US3181553A - Production and utilization of vacuum - Google Patents

Production and utilization of vacuum Download PDF

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Publication number
US3181553A
US3181553A US816131A US81613159A US3181553A US 3181553 A US3181553 A US 3181553A US 816131 A US816131 A US 816131A US 81613159 A US81613159 A US 81613159A US 3181553 A US3181553 A US 3181553A
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Prior art keywords
float
liquid
valve
vessel
vacuum
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Expired - Lifetime
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US816131A
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English (en)
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Liljendahl Sven Algot Joel
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
    • F04F5/08—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids the elastic fluid being entrained in a free falling column of liquid
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
    • E03C1/28—Odour seals
    • E03C1/298—Odour seals consisting only of non-return valve
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
    • E03F1/006—Pneumatic sewage disposal systems; accessories specially adapted therefore
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/402—Distribution systems involving geographic features
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/6851—With casing, support, protector or static constructional installations
    • Y10T137/6966—Static constructional installations
    • Y10T137/6969—Buildings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7287—Liquid level responsive or maintaining systems
    • Y10T137/7313—Control of outflow from tank
    • Y10T137/7316—Self-emptying tanks
    • Y10T137/7319—By float

Definitions

  • the present invention is concerned primarily with the problem of utilizing the potential energy of a liquid for the direct production of vacuum within a closed vessel.
  • One object of the invention is to provide an improved hydraulically operated gas pump of the kind in which iquid is introduced batchwise into the top end of a standpipe or standpipes so as to form therein spaced successive liquid bodies or plugs filling out the cross-sectional area of said pipe or pipes and removing between them gas from an enclosure communicating with said standpipe or standpipes.
  • a particularly important object of the invention is to provide a hydraulic gas pump of the kind referred to which, without reduction of its efiiciency, can be designed for high pumping capacity, i.e. with a standpipe or standpipes of substantial cross-sectional area, for instance for use of the potential energy of high natural heads of water.
  • a further object of the invention is to provide a hydraulic air pump of a simple construction in which the potential energy of waste or sewage water discharged from the upper floors of a building into a sewer or any other outlet conduit can be utilized for producing a vacuum.
  • Another object of the invention is to utilize a vacuum produced in this or in any other way for sucking domestic sewage onward through substantially horizontally disposed conduit sections, t-hus eliminating the usual require ment for a steep slope towards the outlet end of such conduit sections, and enabling the conduits concerned to be narrower than has been possible before.
  • a hydraulically operated gas pump particularly a vacuum pump, in which liquid is introduced batchwise into the top end of a standpipe so as to form therein spaced successive liquid plugs completely filling out the cross-sect-ional area of the pipe and adapted to carry away between them gas withdrawn from an enclosure communicating with the standpipe, wherein, for controlling the amount of liquid supplied to the standpipe in each batch, the standpipe is provided at its top end with a valve adapted to open and close periodically, and a branch pipe communicating with the enclosure to be evacuated is connected to the stand-pipe downstream of said valve.
  • FIGURES l, 2 and 3 show diagrammatically one embodiment of hydraulic gas pump according to the invention in different stages of its operating cycle
  • FIGURE 4 illustrates diagrammatically a modified hydraulic gas pump
  • FIGURE 5 shows a vertical section through a hydraulic gas pump comprising a closed float vessel and an influent inlet connected thereto and containing a float-controlled cut-off valve;
  • FIGURE 6 shows a vertical section through a building in which a plurality of vacuum-producing apparatus ac cording to FIGURE 5 are installed, such apparatus being adapted to be operated by sewage supplied from the overlying floors;
  • FIGURE 7 is a diagrammatic vertical section through apparatus for producing vacuum utilizing the potential energy of a natural water basin or stream.
  • FIGURE 8 is a side view of a valve assembly useful in the pump arrangement of FIGURE 5.
  • numeral 10 designates an open-topped vessel or receptacle communicating through a central bottom opening with a substantially vertical standpipe 11, the bottom end of which is submerged below the surface of a water pool 12.
  • a float 13 Disposed in the receptacle 10 is a float 13 formed at its bottom end with a conical valve member 14 adapted, when the float is in its lowermost position, to rest on a conical valve seat 15 formed around the bottom opening of the float vessel 10.
  • the float 13 is slidably guided in the float vessel by guide ribs 16 provided on the inner wall surface of the vessel.
  • Numeral l7 designates an inlet through which water or any other liquid is fed continually or batchwise into the float vessel.
  • a branch pipe 18 which cornmunicates with a closed vessel or enclosure (not shown) of comparatively large capacity and in which a vacuum is to be maintained.
  • a non-return valve 19 Inserted in the branch pipe 18 adjacent to the standpipe 11 is a non-return valve 19 which opens towards the standpipe so as to permit the flow of air from the enclosure into the standpipe, but prevent the flow of air or Water from the standpipe into the enclosure.
  • the vacuum-producing apparatus described operates as follows.
  • a certain degree of vacuum is assumed to prevail within the large closed vessel with which the branch pipe 18 communicates. Consequently, a liquid column 20 of the height h is established in the standpipe 11.
  • the float vessel It is assumed to be only partially filled with liquid, so that the float 13 will be in its lowermost position in which the bottom opening of the float vessel is closed.
  • Liquid from the float vessel It) will now rapidly flow into the standpipe 11, whilst forming therein a liquid plug or piston 21 completely filling out the cross-sectional area of the standpipe.
  • the inflow is initially accelerated by the vacuum prevailing in the standpipe 11 above the liquid column 20.
  • the liquid plug 21 drops deeper down the standpipe 11 at an accelerated velocity, the pressure of the volume of air, 22, trapped between the liquid plug 21 and the liquid column 20 will be increased, thus causing the liquid column 2%) to begin to fall within the standpipe 11.
