flow control philisophy
flow control philisophy
(OP)
Hi, i am curious to know why some seal gas flow control design have an orifice in parallel to the valve ?
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RE: flow control philisophy
RE: flow control philisophy
Given the valve is a FO design, indicates that excess flow or pressure is not a big issue, but low flow / pressure in.
I've seen this also done by mechanically limiting the control valve to a certain limit of closure.
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RE: flow control philisophy
RE: flow control philisophy
RE: flow control philisophy
Downside is it will not seal shut, but neither did the orifice.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: flow control philisophy
Best regards, Morten
RE: flow control philisophy
RE: flow control philisophy
When the control valve is FC, the bypass RO may enable seal gas flow at a controlled rate for some time when there is a general plant power failure and the instrument air supply pressure has dropped off rapidly. When seal gas flow / pressure has also dropped off, the compressor should be auto depressured ( if it hasnt already by this time).
You could probably achieve the same result if you had the dPCV fitted with a min stop (either mechanical min stop or soft stop in DCS may do).