Johnson Controls VG7241ST+3008EP Valve Assembly

The Johnson Controls VG7241ST+3008EP is a 2-way normally open valve assembly engineered for precise modulating control in commercial HVAC systems. This 2-inch NPT valve features a cast bronze body with durable brass trim, providing a robust 46.2 Cv rating with an equal percentage flow characteristic. The integrated spring return pneumatic actuator operates on a 9-13 PSI spring range and includes a positioner to ensure accurate valve positioning even under varying differential pressures. This pneumatic control valve is designed for chilled or hot water applications, maintaining system stability during power loss by defaulting to the open position. Contractors utilizing Johnson Controls VG7000 series components will find this assembly maintains tight shutoff and reliable performance in demanding hydronic loops. The exposed actuator design allows for straightforward field inspections and maintenance, making it a standard choice for building automation systems requiring high-flow mixing or throttling service.

Key Benefits

• High Flow Capacity: The 46.2 Cv rating accommodates high-volume hydronic systems without excessive pressure drop.
• Precision Modulation: The factory-installed positioner ensures the equal percentage flow curve is strictly maintained for linear heat transfer.
• Fail-Safe Operation: The 9-13 PSI spring return mechanism guarantees the valve returns to the open position upon loss of control air.
• Durable Construction: The cast bronze body and brass trim offer superior corrosion resistance and longevity in standard HVAC fluids.

Common Questions

What is the maximum fluid temperature for the VG7241ST+3008EP?
This assembly is typically rated for saturated steam up to 38 psig or water temperatures ranging from 35°F to 281°F, depending on the specific packing used inside the bronze body.

Can the actuator be replaced without removing the valve body?
Yes, the VG7000 series design allows for the pneumatic actuator and positioner assembly to be serviced or replaced while the valve body remains in the piping system.

How does the positioner improve performance?
The positioner eliminates hysteresis and overcomes friction in the valve stem packing, ensuring the valve plug reaches the exact position commanded by the pneumatic controller regardless of load changes.

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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.