Watts M150036N Temperature and Pressure Relief Valve

Description:

The Watts M150036N 3/4" 40L is a temperature and pressure (T&P) relief valve designed to provide automatic overpressure and overtemperature protection for commercial hot water heaters, storage tanks, and hot water supply systems. It automatically discharges water when preset pressure or temperature limits are exceeded, helping protect equipment from unsafe operating conditions. The valve features a durable bronze body, automatic reseating mechanism, and test lever for periodic inspection and maintenance.

Applications:

The Watts 40L series relief valve is commonly installed on commercial water heaters, hot water storage tanks, boilers, hydronic heating systems, and industrial water heating equipment. It provides continuous safety protection by relieving excessive pressure or temperature buildup, helping prevent damage to tanks, piping, and associated plumbing components. It is suitable for commercial, institutional, and industrial hot water applications requiring ASME-rated temperature and pressure relief protection.

Technical Specifications:

• Manufacturer Part Number (MPN): M150036N
• Brand: Watts
• Series: 40L
• Product Type: Temperature and Pressure Relief Valve
• Valve Size: 3/4 in.
• Connection Type: Male NPT Inlet × Female NPT Outlet
• Body Material: Bronze
• Function: Automatic Temperature and Pressure Relief
• Pressure Relief Setting: 150 PSI
• Temperature Relief Setting: 210°F (99°C)
• Maximum Working Pressure: 150 PSI
• Thermostat Type: Extended Thermostat Probe
• Actuation: Automatic Reseating with Test Lever
• Service Media: Hot Water
• Installation: Water Heaters and Storage Tanks
• Application: Commercial Hot Water Protection Systems
• Compliance: ASME Rated and CSA Listed (series dependent)

Common Replacements:

• Watts 40L-150210 
• Watts 40XL-8-150210 
• Watts LF40XL8-085210