EP2541074B1 - Dispositif à mémoire de position en cas de panne pour positionneur - Google Patents

Dispositif à mémoire de position en cas de panne pour positionneur Download PDF

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Publication number
EP2541074B1
EP2541074B1 EP11425167.1A EP11425167A EP2541074B1 EP 2541074 B1 EP2541074 B1 EP 2541074B1 EP 11425167 A EP11425167 A EP 11425167A EP 2541074 B1 EP2541074 B1 EP 2541074B1
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EP
European Patent Office
Prior art keywords
valve
primary
signal
actuator
piloted
Prior art date
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Active
Application number
EP11425167.1A
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German (de)
English (en)
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EP2541074A1 (fr
Inventor
Flavio Tondolo
Roberto Valoti
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STI SRL
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STI SRL
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/002—Electrical failure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/30515—Load holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/87—Detection of failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/875—Control measures for coping with failures
    • F15B2211/8752—Emergency operation mode, e.g. fail-safe operation mode

Definitions

  • the present disclosure is related generally to fluid flow control and electro-hydraulic/electro-pneumatic systems, and more particularly, to a valve positioner including a failsafe that maintains the position of the valve to that of a pre-failure state.
  • a control valve regulates a flowing fluid, such as gas, steam, water, or chemical compounds by opening and closing a passageway, through which the fluid flows, with a valve element.
  • the subject flowing fluid is generally referred to as the process.
  • An actuator provides the motive force to open and close the valve element.
  • Pneumatic or hydraulic energy is converted by the actuator to rotational or linear motion, depending on the configuration of the valve element.
  • pneumatic systems are utilized for valve actuators due to several distinct advantages. For instance, air, rather than fluids such as oil, is exhausted into the atmosphere, and compressed air is better able to absorb excess pressure and pressure spikes. There are other peripheral advantages such as fewer maintenance requirements.
  • a conventional pneumatic actuator is comprised of a piston sealed within a cylinder, and the piston including a connecting rod that is mechanically coupled to the valve element. Compressed air is forced into and out of the cylinder to move the connecting rod. In a single-acting actuator, the compressed air is taken in and exhausted from one end of the cylinder and is opposed by a range spring, while in a double-acting actuator, air is taken in one end of the cylinder while simultaneously exhausting it out of the opposing end.
  • valve positioners which can cooperate with aforementioned pneumatic actuators, are well known in the art.
  • the proportional movement of the actuator is accomplished by the movement of compressed air into and out of the actuator piston, as indicated above.
  • valve positioners incorporate a spool (or other devices) that either rotates or slides axially in a housing the port the flow of compressed air to the actuator or to one or more exhaust ports.
  • an electrical control circuit provides a variable current signal to the positioner device that proportionally corresponds to particular states of the actuator and hence a particular position of the control valve.
  • the electrical control circuit and the electrical current signals generated thereby may be part of a broader process managed by a distributed control system (DCS).
  • DCS distributed control system
  • the electrical current varies between 4 milliamps (mA) and 20 mA according to industry-wide standards; at 4 mA the valve positioner may fully open the valve element, while at 20mA the valve positioner may fully close the valve element.
  • the positioner compares the received electrical signal to the current position of the actuator, and if there is a difference, the actuator is moved accordingly until the correct position is reached.
  • valve positioner with a failsafe that maintains the position of the valve to that of a pre-failure state.
  • a valve positioner that includes a fail-freeze function powered from the electrical current signal loop thereto without an external source.
  • valve positioners with a fail-freeze function that are intrinsically safe.
  • a valve positioner according to the invention is defined in claim 1.
  • FIG. 1 illustrates a valve positioner failsafe system 10 in accordance with one embodiment of the present disclosure.
  • a positioner device 12 coupled to a valve actuator 14 that modifies the position of a control valve (not shown) in regulating a part of a fluid flow process.
  • the valve actuator 14 includes a cylinder body 16 defining a chamber 18.
  • a piston 20 reciprocates within the cylinder body 16 as compressed air is supplied and exhausted therefrom.
  • the piston 20 is mechanically coupled to a connecting rod 22, which in turn is coupled to the control valve.
  • the particular configuration of the linear valve actuator 14 is presented by way of example only, and any other type of actuator, such as a rotary type or a diaphragm type may be substituted.
  • valve positioner failsafe system 10 The components of the valve positioner failsafe system 10 are variously described herein as being driven by compressed air, though it will be appreciated that any other inert gasses may be utilized. Along these lines, other fluid power systems such as hydraulics may be substituted without departing from the scope of the present disclosure. As indicated above, however, compressed air offers several advantages with respect to response times and safety in potentially hazardous industrial environments.
  • the illustrative example shows a first fluid flow passageway 24 and a second fluid flow passageway 26 defined by the cylinder body 16, which is characteristic of a double-acting actuator in which compressed air is supplied to one side of the chamber 18 while the other side is exhausted. It is expressly contemplated, however, that a single-acting actuator with spring return may be used instead, along with attendant modifications to the configuration of the positioner device 12.
  • the positioner device 12 The supplying and exhausting of the compressed air to the valve actuator 14 is governed by the positioner device 12, an exemplary variation of which is illustrated in FIG. 2 .
