Multi-port self-regulating proportional pressure control valve

Abstract From the Canadian patent

A multi-port self-regulating, proportional control valve preferably uses a load output feedback system to produce working fluid load output pressures that are proportional to pilot control fluid pressures. In some embodiments, the control valve is programmable and capable of different load output pressures selected either prior to or during, operation. The, control valve apparatus according to the present invention is capable of a center-off or neutral condition that requires substantially no pilot control flow when there is no control valve output flow.