| 摘要 |
PURPOSE:To improve durability and reliability of a flapper valve device by a method wherein pressure caused by reversed combustion is dampened by an aerodynamic valve and a shock against the flapper valve device is avoided. CONSTITUTION:Each of aerodynamic valves 9 and 9 has a large pressure loss against reverse flow of fluid flowing from outlet ports 13 and 13, so that returning combustion gas and pressure shock are dampened in a cylindrical chamber 11 and trapper valves 14 and 14 in each of the flapper valves 18 and 18 is closed by the dampened shock. In this case, the reverse flowing combustion gas is reduced by pressure loss of the aerodynamic valves 9 and 9, so that thermal effect of the combustion heat against the flapper valves 18 and 18 is restricted and at the same time reverse gas flow can completely be prevented.
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