Pressure-Relief Valves for Cryogenic LiquidsPressure Relief Valves for Cryogenic Liquids Valve Function Pressure Relief For Use With Liquid Carbon Dioxide, Liquid Nitrogen, Liquid Oxygen Activation Pressure Driven Inlet Pipe Size 1 4 Connection Type Pipe Pipe Connection Type Threaded Connection NPT Male Location Bottom Maximum Pressure 600 psi Relief Port Thread Size 3 4" 20 Connection Type Pipe Pipe Connection Type Threaded Connection UNEF Female Location Top Set Pressure Accuracy 5% Set