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Mistral DH Reg (~1959) and modern tanks

Discussion in 'Vintage Equipment Diving' started by CT-Rich, Apr 21, 2020.

  1. James79

    James79 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 50 - 99
    Location: Lower Alabama
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    Ninja'd, lol
    Also, if staying with the stock DA nozzle (first stage), search VDH forums on resurfacing the seat.... I just did one and it worked like a champ. Lock-up is crappy at first, but leave it pressurized for a while (some say overnight) and it seats in and starts locking up clean.
    Respectfully
    James
     
  2. captain

    captain Captain

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    Remains of the duckbill may be under the hose.
     
    JamesBon92007 likes this.
  3. JamesBon92007

    JamesBon92007 Great White

    # of Dives: 2,500 - 4,999
    Location: Southern California...too far from the ocean
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    Since it didn't seem to be breathing very easily I figured perhaps the LP seat was screwed down too tight.

    Did there used to be duckbills in the mouthpiece that were replaced with wagonwheels? Or was it always wagonwheels? This is my first doublehose but for some reason I thought they had more than one duckbill valve.
     
    John C. Ratliff likes this.
  4. GJC

    GJC Solo Diver

    # of Dives: 200 - 499
    Location: Southern California, USA
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    There was always a duckbill in the can. Early hoses did not have wagon wheels and were a pain to clear when flooded. Next came the Hope Page mouthpiece with wagon wheels and eventually all double hoses had the valves in the mouthpiece that made clearing the hoses easier. You still need the duckbill though (or a duckbill eliminator valve) otherwise the exhaust hose floods and makes exhalation more work.
     
    JamesBon92007 likes this.
  5. John C. Ratliff

    John C. Ratliff Instructor, Scuba

    # of Dives: I'm a Fish!
    Location: Beaverton, Oregon
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    No, the tightening of the seat holder would increase the Spring tension, but that's not the screw on the top, that's the entire unit. I'll have to check my references to see about the seat holder. Do you have the U.S. Navy Diving Manual from 1970, which goes over the service on the DA Aquamaster?

    Concerning the duckbills, they have always been on the box. The original mouthpiece for the DA Aqualung (the Broxton regulator the preceded the DA Aquamaster) did not originally have any check valves in the mouthpiece. The DA Aquamaster always had mushroom valves in the "Klear-EZ" straight mouthpiece, and later the curved mouthpiece. But, when I went through the U.S. Naval School for Underwater Swimmers, they had removed these valves. When we got to the maintenance of these regulators, some of us surreptitiously inserted the valves into the wagon wheels, which made pool harassment a bit easier.

    SeaRat

    PS, I've posted some photos too, and a repair manual for the Mistral. I don't have the Aquamaster up yet.

    PS1, I've found the Aquamaster manual, but I need you to PM me your e-mail. It is in Google Drive, and that way I can allow you access to it to download it.
     

    Attached Files:

  6. JamesBon92007

    JamesBon92007 Great White

    # of Dives: 2,500 - 4,999
    Location: Southern California...too far from the ocean
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    Let's see, "counter-clockwise is tighter (stops it from leaking)", right?

    So, there were two duckbills, just not on the mouthpiece? That seems to be what's way in the back of my mind (a scary place) somewhere.

    captain emailed me a manual but I'm not sure what year it is--I haven't looked at it yet. I've been working on stuff all winter and finally got a chance to see how things worked today. I serviced my old Calypso single-hose and added a shim to the first stage and wow, I can't believe how well it breathes now. I bought it somewhere around 1973 and dove the hell out of it.

    It's about time I got a double-hose reg. When I took my original NAUI course some were still teaching with double-hose, and others had just started using single-hose regs. My instructor had the single-hose regs. He even had a Sea-Vue gauge on his setup. The rest of us had to rely upon paying attention and being in good enough shape to snorkel back to shore :wink:

    Thanks everyone for all the great info!
     
    John C. Ratliff likes this.
  7. James79

    James79 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 50 - 99
    Location: Lower Alabama
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    Mouthpiece has 2 non-return valves (mushroom style), then the exhaust can has the duckbill to keep water from flooding the exhaust hose. Only one actual duckbill involved. If you'd like, I can take pictures and post.
    Respectfully
    James
     
  8. JamesBon92007

    JamesBon92007 Great White

    # of Dives: 2,500 - 4,999
    Location: Southern California...too far from the ocean
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    Thanks, I think I get it now :)
     
  9. scrane

    scrane Manta Ray

    # of Dives: 500 - 999
    Location: Boise, ID.
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    Go to the VDH forums and do some reading and all will be revealed.
     
  10. CT-Rich

    CT-Rich ScubaBoard Supporter ScubaBoard Supporter

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    My DW Mistral arrived the other day. It came with the mouth piece and the wagon wheels. I ordered the flanges for the wagon wheels and hoses, along with a new filter and retainer. I took the cover off the can and the duck bill and the diaphragm both look to be in good condition. and I did some test breaths off a tank and it felt good. I decided not to do a complete breakdown of the assembly unless people think that is critical. I did skip the Band clamp, $25 seemed pricey for something I might get in a hardware store. I am not sure it came with the correct yoke screw because it was too short for my vintage German twin 50s.
     
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