US 11,754,097 B2
Electrohydraulic system for a valve
Alexandre Orth, Hettstadt (DE); Gottfried Hendrix, Gemuenden (DE); and Tor Jensen, Ski (NO)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/755,392
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Oct. 20, 2020, PCT No. PCT/EP2020/079439
§ 371(c)(1), (2) Date Apr. 28, 2022,
PCT Pub. No. WO2021/083724, PCT Pub. Date May 6, 2021.
Claims priority of application No. 10 2019 216 878.7 (DE), filed on Oct. 31, 2019.
Prior Publication US 2022/0403860 A1, Dec. 22, 2022
Int. Cl. F15B 15/06 (2006.01); F15B 20/00 (2006.01); F16K 31/163 (2006.01)
CPC F15B 15/065 (2013.01) [F15B 20/002 (2013.01); F15B 2211/30505 (2013.01); F15B 2211/8623 (2013.01); F15B 2211/8752 (2013.01); F15B 2211/8755 (2013.01); F16K 31/1635 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electrohydraulic system for a valve, which is configured to drive a valve in rotation, wherein the system comprises the following:
an output shaft configured to connect directly to the valve to rotationally drive the valve, the output shaft extending along a first axis;
a hydraulic piston configured to be activated by a pressure medium and to rotate the output shaft, the hydraulic piston extending along a second axis which is perpendicular to the first axis, the hydraulic piston being guided into a first cylinder housing and a second cylinder housing;
a pretensioning mechanism comprising an elastic element extending along a third axis and at least one hydraulic cylinder that is connected to at least one of the first and second cylinder housings, the pretensioning mechanism configured to store energy generated by pretensioning the elastic element and to transmit said energy to the output shaft in the event of a fault to secure a predetermined position of the output shaft, the pretensioning mechanism being pretensioned by the at least one hydraulic cylinder; and
a first shut-off valve configured to decouple the pretensioning mechanism from the hydraulic piston, the first shut-off valve arranged between one of the first and second cylinder housings and the hydraulic cylinder and having a first shut-off direction from the hydraulic cylinder toward the one of the first and second cylinder housings.
 
11. An electrohydraulic arrangement comprising:
an electrohydraulic system comprising:
an output shaft configured to connect directly to a valve to rotationally drive the valve, the output shaft extending along a first axis;
a hydraulic piston configured to be activated by a pressure medium and to rotate the output shaft, the hydraulic piston extending along a second axis which is perpendicular to the first axis, the hydraulic piston being guided into a first cylinder housing and a second cylinder housing;
a pretensioning mechanism comprising an elastic element extending along a third axis and at least one hydraulic cylinder that is connected to at least one of the first and second cylinder housings, the pretensioning mechanism configured to store energy generated by pretensioning the elastic element and to transmit said energy to the output shaft in the event of a fault to secure a predetermined position of the output shaft, the pretensioning mechanism being pretensioned by the at least one hydraulic cylinder; and
a first shut-off valve configured to decouple the pretensioning mechanism from the hydraulic piston, the first shut-off valve arranged between one of the first and second cylinder housings and the hydraulic cylinder and having a first shut-off direction from the hydraulic cylinder toward the one of the first and second cylinder housings; and
a housing in which the electrohydraulic system is mounted, the housing having an elongated form extending along the output shaft,
wherein a cross-section, taken perpendicular to the output shaft of the housing and close to an end section of the housing, has two pairs of edges, each pair of edges including two edges that are parallel to each other.