Control valve opening degree
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For a certain air valve control valve, with an air pressure of 0.8 Kg/cm^2 acting on the diaphragm, what is the opening degree of this control valve? How is it calculated?
You need to know the elastic coefficient of the diaphragm in the membrane head
Why do you check the pressure to determine the opening degree of the control valve? Why not look at the route signs?
0.2 kg/cm^2---1.0 kg/cm^2: The corresponding travel (opening degree) of the pneumatic signal is 0--100%.
I checked the information, and it doesn’t match; it says the opening degree is 25%
What coefficient? Could you give me a formula?
This depends on the pressure range of the air supply downstream of the pressure regulator in the control valve; for some valves, it is 20–280 KPA, while for others it is 20–100 KPA.
It might not be a linear valve; it’s probably an equal percentage valve?
Generally, the membrane head wind pressure ranges from 0.2 to 1.0, corresponding to a valve opening degree of 0 to 100%; on a linear scale, this corresponds to 75%