Xring also known as quad ring seal, is a four-lip seal with a shape similar to X, so it is called X-Ring. Its performance has been improved on the basis of the o-ring and can replace most o-ring occasions. In the rubber seal industry, X-Ring is usually classified as O-Ring, and many people call it x profile o-ring or x-ring face seal.
With the development of modern industrial sealing technology, the defects of o-rings in sealing technology are more and more manifested. For example, the o-ring is prone to helical twist damage during the sealing installation and the use of the dynamic seals; when the pressure is high, it is prone to extrusion, causing gap bites; in the dynamic sealing state, because of high start frictional resistance it increases the power loss of moving parts; due to the poor self-lubricating effect and the anti-distortion ability during use is low, it is also easy to cause distortion damage. These defects and deficiencies can easily lead to seal failure. Due to its special geometric shape, the X-Ring or Quad Ring seal has many advantages that the o-ring does not have in its sealing function, especially in the dynamic seal.
How it functions
The quad ring seal is a double-acting seal with its elastic sealing ability. The radial or axial contact stress generated by the pre-compression during initial installation is superimposed with the system pressure to achieve the sealing function.
The superimposed sealing force increases as the system pressure increases. Under the action of pressure, the quad ring seal can transfer the pressure evenly to all sides like a fluid with high surface tension.
Same as the Rubber O-Ring Seals, the main materials of Quad-Rings are also NBR, Viton, and Silicone. Higher performance materials can be made into high-grade Aflas x-ring seals, FDA EPDM quad o-rings, and so on.
NBR is the first considering material we suggest. About 50% of quad rings in the world are made of NBR compound because of its good property and low cost.
FKM / Viton is an x-ring material with the best comprehensive performance and is widely used in various sealing equipment with high standards. It was first invented by DuPont company and issued under the trade name “Viton”. With the time being, more and more people used to call this material Viton.
Silicone is more and more used in medical and food industries, especially FDA silicone. It is tasteless and non-toxic, not afraid of high temperatures, and resistant to severe cold.
X-Ring Rubber Seals are widely used but are mainly used for dynamic seals and their use is limited by pressure and speed.
Application of Dynamic Seal
For sealing reciprocating pistons, piston rods, plungers.
Shafts or spindles for sealing oscillating, rotating, or helical movements.
Application of Static Seal
Seals radially stationary parts such as sleeves, end caps, and tubes.
Seals axially stationary parts such as flanges, cover plates, etc.
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