| 摘要 |
A rotary four way tandem center valve including a spool member provided with a central spool projection with four axially extending grooves in its outer peripheral surface and two intersecting channels defined therein, a first and second operation port, an inlet and outlet port, and means for directing pressure passing from the inlet port to the outlet port to a selected one of said operation ports while at the same time relieving pressure in the other operation port.
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