[PSUBS-MAILIST] Closed view

Sat Dec 22 15:36:06 EST 2018

 Okay, I am guilty of over thinking.  I just pressure tested one of my new MBT valves to 2000 psi and it is undamaged.  I put a plug in the bottom port trapping a small amount of air.  The piston seal stood up to the pressure as did the cylinder wall.  That makes my valves even simpler - no compensation needed.Gamma will be getting a set of these valves as well. Hank
    On Saturday, December 22, 2018, 11:50:36 AM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Rick,what about using a pneumatic piston. You could have solenoid valves operating it if you want to operate it at the press of a button.If you went with a linear actuator you may have trouble getting the stroke lengthright to close the valve. Also pneumatics would be a lot quicker. In choosinga linear actuator you will need to look at the stroke length, force & speed. Socan get a bit complicated. Alan
On 23/12/2018, at 7:05 AM, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Thanks Alan and JonThe screwdriver idea I assume would drive a piece of all thread like a worm drive to open and close the valve? In principle i think that would have enough torque to do the job but am concerned that the valve would open and close very slowly which I don't think would work for this application. What would be perfect would be a simple hydraulic ram with a 4" to 6" throw but then I would have to have all the stuff that comes along with having a hydraulic system, motor, resivore etc which I would prefer not to have to do to just operate one ram. Hank, aren't you using electric rams for your arm?  can you recommend an electric "preferably 12 volt" that would work?Rick 

On Sat, Dec 22, 2018 at 5:08 AM Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Rick, consider conversion of a cheap rechargeable screwdriver.  I've been experimenting with Black & Decker Li2000 which is low voltage (3.6vdc), low rpm (180), has a lot of torque, and is reversable.  At $15 they are pretty much expendable and easily replaceable.  

      From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, December 21, 2018 11:17 PM
 Subject: Re: [PSUBS-MAILIST] Closed view

You guys got me thinking about these solenoid's but for a different purpose. I fabricated a cable/pulley system for opening and closing my VBT flood valve as it is under the floor boards and not in a convenient location on a K-350. Do you Solenoid guys happen to know about how much pressure a plunger can exert? That might be a great way to rotate the valve 90 degrees easily.Rick   

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