Conbraco 18C-521-3-150 Valve

The Conbraco 18C-521-3-150 is a high-capacity ASME Section IV certified temperature and pressure relief valve designed specifically for commercial hot water heaters and storage tanks. Built with a rugged ASTM B584 bronze body and brass trim, this Apollo TPC series valve provides critical safety overpressure protection. It features a 1" Male NPT inlet and a 1" Female NPT outlet, factory-set to 150 PSI and 210°F. With a massive 2,155,000 BTU steam stripping capacity, this unit is engineered to manage high-output thermal expansion and pressure spikes in industrial hydronic systems. The 3-inch probe is protected by a corrosion-resistant nylon coating, ensuring long-term thermal element sensitivity and reliability in aggressive water conditions. For contractors, this ANSI Z21.22 and CSA certified valve is the standard for maintaining code compliance in large-scale potable water heating applications where high discharge rates are non-negotiable.

Key Benefits

• ASME Section IV Certified: Meets strict safety standards for high-capacity commercial and industrial water heating equipment.
• Corrosion-Resistant Probe: Features a 3-inch element with a specialized nylon coating to prevent mineral buildup and extend performance life.
• High BTU Rating: Rated for 2,155,000 BTU/hr, making it suitable for larger storage tanks and high-recovery commercial heaters.
• Durable Bronze Construction: Built with an ASTM B584 bronze body and silicone seat disc for reliable sealing and thermal resistance.
• Code Compliance: CSA listed and certified to ANSI Z21.22 requirements for temperature and pressure relief valves.

Common Questions

What is the discharge capacity of the Conbraco 18C-521-3-150?
This valve is rated for a 2,155,000 BTU/hr steam stripping capacity at its 150 PSI set point, ensuring it can handle high-output commercial water heaters.

Can this valve be used for steam heating boilers?
No, the 18C series is specifically designed for hot water supply systems and storage tanks. Always verify your specific vessel requirements against ASME Section IV and Section VIII standards.

How do I ensure the probe is the correct length?
This model includes a 3-inch probe. You must ensure the element resides in the top 6 inches of the tank where the water is hottest to ensure accurate thermal relief at 210°F.

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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.