The Johnson Controls VA7820-HGA-2 Electric Valve Actuator is a versatile product useful for controlling water flow in HVAC systems, especially with fail-safe shut down that closes the valve in the event of an event. It is a durable product that can be easily installed directly to the rotary globe valves. Unlike basic on/off actuators, it can accept a range of control signals, including floating voltage, proportional 0-10VDC, and proportional 4-20mA. This provides a measure of control of the water circuit throughout the system in the HVAC system
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