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valve

Definitions

  • Centrifugal ball governor and throttle valve
    Centrifugal ball governor and throttle valve
  • WordNet 3.6
    • n valve one of the paired hinged shells of certain molluscs and of brachiopods
    • n valve the entire one-piece shell of a snail and certain other molluscs
    • n valve control consisting of a mechanical device for controlling the flow of a fluid
    • n valve device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
    • n valve a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
    • ***

Additional illustrations & photos:

Beighton's Valve Gear Beighton's Valve Gear
Albion Mills Engine Valve Gear Albion Mills Engine Valve Gear
Stephenson Valve Gear Stephenson Valve Gear
Fine Adjustment Valve Fine Adjustment Valve

Webster's Revised Unabridged Dictionary
  • Interesting fact: Neither the saxophone, the tuba, the coronet, nor the valve trumpet existed before 1800.
    • Valve A door; especially, one of a pair of folding doors, or one of the leaves of such a door. "Swift through the valves the visionary fair
      Repassed."
      "Heavily closed, . . . the valves of the barn doors."
    • Valve A lid, plug, or cover, applied to an aperture so that by its movement, as by swinging, lifting and falling, sliding, turning, or the like, it will open or close the aperture to permit or prevent passage, as of a fluid.
    • Valve (Bot) A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry.
    • Valve (Bot) One of the pieces into which a capsule naturally separates when it bursts.
    • Valve (Zoöl) One of the pieces or divisions of bivalve or multivalve shells.
    • Valve (Bot) One of the two similar portions of the shell of a diatom.
    • Valve (Anat) One or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or retard the flow in the opposite direction; as, the ileocolic, mitral, and semilunar valves .
    • ***
Century Dictionary and Cyclopedia
    • n valve metal arcs, especially the mercury arc.
    • n valve A lifting-valve in which the contact with the top surface above the opening in the seat has a plane or flat area, as distinguished from one in which a part of the surface of a cone fits into a conical edge in the opening.
    • n valve A clack- or flap-valve.
    • n valve Specifically, in an internal-combustion motor cylinder, the valve through which the combustible mixture of fuel and air enters, having been previously proportioned by proper mixing apparatus, usually also valves.
    • n valve A cylindrical valve, fitting a cylindrical casing, controlling openings or ports made in the cylindrical surface by a rotation of the cylinder around its axis. When the valve is a cone fitting a conical surface it is a plug-valve.
    • n valve A valve held shut by a determined force, such as a weight or spring, so that by it the pressure in the duct or passage may be tested.
    • n valve apply the brake, and
    • n valve release the brake. Its essential elements are a balanced piston, on one side of which is the pressure in the brake-pipe and on the other side the pressure in the auxiliary reservoir; a slide-valve, on top of which is the pressure in the auxiliary reservoir; and a graduating-valve, which opens or closes certain ports in the slide-valve. When charging the system, air from the brake-pipe passes through a feed-groove around the piston of the triple valve and so into the auxiliary reservoir, charging it with compressed air, the slide-valve meanwhile connecting the brake-cylinder to the exhaust port and atmosphere through ports in its face. When the pressure in the brake-pipe falls below that in the auxiliary reservoir, the balance of pressure on the piston is destroyed and the piston moves toward the now lower brake-pipe pressure, carrying with it the graduating- and slide-valves which cut off the auxiliary reservoir from the brake-pipe
    • n valve cut off the brake-cylinder from the atmosphere, and
    • n valve connect the auxiliary reservoir with the brake-cylinder, thus admitting compressed air to the brake-cylinder, which forces the piston in this cylinder outward, and, through the connecting levers and rods, sets the brake. For any definite reduction in brake-pipe pressure short of the point at which the brake-cylinder and auxiliary reservoir pressures equalize, the increase of brake-cylinder pressure continues until the auxiliary reservoir pressure falls slightly below that remaining in the brake-pipe when the triple-valve piston returns in the direction of the now lower auxiliary reservoir pressure, carrying with it the graduating-valve, until the latter cuts off the flow of air from the auxiliary reservoir to the brake-cylinder, when all communication through the triple valve is closed. When the pressure in the brake-pipe is then increased above that in the auxiliary reservoir sufficiently to overcome the resistance of both the piston and slide-valve, the parts return to their first position, charging the auxiliary reservoir anew and connecting the brake-cylinder to the atmosphere, which releases its charge and allows the release-springs to return its piston with the attached levers, rods, and brake-shoes to their original positions and releasing the shoes from the wheels. Various improved types of triple valves are now in use, providing for differentiating between service and emergency brake-cylinder pressures, for graduating the release of all brakes in the train, for a rapid serial service application of all the brakes in long trains, for uniform releasing and uniform recharging of all the brakes in long trains, and so on.
    • n valve One of the leaves of a folding door; in the plural, a folding door.
