Taco, 329-3, Pressure Reducing Valve, 1/2 in, C x FNPT, Cast Iron

Taco 1/2″ Boiler Feed Valve – Cast Iron Pressure Regulator for Hydronic Heating Systems

The Taco 329-T boiler feed valve is a rugged, cast iron automatic fill valve designed to maintain consistent water pressure in closed-loop hydronic heating systems. Engineered for reliable performance, it automatically adds water to the system as needed, preventing pressure drops that could damage components or reduce efficiency.

Purpose-Built for Closed-Loop Boiler Applications

With a factory-set pressure of 12 psi and an adjustable range from 10 to 25 psi, this valve accommodates a wide variety of residential and light commercial system requirements. The fast fill feature and built-in check valve provide added safety and operational convenience. Its compact, heavy-duty construction ensures long service life under demanding system conditions.

Key Product Features

• Automatic Pressure Regulation – Maintains system pressure at the set level without manual intervention.
• Fast Fill Lever – Speeds up system filling after installation or maintenance, with manual override control.
• Integrated Check Valve – Prevents reverse flow if supply pressure drops, safeguarding the system.
• Adjustable Pressure Setting – Customize output between 10–25 psi to suit specific system requirements.
• Cast Iron Body with Brass Internals – Built for durability and corrosion resistance in high-temp boiler environments.

Technical Specifications

• Inlet Size: 1/2″ Sweat
• Outlet Size: 1/2″ FNPT
• Factory Pressure Setting: 12 psi
• Adjustable Range: 10–25 psi
• Maximum Working Pressure: 100 psi
• Max Temperature: 212°F
• Body Material: Cast Iron
• Overall Length: 4-1/4″
• Height: 3-3/4″
• Warranty: 1 Year

Installation Considerations

This valve is designed for sweat inlet and threaded outlet connections and is typically installed between the cold water supply and the boiler return line. Installation should be performed by qualified professionals familiar with local codes and proper system pressurization techniques. Use of appropriate backflow prevention is strongly recommended where required by code.

For the Field Professional

Contractors value the Taco 329-T for its dependable pressure control and ease of service. The lever lockout prevents unintentional tampering, while the quick-fill function reduces time spent on system refills. Its compact form makes it ideal for tight mechanical rooms and retrofit jobs.

Summary

The Taco 1/2″ Cast Iron Pressure Reducing Boiler Feed Valve delivers long-lasting performance in hydronic heating systems, helping maintain consistent boiler pressure and system efficiency. Built to professional standards, this valve is a proven solution for system protection and operational reliability.