The anti-explosion fuel gas safety device has a U-shaped tube. One the left of the U-shaped tube, there is a spring and a pressure ball in a pressure ball cavity, and cylinder, which has one end capable of being communicated with outside and provided with isolating protection plate the other end provided with isolating piston capable of blocking the right end of the U-shaped tube. On the right of the U-shaped tube, there is a magnetic ball, which is normally floated in the middle part of magnetic ball cavity for shift up and down. In case that the outlet valve is damaged or exploded, the said device can block the U-shaped tube to avoid leakage of inlammable gas by means of its extending piston end, pressure ball and magnetic ball. |