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

In the position of spool 3 shown in Fig. a, port 1, to which compressed air is supplied from the main, is connected to port 2, and port 4 to port 5, which leads to the atmosphere. At the same time, compressed air is admitted through channel 9 in spool 3 into left end space 7. The pressure acting on the left end of spool 3 shifts and holds it in the position shown in Fig. a. To switch over the valv…