Pneumatic control valve regulation
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This post was last edited by ZuoQiangDengTaiHongXing on 2018-3-21 at 10:39. How can the opening degree of a control valve be controlled when there is no AI signal in the range of 4-20mA, such as flow rate or pressure?
Most pneumatic control valves are remotely controlled, but some also have a manual function.
There is something called a signal generator; some expensive multimeters also have this function
According to process control, there is a manual control valve that has no control variable, but can be remotely controlled manually via 4-20MA in the absence of an input signal. Manual control is also possible