Abstract: An anode gas circuit of a fuel cell system. The anode gas circuit includes a return line leading from an anode gas outlet of a fuel cell stack to an anode gas inlet of the fuel cell stack, a recirculation blower disposed in the return line, a first valve disposed in the return line upstream of the recirculation blower, and a second valve disposed in the return line downstream of the recirculation blower. The first valve and the second valve are configured to close a cross section of the return line.

Abstract: A high-pressure valve comprises an intake channel and two outlet channels. Further, an actuator is provided for opening and closing the outlet channels. According to the invention, the actuator is provided with a connection channel. The connection channel makes it possible to reduce a pressure difference between the intake channel and the closed outlet channel prior to opening the outlet channel. For this purpose, a channel opening will be opened by displacement of a control element arranged in the connection channel.

Abstract: A flap valve for fuel aggregates, such as fuel cells, comprises a flap arranged within a flow channel. A shaft for pivoting the flap is connected to the flap. Further, a seal disposed in a recess of the channel wall is provided, which comprises at least one pressure pocket connected with the flow channel.

Abstract: A flap valve for fuel aggregates such as fuel cells comprises a flap (14) arranged within a flow channel (24). A shaft (16) for pivoting the flap (14) is connected to the flap (14). Further, a seal (30) disposed in a recess (36) of the channel wall (38) is provided, which comprises at least one pressure pocket (32,34) connected with the flow channel (24).

Abstract: A high-pressure valve comprises an intake channel (10) and two outlet channels (12,14). Further, an actuator (16) is provided for opening and closing the outlet channels (12,14). According to the invention, the actuator (16) is provided with a connection channel (34,36). The connection channel (34,36) makes it possible to reduce a pressure difference between the intake channel (10) and the closed outlet channel (14) prior to opening the outlet channel (14). For this purpose, a channel opening (34) will be opened by displacement of a control element (22) arranged in the connection channel (34,36).