The Machine Parts ClipArt gallery offers 194 illustrations of couplings, valves, escapements, pumps, governors, and more.

This illustration shows a cross-section of a modern flour mill. 
Wheat is received in bin a, and first passes to the separator b, where it falls over vibrating screens, c, c, and a current of air draws light rubbish through  pipe e to fan d. Next, in scourer f, it passes through revolving beaters, and meets a current of air. In the brush g, revolving brushes further clean and polish the wheat, which then passes to the 'cylinder' h. This  revolving cylinder has grooves which pick up any small seeds, carrying them around until near the top of its revolution they drop into trough k and discharge by l at n, while the wheat grains too large for the grooving to affect, fall into the trough m, and are carried by the elevator p to the 'first break rolls', o. Here the wheat is partly crushed by rolls q, q, and passed to the 'scalper' r. Here, revolving brushes and beaters force the small particles through the fixed cage to the shoot s, while the larger are delivered at the end of the cage and pass to the second pair of rolls, t, and the second scalper, u. The coarse particles from u, chiefly bran, pass through a third set of rolls, v, and then to the 'bran duster', w, a cylinder where revolving brushes clean all flour from the bran and force it through perforations towards shoot x, the bran  being delivered at y. The flour is carried by elevator p' to the 'reel' z, a finely perforated cylinder which revolves rapidly, an the finer part passes by shoot s' to the 'centrifugal' u'; the coarser part delivered at the end of the cylinder, passes to the 'purifier' r', where a current of air removes light dust as it travels over a moving sieve, and thence to a set of rolls at t' for further reduction, after which it is delivered to the centrifugal u'. This is a revolving drum, covered with silk, through which the flour is thrown by centrifugal force, and is delivered finished at v', the offals passing out at the end of the drum to the shoot w'.

Modern Flour Mill

This illustration shows a cross-section of a modern flour mill. Wheat is received in bin a, and first…

A device for reducing the amount of noise emitted by a machine. On internal combustion engines, the engine exhaust blows out through the muffler.

Vehicle Muffler

A device for reducing the amount of noise emitted by a machine. On internal combustion engines, the…

Any of various devices for deadening sound, as the sound of escaping gases of an internal-combustion engine.

Vehicle Muffler

Any of various devices for deadening sound, as the sound of escaping gases of an internal-combustion…

An apparatus used to oil the crank pin of the belt drive system. The oil cup is filled with lubricant and travels through the small pipe, making the belt drive system to run smoothly.

Belt Drive Oiling Apparatus

An apparatus used to oil the crank pin of the belt drive system. The oil cup is filled with lubricant…

"The cylinder covers are also made hollow to permit a circulation of live steam. A cylinder having the annular space (A) filled with steam is said to be jacketed. A liner, L, is often used in jacketed cylinders." —Derr, 1911

Jacketing Piston to Reduce Heat Loss

"The cylinder covers are also made hollow to permit a circulation of live steam. A cylinder having the…

A rod which connects a rotary with a reciprocating part, either for imparting motion to the latter or taking motion from it, as that which couples a crank with a saw gate, or a steam piston with its crank shaft.

Pitman

A rod which connects a rotary with a reciprocating part, either for imparting motion to the latter or…

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark

Spark Plug

Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the…

A pod auger for boring

Pod Auger

A pod auger for boring

A pod auger for boring

Pod Auger

A pod auger for boring

A type of fan which transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and air or water is accelerated behind the blade.

General Purpose Propeller

A type of fan which transmits power by converting rotational motion into thrust. A pressure difference…

A propeller is a type of fan which transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and air or water is accelerated behind the blade.

Screw Propeller

A propeller is a type of fan which transmits power by converting rotational motion into thrust. A pressure…

"Diagram illustrating the disadvantage of an oblique pull." — Martin, 1917

Oblique pull

"Diagram illustrating the disadvantage of an oblique pull." — Martin, 1917

"The pulley is first put in a revolver lathe and there bored and reamed, while on edge of the rim is turned at right angles to the hub bore. Then the pulley is unchecked, and put on a mandrel." —Grimshaw, 1902

Turning Belt Pulleys

"The pulley is first put in a revolver lathe and there bored and reamed, while on edge of the rim is…

"A device for raising liquids or removing gas from a closed vessel." Foster, 1921. The image shows two types of pumps and their mechanisms: Fig. 1; a. barrel, b. piston, c. valve, d. reservoirs. Fig. 2; a. barrel, b. piston, c. valve in barrel, d. valve in stand pipe, e. reservoir, f. air chamber.

