Never herd of a counter balance valve.
Maybe we are talking about the same thing each in our local lingo?
I have worked with flow check and line lock valves.
The first would be used on a single acting cylinder and in the case of a hose break the valve would stop the 'leak' when the flow of fluid was to great.
The second was hard piped between the two ports of double acting cylinders and required the pressure from the pump to open up the valve and let the fluid out of the cylinder.
Bob
