Watts Water Technologies M335M2-030 Pressure Relief Valve

Description:

The Watts M335M2-030 Pressure Relief Valve is a 3/4 inch boiler safety relief valve designed to provide automatic overpressure protection in low-pressure hot water and steam heating systems with a factory-set relief pressure of 30 PSI. Commonly installed in commercial and industrial boilers, hydronic heating systems, steam heating equipment, process heating systems, and mechanical room installations requiring ASME-compliant pressure relief protection. Maintenance technicians, boiler contractors, facility engineers, and system integrators use this valve for safety compliance, replacement projects, preventive maintenance, and new boiler installations requiring dependable overpressure protection.

Applications:

The Watts M335M2-030 Pressure Relief Valve is widely used in commercial boiler plants, industrial steam heating systems, hydronic heating networks, manufacturing facilities, schools, hospitals, universities, apartment complexes, hotels, government buildings, process heating equipment, heat exchanger systems, district heating installations, and mechanical equipment rooms. The valve automatically opens when system pressure exceeds the 30 PSI set point, helping protect boilers, piping, pumps, expansion tanks, and associated heating equipment from potentially damaging overpressure conditions. It is commonly specified in low-pressure steam and hot water heating applications where reliable safety protection is required to maintain system integrity, comply with safety regulations, and safeguard personnel and equipment.

Technical Specifications:

• Manufacturer Part Number (MPN): M335M2-030
• Ordering Code: 0342692
• Brand: Watts
• Product Type: Boiler Pressure Relief Valve
• Series: 335
• Valve Size: 3/4 in.
• Inlet Connection: 3/4 in. Male NPT
• Outlet Connection: 3/4 in. Female NPT
• Pressure Relief Setting: 30 PSI
• Pressure Rating: ASME Section IV
• Body Material: Bronze
• Spring Material: Stainless Steel
• Seat Design: Non-Stick Teflon Disc-to-Metal Seating
• Maximum Operating Temperature: 250°F
• Steam Discharge Capacity: 510,000 BTU/hr
• Protection Type: Pressure Relief Only
• Stem Design: Top-Guided Stem
• Feature: High Heat Resistant Silicone Disc
• Application: Low Pressure Steam and Hot Water Boilers
• Service Environment: Commercial and Industrial Heating Systems
• Function: Automatic Overpressure Protection

Common Replacements:

• Watts 335M2-030 3/4" Female Pressure Relief Valve
• Watts 374A 3/4" Boiler Pressure Relief Valve
• Watts M375M2-030 3/4" Pressure Relief Valve