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

Incoming pilot air at port a (Fig. a) shifts plunger 1 downward and compressed air is admitted through the port in intermediate cover 2 and the central channel in sleeve 3 to the right end of the main valve to shuttle spool 4 to the left. At the same time, air passes through a hole in plunger 1, to the space under the plunger, and fills space 5. Since the lower area of plunger 1 is greater than it…