活塞主要因进气歧管真空度的变化而在活塞腔内上下移动。
The piston moves up and down in the piston chamber primarily in response to changes in intake manifold vacuum.
这是因为当发动机熄火时，进气歧管冷却而产生轻微的真空。
When the engine is shut off, the intake manifold cools and a slight vacuum forms as a result .
位于真空歧管上的真空释放阀，用于在供料轮上的预定排出位置从袋子向空腔内排出颗粒材料；
A downstream vacuum relief (48) on the vacuum manifold functions to discharge particulate material from the pockets into the cavities at a predetermined discharge location on the wheel.
位于真空歧管上的真空释放阀，用于在供料轮上的预定排出位置从袋子向空腔内排出颗粒材料；
A downstream vacuum relief (48) on the vacuum manifold functions to discharge particulate material from the pockets into the cavities at a predetermined discharge location on the wheel.
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