Description
The Johnson Controls VA7830-HGC-2 is a high-performance, direct-coupled globe valve actuator engineered for precise flow control in commercial HVAC and building automation systems. Featuring spring return (stem down) fail-safe operation and a robust 180 lb-in torque output, this actuator is built to handle demanding hydronic and steam valve applications with reliability and accuracy.
Control Flexibility
The VA7830-HGC-2 supports multiple control modes, making it compatible with a wide range of building automation and control systems:
- Two-Position control
- Floating 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″
- Actuator Type: Direct Coupled Globe Valve Actuator
- Spring Return: Stem Down (fail-safe)
- Auxiliary Switch: 1 SPDT
- Manual Override: Included
Spring Return & Fail-Safe Operation
The spring return mechanism ensures the actuator returns the valve to the stem-down (closed or open, depending on valve configuration) fail-safe position upon loss of power. This is critical for protecting hydronic systems, coils, and building infrastructure during power interruptions.
Manual Override
An integrated manual override allows technicians to manually position the valve during commissioning, maintenance, or emergency scenarios — without requiring electrical power to the actuator.
Auxiliary Switch
The included 1 SPDT (Single Pole Double Throw) auxiliary switch provides end-of-travel feedback signaling, enabling integration with control panels, DDC systems, or alarm circuits for enhanced system monitoring.
Direct Coupled Design
The direct-coupled design eliminates the need for couplings, linkages, or brackets, simplifying installation and reducing potential points of failure. The 48″ lead cable provides ample reach for clean, professional wiring in mechanical rooms and air handling unit installations.
Ideal Applications
- Commercial HVAC hydronic systems
- Air handling units (AHUs) and fan coil units (FCUs)
- Steam and hot water coil control
- Building automation and DDC control systems
- Variable flow and two-position valve control
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