WO1992013195A1 - Safety device - Google Patents

Safety device Download PDF

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Publication number
WO1992013195A1
WO1992013195A1 PCT/AU1992/000020 AU9200020W WO9213195A1 WO 1992013195 A1 WO1992013195 A1 WO 1992013195A1 AU 9200020 W AU9200020 W AU 9200020W WO 9213195 A1 WO9213195 A1 WO 9213195A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
circuit
power
pressure
safety device
Prior art date
Application number
PCT/AU1992/000020
Other languages
French (fr)
Inventor
Geoffrey Raymond Percival
Original Assignee
Jedray Pty. Ltd.
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 Jedray Pty. Ltd. filed Critical Jedray Pty. Ltd.
Priority to AU11780/92A priority Critical patent/AU669326B2/en
Publication of WO1992013195A1 publication Critical patent/WO1992013195A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/022—Stopping, starting, unloading or idling control by means of pressure
    • 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
    • A61H33/005—Electrical circuits therefor
    • 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
    • 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
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/01—Constructive details
    • A61H2201/0173—Means for preventing injuries
    • A61H2201/0176—By stopping operation
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for outboard marine engines

Definitions

  • TECHNICAL FIELD OF THE INVENTION relates to a safety device and in particular but not limited to a safety device for use in conjunction with a pump circuit such as might be used to circulate an operating fluid in a swimming pool, spa bath, air conditioner or the like.
  • Pump circuits used in swimming pools and spa baths are used to recirculate water through a filter.
  • An inlet is employed upstream of the pump which draws water into the pump circuit. Frequently, the inlet can be blocked, say with leaves or it has happened that small children can have limbs or other body parts drawn into the inlet. Where a blockage occurs, the pump can be damaged and/or in the case of a child, the child can be injured.
  • the present invention resides in a safety device including a power shut down unit for shutting down power to a pump in a pump circuit, the shut down unit having an electrical pressure sensor for sensing variations in pressure in the pump circuit and an electrical shut down circuit for shutting down power to the pump in the advent of the sensor detecting an adverse pressure condition in the pump circuit.
  • the invention resides in a pump circuit employing a safety device to shut down power to the pump in the advent of an adverse pressure condition existing in the pump circuit, the pump having an inlet and an outlet connected in the pump circuit so operating fluid can be pumped about the pump circuit, the safety device comprising an electrical pressure sensor for sensing pressure variations in the pump circuit and an electrical power shut down circuit for shutting down power to the pump when an adverse pressure condition is sensed by the pressure sensor.
  • the pressure sensor is located upstream of the pump.
  • two pressure sensors are employed, one upstream and one downstream of the pump. It will also be appreciated that the sensor or other sensors can be located at other locations in the pump circuit.
  • a safety device preferably employs one or more time delay circuits to prevent inadvertent shut down of the power to the pump.
  • a power-up time delay circuit is employed to account for initial pressure variations which might arise at initial power-up of the pump.
  • a pressure variation time delay circuit is preferably used to account for transit changes in pressure by say, an air bubble passing along the circuit.
  • the safety device is used in environments prone to temperature variation which might influence operation of the pressure sensor, it is preferable to employ a temperature compensation circuit to account for current variations brought about by changes in temperature.
  • the safety device is preferably configured for general purpose application inasfar as adjustability of sensed pressure bringing about shut down is concerned.
  • the safety device typically includes high and low limit presettable circuits so that reference pressures can be preset for different applications.
  • FIG. 1 is a schematic diagram illustrating part of a pump circuit employing the teachings of the present invention
  • Figure 2 is a circuit diagram illustrating one preferred embodiment of a safety device according to the present invention
  • Figures 3 and 4 are circuit diagrams illustrating a further embodiment of a safety device according to the invention.
  • Figure 5 is a circuit diagram illustrating a further application of the present invention.
