Fuel-using system comprising electromagnetic force adjusting unit

A fuel-using system comprising:

• a fuel-using equipment which uses fuel gas;
• a fuel supply source which supplies fuel gas to the fuel-using equipment;
• a gas supply path which connects the fuel supply source with the fuel-using equipment;
• an electromagnetic shutoff valve which is provided in the fuel supply source or a part adjacent to the fuel supply source of the gas supply path, and is opened by an electromagnetic force of a solenoid with energization of a valve body in a valve-closing direction by an energizing unit, wherein the electromagnetic shutoff valve comprises a main valve body located above a main valve seat, and a discharge path which leads into the gas supply path, and wherein the discharge path is configured to receive fuel from the fuel supply source that flows around the main valve body, through the main valve seat, and into the discharge path;
• a pressure reducing valve which is provided on the downstream side of the shutoff valve and reduces a pressure of the fuel gas passed through the shutoff valve from the fuel supply source;
• an use gas flow rate detecting unit which detects a flow rate of the fuel gas relating to use of the fuel-using equipment;
• a gas pressure detecting unit which detects a pressure of the fuel gas on the upstream side of the pressure reducing valve;
• and
• an electromagnetic force adjusting unit which sequentially sets the electromagnetic force of the solenoid of the shutoff valve so that a valve-opening amount is such an amount as to supply a use gas flow rate to the fuel-using equipment based on detection values of the use gas flow rate detecting unit and the gas pressure detecting unit.