[PSUBS-MAILIST] Parker Pressure Regulator

[Alec Smyth via Personal_Submersibles]

Hi Alan,

Great stuff there! I noticed that upon surfacing the compensation pressure
was high and eventually dropped, so my assumption is this industrial reg
just takes a while to gas off the excess. Certainly I see no sign of a
large cross-section valve like all 2nd stages have. I too am shooting for
about 5psi, but if possible no more. The reason is that my thrusters are
jettisonable and are connected to the compensation lines through a little
plastic tube that is designed to pull off if I drop a thruster. I have
experimented and found that if I increase the compensation pressure above
about 15psi, the hoses blow off.

Best,
Alec

On Tue, Oct 15, 2019 at 2:58 PM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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
> [image: image1.PNG]
>
> [image: image2.PNG]
> 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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