O.b o., power in 2 directions with the center position being spring return. So power on both sides of the cylinder, or run 2 separate rams with a spring or gravity return.
Nice tuff well built valve, was set up years ago but never used. Still has the dust caps installed. I upgraded one bolt because the one in there was sloppy, not right, reamed it to fit a 5/16" machine bolt. Oiled the spool and cleaned er up, real nice tuff old-school beastly valve with 3 nice 5/16" mounting holes. Pictures say the most. John in Eagle River by Fred Meyers Alaska no. 242-83two4.
The number on the bottom is B05H
I am not sure the manufacturer, maybe you recognize the insignia. Certainly Pro grade.
Might be Military Spec.
The valve actuation via handle is smooth, and as one would expect, seems to be normal. Been in dry storage for years
Most recently, taking up space on my shop bench, ah ha. Handsome pc.
May be used on a loader tractor bucket.