Leakage Class Test for Control Valves

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Anonymous Poster	Leakage Class Test for Control Valves 07/21/2010 3:48 AM
	Dear All, I have recently repaired a globe valve of 1" size. Now I need to check the leakage class test for the valve. It's inlet pressure is 16 Kg/cm2 and normal delta pressure across the valve is 6 Kg/cm2. I want to use the air bubble test to check the leakage class. Kindly advice at what pressure should I check the leakage class? Or in other words what is the standard procedure to check the leakage class? Regards
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arthurzhuo Commentator Join Date: Jun 2010 Posts: 61	#1 Re: Leakage class test for control valves 07/21/2010 4:43 AM
	Are you a valve manufactory?Or the user?
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JCS Associate Join Date: Jul 2010 Posts: 50	#2 Re: Leakage class test for control valves 07/21/2010 5:50 AM
	API 598 Defines the Valve Testing Requirements and Acceptance Criteria - for your answer please refer.
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mohitjainindiaagra Participant Join Date: Jul 2010 Posts: 2	#3 Re: Leakage Class Test for Control Valves 07/21/2010 11:00 AM
	u will go for API 598. Since u repaired a control valve , it has a tag plate too...... u can check over there with manufacturer warranty etc.....
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srini Power-User Join Date: Mar 2008 Location: Houston, Texas Posts: 101 Good Answers: 6	#4 Re: Leakage Class Test for Control Valves 07/22/2010 8:16 AM
	You said it is a control valve. So follow ANSI/FCI 70-2 "Control valve seat leakage" Similar to IEC 60534-4 Class IV leakage allows 0.01% of valve capacity and class III allows 0.1% of valve capacity. If you have soft seat you can try to meet class VI leakage rate which is the tightest. You can use clean water at 3-4 barg on the normal inlet side with valve closed and measure the leakage thru the valve __________________ If you don't know where you are going,you are bound to get there
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