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plastic diaphragm valve working principle

The plastic diaphragm valve is a globe valve which uses diaphragm as the opening and closing part to close the flow passage, cut off the fluid and separate the inner cavity of the valve body and the valve cover. It is a special type of block valve. Its opening and closing piece is a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving parts. It is widely used in various fields. Plastic diaphragm valve materials are FRPP, UPVC, CVPC, PVDF, PPH.


The plastic diaphragm valve is a flexible diaphragm or combined diaphragm installed in the valve body and valve cover, and its closing part is a compression device connected with the diaphragm. The valve seat can be weir shaped or the wall of straight flow passage. The advantage of the diaphragm valve is that its operating mechanism is separated from the medium path, which not only ensures the purity of the working medium, but also prevents the possibility of the medium impacting the working parts of the operating mechanism in the pipeline. In addition, there is no need to use any form of separate seal at the stem unless used as a safety feature in controlling hazardous media.Diaphragm with a variety of media, especially with a variety of media can be used to control the valve body.

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The operating temperature of plastic diaphragm valve is usually limited by the materials used for diaphragm and valve body lining, and its working temperature range is about - 40 ~ 130 ℃. Diaphragm valve structure is simple, only by the valve body, diaphragm and valve head assembly of three main components. The valve is easy to be disassembled and maintained quickly, and the diaphragm can be replaced on site and in a short time.


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