I worked for a company the put up transmission lines. All bucket trucks had holding valves. I'm not quite sure if that's the same as the check valve you're talking about. A holding valve takes pressure from the control valve to unseat it and let oil pass. If there is a small leak inside the cylinder, it can only move a small amount because of the difference in the volume of oil on each side of the piston but, it takes two holding valves per cylinder to work.
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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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