|  | 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

|  | F23 |
COMBUSTION APPARATUS; COMBUSTION PROCESSES

|  | F23 |
Note(s) In this class, the following terms or expressions are used with the meanings indicated: "combustion" means the direct combination of oxygen gas, e.g. in air, and a burnable substance. Any other heat-producing combination of chemical substances, e.g. hydrogen peroxide and methane, iron oxide and aluminium, is covered by section C or by subclass Fulltext... Hierarchy... Expanded...F24J; "combustion chamber" means a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame; "burner" means a device by which fluent fuel is passed to a combustion space where it burns to produce a self-supporting flame; "air" means a mixture of gases containing free oxygen and able to promote or support combustion.

|  | F23N |
REGULATING OR CONTROLLING COMBUSTION (control devices specially adapted for combustion apparatus in which combustion takes place in a fluidised bed of fuel or other particles Fulltext... Hierarchy... Expanded...F23C 10/00; condition responsive controls for regulating combustion in domestic stoves with open fires for solid fuel Fulltext... Hierarchy... Expanded...F24B 1/00)

P:0 |  | F23N 1/00 |
Regulating fuel supply

|  | F23N 1/02 |
· | conjointly with air supply

|  | F23N 1/08 |
· | conjointly with another medium, e.g. boiler water

P:10 |  | F23N 3/00 |
Regulating air supply or draught (conjointly with fuel supply Fulltext... Hierarchy... Expanded...F23N 1/00)

P:20 |  | F23N 5/00 |
Systems for controlling combustion (Fulltext... Hierarchy... Expanded...F23N 1/00, Fulltext... Hierarchy... Expanded...F23N 3/00 take precedence)

|  | F23N 5/02 |
· | using devices responsive to thermal changes or to thermal expansion of a medium

|  | F23N 5/08 |
· · | using light-sensitive elements

|  | F23N 5/12 |
· · | using ionisation-sensitive elements, i.e. flame rods

|  | F23N 5/14 |
· · | using thermo-sensitive resistors

|  | F23N 5/16 |
· | using noise-sensitive detectors

|  | F23N 5/18 |
· | using detectors sensitive to rate of flow of air or fuel

|  | F23N 5/20 |
· | with a time programme acting through electrical means, e.g. using time-delay relays

|  | F23N 5/22 |
· | with a time programme acting through mechanical means, e.g. using cams

|  | F23N 5/24 |
· | Preventing development of abnormal or undesired conditions, i.e. safety arrangements (Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F23N 5/02-F23N 5/18 take precedence)

|  | F23N 5/26 |
· | Details