[doodlebug]

Ok, if I'm understanding the hydraulic system, you have an "open center" gear pump. Constant flow.
The valve's dead head (closed center) the oilflow in nuetral or hold position, and the pump goes over the relief valve?
I have a set of valve's on my skidsteer grader attachment, no call for flow, the oil is sent back to the tank (diverter solenoid valve). When I activate a function, a solenoid valve changes the flow through the valve, until I let let go of the toggle switch. That way the valves can be converted to open or closed center operation, with out having to build 2 types of spool valves. Just change the valve inlet block.

So???????? has anybody thought about a dump valve to send the oil back to tank at low pressure, and not heated via the relief valve????? Yah I'm long winded!
Hope this make's sense. Later, Neil#2 aka doodlebug