Conbraco 18C-551-3-150 Valve

The Conbraco 18C-551-3-150 is a high-capacity commercial T&P relief valve designed for the rigorous protection of large-scale hot water heaters and storage tanks. Featuring a robust ASTM B584 bronze body, this valve is engineered to manage extreme thermal and pressure loads in demanding mechanical rooms. It features a 2" Male NPT inlet and a 1-1/2" Female NPT outlet, specifically calibrated for a 150 PSI set pressure and a maximum temperature threshold of 210°F. With an ASME Section IV certified capacity of 6,050,000 BTU/HR, this unit provides critical safety overhead for high-output boiler systems.

Built for long-term field reliability, the 18C-551-3-150 Valve includes a 3-inch probe length with a nylon-coated element to resist mineral buildup and corrosion. The internal stainless steel spring and silicone seat disc ensure positive shut-off and repeatable performance after activation. This Apollo temperature and pressure relief valve is CSA listed to ANSI Z21.22, making it a standard specification for contractors maintaining commercial potable water systems and industrial heating equipment.

• High BTU Rating: Provides 6,050,000 BTU capacity, suitable for high-volume commercial water heating applications.
• Corrosion Resistance: Features a coated thermal element and stainless steel internal components to prevent scale-induced failures.
• Heavy-Duty Construction: The bronze relief valve body ensures durability under high-pressure conditions in mechanical environments.
• Certified Safety: Meets ASME Section IV and CSA standards for reliable over-temperature and over-pressure protection.

Is the 18C-551-3-150 compatible with both steam and water?
This T&P valve is specifically designed for commercial hot water heaters and storage tanks. It provides automatic reseating for temperature and pressure protection in potable water systems.

What is the purpose of the 3-inch probe length?
The 3-inch element length ensures the temperature-sensing bulb reaches deep into the tank water, accurately monitoring the thermal state as required by ASME safety codes.

Can this valve be installed horizontally?
Yes, however, technical standards suggest following the manufacturer's orientation guide to ensure the discharge line remains free-draining and the relief valve functions correctly without sediment accumulation.

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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.