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US3276384A - Check and priming valve means for self-priming pumping system - Google Patents

Check and priming valve means for self-priming pumping system Download PDF

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Publication number
US3276384A
US3276384A US39328164A US3276384A US 3276384 A US3276384 A US 3276384A US 39328164 A US39328164 A US 39328164A US 3276384 A US3276384 A US 3276384A
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Prior art keywords
valve
fluid
pump
chamber
suction
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Franklin E Boone
Berman Merril
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Edison International Inc
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Worthington Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D9/00Priming; Preventing vapour lock
    • F04D9/004Priming of not self-priming pumps
    • F04D9/005Priming of not self-priming pumps by adducting or recycling liquid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/10Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D9/00Priming; Preventing vapour lock
    • F04D9/007Preventing loss of prime, siphon breakers
    • F04D9/008Preventing loss of prime, siphon breakers by means in the suction mouth, e.g. foot valves
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00Rotary kinetic fluid motors or pumps
    • Y10S415/901Drilled well-type pump

Description

3,276,384 CHECK AND PRIMING VALVE MEANS FOR SELF-PRIMING PUMPING SYSTEM Filed Aug. 31, 1964 Oct. 4, 1966 F. E. BOONE ET AL 2 Sheets-Sheet l J M JET i M EN 9 Ao 7 mm O a mwm N E L ll R Aw K Y N B M Du Cl FIG.

F. E. BOONE ET AL Oct. 4, 1966 CHECK AND PRIMING VALVE MEANS FOR SELF-PRIMING PUMPING SYSTEM Filed Aug. 31, 1964 2 Sheets-Sheet 2 FIG. 4

FRANKLIN E. BOONE MERRlL BERMAN United States Patent 3,276,384 CHECK AND PRIMING VALVE MEANS FOR SELF-PRIMING PUMPING SYSTEM Franklin E. Boone, Arvada, and Merril Berman, Denver,

Colo., assignors to Worthington Corporation, Harrison,

N.J., a corporation of Delaware Filed Aug. 31, 1964., Ser. No. 393,281 3 Claims. (Cl. 103113) This invention presented relates to a self-priming pump system, and more particularly to the relief of air-bound wells and the restoration to prime of the pump in a pumping system by recycling pumpage in exchange for entrapped air in the well.

It is an object of the invention to provide a self-priming means in a pump system, which operates automatically to exchange simultaneously fluid which has passed through the pump, for air entrapped in the pump well.

It is another object of the invention to avoid time lost in inoperativeness of the pump due to loss of prime condition.

It is another object of the invention to avoid the necessity for the intervention of an operator to reprime a pump.

It is another object of the invention to provide a selfpriming means which need not be included as an integral part of the pump in the pumping system, but which may be separate therefrom, and is readily accessible for adjustment or repair.

It is yet another object of the invention to provide a means in a self-priming pumping system which operates to affect the exchange of fluid pumpage passed through the pump, for gaseous accumulations entrapped in the pump well of the pumping system.

It is yet another object of the invention to provide a means for a self-priming pumping system which operates in response to loss of pumpage, to restore the prime condition, speedily, automatically and efficiently, thereby substantially eliminating all periods of inoperativeness.

These objects and advantages as well as other objects and advantages may be attained by the use of the device shown by way of illustration in the drawings in which:

FIGURE 1 is a side elevation with portions thereof in vertical section, of a pumping system having a vertically disposed pump in pumping operation in accordance with the present invention;

FIGURE 2 is a section taken on 22 of FIGURE 1;

FIGURE 3 shows the self-priming means for the pumping system of FIGURE 1 arranged for self-priming operation;

FIGURE 4 is a side elevation with portions thereof diagrammatically illustrated in vertical sections to show a pumping system in accordance with the present invention having a horizontally disposed pump.

