Watts 0121409 Valve

The Watts 0121409 (Model LF40L-2) is a high-capacity lead-free temperature and pressure relief valve engineered for heavy-duty commercial water heater applications. Designed as the direct lead-free replacement for the 0154830 and 40L-2-150, this valve provides critical automatic temperature and pressure protection for large-scale hot water supply tanks. It features a 1-inch MNPT inlet and FNPT outlet, boasting a substantial ASME rating of 2,134,000 BTU/hr. Built with a lead-free copper silicon alloy body and a 2-inch coated thermostat, it is specifically designed for commercial T&P valve installation directly into tank tappings. The Watts LF40L-2 150 psi set point ensures system integrity, while the 210°F temperature relief threshold prevents hazardous overheating. With automatic reseating capabilities, tamper-resistant bonnet screws, and an integrated test lever, this component meets the rigorous demands of veteran contractors looking for ASME-rated relief valves that comply with modern potable water regulations.

• Heavy-Duty Capacity: Rated at 2,134,000 BTU/hr, making it ideal for high-output commercial water heater protection.
• Lead-Free Compliance: Constructed from a lead-free copper silicon alloy to meet all potable water safety standards.
• Precise Thermal Response: Includes a 2-inch thermo-bonded coated thermostat that prevents mineral buildup for consistent 210°F relief.
• System Security: Equipped with tamper-resistant bonnet screws and a non-mechanical seat-to-disc alignment for reliable 150 psi pressure relief.
• Universal Replacement: Specifically serves as the updated version for discontinued models 0154830 and 40L-2-150.

What is the difference between the 0121409 and the older 0154830?
The 0121409 is the lead-free automatic reseating valve designed to replace the 0154830. While they share the same 1-inch 150# specifications and 2,134,000 BTU rating, the 0121409 meets current environmental regulations for potable water systems.

Does this valve include a flood sensor?
Yes, the modern Watts LF40L-2 series often comes equipped with a flood sensor designed to detect excessive discharge. Note that a separate activation kit is required to integrate this sensor with a building management system.

Can this be installed in any commercial boiler?
This valve is ASME Section IV rated and CSA listed. You must verify that the 2,134,000 BTU/hr rating exceeds the input BTU of your equipment to ensure proper safety sizing.

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.