When cam rod 1 is shifted to the left, pusher 2 lifts ball valve 3 and admits fluid from port 4 to channel 5 and port 6. At the same time, pusher 7 lifts ball valve 8 and admits fluid from port 9 to port 10. When cam rod 1 is shifted to the right, similar action is obtained with the second pair of ball valves. The balls of all four valves are held down by helical springs 11.
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