Taco Hydronic Flo-Chek Valve, Universal, 1-1/2 inch Nominal Size, NPT, 125 psi, 277 degree Fahrenheit, Mediameter Water/Glycol, Automatic Actuator, Cast Iron Body, 6 inch Width x 6-13/32 H
Taco Flo-Cheks prevent &; circulation inch forced hot water heating systems during periods when the boiler is hot, but the space heating zone is not wanted. This makes it possible to use the heating boiler to maintain hot water year-round. You can also use Flo-Cheks inch systems with multiple circulator zones to allow heat to flow only into the zones that are calling for heat. inch addition, the thumb screw can be opened manually for gravity feed applications, if the main circulator stops operating. 125 psi maximum operating pressure (862 kPa) and 277 degree Fahrenheit maximum operating temperature (136 degree C).
In systems with multiple zones, "ghost flow" may occur if a Flo-Chek is not installed on each zone
Ghost flow is induced when a circulator on one zone is running but is still able to bypass water through a zone that is not calling, due to a differential in piping resistance between the two zones
57.9 ft resistance of pipe equivalent
23.5 Cv
Flo-cheks open automatically when the circulator starts running
When the room thermostat is satisfied and the circulator is stopped
The flo-cheks close immediately, preventing gravity circulation
Gravity circulation of water is induced by the difference in specific weight or density of the hot water in the vertical supply pipe and the cold water in the vertical return pipe
The lighter hot supply side water, which naturally wants to rise, is drawn up and around the system by the pulling down effect of the heavier cold water in the vertical return pipe
The amount of gravity circulation is dependent on the height of the system and the differential between the hot and cold temperatures
