EP2699806A1 - Electropneumatic position controller - Google Patents
Electropneumatic position controllerInfo
- Publication number
- EP2699806A1 EP2699806A1 EP12715905.1A EP12715905A EP2699806A1 EP 2699806 A1 EP2699806 A1 EP 2699806A1 EP 12715905 A EP12715905 A EP 12715905A EP 2699806 A1 EP2699806 A1 EP 2699806A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve group
- valve
- housing
- pressure
- electropneumatic
- 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
Links
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
- F15B20/005—Leakage; Spillage; Hose burst
-
- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
-
- 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
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
-
- 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
- F15B2211/6306—Electronic controllers using input signals representing a 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
- F15B2211/80—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
-
- 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
- F15B2211/885—Control specific to the type of fluid, e.g. specific to magnetorheological fluid
- F15B2211/8855—Compressible fluids, e.g. specific to pneumatics
Definitions
- the invention relates to an electropneumatic positioner with a supply air connection for connecting a compressed air supply line, with at least one exhaust port for connecting a pneumatic actuator of a control device and arranged in the positioner controllable valve group according to the preamble of claim 1.
- pneumatic actuators are often used as actuators in which a on an actuator, such as a connected to a closing body lifting rod, acting membrane using a gas ⁇ shaped medium, for which hereinafter generally the term "air" is used , is acted upon by variable pressure to He generation of movements.
- the pressure is restored ⁇ deposition can take place on one side, wherein the membrane on the other side is loaded with a spring, or two-sided, with different pressures cause on both sides of the membrane deflection.
- the scheme the one or more pressures by an electropneumatic positioner, in which at least one controllable valve under pressure ste ⁇ rising supply air distributed depending on the control of one or two exhaust ports to the one or both sides of the membrane in the actuator.
- a two-stage pilot valve for use in an electropneumatic positioner is known.
- a first stage four flow resistances, of which at least one flow resistance is variable, are arranged in a bridge circuit.
- Two opposite circuit points of the bridge circuit are connected to supply air or exhaust air to the environment. Between the other two circuit points is a variable in magnitude and sign pressure difference ready, the pneumatic output signal of the so in the first Stu fe realized electro-pneumatic converter for driving the downstream second stage is used.
- the second stage there is a valve group which has an actuatable by the Druckdif ⁇ ference control piston.
- a positioner and an actuator with such a positioner are known.
- the actuator has a seal, in particular a sliding seal
- a leakage chamber is provided on the side of the seal facing the pressure, which is connected to a pressure switch which, when a set pressure is exceeded, sends a signal to the sensor Positioner generated.
- a seal in particular, the usual in control valves fabric bushing comes into question.
- the signaling can be used to generate an alarm or perform a safety routine.
- the invention has for its object to provide an electropneumatic positioner, which is characterized by increased functional safety.
- the invention has the advantage that a much larger number of possibly occurring error cases can now be classified as harmless errors.
- the ratio Zvi ⁇ rule hazardous errors and dangerous errors is therefore much cheaper.
- the invention is based on the finding that material ⁇ wear, usually initially expressed with seals or membranes that are in valves of a valve assembly used as a compressed air leakage on the valves and sub ⁇ brin supply in a gas-tight housing leads to an increase in pressure within the housing at its , If a gradual or sudden leakage, for example at rupture of a membrane within the housing, so that it ent ⁇ standing pressure increase by means of a pressure switch is detected ⁇ which cooperates with the valves of the valve group and controls them so that the valve group in a predetermined safety position is offset.
- valve groups in electro-pneumatic positioners are usually housed in a separate housing anyway the, the invention is associated with only a small overhead.
- the existing housing must namely be supplemented only by a suitable housing seal.
- the pressure switch and the actuation of the valve group can to enable them at too high a pressure in interior housing Si ⁇ cherheitswolf, by electronic or electromechanical means, for example a pressure sensor with a downstream electromagnet can be realized.
- these are exclusively operated pneumatically, such that required in an advantageous manner able to operate any electric auxiliary energy, only be ⁇ restricts into ⁇ special case of field devices of the process instrumentation, which are operated with 4 to 20 mA interface is available.
- the safety position is approached completely independently of the operability of the electronics of the electropneumatic positioner and thus the functional safety ⁇ further increased.
- a diaphragm for venting the housing with a predetermined maximum air flow can be provided in a particularly advantageous embodiment of the invention.
- the housing interior is then connected via the aperture as a flow resistance with the environment of the electropneumatic positioner.
- the aperture may be sized so that an air flow of one liter per minute leads to a pressure increase of 0.8 bar in the housing interior, in which the pressure switch responds and the valve group in safety ⁇ set position.
- an electropneumatic positioner in which the valve group is preceded by an electropneumatic converter, preferably the exhaust side of the orifice is connected to the exhaust outlet of the converter.
- the position of the valve group is detected by an electronic controller, which is usually present in electropneumatic positioner, so that it outputs a signal for displaying a fault condition, for example in the form of an alarm ⁇ message via a field bus, when the Valve group is in the safety position, this state, however, does not correspond to the control of the valve group by the controller electronics and any of these downstream electro-pneumatic converter.
