SPOOL-TYPE DIRECTIONAL VALVE MECHANISM

To accomplish a certain required operation, spool 1 is shifted to the left. At this, fluid delivered by the pump along channel 2 is admitted to port 3 and further to the working main. Return flow passes through port 4 and an axial channel of spool 1 to port 5 and into the tank. For the next operation, spool 1 is shifted to the right, admitting fluid from channel 2 into port 4. Return flow passes t…