  • vacuum producer described resides, of course, in that the liquid supplied in metered quantities from the float vessel into the .standpipe will actually fill out the cross-sectional area of the s-tandpi'pe and will. drop down through this pipe as a perfectly integral liquid plug which forms a sealing partition, between the vacuum enclosure and: the
  • a tilting vessel 23 known per se,.is mounted on the top of the float 13.
  • This vessel is tiltable about a horizontal pivot axis 24' and comprises two identical pockets 25 and 26 symmetrically disposed relative to the, tilting axis. Either of the pockets 25, 26 is always positioned below a spout 27 through which a suitably metered small proportion of the amount of liquid supplied through the inlet'pipe 17. is allowed to flow into said pocket.
  • the rate of outflow through the spout 27 i is suitably metered in such a way as to cause the pocket to be completely filled immediately before the liquid Within the float vessel 10 has reached a level at which the lift exerted onthe float is just ,suflicient, to outweigh 7 rapid rate thus completely opening the passageway be- Valve 14, 1-5 controlling the liquid discharge into the pipe 7 to be maintained submerged in the liquidwithin the float vessel 10.
  • the vessel 23 will tilt, thus dischargingthe liquid gathered inthis pocket into the float vessel 10 whilst simultaneously positioning the other pocket, e.-g. pocket 25', beneath thev spout.
  • the emptying of the pocket 26 will cause a sudden decrease of the downward force acting on the float 13' by the weight of the liquid quantity thus discharged, and at the same time 'a sudden increase in the. liquid level within the float vessel will occur.
  • the float will move upwardly at a tween the float vessel. 10v and the standpipe 11.
  • the vacuum producer illustrated in said figure is thus intended primarily for utilizing the potential energy of bath water, slops and other dirty water let out into a sewerage system from the upper floors of a building.
  • the float vessel is provided with a tight-fitting cover 29 so that the interior of the vessel is hermetically enclosed and thus separated from the ambient air.
  • the cylindrical wall of the vessel is formed at a short distance beneath the cover 29 with a circumferential row of spaced openings each having connected to it in a gas tight manner a corresponding one of a plurality of liquid inlet pipes 30, which are preferably made of flexible plastic tubing.
  • Each pipe 30 is provided at its opposite end with a normally closed valve, for instance a float-operated valve 31.
  • a cylindrical baffle or skirt 32 Disposed underneath the cover 2? is a cylindrical baffle or skirt 32 adapted to prevent liquid entering through the respective pipes 30 from impinging on the float 13.
  • the balfle also serves as a guide for the float.
  • FIGURE 8 which illustrates the pressure control valve 34 in the pipe 33, there is included a nipple 78 in which a circumferential valve seating 79 is provided.
  • a non-return valve member in the form of a flap 80 is fixedly attached to a pin 81 rotatable in a projection 82. of the nipple 7%. That portion of the pin 81 which is rot-atably mounted in the projection 82 is of circular cross-section and adapted to provide a seal against the projection.
  • the pin 81 projects on the outside of the projection 32 and has mounted thereon a lever arm 83 that is secured by a pin 84.
  • a weight 85 is attached to the arm 83 and is displaceable therealong to provide an adjustable moment about the pin 81.
  • the weight may be fixed in position by a set screw 86.
  • valve member 89 retains the passage through the nipple 78 closed as long as the pressure difference acting on the valve member produces a clockwise moment about the pin 31 that is less than the counterclockwise moment about the pin produced by the weight 85.
  • the pressure within the float vessel It exceeds that in the branch pipe 18 by an amount suflicient to produce a clockwise moment about the pin 81.
  • the valve member 81 is swung to an open position, allowing the pressure within the housing 10 to be reduced until the valve member swings closed.
  • each liquid inlet pipe 30 comprises, as seen in FIGURE 5, a float housing 35 and, disposed therein, a float 36 mounted for vertical movements within the float housing by being guided between ribs 37 provided therein.
  • a float housing 35 In the lowermost position of the float, as shown in the drawing, its conioally shaped bottom end sealingly engages a correspondingly shaped seating formed at the junction between the housing and a pipe socket 39 to which the above-mentioned plastic tube 30 leading to the float vessel 1! is connected, whilst in its uppermost position the float abuts a distributing plate 41 mounted in spaced relation with the underside of the float-housing cover.
  • the float housing 35 may be connected to the outlet conduit from a wash basin 42 or the like, so that liquid will flow into the float housing and will lift the float when the bottom outlet of the wash basin is opened. Each time this occurs, liquid will be sucked through the conduit 30 into the float vessel 10 of the vacuum producer.
  • the wash basin 42 has been emptied, and the liquid level within the float housing 35 of the cut-off valve 31 has fallen off sufliciently to cause this valve to close, the inflow of liquid into the float vessel 10 is interrupted. As the liquid enters and begins to fill the float vessel 10, a corresponding amount of air is sucked out through the valve 34 whereby the vacuum within the float vessel 10 is maintained substantially constant.
  • the above-described vacuum producer comprising a sealed-off float vessel 10 and a standpipe 11 the lower end of which is immersed into liquid 12 is obviously dependent, for its proper operation, on the maintenance of a certain minimum vacuum value within the vacuum enclosure or tank which is common to a plurality of apparatus and with which the branch pipe 18 communicates.
  • a cut-off valve generally designated by 45 and adapted to close automatically if the vacuum within the float vessel 10 should drop below a predetermined value.
  • the valve 45 is shown in the drawing as a butterfly valve pivoting about the axis 46 and urged towards its closed position by the action of a weight-loaded lever 47.
  • the lever 47 is normally held in a raised position corresponding to the open position of the valve by a piston 48 adapted to slide within a cylinder 49 and connected to the lever by a link 50.
  • the cylinder space above the piston communicates with the air space of the float housing 10 through a pipe 51 whereby, as long as a vacuum of suflicient magnitude exists Within the float housing, the piston is retained in its upper limit position, as shown, whereas, if the air pressure within the float housing should exceed said predetermined value, the piston will descend through its cylinder and thus cause the valve to close.
