Patent ID: 9505288
Filing Date: 2016-11-29
CPC Classification: B60G,F15B,F16F,F16K,Y10T

Claim Text:
1. A proportional directional control valve for controlling a hydraulic consumer, comprising: a housing comprising a pressure port for feeding pressurized hydraulic fluid from a pressure medium source, a tank port for discharging the hydraulic fluid to a reservoir, a first and a second working port for connecting to the hydraulic consumer, a control element that is movably held in the housing, and a single actuator for moving the control element, the control element, in dependence on its position relative to the housing, enabling different flow paths between the first and the second working ports and the pressure port and the tank port, and flow cross-sections of the flow paths being changeable in a continuously variable manner in dependence on an adjustment travel of the control element, the control element, starting from a first switching position in which both the first and the second working ports are connected to the tank port, being movable by means of the actuator via a second switching position that directly follows the first switching position, into a third switching position that directly follows the second switching position, wherein: by moving the control element from the first switching position via the second switching position into the third switching position, the first and the second working ports are successively disconnected from the tank port and connected to the pressure port, and pressure forces of the hydraulic fluid acting on the control element in a direction of movement of the control element and counter to the direction of movement of the control element cancel each other out in all switching positions of the control element.