WO1993022714A1 - Dispositif de melange a vanne commandee electriquement - Google Patents

Dispositif de melange a vanne commandee electriquement Download PDF

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Publication number
WO1993022714A1
WO1993022714A1 PCT/AU1993/000204 AU9300204W WO9322714A1 WO 1993022714 A1 WO1993022714 A1 WO 1993022714A1 AU 9300204 W AU9300204 W AU 9300204W WO 9322714 A1 WO9322714 A1 WO 9322714A1
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WO
WIPO (PCT)
Prior art keywords
valve means
valve
water
temperature
cpu
Prior art date
Application number
PCT/AU1993/000204
Other languages
English (en)
Inventor
Scott Anthony Milan
Jeffrey James Watts
Howard Stephen Sheeran
Original Assignee
Rottwest 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 Rottwest Pty. Ltd. filed Critical Rottwest Pty. Ltd.
Priority to AU42565/93A priority Critical patent/AU665102B2/en
Publication of WO1993022714A1 publication Critical patent/WO1993022714A1/fr

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
    • G05D11/139—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring a value related to the quantity of the individual components and sensing at least one property of the mixture

Definitions

  • This invention relates to a device for mixing fluids such as water supplied to a common outlet and in particularly to a device for mixing the water supplied from separate sources of hot and cold water and for controlling pressure and/or temperature of the water in the common or mixed water outlet.
  • the mixing device according to the invention is especially suitable for use with domestic taps and it will be convenient to describe the invention with reference to that type of application. However it is to be appreciated that the mixing device can be used in other applications and can be used to mix fluids other than water.
  • Australian patent application 24440/88 discloses an electrical mixing device for showers or baths which allows a lotion or shampoo to be mixed with water. Temperature control of the mixed water is achieved by regulating hot and cold water valves which are coupled together by gearing such that when the cold-water valve is opened, the hot-water valve is closed and vice versa. Because temperature and pressure of the mixed water cannot be controlled independently a third valve is required to control the pressure of the mixed water. A mixing fitting is also required to allow the temperature of the mixed water to be monitored.
  • This mixing device is relatively complicated because it requires gearing between the hot and cold water valves, a third valve to control mixed water pressure as well as a mixing fitting for monitoring the mixed water temperature. It is an object of the present invention to at least alleviate the above mentioned disadvantages of the prior art.
  • a device for mixing water supplied to a common outlet from sources of hot and cold water including: first electrically operable valve means for controlling said supply of cold water to said common outlet; second electrically operable valve means for controlling said supply of hot water to said common outlet; and control means for controlling operation of said first and second valve means whereby temperature of water at said common outlet is continuously adjustable independent of pressure and vice versa.
  • the first and second valve means may comprise an electrically operable valve which can be adjusted between open and closed positions to control the supply of hot and cold water to the common outlet.
  • the valve means comprises an electric motor coupled to a valve.
  • the valve means may comprise a proportional opening solenoid valve.
  • Preferred • valves are those which are opened or closed by rotation of an adjustment member such as a spindle or stem.
  • Preferred valves include stainless steel ball valves and needle and seat valves. 1/4 turn ball valves modified as described hereinafter are most preferred.
  • Spindle valves may also be used although they are generally multiturn and require regular maintenance with the replacement of washers. Ceramic disc valves, especially 1/4 turn ceramic disc valves may be used.
  • Electric motors coupled to valves have been used in industry for process control applications however these motors are large and expensive, the cost being proportional to the size of the job to be done.
  • motorized valves need to be small, simple and inexpensive.
  • a small reversible DC motor powered by a battery or AC mains (with appropriate transformer, rectifier regulator etc) coupled to the spindle of a ball valve is particularly suitable.
  • Stepper motors may be used, as well as non-reversible AC or DC motors provided appropriate valves, gearing, couplings, control means etc. are selected.
  • a small DC motor generally exhibits a small torque at high r.p.m.
  • the spindle of ball valve however requires a relatively high torque at very low turning speeds, preferably in the order of about 2 to 5 rpm, more preferably about 3 rpm.
