The Crane Saunders Industrial Diaphragm Valve is a flow control device that uses a flexible membrane to open or close an opening in a pipeline. The membrane or diaphragm is just a flexible, pressure-responsive element that transmits force to operate the valve. The valve has a simple construction which includes a valve body, seat, diaphragm, and an actuator with a stem. A diaphragm is a flexible, pressure-responsive element that transmits force to open, close, or control a valve. Diaphragm valves are related to pinch valves, but use an elastomeric diaphragm. Crane Saunders Industrial Diaphragm Valve is very effective.