Steam and Hot Water Solenoid Valve Steam and Hot Water Solenoid Valve 2-Way/2-Position Normally Closed Media - Valves Hot Water Steam Pipe Size - Valves 3/8 In. Min Operating Pressure Differential 0 psi Max Operating Pressure Differential Hot Water 100 psi Max Operating Pressure Differential Steam 50 psi Environmental Rating - Valves Indoor Outdoor Voltage 24VDC Coefficient of Volume 4.40 Body Material - Valves Brass Coil Insulation Class H Orifice Dia 1/2 In.