  • the motor can be coupled to the valve spindle via a high reduction gear box.
  • the reduction gearbox provides a torque multiplication factor, which allows a relatively small electric motor to provide sufficient torque to turn the spindle of the valve.
  • An advantage of using a small motor with low power consumption is that the motorized valve can be powered by a small battery such as a rechargable sealed lead acid battery supported by a small solar cell. Accordingly the device according to the invention can be given complete independence from the 240V AC mains if desired. This reduces the installation cost and is an extra safety feature of the invention. The battery also guarantees supply during a power failure.
  • a small battery such as a rechargable sealed lead acid battery supported by a small solar cell.
  • a needle and seat valve instead of a ball valve. These are usually high precision valves and consequently are expensive.
  • a more preferred method is to modify the shape of the orifice eg. by providing a ball with a slit-shaped orifice rather than a circular orifice. It has been found that a ball with a slit-shaped orifice has a reduced flow rate and more linear flow characteristics than a ball having a circular orifice of the same size.
  • hot and cold water are supplied to the device at the same or similar pressures. This is generally the case when both hot and cold water are supplied at mains pressure. If necessary a pressure reducing valve may be located in the cold water supply to reduce the cold water pressure.
  • ball valves generally have a two piece ball and stem arrangement- Lag between movement of the stem and ball can result in undesirable backlash which makes consistent temperature and pressure adjustment difficult.
  • a modification which eliminates backlash is to use a single piece ball and stem.
  • Small backlash parameters are also desirable for the coupling, gearbox and motor.
  • Another important feature of the ball valve is the number of degrees of turn required to move the ball valve from fully open to the fully closed position. This parameter is determined by the relationship between the diameter of the ball and the width of the orifice as illustrated in the following table:
  • the longer response time of 4.2 seconds results in a smoother temperature adjustment and better flow rate control.
  • the response time is also dependent on the relationship between the speed of the motor and the ratio of the gearbox since this governs the speed of rotation of the shaft or stem.
  • the device includes limit switches to terminate current supply to the motor when the valve is in a fully opened or fully closed position. It is relatively easy to adapt limit switches to a 1/4 turn ball valve. However it is more difficult to mount limit switches on a multiturn valve such as a needle and seat valve because it is difficult to physically position limit switches so that they are only actuated when the valve is fully opened or fully closed. One way to overcome this problem is through the use of a worm gear on the shaft of the multiturn valve, although other methods would be evident to a person skilled in the art. For valves having spindles which are not free to rotate a full 360°, the limit switches also can act to prevent damage to the motors and gearboxes by terminating current supply to the motor before the spindle reaches the limit of its travel.
  • the control means may take a number of forms depending on the type of electrically operable valve means used and the type of functions required.
  • the control means may be realised via digital control circuits such as a suitably programmed microprocessor or microcomputer.
  • the control means may be realised with relays and/or essentially analogue circuits utilizing integrated and/or discrete components.
  • the control means will be described with reference to the control of a pair of electrically operable valve means, such as a D.C. motor coupled to a valve.
  • the control means may include one or more control buttons or switches to allow an operator to perform the following operations:
  • these operations or combinations thereof may be performed using four buttons or switches labelled “ON”, “OFF”, “HOT” and “COLD” .
  • operation of the ON button or switch may supply current having the first polarity to the first and second valve means causing the first and second valve means to open, release of the button or switch stopping the current supply.
  • Operation of the OFF button may supply current having the second polarity to the first and second valve means causing the first and second valve means to close, release of the OFF button stopping the current flow.
  • Operation of the COLD button may supply current having the first polarity to the first valve means causing the first valve means to open and/or may supply current having the second polarity to the second valve means causing the second valve means to close, release of the button stopping the current supply.
