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The Cycle Stop Valve model CSV3R is a patented pump control valve that automatically adjusts pump output to match variable flow requirements. Downstream of the CSV3R, pressure remains constant as long as demand on the system is between 5 gpm and the maximum pump output. As flow rates vary, the change in pressure causes the liner inside the CSV3R to modulate closer to or farther away from the grillwork area and seating surface. This enables the pressure downstream of the CSV3R to remain constant regardless of flow.