Sequence of opening and closing the manual valves before and after the control valve
Thread Content
I would like to ask about the sequence in which the manual valves before and after the control valve should be opened and closed, as well as the reasons for this
First, open the hand valve behind the control valve, and then open the hand valve in front of the control valve. This prevents a sudden increase in pressure of the medium in front of the control valve, thus protecting the control valve from damage. The shutdown sequence is reversed: first close the manual valve before the control valve, and then close the manual valve after the control valve, to ensure that the control valve is under no pressure. .