Siemens 59902012 3/4" Valve

The Siemens 59902012 3/4" Normally Closed Valve 6.3Cv is a motorized control valve used in HVAC hydraulic systems, to regulate the flow of water or glycol through heating and cooling circuits. It is installed in air handling units, fan coil systems, and chilled or hot water loops where fluid distribution must be controlled based on system demand. The normally closed design keeps the valves shut when no power is applied, opening only when an actuator signal is received. It is used in commercial and HVAC installations to manage coil temperature control and maintain balanced thermal exchange within water-based HVAC systems.