Scubapro 2nd Stage Balanced Poppet

[Zung]

While we're on the subject, let me hijack myself a bit.

The first pic shows the original tan diaphragm and a new/NOS blue diaphragm: is there any difference between them?

The second pic shows the same original diaphragm and a black G250 diaphragm. They seem to be identical. Are they interchangeable? Anybody tried?

 

[LeadTurn_SD]

While we're on the subject, let me hijack myself a bit.

The first pic shows the original tan diaphragm and a new/NOS blue diaphragm: is there any difference between them?

The second pic shows the same original diaphragm and a black G250 diaphragm. They seem to be identical. Are they interchangeable? Anybody tried?

Zung,

I'm using the Black diaphragm in my -109 (it came with an older Black one, and I replaced it with a "newer" lightly-used Black one).

So yes, it should work.

Best wishes.

 

[Zung]

Thanks LTSD.
It breaks my heart: I paid exactly twice for the blue one!:depressed:

 

[redacted]

Thanks LTSD.
It breaks my heart: I paid exactly twice for the blue one!:depressed:

Heck. I paid $75 once for a Mk10 piston. That was quite some time ago and I'm still walking a little funny over that. But, in the long run and even with a few missteps, DIY is both satisfying and saving money.

 

[Zung]

OK, 12 bucks in my case. Thanks for cheering me up!

 

[halocline]

I just bought 2 air1s for over $50 each just for the diaphragms for my pilot. Both were torn....

Don't feel bad.

 

[Couv]

Wow Halo. You should have told me. I could have saved you money by just selling you just a torn diaphragm....no need for the rest of the regulator.

 

[Zung]

After sitting for a week or so, the orifice has found its sweet home in the seat. Upon pressurizing, it hisses a bit, so I give it the tiniest tweak to stop the free flow, et voilà, cracking pressure is 20mm/.8" of water, in line with the rest of the corral.

So here's a pic in fond memory of Doggy who's no longer a dog.

 

[halocline]

cracking pressure is 20mm/.8" of water, in line with the rest of the corral.

If you have a 109 tuned to .8" water, chances are it might flow in the water with your face down due to case fault geometry. No big deal, just turn the knob a bit. If it's stable at .8", terrific.

 

[Zung]

Thanks halo, I just rechecked our main G250's, and here's what gives:

• Dad: 24mm/.94" (10 years since last service)
• Mom: 18mm/.71"
• #1 son: 18mm/.71"
• #2 son: 24mm/.94"

I get these numbers just by tuning 1 hour pass the sealing position. We did maybe 20 dives under these conditions, and I never noticed anything, but then I wasn't paying attention.

Next dive trip will be the Maldives at Christmas, Insh' Allah. I'll pay extra attention to this and report back if I find anything.

Btw, I'm still wondering if I should service my own rig: it's been 10 years, someone I don't know did the job, but it works wonderful. Not a lot of dives in it though, maybe 50, I was busy watching the kids grow.

Edit

Now that I talk about it, this is an interesting comparison between the Standard 109 and the Balanced and/or the G250:

• 109 with the Duro poppet and stiff spring: 10 years of storage and it's a dog, requiring a seat replacement.
• 109 BA or G250 with the balanced poppet and the soft spring: 10 years and still good.