Watts 0121513 Valve

The Watts 0121513 is a high-capacity LF174A-1 1/4-50 boiler pressure relief valve specifically engineered for hot water heating systems and domestic supply boilers. Built with a lead-free copper silicon alloy body, this valve is designed to protect against excessive pressure by providing a high-volume emergency discharge reaching 2,459,000 BTU/hr. It features 1-1/4 inch NPT threaded female inlet and outlet connections, housing a stainless steel spring and a non-metallic disc-to-metal seat that prevents sticking and freezing even in corrosive water conditions.

As a veteran's choice for commercial and residential ASME boiler relief valve replacements, it maintains a factory setpoint of 50 PSI. The design incorporates an elevated seat to prevent sediment accumulation and ensures that water cannot be trapped around the seal. This model is identical to the Watts 174A-1 1/4-50 but updated with lead-free materials to meet modern compliance standards. Note that this unit is intended for emergency safety relief and should not be utilized as an operating control.

• Corrosion Resistance: Lead-free copper silicon alloy body and stainless steel spring withstand harsh hydraulic environments.
• High BTU Displacement: ASME rated for 2,459,000 BTU/hr to handle significant thermal expansion in large-scale boiler systems.
• Anti-Foul Design: Position of the seat above the drain line prevents sediment from compromising the valve seal.
• Reliable Seating: Non-metallic disc-to-metal configuration ensures automatic reseating and prevents the valve from freezing shut.

Is the Watts 0121513 a direct replacement for the older 174A models?
Yes, it is the lead-free equivalent and maintains the same 1-1/4" NPT footprint and 50 PSI setpoint for seamless field replacement.

Can this valve be installed in any orientation?
Standard industry practice and manufacturer guidelines require safety relief valves to be installed in a vertical position with the test lever at the top to ensure proper drainage and operation.

What size discharge line is required for this valve?
The discharge piping must be at least the same size as the 1-1/4" valve outlet and must pitch downward to a safe point of disposal to prevent water from being trapped against the seat.

This item is not eligible for free shipping.

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.