Why choose R-ring instead of commonly used O-ring?
At present, R-type rings are widely used in industrial valves and have achieved good results in the food and pharmaceutical processing fields and plastic machinery industries that have strict leakage requirements. So, why should we choose R-rings instead of commonly used O-rings?
Comparison between R-ring and O-ring
① The R-ring has a large contact area, especially the static characteristics of the R-ring under pressure load. It has lower requirements on the quality of the contact surface than the O-ring. The heat generated during movement is difficult to dissipate, and it can generally only be used for static sealing.
② R-rings have better stability than O-rings because their sealing surface contact pressure is more uniform.
③Since the R-shaped ring has no deformation or movement under pulsating pressure load, it will not cause wear and has a much longer service life.
④Due to the larger volume and contact surface of the R-ring, a gap size that is 25% larger when using an O-ring can be allowed. This is important when sealing radially, where the gap size increases due to radial expansion, or when sealing axially, where a gap forms between the valve and the base plate surface under negative pressure caused by bending on the order of microns.
⑤In many cases, it is possible to use R-type rings instead of retaining rings. At this point it must be pointed out that the sealing effect of an R-ring whose outer edge is damaged by gap extrusion will still remain unchanged. In contrast, when using O-rings, the gap extrusion associated with constant deformation results in a loss of sealing effect.
⑥ Compared with O-rings, R-type rings can effectively reduce radial movement in flat seals, thereby effectively reducing oil leakage caused by pumping phenomena caused by pressure fluctuations. Although the slight deformation caused by pressure fluctuations may cause the oil vapor to slowly cross the sealing line formed by the O-ring, it is difficult to cross the sealing annulus formed by the R-type ring. This is equivalent to the echelon arrangement of countless sealing line clusters, making it difficult to continue oil and vapor leakage. , thus ensuring zero leakage from here is possible.
⑦ Because the original O-ring single line seal has been changed to the current line cluster surface seal, the service life of the seal has been greatly extended.
⑧Because there is no need to worry too much about the sealing ring being siphoned into the hole, the installation groove of the R-ring does not need to be equipped with a chute like the O-ring, which makes the processing complicated.