When a pump is applied to remove the contents of a tank employed for storage or transportation on land, on water, or in the air, the well in which the pump is operating to withdraw the fluid in the tank may receive air from a number of sources including the pump, and when suflicient air is entrapped in the well to prevent the entry of fluid to be pumped out, the fluid may not rise to the inlet of the pump, and it is necessary to re-prime the pump. If there is no automatic alarm signal announcing the loss of pumpage, considerable delay may ensue until the condition is noticed. The efliciency of the pumping operation therefore is low. Furthermore, the unavailability of an operator or an attendant to re-prime the pump may further contribute to the lack of efliciency of the pumping system. The use of the present invention restores fluid to the well, and relieves the gas in the pump in exchange for fluid received from the outlet side of the pump. It is found that tandem valves operable in response to loss of pumpage in combination with a relief valve effective to 3,276,384 Patented Oct. 4, 1966 discharge gas from the pump well into the outlet side of the pump, is effective to accomplish this object. In this manner, pumps are continuously and automatically restored to prime immediately after the loss of pumpage, and the system operates in a highly efficient manner.

Referring to the drawings, FIGURES l, 2 and 3 show a pumping system in accordance with the present invention embodying a vertical turbine pump 60, which comprises a plurality of centrifugal impeller stages as at 61 mounted on a vertical shaft 62 in turn connected to a motor generally designated 63 for driving the pump.

The pump 60 has a suction inlet 64 which receives fluid from a suction or pump well 65 formed by an outer casing 66 which is entirely closed except at its point of connection with the transfer conduit 67 in communication with the fluid to the pump by the pumping system.

Fluid drawn into the inlet 64 of the pump from the suction or pump well 65 is pumped upwardly from one stage to the next through passages 68 in the respective stages and the fluid is discharged through the pump outlet 69 and connecting conduit 70 to suitable connecting means for leading the fluid to a point of storage or use as may be required.

It will be observed that the pump unit has a skirt 71 at its lower end which extends into close proximity to the lower end of the section or pump well 65 so that the pump will not lose its prime until nearly all the fluid has been drawn from the well.

This type pump and suction well is known for use in draining barges or reservoirs and one of the basic problems in the use of this and other types of pumps is that when entrapped air in large quantities is collected or delivered by the transfer line 67, the delivery of fluid is so reduced that the fluid in the suction or pump well 65 will be rapidly exhausted exposing the suction inlet 64 and the pump will lose suction head; that is, it will have insufficient suction to enable it to recommence pumping fluid. until the suc tion inlet is once again submerged.

In the present pumping system, an automatic self-priming means coacts with the pump and suction well to restore the flow of fluid to be pumped.

This self-priming means as shown in FIGURES l, 2 and 3 include a housing 72 connected to the upper end of the outer casing 66, which forms a chamber 73 in communication with the end of the connecting conduit 70 remote from the discharge outlet 69 of the pump.

The chamber 73 forms a reservoir for fluid being pumped and also acts as a transfer passage to an outlet port 74 in communication with the discharge conduit 75 connected to the housing 72 about the outlet port 74, as is shown in FIGURES l and 3 of the drawings.

Flow through the outlet port 74 is controlled by an outlet port valve 77 as is more fully described hereinafter and the fluid delivered to the discharge conduit 75 will be conducted to a point of storage or use.

Chamber 73 is further provided with return ports 78 in substantial alignment with the outlet port 74. A return conduit 79 connected at one end of the housing 72 about the return port 78 and at the other end to the upper end of the outer casing 66 about the return inlet 80 will function to return fluid from the chamber 73 when the return port valve, generally designated 81 is opened.

The return port valve or second valve 81 includes a cylindrical valve housing and valve support 82 dis-posed in the housing 72 and connected about the return port 78. The valve housing and support 82 have a plurality of circumferentially disposed valve ports 83 which will permit fluid to flow from the chamber 73 in housing 72 to the return port 78 when the ports are open. The ports 83 are maintained open or closed by a valve head 84 which is disposed to slide along the inner Wall of the cylindrical valve housing and valve stem support 82.

