公开(公告)号：US4072169A

公开(公告)日：1978-02-07

申请号：US702860

申请日：1976-07-06

申请人： Joachim Heiser ,  Rainer Hoheisel ,  Heinz Flaschar ,  Heinz Gand ,  Heinz Kleinschmidt ,  Konrad Braunlinger ,  Klaus Sopha ,  Roland Schempp ,  Hermann Sanzenbacher

发明人： Joachim Heiser ,  Rainer Hoheisel ,  Heinz Flaschar ,  Heinz Gand ,  Heinz Kleinschmidt ,  Konrad Braunlinger ,  Klaus Sopha ,  Roland Schempp ,  Hermann Sanzenbacher

IPC分类号： F15B11/08 ,  F15B13/043 ,  F16K11/07

CPC分类号： F15B13/043 ,  Y10T137/86614 ,  Y10T137/87185

摘要： A hydraulic control system has a three-position valve which in its central position disconnects the high-pressure and low-pressure sides of a pressure source from outlet lines but connects these sides of the source together through a low-pressure valve. Moved to either of its end positions the valve is disconnected from between the sides of the pressure source and the output lines are connected to the high-pressure and low-pressure source sides. A pressure-limiting valve is connected between the sides of the source. In addition, the high-pressure side is connected via pressure-reducing valve and a restriction to a pair of pilot valves which are in turn connected to the low-pressure side. These pilot valves are also connected to opposite chambers of a pilot cylinder that controls the valve body. The pressure-reducing valve between the pilot valves and the high-pressure side maintains a medium-pressure level in the system when the valves move from its central position.

摘要翻译： 液压控制系统具有三位置阀，其中心位置将压力源的高压侧和低压侧与出口管线分离，但是通过低压阀将源的这些侧面连接在一起。 移动到其任一端，阀从压力源的侧面断开，输出线连接到高压和低压源侧。 限流阀连接在源的侧面之间。 此外，高压侧通过减压阀和限制器连接到一对先导阀，导向阀又连接到低压侧。 这些先导阀也连接到控制阀体的先导缸的相对的腔室。 当阀门从中心位置移动时，先导阀和高压侧之间的减压阀在系统中保持中压水平。