US20100031435A1 - Bypass system to control liquid volume - Google Patents

Bypass system to control liquid volume Download PDF

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Publication number
US20100031435A1
US20100031435A1 US12/533,556 US53355609A US2010031435A1 US 20100031435 A1 US20100031435 A1 US 20100031435A1 US 53355609 A US53355609 A US 53355609A US 2010031435 A1 US2010031435 A1 US 2010031435A1
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US
United States
Prior art keywords
volume control
control system
pump
bypass
bypass volume
Prior art date
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.)
Abandoned
Application number
US12/533,556
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English (en)
Inventor
Guy Lemire
François Gamache
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MAAX Bath Inc
Original Assignee
MAAX Bath Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAAX Bath Inc filed Critical MAAX Bath Inc
Priority to US12/533,556 priority Critical patent/US20100031435A1/en
Assigned to MAAX BATH INC. reassignment MAAX BATH INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GAMACHE, FRANCOIS, LEMIRE, GUY
Publication of US20100031435A1 publication Critical patent/US20100031435A1/en
Abandoned legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H4/00—Swimming or splash baths or pools
    • E04H4/12—Devices or arrangements for circulating water, i.e. devices for removal of polluted water, cleaning baths or for water treatment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H33/00—Bathing devices for special therapeutic or hygienic purposes
    • A61H33/0087—Therapeutic baths with agitated or circulated water
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H33/00—Bathing devices for special therapeutic or hygienic purposes
    • A61H33/60—Components specifically designed for the therapeutic baths of groups A61H33/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump

