Proportional Directional Valve PDFC

Series PDFC­10… proportional directional valves are direct acting screw­in cartridges with a sliding spool design and a 7/8­14 UNF mounting thread. In the neutral position, port 3 is closed and depending on the spool type, ports 2 and 4 are connected to tank (1) (spool configuration M) or ports 1, 2 and 4 are all blocked (spool configuration L). The version with the M spool is used in motor control circuits where free­wheeling in the neutral position is required. The L configuration is the version to use for cylinder applications. These cartridges are particularly suitable for precise and controlled lifting and lowering movements and can also be used for reliable operation in mobile and industrial applications. Best controllability is achieved when using the valve with a bypass pressure compensator to control pressure drop through the valve. Using the valve without pressure compensator is not recommended because higher pressure drops cause the flow to be more restricted (see performance graph). The proportional directional valves is optionally equipped with a manual over­ride which is detented in the neutral position