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FIVE-WAY TWO-POSTION SPOOL-TYPE PNEUMATIC DIRECTIONAL VALVE MECHANISM

Air is supplied from the main through port 1 and further through internal channel 7 of spool 3 to the left end space of the spool (Fig. a). When pilot air is admitted through port 8, then, since the cross-sectional area of piston 9 is considerably greater than that of spool 3, the spool is shuttled to the position shown in Fig. a. At this, port 1, to which compressed air is supplied from the main,…