US 7,320,272 B2
Hydraulic system
Thomas Zitterbart, Dietenheim (Germany)
Assigned to Liebherr-Hydraulikbagger GmbH, Kirchdorf/Iller (Germany)
Filed on Aug. 02, 2005, as Appl. No. 11/196,518.
Claims priority of application No. 10 2004 037 460 (DE), filed on Aug. 02, 2004.
Prior Publication US 2006/0021341 A1, Feb. 02, 2006
Int. Cl. F15B 11/08 (2006.01); F16K 15/02 (2006.01); F15B 13/00 (2006.01)
U.S. Cl. 91—420  [91/468] 11 Claims
OG exemplary drawing
 
1. A hydraulic system comprising: a hydraulic supply, a consumer and having a control valve, which is arranged between the hydraulic supply and consumer and is in communication with the consumer via a first line and a second line, where the control valve can be switched into different positions, and the control valve connecting the hydraulic supply to the first line in at least one position, wherein a first valve, which is in communication with the first line and the second line is provided, and wherein a third line, which is in communication with the first valve and does not lead to or open out in the control valve, is provided, the first valve being connected in such a manner that when pressure is applied to the first line it opens up a connection between second line and third line, wherein the control valve, in at least one position, connects the hydraulic supply to the second line, and wherein a second valve, which is likewise in communication with the first line, the second line and the third line and is connected in such a manner that when pressure is applied to the second line it opens up a connection between first line and third line, is also provided and where the first valve or the second valve are designed as spring-loaded seat valves or as slide valves.