Control System: Model a simple flow valve
The paper is a bit sloppy about transfer functions. If \$G_V\$ is the transfer from function from control pressure to flow, then it needs an offset. Step response should be measured for a step from 3 to 15 psi.

Unless you also model the DAC and the "current to pressure converter" with correct gains and offsets, any PID gain will be meaningless anyway. The charts have a scale from 0 to 1 for "output". That does again not correspond with control voltage or pressure.

Use common sense to implement this in Simulink!