Abstract: A fluid control device includes a housing portion including an inlet port and an outlet port, and a valve portion fixedly coupled to an internal surface of the housing portion, in which the valve portion includes a lower plunger module, an upper plunger module, an elastic member including one side configured to press the lower plunger module downward and the other side configured to press the upper plunger module upward, and a solenoid, in which the lower plunger module includes a lower plunger member movable in an upward/downward direction H, and in which the upper plunger module includes an upper plunger member provided to be movable in the upward/downward direction H relative to the housing portion, and a core provided to be penetrated by a partial region of the upper plunger member and including at least a partial region surrounded by the solenoid.

Abstract: A nozzle assembly includes a first nozzle device that provides a fluid passage, in which a fluid flows, and a second nozzle device that surrounds the first nozzle device, and when an imaginary straight line passing through the fluid passage and extending in a direction, in which the fluid flows, is defined as a reference straight line, the first nozzle device includes a spacing area having a shape that is recessed in a direction that faces the reference straight line to be spaced apart from a portion of the second nozzle device. The nozzle assembly may be fixed to a body of a vehicle as part of an ejector for ejecting fluid having a pressure to a targeted location such as a hydrogen fuel cell of the vehicle.

Abstract: A fuel cell system includes: a supply flow path configured to supply reactant gas; a first branch flow path branching off from an outlet end of the supply flow path and configured to guide the reactant gas to a first fuel cell stack; a second branch flow path branching off from the outlet end of the supply flow path and configured to communicate with the first branch flow path and guide the reactant gas to a second fuel cell stack; and an inlet area change part disposed in a boundary zone between the first branch flow path and the second branch flow path and configured to selectively change inlet areas of the first and second branch flow paths. Efficiency in discharging condensate water is increased and performance and operational efficiency are improved.