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Power-User

Join Date: Mar 2011
Posts: 106
Good Answers: 2

External Pressure Controlled Valve.

03/08/2011 11:35 PM

I'm in the process of designing a rebreather for diving and I've run into a snag. I need to regulate the pressure in the "breathing bag" in conjunction with the increase/decrease in pressure on the outside of the "bag". The way I understand it a standard release valve is set by compressing a spring to supply the resistance for the valve. Do you get a commercial valve that could be adjusted by an external source? I know dive regulators have this function but I'd really not have to reinvent the wheel if I can get one off the shelf. I'll be looking at keeping the internal pressure of the "bag" at about 0.1 bar higher then the out side pressure.

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Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
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#1

Re: External pressure controlled valve.

03/08/2011 11:56 PM

You might try searching on "differential pressure regulators". The ones I sometimes use in refrigeration wouldn't be sensitive enough, but the idea is that upstream pressure is on one side of the diaphragm, and downstream on the other. This effectively subtracts; hence differential.

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Power-User

Join Date: Mar 2011
Posts: 106
Good Answers: 2
#2
In reply to #1

Re: External pressure controlled valve.

03/09/2011 5:04 PM

Thanks, this looks like just the thing I'm looking for. I had a quick look around and the valves look larger then I'd like but I'll try the local supplies and see what they can get for me. Thanks again

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