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[PSUBS-MAILIST] Looking for a Hydraulic valve



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.