My new G250Vs and ramblings

[MichaelMc]

Easy to check, look through side of exhaust cover, you'll either see a blue valve or a clear one.

My G250V has a clear exhaust valve, and no wet breathing I've noticed in five dives.

 

[rhwestfall]

Nice Simon!

 

[Couv]

Very nice, and very happy for you.

I cannot initiate violent free flow with viva on max on either one, I know all the previous ones I made did coz it's one of the final tests I do. What's happened? I tried flipping the flow vane a la G250HP so crescent was facing back of diaphragm, same result, zero free flow.

Try with the mouthpiece removed.

 

[buddhasummer]

Very nice, and very happy for you.



Try with the mouthpiece removed.

Thank you.

I did.

All the ones I made and sold would violently free flow with viva on max, only difference between those and the two I made for me is my usage of a .218 spring.

 

[buddhasummer]

Gorgeous set up! Thanks for this thread, it would be good to get an overview of parts availability for the G250V.

I recently got my hands on a pair, and the built quality was a revelation. Taking it apart and replacing the o-rings and poppet is so quick that I can't see the need for a floating seat-saver orifice (if you DIY service, that is). The thick housing, the coarse threads, the full length valve barrel, the chunky halo jam nut, all make this reg a real workhorse. I still have to try the G260 (just have not found an affordable one when I had some funds), but I assume it is as robustly built. I am actually also delighted to see that the S620ti is built with similar simplicity compared to the balance chamber of S600 versions (just wish the S-series had less cosmetics on it).

The S620ti will go into venturi freeflow on the surface, but my G250V will not. My Atomics, even with the venturi "tricked" into max on the surface*, will usually not. The D400s I tried to set up as sensitive as possible would also not freeflow. I do like strong venturi though.

So we have 3 G250Vs in this thread that won't freeflow. Perhaps a desirable quality for cave and tech divers. My question is if this is intentional on the G250V. I'd assume even with the same lever and orifice travel, the venturi vane shape may be sufficient for such changes.

*(on my primary Atomic that is in my mouth, I assemble the venturi vane in the "deep" position, so it is always on max, no matter the depth).

Every G250V I built would violently free flow viva on max. The only thing that's changed between those 30 odd I built and the two I just built for myself is my usage of .218 springs instead of .216 springs. Do you know what spring is in yours?

 

[Geo7]

Do you know what spring is in yours?

Can you tell without knowing the source?

 

[buddhasummer]

Only side by side but even then....

 

[Geo7]

Perhaps the ones you ordered for me will make a difference... That's going to be interesting!

 

[buddhasummer]

Perhaps the ones you ordered for me will make a difference... That's going to be interesting!

Possibly, and only possible if I ordered .216 and yours are a .218.

 

[buddhasummer]

Just checked you ordered .218. Assuming spring is the factor, you'll likely have same results as me with my .218 springs. I'll swap out to .216 springs in the next day or so and report back.