Description
Overview
The Johnson Controls VA7820-HGA-2 is a direct-coupled, spring return globe valve actuator engineered for demanding commercial and industrial HVAC hydronic systems. Designed for reliable valve control in heating and cooling applications, this actuator delivers precise positioning with multiple control signal options and a robust spring-return fail-safe mechanism.
Control Modes
- Two-position (on/off) 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″
- Spring return direction: Stem Up (direct coupled)
- Fail-safe: Spring return on power loss
- Manual override included for commissioning and emergency operation
Features & Benefits
- Direct-coupled design simplifies installation and eliminates linkage adjustments
- Spring return stem-up action provides reliable fail-safe positioning on power loss
- Supports multiple industry-standard control signals for broad system compatibility
- High 180 lb-in torque rating handles demanding valve loads with ease
- Manual override allows technicians to position the valve without power during startup or service
- Wide stroke range (5/16″ to 1″) accommodates a variety of globe valve body sizes
- 48″ cable provides flexible routing in tight mechanical spaces
Typical Applications
- Commercial HVAC hydronic heating and cooling coil control
- Building automation and energy management systems
- Variable flow chilled water and hot water systems
- Air handling units and fan coil units
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