Johnson Controls VG1245AFH923BGA Valve Assembly

The Johnson Controls VG1245AFH923BGA is a premium 2-way normally open ball valve assembly engineered for precise control in demanding hydronic HVACR systems. This 1/2" NPT assembly features a high-performance VA9203 series spring return actuator, providing reliable fail-safe operation in the event of power loss. Designed for versatility, the unit supports both 24Vac and 24Vdc power inputs, making it a standard choice for modern building automation interfaces. The forged brass body is complemented by a stainless steel trim and 15% graphite-reinforced PTFE seats, ensuring a rating of 580 psig static pressure and 200 psi close-off. With a 2.9 Cv equal percentage flow characteristic, this valve delivers exceptional rangeability for chilled water, hot water, and low-pressure steam applications (up to 15 psi). The integrated thermal barrier extends the life of the actuator by protecting electronic components from extreme media temperatures, maintaining 1/4" NPT connectivity integrity under continuous cycle service.

• Fail-Safe Security: The spring return actuator ensures the valve returns to the normally open position during power failures, preventing system stagnation.
• Enhanced Durability: Stainless steel trim and a robust thermal barrier allow for high-temperature fluid service, handling media from -22°F to 284°F.
• Precision Control: The equal percentage flow disk provides linear heat transfer, crucial for stable PID loop performance in air handlers and fan coils.
• Leak-Free Operation: Rated for ANSI Class IV leakage, the forged brass valve construction is tested for over 200,000 maintenance-free cycles.

Can this valve be used for steam applications?
Yes, because this model features stainless steel trim, it is rated for low-pressure steam service up to 15 psig. Models with brass trim are restricted to water and glycol only.

What is the purpose of the thermal barrier on this assembly?
The thermal barrier is essential for high-temp applications (above 212°F or for steam); it creates a temperature buffer to protect the 24V actuator from overheating, significantly extending the service life of the electronics.

Is this valve suitable for proportional signal control?
No, the VG1245AFH923BGA is designed for two-position (on/off) control. For 0-10VDC or 4-20mA modulating signals, a proportional actuator model (GGA) would be required.

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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.