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Old 05-01-2013   #1
goldcamp's Avatar
Golden, Colorado
Paddling Since: 2005
Join Date: Aug 2006
Posts: 337
leaky valve

I have a leaky valve on the floor of my raft. I've taken it off and reattached it several times but still get a little leaking around the outside of the valve. I think its leaking between the valve and the pvc. I've though about using some glue to seal the outside of the valve to the pvc but I'm worried that then I will never be able to take off the valve again. Thoughs on how to fix this?

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Old 05-01-2013   #2
Conifer, Colorado
Paddling Since: 1998
Join Date: Dec 2009
Posts: 61
I use a little 100% silicone on my old military valves because it remains pliable and does not harm my the hypolan. I test it with low pressure right away so if it does not seal I can wipe it off and re screw in the valve.

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Old 05-01-2013   #3
goldcamp's Avatar
Golden, Colorado
Paddling Since: 2005
Join Date: Aug 2006
Posts: 337
Once you use the silicone can you still crack the seal and remove the valve then just scrape and redo the silicone?
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Old 05-01-2013   #4
Conifer, Colorado
Paddling Since: 1998
Join Date: Dec 2009
Posts: 61
yes. I don't think it penetrates the fabric/rubber or adheres to the metal of the valve. It just takes up space for a gasket like effect.

I think glue should be a last resort not sure how it will react with PVC/plastic of your boat.

I have an old air with B7 valves. The PO (an outfitter) glued in the floor one, I am just praying that it does not fail because it is not going to be fun to try to repair.
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Old 05-01-2013   #5
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Grand Junction, Colorado
Paddling Since: 1978
Join Date: Mar 2008
Posts: 523
Something I encountered with C7 valves on an NRS Bandit with PVC-like material: If you notice, the upper and lower sections of the valve have ridges that are designed to compress into the fabric slightly from above and below to create a seal when the valve is screwed down tightly onto the fabric. The thin material of the Bandit (good boat, just has this characteristic) stretched a bit so the round-cut hole that the valve fits into got slightly oblonged. I had a small leak and removed the valve to inspect it. But because the hole was oblonged a bit, this meant that when the valve was re-attached and screwed down tightly again, the ridge-marks in the fabric did not line up perfectly again with the ridges on the hard plastic valve parts, thus perfect seal was lost. I.e., once the valve has been removed, it could be that it is not lining up again in the same place for those ridges to take affect. That and look closely, making sure the fabric is completely clean and smooth inside and out. Like water, air will find its way through tiny seeps if they are there, so even some grit could ruin the seal. I was eventually able to get mine tight again with no leaks, but it took several tries and I really had to tighten the valve down hard. If all else fails, silicone sounds like a good option. Good luck.
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