  • the positioner device 12 may also be referenced as valve position controller or a servomechanism, and its components enclosed within a housing 28.
  • the positioner device 12 includes a pressure line intake port 30, a first output port 32, and a second output port 34, each of which define openings on the housing 28 receptive to connecting hoses.
  • the first output port 32 is in fluid communication with the first fluid flow passageway 24 of the valve actuator 14 over a first pneumatic connecting line 36
  • the second output port 34 is in fluid communication the second fluid flow passageway 26 of the valve actuator 14 over a second pneumatic connecting line 38.
  • the first and second output ports 32, 34 may also referenced as first type output ports, that is, pneumatic type output ports, as distinguished from electrical or hydraulic type output ports.
  • the pressure line intake port 30 receives compressed air from a pressure line 40 coupled to
  • the basic function of the positioner device 12 involves the selective porting of compressed air from the pressure line 40 to the first fluid passageway 24 and the second fluid flow passageway 26 of the valve actuator 14 to provide a motive force thereto such that the position of the control valve can be adjusted.
  • the volume of compressed air flowing to the valve actuator 14 depends upon an external input, which according to one embodiment, is a valve position signal 42 provided to the positioner device 12 over a two-wire connection 44.
  • Input ports receptive to the two-wire connection 44 are also referred to as a second type input port, that is, an electrical input port, distinguished from a first type (pneumatic) port.
  • the two-wire connection 44 is linked to a central regulator station that transmits the valve position signal 42 to the positioner device 12. It is understood that there may be other positioner devices 12 connected to the central regulator station, in which other related or unrelated processes and control valves therefor are managed.
  • valve position signal 42 is an analog current ranging between 4 mA and 20mA. Although the basic operation of the valve positioner failsafe system 10 does not require it, the valve position signal 42 can carry a digital signal utilized by positioner device 12 for additional functionality such as diagnostics, configuration, and so forth, and is accordingly HART compliant (Highway Addressable Remote Transducer). As will be described in further detail below, the valve position signal 42 also provides electrical power to the positioner device 12 and other associated components.
  • the valve position signal 42 can be quantified as a percentage of the fully open or fully closed position of the control valve, and more specifically, as the pressure of the compressed air that is ported from the pressure line intake port 30 to the first and second output ports 30, 32 for achieving that position. For example, upon proper calibration, a 0% (4 mA) input signal may be defined as the fully closed position, while a 100% signal (20mA) input signal may be defined as the fully open position. A 12 mA signal may thus represent a 50% position.
  • An electro-pneumatic transducer 46 receives the valve position signal 42.
  • a feedback sensor reads the actual position of the valve actuator and transmits a signal representative thereof to the microprocessor 48.
  • the valve position signal 42 includes a set point or reference value, to which the value of the actual position signal is compared.
  • the transducer 46 is then adjusted to supply more or less compressed air to the valve actuator 14 to position the same to the designated set point.
  • a variety of different algorithms may be used to effect a change in the flow rate of compressed air to the valve actuator 14.
  • FIG. 3 best illustrates the various electrical connections to the positioner device 12 included in a terminal block 50.
  • a valve position terminal group 52 includes a set point line and a return (negative) line that is connected to ground.
  • An analog feedback terminal group 54 includes an input line connected to the aforementioned valve position feedback sensor.
  • a digital input terminal group 56 including a plurality of input lines, as well as a digital output terminal group 58 including a voltage supply line (SUP) and a plurality of output lines (OP1, OP2), the uses for which will be described in greater detail below.
  • the return line (RET) of the digital output terminal group 58 is also tied to the return line of the valve position terminal group 52.
  • the housing 28 also defines electrical adapter ports 52, through which the various connectors for the two-wire connection 44 are routed.
  • the positioner device 12 is understood to be suitable for hazardous environments where flammable gasses in the environment have the potential to ignite from sparks typical in regular circuits and constituent components thereof.
  • the positioner device 12 is understood to be intrinsically safe, in that, among other things, the electrical components and any others devices utilized therein operate on low voltages.
  • valve positioner failsafe system 10 is contemplated to include a "fail-freeze” function.
  • "fail-freeze” refers to a function where the position of the actuator device 14 is held to that most recent prior to failure. These failures include loss of power due to the two-wire connection 44 being disconnected from the signal source, a loss of pressure in the pressure line 40, loss of the actuator position feedback signal, and so forth.
  • the present disclosure includes a description of one embodiment where the loss of electrical power triggers the fail-freeze function, and is presented by way of example only and not of limitation. Other failure conditions such as those enumerated above may also trigger the fail-freeze function, and it is understood that other embodiments of the valve positioner failsafe system 10 may be adapted thereto.
  • the positioner device 12 includes a monitoring circuit 62. Although depicted as being a part of the positioner device 12, it is expressly contemplated that the monitoring circuit 62 can be an independent device.
  • the monitoring circuit 62 is placed in series with the two-wire connection 44 to the pneumatic transducer 46, and accordingly, is receptive to the incoming valve position signal 42. As indicated above, the valve position signal 42 powers the monitoring circuit 62 by virtue of powering the positioner device 12.
  • the current supplied to the pneumatic transducer 46 is understood to be in the same 4-20 mA range discussed previously.
  • input voltage to the pneumatic transducer 46 is understood to be within the range of 12 to 30 volts. With the series addition of the monitoring circuit 62, the input voltage range may increase to 20 to 30 volts.
