Watts 0276886 Valve

The Watts 0276886 is a professional-grade Series 174A hot water boiler pressure relief valve designed for high-capacity protection in heavy-duty commercial heating systems. This specific 1.5-inch NPT model is factory-set to 50 PSI and delivers a high-volume steam discharge capacity of 2,950,000 BTU/hr. Engineered with a non-metallic disc-to-metal seat, it prevents the seat from sticking, ensuring reliable operation even in systems with high mineral content. The bronze body construction provides superior corrosion resistance, while the large expansion chamber handles thermal expansion and overpressure conditions without premature seat failure. This ASME Section IV certified safety valve is essential for preventing catastrophic pressure buildup in large-scale hydronic boilers. When replacing a Watts 174A relief valve, verify the system's maximum heat output does not exceed the valve's BTU rating to maintain safe operation and code compliance on the job site.

Key Benefits

• Maximum Discharge Capacity: Rated for up to 2,950,000 BTU/hr to protect high-output commercial boilers.
• Durable Construction: Heavy-duty bronze body and stainless steel springs resist corrosion and chemical degradation.
• Reliable Reseat: Features a silicone disc for heat resistance and positive shutoff after pressure release.
• Code Compliance: Designed and certified in accordance with ASME Section IV requirements for pressure relief.
• Field Proven: The 1.5-inch inlet/outlet configuration allows for standard pipe integration in most mechanical rooms.

Common Questions

What causes a Watts 174A valve to drip or leak?
Continuous dripping is usually caused by sediment or scale buildup between the seat and the disc, or a waterlogged expansion tank causing system pressure to exceed the 50 PSI set point.

Can this relief valve be mounted horizontally?
No, for proper operation and to satisfy most local codes, the Watts 0276886 must be installed in a vertical position with the discharge piping sloped for gravity drainage.

Is this the correct replacement for a residential boiler?
While compatible with NPT fittings, a 2,950,000 BTU rating is typically overkill for residential units; ensure your boiler's specifications require a 50 PSI set point and 1.5-inch connections before installation.

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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.