Liquid Relief ValvesModel 19 • Pressure range: 1 to 300 psi Temp. range: -60° to 406°FA handwheel allows for easier adjustments. Inlet and outlet connections allow easier inspection and servicing without disconnecting valve from line. Bronze body with stainless steel spring and bronze disc. MNPT x FNPT connections. For pressure relief, liquid relief, continuous bypass relief, and overprotection for pumps, tanks, pipelines, and hydraulic systems.