  • the monitoring circuit 62 in accordance with one embodiment of the present disclosure continuously evaluates the electrical current level of the valve position signal 42. So long as the electrical current level remains above a predefined failure level, a pilot activation signal 64 is generated on a monitor output line 66.
  • this predefined failure level may be 3.7 mA in where a proper signal has a range between 4 mA and 20 mA.
  • the pilot activation signal 64 can also remain on while such other failure conditions are not detected. Therefore, appropriate threshold values of monitored conditions such as system-wide compressed air pressure, position feedback error rate, and so forth, can be preset.
  • the valve positioner failsafe system 10 also includes a primary piloted valve 68 that is in communication with the monitoring circuit 62.
  • the primary piloted valve 68 includes a piezoelectric (or any other low power) pilot element 70 with a positive line 72 and a negative line 74.
  • the positive line 72 is in turn connected to the voltage supply line (SUP) of the digital output terminal group 58, as well as the return (negative) line of the valve position terminal group 52.
  • SUP voltage supply line
  • the piezoelectric pilot element 70 is placed in series with the two-wire connection 44 and is also powered thereby.
  • a low or an open value is output to the digital output line (OP1) on the digital output terminal group 58 as the pilot activation signal 64.
  • the pilot activation signal 64 and hence the primary piloted valve 68 remains on.
  • the piezoelectric pilot element 70 is powered off and the primary piloted valve 68 is deactivated.
  • the primary piloted valve 68 is understood to be a conventional normally closed three/two way valve with spring return. Power consumption is understood to be approximately 6 millwatts (mW), and while having a very low fluid flow rate (CV), further work may be performed with its output. Such low power devices are also known to be intrinsically safe and suitable for use in hazardous environments.
  • the primary piloted valve 68 has a pressure line intake port 76 coupled to the pressure line 40, a primary output port 78, and a secondary output port 80.
  • the pressure line intake port 76 In its normally closed or deactivated first position, the pressure line intake port 76 is not in fluid communication with neither the primary output port 78 nor the secondary output port 80. Instead, the primary output port 78 is in fluid communication with the secondary output port 80 that is being exhausted.
  • the pressure line intake port 76 In the activated, second position of the primary piloted valve 68, the pressure line intake port 76 is in fluid communication with the primary output port 78.
  • compressed air from the pressure line 40 flows through and other work is performed therewith.
  • the primary output port 78 is in fluid communication with a first pneumatic pilot 82 of a first valve 86, as well as a second pneumatic pilot 84 of a second valve 88.
  • the first and second valves are understood to be normally closed two-position valves with spring return that are interposed between the positioner device 12 and the valve actuator 14. More particularly, the first valve 84 has a first input port 90 in direct fluid communication with the first output port 32 of the positioner device 12 over the first pneumatic connecting line 36, and a first output port 92 in direct fluid communication with the first fluid flow passageway 24 of the valve actuator 14.
  • the second valve 88 has a second input port 94 in direct fluid communication with the second output port 34 of the positioner device 12 over the second pneumatic connecting line 38, and a second output port 96 in direct fluid communication with the second fluid flow passageway 26 of the valve actuator 14.
  • the first valve 84 and the second valve 88 remain in a first closed position in which the first input port 90 and the second input port 94 are obstructed from the first output port 92 and the second output port 96, respectively.
  • the first pneumatic pilot 82 is activated by a flow of compressed air from the primary output port 78 of the primary piloted valve 68, the first valve 84 and the second valve 88 are turned on, thereby connecting the first input port 90 and the second input port 94 to the first output port 92 and the second output port 96, respectively.
  • the first valve 84 and the second valve 88 are deactivated, the pressure at the first fluid flow passageway 24 and the second fluid flow passageway 26, respectively, are maintained at levels immediately prior to such first and second valves 84, 88 being triggered off.
  • a method for fail-safe regulation of a process with the positioner device 12 and the valve actuator 14 is contemplated in accordance with an embodiment of the present invention.
  • the method begins with a step 200 of receiving the valve position signal 42 over the two-wire connection 44.
  • the method then continues with a step 202 of deactivating the pilot activation signal 64 that is being transmitted to the primary piloted valve 68. This is understood to occur in response to the valve position signal 42 having an electrical current value less than a predetermined failure level or threshold, as noted above and evaluated in decision step 201.
  • step 204 of switching closed the primary piloted valve 68. Turning off the flow of compressed air through the primary piloted valve 68 also deactivates the first pneumatic pilot 82 and the second pneumatic pilot 86. Thereafter, according to step 206, the first valve 84 and the second valve 88 are switched closed. This, in turn, has the effect of cutting off the flow of compressed air from the positioner device 12 to the valve actuator 14, and holding the pressure to the valve actuator 14 from just before the deactivation of the pilot activation signal 64.
  • step 206 the state of the valve positioner failsafe system 10 as of step 206 is maintained, that is, the valve actuator is kept in a "fail freeze" position.
  • step 208 the electrical current value is greater than or equal to the predetermined failure level or threshold.
  • the method continues with a step 208 of generating a delay. This delay is understood to correspond to the delay in restarting the positioner device 12.
  • the primary piloted valve 68 is reactivated. This, in turn, activates the first pneumatic pilot 82 and the second pneumatic pilot 86, switching the first valve 84 and the second valve 88, respectively, to the opened second position. The flow of compressed air from the positioner device 12 to the valve actuator 14 therefore resumes.

