Pneumatic diaphragm regulating valve
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What is the principle of pneumatic diaphragm regulating valve?
The pneumatic diaphragm regulating valve is composed of an actuator and a regulating mechanism. The actuating mechanism receives a signal from the regulator to control the signal and generates thrust to cause the valve stem to produce linear displacement to promote the action of the regulating mechanism and change the flow of the fluid medium to overcome the influence of disturbance factors on the adjusted parameters to achieve the purpose of automatic adjustment.
It will become clear if you have the opportunity to see the disassembled parts with your own eyes.
It's nothing complicated, you'll understand it once you take a look at it.
The valve is adjusted through a diaphragm adjustment mechanism driven by air pressure.
The answer on the second floor is very correct. The actuator provides driving force or driving torque, which is used to overcome the unbalanced force, valve pressing force and friction force, so that the displacement changes in proportion to the input signal. It is divided into positive and negative. When the input signal increases, the displacement of the push rod moves outward.； The reaction is inward. The main difference is that the reaction input signal is at the lower part of the membrane and the push rod is also at the bottom, while the positive input signal is at the upper part of the membrane and the push rod is at the bottom.