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Old 18 January 2018, 04:44   #1
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Pressure Relief Valves, what do you think?

I am considering putting some pressure relief valves (PRV) to my RIB, why? Well it is stored outside so I am a bit twitchy about the tubes, which hold air remarkably well for a boat of it's vintage, over-expanding following being topped up after extended periods in the cold north sea.

Good idea or just something else to go wrong?

What are your experiences, I would like to have some thoughts before the Stanley knife comes out!

Thanks

duo-divers.com
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Old 18 January 2018, 04:57   #2
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they are a good thing if you have them, i dont currently have them on my sib i just keep my pressure down a bit to allow for expansion. in hot weather i nip down and let a bit out and leave the dust caps off which is the secondary seal never had a problem.
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Old 18 January 2018, 05:04   #3
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Leaving the dust caps off, now there's a thought!
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Old 18 January 2018, 05:14   #4
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Not sure why leaving the caps off would help, anyway when you leave your rib, just let a little air out to allow for temperature fluctuations - unless you turn up on a hot day you will be getting your pump out anyway. Save your money gets my vote.
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Old 18 January 2018, 08:20   #5
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Leaving the dust caps off, now there's a thought!
In my expeariance especially as the valves get older and bits of dirt can get on the valve seal they weep a bit the dust caps can be cleaned easily so the o ring seal is very air tight and the secondary seal hand books state to keep the dust caps on for air tightness. I keep my boat covered so no debris get in to an open valve
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Old 18 January 2018, 09:41   #6
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Funny that ,quite often when i have seen ribs for sale ,i have seen written ..."Tubes hold air perfectly ,never had to put any in since i have owned it "
made me always think ,manufacturers apply a mid pressure at a mid temperature so damage could be avoided either way ,.........i have a hypalon rib in my garden bought from a very profesional uk rib tender manufacturer summer last year ,i noticed tube pressures were firm when i got it and seem acceptable even in current winter weather so assumed this was "way to go"
anyway those valves let it out but they hav,nt worked a way of putting it back in yet , whats the point i reckon the worst case scenario is towing a deflated rib down the road ,seems to allow exageration of weight on seam and fixing bonds
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Old 18 January 2018, 09:43   #7
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Originally Posted by rnwright1969 View Post
I am considering putting some pressure relief valves (PRV) to my RIB, why? Well it is stored outside so I am a bit twitchy about the tubes, which hold air remarkably well for a boat of it's vintage, over-expanding following being topped up after extended periods in the cold north sea.
Thanks

duo-divers.com
Your Up Norf!, The air and the sea are just as cold
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Old 18 January 2018, 10:02   #8
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If you can afford it and the Boat is worth it...Why wouldn't you have them?..might be a better question
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Old 18 January 2018, 10:53   #9
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If you can afford it and the Boat is worth it...Why wouldn't you have them?..might be a better question
^^^^this

Had rib with and without them, I think I've put the pump on my ribcraft maybe 5x since I bought it as the auto valves let out in hot weather and when winter ones round it needs topped off again. Without them I just let air out a little before leaving it and never had a problem.
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Old 18 January 2018, 11:16   #10
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OPVs will save your tube in the event of a collision.

Collision can lead to a pressure spike in excess of 13 psi which can lead to a severe blowout.

Not to mention, they're a reliable way to inflate your boat with no gauge. Simply fill until the OPVs pop off.
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