pneumatics: 3/2-, 4/2- and 5/2-port directional control valves all directional control valves and graphical symbols can be moved function and description of the different valves the model facilitates the understanding of symbols by comparison with real valves description ordernumber 217 see also: hydraulics: directional control valves with six different pistons forces on the wedge deep-drawing toothing with re-entrant angle