Direct operated proportional directionalvalveswithout position transducer andwith posiive spool overlap for open loopdirectional controls and not compensatedflow regulations They operate in association withelectronic drivers, see section 2, whichsupply the proportional valves with propercurrent to align the valve regulation to thereference signal.The spools are available with linear L,progressive Sor differential Dflowcharacteristics.The valve body is 3 chambers type forSDHZE and SDKZE.The solenoid coils are available withdifferent nominal resistances dependingto the voltage supply to the driver (12 VDCor 24 VDC) and to the electronic drivercharacteristics, see section 2 and 3.