CPC F16K 17/04 (2013.01) [H01M 8/04089 (2013.01); H01M 8/04201 (2013.01)] | 18 Claims |
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).
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