JJCCR Exhale lung OPV alternative?

[Markus MDDT]

There are different styles of OPV on the exhale lungs on Meg, XCCR, Divesoft, JJCCR Optima. Since I dive with the JJ there is a valve with a pull cord, non adjustable. Cord gets stuck during splash, Very thick gloves, breaking cord, These issues might be an inconvenience if bailing out. (im aware of mitigation dumping through mouthpiece) Those of you who dive the other machines with adjustable OPV, Is there a significant advantage of having an adjustable OPV on your lung? Does it help during normal diving or is it just a bit easier during bail out ascent? Curious whether this is an issue at all really?

 

[Snusmumrik]

IMHO - that's nonsense that someone install non-adjustable OPV on rebreather.
I know man that got rapid uncontrollable ascent due to stuck pull-style OPV. And to deal with this ascent consequences (missed 30 minutes deco) he got IWR on O2.

 

[DiveLikeAMuppet]

I’ve been taught to dump through mouthpiece on bailout. Dump through OPV on exhale counterlung during a dil flush.

You can replace the string and make it just a little bit shorter if that helps.

 

[mr_v]

I have a non-adjustable OPV. During a typical ascend, I'll let gas escape through the mouthpiece. In a BO ascend, I'll ride the OPV, then burp the loop. No issues or inconveniences.

If I had an adjustable OPV, I'd probably do the same thing, as it is better to have full control on ascend.

 

[211ratsbud]

I would love a OPV with a mushroom valve to be commercially available

 

[justinthedeeps]

A hands-free option to let gas out on OC ascents, simply by lifting the hip/rear?
Sounds easy enough to test out

What measure is the JJ CL dump valve threads?

 

[rjack321]

There are different styles of OPV on the exhale lungs on Meg, XCCR, Divesoft, JJCCR Optima. Since I dive with the JJ there is a valve with a pull cord, non adjustable. Cord gets stuck during splash, Very thick gloves, breaking cord, These issues might be an inconvenience if bailing out. (im aware of mitigation dumping through mouthpiece) Those of you who dive the other machines with adjustable OPV, Is there a significant advantage of having an adjustable OPV on your lung? Does it help during normal diving or is it just a bit easier during bail out ascent? Curious whether this is an issue at all really?

I kinda a change the tension on my Meg OPV during ascent. Not sure it matters

I keep my KISS OPV cranked as tight as it goes and only vent through my nose

 

[justinthedeeps]

I think the OP might be talking about options under bailout scenarios, like being able to just tilt-dump hands-free, rather than pull a [possibly missing] cord, or manually vent a closed bailed out loop?

 

[rjack321]

Does it help during normal diving or is it just a bit easier during bail out ascent? Curious whether this is an issue at all really?

I think the OP might be talking about options under bailout scenarios, like being able to just tilt-dump hands-free, rather than pull a [possibly missing] cord, or manually vent a closed bailed out loop?

Waiting until the OPV decides to dump a random amount of gas from a very full & buoyant bailed out loop seems like a way to have a very rocky BO ascent. Stay on top of it by manually venting

 

[Snusmumrik]

Waiting until the OPV decides to dump a random amount of gas from a very full & buoyant bailed out loop seems like a way to have a very rocky BO ascent. Stay on top of it by manually venting

So, you must throw away your drysuit's OPV.
Waiting until the OPV decides to dump a random amount of gas from a very full & buoyant drysuit seems like a way to have a very rocky BO ascent.