Johnson Controls VG7842ST+72CHGA 2-Inch 3-Way Mixing Globe Valve Assembly with Spring Return Actuator

The Johnson Controls VG7842ST+72CHGA is a factory-assembled combination of a VG7842ST two-inch, three-way mixing globe valve and the VA7820-HGA-2 spring-return electric actuator. This complete valve assembly is engineered for precise flow regulation of hot water, chilled water, glycol solutions, and steam in commercial HVAC systems.

The VG7000 Series globe valve body features a cast bronze body with brass trim and NPT threaded end connections. With a flow coefficient (Cv) of 46.2, the three-way mixing configuration provides linear flow characteristics, making it well-suited for hydronic mixing and diverting applications in air handling units, fan coil units, and central plant equipment.

Key Features:

• Valve Size: 2-inch NPT threaded connections
• Configuration: Three-way mixing (3W)
• Flow Coefficient (Cv): 46.2
• Body Material: Cast bronze with brass trim
• Actuator: VA7820-HGA-2 spring-return, direct-coupled electric actuator
• Supply Voltage: 24 VAC
• Output Force: 180 lb-in torque
• Control Signal: Field-selectable — 0–10 VDC, 2–10 VDC, 0(4)–20 mA proportional; floating point; or two-position (On/Off)
• Stroke: 5/16 to 1 inch (8 to 25 mm) with automatic stroke adjustment
• Fail-Safe: Spring-return stem up (fail-open) on loss of power
• Position Feedback: 0–10 VDC output signal
• Manual Override: Included for easy commissioning and service
• Enclosure Rating: NEMA 2 / IP54
• Cable Length: 48 inches
• Media Temperature Range: Water: 35°F to 248°F (2°C to 120°C); Steam: up to 338°F (170°C) at 35 psig maximum
• Maximum Pressure Drop (Water): 30 psid for 2-inch valves
• Leakage Rating: ANSI Class IV (0.01% of maximum flow) per ANSI/FCI 70-2

The VA7820-HGA-2 actuator ships pre-configured for proportional 0–10 VDC control and can be field-reconfigured via DIP switches to floating or two-position control without additional hardware. The swing-gate yoke design allows for quick valve mounting and removal during maintenance. This valve assembly is ideal for hydronic heating and cooling distribution systems, air handling unit coil control, and building automation system integration.