PVC vs DWV?; sweep 90's?; T's vs Y's?

[MitchRyan912]

I'm in the midst of re-piping and was wondering what kind of pipes I should be using? Is DWV not as good as Schedule 40 PVC? Would DWV sweep 90's be better than PVC 90's that little to no curve in them? If I had to tie two pipes together, would joining them with a T be better/different than using a Y?

This the previous piping job, where the left valve shuts off the vac line and the right valve shuts off the skimmer. The rightmost line is the shallow end return line. Just curious about the flow of all of this piping, if there was a better way to do it?

 

[tim5055]

DWV is drain pipe and not rated for pressure.

 

[stebs]

And make sure you don't use dwv fittings either... They have shallower sockets for the pipe to fit into than regular schedule 40 pressure fittings do....

 

[Isaac-1]

Note that a lot of 1.5 and 2 inch PVC pipe is dual rated DWV and Schedule 40, those are fine to use, just don't use DWV fittings like those swept 90's on anything