A couple years ago, I upgraded my steering to a quick ratio power steering box. I am not going to detail every step, because those procedures have been well documented in this forum.
The one thing I could not find is a detailed explanation for anyone that wanted to remove the power steering box check valve. There were some references to using a 1/4 bolt... or an "easy out" to remove the check valve, so I used this information and documented the process. Removing the check valve is not critical, but I did read it was recommended in some of the posts I read to reduce pump back pressure and fluid temp.
Below are the steps I used (with photo links) to remove the check valve:
Location of the check valve in the power steering box/gear.
This is what the check valve looks like so you have an idea of what you are dealing with.
I found that a 10mm thread will screw itself into the check valve. I used a 10mm flat head screw for this process (it's what I had at the time), but a 10mm bolt will work just as well.
While holding the 10mm threaded portion of the bolt over the check valve, press down on the bolt a screw into the valve - BUT ONLY TIGHTEN ABOUT 1 to 1-1/2 TURNS ONCE YOU FEEL THE THREADS ENGAGE INTO THE CHECK VALVE. Be sure to keep the bolt straight into the check valve during this process.
Now remove the 10mm bolt from the check valve. You just wanted to get the bolt started into the check valve while you were able to see what was happening. Place a 10mm nut on the bolt and install all the way to the head of the bolt. Place a large flat washer over the port that has the check valve and insert the 10mm bolt thru the washer. Screw the 10mm bolt back into the check valve the same 1 to 1-1/2 turns as previously done in the step above.
Once the bolt is re-inserted into the check valve, hold the head of the bolt to keep it from turning... and begin to tighten the 10mm nut against the washer. As you tighten the nut against the washer, you will begin to pull the check valve out from the port.
Images of check valve removed from port.
Lee inserts installed into the power steering box ports.
Location of "Pressure" and "Return" ports.
Anyway, I hope the procedures and photos help anyone that decides to complete this process.