at what pressure range does the technician valve off the vacuum pump when evacuating to a deep vacuum?

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16-11-2022
Physics

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at what pressure range does the technician valve off the vacuum pump when evacuating to a deep vacuum?

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smecloudbird18 smecloudbird18 · Answer 1 · 2022-11-22T08:45:11+01:00

When transferring a vacuum furnace chamber from atmospheric pressure to a supposedly "rough" vacuum, the roughing valve is utilized (typically in the range of 10 -2 to 10 -3 Torr).

This degree of vacuum is sometimes sufficient to carry out the targeted process. Another common name for vacuum is negative pressure (or soft vacuum). This happens when an application needs to keep track of both pressure increases and pressure drops in both directions above and below the atmosphere. The difference in pressure between the exhaust exit and input provides the basis for a vacuum.

We all know that water and air travel from high altitude to low altitude, and that a vacuum is produced by a difference in pressure between the two.

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