A vacuum pump is simply a pump that moves air into or out of something else. Sometimes it removes gas from an area, leaving a partial vacuum behind. A vacuum pumps rating is the maximum vacuum level for which it is recommended. The rating is expressed as Inches Hg and is specified for either continuous or intermittent duty cycles.
There are various types of vacuum pumps: Dry Vacuum pumps operate without fluids, such as steam or water, eliminating environmental worries and the cost of contaminant disposal. Dry vacuum pumps, which can be configured to operate either hot or cool depending on the application, reduce emissions and ease solvent recovery. Liquid ring vacuum pumps, used in many industries for the evacuation of both dry and wet gases, have the capability to deal with condensable vapors or even small slugs of liquid entrained in the incoming gas. The liquid ring pump compresses gas by rotating a vaned impeller located eccentrically within a cylindrical casing. Liquid (usually water) is fed into the pump and, by centrifugal acceleration, forms a moving cylindrical ring against the inside of the casing. This liquid ring creates a series of seals in the space between the impeller vanes, which form compression chambers. The eccentricity between the impeller's axis of rotation and the casing geometric axis results in a cyclic variation of the volume enclosed by the vanes and the ring. Rotary Vane vacuum pumps are oil-sealed, air-cooled, direct-drive pumps with a small footprint that are used for pumping clean, dry, non-reactive gases. With regular oil and vane/filter changes, the reliability of rotary vane vacuum pumps, as far as maintaining maximum up-time, is moderate.
Major Vacuum Pump manufacturers are: Busch, Nash, Kinney, SIHI, Stokes, Rietschle, Dekker,Tuthill, Wintek, Leybold
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