Diaphragm valves (or membrane valves) consist of a valve body with two or more holes, an elastomeric diaphragm and a “weir or saddle” or seat in which the diaphragm closes the valve. The valve body can be made of plastic, metal, wood or other materials, depending on the intended use.
Many diaphragm valve body sizes follow Manufacturer Standardization Association MSS SP-88. However, most of the diaphragm valves used in industrial applications are manufactured according to the ANSI / ASME B16.10 standard. Different standards make it difficult to use diaphragm valves as an alternative to most other industrial valves. Some manufacturers offer diaphragm valves that comply with ANSI B16.10 standards, making these diaphragm valves interchangeable with short model plugs and ball valves as well as most solid wedge, double disc and flexible wedge gate valves.