I believe that is a pilot operated check valve block that helped keep the load from drifting down. Took everything out of the system except the cylinder itself... if the cylinder leaked by the piston, it would settle anyway. The way they work is when pressure is applied to one side, an internal "pilot" line opened the opposite or return side of the line. Again, if the cylinder had an internal leak, this valve didn't help that.
I know Cessna/Eaton made them at one time and many were used on loader buckets to help stop the bucket from dumping the load as it was being carried. You could find them mounted on a cross-beam behind the bucket of a loader. One of these might work if you can find one.
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