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ON-OFF and two-way low voltage valves consist of an actuator and valve assembly for controlling the flow of hot 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. Compact construction for easy installation. Complete powerhead may be removed or replaced without breaking plumbing line connections or draining the system. Actuator motor may be replaced without removing the valve body or draining the system. Chilled water models available for cooling and heating applications.