EP3286438B1 - System for pressure regulation at a pressurized inert gas container - Google Patents

System for pressure regulation at a pressurized inert gas container Download PDF

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Publication number
EP3286438B1
EP3286438B1 EP16720730.7A EP16720730A EP3286438B1 EP 3286438 B1 EP3286438 B1 EP 3286438B1 EP 16720730 A EP16720730 A EP 16720730A EP 3286438 B1 EP3286438 B1 EP 3286438B1
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EP
European Patent Office
Prior art keywords
valve
actuating
pressure
pressure regulating
regulating valve
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Application number
EP16720730.7A
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German (de)
French (fr)
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EP3286438A1 (en
Inventor
Andreas HOYER
Frank Huth
Frank Manuel Elsen
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RWE Power AG
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RWE Power AG
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Priority to PL16720730T priority Critical patent/PL3286438T3/en
Publication of EP3286438A1 publication Critical patent/EP3286438A1/en
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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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure 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
    • F15B2211/50—Pressure control
    • F15B2211/565—Control of a downstream 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
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/862—Control during or prevention of abnormal conditions the abnormal condition being electric or electronic failure
    • F15B2211/8623—Electric supply 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
    • F15B2211/80—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
    • F15B2211/875—Control measures for coping with failures
    • F15B2211/8755—Emergency shut-down
    • 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 a system for regulating the pressure in an overpressure container with an inert gas atmosphere.
  • overpressure containers must be designed in such a way that a slight overpressure prevails in them to maintain the inert gas atmosphere and any overpressure peaks are reduced to prevent the container from bursting.
  • Typical pressurized containers with an inert gas atmosphere are, for example, tube dryers or fluidized bed dryers for drying lignite. Dry lignite in particular has a significant tendency to spontaneously ignite, so that drying must be carried out in any case in an inert gas atmosphere.
  • the overpressure in the process space of the container is achieved, for example, in a fluidized bed dryer when starting up by introducing nitrogen or water vapor or during drying operation by evaporating the water contained in the raw brown coal.
  • Fluidized bed dryers as overpressure containers are usually provided with pressure control flaps, at least one flap being held in the closed position by means of spring force and being able to be opened for the purpose of overpressure protection against the spring force. At least one further pressure control flap is provided to seal the overpressure container in the event of a pressure drop.
  • This pressure control valve is designed in such a way that it closes against a spring force.
  • the DE 44 29 401 A1 describes a fluid operated actuator.
  • This has a pneumatic drive which is connected to a pneumatic unit via a supply air line and which can be moved into a desired position via the pneumatic unit against a spring force.
  • the pneumatic unit in turn has a main stage in the form of a 3/2-way valve.
  • the pneumatic unit has a pilot stage, by means of which a baffle plate which is prestressed by means of a spring can be adjusted.
  • the pilot stage is coupled to the main stage via a control channel, the main stage being controllable by means of the pilot stage.
  • the pilot stage receives control signals from electronics, the control signals being transmitted from the electronics to the pilot stage via a relay. In the event of a power failure, the relay switches on so that no control signals are transmitted from the electronics to the pneumatic unit, whereupon the pneumatic drive is brought into a desired position, a so-called fail-safe position, by means of the spring.
  • the invention is therefore based on the object of providing a system for regulating the pressure in an overpressure container with an inert gas atmosphere, which is simplified compared to the prior art and which in particular meets the safety requirements with regard to susceptibility to failure.
  • the system should be particularly easy to regulate in a fail-safe manner in order to be able to set the overpressure in the overpressure container within appropriate limits.
  • One aspect of the invention relates to a system for regulating the pressure on an overpressure container with an inert gas atmosphere, comprising a
  • Container pressure regulating valve a control device for controlling the container pressure regulating valve, wherein the container pressure regulating valve is designed to close automatically when there is negative pressure inside the container, an actuating device controllable by the control device for actuating the container pressure regulating valve against a closing force that causes the container pressure regulating valve to automatically close, the actuating device being pneumatically actuated , an operating pressure supply line connected to the actuating device, an actuating pressure control valve for actuating the actuating device and means for pressure relief of the actuating device in the event of failure of an electrical supply voltage of the control device.
  • Such a configuration of the system for regulating the pressure in an overpressure container allows both the safe opening of the container pressure control valve when the pressure rises and the safe closing of the container pressure control valve, the system according to the invention having the particular advantage that only a single container pressure control valve is required is.
  • This container pressure regulating valve can be designed as a relatively large "pressure regulating flap" which is pretensioned in the closing direction by means of a spring, for example.
  • the actuating device can be acted upon with compressed air, for example via a compressed air network with a compressed air source.
  • the actuating device is connected to an operating pressure supply line of the compressed air network.
  • An electrically controllable vent valve for example, can be provided as a means for pressure relief of the actuating device, which is normally open in the first switching position and in the open first switching position causes a pneumatic relief of the actuating device so that in the event of a power failure the actuating device is immediately depressurized and the container pressure control valve is automatically activated moved to the closed position.
  • the vent valve is arranged in a pneumatic control line of the actuating pressure regulating valve, the vent valve in a second switching position causing the control line to be loaded with a control pressure.
  • the actuating pressure regulating valve is vented via the control line of the actuating pressure regulating valve.
  • the actuating pressure regulating valve can be controlled via a pilot valve.
  • the pilot valve expediently acts on a control input of the actuating pressure regulating valve.
  • pilot valve and the venting system are connected in series in the pneumatic control line.
  • the pilot valve can control the actuating pressure regulating valve or switch through the control pressure acting on the control input of the actuating pressure regulating valve.
