Vintage Double Hose

Finally I got some time to wiork on this DW Stream air with the mistral tag on it.

Got everything done up ok followed the regulator repair CD i got from bryan. When i put it on the magnahelic it cracks at 1.6 inches at 2000 psi in the tank.

On a tank with 1200 psi it cracks at 1.6 inches .

Is tehre a way of fine tuning this reg, or is it a one size fits all for tuning.

Worked a bit more on the Stream Air. Got it down to 1.4 " on the magnehalic. Ploished up the primary and secondary lever contact points, and allowed the secondary klever to sit higher than the edge of the can. Am using a silicone diaphragm it seems to have a fair bit of room for this adjustment. Will try to find that sweet spot that makes these regs so sweet.

I note that the nozzle in the HP block does not point directly into the inhalation horn. I thought of taking a small length of aquarium tubing and stick it on the nozzle and allow a gentle curve in it to place it into the horn itself. Is this advisdeable. The nozzle is the longer Mistral version.

treasureman wrote:I note that the nozzle in the HP block does not point directly into the inhalation horn. I thought of taking a small length of aquarium tubing and stick it on the nozzle and allow a gentle curve in it to place it into the horn itself. Is this advisdeable. The nozzle is the longer Mistral version.

I was just reading in Fred Roberts' book that DW conversions to Mistral standard by using the longer nozzle can cause a "gush of air" upon inhaling, so the nozzle should be offset to create more "turbulence" inside the can, and lessen the "gush" effect.
Others may have a different take on this; I'm just mentioning what I read in "Basic Scuba"..

Now that we are all "gushing" over this... ....

all joking aside. nice to know, had not thought about it. and it makes sense. With that sort of air coming through, it might not be a good thing to have it directed down the hose

I would raise the lever as high as possible without causing a freeflow once the can is clamped together.

Thanks captain. I will try that tonite. Seems with the silicone diaphragms, ther is quite a bit more room for adjustment.

Got the lever set as high as it will go without a freeflow, and backed it off a touch. Secured the "wheel" so as to hold the plate solid, tightened down the nut, put it all back together, and voila (thats french for holy S***t.. it works).

Cracks open at 1.1 on the magnehalic with a tank pressure of 2000 psi.

If it only gets better at lower pressure, then this may end up replacing my Pheonix..........


ok just a little humour. couldnt replace my pheonix if i wanted to. and i dont.

Thanks for all the help everyone. couldnt have done it without you.

I tried putting a piece of tygon on a Mistral nozzle and a few other tricks and it really did not do anything but waste my time.

James