Conbraco Industries 10-408-05 Valve

The Conbraco Industries 10-408-05 is a high-capacity ASME Section IV hot water relief valve designed for commercial and industrial boiler applications. Featuring a 3/4 inch FNPT inlet and outlet, this brass safety valve is factory-set at 30 PSI to prevent over-pressurization in hydronic heating systems. With a certified discharge capacity of 535,000 BTU/hr, it provides reliable thermal expansion protection for mid-sized boiler plants and high-output water heaters. The bronze body construction and corrosion-resistant stainless steel springs ensure mechanical integrity under a maximum temperature service of 250°F. Engineers and contractors specify the 10-400 series for its high-flow characteristics and strict compliance with National Board capacity certifications. This boiler pressure relief valve utilizes a silicone seat to prevent leakage and "simmering" near set pressure, maintaining the operational efficiency of the closed-loop system while protecting downstream components from catastrophic failure due to excessive pressure spikes.

• ASME Section IV Certified: Ensures compliance with local building codes and safety standards for hot water heating boilers.
• High-Flow Capacity: Rated for 535,000 BTU/hr, making it suitable for high-demand commercial hydronic applications.
• Durable Brass Construction: Resists dezincification and provides long-term reliability in harsh mechanical room environments.
• Standard NPT Connections: Features 3/4" FNPT threads on both the inlet and discharge ports for straightforward installation and piping.
• Silicone Seat: Specifically engineered to prevent sticking and ensure a tight seal after several lift cycles.

Is the Conbraco 10-408-05 suitable for steam applications?
No, this specific model is designed and rated for hot water heating service only. For steam systems, an ASME Section I or Section VIII valve must be selected based on the specific pressure and capacity requirements of the boiler.

Can I install this relief valve in a horizontal orientation?
ASME code and manufacturer guidelines require relief valves to be installed in a vertical position with the drain piping sloped for gravity drainage to prevent sediment buildup and ensure proper mechanical operation.

What is the difference between a relief valve and a safety valve in this context?
In HVACR applications, this relief valve is designed to open gradually as pressure increases above the 30 PSI set point, whereas a safety valve is typically a "pop-action" device used for compressible fluids like steam or air.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.