Definitions

  • the present invention relates a novel bypass system to control liquid volume. More particularly, the invention relates to a system for use in the control and regulation of pumps, pumping installations and/or systems, and the control of fluid flow in general. This system will find particular, though not exclusive, application with bathing vessels such as pools, whirlpools, bathtubs, hot tubs and spas.
  • Bathing vessels such as spas and hot tubs are very popular and commercially successful. These vessels are water holding enclosures (or reservoirs) that are typically constructed from a molded shell.
  • the molded enclosures include one or more bathing spaces for use by one or more persons, and each bathing space includes at least one jet (or nozzle) from which water can be discharged to produce a relaxing or therapeutic effect.
  • the molded shell may be constructed from fiberglass, plastic or a polymer, or a composite of such materials, in keeping with current technology in the field.
  • One or more pumps are usually placed under the molded shell to draw water from the enclosure and discharge it, sometimes with air, into the enclosure through a plurality of jets of various types.
  • the jets are frequently mounted through the shell in either or both of the floor or sidewall.
  • jets mounted through the sidewall are located below the water line of the bathing vessel and are designed to provide a comforting or therapeutic effect to a person occupying a bathing space.
  • Piping is provided between the various jets, pumps and water inlet ports, and is often comprised of PVC pipes and flexible tubing.
  • Various filters, heaters, cleaning units and diverter valves may also be provided, once again in keeping with known technology.
  • a person occupying a bathing space within a bathing vessel can orient himself in a selected position relative to the one or more jets to receive a vigorous or therapeutic massage action.
  • the bathing vessel has only one setting through which water flow through the jets can be regulated. This is a disadvantage for a bather who may wish to adjust the velocity or flow of water that is discharged through the jets of the bathing vessel.
  • the present invention seeks to meet this and related needs.
  • the present invention relates to a bypass system to control water flow in a water holding enclosure, including bathing vessels such as pools, whirlpools, baths, spas and hot tubs.
  • the system relies on the use of at least one bypass plumbing loop as well as a valve to control water flow through the water holding enclosure.
  • the bypass system includes a pump water inlet, at least one pump water outlet operably connected to said bypass water inlet and capable of releasing water under pressure passing from said inlet to said pump water inlet and a pump for pumping said water received from said water inlet to said water outlet.
  • the pump can be an axial flow pump or any pumping device suitable for the purposes sought.
  • bypass loop generally has a lesser overall length than the main reservoir loop.
  • the invention may further include a plumbing connection (or “bridge” element) that extends from the bypass loop to the reservoir or bathing vessel.
  • the controlled-flow valve allows varying volumes of water or fluid to be directed through the main reservoir loop and the bypass loop. This in turn affects the pressure of the fluid as it is released or discharged through the jets of a bathing vessel, resulting in an effect that can be adjusted in accordance with the bather's needs or desires.
  • a control valve has been positioned at the junction of the main and bypass loops or piping systems for further control of the volume flow.
  • FIG. 1 is a diagrammatic view of a bypass system that is based on the teachings of the prior art
  • FIG. 2 is a diagrammatic view of a first embodiment of a bypass system in accordance with the present invention
  • FIG. 3 is a diagrammatic view of a second embodiment of a bypass system in accordance with the present invention.
  • FIG. 4 is a diagrammatic view of a more intricate bypass system based on that shown in FIG. 1 ;
  • FIG. 5 is a diagrammatic view of a third embodiment of a bypass system in accordance with the present invention.
  • FIG. 6 is a diagrammatic view of a fourth embodiment of a bypass system in accordance with the present invention.
  • FIG. 7 is a diagrammatic view of a fifth embodiment of a bypass system in accordance with the present invention.
  • jet or “fluid jet” refers to an orifice or nozzle through which a fluid such as water may be pumped, discharged or dispensed into a fluid enclosure such as a bathing vessel.
  • the term “bathing vessel” refers to a water or liquid enclosure such as a pool, whirlpool, bath, spa, hot tub and the like. Bathing vessels are adapted to contain a fluid such as water and include one or more bathing spaces to be occupied by at least one person. Each bathing space includes one or more jets through which water is expelled while the bathing vessel is in use. The jets may be provided in various shapes and sizes to produce a variety of beneficial (i.e., therapeutic, relaxing, massaging, etc.) effects.
  • FIG. 1 shows a bypass system that is in keeping with the teachings of the known prior art: See, for example, European Patent Publication No. 0 268 941 A1 (Jacuzzi Europe Spa) and German Patent Publication No. DE 42 30 723 A1.
  • the bypass system generally represented by the numeral 10 , is configured within a bathtub or reservoir 100 .
  • the bypass system 10 includes a main loop 20 that circulates water through the bathtub or reservoir 100 and a bypass loop 30 , both of which are connected to a pump 2 .
  • At least one water inlet 4 is operably connected to the pump 2 through at least one water outlet 6 and in this way is capable of releasing water under pressure passing from said inlet 4 to said water outlet 6 via said pump 2 .
  • the pump can be an axial flow pump or any pumping device suitable for the purposes sought.
  • pumps that are suitable for the present invention include pumps having brush or brushless motors that run either direct or alternate current (DC or AC).
  • the motors may be of either the single or multiphase type