- an automation device or a control station as a receiver of the alarm this can be further processed and issued to an operator ⁇ so that can be initiated by this maintenance or other appropriate actions to handle the reported error condition.
- the pneumatic positioner has a pilot valve 3 and a controller electronics 4.
- An air supply connection 5 serves to connect a compressed air supply line 6, via which, for example, compressed air at 6 bar pressure to the pre ⁇ control valve 3 is supplied.
- the upper chamber 7 of the on ⁇ drive 1 is connected to an exhaust port 8 of the pilot valve.
- a supply air valve 9 compressed air from the compressed air ⁇ supply line 6 or derived from the pressure chamber 7 by means of an exhaust valve 10 via a valve outlet 11 into the environment.
- Pressure chamber 7 of the drive 1 set pressure serve the controller electronics 4, an electropneumatic converter 12, which is designed in a known manner as a bridge circuit of flow resistances, and a booster drive 13 for Be ⁇ actuation of the supply air valve 9 and the exhaust valve 10 ent ⁇ speaking the with Help of the electropneumatic converter 12 set pressure difference.
- a pressure regulator 19 By a pressure regulator 19, the supply pressure of, for example, 6 bar to a regulated pressure of, for example, 1.4 bar, which is applied to the bridge circuit of the electropneumatic converter 12, reduced.
- a valve group of the electropneumatic positioner which consists in the embodiment shown from the supply air valve 9, the exhaust valve 10 and the booster drive 13 is disposed in a gas-tight housing 14 within the position ⁇ controller.
- a pressure switch 15 the pressure prevailing within the housing 14 is monitored for maintaining a predetermined threshold value of, for example, 0.8 bar.
- All free inner spaces within the gas-tight device covers 14, 13 entge ⁇ gengoten areas, the area around the valves 9 and 10, spring chambers located in the valve group and the area around the locking mechanism of the valves are the pressure chambers of the booster actuator 9 and 10 pneumatically interconnected.
- a leak such as a crack in a membrane of the booster drive 13, so escapes compressed air through the leak in the gas-tight interior of the housing 14 and leads to a pressure increase, which is detected by the pressure switch 15.
- the pressure switch 15 As long as the pressure does not exceed a threshold value of 0.8 bar, the pressure monitor 15 does not intervene in the regulation of the position of the actuating device 2. However, as soon as the pressure rises above the limit value, the pressure monitor 15 opens the exhaust air valve 10.
- the supply air valve 9 is closed at the same time by the locking device, not shown in the figure, so that the pressure in the pressure chamber 7 of the drive 1 drops rapidly and the actuator ⁇ 2 device in the safety position, which speaks in the embodiment shown, an "Open" of the process valve corresponds, is added.
- the required switching state of the valve group is also as safety position ⁇ be distinguished.
- the process valve is arranged so that it "closes” at pressure ⁇ waste in the chamber 7.
- additional components such as the electropneumatic converter 12, the Pressure Reg 19 and / or the pressure switch 15, are additionally integrated into the housing 14.
- a diaphragm 16 is provided, which also referred to as throttle or Strö ⁇ tion resistance can be and is connected between the In ⁇ nenraum of the housing 14 and an exhaust air outlet 17 of the electropneumatic converter 12.
- the orifice 16 is for example adjusted so that a leakage of one liter per minute leads to a pressure increase of 0.8 bar in the housing 14.
- the pressure monitor 15 therefore only responds when the air flow through the throttle 16 exceeds one liter per minute. rises or when the exhaust outlet 17 of the converter 12 is clogged, for example, due to icing or contamination.
- the current position of the valves 9 and 10 is taken into account in the controller electronics 4.
- the controller electronics 4 In order to detect a response of the pressure switch 15 and thereby caused starting the safety position by the valve group with the valves 9 and 10, is additionally checked in the controller electronics 4, whether the position of the supply air valve 9 and the exhaust valve 10 with the by the control electronics 4 via the electro-pneumatic transducer 12 corresponds to the predetermined position.
