1/2" x 1/2" Cast Iron Pressure Reducing Valve (Threaded)

Dependable Water Pressure Control – Taco® 329-T3 Cast Iron Pressure Reducing Valve

The Taco® 329-T3 is a heavy-duty pressure reducing valve engineered to maintain consistent water pressure in closed-loop hydronic heating systems. Built from rugged cast iron and rated for performance in demanding environments, this valve is a reliable choice for professional contractors who need durability, control, and long-term system protection.

With an integrated fast-fill lever, built-in check valve, and adjustable pressure settings, the 329-T3 simplifies installation and system maintenance while preventing issues caused by over-pressurization or sudden pressure loss. Whether you're commissioning a new system or replacing a worn component, this valve delivers the control and dependability your work demands.

Product Highlights

• Adjustable Pressure Range: Factory pre-set at 12 psi, adjustable between 10–25 psi to meet specific system requirements.
• Fast Fill Lever with Lock: Enables manual override for rapid filling during startup or maintenance, then locks out for safety.
• Internal Check Valve: Prevents system drainback in the event of supply pressure failure, preserving system pressure integrity.
• Threaded Inlets: 1/2" NPT female connections for compatibility with standard piping configurations.
• Cast Iron Body: Durable and corrosion-resistant construction, suitable for closed hydronic heating systems.

Technical Specs

• Material: Cast Iron Body with Brass Internals
• Connection Size: 1/2" NPT Inlet and Outlet
• Adjustable Pressure: 10 – 25 psi (factory set at 12 psi)
• Max Inlet Pressure: 100 psi
• Application: Closed-loop hydronic heating systems

Installation Guidelines

Proper installation is critical for reliable operation. While the Taco 329-T3 is designed for straightforward in-line installation, it must be oriented correctly and adjusted carefully based on system requirements. For best results and code compliance, installation should be performed by a licensed contractor familiar with hydronic system design.

Contractor-Focused Advantages

For Installers: The adjustable pressure setting and fast-fill lever help speed up commissioning while ensuring precise control. Built-in check functionality eliminates the need for an additional backflow device, saving time and reducing material costs on the job.

For Service Techs: The durable body and internal components ensure long life and resistance to mineral buildup. Maintenance is simple, and adjustment is straightforward—even when the valve is installed in tight mechanical rooms.

Engineered for Performance

Whether it’s a new build or a retrofit, the Taco 329-T3 helps prevent system over-pressurization, protects components like expansion tanks and boilers, and maintains optimal flow. With its proven performance and contractor-friendly design, it's a trusted solution on job sites across the industry.

Specify with Confidence

Choose the Taco® 329-T3 for your next project and ensure consistent water pressure control with a valve that’s built to perform. Designed for professionals, built for reliability.