[PSUBS-MAILIST] regulator

Fri Mar 30 16:38:04 EDT 2018

Hank,
the tube extension was my idea & I think Cliff agreed on it being helpful.
Not sure if he implemented it. Cliff may wade in on this but adding my bit as
he is sometimes busy travelling.
The thought was that the air in the relief vent may get compressed a long way
up in to the handle area & let water go through the relief valve.
Another concern is the spring in the handle area that will see water.
I went through the process of trying to find a replacement stainless spring
for a cheap plastic relieving regulator I bought, but gave up. Might re-look
at this.
Below is a link to a diagram & explanation of the R364 in case you haven't 
seen it.
Alan
 https://www.parker.com/literature/Literature%20Files/watts/cat/0300-2_Stainless_FRLs.pdf#page12

Sent from my iPad

> On 31/03/2018, at 8:40 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> Thank you for the input.  I went with the brass because I was in a hurry and Gamma will never see salt water.  The small tank can be fed continuously from the main tank.  I will leave the air supply on until I reach bottom then shut the air supply off.  I did know to invert the regulator but did not know about a tube that has to be added.  Cliff did not mention that?  I am sure that air in the motor is better and will take less battery power also.  So you think I should air compensate the motor and risk the arm actuators?  You have a good point that the actuators would be aired up, I did not think of that.
> Hank
> 
> 
> On Friday, March 30, 2018, 1:31:48 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> if it were a non relieving it would have a K designation after the 02B.
> https://store.livhaven.com/downloads/dl/file/id/4873/datasheet.pdf
> You will need to take the plastic handle off to put a plastic tube over
> the relief valve outlet to help stop any water going past the relief valve, 
> & as you probably know, mount it upside down. When you do this you
> may be able to see the air bubbling out if you place it upside down in
> water, pressurise your arm, & then back the pressure off the regulator
> as you have done before.
> You have gone with the brass & not stainless. Was it a lot cheaper?
> Does the 3L tank get fed continuously from the main tank, so that if there
> was a leak it would drain the whole of your main tank before any pressure
> in the motor or arm dropped below ambient?
> If you noticed an unexpected drop in main tank pressure & suspected it
> was caused by the thruster, you could shut off air to the regulator & go up
> knowing that as you ascend you will always have at least ambient pressure.
> I made enquiries with Fugu sub about compensating & they said they
> preferred air for brushed motors & liked to see a bit of air bubbling out as
> a reassurance they had some positive internal pressure.
> Cheers Alan 
> 
> 
> Sent from my iPad
> 
>> On 31/03/2018, at 6:43 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Cliff,
>> I just installed my R364-02B regulator on my arm and the instructions talk about a non relieving model.  I assume this one is relieving because when I reduce the pressure to the arm the excess pressure bleeds off when turning the adjustment knob. Is that correct?   
>> Also to anyone with an opinion, the air system regulator for compensation to the arm is literally 1 foot from my side positioning thruster.  This makes me think I should air compensate that thruster instead of oil.   The system works with a small 3L air holding tank that is maintained at 300 psi from the main HP tank.  I am not sure if I should risk feeding the thruster from the small tank, in case the thruster seal  leaks it could cause the arm to flood.  
>> Hank
>> 
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