Patent ID: 8720469

Claim:
A safety shut-off device for a liquid gas system having at least one gas consumer for a vehicle and/or vehicle trailer for avoiding an unwanted release of gas, the device comprising: a) an electromagnetic gas valve for shutting off a gas supply to the liquid gas system; b) a flow sensor for periodically detecting a current gas flow F a being discharged from a gas source; c) an evaluation unit that, for each time a current gas flow F a is detected by the flow sensor, compares the current gas flow F a to a previous gas flow F v ; and d) an electronic unit which controls the electromagnetic gas valve for shutting off the gas supply when the evaluation unit detects a current gas flow F a which differs from the previous gas flow F v by more than a maximum admissible change rate Δ max , further comprising an accident sensor in active communication with the evaluation unit and/or the electronic unit for detecting an accident befalling the vehicle and/or vehicle trailer, wherein the electronic unit controls the electromagnetic gas valve for shutting off the gas supply when notified by the accident sensor of the accident.