The diameter change of pvc is generally solved by casing, which is generally smooth and easy to flow to avoid sewage backflow, but if the pipeline is not in a straight line, it can be straightened by casing.

In the pipeline installation, the pipe fitting with the transition from large diameter to small diameter is called casing, and the casing cannot be used when the diameter of the high-pressure automatic sprinkler pipeline is changed, because the cast iron casing is a low-pressure pipe fitting.

In addition to using steel pipes as raw materials to produce large and small heads, steel plate stamping process can also be used to produce some specifications of large and small heads. The shape of the die used for drawing is designed according to the size of the inner surface of the big head and the small head, and the steel plate after blanking is stamped and drawn by the die.

Extended data:

Application:

1, when the flow of the fluid in the pipeline changes, such as increasing or decreasing, and the flow requirement changes little, the reducer should be used.

2, in order to cooperate with the interface of flowmeter, regulating valve and other instruments, pressure reducer should also be adopted.

3. At the entrance of the pump, in order to prevent cavitation, a pressure reducer is needed.

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