Watts 0278030 Valve

The Watts 0278030, also identified as the Series 174A-2-30, is a heavy-duty ASME Section IV certified pressure relief valve designed for high-capacity protection of hot water heating and domestic supply boilers. This 2-inch NPT bronze boiler relief valve is factory-set at 30 PSI with a massive steam relief capacity of 3,815,000 BTU/hr. Built with a non-mechanical seat-to-disc alignment, the internal stainless steel spring and working parts are isolated from the discharge stream by high-temperature resistant seals to prevent sticking or freezing. The raised seat design ensures water and sediment cannot be trapped, preventing fouling and ensuring a clean seal even in harsh hydronic environments. This valve is engineered specifically for emergency safety relief and features an integrated SentryPlus Alert flood sensor (requires activation kit) to provide contractors with real-time monitoring of discharge events. If you are replacing a Watts 174A-2-30 or 278030, this unit provides the precise ASME rated discharge performance required for large-scale commercial boiler systems.

• High BTU Capacity: Rated for up to 3,815,000 BTU/hr at 30 PSI, making it suitable for high-output commercial boilers.
• Corrosion Resistant: Features a bronze body construction and stainless steel spring for long-term reliability in non-potable heating systems.
• Anti-Foul Seal: The seat is positioned above the drain to prevent sediment accumulation and potential valve failure.
• Direct Fit Replacement: Serves as the OEM 2-inch replacement for Watts 0278030 and 174A-2-30 configurations.
• Flood Detection: Includes a factory-installed flood sensor that can be integrated into a Building Management System (BMS).

• Is this valve adjustable? No. The Watts 0278030 is factory-set at 30 PSI and is not field-adjustable.
• What is the proper mounting orientation? While it can be mounted horizontally or vertically, the discharge line must be the same size as the 2-inch outlet and pitch downward for safe drainage.
• Can this be used for potable water? No. This is a non-lead-free bronze valve intended for closed-loop hydronic heating and non-potable boiler applications only.

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.