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    • 5. 发明专利
    • CONTROL MEANS FOR CONTROLLING FLUID PRESSURE
    • GB1531383A
    • 1978-11-08
    • GB1147777
    • 1977-03-17
    • ESAB KEBE GMBH
    • B23K7/10F23N5/20
    • 1531383 Controlling burners ESAB-KEBE GmbH 17 March 1977 [20 March 1976] 11477/77 Heading F4T Apparatus for controlling the flow of fluid in a pipe 14, for example the supply of cutting oxygen to oxy-acetylene cutting burners 8, comprises an ON/OFF valve 24 in the pipe and at least two pipes 10, 12 connected in parallel with the valve 24 and containing respective ON/OFF valves 20, 22, the valves 20, 22, 24 being controlled by a timing device 34 and the flow sections of the pipes 10, 12, 14 being different. These different flow sections are provided by throttles 26, 28, preferably upstream of the valves 20, 22. The valves are electromagnetically operated. For carrying out hole punching the timing device 34 causes the valves 20, 22, 24 to be successively opened at predetermined intervals, giving three distinct supply rates. When all the valves are closed the downstream pressure is vented through a passage 36 provided in the valve 20.