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Lining diaphragm valve is a special form of cut-off valve, appeared in the 1920s.Its opening and closing part is a diaphragm made of soft materials, the valve body cavity and cover cavity and drive parts separated, so called diaphragm valve.The most prominent feature is that the diaphragm separates the lower body cavity from the upper cover cavity, so that the stem, disc and other parts above the diaphragm are not corroded by the medium, eliminating the packing seal structure, and no leakage of the medium.

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