What is an internal expansion seal

Seal is a component that prevents medium leakage and foreign matter from invading machinery and equipment. Its main function is to seal. Its main body is made of rubber, and seals play an important role in many industry categories.

What performance conditions should a qualified seal have:

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

2, stable performance, compatible with medium, not easy to produce chemical reaction;

3. Good mechanical properties, tear resistance, strong expansion and contraction rate, and good expandability;

4, easy to process and form, and can maintain precision;

Meeting the above requirements is only a necessary condition for a qualified sealing ring. For example, some sealing rings that require special working conditions must be manufactured according to higher specifications.

Internal expansion seal is a type of static seal, which belongs to the technical field of secondary seals for large pipelines. Simply put, the seal exists for repairing leaks.

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

The principle of the inner expansion type sealing ring is that when the sealing ring is assembled at the leakage point, the inner expansion phenomenon is realized through the force of the inner expansion steel ring. The sealing ring supports the inner wall to block the leakage point, and finally completes the sealing work.