As is clear from FIGURE 3, the valve head 84 has an annular portion 85 and this portion is connected to the connecting means 86 by spiders 87, so that when the valve head moves to the open or down position, fluid is *free to flow from the chamber 73, through the ports 83, and valve head 84 to the return port 78.

, .The valve 84 isso arranged-with respect to the return port 78, and outlet port 74, that it is in substantial alignment with these ports and with the first or outlet port .valve 77, and this permits them to be connected in tandem by means of a common valve stem 88 which is connected at one end to the first valve 77 and at the end return therefrom to the member 86 of the second valve 81. The valve stem 88 is supportably mounted on the spaced valve 'stem supports 89, 90.

- When the pumping system is not in operation, or when the pump in the system loses its prime, then by action of gravity, the valves automatically take the position shown in FIGURE 3 of the drawings; that is, the first valve 77 is closed and the second valve 81 is opened.

When pump 60 delivers suificient pumpage, then the pressure of the pumped fluid acts to force valve 77 open, .and since they are on a common valve stem 88, the valve head 85 of the second valve 31 slides upwardly to close off the ports 83 therein.

The present invention accomplishes its advantageous results because it provides means for displacing accumulated air or gas from the suction well 65 by exchanging this air.or gas with fluid from the reservoir or chamber 73.

, This is accomplished by a gas relief conduit 91 connected between the upper end of the outer casing 66 forming the suction well 65 and the upper portion of the housing 72. A unidirectional pressure sensitive-check valve 92 diagrammatically illustrated in the conduit 91 acts to .permit gas to be displaced from the suction Well 65 to the upper portion of the chamber 73. Further, it will :benoted that the chamber 73 has suflficient volumetric capacity so that the fluid contained therein will be suflicient to reprime the pump 60 when it displaces the gas from the suction well, as is more fully described hereinafter.

" OPERATION OF PUMPING SYSTEM WITH VERTICAL PUMP When the pump is not in operation, the first valve 77 -and second valve 81 will be in the position shown in .60 will commence discharging fluid through discharge outlet 69, as above described, to the chamber 73 connected thereto by connecting conduit 7 0.

As the fluid in the suction well draws down, it will reduce the pressure therein causing fluid from the tank or reservoir to flow through transfer conduit 67 and maintain the level of the fluid in the suction well so pumping will continue.

The fluid in chamber 73 will be discharged when the pressure is great enough to open the first valve 77. This will automatically close the second valve 81 and hold it closed until the pressure of the pumped fluid fails.

This latter condition will occur when a large quantity of air or gas accumulates or is delivered from the transfer conduit 67.

Such an accumulation of air or gas causes the pump to immediately draw down the remaining fluid in the suction well 65 and the pump loses its suction head and the Well runs dry. As a result, the pressure of the pump fluid is not adequate to hold or force the first valve 77 to an open position and gravity pulls first valve 77 closed automatically and simultaneously opening second valve 81.

When valve 81 opens, the collected fluid in chamber 73 flows back through the port 83, return port 78 and return conduit 79 through the return inlet 80 to the suction well 65 where it displaces the gas in the suction well as .fluid in the chamber prime, automatically upon the it fills that well. It displaces the accumulated air and gases through the gas relief line 91, valve 92 which opens at a predetermined gas-pressure increase.

The air and gas is vented into the upper portion of the chamber 73 in the space formerly occupied by the fluid therein andthus in substance the gas. in the suction well 65 is exchanged for the fluid in the chamber 73.

With suflicient fluid being present, the pump will reprime itself automatically and once again will draw down the fluid in the suction well 65. This, as in start up,'will reduce the pressure in the suction well and draw fluid from the storage vessel (not shown) through the transfer line 67.

So long as the transfer line 67 continues to supply fluid pumping and automatic self-priming will alternate and continue until all the fluid is exhausted from the tank or storage vessel.

