That's interesting... For a while, we were thinking of using them too. They are (what I would consider) a flow control valve.
We've put
these on our robots for years. I may be remembering wrong, but I think something like that may have been given in the kit in years past.
What's stopping you from getting a solenoid valve with a really high flow rate, then connecting it directly to the cylinder? Also, you'll only need this valve on the retract side, so you could go with a spring/gravity return.