Diaphragm Valves

Diaphragm valves, also called membrane valves, consist of a valve body with two or more ports, a diaphragm, and an "overflow or saddle" or seat on which the diaphragm closes the valve. Diaphragm valves can be operated manually or automatically.
There are two main categories of diaphragm valves: one type seals over a "weir" (saddle) and the other type seals over a seat. The second type is also known as "full bore ball or straight-way" valve) The dam and the saddle is the most common type of process applications and seat type is commonly used for sludge applications to reduce the blocking issues, but there is also a process valve.