Pressure regulating valve, fuel cell system using same, and hydrogen generating facility

A fuel cell system comprising an anode chamber to be supplied with a fuel under control of a pressure regulating valve, the pressure regulating valve including

• a first pressure deformation portion which is deformable and which receives a pressure on a fuel demand side,
• a second pressure deformation portion opposed to the first pressure deformation portion and which is deformable and which receives a predetermined pressure,
• a first flow passage, a second flow passage, and a communication passage for allowing the first and second flow passages to communicate with each other, the first flow passage, the second flow passage, and the communication passage being disposed in a space between the first and second pressure deformation portions, and
• a valve member having a connecting portion which extends through the communication passage and connects the first pressure deformation portion and the second pressure deformation portion together, and having a valve element which is provided at the connecting portion and closes the communication passage when moved toward the second pressure deformation portion,
• wherein one of the first and second flow passages communicates with a fuel fluid supply source for supplying a fuel fluid comprising the fuel or a fuel generating material, and the other of the first and second flow passages communicates with a flow passage communicating with the fuel demand side, and
• wherein when the pressure on the fuel demand side is lower than a predetermined value, the valve element does not close the communication passage, and the fuel fluid comprising the fuel or the fuel generating material is supplied to the flow passage communicating with the fuel demand side, but when the pressure on the fuel demand side is equal to or higher than the predetermined value, the valve element closes the communication passage to stop a flow of the fuel fluid.