  • a pump circuit 10 employing a safety device 11 to shut down power to a pump 12 in the advent of adverse pressure conditions existing in the pump circuit.
  • the pump circuit includes a pump inlet conduit 13 communicating with an inlet 14 of the pump 12 and an outlet conduit 15 communicating with an outlet 16 of the pump 12.
  • two pressure sensing lines are employed, namely a pump inlet pressure sensing line 17 and a pump outlet pressure sensing line 18.
  • the sensing lines 17 and 18 are coupled to a power shut down control unit 19 which is connected in series with the power supply to the pump along power lines 20 and 21.
  • a power shut down control unit 19 which is connected in series with the power supply to the pump along power lines 20 and 21.
  • pressure is sensed either upstream or downstream of the pump. As long as the pressure either upstream or downstream of the pump remains normal, power to the pump will be maintained by the control unit 19. Should the pressure sensed vary beyond predetermined limits, then power to the pump would be shut down by the control unit 19.
  • the control 19 employs a switching circuit and a typical circuit for a control unit 19 is given in Figure 2.
  • Figure 2 illustrates a typical control unit 19 with a relay 22 in series with the active supply to the pump via plug 23 (see also Figure 1) and hence, power line 21.
  • relay 22 is shown in its normal operating position where power is being delivered to the pump.
  • An SCR 24 fires when there is an adverse pressure condition in the pump circuit and as a consequence, the relay is operated to open the active circuit to shut down power to the pump.
  • a reset switch 25 is used to commutate the SCR so power to the pump can be restored after a shut down.
  • two pressure sensors 26 and 27 are employed to sense pressure along sensing lines 17 and 18 as depicted in Figure 1 with the sensor 26 sensing pressure upstream of the pump and the sensor 27 sensing pressure downstream of the pump.
  • An RC circuit 28 creates a time delay of five seconds (in this case) to account for intermittent operation of the sensor 27 where say, a bubble passes through the pump.
  • the other circuit elements employed in the control unit 19 include a 555 timer 29 which delivers clock pulses to a counter 30 so that an initial time delay after initial power up is brought into play, and after the initial time delay, the counter 30 delivers an enabling pulse to a solid state switch 31 so that the solid state switch 31 can respond to an open circuit condition at the pressure sensors 26 or 27 to gate the SCR 24 and thereby shut down power to the pump.
  • the present invention can be installed into an existing pump circuit for say, a swimming pool, spa bath or other similar water circulation systems and clearly has general application in situations where it may be desirable to monitor operation of a pump circuit and shut down power to the pump. This will be dealt with further below.
  • FIG. 3 an embodiment of the present invention is illustrated which has greater flexibility in terms of application and adjustment when compared with the circuit of Figure 2.
  • the output from the circuit of Figure 3 feeds the input of the circuit of Figure 4 which operates basically the same as the timer circuit portions of Figure 2 and this aspect need not be described further.
  • the circuit of Figure 3 provides the sensor output and in this case employs dual solid state transducers, typically SENSYM SPX200DN transducers are used and these are illustrated at 31 and 32 with the transducer 31 being arranged to sense pressure variation above a reference level and transducer 32 being arranged to sense vacuum, that is pressure variation below a reference level.
  • transducer 31 would normally be located downstream while transducer 32 would normally be located upstream.
  • Each transducer has a temperature compensation circuit 33 and an output amplifier 34 which feed respective comparator circuits 35 and 36.
  • the vacuum reference level indicating an adverse condition is set at the potentiometer 37 while the comparator circuit 35 employs two branches which allow high and low pressure limits to be set for downstream sensing.
  • FIG 5 illustrates an application of the present invention to an outboard motor to bring about shut down of the water pump when a blockage occurs.
  • An SPX200DN transducer is shown at 38 and three series connected diodes at 39 are used for temperature compensation.
  • the transducer output is amplified at 40 and the output is inverted at 41 so that the switch at 42 will operate to trigger the time 43 when a blockage occurs thus lighting an LED 44 and sounding buzzer 45, the light and buzzer can be suitably positioned so that the driver of the boat initiates manual shut of the motor.
  • an automatic shut down can be employed using the timer circuit of Figure 2 or Figure 3 suitably interfaced to the circuit of Figure 5.

