This is what your Pressure Vacuum Breaker should look like with normal flow, sprinklers can operate.

This is what your Pressure Vacuum Breaker should look like with normal flow, sprinklers can operate.

By | Published November 3, 2013 | Full size is 717 × 960 pixels

This is what your Pressure Vacuum Breaker will look like in Normal Operating Configuration. Full flow with sprinklers operating normally.
If your sprinklers are not working on all of your zones, and your Backflow device does not look like this, you just found your first problem.

Notice shut off valve on the supply side vertical pipe is in line with the pipe, this is the open position.
Notice shut off valve on the discharge side horizontal pipe is in line with the pipe, this is the open position.

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