Hi,
Is your employer serious about this project?
You need to know the specs of the valve.
Is it a proportioning valve?
PWM or analog, current required.
If proportioning it sounds like it has inbulit electronics or a control module.
Your employer needs to understand its his money and he needs to "pull his digit out" .
0 to 12V can mean an analog signal or , as we have found here, a very bad misread of the specs and it needs 0 to 12V PWM.
Does he know the difference, stress to him if you get the wrong valve information, there is a major part of his investment down the drain.
He/she should have provided you with a valve to work with.
I'd go out into the workshop and ask one of the assemblers for the instruction/assembly manual/sheet that comes with the valve.
OR ask at stores, they must have them coming out their ears when they unpack and be happy to give you what you need or a look at the valve to copy/photograph the valves name plate.
Question: How is the valve controlled when using hardwire connections, what is on the dash board, as knob or button?
Sorry for the soapbox, but all I see is an employer who wants you to do a job, because he/she probably can't, but won't supply you with the info you need to do this efficiently and quickly.
Not the way to run a project or a business.
Tom... 
PS. If you have internal email, email him your request, that way you have your a*&s covered.