Regulation method of pneumatic control valve
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Zeroing a pneumatic control valve also involves adjusting the distance between the baffle and the nozzle, right? Generally, I set the valve to manual mode and then zero it out; if there is no noticeable movement of the valve stem, I adjust the constant orifice ； Then adjust the zero point and range
The valve positioner is equipped with zero and range adjustment mechanisms, which should be adjusted as required.
Just adjust it according to the instruction manual.
I usually follow the instructions
It is the positioner and electrical converter that adjust the distance between the baffle and the nozzle, while the control valve is used to adjust the valve stem and spring.
Indeed, the control valve adjusts the zero position of the valve core by changing the connection point between the valve stem and the actuator push rod (to ensure a reliable closed or fully open position), and it uses adjustment springs to ensure the correct stroke.