Proportional spool valve for larger volume flows

The spool valve is pilot operated by a new proportional pressure reducing valve. The main control spool can thus be controlled very precisely with a low hysteresis. The cost-optimised construction of the pilot control leads to a price reduction of the overall valve. The valve can be operated up to a volume flow of 200 l/min and a pressure of up to 350 bar. The nominal flow at a pressure drop of 10 bar is 90 l/min and can be sensitively controlled by a variable solenoid current. The valve is perfectly suitable for demanding applications, due to its high resolution, high volume flow and low hysteresis. The pilot operated valve is used where high volume flows have to be controlled. Due to the large flow range and the high stiffness of the actuation as a result of the pilot control, these valves are suitable for applications where fast acceleration and deceleration processes, high speeds and sensitive motion sequences are required. The applications are in the industrial and mobile hydraulics for smooth control of hydraulic actuations. The valve of nominal size NG10 is available as a 4/3- or also as a 4/2-way function with the designation WVPFA10. For the control, different controlling electronic devices are available, e.g. the SD7, the MD2 electronics, or the DSV or PD2 electronics that are mounted directly onto the valve.