Caleffi 644269a 2-way Zone Valve 1 Inch Sweat 24V

Product Description

The CALEFFI 644269a is a 2-way zone valve designed for hydronic heating and cooling systems. It operates on 24 volts and features a 1-inch sweat (SWT) connection, making it compatible with standard copper piping installations. With a flow coefficient (Cv) of 13, it delivers reliable flow control for residential and light commercial zoning applications. Licensed plumbers and HVAC technicians install this valve to isolate or regulate flow within a zoned hydronic loop, ensuring precise temperature management across individual zones without affecting the rest of the system.

This valve is suited for residential and light commercial hydronic systems where zone-by-zone flow control is required. The 1-inch sweat end connections are standard for copper piping used in hot water heating and chilled water cooling distribution. The 24-volt actuator makes it compatible with low-voltage zone controls and thermostats commonly used in forced-hot-water and radiant heating setups. HVAC and plumbing contractors typically install this valve as part of a multi-zone hydronic system controlled by a zone panel or relay board.

Key Features

• 2-way design for on/off hydronic zone control
• 1-inch sweat (SWT) end connections for standard copper piping
• 24-volt actuator compatible with low-voltage zone controls and thermostats
• Cv of 13 for dependable flow capacity across residential and light commercial zones
• Compact actuator design suited for tight mechanical room installations

Compatibility

Designed as an OEM-style replacement for 2-way hydronic zone valves with 1-inch sweat connections and 24-volt actuators in residential and light commercial heating and cooling systems.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician. Shut off system water supply and depressurize the piping before soldering sweat connections, keeping heat away from the valve body and actuator. Disconnect power to the zone control panel before wiring the 24-volt actuator leads. Follow local plumbing codes and the IFGC or IPC as applicable for hydronic system service and pressure testing after installation.

Technical Specifications

• Valve Configuration: 2-Way
• Connection Type: 1 inch Sweat (SWT)
• Actuator Voltage: 24 volts
• Flow Coefficient (Cv): 13

Standard Information

• Brand: CALEFFI
• Manufacturer Part Number: 644269a