Types and functions of PVC Compression Coupling

Types and functions of PVC Compression Coupling

There are four types of Compression Coupling in PVC drainage pipe fittings:

(1) When the story height is less than or equal to 4m, the riser shall be provided with a Compression Coupling for each floor; when the story height is greater than 4m, it shall be determined according to the design expansion.

(2) The Compression Coupling of the horizontal trunk pipes shall be determined according to the design expansion and contraction amount.

(3) When the straight pipe section from the confluence fitting on the horizontal branch pipe to the riser exceeds 2m, Compression Coupling shall be provided, but the maximum distance between Compression Coupling shall not exceed 4m; there shall be fixed support between the two Compression Coupling to control the pipeline Expansion direction.

(4) The design expansion of the pipeline should not be greater than the maximum allowable expansion of the Compression Coupling.


The function of the Compression Coupling of PVC down water pipe is:

1. PVC is a rigid pipeline and has no expansion and contraction ability. In order to deal with the expansion and contraction of the pipeline caused by the environment, it can only rely on expansion.

2. Expansion joints are generally used in PVC drainage pipes. Retractors are generally used in heating pipes. The two are not interchangeable.

3. Expansion joints are provided for the water to prevent the heat expansion and contraction of the medium or the impact caused by various water hammers.

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