Johnson Controls VG1245ADH943GGA Valve Assembly

The Johnson Controls VG1245ADH943GGA Valve Assembly is a high-performance 1/2 inch 2-way normally closed solution designed for precise hydronic control in HVAC systems. This actuated ball valve features a 1.2 Cv equal percentage flow characteristic, ensuring stable temperature regulation even under varying load conditions. Built with a forged brass body and 300 series stainless steel trim, this assembly is rated for 580 psig static pressure and is compatible with chilled water, hot water, and 15 psi saturated steam. The integrated thermal barrier protects the actuator from high media temperatures, while the VA9203-GGA-2Z spring return actuator ensures a reliable fail-safe position upon power loss. This proportional control valve supports 0-10Vdc, 2-10Vdc, and 4-20mA input signals, offering maximum flexibility for modern building automation. Equipped with graphite-reinforced PTFE seats and double EPDM O-rings, the unit is tested for over 200,000 cycles, providing long-term reliability in demanding commercial HVAC environments.

Key Benefits:

• Precision Modulation: The equal percentage flow disk delivers linear heat output, preventing hunting and improving energy efficiency.
• Reliable Fail-Safe: The spring return mechanism automatically closes the valve during power interruptions to protect equipment.
• High Durability: Stainless steel trim and graphite-reinforced seats provide superior wear resistance in contaminated water systems.
• Versatile Compatibility: Native support for 24Vac/24Vdc power and multiple analog control signals facilitates easy integration with various controllers.
• Steam Rated: The inclusion of a thermal barrier allows for use in low-pressure steam applications up to 15 psi.

Common Questions:

What is the maximum static pressure rating for this valve?
The VG1245ADH943GGA features a forged brass body rated for a maximum static pressure of 580 psig at fluid temperatures within its specified range.

Can this assembly be used for steam applications?
Yes, because this model utilizes stainless steel trim and includes a thermal barrier, it is rated for saturated steam applications up to 15 psig.

Does the actuator support manual override?
The VA9203 series actuator allows for manual positioning using the provided tool, though power must be disconnected to prevent damage to the internal gearing.

How should the valve be oriented during installation?
For standard hydronic use, mount the valve with the actuator above the pipe centerline. For steam applications, it is recommended to install the valve with the stem horizontal to minimize heat transfer to the actuator.

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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.