valve recognition

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chemengg Active Contributor Join Date: Dec 2008 Posts: 16	valve recognition 01/03/2009 11:17 AM
	can we recognize valves which are already in use in the field by just observing them from outside? if yes, then i would be glad if you could provide me with a few tips good day.
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TexasCharley Guru Join Date: Jul 2007 Location: 30°30'N, 97°45'W, Elv: 597 ft. Posts: 2410 Good Answers: 10	#1 Re: valve recognition 01/03/2009 1:10 PM
	Are you asking if you can determine whether a particular valve is a bonnet, diaphragm, butterfly etc? Or are you asking whether or not a particular valve is in an open or closed postion. __________________ I never apologize. I'm sorry that's just the way I am.
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PennPiper Guru Join Date: Feb 2007 Location: Bayonet Point, Florida Posts: 635 Good Answers: 61	#2 Re: valve recognition 01/03/2009 3:21 PM
	Chemengg, Yes you can if you do a little bit of home work first. Go to "Google" and type in the name of various valve types. "Gate Valve", "Globe Valve", :Butterfly Valve", "Check Valve", etc. Pick a link that has pictures. Study the pictures and print them out. Take the print-outs to the field and use tham as an aide. Each valve type has its own distinctive features and after a while you will be able to recognize most all of them. With some of the valves you will also be able to tell if the valve is open or closed. __________________ Do it once and do it right
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smkajith1985 Member Join Date: Dec 2008 Posts: 6	#3 In reply to #2 Re: valve recognition 01/04/2009 8:16 AM
	Hi Chemengg, You can recognize the valve type and sometimes the valve Fail action by using the pictures from 'Google'. It is not possible to say whether the valve is in good operating conditions without having a look on the valve internals(Trim parts). Also most valves looking similar outside have different internals depends on the process requirement. To recognize a valve in good condition or not we have to consider the Internal parts also.
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babybear Guru Join Date: Jun 2008 Location: USA/Europe Posts: 4547 Good Answers: 68	#7 In reply to #2 Re: valve recognition 01/07/2009 10:35 PM
	Hello PennPiper: I have given you a GA. Your explanation was obvious, but, you made a subject which could have gotten complicated, simple! Thanks. A small credit card sized example of open and closed valves. This is something I feel would be useful for all liquefied gas and petroleum, and other dangerous substance workers. Including of course Fire and safety teams. Or has it already been done? If not they can call it after me! Take care and have a great new year..................... __________________ Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=$=\|O\|=$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
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pipewelder Guru Join Date: Apr 2007 Location: North Georgia, USA Posts: 671 Good Answers: 33	#4 Re: valve recognition 01/04/2009 8:32 AM
	Most valves have a spec tag on them all though some may not be very readable. I would first look for this tag to eliminate any guessing until you have more experience identifying valves from sight. I can usually identify whether a valve is a ball, gate, globe, butterfly, knife gate etc by just looking at them but I have been looking at them for 30 years. Every once in a while I will run across a full port ball OR a V-port knife gate that stumps me. The best way as already stated is to study the pictures and learn the characteristics. Another thing you can learn is how to identify the material of the valve from the casting markings on the the valve body such as WPB for carbon. You can usually find out how the different valve material is identified by going to some of the manufacturers' websites and reading how they mark them. __________________ pipewelder
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TexasCharley Guru Join Date: Jul 2007 Location: 30°30'N, 97°45'W, Elv: 597 ft. Posts: 2410 Good Answers: 10	#5 In reply to #4 Re: valve recognition 01/04/2009 9:00 AM
	Absolutley. Identify the valve by their markings, crossreference to manufacturer. Never assume that because two valves are similar in appearance that they are the same. This is especially true as sizes and/or manufacturers vary. A large gate valve might appear very similar to a smaller butterfly etc. Take the time to do things right. __________________ I never apologize. I'm sorry that's just the way I am.
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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	#6 Re: valve recognition 01/06/2009 9:08 AM
	Using the tag number, from the P&ID, look-up the maintenance records for a particular 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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