Product Overview

Shut-off valve
Thermostatic valve
Manual valve
Electric pump
Room thermostat
Differential by-pass
Air vent valve
Differential by-pass
valve
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RT
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CALEFFICALEFFI
CALEFFI
System with 6442 series two-way zone valves and differential by-pass valve
The system works with variable flow rate and it is necessary to keep the pressure differential generated by the zone valves closing under control.
This increase, which can reach unacceptable limits for the system to work properly, creates an increase in the flow rate to the circuits still open and
can result in problems for the pumps and the boiler. It is therefore necessary to keep the pressure differentials under control by means of differential
by-pass valves or variable speed pumps.
Application diagrams
In systems with zone control, the zone valve shuts off the circuits serving the heat exchanger terminal emitters when the temperature in the room
reaches the desired temperature set point on the thermostat. Switching off this circuit can, however, cause changes in pressure and flow rate
throughout the system. Therefore, it is essential to make sure these changes are kept under control within acceptable limits.
System with code 6443.. 3BY three-way zone valve with by-pass