|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

ENGINES AND PUMPS

|  | F04 |
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS (charging or scavenging combustion engines by pumps Fulltext... Hierarchy... Expanded...F02B; engine fuel-injection pumps Fulltext... Hierarchy... Expanded...F02M; electric discharge pumps Fulltext... Hierarchy... Expanded...H01J 41/00; pumping by electrodynamic action Fulltext... Hierarchy... Expanded...H02N 4/20)

|  | F04 |
Note(s) Combinations of positive-displacement and non-positive-displacement pumps are to be found in the following sub-classes: Fulltext... Hierarchy... Expanded...F04B as a general sub-class for pumps; Fulltext... Hierarchy... Expanded...F04C, D in respect of matter peculiar to these sub-classes.

|  | F04F |
PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS

|  | F04F |
Note(s) Attention is drawn to the notes preceding class Fulltext... Hierarchy... Expanded...F01. Combinations of pumps belonging to this sub-class with other pumps are only classified in this sub-class if such other pumps are fore pumps of diffusion pumps.

|  | F04F 1/00 |
Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped (using only negative pressure Fulltext... Hierarchy... Expanded...F04F 3/00; jet pumps Fulltext... Hierarchy... Expanded...F04F 5/00; siphons Fulltext... Hierarchy... Expanded...F04F 10/00)

|  | F04F 1/02 |
· | using both positively and negatively pressurised fluid medium, e.g. alternating

|  | F04F 1/04 |
· · | generated by vaporising and condensing

|  | F04F 1/06 |
· | the fluid medium acting on the surface of the liquid to be pumped (Fulltext... Hierarchy... Expanded...F04F 1/02 takes precedence)

|  | F04F 1/08 |
· · | specially adapted for raising liquids from great depths, e.g. in wells

|  | F04F 1/10 |
· · | of multiple type, e.g. with two or more units in parallel (Fulltext... Hierarchy... Expanded...F04F 1/08 takes precedence)

|  | F04F 1/12 |
· · · | in series

|  | F04F 1/14 |
· · | adapted to pump specific liquids, e.g. corrosive or hot liquids

|  | F04F 1/16 |
· · | characterised by the fluid medium being suddenly pressurised, e.g. by explosion

|  | F04F 1/18 |
· | the fluid medium being mixed with, or generated from, the liquid to be pumped

|  | F04F 1/20 |
· · | specially adapted for raising liquids from great depths, e.g. in wells

|  | F04F 3/00 |
Pumps using negative pressure acting directly on the liquid to be pumped (siphons Fulltext... Hierarchy... Expanded...F04F 10/00)

|  | F04F 5/00 |
Jet pumps, i.e. devices in which fluid flow is induced by pressure drop caused by velocity of another fluid flow (diffusion pumps Fulltext... Hierarchy... Expanded...F04F 9/00; combination of jet pumps with pumps of other than jet type Fulltext... Hierarchy... Expanded...F04B; use of jet pumps for priming or boosting non-positive-displacement pumps Fulltext... Hierarchy... Expanded...F04D)

|  | F04F 5/02 |
· | the inducing fluid being liquid

|  | F04F 5/04 |
· · | displacing elastic fluids

|  | F04F 5/06 |
· · · | of rotary type

|  | F04F 5/08 |
· · · | the elastic fluid being entrained in a free-falling column of liquid

|  | F04F 5/10 |
· · | displacing liquids, e.g. containing solids, or liquids and elastic fluids

|  | F04F 5/12 |
· · · | of multi-stage type

|  | F04F 5/14 |
· | the inducing fluid being elastic fluid

|  | F04F 5/16 |
· · | displacing elastic fluids

|  | F04F 5/18 |
· · · | for compressing

|  | F04F 5/20 |
· · · | for evacuating

|  | F04F 5/22 |
· · · · | of multi-stage type

|  | F04F 5/24 |
· · | displacing liquids, e.g. containing solids, or liquids and elastic fluids

|  | F04F 5/26 |
· · · | of multi-stage type (Fulltext... Hierarchy... Expanded...F04F 5/28 takes precedence)

|  | F04F 5/28 |
· · · | Restarting of inducing action

|  | F04F 5/30 |
· · · · | with axially-slidable combining nozzle

|  | F04F 5/32 |
· · · · | with hinged flap in combining nozzle

|  | F04F 5/34 |
· · | characterised by means for changing inducing-fluid source

|  | F04F 5/36 |
· · | characterised by using specific inducing fluid

|  | F04F 5/38 |
· · · | the inducing fluid being mercury vapour

|  | F04F 5/40 |
· · · | the inducing fluid being oil vapour

|  | F04F 5/42 |
· | characterised by the input flow of inducing fluid medium being radial or tangential to output flow (cyclones Fulltext... Hierarchy... Expanded...B04C)

|  | F04F 5/44 |
· | Component parts, details, or accessories not provided for in, or of interest apart from, groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F04F 5/02-F04F 5/42

|  | F04F 5/46 |
· · | Arrangements of nozzles

|  | F04F 5/48 |
· · | Control

|  | F04F 5/50 |
· · · | of compressing pumps

|  | F04F 5/52 |
· · · | of evacuating pumps

|  | F04F 5/54 |
· | Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different type

|  | F04F 7/00 |
Pumps displacing fluids by using inertia thereof, e.g. by generating vibrations therein

|  | F04F 7/02 |
· | Hydraulic rams

|  | F04F 9/00 |
Diffusion pumps

|  | F04F 9/02 |
· | of multi-stage type

|  | F04F 9/04 |
· | in combination with fore pumps, e.g. use of isolating valves

|  | F04F 9/06 |
· | Arrangement of vapour traps

|  | F04F 9/08 |
· | Control

|  | F04F 10/00 |
Siphons

|  | F04F 10/02 |
· | Gravity-actuated siphons

|  | F04F 11/00 |
Other pumps (evacuating by sorption Fulltext... Hierarchy... Expanded...F04B)