EP 0972138 A1 20000119 - HYDRAULIC CONTROL DEVICE
Title (en)
HYDRAULIC CONTROL DEVICE
Title (de)
HYDRAULISCHE STEUERANORDNUNG
Title (fr)
SYSTEME DE COMMANDE HYDRAULIQUE
Publication
Application
Priority
- DE 19714141 A 19970405
- EP 9801809 W 19980327
Abstract (en)
[origin: US6250202B1] A hydraulic control arrangement which has a directional control valve, a hydraulic pump and a two-way cartridge valve constructed as a seat valve. The directional control valve is connected to an inlet line and to a discharge line leading to a tank. Leading off from it is a load line leading to a hydraulic load. The hydraulic pump draws pressure medium from a tank and discharges it into the inlet line. The two-way cartridge valve is arranged in the inlet line and, in a closed position, isolates a second inlet line section leading off from the latter to the directional control valve from a first inlet line section running between the two-way valve and the hydraulic pump. A control piston of the two-way cartridge valve has an annular opening surface exposed to the pressure in the first inlet line section, a central circular opening surface exposed to the pressure in the second inlet line section, and a closing surface, which can be subjected to the pressure in the first inlet line section via a pilot valve in a first position of the latter and can be relieved from the pressure to the tank via the pilot valve in a second position of the latter. The two-way cartridge valve closes when an emergency off facility is triggered. To satisfy particularly high safety requirements, the invention makes provision for the second inlet line section to be relieved to the tank via the pilot valve in the first position of the latter.
IPC 1-7
IPC 8 full level
B22D 17/32 (2006.01); B29C 45/82 (2006.01); B29C 45/84 (2006.01); F15B 20/00 (2006.01)
CPC (source: EP US)
F15B 20/002 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE FI FR IT SE
DOCDB simple family (publication)
US 6250202 B1 20010626; AT E239175 T1 20030515; DE 19714141 A1 19981008; DE 59808168 D1 20030605; EP 0972138 A1 20000119; EP 0972138 B1 20030502; JP 2001519010 A 20011016; WO 9845603 A1 19981015
DOCDB simple family (application)
US 40257799 A 19991001; AT 98919168 T 19980327; DE 19714141 A 19970405; DE 59808168 T 19980327; EP 9801809 W 19980327; EP 98919168 A 19980327; JP 54232598 A 19980327