US 11,815,918 B2
Preselection valve, hydraulic valve assembly and hydraulic control device
Thomas Wechsel, Neubiberg (DE); Walter Steiler, Baldham (DE); and Martin Heusser, Munich (DE)
Assigned to HAWE Hydraulik SE, Aschheim (DE)
Filed by HAWE Hydraulik SE, Aschheim (DE)
Filed on Mar. 2, 2022, as Appl. No. 17/684,689.
Claims priority of application No. 102021202207.3 (DE), filed on Mar. 8, 2021.
Prior Publication US 2022/0283597 A1, Sep. 8, 2022
Int. Cl. G05D 16/10 (2006.01); F15B 13/02 (2006.01); G05D 16/04 (2006.01)
CPC G05D 16/101 (2019.01) [F15B 13/02 (2013.01); G05D 16/0404 (2019.01)] 20 Claims
OG exemplary drawing
 
1. A preselection valve for a hydraulic valve assembly having a switching element, a pressure input line, a first pressure output line, and a first load pressure line with at least one load pressure inlet and at least one load pressure outlet, wherein the switching element can be switched from a neutral position to a first switching position and the pressure input line is connected to the first pressure output line in a first switching position of the preselection valve, the preselection valve comprises:
a second load pressure line;
a third load pressure line; and
a load pressure increasing device for load pressure increase;
wherein;
the second load pressure line branches off from the pressure input line upstream of the switching element;
the load pressure increasing device is connected to the third load pressure line;
the third load pressure line connects the load pressure increasing device to the first load pressure line;
the second load pressure line is connected to the load pressure increasing device in the first switching position; and
the second load pressure line is blocked in the neutral position.