Just to wrap this up, here is the response I received from FESTO on using their CPE10 valves (e.g. CPE10-M1BH-5/3G-M7-B, CPE10-M1BH-5J-M7):
"The valves you are requesting are only tested with flows at 6 bar (90psi) and at 90 psi they are right on the 0.32 Cv. They are our compact series and designed for industrial settings, that is why the 90 psi test. The connectors you specify (QSM-M7-1/4-I-U-M) will be correct for your application. As for the cables a part number for the 2.5 meter cable is 193687 KMYZ-9-24-2.5-LED-PUR-B. The coil is not polarity sensitive so it will not matter the connection direction."
This is counter to the equations above, but is an e-mail from their tech support documentation enough?