Claims (5)

  1. Système de positionnement de vanne comprenant:
    - un dispositif de positionnement (12) comprenant un circuit de contrôle (62), un transducteur (46), une ouverture de sortie pneumatique (32) pouvant être connectée à un actionneur de vanne (14) et une ouverture d'entrée électrique capable de recevoir un signal de position (42) de la vanne électrique, le signal de position de la vanne étant proportionnel à une sortie pneumatique de l'ouverture de sortie pneumatique qui est réglée pour positionner l'actionneur de vanne à un point de positionnement défini; dans lequel le circuit de contrôle (62) est capable de recevoir le signal de position de la vanne, et un signal d'activation pilote (64) est généré de cette manière, si des conditions prédéterminées sont satisfaites;
    - une vanne pilote principale (68) à commande électrique est en communication avec le circuit de contrôle (62), la vanne pilote principale (68) prenant une première position en l'absence d'un signal d'activation pilote; et
    - une première vanne 886) à contrôle pneumatique est couplée de façon pneumatique à la vanne pilote principale (68), la première vanne (86) prenant une première position correspondant à la première position de la vanne pilote principale (68);
    dans lequel l'ouverture de sortie pneumatique du transducteur (46) est déconnecté de l'actionneur de vanne (14) dans la première position;
    dans lequel le signal de position (42) de la vanne fournit également de l'énergie électrique au dispositif de positionnement (12) et au signal d'activation pilote (64);
    dans lequel la vanne pilote principale (68) comprend une vanne pilote à basse énergie activée avec le signal d'activation pilote (64);
    dans lequel la condition prédéterminée est la valeur du courant électrique du signal de position (42) de la vanne, qui reste supérieure à une valeur de défaut prédéterminée;
    dans lequel, lorsque la valeur du courant électrique du signal de position de la vanne (42) reste supérieure à une valeur de défaut prédéterminée après un délai généré d'une manière prédéterminée, la vanne pilote principale (68) prend une deuxième position pendant la réception du signal d'activation pilote;
    la première vanne (86) prend une deuxième position correspondant à la deuxième position de la vanne pilote principale (68); et
    l'ouverture de sortie pneumatique (32) est en communication fluidique avec l'actionneur de la vanne, tandis que la première vanne est dans la deuxième position.
  2. Système de la revendication 1, dans lequel:
    le transducteur (46) comprend une ouverture d'entrée pneumatique connectée à une conduite de pression.
  3. Système selon la revendication 2, dans lequel une valeur de pression d'une sortie de l'ouverture de sortie pneumatique (32) est automatiquement actionnée par le transducteur (46), qui fonctionne de manière à comparer une valeur de courant électrique du signal de position de la vanne à une position existante de l'actionneur de la vanne (14) et, éventuellement, à déplacer l'actionneur de la vanne (14) dans une position correcte, à la suite d'une telle comparaison.
  4. Système selon la revendication 3, dans lequel le signal de position de la vanne a une valeur de courant nominal comprise entre 4 et 20 milliampères (mA).
  5. Système selon la revendication 1, comprenant en outre:
    une deuxième vanne couplée à la vanne pilote principale (68), la deuxième vanne prenant une première position correspondant à la première position de la vanne pilote principale (68), l'ouverture de sortie pneumatique étant déconnectée de l'actionneur de la vanne (14), tandis que la deuxième vanne est dans la première position.
EP11425167.1A 2011-06-28 2011-06-28 Dispositif à mémoire de position en cas de panne pour positionneur Active EP2541074B1 (fr)

