The invention LPG, is connected to a pipe for supplying the LNG gas cock related to the fuse to open and close the flow path and, body 10, piston 22 and the washer 33 as main components. Body 10 shall have the snap ring 11 and the button 12 in the permanent magnet closed space (13). Piston 22 is provided with a blocking plate (21) for intermittent passage of the moving body 10, the body 10 and the button 12 is installed to the moving direction on the shaft. Washer 33 is under spring force in one direction by the spring 32 on the one side, and is fixed to the button 12 by the permanent magnet 13 and the relative movement enables the fastening bolt 31 of the piston 22. ; Accordingly, the present invention is a departure or a full opening of the gas mass flow as a button with preventing the leakage of gas due to the cutting, etc. with a single touch of a hose pipe so as any place, it is possible to suppress the effect of the operation of a deliberate leak gas to prevent explosion accidents.
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