[PSUBS-MAILIST] Bellows add

[hank pronk via Personal_Submersibles]

Alan,  I was thinking the same idea with the scuba regulator.  I rely on the altimeter and am a good habit of checking it.  Also I am like the canary in the mine.  I get real sore ears when the pressure changes in the sub.Hank
    On Sunday, May 24, 2020, 1:24:32 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hank,there is a flaw with the Bellows Add system that I can see, in that if youhave an air leak that increases the cabin pressure then the Bellows Addsystem won't add O2. Ultimately you are relying on your O2 sensor & even then O2 sensorshave a large failure rate & a life expectancy.Rebreathers use 3-5 sensors for redundancy & compare signals.For a large sub you have a lot more time for any failure to have an effectthan you would in a sub like your 1 person or Cliff's. Maybe if you insist on a Bellows Add system, have an extra O2 sensor.The second stage regulator works the opposite way than what you wantwith the water pressure pushing on a thin diaphragm that has a lever theother side that opens the valve. Maybe if you glued the lever to the insideof the diaphragm you could open a valve with it. You would only use the regulator valve though, as the rest would be useless.Better still, make a small sealed enclosure with a diaphragm on one face& attach the second stage lever mechanism to the outside against the diaphragm.That way you could make a screw in / out fine tuning adjuster as per DW.Alan

On 25/05/2020, at 1:50 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Hi All, I am looking for ideas on how to make a automatic O2 feed similar to the DW bellows add.  I want a non electronic system.  I was thinking about a scuba second stage regulator conversion, that senses negative pressure to release O2.  Sean???Hank

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