PURPOSE: To provide a gas leak detection device capable of supplying gas without causing large pressure loss, supplying the gas to only a sub-supplying path when a gas flow rate is small to detect gas leak, simply dealing with existing equipment, and inhibiting the detraction of valve-closing even when refuse is mixed; and realizing miniaturization, a low cost, and lightening.
CONSTITUTION: A nozzle 26 as a main supply path switching means, and a valve element 41 are provided on a main supply pipe 5 half way, and the valve element 41 is fitted to a valve shaft 42. A valve element driving means is composed of a diaphragm 32, a connecting metal fitting 32d, an elastic member 36, links 47a-47c, and the valve shaft 42. When a gas flow rate is small, the diaphragm 32 is elevated by the elastic member 36, to move the shaft 42 by the links to push the valve element 41, thereby making the nozzle 26 into a valve-closed condition; when a gas flow rate is large, the diaphragm 32 is lowered by gas pressure in a passage 28 to valve-open the nozzle 26. Since the nozzle 26 is provided in a lateral direction, the adhesion of refuse and the detecting of a valve-closed condition are eliminated.
| JP2011169600 | WATER METER INSTALLATION UNIT |
| JP4449424 | Gas shutoff device |
| JP3963745 | GAS CONSUMPTION ESTIMATING METHOD AND SYSTEM |
SUYAMA KIICHI
IKADA TAKAOMI
KEGASA AKISHI
ANDO JUNICHI
NAKAMURA MUTSUMI
OSAKA GAS CO LTD
TOHO GAS KK
YAZAKI CORP
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