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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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Guru
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#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?

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Guru

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#2

Re: Valves Selection

12/15/2011 8:14 AM
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Guru
Engineering Fields - Mechanical Engineering - New Member India - Member - New Member

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#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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