Taco Flo-Chek valves prevent “gravity” circulation in forced hot water heating systems. Flo-Chek valves open automatically when the circulator starts running. Flo-Chek valves can also be used in systems with multiple circulator zones to allow heat to flow only into the zones calling for heat. In addition, the thumb screw can be opened manually for gravity feed applications if the primary circulator stops operating. They have a 125 psi maximum operating pressure (862 kPa) and 277°F maximum operating temperature (136°C).
