Fuel gas blocking device doubling as flow passage

A fuel gas blocking device, comprising:

• a supply body part having a flow passage formed therein to supply a fuel gas and provided with a supply port having a sealing step formed therein on one side thereof;
• a solenoid body of which a front end is hermetically fastened to the supply port and a rear end extends rearward such that a coil part is provided on an outer side thereof, and in which a hollow is formed in a longitudinal direction, and a flow passage cover in which a first flow passage is formed in the longitudinal direction is provided at a rear end of the hollow;
• a flow passage plunger inserted into a front end of the hollow, selectively moving rearward when power is supplied to the coil part, and having a second flow passage formed therein in the longitudinal direction;
• a spring provided between the flow passage cover and the flow passage plunger and configured to provide an elastic restoring force in a direction in which the flow passage plunger moves forward;
• a gap poppet part provided at a front end of the flow passage plunger and configured to selectively seal the sealing step when moving forward;
• an auxiliary poppet protruding from the front end of the flow passage plunger;
• and,
• a stopping pin fixedly protruding from an outer surface of the front end of the flow passage plunger,
• wherein the stopping pin is stopped by and coupled to a gap groove formed in an inner circumference of the gap poppet part, the gap groove having a preset gap distance in a front-rear direction,
• wherein the preset gap distance of the gap groove is greater than a thickness of the stopping pin in the front-rear direction, thereby the stopping pin being movable within the gap groove in the front-rear direction,
• wherein a differential pressure adjustment hole is formed at a center of the gap poppet part,
• wherein the auxiliary poppet is configured to selectively seal the differential pressure adjustment hole,
• wherein the flow passage plunger is formed as a single integrated body and has a radiation flow passage extended from a front end of the second flow passage of the flow passage plunger in radial direction, and
• wherein spring steps between which the spring is interposed are formed at a front end of the flow passage cover and a rear end of the flow passage plunger.