WO2017182332A1 - Système et procédé de mise en service d'une unité de réglage - Google Patents

Système et procédé de mise en service d'une unité de réglage Download PDF

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Publication number
WO2017182332A1
WO2017182332A1 PCT/EP2017/058682 EP2017058682W WO2017182332A1 WO 2017182332 A1 WO2017182332 A1 WO 2017182332A1 EP 2017058682 W EP2017058682 W EP 2017058682W WO 2017182332 A1 WO2017182332 A1 WO 2017182332A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
information
valve assembly
characteristic information
marking
Prior art date
Application number
PCT/EP2017/058682
Other languages
German (de)
English (en)
Inventor
Holger Steltner
Manuel Braun
Jan Reich
Matthias Von Zeppelin
Thomas Ruschival
Original Assignee
Festo Ag & Co. Kg
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 Festo Ag & Co. Kg filed Critical Festo Ag & Co. Kg
Publication of WO2017182332A1 publication Critical patent/WO2017182332A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0041—Electrical or magnetic means for measuring valve parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters

Definitions

  • the invention relates to a system comprising a
  • Process valve assembly with a process fitting and designed for operating the process fitting actuator, and an actuator for controlling and / or monitoring the process valve assembly.
  • the invention further relates to a method for
  • Commissioning an actuating unit which is designed to control and / or monitor a process valve assembly with a process fitting and an actuator designed for actuating the process fitting.
  • a system of the type mentioned in the beginning is typically used in process industry or process automation and serves to regulate a process fluid flow.
  • the process fitting has a position in it
  • variable valve member which is disposed in the process fluid flow and by its position determines the flow rate of the process fluid or influenced.
  • the valve member may typically in a blocking position or in a
  • Open position can be offset to lock or release the process fluid flow either.
  • blocking position and the open position so For example, to regulate the flow rate of the process fluid to a desired value.
  • the process fitting is actuated by means of an actuator.
  • the actuator provides, for example, a torque or a force available with or with the
  • Valve member is acted upon, so that it assumes the desired position.
  • the actuator is usually designed as a pneumatic drive.
  • the actuation of the actuator is done by a
  • the actuator is typically connected via a field bus with a higher-level control and receives from this control signals, such as a
  • the actuator performs the actuation of the actuator.
  • the adjusting unit is preferably designed as a positioner or positioner or as a valve control head.
  • the actuator can in particular for controlling a
  • pneumatic actuator have pneumatic valves or contain.
  • the setting unit is also designed to monitor the process valve assembly, in particular the actuator and / or the valve fitting.
  • the actuator via a provided in the system
  • State of the process valve assembly can be closed.
  • the detected state can be used to control the
  • actuator and / or for diagnostic purposes, eg to determine that maintenance is required.
  • the monitoring of the process valve assembly may also be based on that performed by the actuator
  • Control done For example, the number of
  • Position changes or switching cycles of the valve member are counted, which are to be effected with the actuation of the actuator by the actuator. If this number exceeds a predetermined threshold, it can be concluded that there is a need for maintenance.
  • the characteristic information includes, for example, characteristics of the actuator, such as piston area, stroke,
  • Friction coefficients and / or spring constants and / or characteristics of the process fitting such as pipe diameter and / or friction coefficients.
  • Such characteristic information can be used, for example, to improve the control characteristics and the possibilities for detection and differentiation of malfunctions (for example due to wear of components).
  • Actuator and process fitting are normally purely mechanical components without integrated electronics and thus also without electrical interface, so that communication with the
  • Actuator for communicating the characteristic information is not possible.
  • Process valve assembly are adapted.
  • DE 10 2004 005 401 A1 relates to the technical field of mobile working machines, in particular mobile hydraulics, and describes a method for setting a control flow of current-controlled hydraulic valves for actuation
  • Control current correction value is attached to a housing as a code.
  • An object of the invention is to improve in the system mentioned above in an efficient manner, the interaction between the actuator and the process valve assembly.
  • the process valve assembly at least an optically readable marker with marker information contained therein, and the system further comprises an optical reading device, which is formed
