WATTS 9D-M3 BACKFLOW PREVENTER W ATMOSPHERIC VENT 175 PSI 250°F

Description:

The Watts 9D-M3 Backflow Preventer with Atmospheric Vent is a dual check valve backflow preventer designed to prevent backpressure and backsiphonage from contaminating potable water systems in continuous-pressure, non-health hazard applications. Commonly installed in boiler feed lines, laboratory equipment, sterilizers, processing tanks, dairy equipment, and commercial water supply systems requiring reliable backflow protection. Maintenance technicians, plumbing contractors, facility operators, and system integrators use this device for code compliance, replacement projects, preventive maintenance, and new installations requiring dependable cross-connection control.

Applications:

The Watts 9D-M3 Backflow Preventer is widely used in boiler feed water systems, commercial heating systems, laboratory facilities, sterilization equipment, dairy operations, food processing plants, manufacturing facilities, processing tanks, institutional buildings, schools, hospitals, mechanical rooms, and industrial process systems. The dual check design with intermediate atmospheric vent prevents polluted water from flowing back into potable water supplies during backpressure or backsiphonage events. It is commonly specified for smaller supply lines where continuous-pressure protection is required and is especially recommended for boiler feed applications where maintaining potable water safety and regulatory compliance is critical. The unit can be installed horizontally or vertically and includes an integral strainer to help protect internal components from debris.

Technical Specifications:

• Brand: Watts
• Model: 9D-M3
• Product Type: Dual Check Valve Backflow Preventer with Atmospheric Vent
• Series: 9D
• Backflow Preventer Type: Dual Check with Intermediate Atmospheric Vent
• Body Material: Forged Brass
• Internal Components: Stainless Steel
• Check Valve Material: Rubber
• Seat Material: Rubber
• Integral Strainer: Yes
• Protection Type: Backpressure and Backsiphonage Prevention
• Hazard Classification: Non-Health Hazard Applications
• Maximum Working Pressure: 175 PSI
• Maximum Operating Temperature: 250°F (121°C)
• Minimum Operating Temperature: 33°F (0.5°C)
• Minimum Working Pressure: 25 PSI
• Installation Orientation: Horizontal or Vertical
• Service Media: Hot and Cold Water
• Connection Type: Female NPT Union Connections
• Function: Potable Water Backflow Protection
• Application: Boiler Feed Lines and Process Equipment Protection

Common Replacements:

• Watts LF9D-M3 Lead-Free Dual Check Valve Backflow Preventer
• Watts 9D-M2 Dual Check Valve Backflow Preventer
• Zurn Wilkins 9D Series Dual Check Backflow Preventer