Pump

"A device for raising liquids or removing gas from a closed vessel." Foster, 1921. The image shows two…

"A double-acting pump of the piston pattern is shown [here]. Such a pump has two sets of suction valves and delivery valves, one set for each side of the piston. With the piston moving in the direction of the arrow, the pressure of the atmosphere forces the water up the suction pipe P into the left-hand end of the pump cylinder, the left-hand suction valve opens and the left-hand delivery valve is closed...The water now flows up the delivery pipe P'." —Hallock 1905

Double-acting Force Pump

"A double-acting pump of the piston pattern is shown [here]. Such a pump has two sets of suction valves…

"The forcing pump is represented where A is a solid piston, working air tight in its barrel. There tube, C leads from the barrel to the air vessel, D. Through the pipe, P, the water is thrown into the open air.G s a gauge, by which the pressure of the water in the air vessel is ascertained Through the water pipe I, the water ascends into the barrel, its upper end being furnished with a valve opening upwards." -Comstock 1850

Forcing Pump

"The forcing pump is represented where A is a solid piston, working air tight in its barrel. There tube,…

"As the piston ascends, as shown in the left-hand figure, the pressure of the atmosphere forces the water up the suction pipe P; the water opens the suction valve V and flows into the pump cylinder. When the piston moves down, as shown in the right-hand figure, the suction valve is closed and the delivery valve V' opened. The water in the pump cylinder is now forced up the delivery pipe P'." —Hallock 1905

Forcing Pump

"As the piston ascends, as shown in the left-hand figure, the pressure of the atmosphere forces the…

A device used to move fluids, such as liquids or slurries, or gases. A pump displaces a volume by physical or mechanical action. One common misconception about pumps is the thought that they create pressure. Pumps alone do not create pressure; they onl

General Purpose Pump

A device used to move fluids, such as liquids or slurries, or gases. A pump displaces a volume by physical…

"The lift pump or suction-pump consists of a cylinder or barrel, piston, two valves, and a suction pipe, the lower end of which dips below the surface of the liquid to be raised." — Avery, 1895

Lift pump

"The lift pump or suction-pump consists of a cylinder or barrel, piston, two valves, and a suction pipe,…

"In some cases it is desired to raise water higher than it can be forced by the pressure of the atmosphere into the chamber of a simple suction pump. To accomplish this the pump chamber with its bucket and valves are set at a distance above the supply not exceeding that to which the air will successfully force the water. A closed pipe, P', called the delivery, or discharge, pipe, is then led from the upper part of the chamber to the point where it is desired to deliver the water." —Hallock 1905

Lifting Pump

"In some cases it is desired to raise water higher than it can be forced by the pressure of the atmosphere…

"The action does not differ in any way from that of the piston force pump. During the up stroke of the plunger, the suction valve is open and the delivery valve is closed; during the down stroke, the suction valve is closed and the delivery valve is open." —Hallock 1905

Plunger Pump

"The action does not differ in any way from that of the piston force pump. During the up stroke of the…

A hydraulic machine used for raising liquids from a lower level to a higher level through a pipe or passage by a single piston that only pumps in one direction.

Single Acting Pump

A hydraulic machine used for raising liquids from a lower level to a higher level through a pipe or…

"The suction pump uses suction, water pressure and one-way valves to suction water from a well or other source, and to expel water through A." —Hallock 1905

Suction Pump

"The suction pump uses suction, water pressure and one-way valves to suction water from a well or other…

A straight or slightly curved metallic bar, with teeth n one of its edge, adapted to work into the teeth of a wheel or pinion, for the purpose of converting a circular into a rectilinear motion or vice versa.

Machinery Rack

A straight or slightly curved metallic bar, with teeth n one of its edge, adapted to work into the teeth…

A bar or piece of mechanism turning at one end upon a pivot, while the other end falls into the teeth of a wheel or rack, allowing the latter to move in one direction only.

Ratchet

A bar or piece of mechanism turning at one end upon a pivot, while the other end falls into the teeth…

A polished surface of metal, or any other suitable material, applied for the purpose of reflecting rays of light, heat, or sound in any required direction.

Parabolic, Reflector

A polished surface of metal, or any other suitable material, applied for the purpose of reflecting rays…

Pressure regulator is a valve that automatically cuts off the flow of a liquid or gas at a certain pressure.

Pressure Regulator

Pressure regulator is a valve that automatically cuts off the flow of a liquid or gas at a certain pressure.

A valve that automatically cuts off the flow of a liquid or gas at a certain pressure. Regulators are used to allow high-pressure fluid supply lines or tanks to be reduced to safe and/or usable pressures for various applications.

