Tight shutoff in control valves
Tight shutoff in control valves
(OP)
Hi Gentlemen,
Can we know whether tight shutoff is required before sizing a control valve?
thanks
Can we know whether tight shutoff is required before sizing a control valve?
thanks





RE: Tight shutoff in control valves
RE: Tight shutoff in control valves
RE: Tight shutoff in control valves
RE: Tight shutoff in control valves
However, Shutoff in service is seldom 50 psi. It is not correct to directly extrapolate the "test" leakage to the installed condition. Prudent practice is to provide an on-off isolation valve and a modulating control valve.
RE: Tight shutoff in control valves
RE: Tight shutoff in control valves
Philosophy around here is a control valve is for 20-80% and its tandem iso valve is for 0%.
In my naivete I thought that was the only way to go.
As an aside what if you find the iso downstream of the CV, what are the practical adversities?
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