Johnson Controls VG7241ST+823D00 Valve Assembly

The Johnson Controls VG7241ST+823D00 is a heavy-duty 2-way normally open pneumatic valve assembly designed for precise flow control in commercial HVACR systems. Built with a 2-inch NPT connection and a cast bronze body, this assembly features brass trim to ensure long-term reliability in water or steam applications. The unit utilizes an equal percentage flow characteristic with a 46.2 Cv rating, providing stable modulation even under varying pressure drops. Driven by a spring return pneumatic actuator with a 4-8 PSI spring range, it ensures a fail-safe open position upon loss of control air, making it a standard choice for chilled water and hot water systems requiring rigorous proportional control.

Key Benefits

• Fluid Compatibility: Engineered for hot water, chilled water, and steam applications up to 35 psig.
• Precise Modulation: The equal percentage plug profile allows for accurate heat transfer control across the entire stroke.
• Reliable Actuation: The Johnson Controls 823D00 actuator provides robust torque for consistent shut-off and positioning.
• Serviceability: The NPT threaded design and accessible packing nut allow for straightforward installation and field maintenance.
• Construction: Cast bronze body and high-quality internal trim minimize wear from cavitation and debris.

Common Questions

What is the fail-safe position of this assembly?
This is a normally open valve, meaning the spring return mechanism will drive the valve to the fully open position if pneumatic pressure is lost.

Can this valve be used for high-pressure steam?
The VG7241ST+823D00 is rated for saturated steam up to 381 degrees Fahrenheit, typically suited for low to medium pressure systems. Verify your specific pressure drop requirements against the 46.2 Cv rating.

What size air line is required for the actuator?
Standard pneumatic tubing is used, typically 1/4 inch, to provide the 4-8 PSI control signal to the pneumatic actuator.

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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.