Service valves
 
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Old 08-12-2009, 09:28 PM   #1
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Service valves

What do you use to seal the cap on a sevice valve?

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Old 08-12-2009, 09:44 PM   #2
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Re: Service valves

If it is a brass cap on a brass valve it should have a knife edge on the valve and 99.5 % of the time if tightened carefully they will mate and seal. The rest of the time I use nylog:http://www.acsource.com/index.asp?Pa...ROD&ProdID=185

It never hardens and you wind it around like a string on the threads.
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Old 08-12-2009, 11:34 PM   #3
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Re: Service valves

I find more often than not they seal well when they are clean. I have used the nylog gel when there seems to be an issue.
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Old 08-13-2009, 10:32 AM   #4
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Re: Service valves

Quote:
Originally Posted by plumber101 View Post
What do you use to seal the cap on a sevice valve?
The brass caps seal quite well when done correctly. (clean cap, finger tight + one flat worth of extra turn)
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Old 10-18-2009, 12:07 PM   #5
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Re: Service valves

refrigerant oil although it is hyroscopic and can eventually pick up some moisture
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Old 03-15-2010, 12:49 AM   #6
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Re: Service valves

I'm always finding trace leaks under service valve caps. I used to always seal the threads with leak lock and tighten 1/12th of a turn tight. Now I notice alot of manufacturers are using a rubber gasket, under the brass caps, to prevent the leaks.
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