  • the pneumatic control line and the operating pressure supply line can, for example, be connected in parallel, the actuating pressure regulating valve actuating the pneumatic actuating device against the closing force depending on the control.
  • actuating pressure control valve is designed as a pressure booster.
  • the control device which specifies the control pressure for the actuating pressure regulating valve, is preferably arranged in the pneumatic control line of the actuating pressure regulating valve, the pilot valve in a first Switching position bridged by the control device and wherein, preferably in a second actuated switching position, the control pressure predetermined by the control device is applied to an output of the pilot valve. If the vent valve is also in the second actuated switching position, the control pressure is applied to the actuating pressure regulating valve or to its control input.
  • the vent valve is expediently designed as a solenoid valve which, when energized, connects the pneumatic control line to the actuating pressure regulating valve and which, when de-energized, releases a vent path so that the actuating device is pneumatically relieved. In the event of a power failure, it can be ensured in this way that the load on the actuating device is relieved, so that maintenance of the inert gas atmosphere within the overpressure container is guaranteed in any case.
  • the pilot valve can also be designed as a solenoid valve, which connects the pneumatic control line to the actuating pressure regulating valve without current. Since the pilot valve and the vent valve are connected in series, a power failure causes the vent valve to close the pneumatic control line and open a vent path of the actuating pressure control valve.
  • it comprises at least one compressed air buffer between a compressed air source and the operating pressure supply line, so that it is ensured that reliable actuation of the container pressure regulating valve is possible even if the compressed air network is not available.
  • a fluidized bed dryer for coal, in particular for lignite, or a tube dryer for coal, in particular for lignite, is preferably provided as the pressurized container.
  • the invention is explained below using an exemplary embodiment shown in the drawing.
  • the drawing shows a schematic Representation of the tank pressure control valve within a pneumatic circuit diagram.
  • the overpressure tank is not shown in the circuit diagram.
  • the container pressure regulating valve 1 comprises a valve body 2 which is held in the valve seat via a closing rod 3 and via a compression spring 4 acting on the closing rod 3.
  • the closing rod 3 can be actuated against the spring force and compression spring 4 via a pneumatic actuating device 5.
  • the pneumatic control device 5 is in operative connection with an actuation pressure control valve 6, the actuation pressure control valve 6 being designed as a pressure booster.
  • the actuating pressure regulating valve 6 is connected to a compressed air network 8 via an operating pressure supply line 7.
  • the actuating pressure regulating valve 6 furthermore comprises a control input to which a pneumatic control line 9 is connected.
  • the pneumatic control line 9 is pneumatically laid parallel to the operating pressure supply line 7, a pilot valve 10 and a vent valve 11 being arranged in series in the pneumatic control line 9.
  • the pressure in the pneumatic control line is specified via a control device 12, which is designed as a pressure control unit.
  • the control device 12 is connected in parallel to a branch 13 of the operating pressure supply line 7.
  • the circuit diagram shows the pilot valve 10 normally open, whereas the vent valve 11 is also shown in the de-energized position; this position is the vent position of the vent valve 11 in which the actuating pressure control valve 6 is vented. In this switching position the actuating device 5 is not actuated or the actuating device 5 is relieved.
  • the pilot valve 10 is designed as a three / two-way valve, just like the vent valve 11 is designed as a three / two-way valve.
  • the control pressure specified by the control device 12 is present at an output of the pilot valve 10 on the pneumatic control line 9. If the vent valve 11 is also in the second switching position (energized state, not shown), the control pressure of the pneumatic control line 9 is applied to a control input of the actuating pressure regulating valve 6 (not shown).
  • the amplified control pulse emitted by the actuating pressure regulating valve 6, which acts on the pneumatic actuating device 5, is proportional to the differential pressure between the pneumatic control line 9 and the operating pressure supply line 7. In this case (control operation), a maximum pressure boosting takes place via the actuating pressure regulating valve 6 when the differential pressure between the pneumatic control line 9 and the operating pressure supply line 7 is zero.
  • the position of the container pressure regulating valve 1 against the closing force of the compression spring 4 can thus be regulated between 0% (closed) and 100% (full opening) via the control device 12.
  • a total of three operating cases can be implemented with the interconnection described.
  • the vent valve 11 is in the position shown, in which venting of the actuating pressure control valve 6 takes place via the pneumatic control line 9, as a result of which the container closes automatically via the compression spring 4.
  • the pilot valve 10 In normal operation (case II) the pilot valve 10 is activated and is in the second switching position, not shown.
  • the vent valve 11 is also energized and activated and is also in the second switching position, not shown.
  • the control pressure in the pneumatic control line 9 is specified via the control device 12.
  • the control pressure of the pneumatic control line 9 is applied both to an input of the pilot valve 10 and to the output of the pilot valve 10. Furthermore, the control pressure is applied to an input of the vent valve 11 and to the output of the vent valve 11.
  • the differential pressure between the pneumatic control line 9 and the operating pressure supply line 7 specifies the switching position of the pneumatic actuating device 5.
  • case III describes the quickest possible opening of the container in the event of overpressure.
  • the pilot valve 10 is de-energized, for example via a pressure sensor in the overpressure container, that is to say moved into the first switching position shown, in which the control device 12 is bypassed.
  • the full operating pressure that prevails in the branch 13 of the operating pressure supply line 7 is present at the inlet of the pilot valve 10.
  • This full operating pressure is also applied to the inlet of the vent valve 11.
  • the vent valve 11 remains energized and in this case is in the second switching position, so that the full operating pressure is also applied to the control input of the actuating pressure regulating valve.
  • an operating pressure of 6 bar can be applied in the operating pressure supply line 7 as well as in the pneumatic control line 9.
  • This pressure is increased by means of the actuating pressure regulating valve 6 to actuate the container pressure regulating valve 1 against the closing force of the compression spring 4.
  • both the pilot valve 10 and the vent valve 11 would assume the position shown in the circuit diagram, in which the actuating pressure regulating valve 6 is depressurized or vented and the actuating device 5 is then depressurized, which causes the actuating pressure regulating valve 6 to close by means of the compression spring 4.

