Johnson Controls VG2831UM292NGGC Valve Assembly

The Johnson Controls VG2831UM292NGGC Valve Assembly is a heavy-duty, 3-inch 3-way mixing globe valve designed for precise fluid control in high-capacity commercial HVAC systems. Engineered with a robust cast iron body and durable brass trim, this assembly utilizes a modified linear flow characteristic to ensure stable modulation of hot water, chilled water, or 50% glycol solutions. For steam applications, the unit handles up to 35 psig saturated steam at 281°F, making it a reliable choice for diverse mechanical room requirements. The ANSI Class 125 flat-faced flange connection simplifies installation into existing piping networks, while the 3/8-inch threaded stem provides a secure mechanical interface for the high-torque actuator.

This configuration features a factory-mounted Spring Return Tandem Mount Actuator, providing fail-safe protection and 177 in-lb of torque. The control versatile logic supports 0-10Vdc, 2-10Vdc, or 4-20mA signals (via the included 500-ohm resistor), operating on standard 24Vac/Vdc power. Dual integrated auxiliary switches are included for remote position feedback or interlocking with circulating pumps and fans. With an 80 Cv flow coefficient and a leakage rating of only 0.1% of maximum flow, this motorized mixing valve maximizes energy efficiency and thermal stability across the entire stroke.

• Fail-Safe reliability: The tandem spring return actuator ensures the valve moves to a safe position during power loss.
• Precise Modulation: Modified linear flow characteristics prevent hunting and provide smooth temperature control in hydronic heating and cooling.
• Industrial-Grade Construction: Cast iron body with brass internal trim withstands the demands of large-scale building automation systems.
• Integrated Feedback: Two factory-installed auxiliary switches allow for seamless system monitoring without additional field-mounted gear.
• High Rangeability: Maintains controllable flow at a 7.7:1 ratio, optimizing performance even during low-load conditions.

What is the maximum fluid temperature for this assembly?
The valve is rated for fluid temperatures ranging from 35°F to 281°F, and it can handle saturated steam up to 35 psig.

Can this valve be used for diverting applications?
No, this is a 3-way mixing valve designed to take two inlet flows and mix them into a single outlet. Using a mixing valve for diverting can cause premature wear and noise due to improper flow direction across the plug.

Does this unit require a separate controller for the 4-20mA signal?
The actuator accepts 4-20mA directly when the provided 500-ohm resistor is utilized, making it compatible with most standard HVAC controllers and PLCs.

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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.