| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size of constitution and to facilitate manufacture by minimizing pressure loss at the time of a maximum quantity of flow and shortening the interval of a full open state of a valve body in which the valve body is separated from a valve seat. SOLUTION: The gas channel of a gas meter main body is provided with a pressure fluctuation removing means 37 along the passage of gas and a fluidics flowmeter in this order. One end part 112 of a connecting rod 70 is rockably mounted to a valve body 42, which can be seated on a valve seat 82, and the other end part is connected to a diaphragm 43. The diaphragm 43 brings the valve body 42 close to the valve seat 82 as the differential pressure between pressure upstream from a valve hole 41 and pressure on the side of a discharge opening of gas is reduced. The full open location of the valve body 42 in which the valve body 42 is in contact with a contact piece 96 is selected at a location at which pressure loss is hardly changed even if the full open location is changed due to the tolerance of size of each constituent element.
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