  • An example of a pump that is suitable for the present invention is a water-cooled type, such as a Syllent pump (Mondial Inc.). This type of motor is significantly quieter than traditional motors, an important consideration for the purposes of the present invention.
  • the system shown in FIG. 1 further includes a valve 8 which serves to control the flow of water or fluid circulating through the bypass loop 30 .
  • a valve 8 which serves to control the flow of water or fluid circulating through the bypass loop 30 .
  • the valve that is selected may be manually adjusted by the bather, or alternatively, it may be electronically controlled either directly or indirectly, as known in the art.
  • the flow can even be set to a chosen rhythm or musical score using, for example, a valve having a combination valve box and valve gate, as described in U.S. Pat. No.
  • valves may be selected from gate, globe, ball or butterfly valves, and they may be operated either manually or electrically. Moreover, these valves can be of different types: Two-way (two-port), three-way (three-port, also called “tri-way”) or multi-way. As may be seen in FIG. 1 , the valve 8 is positioned opposite to the pump 2 in the bypass loop 30 .
  • valve 9 is close to the outlet 6 of the pump 2 at a junction between the main loop 20 and the bypass loop 30 .
  • This valve 9 is a three-way valve which can divert, in different percentages, the liquid to the main loop 20 or the bypass loop 30 .
  • FIG. 3 which shows a second embodiment of the present invention
  • the valve 9 is close to the inlet 4 of the pump 2 at a junction between the main loop 20 and the bypass loop 30 .
  • This valve 9 is also three-way valve which can divert, in different percentage, the liquid to the main loop 20 or the bypass 30 .
  • the advantage of the configuration of this system is that even if the valve is in the intake side of the pump, the pump remains filled with liquid at all times, with the result that the efficiency or the cooling of the liquid-cooled motor remains unaffected by variations in water flow.
  • FIG. 4 shows a slightly more intricate arrangement of the bypass system illustrated in FIG. 1 .
  • the bypass system is shown generally by the numeral 10 .
  • the main and bypass loops are represented by the numerals 20 and 30 , respectively.
  • the pump 2 is preceded by an inlet 4 and followed by an outlet 6 , and the valve and reservoir identified by the numerals 8 and 100 , respectively.
  • This arrangement is in effect similar to FIG. 1 , but it includes multiple reservoir inlets.
  • FIG. 5 A third embodiment of the invention is shown in FIG. 5 .
  • the bypass system is represented generally by the numeral 10 .
  • This embodiment very closely resembles the embodiment illustrated in FIG. 2 by having a tri-way valve 9 positioned close to the outlet 6 of the pump 2 .
  • the inlet 4 , main loop 20 , bypass loop 30 and reservoir 100 are approximately in the same positions as in FIG. 2 .
  • An additional element of flow control has been introduced by including a second valve 8 in a new plumbing connection (or “bridge” element) 40 that has been established between the reservoir 100 and the bypass loop 30 .
  • This in effect allows an unlimited number of possibilities for varying the quantity of liquid entering the reservoir 100 .
  • the liquid inlet 40 in the reservoir 100 can supply a different function in the reservoir and have different pressure while still being supplied by only one pump.
  • a variation of this embodiment would involve repositioning and replacement of the second valve 8 , which is a two-way valve, by a valve 9 , which is a three-way valve, at the junction between the additional plumbing connection and the bypass (or parallel piping) system, as shown in FIG. 7 .
  • the bypass system is represented generally by the numeral 10 .
  • the tri-way valve 9 is positioned opposite to the pump 2 in the bypass loop 30 .
  • This tri-way valve 9 also has a plumbing connection (or “bridge” element) 40 toward the reservoir 100 .
  • a different element of flow control has been introduced by including this tri-way valve 9 .
  • the liquid inlet 50 extending from the plumbing connection 40 to the reservoir 100 can be used for a different function or purpose in the reservoir. This is useful when there are accessories other than jets in the bathing vessel, for example, that need to be activated.
  • This liquid inlet 50 can be regulated so that it has a different pressure than the other liquid inlet(s) in the bathing vessel.
  • the bathing system as a whole still derives its power through the use of only a single pump.
  • the embodiments of the invention have the advantage of simplicity. Installing a bypass system as described above can be conveniently done in an existing bathing vessel or in a new one.
  • Features of the invention such as the limited number of components and their ability to be removed from each other in a relatively easy manner, allow for ease of maintenance and replacement.
  • the relative positioning of the valve 8 and pump 2 results in an arrangement that significantly reduces noise levels while the bathing vessel is in use.
  • a further advantage of the bypass system of the present invention resides in the fact that the pump can function with optimal design characteristics (i.e., without the disadvantage or inconvenience of having either an insufficient quantity of water at its inlet or having to build pressure because of reduced size of pipes at the outlet). As a result, the pump's useful lifetime can be extended, which is a desirable feature for those who purchase pools, whirlpools, baths, spas, hot tubs and other similar bathing vessels.
  • a bypass system can be selected to achieve the variations in water flow that are desired by the bather, while minimizing ambient noise.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Rehabilitation Therapy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Architecture (AREA)
  • Epidemiology (AREA)
  • Pain & Pain Management (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Water Supply & Treatment (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US12/533,556 2008-08-06 2009-07-31 Bypass system to control liquid volume Abandoned US20100031435A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/533,556 US20100031435A1 (en) 2008-08-06 2009-07-31 Bypass system to control liquid volume

