First thing, make sure there's supposed to be a gasket. AFAIK those valves are only sealed with Orings, and a gasket will spread the metal parts too far apart and weaken the seal.
That said, I'd also look for blockages in the system downstream that are preventing the oil from returning to the reservoir and causing the pressure to build up.
From the way it sounds the relief valve is not working and if you put it together so the gasket can't blow, something else will blow. Probably, something expensive and/or no longer available as a replacement part.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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