  • Process valve assembly to provide descriptive characteristic information based on the marking information, and the actuator is configured to perform the control / and / or monitoring of the process valve assembly using the characteristic information.
  • Characteristic information is provided, which is then used by the control unit for controlling and / or monitoring exactly this process valve assembly.
  • the optically readable marker is attached directly to the process valve assembly.
  • the device of the control unit with the characteristic information is connected only with little additional effort.
  • the optical readout of the marker with the reading device can be in a simple manner, for example during assembly take place if the process valve assembly is easily accessible. Once the reader and / or the
  • Actuator is the read marking information, this can be the characteristic information independently,
  • this transmission option can be omitted.
  • the marking does not have to be directly at the
  • Process valve assembly may be appropriate, but may
  • the mark also from the
  • Process valve assembly for example, from the color and / or dimensions exist.
  • the method comprises the steps of: detecting marking information contained in an optically readable marking on the process valve assembly by optically reading the marking;
  • Marking information and setting up the actuator so that it controls and / or monitors the process valve assembly using the characteristic information.
  • the setting unit is preferably designed to adapt a control and / or regulator model for controlling the process valve assembly based on the characteristic information.
  • the setting unit is designed based on the characteristic information an observer model for
  • regulator and / or observer models are known with which a control or monitoring of an actuator or a process fitting can be done.
  • the models are mathematical functions that describe the dynamic behavior of the actuator and / or process fitting.
  • Characteristic information is used, which describes exactly that process valve assembly, which is controlled or monitored on the basis of the models, can be an optimal
  • Control or monitoring can be achieved.
  • the setting unit is designed to determine the receipt of the characteristic information and after receipt of the
  • Characteristic information to perform an adaptation of a control, regulator and / or observer model
  • the reading device is a mobile device.
  • the setting unit and the reading device expediently have respective ones Communication interfaces.
  • the reading device is
  • the reading device is designed for example as a mobile phone with integrated camera.
  • the optically readable medium is designed for example as a mobile phone with integrated camera.
  • Marking can then be photographed for example by means of the camera and be evaluated by a software, such as an app, the mobile phone to the
  • Characteristic information for example, be retrieved from a local or external database.
  • the characteristic information can then be provided to the actuator. Due to the widespread use of mobile phones with integrated
  • Cameras can be assumed that a corresponding mobile phone is available during assembly, so that it is not necessary to provide a dedicated reading device. Instead, only an appropriate app must be offered.
  • NFC interfaces are NFC interfaces.
  • the actuating unit is preferably designed to exist in a de-energized state, preferably in a state
  • connection to a control level to receive the marking information and / or the characteristic information when using the aforementioned NFC interfaces, it is possible that the actuator receives the marker information and / or the characteristic information (and also stores) without the actuator is connected to a power source.
  • NFC it is namely possible to describe a memory chip (which in this case is provided on the setting unit) without this being supplied with power (by the setting unit).
  • the actuator is particularly well accessible before connection to stationary networks, such as the power grid, therefore, it is advantageous to form the actuator so that the characteristic information in a de-energized state of
  • Actuating unit can be provided.
  • the reading device can also be integrated in the setting unit.
  • the reading device can be permanently installed in the setting unit - for example, the setting unit may have an integrated digital camera and corresponding software for evaluating recorded digital images. Furthermore, the reading device can also be designed as a module of the setting unit, so that it can be used, for example, by the
  • Reading device or the setting unit be designed to be used for the establishment of other actuators by, for example, a corresponding
  • Actuator and / or the reading device a determined Marking information and / or characteristic information can transmit to another control unit.
  • the setting unit and / or the reading device is designed to retrieve the characteristic information based on the marking information from a database.
