What are the different types of backflow preventers?

Backflow preventers generally come in two different types: backflow prevention devices and backflow prevention assemblies.

  • Backflow Prevention Devices.
  • Atmospheric Vacuum Breakers.
  • Backflow Prevention Assemblies.
  • Pressure Vacuum Breakers.
  • Spill-Resistant Vacuum Breakers.
  • Double Check Valves.

Why are there 2 valves on a backflow preventer?

These backflow preventers are specifically designed to prevent reverse flow in fire sprinkler systems, using two check valves assembled in a series to prevent water from backing up into the supply line. This redundancy ensures that one check valve will continue to protect the city water supply even if the other fails.

Can a bad backflow cause low water pressure?

Backflow Preventer Valve Malfunction The most common cause of low water pressure in sprinklers is the backflow preventer valves not opening fully. There are two main pipes in your backflow preventer – one horizontal and one vertical.

Can backflow preventers be repaired?

Most components of backflow preventers are field-repairable. This means the individual component (check valve, relief valve, air inlet) can be rebuilt by replacing the rubber goods. In some older assemblies, repair parts may no longer be available and the backflow prevention assembly may have to be replaced.

What is a backflow preventer and how does it work?

A backflow preventer is a device that’s installed on your home’s water pipes 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.

What is backflow device?

A backflow device is a preventive device that is installed in pipelines carrying potable water to protect the water from harmful chemicals and contaminants. A clogged sewer pipe or an industrial effluent pipe can flow back into the main system and thus contaminate other supply sources.

What is a backflow valve?

Backflow Valve. A backflow valve is a prime example of a backflow preventer, the purpose of which is to prevent contaminated water from flowing back into a clean water supply. The backflow assembly is generally installed at exit points in a basement or a sewer pipe.