Description
The Johnson Controls VA7820-HGC-2 is a heavy-duty, direct-coupled globe valve actuator engineered for precise flow control in commercial HVAC and building automation applications. Featuring spring return stem-up fail-safe operation and a robust 180 lb-in torque output, this actuator delivers reliable, repeatable performance across a wide range of hydronic and process control systems.
Control Flexibility
The VA7820-HGC-2 supports multiple control modes to integrate seamlessly into virtually any BAS or DDC system:
- Two-position on/off control
- Floating (tri-state) control
- Proportional control via 0–10 Vdc signal
- Proportional control via 2–10 Vdc signal
- Proportional control via (0)4–20 mA signal
Key Specifications
- Supply Voltage: 24 Vac
- Torque Output: 180 lb-in
- Stroke Range: 5/16″ – 1″
- Cable Length: 48″
- Fail-Safe Action: Spring Return, Stem Up
- Mounting: Direct Coupled to Globe Valve
- Auxiliary Switch: 1 SPDT (included)
- Manual Override: Yes
Spring Return Fail-Safe Operation
The integrated spring return mechanism ensures the actuator drives the valve to the stem-up (open or closed, depending on valve configuration) fail-safe position upon loss of power or control signal — a critical safety feature for chilled water, hot water, and steam coil applications.
Manual Override
A built-in manual override allows technicians to manually position the valve during commissioning, maintenance, or emergency situations without requiring power to the actuator — saving time and reducing service complexity.
Auxiliary Switch
The included 1 SPDT auxiliary switch provides end-of-travel feedback for interlocking with fans, pumps, or other system components, enabling coordinated sequencing and enhanced system protection.
Direct Coupled Design
The direct-coupled mounting eliminates the need for couplers, brackets, or linkages, simplifying installation and reducing potential points of mechanical failure. Compatible with globe valve stems ranging from 5/16″ to 1″ stroke.
Ideal Applications
- Commercial AHU heating and cooling coil control
- Chilled water and hot water distribution systems
- Building automation and DDC systems
- Variable flow hydronic systems
- Fan coil unit valve control
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