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| | 汽門是{{pll|Steam Overview|蒸汽機車}}上的控制裝置，與其他{{pll|Powertrains Overview|動力}}種類車輛上的{{pll|Throttle|油門}}功能相當。汽門用於調整自{{pll|Boiler|鍋爐}}注向「汽室」的{{pll|Steam Overview|蒸氣}}流量。再透過操作{{pll|Cutoff|逆轉機}}控制「汽室」蒸氣進入{{pll|Cylinder Cocks|汽缸}}的方向，進而驅動車輛。 |
| Using the regulator control device (equivalent to throttle in other motorized vehicle types), the driver sets the amount of steam being admitted from the boiler to the steam chest. Steam chest is an intermediary reservoir from where the steam finally reaches the vehicle's cylinders.
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| | 汽門不直接控制車輛加速，「汽室」中的壓力和逆轉機的設定才是車輛加速的主要因素。因此當汽門關閉，雖然蒸氣不再流向汽室，但直至當中壓力完全消耗前，車輛將持續加速。此可透過監控「汽室」壓力表進行操作。 |
| Based on the technology used, some vehicles may have early versions of superheaters that result in delay in response from the control device operation to the vehicle motion. Similarly, closing the regulator does not immediately stop admission of steam to the cylinders, but rather to the steam chest. Thus, the vehicle will not stop attempting to accelerate immediately, but only once the steam chest has depressurized.
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| | 汽門不僅是在關斷時可能會有動力延遲。要是車輛配備著較舊形式的過熱器，打開汽門時，蒸氣注入「汽室」的速度也會有所延遲。 |
| The steam in the chest is distributed alternately at both ends of the cylinders with every cycle. It pushes the pistons inside, which are mechanically connected to the driving wheels, thus propelling the vehicle. The used steam is then expelled through the blastpipe, where it mixes with smoke from the firebox in the smokebox, and together goes into the atmosphere through a chimney. The cycle repeats at every full rotation of the driving wheels.
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| {{See also|Cutoff|Throttle|Boiler}}
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| [[Category:Steam Drivetrain|1]] | | [[Category:Steam Drivetrain|1]] |
汽門是蒸汽機車 上的控制裝置，與其他動力 種類車輛上的油門 功能相當。汽門用於調整自鍋爐 注向「汽室」的蒸氣 流量。再透過操作逆轉機 控制「汽室」蒸氣進入汽缸 的方向，進而驅動車輛。
汽門不直接控制車輛加速，「汽室」中的壓力和逆轉機的設定才是車輛加速的主要因素。因此當汽門關閉，雖然蒸氣不再流向汽室，但直至當中壓力完全消耗前，車輛將持續加速。此可透過監控「汽室」壓力表進行操作。
汽門不僅是在關斷時可能會有動力延遲。要是車輛配備著較舊形式的過熱器，打開汽門時，蒸氣注入「汽室」的速度也會有所延遲。