Pressure Regulator

A valve that automatically cuts off the flow of a liquid or gas at a certain pressure. Regulators are…

This furnace is used to purify a gold concentrate. The gold concentrates, if non-pyritic, are treated in grinding pans in the bottom of which mercury is placed. The amalgam (mercury alloy), after squeezing out the excess mercury, is heated in the retort, to distil (separate) off the rest and leave the gold, which is then melted and cast into bars of gold bullion of varying fineness.

Retort Furnace for Gold Bullion

This furnace is used to purify a gold concentrate. The gold concentrates, if non-pyritic, are treated…

"Nichols Rheostat. a, wooden frame; b, tinned iron strip; c, stationary, and c', movable binding-posts; d, copper strip for short-circuiting." -Whitney, 1911

Rheostat

"Nichols Rheostat. a, wooden frame; b, tinned iron strip; c, stationary, and c', movable binding-posts;…

Steel rods connecting the pump inside well tubing down-hole to the pumping jack on the surface.

Sucker Rod

Steel rods connecting the pump inside well tubing down-hole to the pumping jack on the surface.

"a, scroll-wheel, intermeshing with the pinion b, which, sliding by a feather on the shaft, c, imparts a gradually decreasing velocity to the latter as b is moved toward the center of a." -Whitney, 1911

Scroll Wheel

"a, scroll-wheel, intermeshing with the pinion b, which, sliding by a feather on the shaft, c, imparts…

"As the eccentric turns in the strap, the point O moves in the dotted circle around O', and the point A also moves in a circle. When half a revolution is accomplished the point O will be at O", the Point A will be at A", and the eccentric strap and valve rod will be in the position indicated by the dotted lines." —Derr, 1911

Shaft in an Eccentric Motion from Steam Engine

"As the eccentric turns in the strap, the point O moves in the dotted circle around O', and the point…

A restraint provided when the brake linings are moved hydraulically against the brake drum to retard the wheel's rotation

Brake Shoe

A restraint provided when the brake linings are moved hydraulically against the brake drum to retard…

"A slide-rest such as would be used with the lathe in the previous engraving, for which purpose simplicity of construction and steadiness in all its parts are the points chiefly aimed at." —The Encyclopedia Britannica, 1910

Slide-Rest

"A slide-rest such as would be used with the lathe in the previous engraving, for which purpose simplicity…

"The self-acting slide-rest carries reduction by driving the lathe itself the small "feed" movement necessary for bringing the tool to bear on successive portions of the work, it dispenses wholly with the need for physical exertion on the part of the workman, and does not even demand his continuous supervision." —The Encyclopedia Britannica, 1903

Slide-Rest

"The self-acting slide-rest carries reduction by driving the lathe itself the small "feed" movement…

This is a spark plug which fits into the cylinder head of some internal combustion engine and ignites compressed fuels such as aerosol gasoline.

Spark Plug

This is a spark plug which fits into the cylinder head of some internal combustion engine and ignites…

A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed fuels such as, aerosol gasoline, Ethanol, and Liquefied petroleum gas by means of an electric spark.

Automotive Sparkplug

A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines…

A coiled wire spring, used for various purposes.

Spring

A coiled wire spring, used for various purposes.

An illustration of a clock spring which is a special rotary electrical connector. The clock spring allows a vehicle's steering wheel to turn while sill keeping a connection between many devices within the steering column.

Clock Spring

An illustration of a clock spring which is a special rotary electrical connector. The clock spring allows…

A spring in the shape of a coil.

Multiple Purpose Spring

A spring in the shape of a coil.

A stamp mill facilitates the crushing of ore (in this case, gold ore) into very small grains, with many mechanical parts, including: the ore car, to carry ore from the mine to the Mill (a); the trestle, the tunnel from the mine to the mill that the ore car travels through (b); the grizzly (c); the crushing floor (d); the bin for crushed ore (e); the stamp, a vertical iron rod having a cast-iron or steel shoe, which, falling on the mortar block, crushes the ore (f); the mortar (g); and the apron plate (h).

Stamp Mill for Gold Ores (Sectional View)

A stamp mill facilitates the crushing of ore (in this case, gold ore) into very small grains, with many…

Cross-section of a steam engine plant with Alberger barometric condenser and cooling tower.

Steam Engine

Cross-section of a steam engine plant with Alberger barometric condenser and cooling tower.

