WWV2193-03, Watts, 3 Inch Globe Pattern Pressure Relief Valve, Class 150 Flanged, Epoxy Coated

This 3 inch globe pattern class 150 flanged epoxy coated pressure relief, sustaining or backpressure control valve, model 116, is designed to permit flow when upstream pressure is above the adjustable set point of the control pilot, and throttle toward closed when upstream pressure falls below the adjustable set point. When the valve is installed off the main line on the branch of a tee it serves as a pressure relief valve, normally closed and opens when upstream pressure exceeds set point. When the valve is installed in line connecting two distribution zones, it serves as a pressure sustaining control valve maintaining pressure in the upstream zone. When the valve is installed in line on the discharge of a pump is serves as a backpressure control valve. When pump discharge pressure falls below the pilot setting it modulates toward a closed position increasing backpressure against the pump.