pressure relief valv

[darko1307]

Hello

I have Zodiac medline 2, I want to install pressure relief valves on it. Correct pressure is 0.24 bar or 3.5 psi. So what pressure/colour of prv I should install,
white or orange from this chart?

http://www.ribstore.co.uk/cms-assets...urecolours.pdf

Also during winterising I would let them inflated at 50% of max pressure, that is info I read somewhere is that OK?

thanks!

[office888]

Originally Posted by darko1307

Hello

I have Zodiac medline 2, I want to install pressure relief valves on it. Correct pressure is 0.24 bar or 3.5 psi. So what pressure/colour of prv I should install,
white or orange from this chart?

http://www.ribstore.co.uk/cms-assets...urecolours.pdf

Also during winterising I would let them inflated at 50% of max pressure, that is info I read somewhere is that OK?

thanks!

I'd probably do the Red since it is a nominal of 4.0 psi. That way the minimum is still higher than the factory recommend specs, so it actually is an "overpressure valve" not a source of a leak to drain your boat down below 3.0 psi.

[darko1307]

That is what confused me, minimum sealing psi would be pressure when valve stop leak but maximum opening psi is what confused me, is that maximmum pressure where valve relef but that could hapend before on lower psi somewhere betwean 3.48 and 5 psi or is that pressure that must be achived to open valve.*
If it would not open before 5 psi that is to high I would like it open and relief pressure before 5 psi.

[jyasaki]

Maximum opening pressure means that's the guaranteed maximum the valve will retain. It may open earlier, but will not exceed the max. Sort of like if a lumber yard says a board is 6 feet +/- 1". Might be 11' 9", might be 12' 1", but won't be 12' 1.5".

jky

[chipko]

Although not as critical in a rib as a sib, I'd also risk red, orange if nervous. Last thing you want is losing pressure below recommended operating pressure. Worst case red will blow off at 5 psi, slightly lower in reality, and Zodiac test tubes at higher pressures than this anyway.
I had an F-Rib, recommended 0.24 bar operating pressure, with white p.r. valves and would leach pressure down to well below 0.16 bar in a matter of hours - absolute pain in the derrière. Resulted in me eventually returning the boat.

[darko1307]

I'll go whit red ones, if at hottest part of day is at 3,5 psi at morning/night it would be lower. I read on some forums that this PRV can be pain in the a... as they pick dirt and debris and leak. Some of users sad that they can be bigger problem than plus and remove them. Is that true or not?
Pressure for zodiac is 0.24 bar, is that max pressure alowed because if at hottest part of day I put them at 0.24 bar during night pressure drop to cca 0.20 bar, is that OK for night navigation.

[Dave Cowell]

Fit the filter caps if you are worried about dirt clogging it
http://www.leafieldmarine.co.uk/prod...lief-valves/a6

[jyasaki]

If you hit the static pressure recommended (was it 3.5psi in the original post?) and go bashing into waves, the pressure in the tubes is something over 3.5 psi, at least instantaneously. If you go with a 3.5 psi OP valve, you'll find the tubes underinflated after a bit of rough water stuff (which is not exactly the time you want to break out the footpump.)

I'd say you want a bit over the recommended inflation pressure, as the OP valve is a safety feature, not a calibration feature.

jky