Hydraulics
9803/8500
Issue 2
5 - 7
5 - 7
Descriptions
Section E Section E
Load Hold Check Valves
Operation 1
The illustration shows 'arms raise' being selected by
the lift ram spool 1.
The weight of the loaded shovel, as indicated by the
arrows, causes a higher pressure in the service line
than in the parallel gallery X. This pressure
differential causes the load hold check valve to
close, thus preventing the load from dropping.
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