DIPHARGM VALVE

Diaphragm valves are bi-directional, on-off throttle valves. They are used to control fluid flow by regulating the area with which media can enter and exit the valve, effectively changing its speed and velocity.

If the pressure is high enough, the diaphragm flexes open. As flow drops, there is a lower pressure differential across the valve. If the pressure drops low enough, the diaphragm can flex back to its original closed position. This happens when diaphragm elasticity becomes greater than positive downstream pressure.