FLUIDIC TYPE GAS METER

摘要

PROBLEM TO BE SOLVED: To allow an adequate value of the pressure loss at a low flow rate to be set and enough reduce the pressure loss at a high flow rate. SOLUTION: A gas passage of a gas meter body comprises means 37 for eliminating the pressure variation and a fluidic flow meter in this order along the flow of a gas. In the pressure variation eliminating means 37, a valve element 42 connected to a diaphragm 43 through a connecting rod has a bottom- closed tube 131 insertable in a valve hole 41 and an annular protrusion 132 which is provided on the tube 131 and contactable to a valve seat 82. The gap d1 between the inner diameter Wv of the valve hole 41 and the outer diameter Wp of the tube 131 of the valve element 42 is selected adequately and the length Tp of the tube 131 and the length Tv of the valve hole are also adequately selected to rapidly lower the pressure loss at a flow rate Q2 (1200-2500 L/h) and enough reduce the pressure loss over the flow rate Q2.