  • a COLD button performing both operations is particularly advantageous when hot and cold water is supplied to the device at the same pressure ie. mains pressure, and the first and second valve means have linear flow characteristics. This is because operation of the COLD button will alter the temperature without altering the pressure.
  • Operation of the HOT button may supply current having the first polarity to the second valve means causing the second valve means to close and/or may supply current having the second polarity to the first valve means causing the first valve means to close, release of the button stopping the current supply.
  • the control means may also include a "one touch OFF" button which allows the operator to close both valves in a single "one touch" operation.
  • the mixing device preferably includes means for terminating current supply to the valve means when the valve means is in a fully opened or fully closed position. This may be achieved by the use of microswitches which are activated by an arm protruding from the valve/gearbox coupling when the valve means is in a fully opened or fully closed position. Other means such as optical sensors may also be used.
  • the control means including the buttons or switches may be located in a single housing which may be mounted on a wall or bench or other convenient location.
  • the electrical components including any transformers, rectifiers etc. are mounted separately from the control buttons or switches.
  • the electrical components may be mounted out of sight in the wall or under a bench.
  • the buttons or switches may be located on a separate remote control pad _which is electrically or functionally connected to the remainder of the electrical components. The remote control pad may then be located safely in a wet area such as in a shower recess, beside a bath or wash basin, etc.
  • control means includes means for sensing temperature and/or pressure in the mixed water outlet.
  • the temperature and/or pressure sensors may be provided as part of a servo motor control system for automatically setting temperature and/or pressure .
  • Each motor controlled valve may include an encoder for supplying feedback data concerning the position of the motor controlled valve to the servo motor control system.
  • Desired temperature and/or pressure settings may be inputted to the servo motor system via temperature/pressure preset buttons, switches or the like. The latter may be provided on the remote control pad. Display means for displaying actual temperature and/or pressure may also be provided on the control means or remote control pad or other convenient location. The control means or remote control pad may also include a "ready" light which indicates when the preset temperature and/or pressure is attained. Panel interface of the control units with other electrical fittings such as exhaust fans, lights, radio, intercom, etc. is also envisaged.
  • control means includes a central processing unit (C.P.U.) which accepts commands from a control panel, for adjusting the valve means accordingly.
  • C.P.U. central processing unit
  • the CPU can recreate that pressure/temperature condition on command. This can be done by monitoring the actual temperature and pressure at the mixed water outlet via pressure and temperature sensors. Desired pressure and temperature conditions may be memorized by pressing a "memory store" button on the control panel. On recall the CPU will adjust the values until the memorized conditions are recreated.
  • the device includes three temperature sensors, one on the cold water inlet, one on the hot water inlet and one on the mixed water outlet.
  • the CPU can monitor, via the temperature sensors, any change in temperature at the cold and hot water inlets, and compensate for that change in temperature by making appropriate changes to the valve positions, thereby maintaining the desired mixed water temperature.
  • a flow rate sensor can also be placed at the mixed water outlet if desired.
  • stepper motors have a number of advantages. Firstly because each pulse corresponds to one specific step angle (eg. 1.8°) there is a higher degree of accuracy of movement and so the processor knows exactly where each motor is. Secondly there is no need for limit switches to indicate the fully open and fully closed positions of the valve. This is because the processor knows how many steps in either direction it takes for the valve to be fully open or fully closed. When the motor has been driven the required number of steps the CPU will stop the motor. This feature is specifically suitable for multiturn valves.
  • the CPU has the ability to store and recall a number of different temperature/pressure conditions. This would allow for example a house installation of four or five sets of motorized valves to be controlled by one central controller and power supply, thus reducing the system cost.
