On/off and diverting line voltage valves consist of an actuator motor and valve assembly for controlling the flow of hot or chilled water and some models for steam.

• Manual opener (on all models, except straight-through, normally open valves) for valve operation on power failure; valve returns to automatic position when power is restored
• All models may be installed without disassembling the valve
• Complete powerhead may be removed or replaced without breaking line connections or draining the system