9, and vacuum unit: used two level pump configuration, by 1 Taiwan 2X-30 spin film type mechanical pump equipped with vacuum pressure poor valve (prevent vacuum pump oil for suddenly blackout and flooding), 1 Taiwan TK-200 convex cavity type spread pump equipped with cold trap (anti-oil steam into furnace cavity), and one a reference Germany Rai treasure company structure of filter device, and one φ 200 pneumatic high vacuum bezel valve, and 2 a φ 50 pneumatic vacuum butterfly valve, and one vacuum pressure table, and one inflatable valve, and one put valve, consists of, Pump and the vacuum piping system joins metal corrugated hose quick joint (slow vibrations), vacuum measurement is performed by complex vacuum meter with digital display.
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