Proportional directional spool valves type PSL and PSV

The directional spool valve bank in series design is available in three sizes in type
PSL for constant delivery pump systems and type PSV for variable displacement pump
systems (pressure/flow controller). It is intended for load-independent, continuous
control of the movement speed of hydraulic consumers. Several consumers can be
operated simultaneously and independently from each other. The application area
of this valve type is mostly in mobile hydraulics (e.g. crane control). Being able to
select different maximum volumetric flows for consumer ports A and B as well as
the option to use various additional functions (e.g. secondary pressure limitation,
function deactivation, in the basic valve, in intermediate plates and ancillary blocks)
guarantees optimal adaptation to the respective control tasks.

READ MORE at http://www.hawe.de/fileadmin/content/typeman/catalog/Pdf/A/K_PSL-en.pdf