EARTHQUAKEEPROOF AUTOMATIC FIRE EXTINGUISHING DEVICE FOR GAS

摘要

PURPOSE:To shut off gas supply surely when an earthquake occurs by a method wherein attraction of a magnet integral with a valve body to a fixed substance is released and the valve body is constituted so as to close a valve instantaneously when the earthquake larger than a specified seismic magnitude occurs. CONSTITUTION:A magnet 1, provided at a lower end of a valve section equipped with a valve body 5 integrally, is attracted against a spring 3 to a spherical surface 2, as a fixed substance at a bottom portion of a main body of an automatic fire extinguishing device, to permit the flow of gas flowed from a port A to a port B. When an earthquake occurs under this usual service condition, the attracting manner of the magnet becomes unstable and simultaneously the valve section is moved upwardly by the spring 3 to close a flow path of the gas with the valve body 5. Thereafter, when the device is desired to be reset to the usual service condition, a push-button 6 is pushed down against a spring 7 and the valve section is lowered to attract the spherical surface 2 to the magnet 1.