1" Cast Iron Hydronic Flo-Chek Valve

Taco 220-6 Hydronic Flo-Chek Valve – Professional Technical Information

The Taco 220-6 Hydronic Flo-Chek Valve is a precision-engineered control component designed for professional hydronic heating applications. It prevents unwanted gravity circulation in hot water systems during standby conditions while allowing controlled heat flow when required. The valve’s rugged cast iron construction, high-pressure capability, and reliable automatic operation make it suitable for commercial and residential hydronic installations utilizing forced hot water heating systems or multi-zone circulator configurations. Its design ensures efficient system performance and extended service life under demanding temperature and pressure conditions.

Technical Specifications

• Manufacturer: Taco Comfort Solutions
• Model Number: 220-6
• Product Type: Hydronic Flo-Chek Valve
• Connection Type: NPT (Female Threaded)
• Nominal Size: 1 inch
• Valve Orientation: Horizontal installation
• Body Material: Cast Iron
• Flow Design: Angle/Straight configuration
• Actuation: Automatic with manual thumb-screw bypass
• Medium Compatibility: Water (hydronic heating systems)
• Operating Pressure (Max): 125 PSI (862 kPa)
• Operating Temperature (Max): 277°F (136°C)
• Dimensions: 4-1/4 inch Width x 5 inch Height
• Mounting Position: Horizontal with arrow indicating flow direction
• Flow Control Function: Prevents gravity circulation when boiler is on standby
• Manual Operation: Thumb screw allows manual opening for gravity feed operation
• Service Type: Closed-loop hydronic heating systems
• Applications: Boilers with domestic hot water coils, multi-zone systems, baseboard heating loops
• Seal Material: High-temperature elastomer
• Compliance: Meets industry standards for hydronic heating components

Performance and Installation Features

• Prevents unwanted hot water circulation in hydronic systems when heating zones are inactive, improving system efficiency.
• Allows automatic flow control in multi-zone installations with independent circulators.
• Manual thumb-screw override permits gravity feed operation in case of pump failure or power outage.
• Engineered for continuous operation at pressures up to 125 PSI and temperatures up to 277°F.
• Cast iron body provides superior durability and corrosion resistance in closed-loop heating applications.
• Compact form factor enables straightforward installation within limited mechanical spaces.
• Compatible with a wide range of hydronic piping materials and system configurations.
• Internal mechanism designed for minimal flow resistance and reliable sealing during inactive circulation periods.
• Serviceable construction allows field maintenance and inspection without full system disassembly.
• Ensures energy savings by preventing waste heat transfer during system standby modes.

Professional Summary

The Taco 220-6 Hydronic Flo-Chek Valve provides professional contractors with a reliable solution for controlling unwanted gravity circulation in hydronic heating systems. Its cast iron construction, automatic actuation, and manual bypass option support operational flexibility across a range of boiler and zone configurations. Designed for continuous service under high temperature and pressure conditions, the 220-6 ensures consistent hydronic system performance, reduced standby losses, and increased energy efficiency. Ideal for multi-zone and year-round hot water systems, this valve is a trusted component in professional-grade hydronic installations.