  • FTGURE 6 illustrates a complete building sewage handling system in which the vacuum produced by utilizing the waste water head is used for the conveyance of the refuse from the water closets through a separate conduit system to a collecting tank under vacuum, whereas the ordinary waste water is conducted to the sewerage system through vacuum production apparatus constructed in accordance with the present invention.
  • numeral 52 designates a vacuum enclosure or tank
  • numeral 53 denotes two vacuum producers of the kind shown in FIGURE 5 and mounted at the second and third floors, respectively
  • numeral 54 denotes a bath tub, 55 a wash stand and 56 a dish-washing sink at the respective floors.
  • Each vacuum producer 53 is connected to the building sewer 57 by an individual standpipe 11, whilst a pipe 58 common floors are connected, through individual float-controlled valves of the kind illustrated in FIGURE 5, to conduits 30 which open into the float vessel 10 of the respective vacuum producers, as shown in FIGURE 5.
  • Thosebath tubs, wash stands and sinks which are installed at the bottom floor may also be similarly connected, by a con?
  • FIGURE 7 illustrates a vacuum producer of the type shown in'FIGURES l to 3, ie having an openrto'pped float vessel, which is arranged for utilizing the, potential energy or head of the water in a high-level natural water reservoir for theproduction of a vacuum within anenclosure, or closed tank. 7 v
  • numeral '10 designates the float vessel or housing
  • numeral 11 the standpip'e,-numeral 12 a lowerrlevelbody of water intowhich said pipe is immersed
  • numeral 18'the branch pipe and numeral 19 the nonrreturn valve inserted therein, adjacent to the stand pipe.
  • the vacuum tank to which the branch pipe 18 connects is designated by 65.
  • Numeral 66 diagrammatically indicates a weir extending, for instance, across a river. Formed through the weir 66, which forms one lateral wall of the float vessel, 10, is an opening 67 which is controllable by a flap 69 pivotable about an axis 68.
  • Inc standpipe 11 which might be inclined at a relatively small angle to the horizontal. and thus may have considerable length, may be 'formed with one or more plug-restoration pockets or loops 77. Similar pockets or loops could of course be associated also with ,the stand-
  • the liquid collected within the .as recited in cla1rn 2 wherein said collecting vessel is a vacuum producer should desirably be stopped, orits rate of operation should at least be reduced.
  • aregulating mechanism comprising a vertical cylinder '70 which is connected at its top end to the vacuum tank through a pipe 71 and in which reciprocates a piston 72 having a pipes'of otherv constructional forms. of the vacuum pump according to the invention.
  • a building sewerage system forcarry ing away waste water comprising waste water receivingrapparatus having an outlet, a hermetically sealed collecting vessel, means for maintaining a sub-atmospheric pressure'in said collecting vessel, conduit means connecting the outlet of said waste water receiving apparatus to said collecting vessel, 2. shutoff valve inserted in said conduit means, means for movwhich waste Water is to be carried a collecting vessel.
  • a line coupling the vacuum enclosure to said collecting vessel through a cut-01f valve whereby a vacuum is produced insaid collecting vessel and is held at a predetermined value.
  • a building sewerage system for-carrying away waste water comprisingwaste water discharging apparatus from which waste water isto be carried, a hermetically sealed pressure exists within the vacuum tank :65, the flap is wide open. 'As the vacuum increases within the tank 65, the piston 72 issucked further into the cylinder 70 pulling at the same time behind it a water column 76 collecting vessel having, an inlet and an outlet, conduit means coupling said inlet of said, collecting vessel to an outlet of said waste water discharging appparatus, a sealed enclosure coupled to the outlet 'of said collect-ing vessel, a first cut-off valve positioned in said conduit means, a second'cut-ofi valve positioned in the outlet of said collecting vessel between the collecting vessel and the point at which the enclosure is coupled to said outlet, means responsive to the discharge of liquid through the outlet of said waste water discharging apparatu for opening said first cut-oil valve, means for opening said second cut-off valve when the liquid in said collecting vessel rises to a first predetermined level, and means
  • pipe means coupling a space above the liquid in said collecting vessel to said enclosure, and valve means positioned within said pipe means for maintaining the pressure in said space in said collecting vessel at a pressure greater than the pressure in said enclosure and less than atmospheric pressure.
  • a building sewerage system for carrying away waste water comprising waste water receiving apparatus having an outlet, a hermetically sealed collecting vessel, means for maintaining a sub-atmospheric pressure in said collecting vessel and for discharging the contents of said collecting vessel, pipe means connecting the outlet of said waste water receiving apparatus to said collecting a vessel, a shut-oil valve inserted in said pipe means, means for moving said shut-olf valve from a closed to an open position in response to the discharge of liquid from said waste water receiving apparatus and to reclose said shutoff valve when said discharge ceases, and an outlet from said collecting vessel, wherein said means for maintaining a sub-atmospheric pressure in said collecting vessel and for discharging the contents of said collecting vessel comprises a downwardly extending discharging standpipe coupled at its upper end to the outlet of said collecting vessel, means for discharging water batchwise from said collecting vessel to form integral plugs of Water completely filling out the cross-sectional area of said standpipe, and pipe means connecting said collecting vesi0 sel to the upper end of said
  • a building sewerage system for carrying away Waste water comprising waste water receiving apparatus having an outlet, a hermetically sealed collecting vessel, means for maintaining a sub-atmospheric pressure in said collecting vessel, pipe means connecting the outlet of said waste water receiving apparatus to said collecting vessel, a shut-off valve inserted in said pipe means, said shutoff valve comprising a float disposed in a hermeticallysealed float housing through which the discharged waste water flows, mean-s for moving said shut-cit valve from a closed to an open position in response to the discharge of liquid from said waste water receiving apparatus and to reclose said shut-off valve when said discharge ceases, an outlet from said collecting vessel, and means to dis charge the contents of said collecting vessel.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Sewage (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US816131A 1958-05-28 1959-05-27 Production and utilization of vacuum Expired - Lifetime US3181553A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE510058A SE190445C1 (ru) 1958-05-28 1958-05-28

