Conbraco 10-604-15 Relief Valve

The Conbraco 10-604-15 Relief Valve is a high-capacity safety solution engineered specifically for hot water heating boilers and hydronic systems. Built with a rugged ASTM B584 bronze body and spring cage, this ASME Section IV certified valve is designed to handle demanding commercial and industrial environments. It features 3/4" Female NPT inlet and outlet connections and is factory set at 75 PSI, providing a substantial 1,686,000 BTU capacity to protect against over-pressurization caused by control failure. The internal silicone seat and alloy steel plated spring are protected by a fabric-reinforced molded diaphragm, which isolates the spring chamber from the process media at all times. This diaphragm design, combined with an elevated seat for positive drainage, ensures the 10-600 Series remains a reliable choice for veteran contractors looking for high-capacity pressure relief in systems operating up to 250°F.

• ASME Section IV Certified: National Board capacity certified to meet strict safety codes for heating boilers.
• Enhanced Durability: Heavy-duty bronze construction and a corrosion-resistant plated spring ensure long-term service in harsh mechanical rooms.
• Diaphragm Isolation: The molded diaphragm keeps the spring dry, preventing mineral buildup and corrosion for consistent set-point accuracy.
• High BTU Discharge: Capable of exhausting 1,686,000 BTU/hr, making it suitable for large-scale hydronic heating plants.
• Reliable Sealing: Features a high-temperature silicone seat for bubble-tight shutoff after high-pressure events.

What is the maximum operating temperature for this relief valve?
This valve is rated for a maximum temperature service of 250°F (121°C).

Can this valve be used for steam service?
No, the 10-604-15 is specifically designed and ASME certified for hot water heating systems; for steam applications, an ASME Section I or VIII safety valve should be selected.

Is the outlet size larger than the inlet?
On this specific model (10-604-15), both the inlet and outlet are 3/4" Female NPT; however, expanded outlet versions are available in the 10-600 series if required by local piping codes.

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.