Electrically-Actuated Butterfly Valves

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dhanya Active Contributor Join Date: Nov 2009 Posts: 16	Electrically-Actuated Butterfly Valves 03/18/2010 8:25 AM
	Hi. Kindly advise in the operation of butterfly valve - electrically actuated. Our requirement is to open the valve in 60sec and to close in 600sec. Whether it is possible to set two different timings for open and close of valves. If so, how can this be done?
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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: 32175 Good Answers: 839	#1 Re: Different operation pattern of valves 03/18/2010 8:29 AM
	If the valve were to be pneumatically-operated, the solution would be to install a restriction on the air line to the valve, and a different, smaller, restriction on the exhaust port. What size is this 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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dhanya Active Contributor Join Date: Nov 2009 Posts: 16	#2 In reply to #1 Re: Different operation pattern of valves 03/18/2010 8:41 AM
	Thanks for the reply. The subject valves are electrically operated. The size of valve is 500mm. This valve is served as a bypass valve . So during the shutdown process the opening has to be done in 60sec and closing in 600sec. This is designed so as to avoid the surge.
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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: 32175 Good Answers: 839	#3 In reply to #2 Re: Different operation pattern of valves 03/18/2010 9:15 AM
	What make and type of actuator is on it, and what does the manufactuer's literature have to say on the topic? __________________ "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: 42355 Good Answers: 1693	#4 Re: Different operation pattern of valves 03/18/2010 9:51 AM
	Depending on the controller, it should be a simple matter to program different rates of open and close.
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#5 Re: Electrically-Actuated Butterfly Valves 03/18/2010 12:34 PM
	For the slower rate, you could put a repeat-cycle relay of say on-time 2 seconds, off-time 18 seconds. Motor speed would remain the same, but overall time can be made as desired. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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dhanya (1); lyn (1); PWSlack (2); Tornado (1)

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