Not saying I'm an expert, but... I did work in a hydraulics plant for 38 years with 25 of those in the engineering experimental lab, building and maintaining test machines, and modifying customer equipment to incorporate our hydraulics.
1. Return your open center valve to somewhere in the lower reservoir... not at the suction port to the pump... you will be recirculating the hottest oil.
2. No need for a screen between the two reservoirs... what good would it do there if your return is to the bottom one?
3. A screen in the suction line from the lower reservoir to the pump is a great idea... filter on the return line from your valve would also be good.
I take it you need the extra volume for displacement in a cylinder(s), so all it needs to do is raise and lower the level in the reservoirs, so you don't cavitate your pump. Pump cavitation under pressure can be as damaging as any other contaminant... the higher the pressure the worse it gets.
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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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