Can an automatic control valve be connected directly to the manual valves at the front and back? What are the advantages and disadvantages of not using a short circuit?
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Usually, when installing an automatic control valve, a valve assembly is set up, along with manual valves and bypass lines before and after it, to facilitate maintenance. Can the manual valve be connected directly to the automatic valve? Is there any impact? Install with a short circuit
It must meet the requirements of the instruments to facilitate maintenance.
If connected directly, there is a risk that the unstable flow regime may affect the flow control performed by the control valve.
A short-circuit connection needs to be installed. In addition to the reasons you mentioned, this short-circuit connection allows for the use of brackets to support the valve; moreover, a drainage device must be installed on it so that the liquid between the valves can be drained during maintenance
A shortened version should be installed for easier operation
Why is the fluid flow regime unstable?