Duty of pump

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dhanya Active Contributor Join Date: Nov 2009 Posts: 16	Duty of pump 01/28/2010 3:38 AM
	I have one query related to the duty of pump. The type of pump is VT. While giving the specifications, the vendor for pump has mentioned the duty of pump as on and off. What does that term refer to. Thanks Dhanya.
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dhanya Active Contributor Join Date: Nov 2009 Posts: 16	#1 Re: Duty of valve 01/28/2010 4:01 AM
	Hi. By mistake i have mentioned as pump. I actually wanted to know about butterfly valve. Duty of butterfly valve on off means?
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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	#2 In reply to #1 Re: Duty of valve 01/28/2010 4:28 AM
	<...Duty of butterfly valve on off means?...> Either the valve is fully open, or it is fully shut. __________________ "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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toughguy1 Associate Join Date: Jan 2010 Location: Charleston, SC Posts: 25 Good Answers: 1	#3 Re: Duty of pump 01/28/2010 1:14 PM
	In my opinion, the answer is that the valve is not meant for throttling. A globe valve, for example, can be throttled to a specific GPM, whereas a butterfly is basically used for on/off isolation. __________________ R. Turner, P.E.
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Anonymous Poster (1); dhanya (1); PWSlack (1); toughguy1 (1)

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