Caleffi's 644 Series Motorized Ball Zone Valves (0.92 MB) provide zone control for applications requiring high flow rates (to 13 Cv) and high close-off pressures (to 150 psi).Standard 2-way on/off flow and 3-way diverting flow models are available as well as a unique 3-way bypass configuration that switches between primary and bypass flow ports to prevent pump dead heading.
A durable, energy efficient 24 volt 3-wire control actuator provides traditional two-position action, or can be combined with any 3-wire floating controller for outdoor reset on radiant systems. High electrical efficiency allows for nine valves on a standard 40 VA transformer. The 644 Series zone valves come in ½”, ¾”, and 1” sizes with NPT or sweat union connections.
For more information, refer to our Technical Trainer (3.49 MB), email us at sales@caleffi.com, or call (414) 238-2360.
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