| 摘要 |
PURPOSE:To make a circuit system compact in size as a whole, by calculating the discharge flow of a directional control valve from a spool position of the valve and pressure in each of pressure oil input and output ports. CONSTITUTION:A position sensor 13 is installed in a spool 3d of a directional control valve 3, while each of pressure sensors 14-16 is installed in pressure oil output ports 3a, 3b and a pressure oil input port 3c, and each output out of these sensors 13-16 is inputted into an operational device 17, thus discharge flow of the directional control valve 3 is calculated. With this constitution, such a flow sensor as having large dimensional size is no longer required for the directional control valve 3, thereby enjoying both directional selection and flow measuring functions in combination, so that a circuit system is made so compact in size as whole. |
