[Jerf123]

This one is my Fathers we use it to compact our ditches,Now days. but in the 90's he was breaking 24" Runway at Edwards AFB. And i am with you there are people out there a lot smarter than me, who prob know all about them.
But what i have so far is a trial valve i am making. The hard part is this valve TO Me is a hydraulic ram its self , but also a 4 way valve ??

The first picture is my idea and design.
The second one is what i have so far. not close to being finished, I still need to cut one more piston on the stock and make a new cylinder,now longer .
The third photo is the rotary valve that,when engaged flips and sends pressure to the top of my valve, thus making it auto up and down ?? Maybe some one can correct me or give advise ?