![]() ![]() The diaphragm is connected to a compressor by a stud molded into the diaphragm. The handwheel is turned until the desired amount of media is flowing through the system.įor start and stop applications, the handwheel is turned until the compressor either pushes the diaphragm against the bottom of the valve body to stop the flow or lifts off the bottom until the flow is able to pass through. Manual diaphragm valves are ideal for flow control by offering a variable and precise opening for controlling pressure drop through the valve. Instead of pinching the liner closed to provide shut-off, the diaphragm is pushed into contact with the bottom of the valve body to provide shut-off. Method Of Controlĭiaphragm valves use a flexible diaphragm connected to a compressor by a stud which is molded into the diaphragm. In the next section, we will examine the broad categories of diaphragm valves and where they are most useful. When the user desires the valve to be shut, the actuator is pressed and/or turned and the membrane is pushed into the edge of the solid damn, closing the valve.Ĭertain diaphragm valves can also have half open/restricted positions where the membrane is partially closed, allowing a throttled flow through the valve. A valve actuator is in contact with the inner membrane (or “diaphragm”) of the valve in its open position. How do diaphragm valves work?ĭiaphragm valves are simple in construction and operation. A diaphragm is a flexible, pressure-responsive element that transmits force to open, close, or control a valve.ĭiaphragm valves are related to pinch valves, but use an elastomeric diaphragm, instead of an elastomeric liner in the valve body, to separate the flow stream from the closure element. The valve body may be constructed from plastic, metal, wood, or other materials depending on the intended use.ĭiaphragm valves get their name from a flexible disc that comes into contact with a seat at the top of the valve body to form a seal. ![]() Diaphragm valves (or membrane valves) consist of a valve body with two or more ports, an elastomeric diaphragm, and a “weir or saddle” or seat upon which the diaphragm closes the valve. ![]()
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