  • Another advantage of using a CPU to control the position of the valves is that any non-linearity in the flow characteristics of the valve means can be compensated for. Also it is possible to include an "antiscold" safety feature into the device. This may be done by allowing an operator to input a maximum allowable temperature via a "maximum temperature” button on the control panel. Once set the CPU may not allow the temperature at the mixed outlet to go beyond the specified temperature. This feature is particularly useful in situations accommodating young children, the elderly and the disabled.
  • the device may be controlled by a remote control panel or pad which can be located out of reach of small children.
  • the control panels and buttons can be enlarged to any desired size and placed in any convenient position, depending on the specific needs of the users.
  • one set of electrically controlled taps can replace two sets . of conventional taps. This can be achieved by using the one set of valves to mix the water and then direct it to the shower or bath outlet, ie. by means of a solenoid valve. This valve could be controlled by the central control unit.
  • the valves are fitted with 1/2" B.S.P. compression fittings to facilitate easy installation into 1/2" copper pipe normally installed in domestic and commercial buildings.
  • Typical mains pressures in domestic and commercial buildings range from approximately 50 psi to 120 psi. In extreme cases of high mains pressure there would be some advantage in installing pressure regulating valves on the water inlet lines. This would assist smooth operation of the mixing device.
  • Figure 1 is a graphical comparison of valve positions versus flow characteristics for a number of ball valves
  • Figure 2 is a representation of a modified ball valve
  • Figure 3 is a partial-sectional view of a motor and gearbox coupled to a ball valve
  • Figure 4 is a sectional view taken through line 4-4 of figure 3;
  • Figure 5 is a plan view of pair of motorized valves coupled together via a mixing chamber
  • Figure 6 is a circuit diagram of one embodiment of the invention.
  • FIG. 7 is a block diagram of an embodiment of the invention incorporating a central processing unit
  • Figure 8 is a representation of a control panel for a device including a central processing unit.
  • the flow characteristics plotted in figure 1 were obtained for ball valves having different orifice sizes using a mains pressure of 65 psi. The results show that the flow characteristics become more linear as orifice size decreases. The results also show that a slit-shaped orifice reduces the flow rate and gives more linear flow characteristics when compared to a circular orifice of the same cross-sectional area.
  • Figure 2 shows a motor 1 coupled to a gearbox 2.
  • Gearbox 2 is coupled to a ball valve 3.
  • Motor 1 is a high quality, low inertia precision DC reversible motor which has a very low power requirement.
  • Gearbox 2 is a high reduction gearbox with the primary function of reducing rotation of gearbox output shaft 4 to about 3 rpm.
  • the coupling between the gearbox output shaft 4 and stem 5 of ball valve 3 is such that there is low backlash.
  • output shaft 4 of gearbox 2 comprises a female hexagonal recess 6.
  • a male hexagonal mold 7 is provided on the end of the valve stem. The mold 7 fits tightly into recess 6 forming a rigid coupling.
  • the ball valve 3 comprises a single piece ball stem assembly 5a.
  • Inlet 8 of ball valve 3 is provided with a 1/2 inch BSP compression fitting 9 to facilitate connection to 1/2 inch copper pipe normally installed in domestic and commercial buildings.
  • Gearbox output shaft 4 is provided with an optical disk 10 having an extended segment 10a which together with optical sensors 11 and 12 mounted on the inner wall of the upper body of ball valve 3, acts to switch off power to motor 1 when ball valve 3 is fully opened or fully closed.
  • Optical disc 10 and sensors 11, 12 are shown more clearly in figure 4.
  • Figure 5 shows two such motor/gearbox/valve assemblies coupled together via a coupling 13 including a mixing chamber 15 and a mixed water outlet 15a.
  • FIG. 6 shows a schematic diagram of a valve mixing device according to one embodiment of the present invention.
  • the latter embodiment utilizes control means realized with relays.
  • the control means includes four control touch sensitive membrane switches/buttons labelled ON, HOT, OFF and COLD respectively, steering diodes 14, 14a and 14b, relays 17, 18 and 19, limit switches 20, 21, 22 and 23 and DC motors 24 and 25.
  • Motors 24, 25 are arranged to drive HOT and COLD water valves 27, 28 respectively.
  • Power to the mixing device is supplied through a l.OAh sealed lead acid battery 26 which may be recharged using a small 1 watt solar panel (not shown) .
  • Steering diodes 14, 14a, 14b and relays 17-19 are arranged such that depression of the various switches/buttons causes relays 17-19 and motors 24, 25 to be actuated as follows:
