Valve spool f is shifted by lever 2 which is connected by turning pairs A and B to spool 1 and to link 3. Link 3 turns about fixed axis E. Lands a of the spool divide the inner space of the valve into two chambers: chamber 6, connected by port d to the high-pressure main, and chamber c, connected by port e to the low-pressure main. In the extreme left-hand position of the spool (as shown), fluid from the high-pressure main is directed to port f, and that from the low-pressure main to port g. In the extreme right-hand position of the spool, fluid from the high-pressure main is directed to port g and that from the low-pressure main to port f.
$3923$LHP,FC$