Conbraco Industries 18C-531-4-125 Valve

The Apollo Conbraco 18C-531-4-125 is a high-capacity temperature and pressure relief valve engineered for heavy-duty commercial water heating systems. Featuring a 1 1/4" MNPT inlet and a 1" FNPT outlet, this T&P relief valve is factory set at 125 PSI and 210°F. With an impressive steam discharge capacity of 3,070,000 BTU/hr, it provides essential over-pressure and thermal protection for large-scale boilers and storage tanks. The 4-inch probe length ensures accurate immersion in the water heater’s top six inches, where the hottest water resides, preventing dangerous "runaway" heating conditions. Built with a bronze body and stainless steel springs, this 18C series valve is designed for ASME Section IV compliance. Contractors choose this Apollo 18C-531-4 for its reliability in HVAC mechanical rooms where high-volume BTUs require robust, code-compliant safety components to prevent equipment failure and ensure long-term system integrity.

Technical Performance Benefits

• High BTU Rating: Rated for up to 3,070,000 BTU/hr, making it suitable for high-output commercial water heaters.
• Corrosion Resistance: Engineered with a premium bronze body and silicone seat to resist mineral buildup and thermal degradation.
• Precise Calibration: Factory-set and sealed at 125 PSI and 210 degrees Fahrenheit to meet strict safety regulations.
• Extended Probe: The 4-inch thermal element delivers responsive temperature sensing for rapid relief during thermal expansion cycles.

Common Questions

What is the orientation for installing this valve?
The 18C series must be installed so that the temperature-sensing element is immersed in the water within the top 6 inches of the tank. It can be installed vertically or horizontally, but the discharge line must always pitch downward to allow for complete drainage.

Is this valve compatible with ASME Section IV requirements?
Yes, this Conbraco 18C-531-4 is designed, manufactured, and certified in accordance with ASME Boiler and Pressure Vessel Code Section IV, ensuring it meets institutional safety standards for commercial potable water heating.

Can I use this on a steam heating boiler?
No, this is a temperature and pressure relief valve specifically designed for hot water supply systems. Steam heating boilers require specialized safety valves that do not utilize a temperature probe.

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.