    • n valve Any device or appliance used to control the flow of a liquid, vapor, or gas, or loose material in bulk, through a pipe, passageway, outlet, or inlet, in any form of containing vessel. In this wide and general sense, the term includes air-, gas-, steam-, and water-cocks of any kind, water-gates, air-gates, and keys to musical wind-instruments. Rotary valves are valves in which the leaf, disk, plug, or other device used to close the passage is made to revolve for opening or closing (the common stop-cock being an illustration); lifting-valves are those in which the ball, cone, or other stopper is lifted or raised clear of the valve-seat by pressure (usually that of the gas, steam, or liquid in the pipe) from below, the poppet-, ball-, and safety-valves being examples; hinged valves constitute a large class used in both air- and water-pipes, as the butterfly-valves, clackvalves, and other forms in which the leaf or plate of the valve is fastened on one side to the valve-seat or opening. Springs are sometimes used to keep such valves closed. Sliding valves are those in which the gate or leaf slides aside to open the valve-way, the D-valve and some forms of water- and gas-main valves being examples. The long-hinged valves of a pipe-organ, and the round stoppers operated by keys, as in the flute and other instruments, are called key-valves. The names by which valves are distinguished are often descriptive of the shape or motion of the valves, of their use, or of the method by which they are operated, as globe-valve, screw-valve, blow-through valve, relief-valve, throttle-valve. In a trade sense, valves appear to be distinguished from cocks. A cock is a small plug-valve operated by hand. Other valves moved by screws or levers, or operated by power through some machinery, all self-acting appliances, and all large or complicated gates, stoppers, or cocks, are called valves. The universal use of steam, gas, and water has led to the invention of a great variety of valves. Iu musical wind-instruments of the trumpet class, the valve is a device for changing the direction and length of the air-column so as to alter the pitch of the tone. The two forms most in use are the piston and the rotary valve—the former being a perforated plunger working in a cylindrical case, and the latter a four-way cock, both being operated by the fingers of the player's right baud. The result of using a valve is to add to the main tube of the instrument a supplementary tube or crook of such length that the proper tone of the whole is lowered by some definite interval. The number of valves is commonly three, the first lowering the fundamental tone a whole step (and all its harmonics proportionally), the second lowering it a half-step, and the third a step and a half. A fourth valve is sometimes added on large instruments, lowering the pitch two steps and a half; and five and six valves have occasionally been tried. Two or more valves are used simultaneously with combined effect. Valves are more or less demanded to compensate for the incompleteness of the scale of all instruments of this family, and to provide for rapid changes of tonality. They are also useful in particular cases to remedy the inaccuracy for concerted music of certain of the regular harmonic series of tones. Their extended application has greatly developed the capacity of all kinds of brass instruments for rapid and unrestricted execution. But on the other hand valves and supplementary crooks cannot always give exactly accurate intonation, and the angles which they more or less necessitate in the air-column tend to injure the purity of the tones. Various compensations for these drawbacks have been attempted, with some success; but valve-instruments are still seldom used in the orchestra, while they arc numerous in military bands. See piston, 2, and compare key, 4 . See cuts under back-pressure, ball-cock, conical, organ, reed-organ, twin-valve, slide-valve, steam-engine, safety-valve.
    • n valve In anatomy and zoology, a membranous part, fold, or thin layer which resembles a valve, or actually serves as a valve in connection with the flow of blood, lymph, or other fluid; a valva or valvular as, the valve of Vieussens in the brain; the connivent valves of Kerkring in the intestine; valves of the heart, of the veins, etc. See cuts under bulb, Crinoidea, heart, lymphatic, and vein.
    • n valve In botany, in flowering plants, one of the segments into which a capsule dehisces, or which opens like a lid in the dehiscence of certain anthers. In Diatomaceæ each half of the silicified membrane or shell is called a valve. See cuts under Marsilea, septicidal, and silicle.
    • n valve In conchology, one of the two or more separable pieces of which the shell may consist, or the whole shell when it is in one piece; each shell, right and left, of ordinary bivalves, and each shell, dorsal and ventral, of brachiopods. See bivalve, multivalve, univalve, equivalve, inequivalve, and cuts under Caprotinidæ, Chamidæ, integropalliate, and sinupalliate.
    • n valve In entomology, a covering plate or sheath of any organ, generally one of a pair of plates which unite to form a tube or vagina, as those covering the external sexual organs, ovipositor, etc.
    • n valve Any formation serving to obstruct or close the pyloric orifice of the stomach. A pylorus may have a valvular construction, or a muscular sphincter may surround the orifice. See pylorus, 2 .
    • ***
Chambers's Twentieth Century Dictionary
    • n Valve valv one of the leaves of a folding-door: a cover to an aperture which opens in one direction and not in the other: one of the pieces or divisions forming a shell:
    • n Valve valv (anat.) a membraneous fold resembling a valve or serving as a valve in connection with the flow of blood, lymph, or other fluid—also Val′va
    • ***

