OK i've been searching and asking questions for months and I'm getting close to my hydro setup. It's a chevy p/s pump to an 8" x 2.5" bore single ended ram but the problem is the orbitla valve. danfoss sells them in them northern catalogue but I dont know what displacement to get. I'm not worried about centering or using a double ended ram. has anyone used the stuff from northern? the tech guys cant help because of liabilty. also if it matters does anyone have any idea about the gpm flow of a chevy pump. its from a fullsize 70's truck.

i will tell you what i have but it will not be what you need
2x10 cylinder cubic in 31
danfoss steering unit displacement 6.0

I run a 9.6 cu.in. per revolution steering valve with my setup. This gives me ABOUT a 4 turn lock to lock system with a 2.5"X8" ram. Figure the volume of the ram and divide it by the number of turns lock to lock you desire and that will give you the displacement of the steering valve required to do so. :D

Most P/S pumps should put out about 2-3 gpm in the vicinity of 1K to 1.5K psi

First find the volume of the cylinder, then divide by the number of revolutions you desire from lock to lock. Example: A 2 x 8 cylinder
has 24 ci of volume and I want 4 turns 24/4 = 6. The closet valve that I used was 7.3 displacement, worked out to about 3.5 turn lock to lock, great for the trail a little quick for the road, but it never seen the road. You stated that you had a double ended ram, a balanced system, I think you divide the displacement by 2
to get the correct size (not for sure on this). Call the tech at Baileynet.com 1-800-800-1810 they sell the valves and are alot more intune to the products they sell, most of them have a hydralic tech guy handy that can spit out numbers like a popcorn machine. Hope this helps!

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