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“Vacuum” can be described as a negative pressure (one that is lower than atmospheric pressure). It is commonly measured in inches of Mercury (in. Hg) instead of pounds per square inch (PSI), which is used to measure positive pressure. Where we define positive pressure as some number of PSI above atmospheric pressure, we define vacuum as some number of inches of Mercury below atmospheric pressure. Where the vacuum is only slightly below atmospheric pressure, units of inches of Water are sometimes used to express the vacuum level.
For high vacuum applications a different point of reference is used. Torr, or millimeters of Mercury, is referenced to a perfect vacuum (no air whatsoever). A perfect vacuum is 0 Torr, and atmospheric pressure is 760 Torr.
Various levels of vacuum are used for various tasks. These include holding objects onto a surface, forcing materials into molds, removing unwanted gases from materials, moving bulk materials through pipes (for both medical and industrial applications), drying materials, and removing air from packaging and processes where the presence of oxygen is detrimental.
Selecting a vacuum pump is a little more involved than selecting an air compressor. With air compressors we know what we’re working with: atmospheric air. With vacuum pumps we’re often working with air that has something else mixed in with it, and we have to be concerned about any effects this other material will have on the vacuum pump and the surrounding area to which the air is exhausted.
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Recirculated Oil Type Rotary Vane Vacuum Pump
This type of lubricated rotary vane vacuum pump is intended for general industrial use where oil can be tolerated. Cal Supply's recirculated oil type pumps are reguarded as highly reliable while requiring minimal maintenance.
HP Range: 0.6 - 50
In. Hg: 29.9
Dry Running Non-Lubricated Rotary Vane Vacuum Pump
Cal's non-lubricated rotary vane vacuum pump is intended for general industrial use where oil cannot be tolerated. While also highly reliable dry running non-lubricated rotary vane vacuum pumps require a higher level of maintenance than the lubricated types.
HP Range: 1.2 - 15
In. Hg: 25.5
Once-Through Oil Lubricated Rotary Vane Vacuum Pump
In rounding out our rotary vane vacuum pump line Cal Supply offers the Once-Through Oil Lubricated Vacuum Pump designed for process and chemical applications where gases or vapors can't be allowed to accumulate with in the vacuum pump.
HP Range: 0.75 - 50
In. Hg: 29.9
Single Stage Regenerative Blowers
HP Range: 5 - 30
Torr: 498
In. Hg: 10.3
In. WG: 140
HP Range: 5 - 18
In. Hg: 13.3
In. WG: 180
HP Range: 10 - 25
In. Hg: 24
In. WG: 326
HP Range: 2 - 15
In. Hg: 26
In. WG: 354
HP Range: 5 - 75
HP Range: 3 - 17.5
In. Hg: 2.9
In. WG: 40
HP Range: 3 - 10
In. Hg: 15
In. WG: 204
HP Range: 5 - 25
In. Hg: 28.9