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Title: Vacuum Basics

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Subject: Technology
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Date: October 7, 1999
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Length: 6 / 1773
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Piston compressors have the disadvantage of the dead space which exists above the piston. This, plus leakage past the piston, limits the degree of vacuum that can be achieved. Better vacuum may be obtained with a rotary, oil sealed pump. This type of pump has a rotating off-center cylindrical rotor that "sweeps" air through the cylindrical housing in which the rotor is located...

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This type of pump has a rotating off-center cylindrical rotor that "sweeps" air through the cylindrical housing in which the rotor is located. Air is kept from passing from between the vacuum and pressure sides by means of either a set of two vanes which are arranged across the diameter of the rotor or by means of a sliding single vane mounted in the housing...

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