Etymology

Webster's Revised Unabridged Dictionary
L. valva, the leaf, fold, or valve of a door: cf. F. valve,
Chambers's Twentieth Century Dictionary
Fr.,—L. valva, a folding-door.

Usage

In literature:

But a look around showed every lever and every valve, everything marked with its own name and number.
"The U-boat hunters" by James B. Connolly
Blew a valve, is all.
"The Bramble Bush" by Gordon Randall Garrett
We'll have to open the ventilation valves immediately.
"The Sky Trap" by Frank Belknap Long
A man in a diving suit went down to fix something that went wrong with one of the valves, and they can't get him up.
"Joe Strong, the Boy Fish" by Vance Barnum
A turn of the valve resulted in a sudden short inrush of water.
"Boy Scouts in the North Sea" by G. Harvey Ralphson
The valves at I are of brass, ground so as to be completely water-tight.
"Fire Prevention and Fire Extinction" by James Braidwood
Valves can control the steam perfectly, and regulate the flow to whatever is desired.
"Wanted--7 Fearless Engineers!" by Warner Van Lorne
The timing of the spark will be dealt with in the chapter on Cams and Valve Settings.
"Gas and Oil Engines, Simply Explained" by Walter C. Runciman
Does this symptom of vomiting indicate, whether the disease be above or below the valve of the colon?
"Zoonomia, Vol. II" by Erasmus Darwin
Then he opened a valve at the bottom of the tank.
"El Diablo" by Brayton Norton
Mick Darby was keeping the trough-valves at full pressure, and the manager rode over to him.
"In the Musgrave Ranges" by Jim Bushman
He patiently resumed the tedious task of bringing the valve in reach of his locked hands.
"The Martian Cabal" by Roman Frederick Starzl
Between the panels and at top and bottom of the valves of the door are ten projecting heads.
"Christopher Columbus and His Monument Columbia" by Various
Fruit globular, depressed at the top, splitting readily into 4 wholly separate valves.
"Trees of the Northern United States" by Austin C. Apgar
The inner, or mucous coat is thrown into folds, or valves.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
His hands wandered uncertainly toward the valves and closed the upper one.
"Astounding Stories of Super-Science, December 1930" by Various
Valves: A two-valve-per-cylinder model was built, but not put into production.
"The First Airplane Diesel Engine: Packard Model DR-980 of 1928" by Robert B. Meyer
Sir: The handle on the valve is missing, and I can't turn off the radiator.
"The So-called Human Race" by Bert Leston Taylor
Denver retraced his steps to the frosty airlock valve of his ship.
"Master of the Moondog" by Stanley Mullen
Valves and rocker arms were similar to those of the early engines, the automatic inlet valve being retained.
"The Wright Brothers' Engines and Their Design" by Leonard S. Hobbs
***

In poetry:

Then open the valves - Drive the fires high,
Your blossoms nurturing.
(Day is at the gates
And a young wind…)
"The Song Of Iron" by Lola Ridge
We never ran time, and were always late;
Now a throttle valve would get choked and stop,
Then an axle grow hot as a coal in the grate,
Next a tube would burst, and—into the shop.
"Rid of His Engine" by Alexander Anderson
And so I would not have thee change, for fear
The valves might open and gape a little, dear.
But we are like the weather
A-changing every day,
And so I pray
That we may change together —
"Twin-Growth" by William Cosmo Monkhouse
Every sober clam below her,
Every sage and grave pearl-grower,
Shut his rusty valves the tighter;
Crow called to crow complaining,
And old tortoises sat craning
Their leathern necks to sight her.
"Voyage of the Jettie" by John Greenleaf Whittier
No thought of their danger! No mad rush on deck!
They stand at their posts in the hull of a wreck,
Firm hands on the valves; and the white steam appears;
And down with their ship go the brave engineers!
"Stand" by Henry Lawson
Now, master lost 'is 'ead when 'e found 'e couldn't stop,
And 'e pulled a valve or somethin' an' somethin' else went pop,
An' somethin' else went fizzywig, an' in a flash or less,
That blessed car was goin' like a limited express.
"The Groom's Story" by Arthur Conan Doyle

