Open or closed bonnet?
Open or closed bonnet?
(OP)
Can anyone tell me if a bellows PSV with a vent pipe is classed as an OPEN or CLOSED bonnet valve?
Kind regards
Kind regards
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RE: Open or closed bonnet?
The general understanding in my personal opinion (not refering to any standard):
Open bonnet: any bonnet that will expose /let (leaking) fluid (from stem sealings) or other sources escape to the surroundings.
Closed bonnet: any bonnet that under normal operational conditions will keep the fluid inside the valve or bonnet, even if stem sealings etc. are defect.
A bonnet with a vent hole is then not a closed bonnet, if the vent hole is not properly (permanently?) sealed, and constructed to be sealed under all operational conditions.
RE: Open or closed bonnet?
RE: Open or closed bonnet?
RE: Open or closed bonnet?
But then i couldn't find the thread and thats why i asked here.
It seems people really do have different opinions on this and well, we can't all be right can we.
Some seem to think its open, some closed.
http://www.eng-tips.com/viewthread.cfm?qid=371618
Thanks