What Is An Internal Expansion Seal

What performance conditions should a qualified seal have:

1. It is not easy to deform, has resilience, does not corrode the contact surface, and does not pollute the medium;

2. Stable performance, compatible with media, not easy to produce chemical reaction;

3. Good mechanical property, tear resistance, strong expansion rate and good expansibility;

4. Easy to process and shape, and can maintain precision;

Meeting the above requirements is only a prerequisite for a qualified seal ring. For example, some sealing rings requiring special working conditions shall be manufactured according to higher specifications.

The internal expansion seal ring is a kind of static seal, which belongs to the technical field of secondary seals for large pipelines. In short, the seal is used to repair and repair the leakage.

The structure of the inner expansion seal ring is a composite seal composed of the main body of the rubber seal ring and the auxiliary body of the inner expansion steel ring. The rubber seal ring is used to form a gap after the pipe spigot is inserted into the pipe socket, and the inner expansion steel ring is close to the inner wall of the rubber seal ring, forming an inner expansion structure.

The principle of the inner expanding seal ring is that the inner expanding phenomenon is realized by the force of the inner expanding steel ring at the leakage point when assembling the seal ring. The sealing ring supports the inner wall to block the leakage point, and finally completes the sealing work.