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US (1) US3181553A (ru)
AT (1) AT238658B (ru)
BE (1) BE579095A (ru)
CA (1) CA666657A (ru)
CH (1) CH389520A (ru)
ES (1) ES249699A1 (ru)
FR (1) FR1230696A (ru)
GB (1) GB917313A (ru)
IT (1) IT608840A (ru)
NO (1) NO108956L (ru)
SE (1) SE190445C1 (ru)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463179A (en) * 1965-12-10 1969-08-26 Ceskoslovenska Akademie Ved Apparatus for feeding and measuring a substantially evenly segmentized fluidal medium
US3760837A (en) * 1971-11-18 1973-09-25 Electrolux Ab Apparatus for controlling flow of waste liquid into a pneumatic liquid disposal system
US3777778A (en) * 1972-08-30 1973-12-11 Johnson Service Co Two-position liquid level controller
FR2312607A1 (fr) * 1975-05-28 1976-12-24 Thetford Corp Appareillage pneumatique de transfert de liquides residuaires
JPS556792B1 (ru) * 1970-11-26 1980-02-19
EP0016128A1 (en) * 1978-07-05 1980-10-01 LOFTIN, Douglas, Wayne Device for siphoning water from a ponding area on a flat roof
CN108797719A (zh) * 2018-07-25 2018-11-13 厚力德机器（杭州）有限公司 一种建筑餐厨垃圾回收及真空排污系统

