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PTFE Seals The Scope Of Application Is Constantly Being Excavated

Yangzhong Tianyou Seals Co.,Ltd | Updated: Sep 08, 2017

PTFE Seals The scope of application is constantly being excavated

Teflon special properties make the application of PTFE seals are constantly excavated and expanded, and according to the specific needs of users design and production of different shapes of Teflon seals to solve user needs, in addition to common Of the polytetrafluoroethylene O-ring, the specific can be broken down into the following:

 U-shaped ring

 A U-shaped seal made of PTFE as a base and a filler can be mounted on a moving piston and can be sealed as a fixed seal on the housing without the need to adjust the packing gland.

The U-shaped seal is a balanced seal, which is sealed in both the inner and outer diameters and is provided with a support ring to protect the seal against flattening or twisting under pressure. U-shaped ring in the sealed groove, the gap between the ring and the lip 1.6 ~ 3mm, that is, at least 25% of the thickness of the lip, so that the lip can not touch the ring, so that the system fluid free access, which can use self-tight principle To seal. The transverse holes in the vertical web of the compression ring ensure the pressure balance within the U-shaped opening. Figure b shows the use of a rubber O-ring to increase the static and dynamic contact force to improve the initial sealing effect.

U-shaped ring installation

 A) U-shaped seal with piston movement;

 B) U-shaped seal with O-ring

Polytetrafluoroethylene gasket


 PTFE can be added with PTFE, graphite or molybdenum disulfide can be made V-ring. The V-rings are assembled in groups of multiple rings, with a convex seat and a concave seat. This can improve the sealing effect and service life. Figure c shows the use of wave spring to increase the automatic contact force, which play the role of preload and automatically compensate for the V-ring wear.

V-shaped seals and parts

 A) V-ring assembly;

 B) convex and concave seat;

 C) V-rings and assemblies with corrugated springs

The inner profile of the lip is a curve, and the outer contour is a straight line, so that the two adjacent rings are in point contact to obtain a higher flexibility. The curve of the lips causes the sealing ring of the set together to form a single line of contact, forcing the seals to deflect against the 45 ° bevel of the adjacent circle with minimal friction.