Resistor in series with Solenoid Valve (for voltage reduction)
When given 14V into an 9 ohm load would give you 1.55A. 

If you double both, 28V into an 18 ohm load give you the same 1.55A. The DC resistance of the coil is what is going to be the limiting factor to the inrush. All of that works. 

The problem is the power. The resistor is going to be dropping 14V. That means that the power dissipated is going to be 14^2/9 = 21.7W That is a lot of power to dissipate.