| 摘要 |
A multiple four-way control valve having a spool within a cylindrical bore defined in the valve housing with first and second pressure grooves defined around the cylindrical bore communicating with first and second pressure channels defined within the valve housing with an outlet port communicating into the cylindrical bore. An inlet port communicates with the cylindrical bore through a first and second relief channel which relief channels further communicate to first and second relief grooves. A first, second, third and fourth slots are defined on the spool members adapted to align at various positions to elements of a first and second series of operation ports.
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