When using oxygen gas pipes 3, situations can arise in particular due to slag return and similar hazards where the operating employee has to initiate safety measures. Slag return safety devices are known which, in such a case, ensure that the gas flow is stopped by melting a cap 35 of a heat sensor 5. The response of this outlet valve 6 of the slag backflow prevention device can be recognized, for example, by the fact that the inlet pressure of the oxygen gas 4 is used to push pins 21 located in the wall 19 of the oxygen gas pipe 3 beyond the outside 27 of the oxygen gas pipe 3 so that they cannot be overlooked as a warning signal are. The movement of the pins 21 can be used to address further signal systems 30 in order to additionally indicate this movement optically and / or acoustically.
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