Abstract

A pump circuit employs a safety device (11) to shut down power to a pump (12) in the advent of adverse pressure conditions existing in the pump circuit. The pump circuit includes a pump inlet conduit (13) communicating with an inlet (14) of the pump (12), an outlet conduit (13) communicating with an outlet (16) of the pump (12), a pump inlet pressure sensing line (17) and a pump outlet pressure sensing line (18). The sensing lines (17, 18) are coupled to a power shut down control unit (19) which is connected in series with the power supply to the pump (12) through power lines (20 and 21). As long as the pressure upstream or downstream of the pump (12) remains normal, power to the pump (12) will be maintained by the control unit (19). Should the pressure sensed vary beyond predetermined limits, then power to the pump (12) would be shut down by the control unit (19).

Description

"SAFETY DEVICE"
TECHNICAL FIELD OF THE INVENTION THIS INVENTION relates to a safety device and in particular but not limited to a safety device for use in conjunction with a pump circuit such as might be used to circulate an operating fluid in a swimming pool, spa bath, air conditioner or the like.
BACKGROUND ART
Pump circuits used in swimming pools and spa baths are used to recirculate water through a filter. An inlet is employed upstream of the pump which draws water into the pump circuit. Frequently, the inlet can be blocked, say with leaves or it has happened that small children can have limbs or other body parts drawn into the inlet. Where a blockage occurs, the pump can be damaged and/or in the case of a child, the child can be injured.
OUTLINE OF THE INVENTION It is an object of the present invention to alleviate at least to some degree the aforementioned problems associated with the prior art.
In one aspect, the present invention resides in a safety device including a power shut down unit for shutting down power to a pump in a pump circuit, the shut down unit having an electrical pressure sensor for sensing variations in pressure in the pump circuit and an electrical shut down circuit for shutting down power to the pump in the advent of the sensor detecting an adverse pressure condition in the pump circuit.
In another aspect, the invention resides in a pump circuit employing a safety device to shut down power to the pump in the advent of an adverse pressure condition existing in the pump circuit, the pump having an inlet and an outlet connected in the pump circuit so operating fluid can be pumped about the pump circuit, the safety device comprising an electrical pressure sensor for sensing pressure variations in the pump circuit and an electrical power shut down circuit for shutting down power to the pump when an adverse pressure condition is sensed by the pressure sensor.
Preferably, the pressure sensor is located upstream of the pump. Advantageously, two pressure sensors are employed, one upstream and one downstream of the pump. It will also be appreciated that the sensor or other sensors can be located at other locations in the pump circuit.
A safety device preferably employs one or more time delay circuits to prevent inadvertent shut down of the power to the pump. Typically, a power-up time delay circuit is employed to account for initial pressure variations which might arise at initial power-up of the pump. Where a downstream pressure is employed, a pressure variation time delay circuit is preferably used to account for transit changes in pressure by say, an air bubble passing along the circuit.
Where the safety device is used in environments prone to temperature variation which might influence operation of the pressure sensor, it is preferable to employ a temperature compensation circuit to account for current variations brought about by changes in temperature.
The safety device is preferably configured for general purpose application inasfar as adjustability of sensed pressure bringing about shut down is concerned. To this end, the safety device typically includes high and low limit presettable circuits so that reference pressures can be preset for different applications.
BRIEF DESCRIPTION OF THE DRAWINGS Other advantages of the present invention will become apparent from a consideration of the following description of one preferred embodiment of the invention and wherein:- Figure 1 is a schematic diagram illustrating part of a pump circuit employing the teachings of the present invention; Figure 2 is a circuit diagram illustrating one preferred embodiment of a safety device according to the present invention; Figures 3 and 4 are circuit diagrams illustrating a further embodiment of a safety device according to the invention; and
Figure 5 is a circuit diagram illustrating a further application of the present invention.
METHOD OF PERFORMANCE Referring to the drawings and initially to Figure 1, there is illustrated part of a pump circuit 10 employing a safety device 11 to shut down power to a pump 12 in the advent of adverse pressure conditions existing in the pump circuit. The pump circuit includes a pump inlet conduit 13 communicating with an inlet 14 of the pump 12 and an outlet conduit 15 communicating with an outlet 16 of the pump 12. In the illustrated embodiment, two pressure sensing lines are employed, namely a pump inlet pressure sensing line 17 and a pump outlet pressure sensing line 18.
