I've seen a lot of "Gresen" valves but never one that looks even remotely like yours.
It MAY have been custom-made for a specific application on some machine and not be "convertible" to double-acting use.
As you you have found, "Gresen J8" doesn't bring up any info on the 'net, are you SURE there isn't another part number stamped somewhere on the valve?
I believe in saving and re-purposing as much as anyone, but if no info can be found sometimes a guy's just got to quit beating a dead horse and move on.
You can buy a new single spool valve for $80 and up, comes a point maybe that's the thing to do, if no more numbers or information can be found.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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