Conbraco 18C-512-5-150 Valve

The Conbraco 18C-512-5-150 is a heavy-duty, commercial-grade temperature and pressure relief valve designed for high-capacity protection of hot water storage tanks and water heaters. Engineered with a bronze body (ASTM B584) and a silicone seat, this valve ensures reliable performance in demanding hydronic systems. This specific model features a 3/4" Female NPT inlet and a 3/4" Female NPT outlet, factory-set at 150 PSI and 210°F. With an ASME Section IV certified capacity of 1,912,000 BTU/HR, it is optimized for high-demand industrial and commercial applications.

The 5" probe length (element length) is nylon-coated to resist corrosion and mineral build-up, ensuring the Apollo 18C-500 series maintains accurate thermal response over time. Professionals choose this ASME T&P valve for its CSA listing and compliance with ANSI Z21.22 standards. Whether you are performing a new installation or replacing a failed safety valve, the 18C-512-5-150 provides the necessary discharge capacity to protect pressurized vessels from catastrophic over-pressure or over-temperature conditions. Its robust internal components, including a stainless steel spring, offer the durability required by veteran pipefitters and boiler technicians.

• High BTU Rating: Delivers a massive 1,912,000 BTU/HR steam discharge capacity, meeting ASME Section IV requirements for large-scale commercial heaters.
• Corrosion Resistance: Features a nylon-coated element and bronze construction to prevent scale accumulation and extend service life in hard water conditions.
• Industry Compliance: Fully CSA listed and certified to ANSI Z21.22, ensuring your installation meets local building codes and safety regulations.
• Precision Thermal Sensing: The 5-inch probe ensures accurate water temperature monitoring deep within the tank for rapid response to thermal expansion.

What is the difference between the 18C-512 and other 3/4" relief valves?
The 18C-512-5-150 is a high-capacity commercial valve. Unlike standard residential T&P valves which may have a lower BTU rating, this series is engineered for much larger commercial storage tanks where high-volume discharge is mandatory for safety code compliance.

Can the 150 PSI set point be adjusted in the field?
No. These valves are factory-set and sealed to maintain their ASME certification. Any attempt to field-adjust the pressure or temperature settings will void the safety certifications and potentially lead to equipment failure.

Is this valve suitable for steam heating boilers?
While this valve has an ASME steam capacity rating, it is primarily designed as a Temperature and Pressure Relief Valve for hot water supply systems. Always verify with your local inspector that a T&P valve, rather than a dedicated steam safety valve, is appropriate for your specific pressure vessel.

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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.