ANOTHER FORM OF THE INVENTION FIGURE 4 shows a pumping system in accordance with the present invention employing a horizontal centrifugal type pump. There is a housing defining a chamber 11, which is connected to the pump outlet 12. The conduit 13, shown in FIGURE 4, extends a distance into the chamber 11 suflicient so that the volumetric capacity of the chamber below the level of the top of the conduit 13, contains fluid enough to restore the pump to prime when it flows back to the suction inlet chamber 10. Thus, the top 14 of the conduit 13 is above the level of the floor 15 of the chamber 11. 'A first conduit 16 is connected to the upper portion of the chamber 11. A first valve 17 is located between the first conduit 16 and the chamber 11 The first valve 17 is normally closed when pumpage is not maintained and opens in response to pumpage. The failure of pumpage, permits the first valve 17 to close. A second conduit 18 extends from the bottom of the chamber 11 to the suction inlet chamber 10 and defines a return for pump fluid from the chamber 11. A second valve is located between the chamber 11 and the second conduit 18. This second valve 20 is normally closed. It is operably connected by a rod 21, or other suitable means to the first valve 17. When the first valve 17 closes by reason of failure of pumpage, the second valve 20 is simultaneously and automatically opened by reason of the connectingrod 21. On the other hand, when the pressure of the pumpage causes the first valve 17 to open, in response to pumpage being urged into the conduit 16, the rising of the valve 17 causes the rod 21 to raise the second valve 20 to close the second conduit 18.

When suflicient gaseous matter accumulates at the suction side ofthe pump (inlet chamber 10), so that there is a failure of pumpage, the mere return of fluid from the chamber 11 to the suction inlet chamber 10 must be accompanied by a relief of the air entrapped in the pump that is blocking the restoration of the priming fluid. To this end, a third conduit 23 connected between the upper portion of the chamber 11 and the pump 22, is provided. A third valve 24 is located in this conduit. The third valve 24 is normally closed when pumpage is passing through the chamber. This valve opens in response to gas pressure. The gaseous matter entrapped in the pump escapes into the chamber 11 from the pump 22, while the 11 is returning into suction inlet chamber 10 of the pump 22. The tandem operation of the first and second valves in returning pumpage into the suction inlet chamber 10 in cooperation with the gas relief valve 24, have effectively restored the pump to failure of pumpage. The tandem valves 17 and 20 are substantially coaxial and are operated together by the connecting rod 21 in response to pumpage or gravity. The foregoing description in drawings is intended as What is claimed is:

1. In a self-priming liquid pumping system:

(a) a suction well connected to a source of fluid to be pumped (b) multi-stage pump means for pumping fluid from said suction well operatively supported in said suction well and disposed to form therewith an annular chamber about the pump adapted to receive the fluid to be pumped (c) a housing forming a chamber (d) at least one stage at the lower end of the pump means having its suction disposed to communicate with fluid to be pumped from the annular chamber and at least one stage of said pump means connected to the housing to discharge pumped fluid to the chamber in said housing (e) the chamber in said housing having a discharge port for fluid delivered thereto in the upper portion and a return port in the lower portion thereof (f) a normally closed valve for the discharge port to be actuated to an open position by the discharge pressure of the fluid being pumped (g) a normally open valve for the return port,

(h) means operatively connecting the discharge port valve and the return port valve whereby when the discharge port valve is actuated to an open position by the discharge pressure of the fluid being pumped the return port valve will be automatically closed (i) a return conduit connected between the housing and the suction Well to permit fluid to flow from said return port to the annular chamber in the suction well when the return port valve is in open position (j) a gas relief conduit connected between the suction Well and the housing to permit gases to pass from the annular chamber to the chamber in the housing,

(k) a normally closed valve means in said relief conduit operable to control the passage of gases from the annular chamber in the suction well to the chamber in the housing,

(I) said relief conduit valve means to be actuated to an open position by the pressure of the gases in said annular space established by the action of priming fluid being returned to said annular chamber through the return conduit when the discharge pressure of the fluid being pumped is insufficient to maintain the discharge port valve in an open position.

