Watts 3890-08|WW3890-08 - 4 116-1FM 150 XY FM 175PSI

This 4 inch fire pump suction control valve, model 116-1FM, is designed to permit flow when upstream suction pressure is above the adjustable set point of the control pilot, and throttle toward closed when upstream suction pressure falls below the adjustable set point. The valve is installed downstream of the fire pump, and senses pump suction pressure through a field installed pilot sensing line.