Piston Sentence Examples

The cylinder, in which a well-fitting piston worked, was provided at its lower end with two valves.

In a particular case where the boiler pressure was maintained constant at 130 lb per square inch, and the cut-off was approximately 20% of the stroke, the values c =55 and b=o 031 were deduced, from which it will be found that the value of the piston speed corresponding to the maximum horsepower is 887 ft.

On again F J J raising the piston the valve E opens ?g G admitting more liquid whilst F re- mains closed.

The piston rod passes through a valve in the upper part of the cylinder which is held to its seat by a spring.

The total upward pressure on this piston is calculated to be equal to 150,000 lb; hence the shaft-bearings are practically relieved from pressure when the wheels are running.

In practice it may be considerably less, owing to leakage at the valves and between the piston and cylinder.

Let a represent the area of the section of a piston made by a plane perpendicular to its direction of motion, and v its velocity, which is to be considered as positive when outward, and negative when inward.

In this case the piston is solid, and the outlet pipe, G which is placed at the bottom of the cylinder, has a valve F opening outwards, the inlet pipe and valve are the same as before.

The air inside is compressed in consequence and during an upstroke of the piston this air tends to regain its original volume and so expels the water, thus bringing about a continuous supply.

Some of the oil is also driven out, but as the valve does not close until the piston has descended a short distance, a certain amount of oil returns.

If a thrust P lb is applied to one piston of area A ft.

A closely-fitting adjustable piston is provided at one end.

Even then, however, the amount of operative heat is very small in comparison with that which passes through the steam-engine, per cubic foot swept through by the piston, for the change of state which water undergoes in its transformation into steam involves the taking in of much more heat than can be communicated to air in changing its temperature within such a range as is practicable.

It then takes in heat from the furnace, expanding in volume and forcing the piston (B) to rise, which completes the cycle.

During the down stroke of the piston the wing is flattened out in every direction, and its extremities twisted in such a manner as to form two screws, as seen at a' b' c' d', e' f' g' h', B, B'.

A small pilot piston is attached to the bottom of the spool valve.

Distribution of steam is effected by a slide valve, sometimes fitted with a balancing device, and sometimes formed into a piston valve.

Sand, driven between the wheel and the rail by a steam jet, used just at starting, increases the adhesion beyond the normal value and enables a larger pressure to be exerted on the piston than would otherwise be possible.

The expression for the indicated horse-power may be written I.H.P. =pay/550 (27) where v is the average piston speed in feet per second.

Any modification of the design which will reduce the resistance to the flow of steam through the steam passages at high speeds will increase the piston speed for which the indicated horse-power is a maximum.

The unbalanced masses of a locomotive may be divided into two parts, namely, masses which revolve, as the crank-pins, the crank-cheeks, the couplingrods, &c.; and masses which reciprocate, made up of the piston, piston-rod, cross-head and a certain proportion of the connecting-rod.

The simplest forms of pumps employed for forcing liquids are "plunger pumps," consisting essentially of a piston moving in a cylinder, provided with inlet and outlet pipes, together with certain valves.

E is a valve in the inlet pipe opening into the cylinder; and A the piston is perforated by one or more holes, each fitted with valves opening outwards on its upper surface.

On raising the piston the liquid rises in the cylinder, the valve E opening and F remaining shut.

It is seen that the action is intermittent, liquid only being discharged during a down stroke, but since the driving force is that which is supplied to the piston rod, the lift is only con ditioned by the power available and by the strength of the pump. A continuous supply can be obtained by leading the delivery pipe into the base of an air chamber H, which is fitted with a discharge pipe J of such a diameter that the liquid cannot escape from it as fast as it is pumped in during a down stroke.

During the down-stroke of the piston the former was pressed home, so that no air entered the nozzle and vessel, while the latter was forced open by the air which so escaped from the cylinder.

