303:
compact size, and greatly mitigated risk of explosion in the event that flammable liquids and/or vapors are present. Additionally, unlike many mechanical pumps, they can also pass debris as the eductor has no moving parts that can be fouled. This makes an eductor especially useful in situations where fitting a debris strainer to the suction port will present more issues than it resolves. The size of the debris that can be passed depends on the physical size of the eductor. Sizes, flow ratings, and applications vary, including eductors that are permanently installed (typically used in very large spaces, such as a ship's main engine room), or portable models that can be lowered into spaces by a rope and supplied and drained through firefighting hoses. Most are supplied through a ship's firefighting main, and portable models can also be supplied by an emergency pump, provided it can supply sufficient flow to operate the eductor.
389:. This ejector is similar in operation to the steam ejector but uses high-pressure air as the working fluid. Multistage air ejectors can be used, but since air cannot easily be condensed at room temperature, an air ejector is usually limited to two stages as each subsequent stage would have to be significantly larger than the last. These are commonly used in pneumatic handling equipment when a small vacuum is required to pick up objects since compressed air is often already present to power other parts of the equipment. Air ejectors used to suction liquids directly will produce a fine mist of droplets, this is how
361:. A vacuum ejector uses steam pressure to draw air out of the vacuum pipe and reservoirs of continuous train brake. Steam locomotives, with a ready source of steam, found ejector technology ideal with its rugged simplicity and lack of moving parts. A steam locomotive usually has two ejectors: a large ejector for releasing the brakes when stationary and a small ejector for maintaining the vacuum against leaks. The exhaust from the ejectors is invariably directed to the
397:
43:
311:
The industrial steam ejector (also called the "steam jet ejector", "steam aspirator", or "evactor") uses steam as a working fluid and multistage systems can produce very high vacuums. Due to the lack of delicate moving parts and the flow of steam providing somewhat of cleaning action, steam ejectors
298:
by mixing potentially hazardous chemicals into the water stream, then flushing them down a drain that often leads directly to the municipal sewer. Their use has decreased somewhat as small electric vacuum pumps are far more effective, environmentally safe, and have become more affordable, but the
293:
at one side. The flow of water passes through the straight portion of the tee, which has a restriction at the intersection, where the hose barb is attached. The vacuum hose should be connected to this barb. In the past, water aspirators were common for low-strength vacuums in chemistry benchwork.
335:, for example, the second stage provides vacuum for the waste steam output by the first stage. Condensers are typically used between stages to significantly reduce the load on the later stages. Steam ejectors with two, three, four, five and six stages may be used to produce vacuums down to 2.5
302:
Another, much larger version of this device is used in maritime operations as a device to dewater (drain) areas in a ship that have been flooded in emergency situations. Typically referred to as an eductor in these applications, this is preferred over electrical pumps due to their simplicity,
221:
results in it having low pressure, thus generating a vacuum. The outer tube then narrows into a mixing section where the high velocity working fluid mixes with the fluid that is drawn in by the vacuum, imparting enough velocity for it to be ejected, the tube then typically expands in order to
342:
Steam ejectors are also suitable for pumping many liquids since if the steam can be easily condensed into the liquid then there is no need to separate the working fluid or manage a mist of liquid droplets. This is the manner in which a
140:
216:
In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area. The fluid leaving the jet is flowing at a high velocity which due to
225:
The strength of the vacuum produced depends on the velocity and shape of the fluid jet and the shape of the constriction and mixing sections, but if a liquid is used as the working fluid, the strength of the
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have allowed usage of extremely corrosive gasses, since steam ejectors have no moving parts they can be constructed in their entirety from almost any material that has sufficient durability.
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can handle gas flows containing liquids, dust, or even solid particles that would damage or clog many other vacuum pumps. Ejectors made entirely from specialised materials such as
294:
However, they are water-intensive, and depending on what the vacuum is being used for (e.g. solvent removal), they can violate environmental protection laws such as the
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In order to avoid using too much steam or impractical operating pressures, a single steam-ejector stage is generally not used to generate vacuum below approximately 10
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and many other spraying systems operate, but when a spray is not required it is typically an undesirable effect that limits the applications to gas suction.
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If not considering the source of the working fluid, vacuum ejectors can be significantly more compact than a self-powered vacuum pump of the same capacity.
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unmatched simplicity and reliability of this device have caused it to remain popular for small labs or as a backup.
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A brass aspirator. The water inlet and outlet are at the top and bottom, respectively; the air inlet is on the side.
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decrease the velocity of the ejected stream, allowing the pressure to smoothly increase to the external pressure.
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because this is more economical of steam and is only required to operate when the train is moving.
