it is well know that the diaphragm VALVE is available for more fields for the advantages that it can be either manually or automated controlled by various types of actuators. It is originally used for non-hygienic applications for some limitations. And it has expanded its application for bio-pharmaceutical industry by using compliant materials that can withstand sanitizing and sterilizing methods. And generally speaking, the overall the diaphragm valve is classified into two main categories. The one seals over a "weir" and the other seals over a seat. The major different is that the previous kind has its two ports in line with each other on the opposite sides of the valve and the later one has the in/out ports located at a 90 degree angle from one another.

At last, taking a look at its proper materials is necessary. For the valve body, brass, steel and plastic is appreciated. And cast iron, ductile iron, carbon steel and stainless steel are common steel types. What else, for the body lining materials, it is generally determined by the temperature, pressure and chemical resistance. For example, the NR/Hard Rubber/Ebonite, BR/Soft rubber and EPDM are common rubber lined types.Furthermore, SI/Silicone rubber and such unlined or rubber lined type is proper to make the diaphragm.

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