A method for modulating the downstream pressure output of a pressure reducing hydraulic control valve in response to the flow demand fluctuation, the method comprising: (a) providing an adjustable pressure pilot valve mechanism including: (i) a drive element extending from the control valve, said drive element displaceable in response to a flow capacity through the hydraulic control valve; wherein said drive element is implemented as a valve position indicator extending longitudinally from the hydraulic control valve, said valve position indicator being longitudinally displaceable in response to a flow capacity through the valve; (ii) an adjustable pressure pilot valve deployed along a control tube connecting an upstream pressure port to a downstream pressure port, said adjustable pressure pilot valve associated with said drive element such that adjustable settings of said adjustable pressure pilot valve are responsive to displacement of said drive element; (iii) a cam deployed on, and displaceable with, said valve position indicator; (iv) a pressure regulating lever; (v) a roller extending from said pressure regulating lever so as to interact with a sloped shoulder of said cam such that during said displacement of said cam a position of at least a portion of said pressure regulating lever is varied; and wherein said adjustable settings of said adjustable pressure pilot valve are responsive to said variation of said position of at least a portion of said pressure regulating lever; (vi) a spring associated with said adjustable pressure pilot valve such that said variation of said position of at least a portion of said pressure regulating lever varies a load of said spring and said adjustable settings of said adjustable pressure pilot valve are responsive to said load of said spring; (b) initiating flow through the hydraulic control valve; and (c) automatically displacing said drive element in response to a flow capacity through the hydraulic control valve, thereby adjusting said adjustable settings of said adjustable pressure pilot valve. (a) providing an adjustable pressure pilot valve mechanism including: (i) a drive element extending from the control valve, said drive element displaceable in response to a flow capacity through the hydraulic control valve; wherein said drive element is implemented as a valve position indicator extending longitudinally from the hydraulic control valve, said valve position indicator being longitudinally displaceable in response to a flow capacity through the valve; (ii) an adjustable pressure pilot valve deployed along a control tube connecting an upstream pressure port to a downstream pressure port, said adjustable pressure pilot valve associated with said drive element such that adjustable settings of said adjustable pressure pilot valve are responsive to displacement of said drive element; (iii) a cam deployed on, and displaceable with, said valve position indicator; (iv) a pressure regulating lever; (v) a roller extending from said pressure regulating lever so as to interact with a sloped shoulder of said cam such that during said displacement of said cam a position of at least a portion of said pressure regulating lever is varied; and wherein said adjustable settings of said adjustable pressure pilot valve are responsive to said variation of said position of at least a portion of said pressure regulating lever; (vi) a spring associated with said adjustable pressure pilot valve such that said variation of said position of at least a portion of said pressure regulating lever varies a load of said spring and said adjustable settings of said adjustable pressure pilot valve are responsive to said load of said spring; (i) a drive element extending from the control valve, said drive element displaceable in response to a flow capacity through the hydraulic control valve; wherein said drive element is implemented as a valve position indicator extending longitudinally from the hydraulic control valve, said valve position indicator being longitudinally displaceable in response to a flow capacity through the valve; (ii) an adjustable pressure pilot valve deployed along a control tube connecting an upstream pressure port to a downstream pressure port, said adjustable pressure pilot valve associated with said drive element such that adjustable settings of said adjustable pressure pilot valve are responsive to displacement of said drive element; (iii) a cam deployed on, and displaceable with, said valve position indicator; (iv) a pressure regulating lever; (v) a roller extending from said pressure regulating lever so as to interact with a sloped shoulder of said cam such that during said displacement of said cam a position of at least a portion of said pressure regulating lever is varied; and (b) initiating flow through the hydraulic control valve; and (c) automatically displacing said drive element in response to a flow capacity through the hydraulic control valve, thereby adjusting said adjustable settings of said adjustable pressure pilot valve.