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463:, B. D. Power, New York: Reinhold Publishing Corporation, 1966, chapter 4.
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An additional use for the injector technology is in vacuum ejectors in
331:). To generate higher vacuum, multiple stages are used; in a two-stage
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International
Association of Plumbing and Mechanical Officials (IAPMO)
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254:). If a gas is used, however, this restriction does not exist.
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339:, 300 Pa, 40 Pa, 4 Pa, and 0.4 Pa, respectively.
357:, which were made compulsory in the UK by the
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285:and consists of a tee fitting attached to a
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69:introducing citations to additional sources
1445:Nuclear magnetic resonance (NMR) instrument
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1810:Instruments used in medical laboratories
59:Relevant discussion may be found on the
2896:Plumbing & Drainage Institute (PDI)
1326:Inductively coupled plasma (ICP) device
450:
1374:Transmission electron microscope (TEM)
131:
7:
2846:Mechanical, electrical, and plumbing
456:
454:
234:of the liquid (for water, 3.2
1369:Scanning electron microscope (SEM)
25:
2166:Push-to-pull compression fittings
1414:Thermogravimetric analyzer (TGA)
1224:Nuclear magnetic resonance (NMR)
400:The basic elements of an ejector
355:continuous train braking systems
52:relies largely or entirely on a
41:
359:Regulation of Railways Act 1889
1:
461:High Vacuum Pumping Equipment
2906:World Plumbing Council (WPC)
2457:Reduced pressure zone device
2901:Uniform Plumbing Code (UPC)
2620:Instant hot water dispenser
2422:Piping and plumbing fitting
230:produced is limited by the
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2247:Backflow prevention device
2232:Atmospheric vacuum breaker
32:Aspirator (disambiguation)
29:
2507:Thermostatic mixing valve
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1569:Time-domain reflectometer
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1336:Liquid chromatograph (LC)
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2237:Automatic bleeding valve
1876:Compatibility (chemical)
27:Type of ejector-jet pump
2442:Pressure-balanced valve
2437:Pressure vacuum breaker
2146:Pipe (fluid conveyance)
2088:Drain-waste-vent system
2068:Chemical drain cleaners
1404:Melting-point apparatus
785:Cryogenic storage dewar
2963:Template:Public health
2635:water recycling shower
2605:Hot water storage tank
1936:Onsite sewage facility
1341:Mass spectrometer (MS)
1331:Gas chromatograph (GC)
401:
2948:Fire sprinkler system
2657:Tankless water heater
2600:Garbage disposal unit
2585:Electric water boiler
2057:British Standard Pipe
1716:Acid-resistant gloves
1397:differential scanning
399:
270:The cheap and simple
219:Bernoulli's principle
2999:Laboratory equipment
2647:Storage water heater
2216:Water heat recycling
2124:National Pipe Thread
2026:Water supply network
1293:Analytical chemistry
795:Laminar flow cabinet
501:Laboratory equipment
274:is commonly used in
65:improve this article
30:For other uses, see
2978:Template:Wastewater
2836:Hydrostatic testing
2477:Rooftop water tower
2073:Compression fitting
1665:Personal protective
574:Meker–Fisher burner
377:Commonly called an
134:
2932:Waterborne disease
2831:Hydronic balancing
2590:Evaporative cooler
2555:Accessible bathtub
2452:Radiator (heating)
2432:Pressure regulator
2327:Double check valve
2302:Concentric reducer
2103:Garden Hose Thread
1996:Thermal insulation
1866:Air gap (plumbing)
1508:Function generator
1491:Bench power supply
1430:Analytical balance
1191:Ostwald viscometer
1186:Graduated cylinder
925:Inoculation needle
402:
170:Vacuum generation,
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2968:Template:Sewerage
2915:Health and safety
2891:NSF International
2701:Specialized tools
2580:Drinking fountain
2547:Plumbing fixtures
2427:Plug (sanitation)
2412:Nipple (plumbing)
2332:Eccentric reducer
2312:Coupling (piping)
2277:Chemigation valve
2130:Nominal Pipe Size
2093:Ductile iron pipe
1991:Thermal expansion
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976:Soxhlet extractor
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885:Pipeclay triangle
637:Mortar and pestle
205:, which produces
191:
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153:Eductor-jet pump,
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16:(Redirected from
3011:
2973:Template:Toilets
2738:Flare-nut wrench
2497:Submersible pump
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632:Magnetic stirrer
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209:by means of the
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2307:Condensate pump
2287:Circulator pump
2267:Butterfly valve
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2191:Solvent welding
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2006:Trap (plumbing)
1981:Surface tension
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1484:Control devices
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714:Extension clamp
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1074:Vacuum (Dewar)
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745:Test tube rack
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720:Funnel support
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627:Liquid whistle
624:
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592:Vacuum dry box
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539:Alcohol burner
