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

Compressed air is supplied from the main to port 1 (Fig. a), two channels in the valve body and through throttling orifices 12 (Fig. b) into end spaces 2 and 3. At this, ports 4 and 5 are shut off by two-port pilot valves and spool 11 is in the position shown in Fig. a. In this position air is admitted from port 1 into port 6, which is connected to one end of the operating cylinder or device. Port…