Wandfluh has equipped the roller valve with an actuating mechanism and increased the hydraulic peak performances. The valve can now switch a volume flow of 80 l/min at up to 350 bar. The actuation roller can also absorb higher transverse forces and is very well protected against contamination and corrosion. The direct operated valve of nominal size NG6 is available as a 4/2-way function with the designation WDTFA06. This valve is used for applications in which electrical elements are consciously dispensed with or where a purely mechanical actuation is required.