2. In the self-priming liquid pumping system as claimed in claim 1, wherein:

References Cited by the Examiner UNITED STATES PATENTS 2,902,940 9/1959 Meyer et al. 1031 13 FOREIGN PATENTS 995,383 10/1951 France.

MARK NEWMAN, Primary Examiner.

HENRY F. RADUAZO, Examiner.

Claims (1)

1. IN A SELF-PRIMING LIQUID PUMPING SYSTEM: (A) A SUCTION WELL CONNECTED TO A SOURCE OF FLUID TO BE PUMPED (B) MULTI-STAGE PUMP MEANS FOR PUMPING FLUID FROM SAID SUCTION WELL OPERATIVELY SUPPORTED IN SAID SUCTION WELL AND DISPOSED TO FORM THEREWITH AN ANNULAR CHAMBER ABOUT THE PUMP ADAPTED TO RECEIVE THE FLUID TO BE PUMPED (C) A HOUSING FORMING A CHAMBER (D) AT LEAST ONE STAGE AT THE LOWER END OF THE PUMP MEANS HAVING ITS SUCTION DISPOSED TO COMMUNICATE WITH FLUID TO BE PUMPED FROM THE ANNULAR CHAMBER AND AT LEAST ONE STAGE OF SAID PUMP MEANS CONNECTED TO THE HOUSING TO DISCHARGE PUMPED FLUID TO THE CHAMBER IN SAID HOUSING (E) THE CHAMBER IN SAID HOUSING HAVING A DISCHARGE PORT FOR FLUID DELIVERED THERETO IN THE UPPER PORTION AND A RETURN PORT IN THE LOWER PORTION THEREOF (F) A NORMAL CLOSED VALVE FOR THE DISCHARGE PORT TO BE ACTUATED TO AN OPEN POSITION BY THE DISCHARGE PRESSURE OF THE FLUID BEING PUMPED (G) A NORMALLY OPEN VALVE FOR THE RETURN PORT, (H) MEANS OPERATIVELY CONNECTING THE DISCHARGE PORT VALVE AND THE RETURN PORT VALVE WHEREBY WHEN THE DISCHARGE PORT VALVE IS ACTUATED TO AN OPEN POSITION BY THE DISCHARGE PRESSURE OF THE FLUID BEING PUMPED THE RETURN PORT VALVE WILL BE AUTOMATICALLY CLOSED (I) A RETURN CONDUIT CONNECTED BETWEEN THE HOUSING AND THE SUCTION WELL TO PERMIT FLUID TO FLOW FROM SAID
US3276384A 1964-08-31 1964-08-31 Check and priming valve means for self-priming pumping system Expired - Lifetime US3276384A (en)

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DE19651528889 DE1528889A1 (en) 1964-08-31 1965-08-06 Arrangement to restore the absorbency of a pump

