Johnson Controls VG1245AGH943GGA Valve Assembly

The Johnson Controls VG1245AGH943GGA is a precision-engineered 2-way normally closed actuated ball valve designed for demanding commercial HVAC applications. This 1/2 inch NPT assembly features a forged brass body and stainless steel trim, ensuring durability in chilled or hot water systems. With a 4.7 Cv rating and equal percentage flow characteristics, it provides stable control and prevents hunting in the loop. The integrated spring return actuator supports 24Vac/Vdc power and accepts 0-10Vdc, 2-10Vdc, or 4-20mA (via the included 500-ohm resistor) control signals. A built-in thermal barrier protects the actuator from high fluid temperatures, extending the service life of the internal electronics. This modulating control valve is a standard-tier solution for engineers requiring reliable fail-safe operation and precise fluid regulation in hydronic systems. Proper ball valve automation ensures high shut-off pressure ratings and minimizes leakage across the seat.

• Stainless Steel Ball and Stem: Enhanced corrosion resistance and reduced friction compared to plated brass alternatives.
• Fail-Safe Spring Return: Ensures the control valve assembly returns to the normally closed position during power loss.
• Thermal Barrier: Standard inclusion that allows for higher fluid temperature applications without damaging the motor.
• Universal Control: Flexible input options simplify field commissioning and integration with various building automation systems.
• Abrasive Stream Protection: The equal percentage flow disk handles varying pressure drops while maintaining a linear heat output.

What control signals are compatible with this Johnson Controls valve?
This model supports proportional control using 0-10Vdc or 2-10Vdc signals. It can also manage a 4-20mA signal when using the supplied 500-ohm resistor.

Can this valve be field-converted to normally open?
The VG1245AGH943GGA is factory-configured as a normally closed valve. Reversing the action typically requires changing the actuator mounting or control logic rather than internal mechanical modification.

What is the purpose of the thermal barrier on this assembly?
The thermal barrier acts as a heat sink, preventing the transfer of pipe temperature to the actuator housing, which is essential for maintaining electronic component integrity in high-temp hydronic loops.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.