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:
Quoting Removed, click Modern View to see
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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