Dan, I can second the recommendation of using Hydraforce.com cartridge style hydraulic control valves. They have a good web site with quite a wide range of cartridge style valves with complete documentation. In my boat, I use a small hydraulic power-unit and the lowest flow rate (3 gpm or 11.5 lpm) series Hydraforce cartridge valves to handle five separate hydraulic functions, i.e., pitch, yaw and roll control surfaces via hydraulic cylinders, longitudinal movement of a lead weight for trim control via a hydraulic motor, and drop weight release via a hydraulic cylinder. I used individual valve cavities with ports connected via 3/8" SS tubing and Swagelok SS fittings as this a prototype circuit but they can also fabricate a single aluminum block with cavities to accept all the cartridges if you are 100% confident
that you will not have to change the hydraulic circuit. If you are interested, contact me offline and I can send you a PDF of my hydraulic circuit. Hydraforce offers a wide range of port connections (I used SAE 6 ports), coil voltages (I used 24 VDC) and termination connectors (I used dual spades). The hydraulic system on my boat is working as deisgned. The only thing I don't like about my hydraulic power unit is that it is a bit noisy. I am looking for a quieter unit as a replacement.
For those interested in coming up to speed on hydraulics, Parker makes a good paperback training book titled "Industrial Hydraulic Technology, Bulletin 0232-B1, Second Addition (used for $11 at amazon.com).
Cliff
Great works are performed not by strength but by perseverance. Samuel Johnson
----- Original Message ----
From: Brent Hartwig <brenthartwig@hotmail.com>
To: personal_submersibles@psubs.org
Sent: Sunday, December 30, 2007 6:49:08 PM
Subject: RE: [PSUBS-MAILIST] Looking for a Hydraulic valve
Dan,
I posted your question to the hydraulics forum last night and already there are some interesting responses. I've pasted the responses below, but it's easier to read on the forum page format it self, so here is the link. I haven't had a chance to go through there links. So hopefully there is some good practical options in there some where.
http://forums.hydraulicspneumatics.com/eve/forums/a/tpc/f/8621030121/m/2961066362
From: Brent Hartwig <brenthartwig@hotmail.com>
To: personal_submersibles@psubs.org
Sent: Sunday, December 30, 2007 6:49:08 PM
Subject: RE: [PSUBS-MAILIST] Looking for a Hydraulic valve
Dan,
I posted your question to the hydraulics forum last night and already there are some interesting responses. I've pasted the responses below, but it's easier to read on the forum page format it self, so here is the link. I haven't had a chance to go through there links. So hopefully there is some good practical options in there some where.
http://forums.hydraulicspneumatics.com/eve/forums/a/tpc/f/8621030121/m/2961066362
|
New User |
Greetings Hydraulic Junkies, This is my first post here on this forum, so be gentle. 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. | ||
|
|
Boyle |
Hi Brent Hartwig and Dan H. The right solution is "Dive By Wire". Have a look at the attached file. "All in One" , Speed ,position feedback and more ..... Regards-Nahum info@hydrocad.com | |||
|
| |||
|
Bourdon |
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 to see the finished product first hand. Bud Trinkel Fluid Power Consultant | |||
|
| |||
|
Boyle |
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 requirements for the M.Sc. degree" of one of my students , I have nothing. I wonder if someone will accept the challenge. | |||
|
Regards,
Brent Hartwig
Brent Hartwig
From: jumachine@comcast.net
To: Personal_Submersibles@psubs.org
Subject: [PSUBS-MAILIST] Looking for a Hydraulic valve
Date: Fri, 21 Dec 2007 20:03:33 -0500
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 1000PSIThanks, Dan H.