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。
Valve Disadvantages: the valve is prone to leakage around the stem, especially in-board leakage when a vacuum is pulled on the valve outlet.
阀门的缺点：当阀门排气口处是真空时，阀门在阀杆附近容易泄漏，特别是内部泄漏。
A vacuum adsorption nozzle is stuck on the center of the bottom surface of the metallic film of the flat plate, and a vacuum adsorption pipe is connected with an outlet of a vacuum adsorption device.
平板金属膜底面中央贴设有真空吸附管口，真空吸附管连接真空吸附装置的出口。
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