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EP11425167.1A EP2541074B1 (fr) 2011-06-28 2011-06-28 Dispositif à mémoire de position en cas de panne pour positionneur

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Application Number Priority Date Filing Date Title
EP11425167.1A EP2541074B1 (fr) 2011-06-28 2011-06-28 Dispositif à mémoire de position en cas de panne pour positionneur

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EP2541074A1 EP2541074A1 (fr) 2013-01-02
EP2541074B1 true EP2541074B1 (fr) 2019-06-19

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Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
EP2881595B1 (fr) * 2013-12-03 2018-08-22 Ansaldo Energia IP UK Limited Dispositif pour un fonctionnement d'urgence d'actionneurs
CN104483572A (zh) * 2014-12-19 2015-04-01 重庆川仪自动化股份有限公司 一种阀门定位器精度测试方法、装置和系统
US10233951B2 (en) * 2016-10-05 2019-03-19 Caterpillar Inc. Method to detect uncommanded spool valve positioning and stop fluid flow to hydraulic actuators
DE102018214295A1 (de) * 2018-08-23 2020-02-27 Stabilus Gmbh Messung von Betriebsparametern an Stellenantrieben

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US3943824A (en) * 1975-01-22 1976-03-16 Deere & Company Hydraulic system
DE29613138U1 (de) * 1996-07-29 1997-09-04 Siemens Ag Pneumatischer Regelantrieb sowie Verblockventil für einen derartigen pneumatischen Regelantrieb
DE102005004418B4 (de) * 2005-01-31 2006-11-23 Samson Aktiengesellschaft Stellungsregler für einen druckmittelbetriebenen Stellantrieb
DE102008038723B3 (de) * 2008-08-12 2010-04-15 Abb Technology Ag Verfahren und Einrichtung zur Ansteuerung eines elektropneumatischen Ventils eines druckmittelbetätigten Stellungsreglers

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