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The valve body of the diaphragm valve is lined with glue (or fluorine), and the valve cover is equipped with flexible diaphragm. The actuator opens and closes the valve through the upper and lower displacement of the diaphragm and the valve seat. The advantage of the diaphragm valve is to ensure the complete isolation of the medium from other parts besides the lining and diaphragm, which not only ensures the purity of the working medium, but also prevents the medium from causing erosion to other parts. In addition, there is no need for any form of separate seal at the stem. Because the working medium contacts only the diaphragm and the lining valve body, they can use a variety of different manufacturing materials, therefore, the valve can ideally control a variety of different working media, especially for medium with chemical corrosive or suspended particulate matter.