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432:External links
430:
429:
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416:Diffusion pump
413:
406:
403:
387:vacuum ejector
374:
371:
308:
305:
267:
264:
262:
259:
232:vapor pressure
211:Venturi effect
195:vacuum ejector
189:
188:
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128:
127:
63:. Please help
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10:
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3005:
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2958:Template:HVAC
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2922:Plumbing code
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2879:and standards
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2791:Control valve
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2728:Drain cleaner
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2397:Hose coupling
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2297:Closet flange
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2209:
2207:
2206:Threaded pipe
2204:
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2199:
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2110:
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2099:
2098:Flare fitting
2096:
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2078:Copper tubing
2076:
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1700:Safety shower
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1610:Wire stripper
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1304:Compositional
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868:
866:
863:
861:
858:
856:
853:
851:
848:
846:Balance brush
845:
843:
840:
838:
835:
834:
832:
828:
822:Weighing dish
821:
819:Weighing boat
818:
816:
813:
811:
808:
806:
803:
801:
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791:
788:
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762:
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748:
746:
743:
741:
738:
735:
733:
730:
727:
725:
722:
719:
716:
713:
711:
710:Burette clamp
708:
706:
703:
701:
698:
695:
694:
692:
686:
684:
681:
678:
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674:
668:
665:
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623:
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612:
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588:
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583:
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577:
575:
572:
570:
567:
565:
562:
560:
557:
555:
552:
550:
547:
545:
544:Bunsen burner
542:
540:
537:
536:
534:
528:
525:
524:
521:
517:
510:
506:
502:
495:
490:
488:
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392:
388:
384:
380:
372:
370:
368:
364:
360:
356:
351:
349:
348:
340:
338:
334:
333:steam ejector
330:
326:
321:
319:
315:
307:Steam ejector
306:
304:
300:
297:
292:
288:
284:
281:
277:
273:
265:
260:
258:
255:
253:
249:
245:
241:
238:or 0.46
237:
233:
229:
223:
220:
214:
212:
208:
204:
201:is a type of
200:
196:
187:
182:
179:
177:Related items
175:
169:
165:
157:
152:
148:
141:
136:
124:
113:
110:
106:
103:
99:
96:
92:
89:
85:
82: –
81:
77:
76:Find sources:
70:
66:
62:
56:
55:
54:single source
50:This article
48:
44:
39:
38:
33:
19:
18:Steam ejector
3004:Vacuum pumps
2851:Pipe marking
2824:and services
2820:Professions,
2768:Strap wrench
2708:Basin wrench
2687:Water heater
2682:Water filter
2595:Flush toilet
2570:Dehumidifier
2521:
2512:Trench drain
2492:Street elbow
2482:Safety valve
2467:Relief valve
2407:Needle valve
2392:Grinder pump
2362:Flow limiter
2347:Float switch
2282:Chopper pump
2262:Booster pump
2211:Tube bending
2156:Pipe support
2021:Water hammer
2001:Thermosiphon
1931:Neutral axis
1771:Fire blanket
1709:Eye and hand
1695:Rubber apron
1559:Oscilloscope
1523:Potentiostat
1450:Plate reader
1346:pH indicator
1316:CHN analyzer
1311:AutoAnalyzer
1104:Round-bottom
997:Boston round
860:Filter paper
815:Refrigerator
732:Retort stand
700:Clamp holder
696:Beaker clamp
662:Vortex mixer
657:Stirring rod
652:Static mixer
582:Teclu burner
460:
438:eductors.net
386:
383:Venturi pump
382:
378:
376:
352:
346:
341:
322:
310:
301:
283:laboratories
271:
269:
261:Common types
256:
224:
215:
198:
197:, or simply
194:
192:
162:Venturi pump
160:filter pump,
118:
108:
101:
94:
87:
75:
51:
2796:Flow sensor
2784:and control
2782:Measurement
2773:Tap and die
2748:Pipe wrench
2733:Driving cap
2625:Laundry tub
2502:Tap (valve)
2487:Sewage pump
2472:Riser clamp
2417:Pinch valve
2387:Grease trap
2382:Globe valve
2372:Flushometer
2357:Floor drain
2352:Float valve
2272:Check valve
2257:Bleed screw
2031:Water table
1971:Storm sewer
1857:Fundamental
1759:Other items
1685:Face shield
1532:Measurement
1513:Galvanostat
1473:Electronics
1423:Other items
1409:Thermometer
1392:Calorimeter
1321:Colorimeter
1265:Gas syringe
1248:Other items
1176:Eye dropper
1051:Watch glass
1036:Evaporating
1015:Cold finger
830:Other items
736:Screw clamp
728:Pinch clamp
717:Flask clamp
667:Wash bottle
622:Homogenizer
426:Vacuum pump
379:air ejector
373:Air ejector
250:or 77
246:at 25
203:vacuum pump
186:vacuum pump
150:Other names
2993:Categories
2856:Pipefitter
2743:Pipecutter
2723:Core drill
2610:Humidifier
2575:Dishwasher
2537:Zone valve
2532:Water tank
2377:Gate valve
2252:Ball valve
2225:Components
2045:Technology
2016:Wastewater
1976:Stormwater
1690:Respirator
1631:Test probe
1549:Multimeter
1361:Microscopy
1181:Eudiometer
1145:Separatory
1114:Volumetric
1079:Erlenmeyer
1007:Condensers
971:Dean–Stark
920:Wire brush
880:Microscope
875:Centrifuge
850:Cork borer
805:Petri dish
780:Agar plate
767:Containers
750:Wire gauze
587:Water bath
549:Desiccator
445:References
391:airbrushes
350:operates.
