To eliminate the occurrence of operational failure by high temperature oxidation, burning damage and carbon.
A hanging bell-shaped valve body 32 for closing a valve receiving seat part 23, is arranged in a valve hole 31 formed between the valve receiving seat part 23 and a regulating step part 24, a coil spring 25 is arranged for biasing the valve body 32 in the closing direction by abutting on the valve seat receiving part 23, an upper flange 37U is arranged on the upstream end of a body part 35 of the valve body 32, a lower flange 37D is formed on the downstream end, a gas passing part 38 of the upper flange 37U, communicating holes 36 of the body part 35 and a hollow part 33 are formed for sending out ignition fuel gas, four sliding contact guide surfaces 41 of the constant area slidingly contacted with the valve hole 31, are formed in an outer peripheral part of the lower flange 37D with every 90°, and the total area of these sliding contact guide surfaces 41 is set to 10-30% to the area of an inner peripheral surface of the valve hole 31 corresponding to the outer periphery of the lower flange 37D.
FUJIKAWA TAKAHIRO
EGUCHI TOMOTAKA
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