backflow preventer oveflowing
I had to replace the bonnet and poppet on my backflow preventer when I went to turn on my sprinkler system. However, when I turn it on with minimal water pressure, water comes up over the top of the new bonnet and poppet. I'm afraid that if I turn the water pressure higher, it will simply blow the bonnet and poppet again. Any ideas on what might be causing this? Could it be a problem with the check valve? How do you determine if the check valve needs to be repalced?