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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)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

Die Erfindung betrifft ein System zur Regelung des Drucks an einem Überdruckbehälter mit Inertgasatmosphäre.The invention relates to a system for regulating the pressure in an overpressure container with an inert gas atmosphere.

Solche Überdruckbehälter müssen so ausgelegt sein, dass in diesen ein leichter Überdruck zur Aufrechterhaltung der Inertgasatmosphäre vorherrscht und etwaige Überdruckspitzen abgebaut werden, um ein Bersten des Behälters zu verhindern. Typische Überdruckbehälter mit Inertgasatmosphäre sind beispielsweise Röhrentrockner oder Wirbelschichttrockner zur Trocknung von Braunkohle. Insbesondere trockene Braunkohle hat eine signifikante Selbstentzündungsneigung, so dass eine Trocknung jedenfalls in einer Inertgasatmosphäre durchgeführt werden muss. Der Überdruck im Prozessraum des Behälters wird beispielsweise bei einem Wirbelschichttrockner beim Anfahren durch Einleiten von Stickstoff oder Wasserdampf oder während des Trocknungsbetriebs durch Verdampfen des in der Rohbraunkohle enthaltenen Wassers erreicht.Such overpressure containers must be designed in such a way that a slight overpressure prevails in them to maintain the inert gas atmosphere and any overpressure peaks are reduced to prevent the container from bursting. Typical pressurized containers with an inert gas atmosphere are, for example, tube dryers or fluidized bed dryers for drying lignite. Dry lignite in particular has a significant tendency to spontaneously ignite, so that drying must be carried out in any case in an inert gas atmosphere. The overpressure in the process space of the container is achieved, for example, in a fluidized bed dryer when starting up by introducing nitrogen or water vapor or during drying operation by evaporating the water contained in the raw brown coal.

Sicherheitstechnisch ist es erforderlich, einen möglichen Druckanstieg über die Auslegungsgrenzen des Druckbehälters abzusichern sowie das Ansaugen von Umgebungsluft in den Wirbelschichttrockner beim Auftreten von Unterdruck zu verhindern.In terms of safety, it is necessary to safeguard a possible pressure increase beyond the design limits of the pressure vessel and to prevent ambient air from being sucked into the fluidized bed dryer when negative pressure occurs.

Wirbelschichttrockner als Überdruckbehälter nach dem Stand der Technik sind üblicherweise mit Druckregelklappen versehen, wobei wenigstens eine Klappe mittels Federkraft in der geschlossenen Stellung gehalten wird und zwecks Überdruckabsicherung gegen die Federkraft geöffnet werden kann. Wenigstens eine weitere Druckregelklappe ist zur Abdichtung des Überdruckbehälters bei Druckabfall vorgesehen. Diese Druckregelklappe ist so ausgelegt, das sie gegen eine Federkraft schließt.Fluidized bed dryers as overpressure containers according to the prior art are usually provided with pressure control flaps, at least one flap being held in the closed position by means of spring force and being able to be opened for the purpose of overpressure protection against the spring force. At least one further pressure control flap is provided to seal the overpressure container in the event of a pressure drop. This pressure control valve is designed in such a way that it closes against a spring force.

Eine solche Anordnung ist verhältnismäßig aufwendig, da bei verhältnismäßig großen Überdruckbehältern die Druckregelklappen beziehungsweise die Druckregelventile entsprechende Dimensionen aufweisen.Such an arrangement is relatively complex, since in the case of relatively large overpressure containers the pressure control flaps or the pressure control valves have corresponding dimensions.

