A sequence valve for a hydraulic circuit provides a control signal through a control signal port to a pressure responsive flow source to maintain pressure in an accumulator between a low pressure setting and a high pressure setting. The valve includes accumulator, flow source and drain ports, in addition to the control signal port. A spool controls communication between the control signal port and the drain port. A piston is moved by pressure in the accumulator port against a control spring to close communication between the control signal port and the flow source port, and to move the valve spool to close communication between control signal port and the drain port. A differential between the net cross sectional area of the spool establishes the differential between the high and low pressure settings of the accumulator.