When using jet suction cutting torch, the suction force of cutting torch should be checked before installing acetylene rubber pipe. The method is to connect only the oxygen rubber pipe, open the acetylene valve and oxygen valve on the cutting torch, and place the finger at the acetylene intake of the cutting torch. If the suction is felt, the suction is good. Then check the acetylene hose whether there is normal outflow of acetylene gas in China. Then put the acetylene hose on the cutting torch



2 Before the torch is ignited, check the connection and whether the air valves are leaking.



3. When both oxygen and acetylene valves are opened, it is forbidden to block the cutting nozzle with hands or other objects, so as to avoid backflow of oxygen into the acetylene supply system causing tempering.



4. Turn on acetylene before ignition, then turn on oxygen valve to regulate flame. In this way, once a sign of tempering is found, the oxygen valve can be closed immediately and the fire can be extinguished. The disadvantage is that the flame produces soot at the beginning. Black smoke can be avoided if the oxygen valve is slightly opened first, then the acetylene valve is opened and ignited. But in the case of jet-suction cutting torch, if the cutting torch leaks or the end of the cutting nozzle is blocked, tempering is easy to occur.



When igniting, the cutting torch should be deviated to the outside so as not to damage the body by flame after ignition. When igniting, special ignition gun or ignition rope should be used instead of cigarette butt. When using the jet-suction torch, the hand should be held on the bakelite handle, not on the mixing pipe, so as not to burn the hand once tempered.



6. Do not place lighted torches on workpieces or on the ground at will.



Once tempering occurs, the gas valve should be closed immediately and the oxygen valve should be closed again. After the tempering is stopped, the pressure reducer is loosened and the reason of tempering is found out before the ignition can be re-ignited. Before ignition, the soot in the mixing chamber of rubber hose and cutting torch should be blown off, and the cutting torch should be cooled in water.



When the flame is extinguished at the end of cutting, the jet-suction cutting torch should first concern about oxygen cutting, then turn off the gas valve, and finally turn off the preheated oxygen valve. Isobaric torch can concern about oxygen cutting first, then turn off the preheating oxygen valve.



9 When the torch is not in use for the time being, it should not be placed in the tunnel, trench or under the workpiece or locked in the toolbox, so as not to leak acetylene from the valve tightly, accumulate gas-air mixture in these spaces, and explode when encountering Mars.



10 At the end of each day's work, the decompressor and torch should be removed and the valves such as cylinders and air passages should be closed.