Die DE 44 29 401 A1 beschreibt einen druckmittelbetriebenen Stellantrieb. Dieser weist einen pneumatischen Antrieb auf, der über eine Zuluftleitung mit einer pneumatischen Einheit verbunden ist und über die pneumatische Einheit entgegen einer Federkraft in eine gewünschte Stellung verfahrbar ist. Die pneumatische Einheit wiederrum weist eine Hauptstufe in Form eines 3/2-Wegeventils auf. Ferner weist die pneumatische Einheit eine Vorsteuerstufe auf, mittels der eine mittels einer Feder vorgespannte Prallplatte verstellbar ist. Die Vorsteuerstufe ist über einen Ansteuerkanal mit der Hauptstufe gekoppelt, wobei die Hauptstufe mittels der Vorsteuerstufe steuerbar ist. Die Vorsteuerstufe empfängt von einer Elektronik Steuersignale, wobei die Steuersignale über ein Relais von der Elektronik an die Vorsteuerstufe übertragen werden. Bei einem Stromausfall schaltet das Relais auf, sodass keine Steuersignale von der Elektronik an die pneumatische Einheit übertragen werden, woraufhin mittels der Feder der pneumatische Antrieb in eine gewünschte Stellung, eine sogenannte Fail-Safe-Stellung verbracht wird.The DE 44 29 401 A1 describes a fluid operated actuator. This has a pneumatic drive which is connected to a pneumatic unit via a supply air line and which can be moved into a desired position via the pneumatic unit against a spring force. The pneumatic unit in turn has a main stage in the form of a 3/2-way valve. Furthermore, the pneumatic unit has a pilot stage, by means of which a baffle plate which is prestressed by means of a spring can be adjusted. The pilot stage is coupled to the main stage via a control channel, the main stage being controllable by means of the pilot stage. The pilot stage receives control signals from electronics, the control signals being transmitted from the electronics to the pilot stage via a relay. In the event of a power failure, the relay switches on so that no control signals are transmitted from the electronics to the pneumatic unit, whereupon the pneumatic drive is brought into a desired position, a so-called fail-safe position, by means of the spring.

Der Erfindung liegt daher die Aufgabe zugrunde, ein System zur Regelung des Drucks an einem Überdruckbehälter mit Inertgasatmosphäre bereitzustellen, das gegenüber dem Stand der Technik vereinfacht ist und das insbesondere die Sicherheitsanforderungen bezüglich Störanfälligkeit erfüllt.The invention is therefore based on the object of providing a system for regulating the pressure in an overpressure container with an inert gas atmosphere, which is simplified compared to the prior art and which in particular meets the safety requirements with regard to susceptibility to failure.

Darüber hinaus soll das System ausfallsicher besonders einfach regelbar sein, um in dem Überdruckbehälter den Überdruck in entsprechenden Grenzen einstellen zu können.In addition, the system should be particularly easy to regulate in a fail-safe manner in order to be able to set the overpressure in the overpressure container within appropriate limits.

Die Aufgabe wird gelöst mit einem System gemäß, Anspruch 1 und mit der Verwendung eines solchen Systems gemäß Anspruch 9. Vorteilhafte Ausgestaltungen des Systems ergeben sich aus den Unteransprüchen. Ein Gesichtspunkt der Erfindung betrifft ein System zur Regelung des Drucks an einem Überdruckbehälter mit Inertgasatmosphäre, umfassend einThe object is achieved with a system according to claim 1 and with the use of such a system according to claim 9. Advantageous refinements of the system result from the subclaims. One aspect of the invention relates to a system for regulating the pressure on an overpressure container with an inert gas atmosphere, comprising a

Behälterdruckregelventil, eine Steuereinrichtung zur Steuerung des Behälterdruckregelventils, wobei das Behälterdruckregelventil bei Unterdruck innerhalb des Behälters selbsttätig schließend ausgebildet ist, eine von der Steuereinrichtung ansteuerbare Stelleinrichtung zur Betätigung des Behälterdruckregelventils gegen eine Schließkraft, die das selbsttätige Schließen des Behälterdruckregelventils bewirkt, wobei die Stelleinrichtung pneumatisch betätigbar ist, eine an die Stelleinrichtung angeschlossene Betriebsdruckversorgungsleitung, ein Betätigungsdruckregelventil zur Betätigung der Stelleinrichtung sowie Mittel zur Druckentlastung der Stelleinrichtung bei Ausfall einer elektrischen Versorgungsspannung der Steuereinrichtung.Container pressure regulating valve, a control device for controlling the container pressure regulating valve, wherein the container pressure regulating valve is designed to close automatically when there is negative pressure inside the container, an actuating device controllable by the control device for actuating the container pressure regulating valve against a closing force that causes the container pressure regulating valve to automatically close, the actuating device being pneumatically actuated , an operating pressure supply line connected to the actuating device, an actuating pressure control valve for actuating the actuating device and means for pressure relief of the actuating device in the event of failure of an electrical supply voltage of the control device.

Eine solche Konfiguration des Systems zur Regelung des Drucks an einem Überdruckbehälter erlaubt es, sowohl das sichere Öffnen des Behälterdruckregelventils bei Druckanstieg als auch das sichere Schließen des Behälterdruckregelventils zu bewirken, wobei das System gemäß der Erfindung insbesondere den Vorzug hat, dass nur ein einziges Behälterdruckregelventil erforderlich ist.Such a configuration of the system for regulating the pressure in an overpressure container allows both the safe opening of the container pressure control valve when the pressure rises and the safe closing of the container pressure control valve, the system according to the invention having the particular advantage that only a single container pressure control valve is required is.

Dieses Behälterdruckregelventil kann als verhältnismäßig große "Druckregelklappe" ausgebildet sein, die beispielsweise mittels einer Feder in der Schließrichtung vorgespannt ist.This container pressure regulating valve can be designed as a relatively large "pressure regulating flap" which is pretensioned in the closing direction by means of a spring, for example.

