Johnson Controls VG7241ST+3008BP Valve Assembly

The Johnson Controls VG7241ST+3008BP is a 2-way normally open pneumatic globe valve engineered for precision control in low-pressure steam and hot or chilled water applications. Featuring a 2-inch NPT connection and a 46.2 Cv rating, this assembly utilizes an equal percentage flow characteristic to maintain stable modulating control even under fluctuating system pressures. The valve body is constructed from durable cast bronze with brass trim, ensuring longevity in demanding mechanical environments. It is paired with an exposed pneumatic actuator featuring a 3-6 PSI spring range and an integrated positioner for high-accuracy stem positioning and repeatable performance. This configuration is ideal for contractors managing HVAC zone control or commercial boiler systems requiring reliable spring return fail-safe operation. The VG7000 series design facilitates straightforward field maintenance and integration with existing pneumatic control systems, providing a robust solution for rigorous terminal unit and coil applications.

Key Benefits

• Precision Modulation: The equal percentage flow design provides consistent control loop stability across varying load demands.
• Rugged Construction: Cast bronze body and brass trim offer excellent resistance to corrosion and wear in hydronic systems.
• Fail-Safe Reliability: The normally open spring return actuator ensures the valve returns to its default position during power or signal loss.
• Enhanced Accuracy: The factory-mounted valve positioner eliminates hysteresis and ensures the stem responds accurately to control signals.

Common Questions

What is the maximum fluid temperature for the VG7241ST series?
These valves are typically rated for saturated steam up to 338°F and water applications ranging from 35°F to 281°F, depending on the specific packing material used.

Can the actuator be swapped for an electronic model in the field?
While the VG7000 series is modular, this specific assembly is optimized for pneumatic control. Converting to electronic actuation would require a compatible linkage kit and a Johnson Controls VA series actuator.

How does the positioner improve system performance?
The 3008BP positioner compensates for stem friction and unbalanced fluid forces, ensuring the valve reaches the exact position commanded by the pneumatic controller.

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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.