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE328531C (sv) * 1969-02-14 1973-07-23 Gustavsbergs Fabriker Ab Avloppssystem
SE409480B (sv) * 1977-12-14 1979-08-20 Electrolux Ab Sett att transportera avloppsvatten medelst vakuum
DE3337224A1 (de) * 1983-10-13 1985-05-02 Triton Belco AG, 2000 Hamburg Doppelseitig wirkende membranpumpe zur erzeugung von vakuum und foerderung von abwasser
DE3546563C2 (ru) * 1985-07-18 1991-02-28 Harald 2000 Hamburg De Michael

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US263147A (en) * 1882-08-22 Thomas a
US264329A (en) * 1882-09-12 Andee levett
US377681A (en) * 1888-02-07 le mirquand
US439687A (en) * 1890-11-04 Discharge attachment for wash-basins
US482439A (en) * 1892-09-13 liernur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US263147A (en) * 1882-08-22 Thomas a
US264329A (en) * 1882-09-12 Andee levett
US377681A (en) * 1888-02-07 le mirquand
US439687A (en) * 1890-11-04 Discharge attachment for wash-basins
US482439A (en) * 1892-09-13 liernur

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463179A (en) * 1965-12-10 1969-08-26 Ceskoslovenska Akademie Ved Apparatus for feeding and measuring a substantially evenly segmentized fluidal medium
JPS556792B1 (ru) * 1970-11-26 1980-02-19
US3760837A (en) * 1971-11-18 1973-09-25 Electrolux Ab Apparatus for controlling flow of waste liquid into a pneumatic liquid disposal system
US3777778A (en) * 1972-08-30 1973-12-11 Johnson Service Co Two-position liquid level controller
FR2312607A1 (fr) * 1975-05-28 1976-12-24 Thetford Corp Appareillage pneumatique de transfert de liquides residuaires
EP0016128A1 (en) * 1978-07-05 1980-10-01 LOFTIN, Douglas, Wayne Device for siphoning water from a ponding area on a flat roof
EP0016128A4 (en) * 1978-07-05 1980-11-14 Douglas Wayne Loftin DEVICE FOR SUCTIONING COLLECTED WATER FROM A FLAT ROOF.
CN108797719A (zh) * 2018-07-25 2018-11-13 厚力德机器（杭州）有限公司 一种建筑餐厨垃圾回收及真空排污系统
CN108797719B (zh) * 2018-07-25 2023-09-22 厚力德机器（杭州）有限公司 一种建筑餐厨垃圾回收及真空排污系统

Also Published As

Publication number Publication date
BE579095A (ru) 1900-01-01
NO108956L (ru)
CA666657A (en) 1963-07-16
ES249699A1 (es) 1959-12-01
SE190445C1 (ru) 1964-07-07
CH389520A (de) 1965-03-15
AT238658B (de) 1965-02-25
GB917313A (en) 1963-02-06
FR1230696A (fr) 1960-09-19
IT608840A (ru) 1900-01-01

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