Watts 0274683 Valve

For high-output heating systems requiring robust overpressure protection, the Watts 0274683 (Series 174A-100) is a critical component for both residential and commercial hot water supply boilers. This 3/4-inch pressure relief valve is engineered with a durable bronze body and features an ASME Section XIII certification, ensuring it meets rigorous safety standards for emergency relief. With a factory set point of 100 PSI and a high steam discharge capacity of 1,695,000 BTU/hr, it is designed to prevent catastrophic vessel failure by exhausting pressure faster than the boiler can generate thermal energy. The internal design utilizes a non-mechanical seat-to-disc alignment to prevent sticking or freezing, while the raised non-metallic disc-to-metal seating is positioned above the FNPT drain connection to ensure sediment does not foul the seal. This hot water boiler safety valve is specifically for non-potable heating applications and includes a stainless steel spring and a manual test lever for routine system inspections.

• Extreme Thermal Capacity: Rated for 1,695,000 BTU/hr to handle high-demand commercial heating loads.
• Fail-Safe Design: The non-mechanical alignment mechanism ensures the valve operates reliably even after long periods of inactivity.
• Corrosion Resistance: High-quality bronze construction and stainless steel springs provide longevity in harsh hydronic environments.
• Maintenance Optimized: A seat located above the 3/4" female threaded drain prevents water entrapment and debris buildup.
• Precision Safety: Maintains a 100 PSI setting specifically for high-pressure boiler configurations.

Is this valve suitable for use in potable water systems?
No, the Watts 174A does not meet low-lead requirements for drinking water. It is strictly for non-potable hot water heating and domestic supply boiler applications.

What size discharge pipe should be used with the 0274683?
The discharge line must match the 3/4" outlet size of the valve and should be piped to a safe point of disposal to prevent property damage during a relief event.

Can this be used as an operating control for my boiler?
No, this is an emergency safety relief valve only. It should never be used as a primary pressure regulator or operating control.

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.