| 摘要 |
PURPOSE:To detect accurately the gas flow rate independently of the kind of gas, by providing a throttle mechanism having a variable passing area of the gas in accordance with the kind of gas on the downstream of a proportional control valve and moreover, providing a gas jetting nozzle on its further downstream. CONSTITUTION:A gas G is driven by an electric current i and is passed through a gas proportional control valve PV controlling the gas flow rate. Moreover, said gas is passed through a throttle mechanism R which is capable of varying passing area of the gas in accordance with the kind of the gas and is supplied to a burner B through a nozzle N. Further, a body 1 of the mechanism R is provided with an exit 3 to the valve PV and a throttle plate 4 having a throttle opening 4a in its gas flow passage is attached freely attachably and detachably by a screw 5 and moreover, a cover 6 sealing the gas from the outside is attached freely attachably and detachably by an O-ring 7 and a screw 8. Hereby, the gas flow rate is detected accurately independently of the kind of the gas. |
