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

|  | F01 - F04 |
Subsection index
MACHINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F04C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F04B
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
ENGINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F03C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F03C
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
PUMPS |
positive displacement |
rotary or oscillating piston | F04C
reciprocating piston or other | F04B
non-positive displacement | F04D

LIGHTING; HEATING

|  | F22 |
STEAM GENERATION (chemical or physical apparatus for generating gases Fulltext... Hierarchy... Expanded...B01J; chemical generation of gas, e.g. under pressure, Section C; removal of combustion products or residues, e.g. cleaning of the combustion contaminated surfaces of tubes of boilers, Fulltext... Hierarchy... Expanded...F23J; generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...F23R; water heaters not for steam generation Fulltext... Hierarchy... Expanded...F24H, Fulltext... Hierarchy... Expanded...F28; cleaning of internal or external surfaces of heat-transfer conduits, e.g. water tubes of boilers, Fulltext... Hierarchy... Expanded...F28G)

|  | F22 |
Note(s) In this class, the following term is used with the meaning indicated: "steam" covers also other condensable vapours, e.g. mercury, diphenyl, diphenyl oxide.

|  | F22D |
PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; FEED-WATER SUPPLY; CONTROLLING WATER LEVEL; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN BOILERS (chemical treatment of water, e.g. purification, Fulltext... Hierarchy... Expanded...C02F; enclosed heat-exchange apparatus in general Fulltext... Hierarchy... Expanded...F28D; controlling in general Fulltext... Hierarchy... Expanded...G05)

P:10 |  | F22D 1/00 |
Feed-water heaters, e.g. preheaters

P:20 |  | F22D 3/00 |
Accumulators for preheated water

P:0 |  | F22D 5/00 |
Controlling water feed or water level; Automatic water feeding or water-level regulators (steam traps Fulltext... Hierarchy... Expanded...F16T; measuring or indicating instruments Fulltext... Hierarchy... Expanded...G01; for indicating water level Fulltext... Hierarchy... Expanded...G01F; level control in general Fulltext... Hierarchy... Expanded...G05D 9/00)

P:40 |  | F22D 7/00 |
Auxiliary devices for promoting water circulation (adaptation of boilers for promoting water circulation Fulltext... Hierarchy... Expanded...F22B 37/00)

P:30 |  | F22D 11/00 |
Feed-water supply not provided for in other main groups