Does the electric control valve have a shut-off function?
Thread Content
I would like to ask manufacturers or experts in the field of electric control valves: can an additional interlock signal be connected to the actuator of an electric control valve? Can this feature be implemented?
The main function of a control valve is to regulate flow; it cannot meet sealing requirements when shut off.
Electric control valves are used as shut-off valves; firstly, they cannot ensure a low leakage rate, and secondly, the time it takes for such valves to switch from open to closed is too long, which does not meet the process requirements
Sure, the electrically adjustable actuator is equipped with a limit switch; by obtaining this signal, it is possible to control the shut-off valve.
There should be a cutting function, but the cutting speed may not meet the requirements
Electric control valves have shut-off capability and can be used as process shut-off valves. However, due to different initial design purposes, control valves should not be used as safety shut-offs. First, due to the issue of the actuator force, control valves do not inherently provide sealing after being closed ； Second, there is no guarantee regarding execution time ； Third, regulation combined with shut-off means that the regulation process can damage the valve seal, thus failing to ensure a proper shut-off.
When the hazard level of the medium is not high, it can be used as a shut-off device; however, the sealing performance of control valves is not very good. In the case of hazardous media, it is recommended to use emergency shut-off valves~~
Yes, electric control valves are primarily used for shut-off valves
I have used control valves with a shut-off function, but it’s not a rapid shut-off – it only ensures that the flow is stopped!
The closing time of the electric valve is too long; it does not meet the requirements for a shut-off valve (quick shutdown within 5 seconds)
The reply from the 3rd floor is absolutely correct!