divetoyourmax

Is there any way to increase the flow on the adv?

heyydude

Yes.

Increase the IP of your Diluent 1st stage to 200 psi using a shim and/or a stronger spring. (Don't worry folks, I am a professional...) :D

The Mark 15 has a similar valve to the Mark 16, which operates at an IP of around 275 psi. Both have stainless steel tubing rated way above 300 psi leading up to the ADV.


Kevin Juergensen
Juergensen Marine, Inc.

divetoyourmax

Thanks Kevin thats what i thought .

DWill

Did you check this with any other "experts"....

Haaaaaaaa Haa ha....

Dave Sutton

As we discussed, you either raise the IP a lot, or you simply live with the need to ride the manual add valve to the bottom.

On your specific rig, which has been custom modified with an externally mounted manifold tied into the internal diluent line of the rig with a T, the thing to consider is that a higher IP is not going to be workable with the balance of the system. 140 PSI is about all you want, so the BOV works normally and if/when you tap your suit from that manifold you don't blow your drysuit hose and/or inflator valve. Remember also that if you tap offboard gas *into* the rig thru that manifold you'll want its IP to be compatible with the entire system. I see guys raising the IP on the rig regulators to 250 PSI and then plugging in offboard at 150, which offers no improvement at all.

For unmodifed rigs Kevin absolutely has the right advice. For your particular rig, you have other considerations. It's all a matter of pros and cons... you get a lot of value from that manifold, but you will likely need to live with the ADV being a slow one.

Cannot remember: Did we leave the Poseidon first stages in that rig, or swap them out to the Sherwoods? If it still has the Poseidons, IP adjustment is a hex key away so you can play with it. If not, we can shim them with ease to play a little if you like.


Dave

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teksimple

I raised my IP on the diluent side to about 160 PSI using a shim, rather than stick in the stock 200+psi spring . This allows me to get a reasonable ADV flow, but still cause no problems with offboard diluent and my plumbed 2nd stage (balanced Apex Egress to better handle the higher pressure). I have big lungs and often go down fast, and a little resistance never really bothered me. But yes I may press the add valve a bit in the first 50 feet or so. No sweat after that.