Johnson Controls VG2831VM Valve

The Johnson Controls VG2831VM is a heavy-duty 4-inch 3-way mixing globe valve designed for precise flow control in demanding hydronic systems. This unit features an ANSI Class 125 flat-faced flange connection and a robust cast iron body, engineered to handle significant pressure drops in commercial HVACR applications. With a flow coefficient of 157 Cv and a modified linear flow characteristic, it ensures stable modulation for chilled water, hot water, or 50% glycol solutions. The internal assembly utilizes brass trim and a 3/8-inch threaded stem, providing reliable seating and long-term durability under high-duty cycles. Designed for seamless integration with pneumatic or electric actuators, the VG2831VM is a direct solution for contractors requiring precise mixing ratios in large-scale air handling units or central plant operations. This series is known for its high rangeability and bolt-on compatibility, making it a standard choice for terminal unit control and building automation systems.

• High Flow Capacity: Rated at 157 Cv for efficient volume management in large-diameter piping.
• Durable Construction: Cast iron body with brass trim provides superior resistance to mechanical wear.
• Precise Modulation: Modified linear flow profile prevents hunting and stabilizes temperature control.
• Industry Standard Flanges: ANSI Class 125 flat-faced configuration ensures easy alignment and leak-free installation.
• Universal Stem Interface: 3/8-inch threaded stem allows for versatile actuator mounting options.

Common Questions & Technical Support

How do I select the correct actuator for the VG2831VM? This valve requires an actuator capable of managing the 3/8-inch stem stroke and overcoming the close-off pressure specific to your system's pump head. Check the seating force requirements against your specific pneumatic or electronic controller.

Can this valve be used for steam applications? The VG2831VM is primarily designed for water and glycol mixtures. For high-pressure steam, verify that the brass trim and packing material meet your specific temperature and pressure ratings.

What is the benefit of the mixing configuration in this model? The 3-way mixing design allows for two inlets and one common outlet, making it essential for bypass or blending circuits where constant flow is required through the system loop while modulating temperature to the coil.

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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.