Thus, at every complete stroke of the piston, the air in the vessel or receiver was diminished by that fraction of itself which is expressed by the ratio of the volume of the available cylindrical space above the outward opening valve to the whole volume of receiver, nozzle and cylinder.

This type of pump is, however, not very efficient, for there is not only leakage about the valves and between the piston and cylinder, but at a certain degree of exhaust the air within the vessel is insufficient to raise the inlet valve; this last defect has been met in some measure by using an extension of the piston to open and close the valve.

The piston, provided with a valve opening upwards, is packed in the cylinder by a leather cup which is securely pressed against the sides of the cylinder by the atmospheric pressure.

On lowering the piston its valve opens and air passes in from the vessel to be exhausted; this is further rarefied on the next stroke and so on.

Every drop of mercury, as it enters from the funnel, entirely closes the narrow tube like a piston, and in going past the place where the side tube enters entraps a portion of air and carries it down to the trough, where it can be collected.

It has been shown that this behaviour of dielectrics can be imitated by a mechanical model consisting of a series of perforated pistons placed in a tube of oil with spiral springs between each piston.

In the first method reciprocating bells, or piston machines, or rotary machines of varying capacity like gas-works exhausters, are employed.

This machine depended simply on the pressure of water acting directly in a cylinder on a piston, which was connected with suitable multiplying gear.

Hence, when in 1850 a hydraulic installation was required for a new ferry station at New Holland, on the Humber estuary, the absence of water mains of any kind, coupled with the prohibitive cost of a special reservoir owing to the character of the soil, impelled him to invent a fresh piece of apparatus, the "accumulator," which consists of a large cylinder containing a piston that can be loaded to give any desired pressure, the water being pumped in below it by a steam-engine or other prime mover.

Boulton and Watt's screw press, invented in 1788 and used at the Royal Mint until 1881, was worked by atmospheric pressure applied to a piston.

Stationary waves are formed in the air in the dust-tube if the length is rightly adjusted by the closely-fitting piston, and the lycopodium dust collects at the nodes in little heaps, the first being at the fixed end and the last just in front of the piston on the sounder.

A piston made of such a perforated substance, therefore, may be used to exert pressure on the liquid, while all the time the vapour is able to pass.

The simplest way to do this is to imagine a vapour-sieve piston through which the vapour but not the liquid can pass.

Let us imagine unit mass of solution of volume V confined in a cylinder ABC between a fixed vapour sieve B and a solid piston A A B C FIG.

The vapour at pressure p in equilibrium with the liquid is bounded by a solid piston C, which we can also move to change the pressure or volume.

If it be filled with a solution and the bottom immersed in the pure solvent, pressure equal to the osmotic pressure must be exerted on the piston to maintain equilibrium.

In A there is a displacer (D) which is connected (by parts not shown) with the piston in such a manner that it moves down when the piston has moved up. The air-pressure is practically the same above and below D, for these spaces are in free communication with one another through the regenerator (E), which is an annular space stacked loosely with wire-gauze.

The piston (B) descends, and the air, now in contact with the cooling pipes (C), gives up heat to them.

Then the variation of the cubic contents of the vessel in a unit of time by reason of the motion of one piston is Va.

In the pneumatic power-transmitter the motion of one piston if transmitted to another at a distance by means of a mass of air contained in two cylinders and an intervening tube.

Reciprocating PiecesStrokeDead-P o-jnts.T he distance between the extremities of the path of the connected point in a reciprocating piece (such as the piston of a steam-engine) is called the stroke or length of stroke of, that piece.

In balancing the mechanism of a steam engine it is often sufficiently accurate to consider the motion of the pistons as simple harmonic, and the effect on the framework of the acceleration of the connecting rod may be approximately allowed for by distributing the weight of the rod between the crank pin and the piston inversely as the centre of gravity of the rod divides the distance between the centre of the cross head pin and the centre of the crank pin.

