Watts 0121524 Valve

The Watts 0121524 is a specialized 1.25 inch LF174A lead free relief valve engineered for critical pressure protection in hot water heating and domestic supply boiler applications. This veteran-grade component features a robust lead free copper silicon alloy body and is factory-set to a 125 PSI relief pressure, delivering a substantial steam discharge capacity of 5,370,000 BTU/hr. Designed with a non-mechanical seat-to-disc alignment, it effectively prevents sticking and freezing due to sediment buildup or corrosive water conditions. The FNPT threaded female inlet and outlet connections ensure a secure, leak-proof integration into high-capacity boiler systems. As a direct replacement for the 174A-1 1/4-125 and LF174A-1 1/4-125, this valve utilizes a stainless steel spring and a non-metallic disc-to-metal seat to maintain a reliable seal under rigorous thermal expansion cycles. It is strictly an emergency safety device, certified under ASME Section IV, and is not for use as an operating control.

• High BTU Capacity: Rated for up to 5,370,000 BTU/hr to handle immense thermal loads in commercial and large-scale residential boilers.
• Lead Free Construction: Complies with plumbing requirements for potable and domestic hot water supply systems using a copper silicon alloy.
• Anti-Foul Design: Raised seat located above the drain area prevents sediment from trapping and fouling the seat.
• Resilient Seating: Non-metallic disc-to-metal seating resists corrosive mineral deposits and ensures automatic reseating after discharge.

• What is the difference between the 174A and LF174A? The LF174A is the lead-free version of the standard 174A, designed specifically to meet low-lead regulations for domestic hot water systems.
• Is this valve compatible with steam boilers? No, while it can discharge steam in an emergency runaway condition, it is technically an ASME Section IV valve for hot water heating boilers only.
• Does this include a flood sensor? This specific model (0121524) is the relief valve; while it is compatible with SentryPlus Alert technology, active monitoring requires a separate sensor and activation kit.

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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.