Siemens 371-03111 VALVE ASSY 2W NO, 1/2" 4CV EQ PCT SS TRIM FXF, PROP ELECTR ACT NSRSiemens 371 03111 Valve assy 2W NO, 1 2" 4Cv Eq Pct SS Trim FxF, Prop Electr Act NSR Flowrite 599 Series Valve Assembly features a proportional control (0 to 10 Vdc or 4 to 20 mA), non spring return, 24 Vac electronic actuator. The 2 way, normally open, 1 2 inch, 4 Cv valve assembly is ANSI Class 250 and has an equal percentage characteristic, stainless steel trim, and female x female end connections. Additional Information Valve TypeTwo way Valve