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THREE-WAY TWO-POSITION POPPET-TYPE PILOT-OPERATED PNEUMATIC DIRECTIONAL VALVE MECHANISM

The directional valve shown in Fig. a can be employed either as a normally closed or normally open valve, which is pilot-operated from one side. When used as a normally close valve, compressed air is supplied from the main to port 1, and port 2, the outlet port, is connected through a channel in valve member 5 to port 3, which is connected to the atmosphere. The valve is operated when compressed p…