Can an electric control valve regulate flow when the pipeline is open, and at the same time function as a shut-off valve when the pipeline is closed?
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Can an electric control valve regulate flow when the pipeline is open, and at the same time function as a shut-off valve when the pipeline is closed?
There should be no problem; this is how I use it.
No, because the function of an electric control valve is to regulate flow, and it lacks a shut-off capability. The leakage rate of an electric valve depends on its leakage class. And the shut-off valve has zero leakage. Therefore, electric control valves cannot replace emergency shut-off valves as stated on Baidu.
No, it depends on the degree of sealing and the operation time.
In principle, it is possible. Front and rear valve assemblies are generally used instead of simple control valves: 1. The main function of a control valve is to regulate flow, so its leakage level is not high (lower than that of a shut-off valve) ； 2. In situations with a large pressure difference between the front and back, the erosion of the sealing surface by the leaking medium will affect the regulating performance ； 3. The design of a three-valve assembly is not only intended to facilitate maintenance ；
The leakage rate of the control valve is high; it can be used if low requirements are placed on leakage when shutting it off.
It depends on the internal leakage of the control valve; if there is no leakage, it’s fine. If there is a manual valve, it can also be used to shut it off.
After the control valve is closed, there is still a certain amount of leakage, so it cannot be used as a shut-off valve.
It can be used as a cut-off valve! An electric control valve regulates the valve opening by means of motor rotation and PID signal transmission! A fully open or fully closed valve is a shut-off valve; one that controls the degree of opening of the valve by inputting a percentage value is a control valve!
Then when you place the order, tell the manufacturer that a leakage rating of six is acceptable for you.
It’s acceptable if the tightness meets the expected standards