Die Stelleinrichtung kann beispielsweise über ein Druckluftnetz mit einer Druckluftquelle mit Druckluft beaufschlagt werden.The actuating device can be acted upon with compressed air, for example via a compressed air network with a compressed air source.

Hierzu ist die Stelleinrichtung an eine Betriebsdruckversorgungsleitung des Druckluftnetzes angeschlossen.For this purpose, the actuating device is connected to an operating pressure supply line of the compressed air network.

Als Mittel zur Druckentlastung der Stelleinrichtung kann beispielsweise ein elektrisch steuerbares Entlüftungsventil vorgesehen sein, welches in ersten Schaltstellung stromlos offen ist und in der geöffneten ersten Schaltstellung eine pneumatische Entlastung der Stelleinrichtung bewirkt, so dass bei Stromausfall die Stelleinrichtung unmittelbar drucklos geschaltet wird und sich das Behälterdruckregelventil selbsttätig in die geschlossene Stellung bewegt.An electrically controllable vent valve, for example, can be provided as a means for pressure relief of the actuating device, which is normally open in the first switching position and in the open first switching position causes a pneumatic relief of the actuating device so that in the event of a power failure the actuating device is immediately depressurized and the container pressure control valve is automatically activated moved to the closed position.

Erfindungsgemäß ist vorgesehen, dass das Entlüftungsventil in einer pneumatischen Steuerleitung des Betätigungsdruckregelventils angeordnet ist, wobei das Entlüftungsventil in einer zweiten Schaltstellung eine Belastung der Steuerleitung mit einem Steuerdruck bewirkt.According to the invention, it is provided that the vent valve is arranged in a pneumatic control line of the actuating pressure regulating valve, the vent valve in a second switching position causing the control line to be loaded with a control pressure.

Erfindungsgemäß ist vorgesehen, die Entlüftung des Betätigungsdruckregelventils über die Steuerleitung des Betätigungsdruckregelventils vorzunehmen.According to the invention it is provided that the actuating pressure regulating valve is vented via the control line of the actuating pressure regulating valve.

Bei einer bevorzugten Variante des Systems gemäß der Erfindung kann vorgesehen sein, dass das Betätigungsdruckregelventil über ein Pilotventil ansteuerbar ist. Das Pilotventil wirkt zweckmäßigerweise auf einen Steuereingang des Betätigungsdruckregelventils ein.In a preferred variant of the system according to the invention, it can be provided that the actuating pressure regulating valve can be controlled via a pilot valve. The pilot valve expediently acts on a control input of the actuating pressure regulating valve.

Besonders zweckmäßig ist es, wenn das Pilotventil und das Entlüftungssystem in der pneumatischen Steuerleitung in Reihe geschaltet sind.It is particularly useful if the pilot valve and the venting system are connected in series in the pneumatic control line.

In einer zweiten Schaltstellung des Entlüftungsventils ist vorgesehen, dass das Pilotventil das Betätigungsdruckregelventil ansteuern kann, beziehungsweise den auf den Steuereingang des Betätigungsdruckregelventils einwirkenden Steuerdruck durchschaltet.In a second switching position of the vent valve, it is provided that the pilot valve can control the actuating pressure regulating valve or switch through the control pressure acting on the control input of the actuating pressure regulating valve.

Die pneumatische Steuerleitung und die Betriebsdruckversorgungsleitung können beispielsweise parallel geschaltet sein, wobei das Betätigungsdruckregelventil je nach Ansteuerung eine Betätigung der pneumatischen Stelleinrichtung gegen die Schließkraft bewirkt.The pneumatic control line and the operating pressure supply line can, for example, be connected in parallel, the actuating pressure regulating valve actuating the pneumatic actuating device against the closing force depending on the control.

Besonders zweckmäßig ist es, wenn das Betätigungsdruckregelventil als Druckverstärker ausgebildet ist.It is particularly useful if the actuating pressure control valve is designed as a pressure booster.

Vorzugsweise ist die Steuereinrichtung, die den Steuerdruck für das Betätigungsdruckregelventil vorgibt, in der pneumatischen Steuerleitung des Betätigungsdruckregelventils angeordnet, wobei das Pilotventil in einer ersten Schaltstellung die Steuereinrichtung überbrückt und wobei vorzugsweise in einer zweiten betätigten Schaltstellung über die Steuereinrichtung der von dieser vorgegebene Steuerdruck an einem Ausgang des Pilotventils anliegt. Befindet sich das Entlüftungsventil ebenfalls in der zweiten betätigten Schaltstellung, so liegt der Steuerdruck an dem Betätigungsdruckregelventil beziehungsweise an dessen Steuereingang an.The control device, which specifies the control pressure for the actuating pressure regulating valve, is preferably arranged in the pneumatic control line of the actuating pressure regulating valve, the pilot valve in a first Switching position bridged by the control device and wherein, preferably in a second actuated switching position, the control pressure predetermined by the control device is applied to an output of the pilot valve. If the vent valve is also in the second actuated switching position, the control pressure is applied to the actuating pressure regulating valve or to its control input.

