Attached is a diagram of what I was describing about the placement of the check valve in red. I was also wondering if I could place a ball valve that could be accessed on the vent pipe inside the vent supply pipe in the diagram? I'm not sure whether the ball valve has to be on the crossbar of the vent pipe? All comments appreciated!
Thanks!
Heppy
I don't believe a check valve is necessary. It would probably hinder the filling process, and could potentially fail if a small piece of trash becomes embedded in the seat. It's just as easy and less expensive to simply close off the vent tube after filling it with water. And yes, placing the ball valve on the vertical drop of the vent tube will work just as well as placing it on the horizontal crossover.