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US8662408P 2008-08-06 2008-08-06
US12/533,556 US20100031435A1 (en) 2008-08-06 2009-07-31 Bypass system to control liquid volume

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103807158A (zh) * 2014-02-25 2014-05-21 大连理工大学 高压下微小流量连续调节系统
EP3009681A1 (fr) * 2014-10-15 2016-04-20 HILTI Aktiengesellschaft Purge passive et active automatique d'une pompe à eau à amorçage automatique
CN106417638A (zh) * 2016-04-01 2017-02-22 淮南徽旺豆制品设备销售有限公司 一种基于可调节回浆系统液压的腐竹生产装置
CN106417639A (zh) * 2016-04-01 2017-02-22 淮南徽旺豆制品设备销售有限公司 一种基于可调节回浆系统液压的豆腐皮成型装置
ITUA20161751A1 (it) * 2016-03-17 2017-09-17 Sirti Spa Dispositivo invertitore di flusso per la circolazione bidirezionale di un fluido in un circuito.
GB2608476A (en) * 2021-06-29 2023-01-04 Univ Jiangsu Intelligent parallel pumping system and optimal regulating method thereof

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Publication number Priority date Publication date Assignee Title
US4236258A (en) * 1979-04-17 1980-12-02 French Masterpieces, Incorporated Automatic swimming pool cover
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US5151017A (en) * 1991-05-15 1992-09-29 Itt Corporation Variable speed hydromassage pump control
US5153949A (en) * 1988-08-16 1992-10-13 Perfecta Pump Aktiebolag Pump arrangement for hydromassage baths
US5172754A (en) * 1988-10-27 1992-12-22 Graber Neil M Heat exchanger for recovery of heat from a spa or hot tub pump motor
US5408708A (en) * 1993-10-29 1995-04-25 Vico Products Manufacturing Co., Inc. Flow-control for a pump
US5457826A (en) * 1988-12-29 1995-10-17 Toto Ltd. Whirlpool bath with an inverter-controlled circulating pump
US5930852A (en) * 1997-03-21 1999-08-03 Aqua-Flo, Incorporated Heat exchanging pump motor for usage within a recirculating water system
US5983416A (en) * 1996-11-22 1999-11-16 Softub, Inc. Electrically powdered spa jet unit
US6200108B1 (en) * 1998-03-11 2001-03-13 Aqua-Flo, Incorporated Heat exchanging means for a pump motor using a bypass tube within a recirculating water system
US6305036B1 (en) * 1999-01-28 2001-10-23 Ideal-Standard Gmbh & Co. Ohg Process for varying a water flow amount which is supplied to a bathing vessel or fitting and a valve means, especially for executing this process
US6406446B1 (en) * 1998-04-16 2002-06-18 Takagi Industrial Co., Ltd. High velocity current producing apparatus
US6428283B1 (en) * 1999-09-16 2002-08-06 513004 B.C. Ltd. Spa motor cooling method and apparatus
US6681414B1 (en) * 2002-03-04 2004-01-27 May Manufacturing, Inc. Jet flow control for hydrotherapy spa
US6688855B2 (en) * 2001-08-02 2004-02-10 Jan Beckerman Apparatus for increasing water pressure
US20040148693A1 (en) * 2003-02-04 2004-08-05 Perry Anderson Method and device for controlling jet flow intensity for a spa
US6859953B1 (en) * 2002-09-13 2005-03-01 Steven E. Christensen Jet propulsion system for spa or jetted bath using control of air draw to Venturi jets with a three-way air control valve
US6969581B1 (en) * 2004-06-23 2005-11-29 Wagner George E Method and apparatus for restoring and stabilizing motion picture film
US20060045750A1 (en) * 2004-08-26 2006-03-02 Pentair Pool Products, Inc. Variable speed pumping system and method
US7042716B2 (en) * 2003-08-25 2006-05-09 Simon John Edward Shearman Ergonomic pull-out computer housing
US7048518B2 (en) * 2001-07-16 2006-05-23 Eberle Equipamentos E Processos S.A. Pump
US20070114162A1 (en) * 2004-08-26 2007-05-24 Pentair Water Pool And Spa, Inc. Control algorithm of variable speed pumping system
US7327547B1 (en) * 2006-01-20 2008-02-05 Epstein Barry M Circuit element and use thereof
US7329343B1 (en) * 1999-09-10 2008-02-12 Barnes Ronald L Water treatment bypass loops having ozone and chlorine generators
US20080168599A1 (en) * 2007-01-12 2008-07-17 Caudill Dirk A Spa system with flow control feature
US20080189846A1 (en) * 2005-04-04 2008-08-14 Gardenier W John Diverter Valve System for a Spa and a Spa Incorporating Same
US20080298954A1 (en) * 2005-08-08 2008-12-04 Thomas Lincoln Bypass Passage for Fluid Pump