Zweckmäßigerweise ist das Entlüftungsventil als Magnetventil ausgebildet, das im bestromtem Zustand die pneumatische Steuerleitung mit dem Betätigungsdruckregelventil verbindet und das in stromlosem Zustand einen Entlüftungspfad freigibt, so dass die Stelleinrichtung pneumatisch entlastet ist. Bei Stromausfall kann auf diese Art und Weise sicher gestellt werden, dass die Stelleinrichtung entlastet wird, so dass jedenfalls eine Aufrechterhaltung der Inertgasatmosphäre innerhalb des Überdruckbehälters gewährleistet ist.The vent valve is expediently designed as a solenoid valve which, when energized, connects the pneumatic control line to the actuating pressure regulating valve and which, when de-energized, releases a vent path so that the actuating device is pneumatically relieved. In the event of a power failure, it can be ensured in this way that the load on the actuating device is relieved, so that maintenance of the inert gas atmosphere within the overpressure container is guaranteed in any case.

Das Pilotventil kann ebenfalls als Magnetventil ausgebildet sein, das stromlos die pneumatische Steuerleitung mit dem Betätigungsdruckregelventil verbindet. Da das Pilotventil und das Entlüftungsventil in Reihe geschaltet sind, bewirkt ein Stromausfall, dass das Entlüftungsventil die pneumatische Steuerleitung verschließt und einen Entlüftungspfad des Betätigungsdruckregelventils öffnet.The pilot valve can also be designed as a solenoid valve, which connects the pneumatic control line to the actuating pressure regulating valve without current. Since the pilot valve and the vent valve are connected in series, a power failure causes the vent valve to close the pneumatic control line and open a vent path of the actuating pressure control valve.

Bei einer weiteren vorteilhaften Ausgestaltung des Systems gemäß der Erfindung ist vorgesehen, dass dieses wenigstens einen Druckluftzwischenspeicher zwischen einer Druckluftquelle und der Betriebsdruckversorgungsleitung umfasst, so dass sichergestellt ist, dass auch bei Nichtverfügbarkeit des Druckluftnetzes eine sichere Betätigung des Behälterdruckregelventils möglich ist.In a further advantageous embodiment of the system according to the invention, it is provided that it comprises at least one compressed air buffer between a compressed air source and the operating pressure supply line, so that it is ensured that reliable actuation of the container pressure regulating valve is possible even if the compressed air network is not available.

Vorzugsweise ist als Überdruckbehälter ein Wirbelschichttrockner für Kohle, insbesondere für Braunkohle oder ein Röhrentrockner für Kohle, insbesondere für Braunkohle vorgesehen.A fluidized bed dryer for coal, in particular for lignite, or a tube dryer for coal, in particular for lignite, is preferably provided as the pressurized container.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert. Die Zeichnung zeigt eine schematische Darstellung des Behälterdruckregelventils innerhalb eines pneumatischen Schaltbildes.The invention is explained below using an exemplary embodiment shown in the drawing. The drawing shows a schematic Representation of the tank pressure control valve within a pneumatic circuit diagram.

Der Überdruckbehälter ist in dem Schaltbild nicht dargestellt.The overpressure tank is not shown in the circuit diagram.

Das Behälterdruckregelventil 1 umfasst einen Ventilkörper 2, der über ein Schließgestänge 3 und über eine auf das Schließgestänge 3 einwirkende Druckfeder 4 im Ventilsitz gehalten wird. Das Schließgestänge 3 ist entgegen der Federkraft und Druckfeder 4 über eine pneumatische Stelleinrichtung 5 betätigbar. Die pneumatische Stelleinrichtung 5 ist mit einem Betätigungsdruckregelventil 6 in Wirkverbindung, wobei das Betätigungsdruckregelventil 6 als Druckverstärker ausgebildet ist. Das Betätigungsdruckregelventil 6 ist über eine Betriebsdruckversorgungsleitung 7 an ein Druckluftnetz 8 angeschlossen.The container pressure regulating valve 1 comprises a valve body 2 which is held in the valve seat via a closing rod 3 and via a compression spring 4 acting on the closing rod 3. The closing rod 3 can be actuated against the spring force and compression spring 4 via a pneumatic actuating device 5. The pneumatic control device 5 is in operative connection with an actuation pressure control valve 6, the actuation pressure control valve 6 being designed as a pressure booster. The actuating pressure regulating valve 6 is connected to a compressed air network 8 via an operating pressure supply line 7.

Das Betätigungsdruckregelventil 6 umfasst weiterhin einen Steuereingang, an den eine pneumatische Steuerleitung 9 angeschlossen ist. Die pneumatische Steuerleitung 9 ist pneumatisch parallel zu der Betriebsdruckversorgungsleitung 7 verlegt, wobei in der pneumatischen Steuerleitung 9 ein Pilotventil 10 und ein Entlüftungsventil 11 in Reihe angeordnet sind. Der Druck in der pneumatischen Steuerleitung wird über eine Steuereinrichtung 12, die als Druckregeleinheit ausgebildet ist, vorgegeben. Die Steuereinrichtung 12 ist parallel zu einer Abzweigung 13 der Betriebsdruckversorgungsleitung 7 geschaltet.The actuating pressure regulating valve 6 furthermore comprises a control input to which a pneumatic control line 9 is connected. The pneumatic control line 9 is pneumatically laid parallel to the operating pressure supply line 7, a pilot valve 10 and a vent valve 11 being arranged in series in the pneumatic control line 9. The pressure in the pneumatic control line is specified via a control device 12, which is designed as a pressure control unit. The control device 12 is connected in parallel to a branch 13 of the operating pressure supply line 7.