  • depression of the ON button supplies current having a first polarity to both DC motors 24, 25 causing associated valves 27, 28 to open. Release of the ON button stops the current supply. Depression of the OFF button supplies current having a second polarity, opposite to the first polarity, to both motors 24, 25 causing associated valves 27, 28 to close. Release of the OFF button stops the current flow.
  • Depression of the HOT button supplies current of the first polarity to motor 24 causing hot water valve 27 to open and supplies current of the second polarity to motor 25 causing cold water valve 28 to close.
  • depression, of the HOT button increases the temperature of the water in the mixed water outlet. If water is supplied to hot and cold valves 27, 28 at the same pressure and if valves 27, 28 have substantially linear flow characteristics, depression of the HOT button will not substantially alter pressure of water in the mixed water outlet. Release of the HOT button stops the current flow.
  • Depression of the COLD button supplies current of the first polarity to motor 25 causing to the cold water valve 28 to open and current of the second polarity to motor 24 causing the HOT water valve 27 to close. Accordingly depression of the COLD button decreases the temperature of the water. Release of the COLD button stops the current flow.
  • Limit switches 20 and 22 stop current supply to motors 24, 25 when the associated valves are fully opened while limit switches 21 and 23 stop current supply to motors 24, 25 when the associated valves are fully closed.
  • FIG. 7 is a block diagram of a mixing device controlled by a central processing unit (CPU) 29 such as a microprocessor or microcontroller. Power is supplied to the device by l.OAh sealed lead acid battery 30, charged by a 1 watt solar panel 31.
  • CPU 29 accepts input commands via keyboard 32. Keyboard 32 allows an operator to store and recall up to eight sets of temperature/pressure combinations. The desired - pressure/temperature combinations are stored in memory 33.
  • the keyboard includes HOT, COLD, ON and OFF buttons and allows the operator to control the temperature and pressure of the water manually using the HOT, COLD, ON and OFF buttons. The latter buttons may perform the same or similar functions as the buttons described with reference to figure 6 and to set the maximum temperature of the water at the mixed water outlet.
  • Temperature sensors 34, 35 and 36 monitor the temperatures in the hot water inlet, cold water inlet and mixed water outlet respectively and feed that information back to CPU 29.
  • Pressure sensor 37 located in the mixed water outlet monitors the pressure of the water in the mixed water outlet and feeds that information back to the CPU 29.
  • a desired temperature/pressure condition CPU 29 can recreate that temperature/pressure condition on command. It does this by monitoring the actual temperature and pressure at the mixed water outlet, comparing the actual temperature and pressure with the desired temperature and pressure and adjusting the hot and cold water valves (not shown) via motors 38 and 39 respectively until the desired temperature and pressure conditions are recreated.
  • the CPU controls the operation of motors 38, 39 via interfaces 40 and 41 and motor drivers 43 and 43a.
  • Each motor driver 43, 43a may comprise a field effect power transistor.
  • CPU 29 can monitor, via temperature sensors 34 and 35, any change in temperature of the water at the cold and hot water inlets respectively, and compensate for that change in temperature by making appropriate changes to the valve positions thereby maintaining the desired mixed water temperature. This allows the device to anticipate changes to water temperature before they reach the mixed water outlet and to adjust the valve positions with a more rapid response.
  • CPU 29 is coupled to an LCD display 42 upon which temperatures, pressures, maximum temperature, memory number etc can be displayed.
  • CPU 29 is also coupled to a real time clock 43 which is used to run periodical system checks. It is also possible to use the real time clock to display the time on the LCD display 42.
  • CPU 29 is coupled to a serial port interface 44 alowing interconnection to other motorized valve sets and a reset interface 45 allowing a technician to reset CPU 29 via a reset button associated with reset interface 45.
  • Figure 8 shows a possible design for a control panel for the mixing device shown in figure 7. Buttons 46, 47,
  • the control panel includes a liquid crystal display 50, memory recall button 51, memory store button 52, maximum temperature set-up button 53 and maximum temperature set-down button 54.
  • the mixing device of the present invention may be fitted as a replacement for manually operated taps.
  • the applications potentially include kitchen sinks, laundry troughs, showers, baths, washing machines and hand basins. They may be installed as original and permanent equipment in houses, shops, hospitals, nursing homes, homes for the disabled, etc.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Multiple-Way Valves (AREA)

