Johnson Controls VG7243ET+821E00 Valve Assembly

The Johnson Controls VG7243ET+821E00 is a heavy-duty 2-way normally open pneumatic valve assembly designed for precise flow control in demanding HVAC applications. This unit features a 1/2-inch NPT connection and a 1.8 Cv equal percentage flow characteristic, ensuring stable modulating control for chilled water, hot water, or steam systems. The cast bronze body and stainless steel trim provide superior durability and resistance to scaling and corrosion, extending the service life of the valve plug and seat. Driven by a rugged 9-13 PSI spring range pneumatic actuator, the VG7000 series valve ensures reliable fail-safe operation via its spring return pneumatic actuator mechanism. This assembly is engineered for high-pressure close-off requirements and maintains tight shut-off integrity across varying thermal cycles, making it a standard choice for institutional and commercial hydronic system maintenance and upgrades.

Key Benefits

• Corrosion Resistance: The combination of a cast bronze body and stainless steel internal trim prevents premature wear in high-temperature steam and water loops.
• Precise Modulation: An equal percentage flow characteristic allows for consistent heat transfer and stable control loop performance.
• Fail-Safe Logic: The 9-13 PSI spring return ensures the valve defaults to the normally open position upon loss of control air, protecting against system freeze-ups or stagnation.
• Direct Compatibility: Designed for seamless integration with existing pneumatic control systems and standard 1/2" NPT piping configurations.
• Field Serviceability: The VG7000 series architecture allows for straightforward actuator removal and packing adjustments without total system teardown.

Common Questions

What is the maximum fluid temperature rating for this assembly?
This cast bronze valve body with stainless steel trim is typically rated for saturated steam up to 35 PSI and water temperatures reaching 281°F, depending on the specific packing material used.

Can the actuator be replaced without removing the valve from the line?
Yes, the Johnson Controls VG7000 series is designed with a universal bonnet that allows for pneumatic actuator replacement or maintenance while the valve body remains installed in the piping.

Is this valve suitable for steam applications?
Yes, the stainless steel trim makes the VG7243ET highly effective for steam service, offering significantly better protection against wire-drawing compared to brass trim alternatives.

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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.