VG7842LT+423GGA Johnson Controls Valve / Actuator

Overview

The Johnson Controls VG7842LT+423GGA is a high-performance valve and actuator assembly that combines a 3/4-inch 3-way bronze globe mixing valve with a VA-4233-GGA-2 spring-return electric actuator. Designed to accurately regulate the flow of water and steam in commercial HVAC systems, this assembly provides precise proportional control in response to signals from building automation systems. In the event of a power failure, the integrated spring mechanism automatically returns the valve to the full stem-up position to ensure system safety.

Features

• Automatic spring return safely drives the valve to the full stem-up position during power losses.
• Simple, no-linkage direct mounting reduces installation time and simplifies field or factory setup.
• AUTO stroke calibration on the proportional model eliminates the need for manual adjustments.
• Noise-filtering technology on the control signal prevents unneeded repositioning from line interference.
• Reversible stroke direction allows switch-selectable direct or reverse action for operational flexibility.
• Integral position indicator provides clear visual confirmation of the valve stem’s status.
• Manual hand crank allows for positioning independent of the power supply.

Specifications

• Valve Size: 3/4 inch
• Connection Type: Female NPT (Threaded)
• Flow Capacity: 7.3 Cv
• Valve Type: 3-Way Mixing Configuration
• Body Material: Cast Bronze (ANSI Class 250 pressure rating)
• Trim Material: Brass with a stainless steel stem
• Actuator Model: VA-4233-GGA-2
• Supply Voltage: 24 VAC/VDC
• Control Input Signal: Field-selectable Proportional (0-10 VDC, 2-10 VDC, 6-9 VDC, 0-20 mA, or 4-20 mA)
• Torque/Force Output: Minimum 61 lb-f (271 N)
• Close-Off Pressure: 132 psi
• Enclosure Rating: NEMA 2, IP42
• Operating Temperature Limits: 32°F to 122°F (0°C to 50°C) ambient

Applications

• Regulating flow in chilled water and hot water HVAC systems.
• Proportional control in environmental system applications utilizing up to a 50% glycol solution.
• Saturated steam applications up to 15 psig.
• Commercial building automation architectures requiring reliable mixing valve configurations.