289:and has a
121:April 2024
91:newspapers
2875:Industry
2861:Pipelayer
2718:Borescope
2713:Blowtorch
2652:Sump pump
2186:Soldering
2151:Pipe dope
2114:Hydronics
1986:Tap water
1951:Sewer gas
1916:Heat trap
1911:Greywater
1881:Corrosion
1781:Fume hood
1726:Glove box
1579:Voltmeter
964:Apparatus
953:Glassware
842:Autoclave
837:Aspirator
790:Incubator
724:Iron ring
647:Sonicator
617:Chemostat
559:Hot plate
411:Deaerator
367:crosshead
291:hose barb
276:chemistry
158:/ejector,
133:Aspirator
61:talk page
2941:See also
2927:Scalding
2615:Icemaker
2402:Manifold
1961:Sewerage
1941:Pressure
1896:Fuel gas
1871:Backflow
1859:concepts
1850:Plumbing
1680:Lab coat
1605:Tweezers
1595:Heat gun
1351:pH meter
1260:Bell jar
1140:Dropping
1094:Florence
1084:Fernbach
1046:Syracuse
905:Scoopula
855:Crucible
564:Lab oven
421:Injector
405:See also
363:smokebox
347:injector
318:graphite
181:Injector
156:injector
2866:Plumber
2822:trades,
2763:Plunger
2672:Washlet
2560:Bathtub
2462:Reducer
2292:Cistern
2196:Swaging
2176:Sealant
2052:Brazing
1619:General
1539:Ammeter
1239:Thistle
1196:Pipette
1171:Cuvette
1161:Burette
1130:BĂĽchner
1123:Funnels
1109:Schlenk
1089:Fleaker
1069:BĂĽchner
990:Bottles
910:Spatula
900:Stopper
870:Forceps
770:Storage
687:Holders
607:Shakers
578:Striker
526:Heaters
513:General
280:biology
199:ejector
172:suction
105:scholar
2953:Piping
2662:Urinal
2630:Shower
2136:O-ring
2109:Gasket
1966:Siphon
1956:Sewage
1653:Safety
1255:Beaker
1234:Thiele
1219:Cragie
1214:Drying
1135:Hirsch
1099:Retort
1061:Flasks
1029:Dishes
1020:Liebig
981:Kipp's
895:Splint
705:Tripod
683:Clamps
679:Stands
642:Shaker
604:Mixers
529:Dryers
345:steam
242:or 32
228:vacuum
207:vacuum
107:
100:
93:
86:
78:
2565:Bidet
2527:Valve
2171:Putty
2141:Oakum
2132:(NPS)
2126:(NPT)
2105:(GHT)
2059:(BSP)
1588:Tools
1206:Tubes
1041:Petri
385:, or
112:JSTOR
98:books
2642:Sink
2447:Pump
2036:Well
1926:Leak
1270:Vial
1229:Test
865:File
569:Kiln
329:mmHg
327:(75
314:PTFE
296:RCRA
278:and
244:mbar
167:Uses
84:news
337:kPa
325:kPa
316:or
287:tap
240:psi
236:kPa
67:by
2995::
453:^
381:,
252:°F
248:°C
213:.
193:A
1842:e
1835:t
1828:v
493:e
486:t
479:v
183:,
123:)
119:(
109:·
102:·
95:·
88:·
71:.
57:.
34:.
20:)
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