Watson Mcdaniel 3040 Series 3040-16-N-3-V Relief and Back Pressure Valve, 1-1/2 in Nominal, NPT Connection, 200 deg F

The 3040 Series back pressure valves relieve upstream pressure in a variety of processes. Automatically maintains desired maximum pressure in a vessel or system by relieving excess pressure into lower pressure return line or to atmosphere. Ideally suited for use as pump bypass control valve by maintaining constant pump discharge pressures. Used as a continuously operating valve or for intermittent protection against over-pressure conditions.