In news:

Are there standards that ensure valves are kept open or closed as needed .
Power comes from the same 24-valve 3.5L DOHC V-6 used in the Trooper and VehiCROSS, but with 230 hp instead of 215.
FE&S eMarketplace: Cast Iron, Steamers, and Drain Valves.
Which is better, heart valve replacement by surgery or catheter .
Which is better: heart valve replacement by surgery or catheter .
All engines rely on the motion of the crankshaft to drive valve timing events.
Because the valve has no output flow, all leakage is confined to the valve's four lands.
Our company is getting low and unpredictable cycle life out of our diaphragm valves.
Basic check valve allows fluid to flow in one direction, in this case from bottom to top.
Show valves that are held actuated by a machine member in their shifted condition, and.
Carl's heart surgery six years ago left him with a leaky heart valve.
0The Lorenz discharge valve is manufactured with heavy-duty 3/16-in.
7-year-old actor in 'mini-Darth Vader' Volkswagen Super Bowl ad recovering after heart-valve -replacement surgery.
The Food and Drug Administration said Monday that the heart valve compared favorably to surgery after one year.
The new valves will be introduced to the market place at the Valve World Exhibition to be held in Düsseldorf at the end of November.
***

In science:

We consider a spin valve device consisting of an extended graphene sheet (that defines the x − y plane) contacted by two ferromagnetic electrodes. A gate voltage Vg applied on graphene shifts the Dirac point away from the zero energy.
Laser-assisted spin-polarized transport in graphene tunnel junctions
The graphene spin valve device is sensitive to the electromagnetic radiation.
Laser-assisted spin-polarized transport in graphene tunnel junctions
The control solenoid valve itself has a lower resistance to the flow.
Performance of a cryogenic system prototype for the XENON1T Detector
Figures 2a and 2b show the schematic structure and scanning electron microscopy (SEM) image of the lateral spin valve with the NiPd middle wire.
The spin Hall effect as a probe of nonlinear spin fluctuations
This absorption is confirmed by a reduction of the nonlocal spin valve (NLSV) signal detected at the second Py electrode Py2, as detailed in refs. 15 and 16.
The spin Hall effect as a probe of nonlinear spin fluctuations
Electrical detection of spin precession in a metallic mesoscopic spin valve.
The spin Hall effect as a probe of nonlinear spin fluctuations
For a flag f, the valency of the corresponding special point is denoted by val(f ) and the restriction of val to T (v) is denoted by valv .
Degeneration of curves and analytic deformation
The type of the action σ on C is defined by the collection T = (rv (v ∈ V (τ )), valv (f )(f ∈ T (v)))v .
Degeneration of curves and analytic deformation
We maintained a Rb vapor in the chamber by slightly opening a valve between the chamber and a Rb cold finger.
Loading a vapor cell magneto-optic trap using light-induced atom desorption
This odd-even effect, in fact, has been experimentally seen, and perhaps could be instrumental in constructing a spin-valve using these wires.
Transport in quantum wires
Qubit measurement could be done using a spin-valve tunneling barrier between the quantum dot and an auxiliary dot.
Experimental Quantum Computation with Nuclear Spins in Liquid Solution
Finally, circularly polarized laser light has been used to create spin polarization in the coherence time measurements [KA98]. or a variety of materials in the Spin-filters (or spin-valves) have been first demonstrated f 70’s [TM73].
Experimental Quantum Computation with Nuclear Spins in Liquid Solution
Promising elements based on the multilayer superconductor-ferromagnet structures (SF systems), such as the F SF spin valve, Josephson SF S π-junction, and others, were also been suggested and studied.
Proximity Effect and Spontaneous Vortex Phase in Planar SF-Structures
This valve is capable of pulses as short as 10 µs FWHM, and produces intensities of 1024 atoms/sr/s.
Stopping Supersonic Beams with an Atomic Coilgun
While the first beams were continuous, the method was later extended by using pulsed valves with short opening times [43, 44].
Preparation and manipulation of molecules for fundamental physics tests
***