How A Backflow Prevention Device Works. When the pressure on the inlet side of your prevention device exceeds 2psi, water flows through the sensing line and fills the upper chamber of the system’s diaphragm. This pressure depresses the spring that closes the release valve.

How does a backflow preventer work?

How A Backflow Prevention Device Works. When the pressure on the inlet side of your prevention device exceeds 2psi, water flows through the sensing line and fills the upper chamber of the system’s diaphragm. This pressure depresses the spring that closes the release valve.

Why is my Watts backflow preventer leaking?

There is no one reason for backflow preventer leaks. For instance, it may freeze during the winter and be damaged when it’s turned on afterwards. Another cause for leaking might be damage to certain parts, which can happen no matter how old the device is. … For one, you can try the backflow preventer repair kit.