| 摘要 |
A burner assembly comprising a burner element (8) at which gas is combusted. A valve (2) allows selective release of gas from a source into an expandable space (4) when the valve is opened. The space is expanadable up to a fixed volume (3) against the action of a restoring means. The space is arranged to contract under the action of the restoring means to force gas out of the space and to the burner element. |
