Descriptions for F04D and notes/indexes are displayed on this screen.
| F04D
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NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J 41/12; electrodynamic pumps H02K 44/02)
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Note(s)
This subclass covers non-positive-displacement pumps for liquids, for elastic fluids, or for liquids and elastic fluids whether rotary or not having pure rotation.This subclass does not cover combinations of non-positive-displacement pumps with other pumps, which are covered by subclass F04B, except that the use of such other pumps for priming or boosting non-positive-displacement is covered by this subclass.Attention is drawn to the Notes preceding class F01, especially as regards the definition of "pump".
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Subclass indexes
ROTARY PUMPS FOR LIQUID AND ELASTIC FLUID OR LIQUID ALONE | Kind of flow: radial or helico-centrifugal; axial; circumferential or transverse; other | 1/00; 3/00; 5/00; 11/00 | For handling specific fluids | 7/00 | Priming, preventing vapour lock | 9/00 | Pumping installations or systems; control | 13/00; 15/00 | ROTARY PUMPS FOR ELASTIC FLUID | Kind of flow: radial or helico-centrifugal; axial; other | 17/00; 19/00; 23/00 | Involving supersonic speed of fluid | 21/00 | Pumping installations; control | 25/00; 27/00 | DETAILS OR ACCESSORIES | 29/00 | OTHER KINDS OF PUMPS | Pumping liquid and elastic fluid at the same time | 31/00 | With other than pure rotation | 33/00 | Wave producers | 35/00 |
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