Reply
 
Thread Tools Search this Thread
 
Old 10 September 2015, 14:19   #1
Member
 
Country: Croatia
Town: pula
Make: zodiac medline 2
Length: 6m +
Engine: outboard, petrol 150
Join Date: Jul 2012
Posts: 5
pressure relief valv

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!
__________________

__________________
darko1307 is offline   Reply With Quote
Old 11 September 2015, 10:41   #2
Member
 
Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,118
Quote:
Originally Posted by darko1307 View Post
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.
__________________

__________________
Richard
Gluing geek since 2007
office888 is offline   Reply With Quote
Old 11 September 2015, 12:28   #3
Member
 
Country: Croatia
Town: pula
Make: zodiac medline 2
Length: 6m +
Engine: outboard, petrol 150
Join Date: Jul 2012
Posts: 5
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.
__________________
darko1307 is offline   Reply With Quote
Old 11 September 2015, 13:33   #4
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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
__________________
jyasaki is offline   Reply With Quote
Old 11 September 2015, 14:20   #5
Member
 
chipko's Avatar
 
Country: UK - England
Make: XS500
Length: 5m +
Engine: Mariner60 Honda2.3
MMSI: 239711398
Join Date: Sep 2013
Posts: 392
pressure relief valv

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.
__________________
chipko is offline   Reply With Quote
Old 11 September 2015, 15:06   #6
Member
 
Country: Croatia
Town: pula
Make: zodiac medline 2
Length: 6m +
Engine: outboard, petrol 150
Join Date: Jul 2012
Posts: 5
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.
__________________
darko1307 is offline   Reply With Quote
Old 12 September 2015, 07:57   #7
Trade member
 
Dave Cowell's Avatar
 
Country: UK - England
Town: Chorley, Lancs
Length: no boat
Join Date: Apr 2012
Posts: 81
Fit the filter caps if you are worried about dirt clogging it
http://www.leafieldmarine.co.uk/prod...lief-valves/a6
__________________
Retubes and Repairs
www.nwri.co.uk
Dave Cowell is offline   Reply With Quote
Old 13 September 2015, 23:50   #8
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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
__________________

__________________
jyasaki is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 00:09.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.