- a lack of agreement with simultaneous taking of the safety position by the valve group evaluates the controller electronics 4 as a fault condition and generates a corresponding alarm message, for example, via a fieldbus 18, with which the electropneumatic positioner is integrated into an automation ⁇ network automation plant, for example, to a parent Control station ⁇ is given, so that in response to the error occurred appropriate measures can be initiated to remedy this.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Fluid Pressure (AREA)
- Fluid-Driven Valves (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011007629A DE102011007629B3 (en) | 2011-04-18 | 2011-04-18 | Electropneumatic positioner |
PCT/EP2012/056498 WO2012143265A1 (en) | 2011-04-18 | 2012-04-11 | Electropneumatic position controller |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2699806A1 true EP2699806A1 (en) | 2014-02-26 |
EP2699806B1 EP2699806B1 (en) | 2016-01-06 |
Family
ID=45998280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12715905.1A Not-in-force EP2699806B1 (en) | 2011-04-18 | 2012-04-11 | Electropneumatic position controller |
Country Status (5)
Country | Link |
---|---|
US (1) | US9534617B2 (en) |
EP (1) | EP2699806B1 (en) |
CN (1) | CN103477093B (en) |
DE (1) | DE102011007629B3 (en) |
WO (1) | WO2012143265A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012017713A1 (en) * | 2012-09-07 | 2014-03-13 | Hoerbiger Automatisierungstechnik Holding Gmbh | Fluidic actuator |
AR095272A1 (en) | 2013-03-14 | 2015-09-30 | Fisher Controls Int Llc | FORECAST OF VALVE IN FUNCTION OF LABORATORY ANALYSIS |
DE102015207121A1 (en) * | 2015-04-20 | 2016-10-20 | Rwe Power Aktiengesellschaft | System for regulating the pressure at a pressure vessel with an inert gas atmosphere |
US10060552B2 (en) * | 2016-05-18 | 2018-08-28 | Saudi Arabian Oil Company | Adaptive high integrity ESD system |
DE102017207414A1 (en) * | 2017-05-03 | 2018-11-08 | Festo Ag & Co. Kg | Pneumatic control device and process control device equipped therewith |
DE102017117335A1 (en) | 2017-07-31 | 2019-01-31 | Bürkert Werke GmbH & Co. KG | Actuation unit for a process valve and process valve |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3140397C2 (en) * | 1981-10-10 | 1993-10-21 | Bosch Gmbh Robert | Pilot-controlled device for load-independent regulation of a pressure medium flow proportional to an electrical input signal |
US4852850A (en) * | 1987-05-14 | 1989-08-01 | Westinghouse Electric Corp. | Valve system with adjustable seating force |
US4901751A (en) * | 1989-06-15 | 1990-02-20 | Systems Chemistry, Inc. | Fluid control valve and system with leak detection and containment |
DE9211165U1 (en) * | 1991-11-29 | 1992-10-29 | Arca Regler GmbH, 47918 Tönisvorst | Positioner and actuator with such a positioner |
US5251653A (en) * | 1993-02-12 | 1993-10-12 | Tucker Orrin E | Control system for automatic fluid shut-off |
DE4331966B4 (en) * | 1993-09-21 | 2005-01-05 | Wabco Gmbh & Co.Ohg | control device |
US5709239A (en) * | 1994-11-04 | 1998-01-20 | Macalello; Frank | Automatic shut-off safety device |
GB2311385B (en) * | 1996-03-23 | 2000-07-19 | Trinova Ltd | A fluid power control circuit |
DE19636418C2 (en) | 1996-09-07 | 1998-06-10 | Kaemmer Ventile Gmbh | Pneumatic actuator |
US6678584B2 (en) * | 2002-05-03 | 2004-01-13 | Fisher Controls International Llc | Method and apparatus for performing diagnostics in a control loop of a control valve |
US7124057B2 (en) * | 2003-08-19 | 2006-10-17 | Festo Corporation | Method and apparatus for diagnosing a cyclic system |
DE102004042891B3 (en) * | 2004-08-31 | 2005-10-06 | Hydac System Gmbh | Safety circuit for media-powered consumers and method of operation thereof |
DE102004048689B3 (en) * | 2004-10-06 | 2005-10-20 | Siemens Ag | Two-stage servo valve |
DE102007034060B4 (en) * | 2007-07-20 | 2012-11-08 | Siemens Ag | Actuator for an on / off valve |
DE102007034059B4 (en) * | 2007-07-20 | 2012-12-06 | Siemens Ag | Actuator for an on / off valve |
DE102008033047A1 (en) * | 2008-07-14 | 2010-02-25 | Abb Technology Ag | Signaling the active safety position for electro-pneumatic positioners |
DE102009006533B4 (en) * | 2009-01-28 | 2011-06-30 | Siemens Aktiengesellschaft, 80333 | Actuator with an open / close valve |
US8316695B2 (en) * | 2009-05-08 | 2012-11-27 | Delaware Capital Formation, Inc. | Line leak detector and method of using same |
-
2011
- 2011-04-18 DE DE102011007629A patent/DE102011007629B3/en not_active Expired - Fee Related
-
2012
- 2012-04-11 WO PCT/EP2012/056498 patent/WO2012143265A1/en active Application Filing
- 2012-04-11 US US14/112,168 patent/US9534617B2/en not_active Expired - Fee Related
- 2012-04-11 CN CN201280018977.5A patent/CN103477093B/en not_active Expired - Fee Related
- 2012-04-11 EP EP12715905.1A patent/EP2699806B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2012143265A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN103477093A (en) | 2013-12-25 |
CN103477093B (en) | 2015-11-25 |
EP2699806B1 (en) | 2016-01-06 |
WO2012143265A1 (en) | 2012-10-26 |
US20140060029A1 (en) | 2014-03-06 |
DE102011007629B3 (en) | 2012-09-27 |
US9534617B2 (en) | 2017-01-03 |
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