Das Schaltbild zeigt das Pilotventil 10 stromlos offen, wohingegen das Entlüftungsventil 11 ebenfalls in der stromlosen Stellung gezeigt ist, diese Stellung ist die Entlüftungsstellung des Entlüftungsventils 11, in welcher das Betätigungsdruckregelventil 6 entlüftet wird. In dieser Schaltstellung wird die Stelleinrichtung 5 nicht betätigt beziehungsweise ist die Stelleinrichtung 5 entlastet.The circuit diagram shows the pilot valve 10 normally open, whereas the vent valve 11 is also shown in the de-energized position; this position is the vent position of the vent valve 11 in which the actuating pressure control valve 6 is vented. In this switching position the actuating device 5 is not actuated or the actuating device 5 is relieved.

Das Pilotventil 10 ist als drei/zwei-Wegeventil ausgebildet, ebenso wie das Entlüftungsventil 11 als drei/zwei-Wegeventil ausgebildet ist.The pilot valve 10 is designed as a three / two-way valve, just like the vent valve 11 is designed as a three / two-way valve.

Bei bestromtem Zustand des Pilotventils 10 liegt der von der Steuereinrichtung 12 vorgegebene Steuerdruck an einem Ausgang des Pilotventils 10 auf der pneumatischen Steuerleitung 9 an. Befindet sich das Entlüftungsventils 11 ebenfalls in der zweiten Schaltstellung (nicht dargestellter bestromter Zustand) liegt der Steuerdruck der pneumatischen Steuerleitung 9 an einem nicht näher bezeichneten Steuereingang des Betätigungsdruckregelventils 6 an. Der von dem Betätigungsdruckregelventil 6 abgegebene verstärkte Steuerimpuls, der auf die pneumatische Stelleinrichtung 5 einwirkt, ist proportional zu dem Differenzdruck zwischen der pneumatischen Steuerleitung 9 und der Betriebsdruckversorgungsleitung 7. In diesem Fall (Regelbetrieb) erfolgt eine maximale Druckverstärkung über das Betätigungsdruckregelventil 6, wenn der Differenzdruck zwischen der pneumatischen Steuerleitung 9 und Betriebsdruckversorgungsleitung 7 null ist. Über die Steuereinrichtung 12 lässt sich somit die Stellung des Behälterdruckregelventils 1 gegen die Schließkraft der Druckfeder 4 zwischen 0 % (geschlossen) und 100 % (volle Öffnung) regeln. Mit der beschriebenen Verschaltung lassen sich insgesamt drei Betriebsfälle realisieren. Bei Stromausfall (Fall I) befindet sich das Entlüftungsventil 11 in der gezeigten Stellung, in der eine Entlüftung des Betätigungsdruckregelventils 6 über die pneumatische Steuerleitung 9 erfolgt, wodurch ein selbsttätiges Schließen des Behälters über die Druckfeder 4 erfolgt.When the pilot valve 10 is energized, the control pressure specified by the control device 12 is present at an output of the pilot valve 10 on the pneumatic control line 9. If the vent valve 11 is also in the second switching position (energized state, not shown), the control pressure of the pneumatic control line 9 is applied to a control input of the actuating pressure regulating valve 6 (not shown). The amplified control pulse emitted by the actuating pressure regulating valve 6, which acts on the pneumatic actuating device 5, is proportional to the differential pressure between the pneumatic control line 9 and the operating pressure supply line 7. In this case (control operation), a maximum pressure boosting takes place via the actuating pressure regulating valve 6 when the differential pressure between the pneumatic control line 9 and the operating pressure supply line 7 is zero. The position of the container pressure regulating valve 1 against the closing force of the compression spring 4 can thus be regulated between 0% (closed) and 100% (full opening) via the control device 12. A total of three operating cases can be implemented with the interconnection described. In the event of a power failure (case I), the vent valve 11 is in the position shown, in which venting of the actuating pressure control valve 6 takes place via the pneumatic control line 9, as a result of which the container closes automatically via the compression spring 4.

Im Regelbetrieb (Fall II) ist das Pilotventil 10 angesteuert und befindet sich in der zweiten nicht gezeigten Schaltstellung. Das Entlüftungsventil 11 ist ebenfalls bestromt und angesteuert und befindet sich ebenfalls in der zweiten, nicht dargestellten Schaltstellung. Über die Steuereinrichtung 12 wird der Steuerdruck in der pneumatischen Steuerleitung 9 vorgegeben. Der Steuerdruck der pneumatischen Steuerleitung 9 liegt sowohl an einem Eingang des Pilotventils 10 als auch an dem Ausgang des Pilotventils 10 an. Weiterhin liegt der Steuerdruck an einem Eingang des Entlüftungsventils 11 und an dem Ausgang des Entlüftungsventils 11 an. Der Differenzdruck zwischen der pneumatischen Steuerleitung 9 und der Betriebsdruckversorgungsleitung 7 gibt die Schaltstellung der pneumatischen Stelleinrichtung 5 vor.In normal operation (case II) the pilot valve 10 is activated and is in the second switching position, not shown. The vent valve 11 is also energized and activated and is also in the second switching position, not shown. The control pressure in the pneumatic control line 9 is specified via the control device 12. The control pressure of the pneumatic control line 9 is applied both to an input of the pilot valve 10 and to the output of the pilot valve 10. Furthermore, the control pressure is applied to an input of the vent valve 11 and to the output of the vent valve 11. The differential pressure between the pneumatic control line 9 and the operating pressure supply line 7 specifies the switching position of the pneumatic actuating device 5.

