The engine, as it cooled itself, sucked in air through the outlet hose, producing suction in the vacuum chamber, and so drawing the plunger down and compressing the spring.
当引擎冷却时，通过出口软管吸入空气，在真空管产生吸气，导致柱塞向下挤压弹簧。
2
It was a small vacuum chamber, about the size and shape of a bathtub stopper, that contained a plunger and spring, and had two small air hoses attached to it.
它是一款非常小巧的真空管，形状和大小如浴缸塞，内含一个柱塞和弹簧，由两个小型空气软管连接。
3
With its triple balanced range spring construction it holds a vacuum setpoint with the precision you need for tough applications.