Patent Citations (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236258A (en) * 1979-04-17 1980-12-02 French Masterpieces, Incorporated Automatic swimming pool cover
US4679258A (en) * 1985-11-12 1987-07-14 Henkin Melvyn Lane Hydrotherapy massage method and apparatus
US5153949A (en) * 1988-08-16 1992-10-13 Perfecta Pump Aktiebolag Pump arrangement for hydromassage baths
US5172754A (en) * 1988-10-27 1992-12-22 Graber Neil M Heat exchanger for recovery of heat from a spa or hot tub pump motor
US5457826A (en) * 1988-12-29 1995-10-17 Toto Ltd. Whirlpool bath with an inverter-controlled circulating pump
US5151017A (en) * 1991-05-15 1992-09-29 Itt Corporation Variable speed hydromassage pump control
US5408708A (en) * 1993-10-29 1995-04-25 Vico Products Manufacturing Co., Inc. Flow-control for a pump
US5983416A (en) * 1996-11-22 1999-11-16 Softub, Inc. Electrically powdered spa jet unit
US5930852A (en) * 1997-03-21 1999-08-03 Aqua-Flo, Incorporated Heat exchanging pump motor for usage within a recirculating water system
US6200108B1 (en) * 1998-03-11 2001-03-13 Aqua-Flo, Incorporated Heat exchanging means for a pump motor using a bypass tube within a recirculating water system
US6406446B1 (en) * 1998-04-16 2002-06-18 Takagi Industrial Co., Ltd. High velocity current producing apparatus
US6305036B1 (en) * 1999-01-28 2001-10-23 Ideal-Standard Gmbh & Co. Ohg Process for varying a water flow amount which is supplied to a bathing vessel or fitting and a valve means, especially for executing this process
US7329343B1 (en) * 1999-09-10 2008-02-12 Barnes Ronald L Water treatment bypass loops having ozone and chlorine generators
US6428283B1 (en) * 1999-09-16 2002-08-06 513004 B.C. Ltd. Spa motor cooling method and apparatus
US7048518B2 (en) * 2001-07-16 2006-05-23 Eberle Equipamentos E Processos S.A. Pump
US6688855B2 (en) * 2001-08-02 2004-02-10 Jan Beckerman Apparatus for increasing water pressure
US6681414B1 (en) * 2002-03-04 2004-01-27 May Manufacturing, Inc. Jet flow control for hydrotherapy spa
US6859953B1 (en) * 2002-09-13 2005-03-01 Steven E. Christensen Jet propulsion system for spa or jetted bath using control of air draw to Venturi jets with a three-way air control valve
US20040148693A1 (en) * 2003-02-04 2004-08-05 Perry Anderson Method and device for controlling jet flow intensity for a spa
US7042716B2 (en) * 2003-08-25 2006-05-09 Simon John Edward Shearman Ergonomic pull-out computer housing
US6969581B1 (en) * 2004-06-23 2005-11-29 Wagner George E Method and apparatus for restoring and stabilizing motion picture film
US20060045750A1 (en) * 2004-08-26 2006-03-02 Pentair Pool Products, Inc. Variable speed pumping system and method
US20070114162A1 (en) * 2004-08-26 2007-05-24 Pentair Water Pool And Spa, Inc. Control algorithm of variable speed pumping system
US20080189846A1 (en) * 2005-04-04 2008-08-14 Gardenier W John Diverter Valve System for a Spa and a Spa Incorporating Same
US20080298954A1 (en) * 2005-08-08 2008-12-04 Thomas Lincoln Bypass Passage for Fluid Pump
US7327547B1 (en) * 2006-01-20 2008-02-05 Epstein Barry M Circuit element and use thereof
US20080168599A1 (en) * 2007-01-12 2008-07-17 Caudill Dirk A Spa system with flow control feature

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103807158A (zh) * 2014-02-25 2014-05-21 大连理工大学 高压下微小流量连续调节系统
EP3009681A1 (fr) * 2014-10-15 2016-04-20 HILTI Aktiengesellschaft Purge passive et active automatique d'une pompe à eau à amorçage automatique
WO2016059133A1 (fr) * 2014-10-15 2016-04-21 Hilti Aktiengesellschaft Vidange automatique actif et passif d'une pompe à eau auto-amorçante
JP2017536250A (ja) * 2014-10-15 2017-12-07 ヒルティ アクチエンゲゼルシャフト 自給式水ポンプの能動的及び受動的で自主的な水抜き
US10543621B2 (en) 2014-10-15 2020-01-28 Hilti Aktiengesellschaft Active and passive self-evacuation of a self-priming water pump
ITUA20161751A1 (it) * 2016-03-17 2017-09-17 Sirti Spa Dispositivo invertitore di flusso per la circolazione bidirezionale di un fluido in un circuito.
CN106417638A (zh) * 2016-04-01 2017-02-22 淮南徽旺豆制品设备销售有限公司 一种基于可调节回浆系统液压的腐竹生产装置
CN106417639A (zh) * 2016-04-01 2017-02-22 淮南徽旺豆制品设备销售有限公司 一种基于可调节回浆系统液压的豆腐皮成型装置
GB2608476A (en) * 2021-06-29 2023-01-04 Univ Jiangsu Intelligent parallel pumping system and optimal regulating method thereof
GB2608476B (en) * 2021-06-29 2023-07-19 Univ Jiangsu Intelligent parallel pumping system and optimal regulating method thereof

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Publication number Publication date
CA2674331A1 (fr) 2010-02-06

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