A more accurate though still approximate expression for the force on the frame due to the acceleration of the piston whose weight is W is given by w2r cos 0 + r cos 20

The lower portion of the neck was occupied by a piston and cup, in and on which the toe of the spindle worked.

An ordinary formula for obtaining it is 1 S for highpressure engines, and S for condensing engines, where D is the diameter of the piston in inches and S the length of the stroke in feet, though varying numbers are used for the divisor.

It is furnished with springs at its root to contribute to its continued play, and is applied to the air by a direct piston action in such a way that it descends in a downward and forward direction during the down stroke, and ascends in an upward and forward direction during the up stroke.

During the up stroke of the piston the wing is very decidedly convex on its upper surface (a b c d, A A'); its under surface (e f g h, A A') being deeply concave and inclined obliquely upwards and forwards.

To deaden the vibration of the springs after a load has been placed on the platform, and thus to enable the weights and values of the goods to be read rapidly, the piston of a glycerin cylinder is attached to the end of the lever which pulls upon the hook of the horizontal bar and is worked by it in the glycerin.

At the bottom of the vertical leg from the goods-pan there is also a projecting piece which is attached to the top of a vertical piston rod, the piston of which plays in a dash-pot of glycerin as the beam sways, and deadens the vibrations of the index arm.

The compressed air, leaving the compressor at the temperature T2, passes through the cooler, where it is cooled by means of water, and is then admitted to the expansion cylinder, where it is expanded to atmospheric pressure, performing work on the piston.

The heat equivalent of the mechanical work performed on the piston is abstracted from the air, which is discharged at the temperature T 1.

The tank is filled with water, which is kept in agitation by means of a reciprocating paddle or piston; in this way the air escapes, and with proper care a block of great transparency is produced.

A single seat light autogyro powered by a Victa Pixie 173cc 2-stroke single cylinder piston engine.

A system designed to counter a 400 mph piston engined bomber just could not cope with the new threat.

Twin piston, twin caliper front brake and single twin piston caliper rear brake.

The Atlantic Sprint features large 260 mm diameter front disks with a triple parallel piston floating caliper and a 220 mm rear disk.

The 240 mm rear disk and single piston caliper provide the perfect balance between stopping power and ease of control.

Once we got the cylinder going down the studs we found the casings required some grinding to allow the piston down!

Richie, on board to run the piston corer, removing a mud core from the barrel.

As the piston moves up and down in the cylinder it rotates the crankshaft and converts the straight line motion into rotary motion.

June 28 2003 Nicely undercover in the shed are various items including the outside lefthand crosshead (re-metalled) and the piston.

Remove the inlet manifold and both heads, and inspect the piston crowns and valves for signs of heavy contact.

To our knowledge there is not a Japanese style piston that goes straight into a standard TS1 cylinder that is worth using.

Like the first stage the 2nd stage scuba regulator uses a diaphragm or piston to open a valve.

It had a diaphragm which moves a piston which does two things.

These engines tend to run at high piston speeds to achieve maximum efficiency.

Tests are used to evaluate the friction between piston and cylinder one for dynamic friction, and one for static friction.

Skimming the head also increases the compression ratio and to avoid detonation with low octane fuel a low compression piston is used.

Uses an oversized piston to clean up damaged bores, uses maximum safe piston size giving largest cc's.

Allows the caliper piston to be wound back for the fitting of new brake pads.

For this reason we have stopped using the sr piston.

A stainless steel piston rod is also an option.

The triple-layered piston rods pull the moving platen in the direction of the fixed platen, in which the clamping cylinder is integrated.

The air resistance mechanism ensures a smoother ride than the piston resistance machines.

This type of process is applied to needle or roller bearings, gears and piston rings, gears and piston rings.

The center hole in the end cover is for the piston rod whilst the hole to the left is for the pressure relief valve.

As was customary at the time of construction, 1910, the HP side has piston valves whilst the LP side has slide valves.

The air spring strut also features a piston moving into the damper chamber.

