Watts M150036N Temperature and Pressure Relief Valve

The Watts M150036N 3/4 in. 40L Temperature and Pressure Relief Valve provides automatic overpressure and overtemperature protection for commercial hot water heaters, storage tanks, boilers, and related systems by discharging water when preset limits are exceeded. Built with a bronze body and an automatic reseating mechanism, it includes a test lever for periodic inspection and maintenance. The valve features a 3/4 in. inlet with a male NPT connection and a 3/4 in. outlet with a female NPT connection, and it uses an extended thermostat probe to sense temperature. Key specifications include a pressure relief setting of 150 PSI, a temperature relief setting of 210°F (99°C), and a maximum working pressure of 150 PSI, with service media of hot water and installation suitable for commercial hot water protection systems. Compliance notes indicate ASME-rated and CSA-listed (series dependent), and the 40L series is commonly applied to commercial water heaters, hot water storage tanks, boilers, hydronic heating systems, and industrial hot water equipment requiring reliable safety relief.