Abstract

L'invention décrit un dispositif conçu pour mélanger l'eau fournie à une sortie commune par des sources d'eau froide et d'eau chaude. Le dispositif comprend: un premier dispositif de vanne man÷uvrable électriquement et conçu pour commander la fourniture d'eau froide à la sortie commune; un second dispositif de vanne man÷uvrable électriquement et conçu pour commander la fourniture d'eau chaude à la sortie commune; et un dispositif de commande pour commander le fonctionnement du premier et du second dispositif de vanne, grâce auquel la température de l'eau, à la sortie commune, est réglable de manière continue, indépendamment de la pression, et vice versa.
PCT/AU1993/000204 1992-05-07 1993-05-07 Dispositif de melange a vanne commandee electriquement WO1993022714A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42565/93A AU665102B2 (en) 1992-05-07 1993-05-07 Electrically controlled valve mixing device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPL2284 1992-05-07
AUPL228492 1992-05-07

Publications (1)

Publication Number Publication Date
WO1993022714A1 true WO1993022714A1 (fr) 1993-11-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1993/000204 WO1993022714A1 (fr) 1992-05-07 1993-05-07 Dispositif de melange a vanne commandee electriquement

Country Status (1)

Country Link
WO (1) WO1993022714A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20130114A1 (it) * 2013-04-26 2014-10-27 Domo Hydros S R L Dispositivo modulare e componibile di miscelazione di liquidi con controllo elettronico della temperatura e della portata del flusso in uscita.
US20180347720A1 (en) * 2017-06-04 2018-12-06 Michael Antonio Mariano Stepper Valve with Stepper Valve Motor Controller
CN109458481A (zh) * 2018-12-28 2019-03-12 湖南福力环保科技有限公司 耐高压电动阀及并联多路电动阀
EP4134777A1 (fr) * 2021-08-09 2023-02-15 B/E Aerospace, Inc. Robinet mélangeur thermostatique avec électrovannes proportionnelles doubles

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1197593A (fr) * 1984-05-17 1985-12-03 Mark Reed Methode et dispositif de controle et de regulation continus de la temperature d'un fluide debite
US4674678A (en) * 1985-09-02 1987-06-23 Knebel & Rottger Gmbh & Co. Mixing fixture for plumbing
US4965894A (en) * 1987-10-28 1990-10-30 Altura Leiden Holding B.V. Mixing device
US4978058A (en) * 1988-02-09 1990-12-18 Fisher & Paykel Limited Flow control systems and/or laundry machines including such flow control systems
AU1020992A (en) * 1991-01-31 1992-08-06 Sloan Valve Company Mixing faucet having remote temperature control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1197593A (fr) * 1984-05-17 1985-12-03 Mark Reed Methode et dispositif de controle et de regulation continus de la temperature d'un fluide debite
US4674678A (en) * 1985-09-02 1987-06-23 Knebel & Rottger Gmbh & Co. Mixing fixture for plumbing
US4965894A (en) * 1987-10-28 1990-10-30 Altura Leiden Holding B.V. Mixing device
US4978058A (en) * 1988-02-09 1990-12-18 Fisher & Paykel Limited Flow control systems and/or laundry machines including such flow control systems
AU1020992A (en) * 1991-01-31 1992-08-06 Sloan Valve Company Mixing faucet having remote temperature control

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20130114A1 (it) * 2013-04-26 2014-10-27 Domo Hydros S R L Dispositivo modulare e componibile di miscelazione di liquidi con controllo elettronico della temperatura e della portata del flusso in uscita.
WO2014173524A2 (fr) * 2013-04-26 2014-10-30 Domo Hydros S.R.L. Dispositif modulaire et composable pour mélanger des liquides, avec commande électronique de la température et du débit de l'écoulement de sortie
WO2014173524A3 (fr) * 2013-04-26 2014-12-18 Domo Hydros S.R.L. Dispositif modulaire et composable pour mélanger des liquides, avec commande électronique de la température et du débit de l'écoulement de sortie
CN105308527A (zh) * 2013-04-26 2016-02-03 多蒙流体有限公司 具有温度和出口流速电子控制的用于混合流体的模块化及可组合的装置
US9657853B2 (en) 2013-04-26 2017-05-23 Domo Hydros S.R.L. Modular and composable device for mixing liquids with electronic control of the temperature and of the flowrate of the outlet flow
US20180347720A1 (en) * 2017-06-04 2018-12-06 Michael Antonio Mariano Stepper Valve with Stepper Valve Motor Controller
US10948100B2 (en) * 2017-06-04 2021-03-16 Michael Antonio Mariano Stepper valve with stepper valve motor controller
CN109458481A (zh) * 2018-12-28 2019-03-12 湖南福力环保科技有限公司 耐高压电动阀及并联多路电动阀
EP4134777A1 (fr) * 2021-08-09 2023-02-15 B/E Aerospace, Inc. Robinet mélangeur thermostatique avec électrovannes proportionnelles doubles

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