| 摘要 |
PROBLEM TO BE SOLVED: To provide a small gas burner at a low cost without using a diaphragm. SOLUTION: A valve hole 62a is made on a cylindrical wall 62 demarcating a gas inlet chamber 60. The hole 62a has a slit form longitudinal in the axial direction communicating with a gas outlet chamber 61. A cylindrical valve element 63 for gas in the chamber 60 to flow is inserted freely axially slidably in the cylindrical wall 62, so that the valve hole 62a is partly overlapped with an opening 63a made on the peripheral wall of the valve element 63, and the valve opening is reduced, when the valve element is moved axially to one side. One end of the valve element 63 in the axial direction is closed, and a secondary gas pressure P2 in the chamber 61 is allowed to act on the external face of the closed end 63b, and then the valve element 63 is pushed axially in one direction by the differential pressure between the a primary gas pressure P1 in the chamber 60 acting on the internal surface of the closed end 63b and the secondary gas pressure P2. A spring member 67 is provided for biasing the valve element 63 axially to the other side, and the valve element 63 is made displaced to the position, where a pushing force produced by the differential pressure and an urging force of the spring balance with each other.
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