Johnson Controls VA7820-HGA-2 Actuator

The Johnson Controls VA7820-HGA-2 Actuator is a high-torque, 24VAC spring return globe valve actuator designed for professional contractors managing complex HVAC and building automation systems. Delivering a robust 180 lb-in torque, this unit is engineered for the precise modulation of VG7000 Series Globe Valves and compatible series ranging from 1/2" to 2". It serves as a superior technical cross-reference for the VA-4233-AGA-2, offering enhanced flexibility through its field-selectable control logic. This direct-coupled actuator supports 0-10VDC, 2-10VDC, (0)4-20mA proportional, as well as floating and two-position control signals, ensuring seamless integration with diverse DDC controllers. The stem-up fail-safe mechanism provides critical system protection during power loss, while the integrated manual override simplifies commissioning and emergency manual positioning.

Key Professional Benefits

• Universal Control Compatibility: Easily switch between proportional, floating, and on/off control to match specific site requirements.
• High Seat Force: The 180 lb-in torque rating ensures reliable shut-off against high differential pressures in chilled water and steam systems.
• Industrial Build Quality: Tested for over one million cycles with corrosion-resistant components for long-term mechanical reliability.
• Simplified Installation: Features a threaded mounting collar and a 48-inch integrated cable to reduce field wiring time.
• Fail-Safe Security: Mechanical spring return (stem up) ensures valves return to a known safe state during outages.

Common Contractor Questions

What is the maximum stroke length for this actuator?
The VA7820-HGA-2 supports a stroke range of 5/16" to 1", making it compatible with a wide variety of globe valve bodies.

Can this unit handle steam applications?
Yes, when paired with stainless steel trim valves, this actuator is rated for steam control applications up to 100 psi.

Is this a direct replacement for the VA-4233 series?
The VA7820-HGA-2 is the recommended functional replacement for the VA-4233-AGA-2, providing identical mounting and superior signal versatility.

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.