3/4" Hydronic Flo-Chek Valve, Horizontal by Taco.

Taco 219-4 Bronze Hydronic Flo-Chek Valve – Professional Technical Information

The Taco 219-4 Bronze Hydronic Flo-Chek Valve is engineered for precise flow control in hydronic heating systems, ensuring stable performance and energy efficiency. Designed for horizontal installations, this valve prevents unwanted gravity circulation when zones are inactive, allowing the boiler to maintain hot water availability year-round. Its bronze construction provides excellent corrosion resistance and thermal durability, making it ideal for potable water and glycol-based systems. The 219-4 features an automatic actuator and manual thumb-screw for gravity feed operation, ensuring reliable functionality in both standard and emergency conditions.

Technical Specifications

• Manufacturer: Taco Comfort Solutions
• Model Number: 219-4
• Product Type: Hydronic Flo-Chek Valve
• Configuration: Straight, Horizontal
• Nominal Size: 3/4 inch CTS
• Connection Type: Sweat (C x C)
• Body Material: Bronze
• Actuation Type: Automatic with Manual Thumb-Screw Bypass
• Medium: Water or Water/Glycol Mixtures
• Mounting Orientation: Horizontal Flow
• Operating Pressure (Maximum): 125 PSI (862 kPa)
• Operating Temperature (Maximum): 277°F (136°C)
• Flow Direction: Directional Arrow Cast on Valve Body
• Dimensions: 3-3/8 inch Width x 3-3/32 inch Height
• Seal Material: High-Temperature Elastomer
• Manual Override: Integrated Thumb Screw for Gravity Feed Operation
• System Compatibility: Hydronic Heating and Domestic Hot Water Circulation Systems
• Installation Type: Solder/Sweat Joint Connection
• Finish: Natural Bronze – Corrosion and Scale Resistant
• Certifications: Rated for Hydronic Heating System Applications

Performance and Application Features

• Prevents gravity circulation in hydronic heating systems when the heating zone is not active.
• Allows continuous boiler operation for domestic hot water while isolating inactive heating zones.
• Automatic actuator ensures dependable, maintenance-free control of hydronic flow.
• Manual thumb-screw enables gravity feed circulation in the event of pump failure or maintenance requirements.
• Constructed from bronze for superior corrosion resistance in potable or glycol-based systems.
• Designed for horizontal installation with sweat-end connections for quick and secure soldering.
• Operates under high temperature and pressure conditions for residential or light commercial systems.
• Compatible with multi-zone hydronic configurations requiring controlled flow and backflow prevention.
• Compact body design provides easy installation and service accessibility in tight piping layouts.
• Improves overall system efficiency by eliminating unwanted heat migration during standby operation.

Professional Summary

The Taco 219-4 Bronze Hydronic Flo-Chek Valve is a precision-engineered control component designed for professionals requiring dependable flow regulation in hydronic heating and hot water systems. With a corrosion-resistant bronze body, sweat connections, and an automatic actuator with manual override, it offers long-term reliability and operational flexibility in demanding thermal applications. Rated for 125 PSI and 277°F, the 219-4 is ideal for use in multi-zone systems, providing consistent hydronic control and protection against unwanted gravity circulation while supporting efficient year-round operation.