[PSUBS-MAILIST] second stage adjusting

[Rick Patton via Personal_Submersibles]

Hey Alan,
I run all thrusters and the arm from the second stage port on the
inhale exhale port. I don't have an over-pressure valve in the system. Is
that a backup for if the second stage does not vent properly?
Rick.

On Fri, Jan 23, 2026 at 8:07 AM Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick,
> I resin printed a second stage regulator body
> with an adjustment bolt & spring to give up to 10psi overpressure. It has
> a diagphram rated for 80psi that was built for me in China & a standard 2nd
> stage mechanism for regulating air.
> It has an outlet fitting to an 8 port manifold.
> On the manifold I have an over- pressure valve for pressure relief in the
> system.
> I am building an electric manipulator & using the compensator for that as
> well as the thrusters.
> Hanks method of using an additional 1st stage should work. I believe Karl
> Stanley is or was using this method. He said he let the over- pressure
> bubble out through the thruster o-rings.
> Not sure what type of 1st stage Hank is using.
> Possibly the more sensitive diaphragm type.
> You could run a line from the first stage to a manifold and put a beer
> brewing type over- pressure valve in the manifold. Not sure how long the
> spring in the manifold will last though. I think they are 304 stainless.
> Cheers.
>
>
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