Johnson Controls VA7820-HGC-2 Actuator

The Johnson Controls VA7820-HGC-2 is a robust spring return electric valve actuator designed for the high-demand requirements of modern HVACR systems. As a veteran-grade globe valve actuator, this unit provides precise control for water and steam applications, specifically optimized for the VG7000 series. It features a versatile proportional control logic, accepting 0-10Vdc, 2-10Vdc, and 4-20mA signals, alongside floating and two-position capabilities. The 180 lb-in torque output and 5/16" to 1" stroke range ensure positive close-off and reliable modulation even in high-differential pressure environments. Designed with a stem-up fail-safe position, the internal spring mechanism provides a mechanical return during power loss to protect terminal equipment. This model includes a 48-inch halogen-free cable and a factory-calibrated SPDT auxiliary switch for end-stop position feedback. The brushless motor and force-controlled shut-off reduce component wear, while the manual override allows for straightforward commissioning and emergency positioning without requiring a power source.

• Multi-Signal Compatibility: Supports 0-10Vdc, 4-20mA, and floating signals for seamless integration into existing BAS and DDC architectures.
• Fail-Safe Protection: Reliable spring return action (stem up) ensures system safety during unexpected power interruptions.
• Heavy-Duty Performance: Delivers a consistent 180 lb-in torque to handle demanding globe valve applications with stroke lengths up to 1 inch.
• Enhanced Feedback: Includes an integrated SPDT auxiliary switch and 0-10Vdc position feedback for precise monitoring.
• Streamlined Installation: Features a unique swing-gate yoke for fast attachment and a 48" pre-wired cable to reduce field labor.

Common Questions

What valves are compatible with the VA7820-HGC-2?
This actuator is specifically engineered for Johnson Controls VG7000, VG8000, and VG9000 series globe valves. Using the appropriate mounting kits, it can also be adapted to certain competitive valve bodies from Honeywell and Barber Coleman.

How does the automatic stroke adjustment work?
Upon initial power-up, the VA7820-HGC-2 performs a calibration cycle. It detects the mechanical limits of the valve stroke and automatically scales the input signal across that range, ensuring 100% modulation accuracy without manual potentiometers.

Can the auxiliary switch be adjusted in the field?
The unit comes with one SPDT auxiliary switch. While fixed for specific signaling, it is designed to provide reliable end-of-stroke verification for sequencing or interlocking with pumps and fans.

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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.