Abstract: A fuel cell system has at least one fuel cell which includes an anode compartment and a cathode compartment, and a recirculation line for anode gas which leads from a gas outlet of the anode compartment to a gas inlet of the anode compartment and in which an ejector pump is arranged. The ejector pump includes a first nozzle and at least one second nozzle which is in the form of a ring nozzle arranged coaxially around the first nozzle. A respective fuel gas valve is associated with a respective nozzle and controls a supply of pressurized fuel gas to a primary gas inlet of the respective nozzle. In a low load range, only the first or only the at least one second nozzle of the ejector pump is selectively supplied with primary gas, whereas in a high load range both nozzles are supplied with primary gas simultaneously.

Abstract: A fuel cell system is provided having a fuel cell and a jet pump control valve unit connected to an anode chamber with an intake connection and a pressure connection. A fuel gas control valve connecting a fuel gas source and the jet pump has a valve seat with a first sealing surface and at least two through-flow channels, and a moveable valve body with a second sealing surface. The valve body can be moved into a blocking position and a through-flow position using a valve body actuator. The sealing surfaces rest on one another in a common sealing plane and form a seal in the blocking position. A stroke gap is formed between the sealing surfaces in the through-flow position. The first or second sealing surface is arranged on a raised sealing level. A volume flow of a drive jet can be controlled by the valve body actuator.

Abstract: A humidifier module is provided having a water vapor-permeable membrane having spacers defining a flow field arranged on either side of the membrane and having a yarn stitched into the membrane. The spacers defining the flow field are formed by the yarn stitched into the membrane. A humidifier, a method for making a humidifier module and a method for making a humidifier are also provided.