Watts LFN36M1-1/2" Vacuum Relief Valve

Watts LFN36M1-1/2 Vacuum Relief Valve is designed to protect your low-pressure steam and water systems by venting excess vacuum. Featuring a brass body with a 1/2 inch inlet and a male threaded end, this valve uses a Buna-N seal and a silicone disc, supported by a 302 stainless steel spring for dependable operation up to 250°F and 200 PSI SWP. It’s lead-free and built to meet ANSI Z21.22, CSA, and ISO 9001 standards, making it ideal for domestic water heaters, supply tanks, table-top heaters, unit heaters, steam coil heaters, and jacketed kettles. The compact, low-profile design minimizes placement space, while a protective cap, polypropylene cover, and a glass-filled polysulfone float ensure reliable performance even in demanding environments. With a venting capacity of 15 CFM, this Watts valve quickly manages vacuum conditions, protecting equipment and piping from damage.

• Low Profile Design
• Protective Cap
• Polypropylene Cover
• Glass-Filled Polysulfone Float
• 1/2" Inlet Size
• Male Threaded End Connection
• Brass Body
• 302 Stainless Steel Spring
• Buna-N Seal
• Silicone Disc
• Lead-Free
• Temperature Rating 250°F
• Pressure Rating 200 PSI SWP
• Venting Capacity 15 CFM
• Standards: ANSI Z21.22, CSA, ISO 9001
• Applications: Low-Pressure Steam & Water Service, Domestic Water Heater, Table-Top Heater, Unit Heater, Steam Coil Heater, Jacketed Steam Kettle