Valves Selection

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Ahmadnaggar Active Contributor Join Date: May 2011 Posts: 17	Valves Selection 12/15/2011 4:24 AM
	Dear all Kindly I have to select a valves will erected in vacuum possibility areas .is it will be the same specs for valve in normal place (no vacuum possibly)? Please advise
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 31075 Good Answers: 826	#1 Re: Valves selection 12/15/2011 5:45 AM
	Due allowance needs to be made for the pressure difference between that at sea level and that at absolute vacuum in the rating of the valves. For example, if the line is pressurised at 10barg max, and the surround is 0bara, then the pressure difference that the system "sees" is 11bar or thereabouts. If the valves are located in a vacuum, then how do they get operated? Why is there a need to put the valves in a vacuum at all? How does anyone gain access to maintain the valve? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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lyn Guru Join Date: Oct 2008 Posts: 42367 Good Answers: 1672	#2 Re: Valves Selection 12/15/2011 8:14 AM
	[PDF] VACUUM SERVICE & HIGH PURITY APPLICATIONS
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pritam Guru Join Date: Aug 2008 Location: City of destiny, INDIA Posts: 775 Good Answers: 67	#3 Re: Valves Selection 12/27/2011 3:29 AM
	How much vacuum? Vacuum service valves are specialised ones but if your vacuum is just a few torrs below the ambient you can use normal specs for valve.
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lyn (1); pritam (1); PWSlack (1)