Conbraco 10-618-20 Valve

The Conbraco 10-618-20 Valve is a high-capacity boiler pressure relief valve engineered specifically for ASME Section IV hot water heating systems. Featuring a rugged ASTM B584 bronze body and silicone seat, this valve is factory set at 100 PSI to provide critical overpressure protection for large-scale hydronic boilers. With a massive 15,924,000 BTU capacity, it utilizes an oversized 2-1/2" Female NPT outlet to handle high-volume discharge during emergency events, while the 2" Female NPT inlet ensures a secure connection to the pressure vessel. The internal alloy steel spring is isolated from the water flow via a reinforced diaphragm, preventing corrosion and mineral buildup. This Apollo 10-600 series valve is designed with an elevated seat to facilitate proper drainage, ensuring the system remains operational and compliant with the National Board capacity certification. For veteran contractors managing heavy commercial thermal loads, this hot water relief valve offers the heavy-duty performance required for long-term system stability.

• Extreme BTU Capacity: Rated for 15,924,000 BTU/hr to support large industrial and commercial hot water boilers.
• Corrosion-Resistant Construction: Built with a heavy-duty bronze body and alloy steel plated spring for harsh mechanical environments.
• ASME Section IV Certified: Fully compliant with safety standards for hot water heating boilers and hydronic systems.
• Oversized Discharge Port: The 2-1/2" FNPT outlet prevents backpressure issues during full-flow relief cycles.
• Diaphragm-Isolated Spring: Protects internal components from water contact, extending the service life of the pressure relief valve.

What is the maximum operating temperature for the Apollo 10-618-20?
This valve is rated for a maximum service temperature of 250°F (121°C), making it suitable for high-temperature hydronic heating applications.

Can this relief valve be mounted horizontally?
No. To ensure the elevated seat drains correctly and to comply with ASME code, the valve must be installed in a vertical, upright position directly to the boiler tapping.

Why does the outlet size differ from the inlet size?
The expanded outlet (2-1/2" vs 2" inlet) is a specific design feature to reduce discharge velocity and prevent pressure drop at the valve outlet, ensuring the 15.9M BTU capacity is maintained during relief.

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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.