Johnson Controls VG2831UM Valve

The Johnson Controls VG2831UM is a professional-grade 3-inch 3-way mixing globe valve designed for high-capacity hydronic applications in commercial HVACR systems. Built with a heavy-duty cast iron body and durable brass trim, this valve is engineered to regulate the flow of hot water, chilled water, or 50% glycol solutions with precision. It features a modified linear flow characteristic, providing stable control throughout the stroke, and is rated for a high flow coefficient of 80 Cv to handle significant volume in large-scale piping networks. The ANSI Class 125 flat-faced flange connection ensures a secure, leak-resistant fit compatible with standard industrial bolt patterns.

Designed for versatile HVAC valve actuation, the VG2831UM includes a 3/8" threaded stem that integrates seamlessly with various electric or pneumatic actuators. This mixing valve is capable of managing fluid temperatures from 35°F to 281°F and supports 35 psig saturated steam, making it a reliable choice for steam-to-water heat exchangers or campus-wide heating loops. For veteran contractors, the field-replaceable trim and ASME B16.1 compliance ensure this flanged mixing valve meets the rigorous demands of mechanical room specifications while maintaining an ANSI Class III shutoff leakage rating of 0.1% of maximum flow.

• Heavy-Duty Construction: The cast iron globe valve body provides superior structural integrity for ANSI Class 125 flanged systems.
• High Flow Efficiency: An 80 Cv rating allows for high-capacity mixing without excessive pressure drop across the 3-inch ports.
• Steam Compatibility: Engineered to handle 35 psig saturated steam and hot water up to 281°F for versatile district energy applications.
• Precise Control: Features a modified linear flow plug design that prevents hunting and ensures stable temperature regulation.
• Standardized Fit: The 3/8-inch threaded stem simplifies field assembly with Johnson Controls and compatible third-party actuators.

Can the VG2831UM be used for diverting service?
No, this model is specifically designed as a 3-way mixing valve. Proper piping requires two inlets and one outlet to blend fluid temperatures correctly; using it for diverting can lead to noise, vibration, and premature trim wear.

What is the maximum static pressure rating for this valve?
The valve is rated for a maximum static pressure of 175 psig for water temperatures up to 150°F, which decreases to 125 psig as temperatures approach 281°F.

Does this valve require specific gaskets for installation?
Yes, as an ANSI Class 125 flat-faced flange valve, it requires appropriate 3-inch flange gaskets (typically two per valve) to ensure a proper seal against mating piping.

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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.