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The roughing pump is the component that primes the other pumps in series on the vacuum line, evacuating the system until a pressure level is reached at which a booster pump (known as a lobe-type roots pump) can be activated, followed by other types of diffusion, turbo molecular, cryogenic, ionic andRead more
The roughing pump is the component that primes the other pumps in series on the vacuum line, evacuating the system until a pressure level is reached at which a booster pump (known as a lobe-type roots pump) can be activated, followed by other types of diffusion, turbo molecular, cryogenic, ionic and other pumps that can be used when the pressure is reached.
Depending on the flow rate, the pumping system is proportioned in relation to system volume, pumping cycle speed, load degassing and contamination produced by the load (vapors, dust, binders, etc.) in the pump itself. It is for this reason that mechanical strength and wear influence the choice of pump type.
I highly recommend you to read an intersting article (splitted in two parts) about this topic:
Roughing pump in high-vacuum furnaces for beginners [1/2]
Roughing pump in high-vacuum furnaces for beginners [2/2]
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