Johnson Controls VG7842ES Valve

The Johnson Controls VG7842ES is a 1/2 inch NPT 3-way mixing globe valve engineered for precision control in pneumatic or electric HVAC systems. Featuring a 1.8 Cv flow coefficient and a linear flow characteristic, this valve ensures stable temperature modulation in hydronic heating and cooling applications. The cast bronze body and brass trim provide the necessary durability for high-cycle environments, while the small bonnet and slotted stem design facilitate seamless integration with Johnson Controls VA series actuators. Designed for mixing water or glycol solutions, the VG7842ES handles a wide temperature range, making it a reliable choice for fan coil units and reheat coils. Professional installers value this mixing globe valve for its robust NPT threaded connections and long-stroke design, which minimizes hunting and optimizes loop stability in commercial building automation systems.

Key Technical Benefits

• Precise Flow Control: The 1.8 Cv rating and linear bypass/mixing capability allow for accurate proportional control.
• Durable Construction: Cast bronze body and brass internals provide superior resistance to corrosion and wear in open or closed loops.
• Actuator Compatibility: Designed for use with VA-7310 or VA-4233 series actuators for direct-mount installation.
• Compact Footprint: The small bonnet design allows for installation in tight mechanical cabinets and plenum spaces.
• Versatile Application: Suitable for hot water, chilled water, and up to 50% glycol concentrations.

Common Installation Questions

What is the maximum fluid temperature rating for the VG7842ES?
This valve is generally rated for fluids ranging from 35°F to 281°F (2°C to 138°C), depending on the specific actuator and packing assembly utilized.

Can this valve be used for diverting applications?
The VG7842ES is specifically designed as a 3-way mixing valve. For diverting applications, ensure the flow enters through the two bottom ports and exits through the common port to prevent water hammer.

How do I verify the stem height for actuator calibration?
The slotted stem design allows for clear visual positioning. Ensure the actuator is calibrated to the specific stroke length of the VG7000 series to maintain tight shut-off.

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.