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370604A (en) * 1964-12-16 1968-02-27 Hudson Eugineering Company Self-priming liquid pumping system and primer valve
US3381618A (en) * 1967-04-10 1968-05-07 Hudson Eng Co Self-priming system for horizontal pumps
US3425436A (en) * 1966-06-10 1969-02-04 Hudson Eng Co Valve structure for self-priming pumps
US3434430A (en) * 1967-04-18 1969-03-25 Worthington Corp Self-priming pump system with external actuating means
US3474735A (en) * 1967-05-24 1969-10-28 Samuel E Gilmore Air dumping control mechanism for self-priming pumps
US3481274A (en) * 1967-12-18 1969-12-02 Hudson Eng Co Differential pressure sensitive valve system for self-priming liquid-type pumps
US3723019A (en) * 1971-05-21 1973-03-27 Worthington Corp Means to overcome low flow problems of inducers in centrifugal pumps
US3726618A (en) * 1971-04-05 1973-04-10 Pump J Co Self-priming pump
US3854848A (en) * 1971-10-07 1974-12-17 Laing Nikolaus Device for preventing back-flow in centrifugal pumps operating in parallel
US4552512A (en) * 1983-08-22 1985-11-12 Permutare Corporation Standby water-powered basement sump pump
DE3623096A1 (en) * 1985-07-10 1987-02-19 Iwaki Co Ltd Self-priming pump
US4834621A (en) * 1987-11-24 1989-05-30 Apco/Valve And Primer Corporation Air throttling valve for submerged pump system
EP0554706A1 (en) * 1992-02-01 1993-08-11 Helga geb. Altenau Löffeld Method and device for feeding a fluid
US5795127A (en) * 1995-10-20 1998-08-18 Tecumseh Products Company Vertical shaft self-priming centrifugal pump
GB2390119A (en) * 2002-04-12 2003-12-31 Baker Hughes Inc Priming mechanism for a submersible pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR995383A (en) * 1945-02-22 1951-11-30 Bernard Moteurs Improvements to devices for automatic priming centrifugal pumps
US2902940A (en) * 1953-05-12 1959-09-08 Atkinson Guy F Co Self-priming pumping system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR995383A (en) * 1945-02-22 1951-11-30 Bernard Moteurs Improvements to devices for automatic priming centrifugal pumps
US2902940A (en) * 1953-05-12 1959-09-08 Atkinson Guy F Co Self-priming pumping system

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370604A (en) * 1964-12-16 1968-02-27 Hudson Eugineering Company Self-priming liquid pumping system and primer valve
US3425436A (en) * 1966-06-10 1969-02-04 Hudson Eng Co Valve structure for self-priming pumps
US3381618A (en) * 1967-04-10 1968-05-07 Hudson Eng Co Self-priming system for horizontal pumps
US3434430A (en) * 1967-04-18 1969-03-25 Worthington Corp Self-priming pump system with external actuating means
US3474735A (en) * 1967-05-24 1969-10-28 Samuel E Gilmore Air dumping control mechanism for self-priming pumps
US3481274A (en) * 1967-12-18 1969-12-02 Hudson Eng Co Differential pressure sensitive valve system for self-priming liquid-type pumps
US3726618A (en) * 1971-04-05 1973-04-10 Pump J Co Self-priming pump
US3723019A (en) * 1971-05-21 1973-03-27 Worthington Corp Means to overcome low flow problems of inducers in centrifugal pumps
US3854848A (en) * 1971-10-07 1974-12-17 Laing Nikolaus Device for preventing back-flow in centrifugal pumps operating in parallel
US4552512A (en) * 1983-08-22 1985-11-12 Permutare Corporation Standby water-powered basement sump pump
DE3623096A1 (en) * 1985-07-10 1987-02-19 Iwaki Co Ltd Self-priming pump
DE3623096C2 (en) * 1985-07-10 1991-11-21 Iwaki Co. Ltd., Tokio/Tokyo, Jp
US4834621A (en) * 1987-11-24 1989-05-30 Apco/Valve And Primer Corporation Air throttling valve for submerged pump system
EP0554706A1 (en) * 1992-02-01 1993-08-11 Helga geb. Altenau Löffeld Method and device for feeding a fluid
US5795127A (en) * 1995-10-20 1998-08-18 Tecumseh Products Company Vertical shaft self-priming centrifugal pump
GB2390119A (en) * 2002-04-12 2003-12-31 Baker Hughes Inc Priming mechanism for a submersible pump
US6684946B2 (en) 2002-04-12 2004-02-03 Baker Hughes Incorporated Gas-lock re-prime device for submersible pumps and related methods
GB2390119B (en) * 2002-04-12 2005-08-31 Baker Hughes Inc Gas-lock re-prime device for submersible pumps

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