Spool type, pilot operated directional solenoid valves available in three or four way configurations. They are operated by a directional valve type SDHL (see technical table SHE018) equipped with threaded solenoids for AC or DC power supply. Spools are fully interchangeable and they are available in a wide range of hydraulic configurations. The valve body is made by shell-moulding castings machined by transfer lines and then cleaned by thermal deburring. Optimized flow paths largely cored with extrawide channels to tank ensures low pressure drops.