The sensing lines 17 and 18 are coupled to a power shut down control unit 19 which is connected in series with the power supply to the pump along power lines 20 and 21. Thus, in the illustrated embodiment, pressure is sensed either upstream or downstream of the pump. As long as the pressure either upstream or downstream of the pump remains normal, power to the pump will be maintained by the control unit 19. Should the pressure sensed vary beyond predetermined limits, then power to the pump would be shut down by the control unit 19.
The control 19 employs a switching circuit and a typical circuit for a control unit 19 is given in Figure 2. Figure 2 illustrates a typical control unit 19 with a relay 22 in series with the active supply to the pump via plug 23 (see also Figure 1) and hence, power line 21. In Figure 2, relay 22 is shown in its normal operating position where power is being delivered to the pump. An SCR 24 fires when there is an adverse pressure condition in the pump circuit and as a consequence, the relay is operated to open the active circuit to shut down power to the pump. A reset switch 25 is used to commutate the SCR so power to the pump can be restored after a shut down. In the illustrated embodiment, two pressure sensors 26 and 27 are employed to sense pressure along sensing lines 17 and 18 as depicted in Figure 1 with the sensor 26 sensing pressure upstream of the pump and the sensor 27 sensing pressure downstream of the pump. An RC circuit 28 creates a time delay of five seconds (in this case) to account for intermittent operation of the sensor 27 where say, a bubble passes through the pump. The other circuit elements employed in the control unit 19 include a 555 timer 29 which delivers clock pulses to a counter 30 so that an initial time delay after initial power up is brought into play, and after the initial time delay, the counter 30 delivers an enabling pulse to a solid state switch 31 so that the solid state switch 31 can respond to an open circuit condition at the pressure sensors 26 or 27 to gate the SCR 24 and thereby shut down power to the pump.
It will be appreciated that the present invention can be installed into an existing pump circuit for say, a swimming pool, spa bath or other similar water circulation systems and clearly has general application in situations where it may be desirable to monitor operation of a pump circuit and shut down power to the pump. This will be dealt with further below.
Referring to Figures 3 and 4, an embodiment of the present invention is illustrated which has greater flexibility in terms of application and adjustment when compared with the circuit of Figure 2. As can be seen, the output from the circuit of Figure 3 feeds the input of the circuit of Figure 4 which operates basically the same as the timer circuit portions of Figure 2 and this aspect need not be described further. The circuit of Figure 3 provides the sensor output and in this case employs dual solid state transducers, typically SENSYM SPX200DN transducers are used and these are illustrated at 31 and 32 with the transducer 31 being arranged to sense pressure variation above a reference level and transducer 32 being arranged to sense vacuum, that is pressure variation below a reference level. Hence, transducer 31 would normally be located downstream while transducer 32 would normally be located upstream. Each transducer has a temperature compensation circuit 33 and an output amplifier 34 which feed respective comparator circuits 35 and 36. The vacuum reference level indicating an adverse condition is set at the potentiometer 37 while the comparator circuit 35 employs two branches which allow high and low pressure limits to be set for downstream sensing.
When an adverse condition is detected, a high output is generated at the output A and the circuit of Figure 4 is activated to shut down the pump and can be suitably configured to provide an indication of an adverse condition using an alarm or lighting indicators.
Figure 5 illustrates an application of the present invention to an outboard motor to bring about shut down of the water pump when a blockage occurs. An SPX200DN transducer is shown at 38 and three series connected diodes at 39 are used for temperature compensation. The transducer output is amplified at 40 and the output is inverted at 41 so that the switch at 42 will operate to trigger the time 43 when a blockage occurs thus lighting an LED 44 and sounding buzzer 45, the light and buzzer can be suitably positioned so that the driver of the boat initiates manual shut of the motor. Alternatively, an automatic shut down can be employed using the timer circuit of Figure 2 or Figure 3 suitably interfaced to the circuit of Figure 5.
It will be appreciated that the present invention has general application in both domestic and industrial environments and accordingly, whilst the above has been given by way of illustrative example of the present invention, there are many variations and modifications which will be apparent to those skilled in the art without departing from the broad ambit and scope of the invention as set forth in the appended claims.

