Can the control valve be used in this way?
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Pneumatic control valves are generally controlled for opening, closing, or maintaining a certain degree of opening using P and T signals. What I want to know is: is it possible to make it reach a specific degree of opening by sending it a direct command signal? This post was last edited by star1215 on 2009-2-4 10:54]
A gas-electric converter can be used, or a pneumatic setpoint regulator can also be used
It’s possible, and that’s usually how it’s controlled
It’s definitely possible, no problem at all. Just provide the percentage of opening, and it can be achieved directly
By setting the regulator to manual mode, it is possible to adjust the valve opening manually.
It can definitely be implemented using the control method you mentioned; any number of valve positions is possible.
On-site, if it is a smart locator, in manual mode of the locator, it is possible to directly control the valve opening degree； In the DCS room, with the regulator set to manual mode, it is also possible to directly control the opening degree of the valves
Does the poster mean to achieve quick opening and closing? You can use an electromagnetic valve together with a positioner
PID operates in automatic mode, while your requirement is to have it function in manual mode.
For ordinary control valves, regulation can be done in either automatic or manual mode~ In manual mode, it is possible to directly enter the percentage of opening for manual adjustment~