Called out to repair a Wilkins 975XL that was leaking out of the Relief Valve.
When called out to inspect a backflow device, all the numbers on the gauge looked good. The problem was the device relief valve was spitting or dumping regularly. When the device was supposed to dump or open at above 2.0 on the relief valve, it just would not open up.
This was a great time to take apart the Reduced Pressure Assembly relief valve and check for debris. There was scale so thick that it prevented the diaphragm from opening or closing.
We were able to clean out the debris and get the device to start working properly.
This is a Wilkins 975XL 1″ RP located at a water treatment facility.