Johnson Controls VG2831UN Valve

The Johnson Controls VG2831UN is a heavy-duty 3-way mixing globe valve engineered for precision control in large-scale chilled or hot water hydronic systems. Featuring a 3-inch ANSI Class 125 flat-faced flange connection, this valve is built with a rugged cast iron body and durable brass trim to withstand demanding mechanical room environments. With an 80 Cv rating and a modified linear flow characteristic, it ensures stable proportional control and minimizes hunting in high-flow applications. The 1/2-inch threaded stem is designed for seamless integration with pneumatic or electric actuators, providing the high close-off pressure required for balanced HVAC piping systems. This mixing valve is a standard-tier solution for maintaining setpoint temperatures in air handling units and heat exchangers where reliable flanged globe valve performance is non-negotiable for system efficiency and long-term hydronic flow control.

• Enhanced Flow Control: The modified linear flow characteristic optimizes heat transfer efficiency and prevents thermal shock in large loops.
• Industrial Construction: Cast iron body and brass internal trim provide superior resistance to corrosion and mechanical wear.
• Universal Compatibility: Standard ANSI Class 125 flanging allows for direct replacement in existing commercial HVAC systems without extensive repiping.
• High Close-Off Reliability: Designed to maintain tight shut-off integrity when paired with appropriately torqued Johnson Controls actuators.

What is the maximum fluid temperature rating for the VG2831UN?
This valve is typically rated for water temperatures ranging from 35°F to 281°F, making it suitable for both chilled water and low-pressure steam or hot water applications.

Can this valve be used for diverting applications?
The VG2831UN is specifically designed as a mixing valve (two inlets, one outlet). Using it for diverting purposes may result in chatter or reduced service life; always verify the piping configuration before installation.

Which actuators are compatible with the 1/2-inch threaded stem?
It interfaces directly with Johnson Controls VA-series and M-series actuators that support a 3/4-inch stroke and provide sufficient force to overcome the 80 Cv flow pressure.

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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.