[PSUBS-MAILIST] Closed view

[Alan via Personal_Submersibles]

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 length
right to close the valve. Also pneumatics would be a lot quicker. In choosing
a linear actuator you will need to look at the stroke length, force & speed. So
can 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 Jon
> The 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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