219-4 Taco 3/4" Sweat Bronze Flow Check Valve

• Flow Check Valve
• Type Horizontal
• Normal Condition Close
• Nominal Size 3/4"
• End Connection Soldered x Soldered
• Overall Length 3-3/8"
• Temperature Rating 277 Deg F
• Pressure Rating 125 PSI
• Body Material Bronze
• Application Hot Water Heating System, Water/Glycol
• CV Rating 2.5
• Warranty 1 Year

Taco Flo-Checks Prevent Gravity Circulation in 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 Domestic Hot Water Year-Round in System with Multiple Circulator Zones, Flo-Checks Allow Heat to Flow Only Into the Zones that are Calling for Heat; Thumb Screw can be Manually Opened for Gravity Feed Applications if the Main Circulator Stops Operating; Taco Flo-Checks Open Automatically when the Circulator Starts Running when the Room Thermostat is Satisfied and the Circulator is Stopped the Flo-Checks 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 in Systems with Multiple Zones "Ghost Flow" may Occur if a Flo-Check 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; 1 Year Warranty