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Thank all of you for reply. This backflow prevention device never leaks before. The leaking happened right after I opening and closing the faucets in the fire sprinkler system. So I suspect that there is something to do with the opening and closing of the faucets. The faucets is labeled as...

I guess that the leaking could be due to the debris in the public water, because the leaking is after I did the draining operation by turning on the faucet in the fire sprinkler system. Maybe I can turn on the faucet one more time, so the debris in the backflow prevention device will go away...

My home has a fire sprinkler system. Today I found that there is water leaking from the pipe. It is about one drip every 5-6 seconds. The location is labeled by the pink color in the pictures. There is a pressure-reduce valve after the water meter. I donot know the name of the component of...