Watts 0163754 Valve

The Watts 0163754, also identified as the 40XL-7-100, is a heavy-duty, automatic reseating temperature and pressure relief valve engineered for high-capacity commercial water heating systems. Designed for precise protection, this 1-inch NPT valve manages thermal expansion and over-pressure conditions with a 1,481,000 BTU/hr steam discharge capacity. It features a durable bronze body and a 7-inch thermo-bonded coated extension thermostat to ensure accurate sensing of water temperature at the most critical points in the tank. With a factory-set pressure relief of 100 psi and a standard temperature relief of 210°F, this ASME rated and CSA listed component is a direct replacement for existing Watts 40XL series installations, providing a non-mechanical seat-to-disc alignment that minimizes the risk of sticking or leakage after activation.

• High-Capacity Thermal Protection: Rated at 1,481,000 BTU/hr to handle large-scale commercial boiler and water heater demands.
• Extended Sensing Element: The 7-inch coated thermostat ensures the valve reacts to actual tank temperatures, preventing localized overheating.
• Corrosion Resistance: Built with a rugged bronze body and stainless steel internal parts to withstand harsh water conditions.
• Reliable Reseating: The automatic reseating design and tamper-resistant bonnet screws maintain system integrity after a relief event.
• Standardized Fit: 1-inch MNPT inlet and FNPT outlet connections allow for straightforward integration into standard commercial manifolds.

Is the Watts 0163754 compatible with the 40XL-7-100?
Yes, these part numbers are identical. The 0163754 is the specific ordering code for the 1-inch 40XL-7 model set at 100 psi with a 7-inch probe.

What is the difference between the 40L and 40XL series?
The Watts 40XL features an extension thermostat, whereas the 40L typically has a shorter sensing element. The XL version is preferred when the valve is installed in the hot water outlet piping rather than directly into a tank tapping.

Does this valve come with a flood sensor?
While newer 40XL-7-FS models include a flood sensor, the standard 0163754 is the traditional bronze valve. Always verify if your application requires the SentryPlus Alert technology version.

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.