[PSUBS-MAILIST] Parker Pressure Regulator

[Alan via Personal_Submersibles]

Alec, thanks.
I have several scuba regulators on my ambient sub.
I used octopus regulators as they are slightly less sensitive so that they don't 
free flow. As per pictures below, I took off the mouth piece & attached some
some clear plastic tubing that I heated & forced on. On the exhausts I fitted
& glued PVC bends to keep air on the outer side of the exhaust valve & stop
water coming in the system. Not all regulators are the same so you need to
Source the most adaptable one. I believe it was Greg that liked the idea of the 
exhaust extension as he said he had been using regulators & getting a bit of water 
in his thrusters.
I had thought of machining a housing & fitting scuba second stage parts in it;
adding a spring to give 5 psi overpressure & using a BCD exhaust valve with
an appropriate sized spring in it.
I have an Ex military document on compensating motors, & 5 psi is the standard,
however there are large variations on that. Commercial compensator pressure
varies from around ( roughly) 3 to 9 psi over pressure depending on the oil level 
/ Spring Extension. 
Is the off gassing volume going to be a problem? In the last 33ft to the surface 
the volume will double but even if it is still releasing air after you hit the surface
it shouldn't be an excessive pressure should it?
Karl Stanley was using a first stage regulator with spring removed ( gives ambient
pressure) for air compensation & said he just let the air bubble out the thruster seals.
Alan



> On 16/10/2019, at 4:31 AM, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> I believe I have the same one as Cliff. I'm going to look into swapping it out for a SCUBA second stage, which I think will be both more sensitive and definitely able to handle a larger off-gasing volume. What I'm wondering about is how to connect something that's intended for a human mouth to Swagelok tubing instead. Any suggestions are welcome!
> 
> Thanks,
> Alec
> 
>> On Tue, Oct 15, 2019 at 1:14 AM Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Cliff & Alec,
>> I have just been playing around with my Parker miniature regulator.
>> As Alec noted there is quite a bit of pressure difference between the set
>> pressure & the relieving pressure. I have been turning the pressure up
>> to 20psi & then turning it down, & it takes a lot of turns to bring the pressure
>> down again. Ie. 1 full turn to go to 20psi but 2 full turns to drop pressure
>> back to zero.
>> I am using a cheaper Aluminium version for experimentation & bought the 
>> 0-125 psi range, which In hindsight was a mistake as I am not getting the 
>> sensitivity I need.
>> What range did you guys buy. I see you can get 0-25 psi.
>> I am running my thruster full of silicone oil & just a few inches of air in the feeder
>> tube from the regulator. 
>> Alan
>> 
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