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Call: 888-611-7275

Backflow Preventers


Double Check Valve Assemblies

Double Checks may be installed under continuous pressure service and may be subject to back pressure. In a non -flow condition, the check valves hold a 1 PSI minimum in the direction of flow. In a flow condition, the check valves are open proportional to the flow demand. In a backflow condition, the check valves will close until the resumption of normal flow.

Dolor Sit Amet

  • Various models for different applications available
  • Completely pre-assembled for easy installation
  • Easy maintenance
  • Precast concrete vault or pad and insulated enclosure
  • Long-lasting and dependable service
  • Only certified equipment used for construction

Simply stated, a backflow preventer is a check valve device that’s installed on a potable piping system that allows water to flow in one direction, but never in the opposite direction. Its sole job is to prevent drinking water from being contaminated due to backflow. Backflow of water is caused by the pressure differential between the upstream (water main) and the downstream of the backflow device.

Water pressure can be affected when: 

  • There is a break in the water main.
  • Water is being pumped from the main water supply during a fire.
  • A customer is using water at a higher pressure than the pressure supplied.
  • The water outlet at the property is higher than the water main, causing constant back pressure.​
  • Heavy water use downstream reduces water pressure upstream.​

Additional Resources

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Above ground enclosed reduced pressure assembly


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Air relief valve


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Double check assembly, 3/4" through 2"


Double check assembly, 3" through 10"

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