I think you're asking 2 different questions.
The PID control toolset is for using PID loops for control; it's just software.
The DAQ card and scxi chassis are hardware. If you have the appropriate signal conditioning cards in your chassis to control/monitor your solenoid valve, then you can run a PID loop.
I believe the simple answer is: the PID control toolset is the best way to do control, but there are simple PID VI's (even on this website) that you can download and use for simple control.
Mark