Watts 0274934 Valve

The Watts 0274934, also identified as the Watts 174A-1-30, is a high-capacity 1-inch ASME pressure relief valve designed specifically for hot water heating systems and domestic supply boilers. Engineered with a heavy-duty bronze body and a stainless steel spring, this valve provides critical overpressure protection for equipment rated up to 1,005,000 BTU/hr. The 174A series is the industry standard for contractors requiring a 30 PSI relief setting with non-mechanical seat-to-disc alignment that eliminates the risk of sticking or freezing in harsh hydronic environments.

This boiler pressure relief valve features an angle pattern with 1" NPT female inlet and outlet connections. The design includes a raised seat positioned above the drain to prevent sediment accumulation and fouling, ensuring a positive seal after discharge. For high-demand HVACR applications, the Watts 174A 1" 30 PSI valve delivers reliable thermal expansion protection and is essential for maintaining the safety integrity of commercial boiler systems. Its 250°F maximum temperature rating makes it compatible with a wide range of fired hot water pressure vessels.

• High BTU Capacity: Rated for systems up to 1,005,000 BTU/hr to handle large-scale hydronic loads.
• Corrosion Resistance: Durable bronze construction and stainless steel internals resist aggressive water conditions.
• Anti-Foul Design: Raised seat architecture prevents sediment entrapment and ensures consistent reseating.
• ASME Certified: Meets strict safety standards for emergency pressure relief in hot water supply applications.

• Is the 30 PSI setting adjustable? No, the Watts 0274934 is a fixed-setting relief valve and cannot be adjusted in the field.
• Can this be used for potable water? This specific model is intended for non-potable hot water heating and boiler applications.
• What size discharge pipe is required? The discharge line must be the same 1-inch size as the valve outlet and pitched downward for proper drainage.

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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.