Check Valve

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Anonymous Poster	Check Valve 05/22/2010 2:33 AM
	Can we consider check valve as a isolation valve during operating condition ?
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rahulpshinde Member Join Date: May 2010 Posts: 9	#1 Re: Check Valve 05/22/2010 4:12 AM
	yes you can use it as an isolation valve but it will depend on the application and the fluid. what is the application? what is the type of fluid? __________________ rahulpshinde
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ducon Guru Join Date: Dec 2006 Location: Hop around Toronto, New York & Karachi Posts: 1876 Good Answers: 19	#2 Re: Check Valve 05/22/2010 4:47 AM
	why do you need to consider ? a check is a check to safeguard back-pressure period. Isolation is set of 3 valves/ 2 valves(if a check valve is there) to close and isolate to take off/do maintenance of a say, steam trap, pump, control valve, PRV etc., and temperoray operation with the by-pass. Why complicate yourself unnecessarily. If you consider your check valve as isolation and a new guys come in he might make the mistake of your "consideration". __________________ I not only use all the brains that I have, but all that I can borrow. Woodrow Wilson
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PennPiper Guru Join Date: Feb 2007 Location: Bayonet Point, Florida Posts: 635 Good Answers: 61	#3 Re: Check Valve 05/22/2010 9:53 AM
	"Can we consider check valve as a isolation valve during operating condition ?" No!!!! You cannot consider a Check Valve as Isolation. A Check valve is only capable of flow restriction in one direction. This restriction is not 100 percent. They are, by there design prone to some leakage back from the downstream side to the upstream side. The only true "Isolation" methods for safety are: 1. Two block valves with a removable spool piece. The spool piece is between the two block valves and is fitted with a bleed valve to vent off pressure. The valves are closed, the vent is opened, when safe the spool piece is removed. 2. Double block valves with a Spec-Blind between them. 3. Double Block and Bleed. __________________ Do it once and do it right
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Mikerho Guru Join Date: Jan 2007 Location: Moses Lake, WA, USA, Thulcandra - The Silent Planet (C.S. Lewis) Posts: 4216 Good Answers: 194	#4 In reply to #3 Re: Check Valve 05/22/2010 6:29 PM
	I agree and good answer. __________________ "Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone." - Ayn Rand
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ducon (1); Mikerho (1); PennPiper (1); rahulpshinde (1)

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