  • the database can be on the actuator, the
  • the marking information may contain the parameter information.
  • the parameter information comprises
  • the process fitting and the actuator each have their own, optically readable mark.
  • Reading device is designed to capture from each mark its own marking information and based on each marking information to determine a corresponding characteristic information.
  • the control and / or monitoring by the control unit can be based on several characteristic information.
  • each parameter information describes that component to which the associated marking is attached.
  • Figure 1 is a block diagram of a system with a
  • FIG. 2 shows a flowchart of a method for
  • the system 1 shows a block diagram of an exemplary embodiment of a system 1.
  • the system 1 comprises an actuator 2, a process valve assembly 3 and an optical device exemplified as a mobile device
  • Process valve assembly 3 are exemplary of a
  • the process valve assembly 3 has an actuator 5 and a process fitting 6.
  • the actuator 5 is used
  • the system 1 shown in FIG. 1 serves for passing through the process fitting 6, not shown in FIG. 1
  • the actuator 2 is formed, the
  • Control valve unit 3 to control and / or monitor.
  • the control of the process valve assembly 3 is carried out in particular according to one of a higher-level control 12 received control signal.
  • the higher-level controller 12 is, for example, a programmable logic controller (PLC).
  • the process valve assembly 3 has at least one optically readable marking 15, 16.
  • two markings 15, 16 are present by way of example.
  • a first optically readable marking 15 is provided on the actuator 5 and a second optically readable marking 16 is provided on the process fitting 6. It can
  • Markings 15, 16 each contain a marking information.
  • the optical reading device 4 is designed to detect at least one marking information by optically reading one of the markings 15, 16.
  • the optical reading device 4 is formed for each of
  • Markers 15, 16 to detect a respective marking information.
  • the actuator 2 and / or the optical reading device 4 are formed, a process valve assembly 3
  • a respective parameter information can be provided based on each of the marking information.
  • Communication interfaces 17 and 14 transmits to the actuator 2.
  • the actuating unit 2 is designed to perform the control and / or monitoring of the process valve assembly 3 using the characteristic information.
  • the characteristic information is thus made available to the actuator in an efficient manner or made available for the actuator 2, whereby the control and / or
  • Actuating unit 2 can already be put into position during assembly, later in operation, the control and / or
  • the actuator 2 is preferably designed as a positioner or valve control head
  • the actuator 2 preferably has a
  • connection interface 11 is, for example, a digital one
  • the setting unit 2 receives from the higher-level controller 12 a control signal and performs according to this control signal a control of
  • the setting unit 2 furthermore has a communication interface 14 which serves for communication with the optical reading device 4.
  • Communication interface 14 is preferably as
  • Nahfeldkommunikations reinforcestelle in particular as NFC interface formed.
  • control unit 2 has an electronic control unit (not shown in FIG. 1), in particular via at least one microcontroller, which has appropriate software in order to control the control unit 2
  • the reading device 4 is preferably as a mobile device
  • Reading device 4 has a reading unit 18,
  • an integrated digital camera based on the markers 15 and 16 optically read or
  • the reading device 4 is formed from the read or photographed mark 15, 16 the
  • Tag information preferably an identifier, such as a product key to determine. This can in particular locally on the reading device 4 by appropriate software.
  • the reading device 4 is further configured to access a database and retrieve a characteristic information from the database using the marking information, in particular of the identifier. For example, in the database
  • the database can be stored locally on the reading device 4 or on an external server. In the latter case, the
  • Reading device 4 to be formed a
  • Reading device 4 is in particular designed based on several marking information more
  • the reading device 4 may be formed, the
  • the reading device 4 also has a
  • the communication interface 17 which is used for communication with the actuator 2.
  • the communication interface 17 is preferably as a near-field communication interface,
  • the reading device 4 is formed, the
  • Marking information and / or the characteristic information via the communication interface 17 to the actuator 2 to transmit.
  • This can be for example in compressed and / or condensed form - ie, the reading device 4 can be designed to be in front of the
  • the reading device is integrated in the actuator.
  • the actuator In this case, the
