Fluid Power Symbol


  • Max Flow

    : 65 l/min

  • Max Pressure

    : 350 bar

  • Cavity

    : M33 acc. to ISO 7789–33–01–0–98

  • Leakage

    : On request

Proportional throttle valves are suitable for precise feed control systems. Very sensitive opening and closing characteristics allow smooth control of movements in stationary or mobile installations, e.g. machine tools, public vehicles. Installation of the screw-in cartridge in control blocks as well as in sandwich plates (vertical stacked systems) and flange valves of the NG10 size. Cavity tools are available for machining the cavities in steel and aluminium.

The force controlled proportional solenoid running in the fluid acts directly on the control spool which opens or closes the triangular shaped throttling notches in the cartridge body. The throttle opening, and therefore the flow volume, changes proportionally to the current absorption of the proportional solenoid. When the solenoid is without current, the control spool is held in the closed position by a spring. To control the valve proportional amplifiers are available from Wandfluh (see register 1.13).

Direct operated proportional throttle valve. Thread M33x2 and cavity in accordance with ISO 7789. Two flow ranges are available. The volume flow is adjusted by a proportional solenoid (VDE standard 0580). Progressive increase and decrease of volume flow and reduced hysteresis are characteristics of this valve. The cartridge body is made of steel. Its special surface coating protects the outside against corrosion and reduces friction of the control spool. The solenoid is zinc coated.