2" Universal Hydronic Flo-Chek Valve

Taco 223-5 Hydronic Flo-Chek Valve – Professional Technical Information

The Taco 223-5 Hydronic Flo-Chek Valve is designed for use in commercial and residential hydronic heating systems to prevent unwanted gravity circulation during standby operation. This valve provides precise flow control, ensuring that heat is delivered only to active zones while maintaining system efficiency. Constructed from heavy-duty cast iron, the 223-5 offers reliability and durability under demanding conditions. Its automatic actuator and manual bypass functionality provide flexible control for both standard forced circulation and gravity feed applications, supporting water or glycol-based heating systems.

Technical Specifications

• Manufacturer: Taco Comfort Solutions
• Model Number: 223-5
• Product Type: Hydronic Flo-Chek Valve
• Flow Configuration: Universal – Angle/Straight
• Nominal Size: 2 inches
• Connection Type: NPT (Female Threaded)
• Body Material: Cast Iron
• Actuation Type: Automatic with manual thumb-screw bypass
• Working Medium: Water or water/glycol mixture
• Operating Pressure (Max): 125 PSI (862 kPa)
• Operating Temperature (Max): 277°F (136°C)
• Valve Orientation: Horizontal installation
• Dimensions: 6-3/4 inch Width x 7 inch Height
• Seal Type: High-temperature elastomer seals
• Service Type: Hydronic heating systems – residential or commercial
• Mounting Position: Directional, arrow cast in body indicates proper flow direction
• Control Feature: Manual opening for gravity flow operation during circulator failure
• Medium Compatibility: Compatible with standard boiler water and glycol mixtures
• System Compatibility: Multi-zone systems with independent circulators
• Construction Standard: Engineered to meet industry hydronic control specifications

Performance and Installation Features

• Prevents gravity circulation in hot water systems when the heating zone is inactive.
• Allows boiler operation for domestic hot water maintenance without heating distribution zones.
• Enables controlled heat flow in multi-circulator systems, isolating inactive zones to increase efficiency.
• Equipped with a manual thumb-screw bypass for gravity feed during circulator or power failure.
• Durable cast iron body withstands continuous service under elevated pressure and temperature conditions.
• Field-proven automatic actuator mechanism ensures long-term operational reliability with minimal maintenance.
• Simple installation with threaded NPT connections for fast integration into existing hydronic piping systems.
• Suitable for both closed-loop heating and recirculation systems using water or glycol-based fluids.
• Compact design supports installation in tight mechanical spaces without compromising accessibility.
• Improves energy efficiency by eliminating unnecessary heat transfer during standby operation.

Professional Summary

The Taco 223-5 Hydronic Flo-Chek Valve provides professional contractors with a dependable and efficient solution for controlling unwanted circulation in hydronic heating systems. Its cast iron construction, automatic operation, and manual bypass capability ensure superior performance in both standard and emergency flow conditions. Designed for compatibility with multi-zone configurations and high-temperature, high-pressure applications, the 223-5 supports long-term operational stability and system efficiency. Engineered for professional-grade installations, it remains a trusted component for hydronic heating systems requiring precision flow management and reliable service life.