‏Greetings Hydraulic Junkies,

This is my first post here on this forum, so be gentle. ' I'm currently designing a personal hydrobatic submarine that uses allot of hydraulcs, so it's an area I need to increase my skills in. I'm apart of another forum for discussing personal submarine related subjects and a friend of mine had a question that are group couldn't answere. He has built his own very nice personal two person submarine that you can see pictures of at this site.

http://www.vulcaniasubmarine.com/PERSISTENCE.htm

So as you can see he's no slacker. So here is the question from by friend Dan below.

Regards,

Brent Hartwig

From: owner-personal_submersibles@psubs.org on behalf of Dan. H. (jumachine@comcast.net)
Sent: Fri 12/21/07 5:41 PM
Reply-to: personal_submersibles@psubs.org
To: PSUBS (Personal_Submersibles@psubs.org)
Maybe someone out there can help me find a hydraulic valve.

I'm working on a design for a manipulating arm for my sub, Persistence. The specific design I'm doing is for a K-sub, but it could be adapted to most any sub with a brow.

I want to make it as powerful as possible and still keep it compact and easy to operate. For a good power to size ratio and good control, I've decided to operate it with hydraulics. I've located a nice small 12VDC power unit that puts out 1/2 gallon a minute at 600 PSI pressure. I consider that perfect because 600 PSI will deliver a lot of punch but can be piped through plastic tubing, sparing the need for bulky wire and rubber hydraulic hoses. I also found small compact cylinders in a range of length that are rated at 600 PSI.

What I can't find is the directional control valve I need. What I would like to use is, 12volt to 36 volt DC, solenoid actuated, directional control, hydraulic valves that mount on one common manifold. I can fine all I want rated at 30 gallons per minute at 2500PSI, but their big and really over kill for this small application. I was thinking of trying to use pneumatic valves but I'd have to experiment to see how they would work with fluid and also their not rated for high enough pressure.

I would like the valve operated with electrical solenoids rather then mechanical operated because that will allow me to use wires to go through the hull, rather then two fluid lines for each of the six cylinders I'm using.

I'm doing the design in Auto CAD and plan to release it to the web, for anyone to use, once I have it finished.

Can anyone help me locate the small valves?
For you European guys, sorry but I don't speak metric very well but maybe you can convert.

*Six valve manifold block Five will work if that's all I can get
*Six duel direction cylinder spools, with closed center position
*12 - 36 VDC electrical solenoid actuated
*Rated at 1/2 GPM flow minimum but not over 5GPM.
*Rated at, minimum 500PSI but not more then 1000PSI


Thanks, Dan H.

Hi Brent Hartwig and Dan H.
The right solution is "Dive By Wire".
Have a look at he attached file.
"All in One" , Speed ,position feedback
and more .....
Regards-Nahum
info@hydrocad.com

DLFC-SUB.pdf (226 Kb, 96 downloads)

Try this web page for valves that can be inserted into a manifold and rated at 3 GPM with te voltages you asked for PLUS.

http://www.hydraforce.com/Solenoid/Sol-pdf/1-520-1.pdf

BTW Interesting link. I would love tosee the finished product first hand.

Bud,
"BTW Interesting link. I would love to
see the finished product first hand".
Apart of a Prototype Prove of Concept
and "partial fulfillment of requirementsfor
the M.Sc. degree" of one of my students , I have nothing. I wonder if someone will accept
the chalenge.

MUKI-NPPP.pdf (179 Kb, 52 downloads)

Nahum;

I was referring to the Submarine in my post but the Non-Pulsating Piston Pump is interesting as well. The heart shape Cam must be what makes it happen.

I hope you find someone to build the finished product and use the concept in a real world application. Sorry I can't help you there. My Social Security checks don't allow extra expenditures.

Hi Bud,
It was my mistake attaching the wrong file.
The DLFC-Digital Linear Force Control is a
real product produced to day by Ashrad Ltd.
It consists of Electric Motor (AC,DC),
Vatiable Radial Piston Pump controlled by
a Digital Step Motor , Valves and Actuator
with internal LVDT Feedback.
Have a look at the attached file.

Hawe and other Euro manufacturers make manifold mounted valves, similar to our D03, but only two bolt mount and much smaller.
There are cartridge valves for the animation industry (Disney, casinos, etc) tha make very small cartridge valves for the restricxted flows and spaces inside the puppets and exhibitions.

kcj