John,
I think schedule 40 pvc is tested @ 200+psi.
While DWV is not tested, I have used it occaisionally for the 15-20psi pressure we have on almost all pools. For me, it was a matter of convenience. Some like the 90 degree sweeps that you can get with DWV.
In short, DWV is fine for the low pressures we encounter in pools.......I doubt a manufacturere would say that but practical experience has shown me it's okay.
I don't recall noticing any ABS other than in the molded parts like skimmers and pumps and valves.