控制阀是安装在压缩机外部调节压缩机容量处，控制压缩机最大值和极小值之间的量。

Installed on externally capacity-adjustable compressors, the regulating valves control the compressor capacity between the maximum and the minimum.

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所述 节流单元包括影响流动截面的节流元件（5），该节流元件（5）可通过手柄（17） 从外部调节。

Said throttle unit comprises a throttle element (5) influencing a cross-section of flow and can be adjusted from outside by means of an actuator (17).

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并不是所有时间都需要运行它，因为我通过外部喇叭来调节音量。

Doesn't need to be running all the time, as I adjust volume via external speakers.

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