POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS

Introduced: September 1968

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
Subclass:: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS

Description

F04B covers positive-displacement pumps and machines designed to move liquids by repeatedly expanding and contracting sealed volumes, forcing fluid through the system with each cycle. This subclass encompasses reciprocating pumps (piston and plunger types), rotary pumps (gear, screw, and vane designs), and diaphragm pumps, along with their essential components such as valves, actuators, and control systems. Applications include industrial fluid transfer, hydraulic systems, chemical processing, and fuel injection systems where consistent volumetric displacement and high-pressure capability are required. Excluded are dynamic (centrifugal) pumps, pumps for elastic fluids covered under F04C, and non-positive-displacement machines.

Scope Notes

Limiting references: Machines for liquids, or pumps, of rotary-piston or oscillating-piston type Non-positive-displacement pumps Pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped | Application references: Engine fuel-injection pumps

25 direct subcodes

Child Classifications

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F04B 1/00 Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
F04B 11/00 Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
F04B 13/00 Pumps specially modified to deliver fixed or variable measured quantities
F04B 15/00 Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
F04B 17/00 Pumps characterised by combination with, or adaptation to, specific driving engines or motors
F04B 19/00 Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups
F04B 23/00 Pumping installations or systems
F04B 25/00 Multi-stage pumps specially adapted for elastic fluids
F04B 27/00 Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
F04B 3/00 Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage
F04B 31/00 Free-piston pumps specially adapted for elastic fluids; Systems incorporating such pumps
F04B 33/00 Pumps specially adapted for elastic fluids actuated by muscle power, e.g. for inflating
F04B 35/00 Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
F04B 37/00 Pumps specially adapted for elastic fluids and having pertinent characteristics not provided for in, or of interest apart from, groups
F04B 39/00 Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups
F04B 41/00 Pumping installations or systems specially adapted for elastic fluids
F04B 43/00 Machines, pumps, or pumping installations having flexible working members
F04B 45/00 Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
F04B 47/00 Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
F04B 49/00 Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups