Watts N36-M115CFM Vacuum Relief Valve 1/2 in NPT

Description:

The Watts N36-M115CFM Vacuum Relief Valve is a 1/2 inch NPT vacuum relief valve designed to automatically admit air into piping systems or vessels when internal pressure falls below atmospheric pressure, preventing vacuum formation and protecting equipment from collapse or siphonage. Commonly installed in water heaters, storage tanks, hydronic systems, process piping, and industrial fluid handling applications, it helps maintain system integrity and ensures safe operation during draining or pressure fluctuations. This particular unit is noted as missing the protective cover.

Applications:

The Watts N36-M115CFM Vacuum Relief Valve is widely used in commercial water heating systems, hot water storage tanks, industrial process vessels, hydronic heating systems, plumbing installations, and fluid distribution networks. By automatically opening under vacuum conditions, it allows air to enter the system and prevents negative pressure from damaging tanks, piping, and associated equipment. It is commonly specified in applications where vacuum protection, anti-siphon performance, and equipment safety are critical.

Technical Specifications:

• Manufacturer Part Number (MPN): N36-M115CFM
• Brand: Watts
• Product Type: Vacuum Relief Valve
• Valve Size: 1/2 in.
• Connection Type: Male NPT
• Function: Automatic Vacuum Relief / Air Admission
• Service Media: Water and Compatible Non-Corrosive Fluids
• Body Material: Brass
• Installation: Vertical Orientation Recommended
• Operating Principle: Spring-Loaded Vacuum Relief
• Application: Water Heaters, Storage Tanks, and Piping Systems
• Purpose: Prevent Vacuum Formation and Equipment Damage
• Protection: Anti-Siphon and Vacuum Break Capability
• Maintenance: Field Serviceable
• Condition Note: Protective Cover Missing (as specified)

Common Replacements:

• Watts N36 Vacuum Relief Valve
• Watts FV-4M1 Automatic Float Vent
• Watts N36-M1 Vacuum Relief Valve