Quote: (Originally Posted by
bletso)
That is why I got rid of my stock OPV and replaced it with a very stiff OPV from a BCD. It prevents the CL's from blowing apart at the seams if I should neglect to shut down the O2 bleed. I just vent though my nose.
Since I did that, I have not had any of the previous issues of unexplained water content in the loop.
Dale
Hi
This OPV talk is perhaps expanding off topic, so perhaps its time for a dedicated thread?
Anyway, I have also thought about using a BCD OPV instead (of course removing any eventual toggles or things that can be used to pull it). It should also protect against the possibility of an ordinary dry suit type OPV to slowly flood if inadvertedly pushed in by some object. I had a dry suit type OPV partially flood one of my sling Rebreather because of this. Also had things pushing on the OPV of my CK making the unit temporarily go open loop due to gas dumping (no flooding though, despite the top OPV position)
If going for a BCD OPV I would prefer to get one with double membranes, I think AP valves (Buddy) uses dual serial membranes in some of their dumps?
And to make some sort of assement of if or how much larger the risk of embolisms becomes on rapid CC-ascents with nose/mouth venting. Or the risk of bursting the loop in OC ascents. On loops with more variable volume I would definately be worried of run away ascents (not on the CK).
The Viking X2 dry suit dump valve could also be worth mentioning:
http://www.trelleborg.com/protective...03-04%20EU.pdf
Only trouble with the X2 (apart from the higher price) is they use a different hole/thread compared to the more common Sitech/Apeks type ones. So retrofitting one could be tricky on a Rebreather unless there is space for some adapter (I know there are adapters/rebuildkits to mount them on suits made for other valves).