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

ENGINEERING IN GENERAL

|  | F15 |
FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL

|  | F15B |
SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR (motors, turbines, compressors, blowers, pumps Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F01-F04; fluid dynamics Fulltext... Hierarchy... Expanded...F15D; fluid clutches or brakes Fulltext... Hierarchy... Expanded...F16D; fluid springs Fulltext... Hierarchy... Expanded...F16F; fluid gearing Fulltext... Hierarchy... Expanded...F16H; pistons, cylinders, packing Fulltext... Hierarchy... Expanded...F16J; valves, taps, cocks, actuating-floats Fulltext... Hierarchy... Expanded...F16K; safety valves with auxiliary fluid operation of the main valve Fulltext... Hierarchy... Expanded...F16K 17/10; fluid-operating means for valves Fulltext... Hierarchy... Expanded...F16K 31/12; pipes, pipe joints Fulltext... Hierarchy... Expanded...F16L; lubricating Fulltext... Hierarchy... Expanded...F16N)

|  | F15B |
Note(s) In this sub-class, the following terms are used with the meanings indicated: "Telemotor" means a system or device in which a substantially constant amount of fluid is trapped between an input member and an output member to act as a fluid link. "Servomotor" means a fluid-pressure actuator, e.g. a piston and cylinder, directly controlled by a valve or other device which is responsive to operation of an initial controlling member; "Servomotor" does not cover a telemotor. The initial controlling member may be adjacent to the servomotor or at a distance, and may be, for example, a hand lever.

|  | F15C |
FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES (transducers Fulltext... Hierarchy... Expanded...F15B 5/00; fluid dynamics in general Fulltext... Hierarchy... Expanded...F15D; computers comprising fluid elements Fulltext... Hierarchy... Expanded...G06D, Fulltext... Hierarchy... Expanded...G06G)

|  | F15D |
FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS (fluid-circuit elements Fulltext... Hierarchy... Expanded...F15C)

|  | F15D |
Note(s) This sub-class comprises boundary-layer control and other arrangements and methods, not provided for in other classes, for influencing the flow of fluids relative to constraining surfaces and after leaving these surfaces, e.g. producing or removing turbulence, deflecting jets, guiding flow through bends in conduits, affecting distribution of fluid in a conduit, reducing fluid friction.