Watts 0274836 Valve

The Watts 0274836 (Model 174A-3/4-150) is a high-capacity boiler pressure relief valve engineered for critical overpressure protection in hot water heating systems and domestic supply boilers. Rated for an impressive 2,445,000 BTU/hr, this 3/4-inch valve features a rugged bronze body construction and NPT female threaded connections designed to withstand demanding mechanical room environments. Its non-mechanical seat-to-disc alignment is specifically developed to prevent sticking or freezing, ensuring reliable activation at the 150 PSI set point. Unlike standard residential valves, the Series 174A positions the seat above the drain, a design feature that prevents sediment buildup and water trapping that could otherwise foul the seat and cause premature failure or leakage. A stainless steel spring and integrated test lever provide the durability and manual testing capabilities required by veteran contractors for system commissioning and routine maintenance.

• Maximum Discharge Capacity: Rated at 2,445,000 BTU/hr to provide safety coverage for high-output boiler systems.
• Corrosion Resistance: Heavy-duty bronze body resists aggressive water conditions and ensures long-term structural integrity.
• Sediment Protection: The unique "seat above drain" design ensures that sediment cannot foul the seat, reducing nuisance calls and maintenance intervals.
• Resilient Sealing: Equipped with a non-metallic disc-to-metal seating for positive shut-off and resistance to heat-related degradation up to 250°F.
• Standardized Fit: Features dual 3/4-inch FNPT connections for straightforward integration into existing hydronic piping.

• Is this valve suitable for potable water? No, the Watts 0274836 is not lead-free and is strictly intended for non-potable hot water heating and space-heating applications. For potable systems, the LF174A series must be used.
• Can this be used as an operating control? No. This is an emergency safety relief valve only. It is designed to protect equipment from excessive pressure and is not intended for regular cycling or pressure regulation.
• What is the temperature limit for this model? This valve is rated for a maximum operating temperature of 250°F (121°C), making it compatible with high-temperature hydronic systems.

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.