US 11,808,369 B2
Pressure-controlled shut-off valve for a fuel cell system, and fuel cell system
Benedikt Leibssle, Stuttgart (DE); Dirk Schnittger, Ludwigsburg (DE); and Friedrich Howey, Ditzingen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/796,246
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Dec. 4, 2020, PCT No. PCT/EP2020/084604
§ 371(c)(1), (2) Date Jul. 28, 2022,
PCT Pub. No. WO2021/151563, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 10 2020 201 173.7 (DE), filed on Jan. 31, 2020.
Prior Publication US 2023/0079767 A1, Mar. 16, 2023
Int. Cl. F16K 17/04 (2006.01); H01M 8/04089 (2016.01); H01M 8/04082 (2016.01)
CPC F16K 17/04 (2013.01) [H01M 8/04089 (2013.01); H01M 8/04201 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A pressure-controlled shut-off valve (1) for temporarily interrupting the air supply to a fuel cell stack in a fuel cell system, the shut-off valve comprising a valve piston (3) which can be moved back and forth in a cylindrical housing bore (2) and which is biased in a direction of a seal seat (5) by a spring force of a spring (4), wherein a connection between an air inlet channel (6) and an air outlet channel (7) is produced or interrupted depending on an axial position of the valve piston (3), characterized in that the valve piston (3) delimits on one side a spring chamber (8) which receives the spring (4) and to which ambient pressure is applied, and on an other side a control chamber (9) which is connected to the air inlet channel (6) within the housing bore (2), and, wherein the valve piston (3) has an annular collar (10) with a lamer diameter than a seat diameter (Ds) of the seal seat (5).