無油活塞真空泵工作原理 A connecting rod with a compression ring rises and falls In the cylinder ,On the down-stroke it draws the air through the inlet valve; On the up-stroke it forces the air through the exhaust valve and out of the head WIGGENS C系列 防腐蝕隔膜真空泵 WIGGENS R-12SN 旋片式油封真空泵 WIGGENS V300 無油柱塞泵 Wiggens CSC系列 防腐蝕溶劑回收真空泵 Wiggens BioFlo PRO蠕動泵