  • the reading device is designed as a module of the setting unit and / or removable from the setting unit, so that they are exchanged and / or for other actuators when commissioning this
  • Actuators can be used.
  • the process valve assembly 3 has the actuator 5, the process fitting 6 and a mounting bridge 7.
  • Actuator 5 is on the mounting bridge 7 at the
  • Process valve assembly 3 also via other components, such as a not shown in the figure 1
  • the process fitting 6 is flowed through during operation of a process fluid and has a valve member 8, via whose Position of the process fluid flow can be regulated.
  • the valve member 8 is mounted rotatably in the process fitting 6.
  • Rotary position of the valve member 8 can be done a regulation of the process fluid flow.
  • the valve member 8 is exemplified in FIG. 1 as a throttle valve.
  • Valve member 8 of course, be executed in a different construction.
  • the actuator 5 is used to actuate the process fitting 6.
  • the actuator 5 is, for example, a pneumatic rotary drive, which comprises one or more pressure chambers not shown in the figure and a piston, not shown in the figure. By pressurizing at least one of the pressure chambers, the piston is set in motion. The piston movement is used to a
  • valve member 8 via a
  • Output shaft 9 is mechanically coupled to the actuator 5.
  • the control of the actuator 5 is performed by the
  • Actuator 2 In the illustrated case of a pneumatic
  • the actuator 2 comprises a pneumatic control unit, not shown in the figure, for example, an I / P converter - that is, a converter which converts an electrical signal into a pneumatic signal - and / or a solenoid valve, via which a pneumatic connection between at least one of the pressure chambers and a pressure source, not shown in the figure 1 can be produced.
  • a pneumatic control unit for example, an I / P converter - that is, a converter which converts an electrical signal into a pneumatic signal - and / or a solenoid valve, via which a pneumatic connection between at least one of the pressure chambers and a pressure source, not shown in the figure 1 can be produced.
  • Actuator 2 and the actuator 5 can also share
  • Process valve assembly 3 in particular to provide the actuator 5, with electrical drive means or actuators instead of the fluidic drive devices discussed above.
  • the valve member 8 of the process fitting 6 can in this case by an electric drive of the
  • Actuator 5 can be actuated.
  • the actuator 5 when the actuator 5 are formed as a pneumatic or hydraulic component and the process fitting 6 as a purely mechanical component, they have no electrical or electronic circuitry, in particular no electrical or electronic
  • the actuator 5 and the process fitting 6 are purely mechanical field devices. It should be noted in this context that the actuator 5 may be formed as an electric actuator.
  • the optically readable mark provided on the process valve assembly 3 is preferably a graphic pattern in which the mark information codes is.
  • the mark information codes is a QR code and / or a bar code.
  • at least parts of the marking information as a string, in particular as a letter sequence, in the
  • the first marking 15 provided on the actuator 5 and / or the second marking 16 provided on the process fitting 6 can be shown in each case in one of the FIGS
  • the marking is provided, for example, as a laser inscription on a housing of the process valve assembly, in particular on a housing of the actuator and / or the process fitting.
  • the mark can also be used as a label,
  • Marking is preferably a "Direct Part Marking.”
  • the marking is especially designed to be rough
  • marking information may be in the mark
  • Identifier such as a product key may be contained, which clearly identifies the respective system component - ie the actuator or the process fitting to which the mark is attached.
  • the identifier can take the model or the type of the respective system component and / or the respective system component for itself
  • the mark may be as
  • Marking information also already from the actuator 2 contain characteristic information to be used.
  • Marking may comprise all or some of the characteristic information to be used by the actuator 2 as mark information.
  • Reading device 4 and / or the actuator 2 can be realized more easily, since this then only provided to provide the characteristic information on the read
  • the parameter information preferably comprises a
  • Friction coefficient a spring constant
  • Information about the stroke preferably refers to a stroke of the piston, for example the maximum stroke.
  • Information about the friction coefficient preferably refers to a friction coefficient of Actuator 5, in particular a coefficient of friction between the piston and a cylinder in which the piston is guided.
  • the information about the friction coefficient may also relate to the process fitting 6,
  • Valve member a coupled to the valve member shaft, and / or an inner wall of the process fitting 6 relates.