Claims

1. A safety device including a power shut down unit for shutting down power to a pump in a pump circuit, the shut down unit having an electrical pressure sensor for sensing variations in pressure in the pump circuit and an electrical shut down circuit for shutting down power to the pump in the advent of the sensor detecting an adverse pressure condition in the pump circuit.
2. A pump circuit employing a safety device to shut down power to the pump in the advent of an adverse pressure condition existing in the pump circuit, the pump having an inlet and an outlet connected in the pump circuit so operating fluid can be pumped about the pump circuit, the safety device comprising an electrical pressure sensor for sensing pressure variations in the pump circuit and an electrical power shut down circuit for shutting down power to the pump when an adverse pressure condition is sensed by the pressure sensor.
3. The invention according to claim 1 or claim 2 wherein the pressure sensor is located upstream of the pump.
4. The invention according to claim 1 or claim 2 wherein two pressure sensors are employed, one upstream and one downstream of the pump.
5. The invention according to claim 1 or claim 2 wherein the safety device employs one or more time delay circuits to prevent inadvertent shut down of the power to the pump.
6. The invention according to claim 5 wherein the time delay circuit includes a power-up time delay circuit employed to account for initial pressure variations which might arise at initial power-up of the pump or where a downstream pressure variation time delay circuit is employed to account for transit changes in pressure.
7. A safety device according to claim 1 further including a temperature compensation circuit to account for current variations brought about by changes in temperature.
8. A safety device according to claim 1 wherein the safety device includes high and low limit presettable circuits so that reference pressures can be preset for different applications.
PCT/AU1992/000020 1991-01-22 1992-01-22 Safety device WO1992013195A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11780/92A AU669326B2 (en) 1991-01-22 1992-01-22 Safety device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPK430891 1991-01-22
AUPK4308 1991-01-22

Publications (1)

Publication Number Publication Date
WO1992013195A1 true WO1992013195A1 (en) 1992-08-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1992/000020 WO1992013195A1 (en) 1991-01-22 1992-01-22 Safety device

Country Status (2)

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CA (1) CA2101170A1 (en)
WO (1) WO1992013195A1 (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19503403A1 (en) * 1995-02-02 1996-08-08 Ritec Srl Control device for a water supply system
FR2732713A1 (en) * 1995-04-10 1996-10-11 Cifec Protection of swimmers from suction at extraction outlet of pool
FR2732712A1 (en) * 1995-04-10 1996-10-11 Cifec Protection of swimmers from suction at extraction outlet of pool
WO1997036106A1 (en) * 1996-03-27 1997-10-02 Butterworth Jetting Systems, Inc. Programmable pump monitoring and shutdown system
WO1998036339A1 (en) * 1997-02-13 1998-08-20 Hydroservice S.R.L. A self-regulating computerized proportional control device for a water pump
EP0863278A2 (en) * 1997-03-05 1998-09-09 Plasteral, S.A. System for controlling pump operation
ES2138524A1 (en) * 1997-03-05 2000-01-01 Plasteral Sa System for monitoring the operation of pumps
ES2151375A1 (en) * 1998-02-05 2000-12-16 Plasteral Sa Fluid pump control to ensure safe operation in case e.g. for blockage of swimming pool, fountains
EP1074745A1 (en) * 1999-08-06 2001-02-07 Eng & Mark s.r.l. Hydraulic machine with automatic control device attached
EP1081312A2 (en) * 1999-09-06 2001-03-07 Nichigi Engineering Co. Ltd Safety system at a discharge port in a pool
WO2001005349A3 (en) * 1999-07-15 2002-05-02 Hydroair A Unit Of Itt Ind Inc Spa pressure sensing system capable of entrapment detection
EP1241357A1 (en) * 2001-03-12 2002-09-18 GARDENA Kress + Kastner GmbH Pump unit
WO2007147202A1 (en) * 2006-06-21 2007-12-27 Gary Hall A safety system and method for swimming pools
US20170213451A1 (en) 2016-01-22 2017-07-27 Hayward Industries, Inc. Systems and Methods for Providing Network Connectivity and Remote Monitoring, Optimization, and Control of Pool/Spa Equipment
US10030647B2 (en) 2010-02-25 2018-07-24 Hayward Industries, Inc. Universal mount for a variable speed pump drive user interface
US10718337B2 (en) 2016-09-22 2020-07-21 Hayward Industries, Inc. Self-priming dedicated water feature pump
US20200319621A1 (en) 2016-01-22 2020-10-08 Hayward Industries, Inc. Systems and Methods for Providing Network Connectivity and Remote Monitoring, Optimization, and Control of Pool/Spa Equipment
US10976713B2 (en) 2013-03-15 2021-04-13 Hayward Industries, Inc. Modular pool/spa control system
US11118437B2 (en) 2018-08-23 2021-09-14 Impact Solutions As High rate safety shutdown system with hydraulic driven fluid ends

