[PSUBS-MAILIST] Idea..?

Thu Jun 18 14:40:08 EDT 2015

It is nothing but a T shape sealed by a spring. If internal pressure builds
up, it pushes the spring and the valve opens. So it is a normally closed
valve... but I suppose you could say its "open all the time" in the sense
that anytime pressure builds up, it will open.

On Thu, Jun 18, 2015 at 2:35 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Couldn't you, theoretically,  have that valve open to the outside all the
> time?
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Idea..?
> Date: Thu, 18 Jun 2015 12:15:57 -0400
>
> I think most have an OP valve, and I'd strongly encourage any who don't to
> put one in. If you read Kittredge's book, the lack of an OP valve was the
> cause of the only K-boat accident so far. Fortunately nothing happened to
> him, but Kittredge had a slow cabin air leak during his dive and upon
> surfacing blew out the dome when just below the surface. He was blown out
> himself with it. The sub sank, and he proceeded to re-float it without
> losing  beat. I use the OP valve routinely to equalize pressure so I can
> open the hatch easily. Just a little push on the stem does it. One thing
> about OP valves, they have to be capable of handling large flow rates.
> Don't use a little Swagelok check valve or such small thing.
>
> Best,
>
> Alec
>
>
>
> On Thu, Jun 18, 2015 at 10:55 AM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Also Alec,   I noticed your check valve overpressure valve in the photo
> section.  That seems like a great solution to the problem!   I guess I was
> not aware of that, does everybody have one of those?
>
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Idea..?
> Date: Thu, 18 Jun 2015 05:25:30 -0700
>
>
> personally, I always avoid welding a machined part to the hull.  I weld a
> flange or nipple to the hull then bolt or thread the machined part to
> that.  This is my solution to a lack of tooling and expertise.
> Hank --------------------------------------------
> On Thu, 6/18/15, James Frankland via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>  Subject: Re: [PSUBS-MAILIST] Idea..?
>  To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>  Received: Thursday, June 18, 2015, 4:58 AM
>
>  Hi
>  Alec\Brian, Yes, maybe it would
>  push in.  A flat step would probably be better like you
>  say.  But maybe im over thinking it as usual.  Probably
>  not required. Brian, I used the
>  5\8ths bar because that's what was specified on the
>  plans.  However, its also convenient for using a 16mm
>  reamer for the bore.
>   regardsJames
>  On 18 June 2015 at 03:04,
>  Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
>  wrote:
>  Oh cool !   Thanks Alec
>  !    I owe you much over the years
>  ! Brian
>  --- personal_submersibles at psubs.org
>  wrote:
>
>  From: Alec Smyth via
>  Personal_Submersibles <personal_submersibles at psubs.org>
>  To: Personal Submersibles General Discussion
>  <personal_submersibles at psubs.org>
>  Subject: Re: [PSUBS-MAILIST] Idea..?
>  Date: Wed, 17 Jun 2015 16:40:56 -0400
>
>  Hi Brian,
>  I tend to use quite thick
>  through-hulls because its easier for me to machine the
>  O-ring grooves into the shaft than into the insert. In my
>  case its just a matter of the tooling I have on hand. If you
>  have the tooling to put the grooves in the insert, half an
>  inch is fine for many applications.
>  Best,
>
>  Alec
>  On
>  Wed, Jun 17, 2015 at 3:22 PM, Brian Cox via
>  Personal_Submersibles <personal_submersibles at psubs.org>
>  wrote:
>  Alec, James,  I'm
>  using mostly 1/2" stainless rod through-out for most
>  all of my hull penetrations ( for valves and flaps) ,  I
>  noticed in the example it was a 5/8" rod,  Why such a
>  heavy duty thickness?  Was that for a particular
>  function? Brian
>
>  --- personal_submersibles at psubs.org
>  wrote:
>
>  From: Alec Smyth via
>  Personal_Submersibles <personal_submersibles at psubs.org>
>  To: Personal Submersibles General Discussion
>  <personal_submersibles at psubs.org>
>  Subject: Re: [PSUBS-MAILIST] Idea..?
>  Date: Wed, 17 Jun 2015 14:03:17 -0400
>
>  Hi James,
>  I think
>  with the taper, this would tend to push in and jam. The idea
>  is neat, however, and would probably work fine with a step
>  instead of a taper. On the other hand, does an O ring sealed
>  through-hull ever fail catastrophically? I've had the
>  odd drip, but that's all I've bad as I've
>  seen.
>  Best,
>  Alec
>  On
>  Wed, Jun 17, 2015 at 12:26 PM, James Frankland via
>  Personal_Submersibles <personal_submersibles at psubs.org>
>  wrote:
>  Hi All Seeing as its a
>  bit quite I thought I would show this idea.  Its super
>  simple.... I have been thinking how
>  you could stop a leaking through hull.  Thinking of K boat
>  type 5\8th through hulls as in the
>  plans. I believe Scott had a leak
>  when he did his deep test due to a faulty O ring?
>
>  Anyway, here is my idea.  It
>  would take a little bit more machining, but not much.
>  Machine the 5\8ths bar with a taper on the protruding
>  part and a taper on the top to help push the bar through.
>  (I did that on mine anyway).  The handle is made with a cam
>  type end.
>
>  If you get a
>  leak, you can pull the handle up.  The bar would be pulled
>  up, forcing the taper to jam into the penetrator, hopefully
>  stopping most of the leak.  I suppose you could even
>  machine a matching taper into the start of the through hull
>  to match? I suppose the bar could get
>  pushed through and jam on its own.  That's a
>  possibility. Pic
>  attached. Kind
>  RegardsJames
>  
>
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