Poseidon BOV questions

[Cio]

I bought a used Poseidon BOV and have a few questions for you owner operators.

Can I buy some poseidon loop hoses and use the fittings from them or are they an assembly ( and I need to get the adaptor from tecme )?
It has a 9/16" adaptor on it, do I need an OPV on the 1st?
Where can I get a full service kit? I see xstream kits, and some other parts but no kit for the BOV?

 

[happy-diver]

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[JackZwykle]

You didn't say use for what. Most likely you will need some kind of an adapter, depending on the unit you want to install it on.
tekme is the best place to look (or print your own).

9/16 connector on it is for the BO/ADV reg inside - yes you need an OPV on the 1st.

I haven't seen the service kits available. I service mine with the dealer - I would recommend the same, at least in the beginning. I think they need some special tools, although not 100% sure about it, talk to your nearest dealer, I'm in the EU and it's easier for me.

An important point - it's not just a BOV. It's a BOV/ADV.
Something I would recommend if you're ok with shutoffs in general - is putting one right at the 9/16 connector. This BOV doubles as the ADV and in normal setting it's enough to look even slightly down and it will blow up your loop if you have BM CL.
At the very best it's annoying and wastes the dil, at worst in some pinch it might start a chain reaction and pull you up.
You need to include the shutoff operation in your S drill, as I've seen someone BO and then grow big eyes and almost panic as they forgot about the shutoff.

But overall I love this BOV, how small, light and streamlined it is, angle of the loop connection, the fact that in a pinch it doubles as the ADV and when it does - it blows the gas straight into your mouth. Very useful for loop flush with no hands.
I am connecting my stage to it using QC6 instead of dilout, gives me more peace of mind in case of CO2 hit, but it's not common practice.

Dislikes - some were released with leaks from factory and need a rebuild by the dealer, a simple service won't help. I hope yours is not one of those. Also without the shutoff it basically blocks you from looking down or any head-down position or it will blow your CL up and pull you out.

 

[Cio]

You didn't say use for what. Most likely you will need some kind of an adapter, depending on the unit you want to install it on.
tekme is the best place to look (or print your own).

Loop connectors. I'm pretty sure I cannot, but wanted to ask if I could disassemble the Poseidon ones. No 3D printing for me.

An important point - it's not just a BOV. It's a BOV/ADV.
Something I would recommend if you're ok with shutoffs in general - is putting one right at the 9/16 connector. This BOV doubles as the ADV and in normal setting it's enough to look even slightly down and it will blow up your loop if you have BM CL.
At the very best it's annoying and wastes the dil, at worst in some pinch it might start a chain reaction and pull you up.
You need to include the shutoff operation in your S drill, as I've seen someone BO and then grow big eyes and almost panic as they forgot about the shutoff.

I appreciate the user review, but I hate the idea of a shutoff on a BOV. I was attracted to this BOV because the "patented" mechanism that should increase the pressure required for ADV activation. By the looks of the throw vs diaphragm size, I would assume it would get much harder to trigger, it is disappointing to hear this does not work as intended.

Dislikes - some were released with leaks from factory and need a rebuild by the dealer, a simple service won't help. I hope yours is not one of those. Also without the shutoff it basically blocks you from looking down or any head-down position or it will blow your CL up and pull you out.

Thanks for the heads up, this one does not look used so I'll keep an eye out for it.

 

[rjack321]

9/16 connector on it is for the BO/ADV reg inside - yes you need an OPV on the 1st.

If the IP goes sky high on the 1st the BOV is going to vent that gas, the OPV is just another place to leak.

 

[JackZwykle]

If the IP goes sky high on the 1st the BOV is going to vent that gas, the OPV is just another place to leak.

I think you have a faulty OPV - get it replaced. The whole idea is that it vents BEFORE the BOV/ADV blowing into your loop. I had an old 1st on another unit, pressure drifting up and the OPV was letting the overpressure out without any gas release anywhere else.

 

[JackZwykle]

I appreciate the user review, but I hate the idea of a shutoff on a BOV. I was attracted to this BOV because the "patented" mechanism that should increase the pressure required for ADV activation. By the looks of the throw vs diaphragm size, I would assume it would get much harder to trigger, it is disappointing to hear this does not work as intended.

Yes, I know that there are two schools on shutoff, just giving you my experience. I absolutely get the logic behind avoiding them.

About the pressure "block" on ADV - maybe it's patented, but I have no idea how it's supposed to cheat physics. With BM you create 20-30cm of water column pressure differential (suction) just looking down a bit, up to about 50cm when inverted. That's a lot of pressure that cracking resistance would have to block, whatever the diaphragm size. Of course you can set the cracking pressure so stiff that it won't happen when inverted, but gods help you breathing from it when on BO (it's the same reg!).
Actually even ADV would be badly affected as it would be extremely hard to use it (and this BOV is designed as the only ADV on Se7en).

Me and my wife - we went through 6 of those in total due to certain circumstances and warranties and so on - and I can tell you that with BM ALL of them triggered and quite easy when having a breathable cracking pressure set on them for BO.

Sadly that BOV doesn't have a handy manual cracking pressure adjuster, that would've solved the problem for BM.

Important note - it should not happen for FM/CM (you have slightly positive pressure in the mouthpiece and the problem disappears, it's only there for BM/OTS).

Try it out, let us know what you think about it.

 

[rjack321]

I think you have a faulty OPV - get it replaced. The whole idea is that it vents BEFORE the BOV/ADV blowing into your loop. I had an old 1st on another unit, pressure drifting up and the OPV was letting the overpressure out without any gas release anywhere else.

OPVs are the single most likely failure point in scuba. It's a tiny, tiny bit of nylon the size of a pinhead behind a SS spring - all exposed to salt, seawater, and HP O2. They fail - more often than nearly any other regulator part