公开(公告)号：EP0943057A1

公开(公告)日：1999-09-22

申请号：EP97953751.0

申请日：1997-12-06

Applicant: Mannesmann Rexroth AG

Inventor： STELLWAGEN, Armin

IPC: F16K3 ,  F15B11 ,  F15B13 ,  F16K11 ,  F16K17

CPC classification number: F15B11/05 ,  F15B13/0402

Abstract: The invention relates to distributing valve for load-independent control of a hydraulic consumer with regard to direction and speed. Similar distributing valves known per se have a control valve (30) which can be axially displaced in a slide bore hole (11) of a valve housing (10). In a neutral position, said control valve (30) blocks off two consumer chambers (13, 15) from a feed chamber (14) and selectably connects one of the two consumer chambers (13, 15) to a feed chamber (14) and the other consumer chamber (15, 13) to a return chamber in two operating positions. In addition, two brake pistons (51, 52) are arranged in two opposite lying receiving areas (33, 34) of the control valve (30). Both pistons can be pressurized in the direction of an enlargement of the opening section of a flow path leading from one consumer chamber (13, 15) to a return chamber (12, 16) via the respective receiving area, said pistons being pressurized in the other consumer chamber (15, 13) in a direction opposite to that of a spring (53) placed in a spring chamber (12). According to the invention, a slide longitudinal bore hole (36) which can be connected to a load indicator channel (22) extends from one pressure chamber (58) on one brake piston (51, 52) to the other pressure chamber (58) on the other brake piston (51, 52), and can be connected, upon displacement of the control valve (30) from the neutral position, to one consumer chamber (13) or another consumer chamber (15) depending on the direction of displacement.

公开(公告)号：EP0972138A1

公开(公告)日：2000-01-19

申请号：EP98919168.9

申请日：1998-03-27

Applicant: Mannesmann Rexroth AG

Inventor： BÜTTNER, Peter ,  STELLWAGEN, Armin

IPC: F15B20/00 ,  B29C45/84

CPC classification number: F15B20/002

Abstract: The invention relates to a hydraulic control device, comprising a directional valve (13), a hydraulic pump (18), and a built-in two-way valve (52) configured as a seat valve. The directional valve (13) is connected to an inlet line (34) and to a drain line leading to a tank, from which a consumer line (16, 17) leads to a hydraulic consumer. The hydraulic pump (18) suctions pressure means from the tank (19) and delivers it to the inlet line (34). The built-in two-way valve (52) is arranged in the inlet line (34) and when closed, separates a second inlet line section (60) leading to the directional valve from a first inlet line section running between said section and the hydraulic pump (18). A control piston belonging to the built-in two-way valve has a ring-shaped opening surface (64) which is subjected to the pressure inside the first inlet line section; a second central circular opening surface (65) which is subjected to pressure inside the second inlet line section, and a closing surface (62) which can be subjected to pressure in the first inlet line section (34) via a pilot valve (53) when said valve (53) is in a first control position and whose pressure can be discharged into the tank (19) via said valve (53) when the pilot valve is in a second control position. The built-in two-way valve (52) is closed when an emergency shutdown is activated. In order to meet particularly stringent safety requirements, the invention provides that the second inlet line section (60) can be discharged into the tank (19) via the pilot valve (52) when said valve is in a first control position.

公开(公告)号：EP0746713B1

公开(公告)日：1999-09-01

申请号：EP95909751.0

申请日：1995-02-21

Applicant: Mannesmann Rexroth AG

Inventor： STELLWAGEN, Armin

IPC: F16K27/02

CPC classification number: F16K27/02

Abstract: The invention concerns firstly a hydraulic valve, more particularly a pressure-relief valve, with a sleeve-shaped valve housing (10), which can be inserted in a bore (11) in a receiving part (12). In particular, the valve has a first, rear section (13) which can seal the valve into the bore, a second section (14), located further forward, which can be moved further forward into the bore (11) and which, together with the bore, can form an annular space (19), and a third section (15), located in front of the second section, with a male screw thread for screwing the valve into the receiving part (12). To obtain a valve housing which is thin-walled and therefore space-saving, the interior (35) of the valve housing (10) in the region of the third section (15) is designed as an internal polygon (30), accessible in particular from the rear. The necessary torque can thus be introduced directly into the section bearing the male thread, bypassing the other sections. The invention also relates to a process for producing a hydraulic valve of the type according to the invention. In this process, the valve housing is made from a semi-finished product in the form of a tube.