Being a registered professional engineer I can't recommend it, but at 3 psi you will be OK if you absolutely limit the pressure to 3 psi. One easy way to do that is to put a large nozzle on top with a weight on it. You don't mind if the nozzle leaks a little air. For instance, a 2" sch 40 pipe has an internal area of 3.36 sq inches. At 3 psi that takes 10 lbs to hold the pressure. If you put a 4-1/2" round steel plate on the top that is 2" thick (or four 1/2" plates) that is about 9 lbs. With a normal air hose you would never overpressure a tank with a relief valve like that. too much leakage and the plate will vibrate off and leave a full 2" vent.
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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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