Zone Valve; Type 2-Way; Applicable Standard UL; Nominal Size 1/2"; End Connection Soldered x Soldered; Actuation Type Spring Return; Valve Position Normally Closed; Body Material Brass; Valve Timing 15 Second Normally Open; Input Supply Rating 7.7 VA at 24 Volt AC 50/60 Hertz 0.32 Amp; Temperature Rating 50 to 200 Deg F Fluid; Pressure Rating 20 PSI Close Off, 125 PSI Static; Inclusions/Features Easy Installation, Manual Opener for Valve Operation, End Switch Enclosure; Application Hydronic Control, Steam Control, Fan Coil Unit; Overall Dimension 3-1/2" Width x 2-3/8" Depth x 4" Height; Maximum Differential Pressure 20 PSI Close off; Electrical Connection Screw Terminal Block; Flow Coefficient 3.5; Seat Material Brass; Stem Material Stainless Steel; Ball Plug Material Buna-N Rubber Ball; Disc Material Buna-N Rubber Ball; Packing Material EPDM Rubber O-Ring; End Switch Rating 50 VA Pilot Duty at 24V; Auxiliary End Switch SPST