| 摘要 |
In a liquid fuel burner of the spill return type, comprising a rotary change-over valve for conditioning the burner into a "circulate" mode in which no fuel is discharged from the burner and a "fire" mode in which liquid fuel issues from the burner, the rotary change-over valve is adjustable into a plurality of different positions providing different rates of discharge of fuel from the burner when the latter is conditioned into its "fire" mode. |
