Under what circumstances can a bypass be omitted for a control valve? ?
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Under what circumstances can a bypass be omitted for a control valve? ?
No regulations require the use of a secondary line, but in general process design, an evaluation is carried out; for example, such a line is not used in batch processes or under normal operating conditions. In continuous processes, factors such as cost and failure rate must also be taken into account. In short, it is up to the owner to decide
Refer to Article 2 of HG20559, Basic Unit Mode 3.0.1 for Control Valve Assembly, which specifies this clearly
As mentioned on the 2nd floor, it is up to the property owner to decide, but it is recommended to have a bypass; otherwise, repairs will not be possible in case of a malfunction. Of course, if the pipe diameter is large enough, there is no need to consider a bypass.
Why does it not matter to ignore the bypass when the pipe diameter is too large? What size is generally considered too large? Thank you!