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 3/4 In. Min Operating Pressure Differential 5 psi Max Operating Pressure Differential Hot Water 150 psi Max Operating Pressure Differential Steam 125 psi Environmental Rating - Valves Indoor Outdoor Voltage 24VAC Coefficient of Volume 8.80 Body Material - Valves Brass Coil Insulation Class H Orifice Dia 3/4 In.