| 摘要 |
A valve 104 for a gas burner gas supply comprises a valve body 202 having a gas inlet 266, a main gas outlet 278 and a bore 212. The bore 212 has an interior surface 298 a part of which defines a gas flow cavity, the gas inlet 266 and the main gas outlet 268 being in communication with the gas flow cavity. The gas valve 104 further comprises a valve spindle 206 arranged to move into and out of the gas flow cavity, an exterior portion of the valve spindle forming a flow control surface 262 and defining a gap having a volume between the flow control surface 262 and the interior surface 298 of the gas flow cavity. Relative movement of the flow control surface 262 and the gas flow cavity varies the volume of the gap and regulates a flow of gas from the gas inlet 266 to the main gas outlet 268. The spindle flow control surface is preferably frusto-conical and moves axially along the longitudinal axis of the bore. The movement of the spindle is due to a liner motor 204. |
