How many watts of your solenoid?
I use something similar. But its rated for nearly 140 psi.
I have to replace only the solenoid coil. I use an industrial solenoid, the coil is about 2 inches in diameter and runs off the mains. The coil fails after 3-4 years of use. These are locally manufactured and each separate component can be replaced individually. I am quite happy with them lasting 3-4 years. Replacing the coil takes less than 2 minutes and I don't have to dismantle the setup.
Some times "Good Enough" is better that "Perfect" since the price difference is huge, almost 10 times.