Posted by mEl on March 31, 2015 at 06:42:02 from (96.243.113.64):
In Reply to: Hydraulic valves posted by buickanddeere on March 31, 2015 at 06:15:54:
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Vic, I spent my life working on Case hoes (50 yrs) and am very familiar with their systems. The Case hoes before closed center never had a stacked valve without a 3rd line to sump. All recent, since some early Case systems use the loader relief to control backhoe pressure as well so the protection from the low pressure being subjected to the low pressure circuits within the loader valve is taken to sump by the 3rd (tank) line off the loader valve.
The hoe valves have a dedicated low pressure circuit which goes back to the outlet to tank from the low pressure circuit within the hoe valve. Case uses a poppet and spool to direct low pressure back into the high pressure to suppliment pump flow as when the boom is dropped into a deep hole to prevent cavitation.
All Case systems are designed to keep oil pressures from bearing against spool seals and returning to the backside of the main relief.
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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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