backflow preventer oveflowing

Dear visitor, welcome to SPRINKLER TALK FORUM - You Got Questions, We've Got Answers. If this is your first visit here, please read the Help. It explains how this page works. You must be registered before you can use all the page's features. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.

LEH

Unregistered

Friday, May 28th 2010, 7:22pm

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?