Watts 0121457 Valve

The Watts 0121457 (Model LF140X-6-150) is a heavy-duty lead free temperature and pressure relief valve designed specifically for 1-inch commercial hot water supply tanks and heaters. Engineered with a lead free copper silicon alloy body, this automatic reseating valve provides critical protection by discharging water when system parameters exceed 150 psi or 210°F. This model features a 6-inch stainless steel thermostat probe, making it ideal for installation in hot water outlets where a standard short thermostat cannot reach the highest temperature zone of the tank. With a massive ASME pressure steam discharge capacity of 3,085,000 BTU/hr, the LF140X-6-150 ensures reliable performance in high-demand mechanical rooms. The valve utilizes a non-mechanical seat-to-disc alignment and includes tamper-resistant bonnet screws to maintain set specifications in the field. This unit is a direct replacement for 140X-6-150 and LF140X6-150-1 configurations, offering seamless integration into existing 1" FNPT piping systems.

Key Benefits

• High-Capacity Thermal Protection: Rated for up to 3,085,000 BTU/hr to support large-scale commercial water heating equipment.
• Extended Probe Design: Features a 6-inch extension thermostat for accurate temperature sensing within the hot water outlet flow.
• Code Commpliance: Lead-free construction meets stringent ANSI Z21.22 and CSA requirements for potable water safety.
• Durable Construction: Built with a corrosion-resistant bronze body and stainless steel internal components for long-term service in harsh water conditions.
• Simplified Testing: Equipped with a standard test lever for routine HVACR maintenance and safety inspections.

Common Questions

What is the difference between the 140S and 140X series?
The 140S features a short thermostat for direct tank tapping installation, while the 140X utilizes an extended thermostat (6 inches in this model) for installation in the hot water outlet piping.

Does this valve require manual resetting after a discharge?
No, this is an automatic reseating relief valve; it will close itself once the temperature or pressure returns to safe operating levels.

Is the 0121457 compatible with flood sensors?
This specific model is the standard mechanical version; however, 140X series valves are often compatible with SentryPlus Alert technology when used with a retrofit sensor 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.