If anyone needs head loss specs for Pentair, Hayward, Praher or Sta-Rite multiport valves, the following info may help.
I had no luck on Pentair website finding head loss curves for the Pentair 261055 multiport valve I am installing on a Pentair Quad DE filter. So, I found this information from the Praher website (Praher Plasitcs appears to be the manufacturer of some Pentair, Hayward and Sta-Rite multiport valves).
Page 31 of the Praher catalog has cross references for these multiport valves:

SM2-PP2 is the Praher model# which is cross referenced to the Pentair 2" Multiport Valve for DE filters. The owners manual for these Praher multiport valves includes head loss graphs:

I had no luck on Pentair website finding head loss curves for the Pentair 261055 multiport valve I am installing on a Pentair Quad DE filter. So, I found this information from the Praher website (Praher Plasitcs appears to be the manufacturer of some Pentair, Hayward and Sta-Rite multiport valves).
Page 31 of the Praher catalog has cross references for these multiport valves:

SM2-PP2 is the Praher model# which is cross referenced to the Pentair 2" Multiport Valve for DE filters. The owners manual for these Praher multiport valves includes head loss graphs:
