Yes, a simple check valve will not work because it would block the return flow when you wanted to lower it. There is such a thing as a pilot operated check (what we called them at Cessna/Eaton), maybe what your mechanic calls a 2 way check, where the valve will "check" the flow until the other side is presurized and then a small pilot line will "unseat" the check and allow flow backwards through the check valve. One of these will do what you want to do and this may be exactly what that block in front of the seat is, I'm not sure. A valve like I recommended earlier will not prevent "creep" with a heavy load, but would control how fast a heavy implement dropped when you move the valve lever to lower it. I thought that was the problem. If it's to prevent a creep down situation, then the pilot operated check is what you need. Then the only thing left that will let it creep down is a leaking cylinder. Often wish I could draw a hydraulic circuit and post it, it would help understand how these things work. Although I know how to draw hydraulic schematics (did this for a living for years), I wouldn't know how to post them.
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