Cossart valve-gear Valve gear with four piston valves per cylinder operated by rotary cams.

Engine efficiency depends upon many variable factors, such as the cut-off, the piston speed, the initial temperature of the steam, the final temperature of the steam, the quality of the steam, the sizes of the steam-pipes, ports and passages, the arrangement of the cylinders and its effect on condensation, the mechanical perfection of the steam-distributing gear, the tightness of the piston, &c. A few values of the thermal efficiency obtained from experiments are given in Table XXI.

The cross-section of the cars was made to conform approximately to the section of the tunnel, the idea being that each train would act like a piston in a cylinder, expelling in front of it a column of air, to be forced up the station shaft next ahead of the train, and sucking down a similar column through the station shaft just behind.

The earliest mercurial pump, devised by Swedenborg and described in his Miscellanea observata circa yes naturales (1722), was statical in action, consisting essentially in replacing the solid piston of the mechanical pump by a column of mercury, which by being alternately raised and lowered gradually exhausted a vessel.

The "indicated horse-power" of a reciprocating engine is given by Aspn/ 33,000, where A is the area of the piston in square inches, S the length of the stroke in feet, P the mean pressure on the piston in lb per sq.

This type of process is applied to needle or roller bearings, gears and piston rings.

It was then that he saw Piston Jack sidle into the room, his arms going.

On most Lambretta engines machining a head to the dome of the piston will give a correct squish band for power.

Powered by new steam turbines she had a top speed of 21 knots, 3 knots faster than battleships with traditional piston engines.

They are a leading manufacturer of gear, piston and vane pumps.

By replacing 68 vane type air motors with piston type air motors, an automotive paint plant has cut air consumption by 85 %.

Also returning to battle are such favorites as Bald Bull, Don Flamenco, Glass Joe, Great Tiger, Sandman, Soda Popinski, and Piston Hondo (previously known as Piston Honda).

Internal combustion uses an explosive combustion of gasoline or diesel to operate the piston, cylinder, crankshaft and then the driveshaft of a car.

First developed in the 1970s by the Henley Corporation, hydraulic exercise equipment provides resistance against movement of a lever pushing against hydraulic fluid in a piston.

The so-called oil air-pumps are much more efficient; the valve difficulty is avoided, and the risk of leakage minimized; whilst in addition there is no air clearance between the piston and the base of the cylinder as in the older mechanical forms. The Fleuss pump may be taken as an example.

These machines, which are driven by compressed air, are very handy in use, as the height and direction of the cut may be readily varied; but the work is rather severe to the driver on account of the recoil shock of the piston, and an assistant is necessary to clear out the small coal from the cut, which limits the rate of cutting.

For a stated value of the boiler pressure and the cut-off the mean pressure p is a function of the piston speed v.

On raising the piston, the valve F remains closed and a vacuum tends to be created in the cylinder, but the pressure of the atmosphere forces the liquid up the tube D and it raises the valve E and passes into the cylinder.

On again raising the piston, more liquid enters the lower part of the cylinder, whilst the previously raised liquid is ejected from the delivery pipe.

The piston was in communication with a vacuum vessel from which the air had been pumped by steam power.

The area B of the top side of the upper piston is proportioned in such a way that when under the full water pressure the dead weight of the ram and cage is just balanced when the former is at the bottom of its stroke.

To allow the lift-ram to descend, the pressure-water in C above the lower balance piston is discharged through the exhaust into the drain, while that above the upper piston is simply pushed back into the pressure main.

Fred grumbled, but Dean just slapped his back and began to whistle, as if he didn't have a care in the world, while his mind turned like a racecar piston on the final lap.

Below the piston of the upper cylinder is an annular space E (surrounding the common piston rod) with a capacity equal to the maximum displacement of the liftram, while the corresponding annular area C of the piston of the lower cylinder is just large enough when subjected to the working water pressure to enable the work of lifting the net load to be done and any friction to be overcome.