Are HOG D1 1st stages upstream or downstream?

[bumcikaz]

Its sidestream!!!
Lol

 

[axxel57]

The other problem that could shut off air supply quite completely would be a broken/ collappsed main spring in the 1st stage, but I never heard of that.

 

[KD8NPB]

Balanced downstream 2nd stage.

Only upstream 2nd stage I know are Poseidon... the Jetstream/Thor/Odin models, as well as the Xstream.

 

[victorzamora]

Richard, I'm fairly sure that the new Oceanic/Hollis SE regs are upstream as well....but I could be wrong.

 

[halocline]

The other problem that could shut off air supply quite completely would be a broken/ collappsed main spring in the 1st stage, but I never heard of that.

Actually I'm not sure that would completely shut off air, although a diaphragm first would certainly be the most likely to do so. With flow-by pistons (like the MK2) there's enough downstream pressure on the seat to have some sort of minimal IP above ambient even without a spring, and someone on this forum once tried to operate a MK5 without a spring and supposedly it did deliver some air.

I'm thinking if you sucked hard enough on a 2nd stage you'd reduce the pressure in the IP chamber to less than ambient which would collapse the diaphragm enough to push the seat off the orifice, at least theoretically. I wouldn't want to try it under water!

 

[ams511]

The other problem that could shut off air supply quite completely would be a broken/ collapsed main spring in the 1st stage, but I never heard of that.

Or if the turret detached from the body of the first stage.

 

[WhiteSands]

Thanks all for the information.

 

[KD8NPB]

Richard, I'm fairly sure that the new Oceanic/Hollis SE regs are upstream as well....but I could be wrong.

It looks like a rebadged Poseidon Xstream to me.