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US3623827A (en) * 1970-03-16 1971-11-30 Robert W Mcjones Protective circuit for pressure charging of natural gas and the like
AU6447274A (en) * 1973-01-30 1975-07-17 Jacuzzi Bros. Incorporated Pump systems for liquids
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Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19503403A1 (en) * 1995-02-02 1996-08-08 Ritec Srl Control device for a water supply system
FR2732713A1 (en) * 1995-04-10 1996-10-11 Cifec Protection of swimmers from suction at extraction outlet of pool
FR2732712A1 (en) * 1995-04-10 1996-10-11 Cifec Protection of swimmers from suction at extraction outlet of pool
WO1997036106A1 (en) * 1996-03-27 1997-10-02 Butterworth Jetting Systems, Inc. Programmable pump monitoring and shutdown system
WO1998036339A1 (en) * 1997-02-13 1998-08-20 Hydroservice S.R.L. A self-regulating computerized proportional control device for a water pump
EP0863278A2 (en) * 1997-03-05 1998-09-09 Plasteral, S.A. System for controlling pump operation
EP0863278A3 (en) * 1997-03-05 1999-02-03 Plasteral, S.A. System for controlling pump operation
ES2138524A1 (en) * 1997-03-05 2000-01-01 Plasteral Sa System for monitoring the operation of pumps
ES2151375A1 (en) * 1998-02-05 2000-12-16 Plasteral Sa Fluid pump control to ensure safe operation in case e.g. for blockage of swimming pool, fountains
WO2001005349A3 (en) * 1999-07-15 2002-05-02 Hydroair A Unit Of Itt Ind Inc Spa pressure sensing system capable of entrapment detection
US6390781B1 (en) 1999-07-15 2002-05-21 Itt Manufacturing Enterprises, Inc. Spa pressure sensing system capable of entrapment detection
AU778753B2 (en) * 1999-07-15 2004-12-16 Hydroair A Unit Of Itt Industries, Inc. Spa pressure sensing system capable of entrapment detection
EP1074745A1 (en) * 1999-08-06 2001-02-07 Eng & Mark s.r.l. Hydraulic machine with automatic control device attached
EP1081312A2 (en) * 1999-09-06 2001-03-07 Nichigi Engineering Co. Ltd Safety system at a discharge port in a pool
EP1081312A3 (en) * 1999-09-06 2002-09-11 Nichigi Engineering Co. Ltd Safety system at a discharge port in a pool
EP1241357A1 (en) * 2001-03-12 2002-09-18 GARDENA Kress + Kastner GmbH Pump unit
WO2007147202A1 (en) * 2006-06-21 2007-12-27 Gary Hall A safety system and method for swimming pools
US10030647B2 (en) 2010-02-25 2018-07-24 Hayward Industries, Inc. Universal mount for a variable speed pump drive user interface
US11572877B2 (en) 2010-02-25 2023-02-07 Hayward Industries, Inc. Universal mount for a variable speed pump drive user interface
US10976713B2 (en) 2013-03-15 2021-04-13 Hayward Industries, Inc. Modular pool/spa control system
US11822300B2 (en) 2013-03-15 2023-11-21 Hayward Industries, Inc. Modular pool/spa control system
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