Posted by Janicholson on December 06, 2020 at 07:52:46 from (24.240.46.228):
In Reply to: getting the right part posted by tedregentin on December 05, 2020 at 18:09:50:
I agree with the others. The closed center demand driven hydraulic systems are built into modern tractors and have complex pumps and complex valving. Neither is likely to be found on a PTO pump. Open center valves have an intake port from the pump, and a return port to the reservoir, that are connected (open to each other) when the control handle is in the middle of its movement. This allows the pump to just push oil right through the center of the valve creating zero pressure. Two other ports (usually on the ends) connect to cylinders or hydraulic motors. When the lever is moved, the passage through the center is blocked off causing the flow to go out to the cylinder on one hose, and back to the reservoir from the cylinder on the other port. Closed style valves do not allow oil to flow through when in the middle position. This would immediately cause your pump to go to max pressure and get things very hot very rapidly. Go with the open center valve. If you want a third valve, buy them all as a stack of valves at one time. The open center type can only be used one valve at a time when operating a loader, so don't use more than one handle at a time. Jim
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