[PSUBS-MAILIST] cue ball arm

Fri Nov 28 16:03:47 EST 2014

Hank,
OK I never realised that.  Very intesting.  The cue ball (plastic) on a
curved SS seat. Reversed SS Ball on plastic seat. 
No doubt there is a reason behind it all where we need a bit of history.
Vance, are you listening?  They will have tried a ball valve design at some
stage most probably
and found that the lowest friction is from the design they came up with.  We
usually have a torque of about 5 ft lbs but again it is for 6000 psi
service.  I need to have a play with this as it is quite fascinating.  Chs,
Hugh

-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of hank pronk via Personal_Submersibles
Sent: Saturday, 29 November 2014 9:42 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] cue ball arm

Hugh,
Now that is interesting!  Just so you know, the original cue ball sits on a
ss shaped seat that matches the ball perfectly.  The seal is a regular 1/8
in dia o-ring mounted at the equator of the cue ball.
Hank--------------------------------------------
On Fri, 11/28/14, Hugh Fulton via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] cue ball arm
 To: "'Personal Submersibles General Discussion'"
<personal_submersibles at psubs.org>
 Received: Friday, November 28, 2014, 3:27 PM

 Hank, A metal ball is
 fine.  Brass is likely to corrode faster than 316 SS  if it is not looked
after. The harder the  better of course but if it is kept  greased  then you
won't have a problem.  Forget the seal having  to be curved  for the ball. 
We use 45  degree seats at 6000 psi.  There is less torque  required on a 45
degree seat than a fully  shaped one and the sealing is  better.  We  allow
about 3 to 4 thou of crush from finger tight to  fully  torqued bolts.
Because you are only  doing low pressure you can get more  angle  with the
seat contact to give you a greater movement. As I  said before  the secret
is in the grease for  ease.  Do you have an oxygen grease?  White  stuff. 
Will reduce the friction by 60%.  Regards,  Hugh     

 -----Original Message-----
 From: Personal_Submersibles
[mailto:personal_submersibles-bounces at psubs.org]
 On Behalf Of hank pronk via
 Personal_Submersibles
 Sent: Saturday, 29
 November 2014 8:59 a.m.
 To: Personal
 Submersibles General Discussion
 Subject: Re:
 [PSUBS-MAILIST] cue ball arm

 Hi Hugh,
 I
 don't have the original drawings yet, but Vance has them  and is sending
them to me.
 I
 am going to experiment with a brass ball to replace the cue  ball.  With
the modified ball valve I can  use a metal ball now.  Any thoughts on that.
 Hank--------------------------------------------
 On Fri, 11/28/14, Hugh Fulton via
 Personal_Submersibles
 <personal_submersibles at psubs.org>
 wrote:

  Subject: Re:
 [PSUBS-MAILIST] cue ball arm
  To:
 "'Personal Submersibles General
 Discussion'"
 <personal_submersibles at psubs.org>
  Received: Friday, November 28, 2014, 2:46  PM

  Hi Hank,
  Do you or anyone else, have a cross section  of  the cue-ball, glands, and
arm  mechanism  anywhere?
  I would like to have
 a look at the
  seal side as well.  We make
 ball valves  and  have done a lot of work on  different designs of seals. 

 Might be able to come up with one that is  easier to  move.  We use an
oxygen  grease  which is  magic for reducing friction. Goes under the name
of  "slippery pooze" here in the  workshop.
  Regards, Hugh.

  -----Original
 Message-----
  From: Personal_Submersibles
 [mailto:personal_submersibles-bounces at psubs.org]
  On Behalf Of hank pronk via

 Personal_Submersibles
  Sent: Saturday, 29
  November 2014 5:42 a.m.
  To:
 personal_submersibles at psubs.org
  Subject: [PSUBS-MAILIST] cue ball arm

  Hi Alan,

 I
  just added a picture of the cue ball arm,  ball assembly,  installed on
Gamma.  You  can see the range  of motion and how it mounts to the  sub.
  Hank

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