surface. This design eliminates the problems of leakage resulting from a parting line’s irregular surface
Longer Seal Life
Because less squeeze means less friction with the four-lobe design, seals last longer. This means equipment in which the Quad-Ring seal is installed will operate longer and require less maintenance.
The sealing principle of the Quad-ring is nearly the same as the O-ring sealing. The initial sealing is achieved by the diametrical squeeze in a right angled groove. The system pressure
itself creates a positive sealing force.