Three-way zone valve Afriso AZV 643 GZ 1" (MPN 1664300)

Afriso AZV 643 GZ three-way zone valve with a 1" connection is a mechanical valve for controlling fluid routing in heating and HVAC zone systems. It is designed to provide reliable diversion or mixing of hot or chilled water within distribution circuits. The valve body and internal components are built to integrate with hydronic systems such as boiler loops, radiators, and fan coil units, where precise routing of flow between two outlets or from two inlets is required.

Advantages

The three-way design allows either mixing or diverting modes of operation to balance temperatures and flows in separate zones. A 1" connection size ensures compatibility with standard piping in residential and light commercial installations. The valve provides stable shutoff and smooth changeover between ports, reducing pressure disturbance in the circuit. Its construction supports typical hydronic media and operating temperatures used in central heating and HVAC systems.

Suitable for

• Diverting heated water from a boiler to different circuits
• Mixing return and supply flows to control supply temperature
• Zone control for radiators, underfloor heating, and fan coil units
• Hydronic balancing in small commercial and residential systems

Key specifications

• Function: three-way mixing/diverting valve
• Connection size: 1" (inch) threaded connections
• Intended media: water and typical hydronic heat transfer fluids
• Application: heating and HVAC zone control
• Mounting: inline installation within distribution piping

How to use

Install the valve in the piping run in the orientation specified by system design, connecting the 1" threaded ports to the supply, return and zone lines as required for mixing or diverting operation. Commission the valve together with the actuator and control system: ensure correct actuator stroke, configure control signals and verify leak-tight connections. Adjust system controls and thermostats to achieve the desired temperature setpoints and confirm proper flow routing through the valve under operating conditions.

Usage recommendations

Use compatible actuators and controls appropriate for three-way operation, and follow local standards for hydronic installations. Flush the piping before installation to prevent debris from entering the valve. Periodically check for leaks and proper actuator response as part of routine system maintenance.