  • the information about the spring constant refers in particular to a spring of the actuator 5, which may be provided in this, when the actuator 5 comprises a single-acting cylinder.
  • the information about the pipe diameter relates in particular to a pipe of the process fitting 6, through which, for example, the process fluid flows.
  • Switching cycles, direction changes and / or opening / closing cycles may relate in particular to the actuator 5 and / or the process fitting 6 and one each
  • the information about the lifetime can also represent a predetermined period of time.
  • the reading device 2 is formed, the characteristic information based on the
  • the database can be stored on the reading device 4 and / or on an external server to which the
  • Reading device for example via a
  • the reading device is further configured to transmit the characteristic information and optionally also the marking information to the actuating unit 2.
  • the setting unit 2 is responsible for the characteristic information based on the marking information from an internal or external
  • the setting unit 2 may be formed, for example, via the
  • Connection interface 11 a message with the
  • the reading device 4 must only be able to the actuator 2, the
  • the parameter information is already included in the marking information.
  • Actuator 2 may be configured to provide the characteristic information based on the marker information. If the provision is made by the reading device 4, then this is designed to provide the characteristic information to the
  • the software of the reading device 4 also data
  • Process valve assembly 3 and feed them via mobile phone or other wireless connection for evaluation in an external database.
  • information about its lifetime and operating conditions can be transmitted and evaluated in order to provide information on the development
  • the software of the reading device 4 can also be configured so that it receives current data via a
  • Component of the process valve assembly from an external server can relate. This can be, for example, on the one hand updated parameter information, in particular on permissible conditions of use, for example a component provided with a corresponding marking.
  • Actuator 2 and process valve assembly 3 agreed specific configuration data.
  • a device-specific threshold value for the actuator 5 and / or the process fitting 6 can be determined by the characteristic information in the actuator 2.
  • the actuator 2 can then the
  • Process valve assembly 3 - ie the actuator 5 and / or the process fitting 6 - to monitor whether this threshold is exceeded.
  • the control unit 2 is designed, in particular, to distinguish different errors during the monitoring, for example based on which threshold value has been exceeded.
  • Actuator 2 is in particular designed to set several threshold values based on the parameter information.
  • Process valve assembly 3 such as valves, and / or the actuator 2, lie outside of a typical or allowable range.
  • the configuration information can be found in particular in the
  • the characteristic information can also be used in particular as a threshold for the expected
  • the actuator 2 may be formed in the
  • Plant operator can then schedule maintenance intervals.
  • the monitoring of the process valve assembly 3 performed by the actuator 2 may also serve to check whether the actuator 2 and / or the components of the
  • Process valve unit 3 are correctly matched.
  • the actuator 5 is selected to be available in all cases
  • Evaluation of the characteristic information and an operating pressure during commissioning of the actuator 2 are detected.
  • the actuating unit 2 can be designed, in particular, to supply the process valve assembly during operation
  • the actuator 2 can estimate the forces that are necessary for the movement of the valve member 8 of the 5 by measuring pressures in pressure chambers of the actuator 5 with knowledge of the characteristic information of the actuator 5
  • Process fitting 6 are necessary. If the force values determined in this way come close to forces specified by means of the characteristic information for the process armature 6 or the actuator 5, then a corresponding warning message can be issued in particular by the actuating unit 2.
  • the monitoring performed by the setting unit 2 can also take place in interaction with a control unit from a higher level, for example the control level, and / or the higher-level control 12. If the
  • Actuator 2 itself does not muster the computing capacity for a corresponding evaluation, they can the
  • FIG. 2 shows a flow chart of a method for starting up an actuating unit 2. The method can be carried out in particular using the system 1 described above.
  • the method comprises the
  • Steps Capture Sl of a marker information that is in an optically readable mark on the
  • Process valve assembly 3 is included, by optically reading the marker, providing S2 one
  • Marking information and setting S3 of the actuator 2 so that it controls the process valve assembly 3 using the characteristic information and / or monitored.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)

