A DIAPHRAGM VALVES is a control device that utilizes a flexible membrane to close, or shut, an opening. Pressure increase or decrease on either side of the diaphragm causes the valve to move its position. Often, these valves are used in industries like food processing, pharmaceutical manufacturing, mining, and pollution control, among others. They can be made from a variety of plastics and metals, depending on which application they will be used for.

The operating power for a diaphragm valve can come from a variety of sources. A pneumatic diaphragm valve uses air pressure to open or close it. Sometime a solenoid, a wire-wrapped metallic component that can produce a magnetic field in the presence of electricity is employed to actuate the valve. Other times, it can be operated manually. In addition, hydraulic pressure is also commonly utilized.
There are two basic types of diaphragm valves - weir, or saddle type, and straight-way, or straight through, which seals over a seat. Weir valves typically have ports directly opposite each other on the valve. This kind is often used in pipes, through which gas, fluid, or slurry flow need to be regulated. Straightway valves??? ports are generally at 90