When Pressure Fluctuations cause the RP to go into a continuous Water Hammer Dump
We came across an RP that got into a water hammer situation that it could not recover from. After Replacing the Seat and Disc for the number 1 Check Valve and raised the reading on the number 1 check from 5.0 to 8.2. Great pressure swings still caused the RP to Rock with Water Hammer. We could not leave the Backflow Prevention Assembly in the vulnerable state, with out putting the water hammer arrestor on it. It solved the problem.
Be Sure to install the Water Hammer Arrestor on the first test cock. Don’t forget to open the first test cock.