Gas feeding device for feeding a combustible gas mixture consisting of at least two components

In a gas mixture feeding device for feeding a combustible gas mixture consisting of at least two gas components into a combustion chamber of a thermal deburring installation for treating work pieces by means of temperature and pressure shocks formed by igniting the gas mixture, comprising a feeding line for each gas component, an adjustable dosaging device provided in each feeding line for the amount of gas and the mixing ratio of the gas components, the improvement comprising a control circuit for said dosaging device, said control circuit being adjustable to different mixing ratios and including a through-flow amount metering means (24 or 29) provided in each of the feeding lines (9, 10), a measuring value comparator (31), and said dosaging device including a valve (22 or 23) provided at least in one of the feeding lines and controlled by said measuring value comparator, and shut-off valves (35,25 or 30,36) provided in each feeding line between the flow amount metering means and the combustion chamber (2);

• and storage and counting means provided in one of said feeding lines, said shut-off valves reacting to a signal issued by said storage and counting means (34) which is connected to a respective flow amount metering means in accordance with a through flow of a preselectable amount of gas.