Johnson Controls VG1245CNH923GGA Valve Assembly

The Johnson Controls VG1245CNH923GGA is a high-performance 1-inch NPT ball valve assembly engineered for precise modulation in commercial hydronic systems. This two-way normally open configuration is built with a forged brass body and stainless steel trim, providing the durability required for both chilled and hot water applications. The valve features an 11.7 Cv rating with an equal percentage flow characteristic, which is critical for maintaining stable control loop performance and preventing hunting at low-load conditions. The integrated spring return actuator ensures a reliable fail-safe position upon loss of 24Vac or 24Vdc power, protecting equipment from potential overflows or temperature spikes. For signal versatility, the unit accepts 0-10Vdc and 2-10Vdc proportional inputs, and includes a 500 ohm resistor to facilitate 4-20mA control strings. Additionally, a factory-installed thermal barrier isolates the actuator from the valve body, significantly reducing heat transfer and extending the life of the electronic drive components in high-temperature environments.

Key Benefits

• Fail-Safe Operation: The industrial-grade spring return actuator automatically drives the valve to a normally open state during power interruptions.
• Enhanced Material Longevity: Stainless steel trim and a forged brass body resist corrosion and scaling better than standard chrome-plated alternatives.
• Flexible Control Options: Supports various BMS architectures with 0-10Vdc, 2-10Vdc, and 4-20mA (via resistor) input compatibility.
• Precise Flow Regulation: The equal percentage flow design ensures linear thermal output from the coil regardless of pressure fluctuations.
• Actuator Protection: An integrated thermal barrier prevents overheating of the actuator electronics in high-temperature piping systems.

Common Questions

What is the fail-safe position for the VG1245CNH923GGA?
This specific model is a normally open assembly; the internal spring will mechanically drive the valve to the open position if the 24V power supply is lost.

How do I configure this unit for 4-20mA operation?
You must install the provided 500 ohm resistor across the input terminals to convert the current signal into a voltage range compatible with the actuator's electronics.

Can this valve be used in steam applications?
This actuated ball valve is primarily designed for water and water-glycol solutions. Consult the specific temperature and pressure ratings for your media to ensure compatibility with the forged brass and stainless steel components.

This item is not eligible for free shipping.

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.