Regarding the diaphragm on the pneumatic actuator of the pneumatic diaphragm valve
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The diaphragm located on the pneumatic actuator of a pneumatic diaphragm valve is apparently called the operating diaphragm. What is the function of this diaphragm? I’m seeking help from experts to explain it to me!
The function of the diaphragm is to convert the pressure of the pneumatic control signal into thrust, thereby moving the valve stem and consequently the valve element, so that the valve reaches a certain opening degree.
Its operating element is a diaphragm made of a soft material, which separates the interior cavity of the valve body from the interior cavity of the valve cover as well as from the driving components; hence it is called a pneumatic diaphragm valve. The most prominent feature of pneumatic diaphragm valves is that the diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, preventing components such as the valve stem and valve disc located above the diaphragm from being corroded by the medium. This eliminates the need for a packing seal mechanism, and it also prevents any leakage of the medium. Sunnai Engineering