Abstract

L'invention concerne un système (1) comportant les éléments suivants : une unité structurale de soupape de processus (3) comprenant une garniture de processus (6) et un actionneur (5) conçu pour l'actionnement de la garniture de processus (6), ainsi qu'une unité de réglage (2) pour la commande et/ou la surveillance de l'unité structurale de soupape de processus. Selon l'invention, l'unité structurale de soupape de processus (3) comprend au moins une marque (15, 16) pouvant être lue de manière optique et comprenant une information de marque, et le système comporte un dispositif de lecture optique (4) qui est conçu pour détecter l'information de marque par lecture optique de la marque (15, 16), l'unité de réglage (2) et/ou le dispositif de lecture (4) optique étant conçus pour fournir une information de grandeur caractéristique décrivant l'unité structurale de soupape de processus (3) sur la base de l'information de marque, et l'unité de réglage (2) étant conçue pour effectuer la commande et/ou la surveillance de l'unité structurale de soupape de processus (3) en utilisant l'information de grandeur caractéristique.
PCT/EP2017/058682 2016-04-22 2017-04-11 Système et procédé de mise en service d'une unité de réglage WO2017182332A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016206867.9 2016-04-22
DE102016206867.9A DE102016206867A1 (de) 2016-04-22 2016-04-22 System und Verfahren zur Inbetriebnahme einer Stelleinheit

Publications (1)

Publication Number Publication Date
WO2017182332A1 true WO2017182332A1 (fr) 2017-10-26

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WO (1) WO2017182332A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056046A (en) * 1989-06-20 1991-10-08 Combustion Engineering, Inc. Pneumatic operated valve data acquisitioner
DE102004005401A1 (de) 2004-02-03 2005-08-25 Jungheinrich Aktiengesellschaft Verfahren zum Einstellen des Steuerstroms von stromgesteuerten Hydraulikventilen
WO2013107466A1 (fr) * 2012-01-18 2013-07-25 Festo Ag & Co. Kg Procédé de configuration d'un module de commande fluidique, produit logiciel informatique et système fluidique
US20140100673A1 (en) * 2012-10-05 2014-04-10 Fisher Controls International Llc Methods and Apparatus for Process Device Calibration
US20140264102A1 (en) * 2013-03-14 2014-09-18 Azbil Corporation Regulating valve opening controlling system
WO2015074763A1 (fr) * 2013-11-25 2015-05-28 Gea Tuchenhagen Gmbh Système équipé d'une vanne et procédé de fonctionnement d'un tel système

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056046A (en) * 1989-06-20 1991-10-08 Combustion Engineering, Inc. Pneumatic operated valve data acquisitioner
DE102004005401A1 (de) 2004-02-03 2005-08-25 Jungheinrich Aktiengesellschaft Verfahren zum Einstellen des Steuerstroms von stromgesteuerten Hydraulikventilen
WO2013107466A1 (fr) * 2012-01-18 2013-07-25 Festo Ag & Co. Kg Procédé de configuration d'un module de commande fluidique, produit logiciel informatique et système fluidique
US20140100673A1 (en) * 2012-10-05 2014-04-10 Fisher Controls International Llc Methods and Apparatus for Process Device Calibration
US20140264102A1 (en) * 2013-03-14 2014-09-18 Azbil Corporation Regulating valve opening controlling system
WO2015074763A1 (fr) * 2013-11-25 2015-05-28 Gea Tuchenhagen Gmbh Système équipé d'une vanne et procédé de fonctionnement d'un tel système

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