Compression fitting

from Wikipedia, the free encyclopedia
Compression fitting

A compression fitting is a liquid-tight connection of pipes or hoses . Crimped connections are used, for example, when connecting sanitary facilities or in aquarium construction.

The components of a compression joint are typically: the union nut , the clamping cone , backing ring and squeezing seal (rubber ring).

The union nut has a concentric opening with an internal thread on one side and a slightly smaller opening on the other, which corresponds approximately to the diameter of the pipe to be connected. Starting from the smaller opening, the inside diameter widens conically to the diameter of the thread.

When the union nut is tightened, the conical surface pushes the clamping cone against the insert ring and the sealing ring. The sealing ring is squeezed together and thus closes the annular gap between the pipe and the body of the compression fitting. When the nut is tightened further, its conical surface slides onto the clamping cone and forces it together. Since the clamping cone is made of a soft material, its cross-section is reduced. So he clamps the pipe and fixes it in this position.

Since the clamping cone initially rotates with it, the insert ring in between ensures that the rubber seal is not twisted and damaged.

Small diameter compression fittings are often used together with angle valves that are installed under washbasins in order to be able to shut off the water supply lines before replacing the fitting . A special design of these compression fittings does not require a clamping cone or insert ring. These have a wide pinch seal made of hard rubber or plastic, which seals and fixes the pipe at the same time. Since there are generally no tensile forces acting on the connected tube or flexible connection hose that lead to the fitting, no metallic clamping cone is required here.

A compression fitting with length compensation has a slightly higher union nut with a longer compression seal (plastic sleeve), in which the clamped pipe does not necessarily have to be pushed in as far as it will go.

See also

Web links