[PSUBS-MAILIST] cue ball arm

[Hugh Fulton via Personal_Submersibles]

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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