"A modification of Savery's engine, the pulsometer, is still quite common. It is used in places where an ordinary pump could not be used and where extreme simplicity is of especial advantage. Its valves work automatically and it requires very little attention." —Derr, 1911

Pulsometer from Steam Engine

"A modification of Savery's engine, the pulsometer, is still quite common. It is used in places where…

"This arrangement makes it possible to place the valve and steam chest above the valve motion. A rod from the bell crank lever on the reverse shaft E, leads back to the engineer's cab and connects with the reverse lever." —Derr, 1911

Steam Engine Rocker Arrangement with Valve and Reverse Rod in Eccentric Motion

"This arrangement makes it possible to place the valve and steam chest above the valve motion. A rod…

"The valve gear for operating the steam hammer is shown separately, the cylinder and valve chest being in section."—Finley, 1917

Valve gear of a steam hammer

"The valve gear for operating the steam hammer is shown separately, the cylinder and valve chest being…

"A small enclosure, to prevent the escape of steam, etc., at a joint in machinery. — Williams, 1889

Stuffing-box

"A small enclosure, to prevent the escape of steam, etc., at a joint in machinery. — Williams,…

"Place a bit of tinder in the cavity of the piston of the 'fire-syringe'. Put the piston into the open end of the cylinder and force it in, compressing the confined air as abruptly as possible. Promptly remove the piston. The tinder will probably be on fire." — Avery, 1895

Fire syringe

"Place a bit of tinder in the cavity of the piston of the 'fire-syringe'. Put the piston into the open…

Telegraphy is the long distance transmission of written messages without physical transport of letters. A telegraph is a device for transmitting and receiving messages over long distances.

The Inner Workings of Telegraphy

Telegraphy is the long distance transmission of written messages without physical transport of letters.…

A piece of laboratory equipment. It is a laboratory tube used much in the same way as a boiling tube except not being as large and thick-walled.

Ignition Tube

A piece of laboratory equipment. It is a laboratory tube used much in the same way as a boiling tube…

A tube near the waterline of a vessel through which a torpedo is fired

Torpedo Tube

A tube near the waterline of a vessel through which a torpedo is fired

An 'arm' inside a typewriter with a character on the end of it. There are generally two characters per typebar, one which will be printed if the corresponding key is struck by itself, the other of which will be printed if the corresponding key is struck while the shift key is held.

Detachable Typebar

An 'arm' inside a typewriter with a character on the end of it. There are generally two characters per…

This illustration shows a V type motor with eight cylinders, fans, and many other parts: Gasoline Supply Pipe, Carburetor, Water Supply Connection, Centrifugal Pump, Intake Manifold Connection, Water Jacket Connection, Cylinder, Valve Rocker Arm, Manifold, Radiator Connection, and Magneto.

V Type Motor, with Eight Cylinders

This illustration shows a V type motor with eight cylinders, fans, and many other parts: Gasoline Supply…

A device that regulates the flow of a fluid gases, liquids, fluidized solids, or slurries by opening, closing, or partially obstructing various passageways. Valves are technically pipe fittings, but are usually discussed as a separate category.

Coarse Threading Valve

A device that regulates the flow of a fluid gases, liquids, fluidized solids, or slurries by opening,…

A dome shaped valve which is vertically reciprocated over a slotted box.

Crown Valve

A dome shaped valve which is vertically reciprocated over a slotted box.

A cup shaped or conical valve which is guided by a stem to and from its flaring seat.

Cup Vavle

A cup shaped or conical valve which is guided by a stem to and from its flaring seat.

A structure in a hollow organ like the heart with a flap to insure one-way flow of fluid through it

Fine Threading Valve

A structure in a hollow organ like the heart with a flap to insure one-way flow of fluid through it

Control consisting of a mechanical device for controlling the flow of a fluid

Fluid Valve

Control consisting of a mechanical device for controlling the flow of a fluid

An illustration of a lever safety valve. "Suppose the valve A is just suppose to open when the steam pressure under it is 120 lb. per square inch, that mean area of the valve exposed to steam pressure is 4 square inches, the weight of the valve 4ln., the distance C D being 3 inches the centre of gravity of the lever 7 inches from D, and its weight 6 lb.; where must the weight E - which is 50 lb. - be placed on the lever? The total upward force on the valve is 120 × 4 - 4 = 476 lb., and the moment of this force about D is 476 × 3 = 1428. This is the only negative moment, all other forces tending to turn the lever the opposite way." -New, 1891

Lever Safety Valve

An illustration of a lever safety valve. "Suppose the valve A is just suppose to open when the steam…

A device fitted to a pipeline or orifice in which the closure member is either rotated or moved in some way as to control or stop flow.

Mechanical Valve

A device fitted to a pipeline or orifice in which the closure member is either rotated or moved in some…