<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Alec,</div><div>just re-assembled my regulator & it now works really well & the relieving</div><div>function is very sensitive. I got a bit of silicone in it while pulling apart so</div><div>this probably loosened things up.</div><div>Alan</div><div><br>On 16/10/2019, at 6:15 PM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="content-type" content="text/html; charset=us-ascii"><div><span></span></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div><span></span></div><div><div></div><div>Thanks Alec, I can see your problem.</div><div>The Parker regulator I am using at the moment is the R374-O2C.</div><div>This looks pretty similar to Cliff's <span style="background-color: rgba(255, 255, 255, 0);">R364-02BSS/M1 but with an Aluminium</span></div><div><span style="background-color: rgba(255, 255, 255, 0);">body. I just pulled it apart. You can see the small relieving hole in the </span></div><div>brass centre of the diaphragm in attached photo.</div><div>I had a look at the relieving spring at the bottom of the regulator, thinking</div><div>I could replace it with a lighter Spring, but it has less power than a ball point pen.</div><div>You could cut a bit off it & see if it improves things but I think if you are air</div><div>compensating you have a lot of air going out through that small hole on</div><div>ascent & that will push the pressure up in the thruster. You could oil </div><div>compensate with the same set up & only have a fraction of the air to expel,</div><div>but I guess you are considering the environment!</div><div>Alan</div><div><image1.JPG><br></div><div><br></div><div><br></div><div><br>On 16/10/2019, at 4:23 PM, Alec Smyth via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Hi Alan,<div><br></div><div>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. </div><div><br></div><div>Best,<br>Alec </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 15, 2019 at 2:58 PM Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div></div><div>Alec, thanks.</div><div>I have several scuba regulators on my ambient sub.</div><div>I used octopus regulators as they are slightly less sensitive so that they don't </div><div>free flow. As per pictures below, I took off the mouth piece & attached some</div><div>some clear plastic tubing that I heated & forced on. On the exhausts I fitted</div><div>& glued PVC bends to keep air on the outer side of the exhaust valve & stop</div><div>water coming in the system. Not all regulators are the same so you need to</div><div>Source the most adaptable one. I believe it was Greg that liked the idea of the </div><div>exhaust extension as he said he had been using regulators & getting a bit of water </div><div>in his thrusters.</div><div>I had thought of machining a housing & fitting scuba second stage parts in it;</div><div>adding a spring to give 5 psi overpressure & using a BCD exhaust valve with</div><div>an appropriate sized spring in it.</div><div>I have an Ex military document on compensating motors, & 5 psi is the standard,</div><div>however there are large variations on that. Commercial compensator pressure</div><div>varies from around ( roughly) 3 to 9 psi over pressure depending on the oil level </div><div>/ Spring Extension. </div><div>Is the off gassing volume going to be a problem? In the last 33ft to the surface </div><div>the volume will double but even if it is still releasing air after you hit the surface</div><div>it shouldn't be an excessive pressure should it?</div><div>Karl Stanley was using a first stage regulator with spring removed ( gives ambient</div><div>pressure) for air compensation & said he just let the air bubble out the thruster seals.</div><div>Alan</div><div><image1.PNG><br></div><div><br></div><div><image2.PNG><br>On 16/10/2019, at 4:31 AM, Alec Smyth via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">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!<div><br></div><div>Thanks,<br>Alec</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 15, 2019 at 1:14 AM Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Cliff & Alec,<br>
I have just been playing around with my Parker miniature regulator.<br>
As Alec noted there is quite a bit of pressure difference between the set<br>
pressure & the relieving pressure. I have been turning the pressure up<br>
to 20psi & then turning it down, & it takes a lot of turns to bring the pressure<br>
down again. Ie. 1 full turn to go to 20psi but 2 full turns to drop pressure<br>
back to zero.<br>
I am using a cheaper Aluminium version for experimentation & bought the <br>
0-125 psi range, which In hindsight was a mistake as I am not getting the <br>
sensitivity I need.<br>
What range did you guys buy. I see you can get 0-25 psi.<br>
I am running my thruster full of silicone oil & just a few inches of air in the feeder<br>
tube from the regulator. <br>
Alan<br>
<br>
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