Multi-stage pumps

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Axial-flow pumps specially adapted for elastic fluids > Multi-stage pumps

CPC:

Axial-flow pumps (F04D21/00 takes precedence; ) > Multi-stage pumps

CPC subdivides this area 5x more granularly than IPC with 4 additional codes.

4 codes are CPC-only extensions.

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F04D 19/022 CPC only CPC only
F04D 19/024 CPC only CPC only
F04D 19/026 CPC only CPC only
F04D 19/028 CPC only CPC only
F04D 19/04 specially adapted to the production of a high vacuum, e.g. molecular pumps +4 CPC IPC+CPC Available in IPC and CPC