EP2541074A1 - Fail-Freeze-Vorrichtung für Stellungsregler - Google Patents
Fail-Freeze-Vorrichtung für Stellungsregler Download PDFInfo
- Publication number
- EP2541074A1 EP2541074A1 EP11425167A EP11425167A EP2541074A1 EP 2541074 A1 EP2541074 A1 EP 2541074A1 EP 11425167 A EP11425167 A EP 11425167A EP 11425167 A EP11425167 A EP 11425167A EP 2541074 A1 EP2541074 A1 EP 2541074A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- primary
- actuator
- piloted
- output port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- 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
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- 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 system may have a transducer with a first type output port connectible to a valve actuator, as well as a second type input port receptive to a valve position signal.
- the valve position signal may be proportional to an output of the first type output port.
- the system may include a monitoring circuit. A pilot activation signal may being generated thereby while predefined conditions are met.
- There may also be a primary piloted valve in communication with the monitoring circuit.
- the primary piloted valve may have a first position in absence of the pilot activation signal, and a second position during receipt of the pilot activation signal.
- the valve positioner system may include a first valve coupled to the primary piloted valve.
- the first valve may have a first position corresponding to the first position of the primary piloted valve, and a second position corresponding to the second position of the primary piloted valve.
- the first type output port may be disconnected from the valve actuator while the first valve is in the first position, while the first type output port may be in fluid communication with the valve actuator while the first valve is in the second position.
- a valve positioner failsafe device may include an electro-pneumatic transducer with transducer output ports and an electrical input port receptive to a valve position signal.
- a pressure value of the transducer output may be proportional to an electrical current level value of the valve position signal.
- the device may also include an electrical current level monitoring circuit receptive to the valve position signal.
- a pilot activation signal may generated while the current value of the valve position signal remains greater than a predetermined failure value.
- There may also be a primary piloted valve including a primary piloted valve output port and a pressure line intake port. The primary piloted valve may be in communication with the current level monitoring circuit.
- first valve including a first valve pilot input port connected to the primary piloted valve output port.
- a first valve input port may be coupled to a first one of the transducer output ports, and a first valve output port may be coupled to a first one of actuator input ports of a valve actuator.
- the first valve may selectively fluidly couple the transducer to the actuator.
- a method for fail-safe regulation of a process with a valve positioner including an actuator may begin with receiving a valve position signal. Thereafter, the method may include deactivating a pilot signal to a pneumatic piloted valve. This may be in response to the valve position signal having a current value less than a predetermined failure level. The method may also include switching closed the pneumatic piloted valve in response to deactivating the pilot signal. Additionally, the method may include switching closed a first valve selectively coupling a first output of the valve positioner to a first input of the actuator. This may be in response to the switched closed pneumatic piloted valve. Pneumatic pressure to the first input of the actuator existing prior to the deactivation of the pilot signal may be maintained upon the closing of the first valve.
- 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
- 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 another embodiment of the present disclosure.
- 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.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11425167.1A EP2541074B1 (de) | 2011-06-28 | 2011-06-28 | Fail-Freeze-Vorrichtung für Stellungsregler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11425167.1A EP2541074B1 (de) | 2011-06-28 | 2011-06-28 | Fail-Freeze-Vorrichtung für Stellungsregler |
Publications (2)
Publication Number | Publication Date |
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EP2541074A1 true EP2541074A1 (de) | 2013-01-02 |
EP2541074B1 EP2541074B1 (de) | 2019-06-19 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP11425167.1A Active EP2541074B1 (de) | 2011-06-28 | 2011-06-28 | Fail-Freeze-Vorrichtung für Stellungsregler |
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EP (1) | EP2541074B1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
JP2018059632A (ja) * | 2016-10-05 | 2018-04-12 | キャタピラー インコーポレイテッドCaterpillar Incorporated | 命令されないスプールバルブポジショニングを検出して油圧アクチュエータへの流体の流れを停止させるための方法 |
EP2881595B1 (de) * | 2013-12-03 | 2018-08-22 | Ansaldo Energia IP UK Limited | Vorrichtung für Notbetrieb von Aktuatoren |
DE102018214295A1 (de) * | 2018-08-23 | 2020-02-27 | Stabilus Gmbh | Messung von Betriebsparametern an Stellenantrieben |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3943824A (en) * | 1975-01-22 | 1976-03-16 | Deere & Company | Hydraulic system |
EP0822344A2 (de) * | 1996-07-29 | 1998-02-04 | Siemens Aktiengesellschaft | Pneumatischer Regelantrieb sowie Verblockventil für einen derartigen pneumatischen Regelantrieb |
DE102005004418A1 (de) * | 2005-01-31 | 2006-08-03 | Samson Aktiengesellschaft | Stellungsregler für einen druckmittelbetriebenen Stellantrieb |
US20100037957A1 (en) * | 2008-08-12 | 2010-02-18 | Abb Technology Ag | Method and device for the activation of an electropneumatic valve of a pressure medium-actuated position controller |
-
2011
- 2011-06-28 EP EP11425167.1A patent/EP2541074B1/de active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3943824A (en) * | 1975-01-22 | 1976-03-16 | Deere & Company | Hydraulic system |
EP0822344A2 (de) * | 1996-07-29 | 1998-02-04 | Siemens Aktiengesellschaft | Pneumatischer Regelantrieb sowie Verblockventil für einen derartigen pneumatischen Regelantrieb |
DE102005004418A1 (de) * | 2005-01-31 | 2006-08-03 | Samson Aktiengesellschaft | Stellungsregler für einen druckmittelbetriebenen Stellantrieb |
US20100037957A1 (en) * | 2008-08-12 | 2010-02-18 | Abb Technology Ag | Method and device for the activation of an electropneumatic valve of a pressure medium-actuated position controller |
Non-Patent Citations (1)
Title |
---|
"Elektropneumatischer Stellungsregler SIPART PS, Siemens Katalog MP31", SIEMENS KATALOG MP31, XX, XX, 1 January 1996 (1996-01-01), pages 8/02 - 8/08, XP002090433 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2881595B1 (de) * | 2013-12-03 | 2018-08-22 | Ansaldo Energia IP UK Limited | Vorrichtung für Notbetrieb von Aktuatoren |
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 |
JP2018059632A (ja) * | 2016-10-05 | 2018-04-12 | キャタピラー インコーポレイテッドCaterpillar Incorporated | 命令されないスプールバルブポジショニングを検出して油圧アクチュエータへの流体の流れを停止させるための方法 |
DE102018214295A1 (de) * | 2018-08-23 | 2020-02-27 | Stabilus Gmbh | Messung von Betriebsparametern an Stellenantrieben |
US11543314B2 (en) | 2018-08-23 | 2023-01-03 | Stabilus Gmbh | Measurement of operating parameters on actuators |
Also Published As
Publication number | Publication date |
---|---|
EP2541074B1 (de) | 2019-06-19 |
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