| 摘要 |
An automatic four-way valve hydraulically operated for extending and retracting a refuse compaction cylinder, which senses a pressure build-up as the trash is compacted, releasing a pressure responsive detent allowing a spring to drive the valve spool of the primary valve to the return position, allowing the cylinder to retract until it reaches the end of its stroke whereupon a pressure build-up causes a pilot cylinder to move the valve spool to the neutral open center position.
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