Ein weiterer Fall (Fall III) beschreibt das schnellstmögliche Öffnen des Behälters im Überdruckfall. In diesem Fall wird beispielsweise über einen Drucksensor in dem Überdruckbehälter das Pilotventil 10 stromlos geschaltet, das heißt in die erste, gezeigte Schaltstellung bewegt, in der die Steuereinrichtung 12 überbrückt ist. Am Eingang des Pilotventils 10 liegt der volle Betriebsdruck an, der in der Abzweigung 13 der Betriebsdruckversorgungsleitung 7 vorherrscht. Dieser volle Betriebsdruck liegt auch an dem Eingang des Entlüftungsventils 11 an. Das Entlüftungsventil 11 bleibt bestromt und befindet sich in diesem Fall in der zweiten Schaltstellung, so dass der volle Betriebsdruck auch an dem Steuereingang des Betätigungsdruckregelventils anliegt. Damit erfolgt die volle Druckverstärkung über das Betätigungsdruckregelventil, so dass die pneumatische Stelleinrichtung 5 den Ventilkörper 2 gegen die Schließkraft der Druckfeder 4 schnellstmöglichst in die voll geöffnete Stellung verfährt. Dieser Fall beschreibt ein Notöffnen bei plötzlichem Überdruck innerhalb des Überdruckbehälters.Another case (case III) describes the quickest possible opening of the container in the event of overpressure. In this case, the pilot valve 10 is de-energized, for example via a pressure sensor in the overpressure container, that is to say moved into the first switching position shown, in which the control device 12 is bypassed. The full operating pressure that prevails in the branch 13 of the operating pressure supply line 7 is present at the inlet of the pilot valve 10. This full operating pressure is also applied to the inlet of the vent valve 11. The vent valve 11 remains energized and in this case is in the second switching position, so that the full operating pressure is also applied to the control input of the actuating pressure regulating valve. The full pressure amplification thus takes place via the actuating pressure regulating valve, so that the pneumatic adjusting device 5 moves the valve body 2 into the fully open position as quickly as possible against the closing force of the compression spring 4. This case describes an emergency opening in the event of sudden overpressure within the overpressure container.

Bei der gezeigten Verschaltung der pneumatischen Steuerleitung 9 und der Betriebsdruckversorgungsleitung 7 kann beispielsweise in der Betriebsdruckversorgungsleitung 7 sowohl als auch in der pneumatischen Steuerleitung 9 ein Betriebsdruck von 6 bar anlegen. Dieser Druck wird zur Betätigung des Behälterdruckregelventils 1 gegen die Schließkraft der Druckfeder 4 mittels des Betätigungsdruckregelventils 6 verstärkt. Bei Stromausfall würden das Pilotventil 10 sowohl als auch das Entlüftungsventil 11 die in dem Schaltbild dargestellte Stellung einnehmen, in welcher das Betätigungsdruckregelventil 6 druckentlastet beziehungsweise entlüftet wird und wobei die Stelleinrichtung 5 dann drucklos ist, was ein Schließen des Betätigungsdruckregelventils 6 mittels der Druckfeder 4 bewirkt.In the shown interconnection of the pneumatic control line 9 and the operating pressure supply line 7, an operating pressure of 6 bar can be applied in the operating pressure supply line 7 as well as in the pneumatic control line 9. This pressure is increased by means of the actuating pressure regulating valve 6 to actuate the container pressure regulating valve 1 against the closing force of the compression spring 4. In the event of a power failure, both the pilot valve 10 and the vent valve 11 would assume the position shown in the circuit diagram, in which the actuating pressure regulating valve 6 is depressurized or vented and the actuating device 5 is then depressurized, which causes the actuating pressure regulating valve 6 to close by means of the compression spring 4.

BezugszeichenlisteList of reference symbols

11
BehälterdruckregelventilTank pressure control valve
22
VentilkörperValve body
33
SchließgestängeLocking linkage
44th
DruckfederCompression spring
55
pneumatische Stelleinrichtungpneumatic control device
66th
BetätigungsdruckregelventilActuating pressure control valve
77th
BetriebsdruckversorgungsleitungOperating pressure supply line
88th
DruckluftnetzCompressed air network
99
pneumatische Steuerleitungpneumatic control line
1010
PilotventilPilot valve
1111
EntlüftungsventilVent valve
1212
SteuereinrichtungControl device
1313
AbzweigungJunction

Claims (9)

  1. A system for regulating the pressure on an overpressure container with an inert gas atmosphere, comprising a container pressure regulating valve (1), a control device (12) for controlling the container pressure regulating valve (1), the container pressure regulating valve (1) being designed to close automatically when there is negative pressure inside the container; an adjusting device (5) that is controllable by the control device (12) for actuating the container pressure regulating valve (1) against a closing force that causes the automatic closing of the container pressure regulating valve (1), the adjusting device (5) being pneumatically actuated; an operating pressure supply line (7) that is connected to the adjusting device (5); an actuating pressure regulating valve (6) for actuating the actuating device (5) as well as means for relieving pressure of the actuating device (5) in the event of an electrical supply voltage failure of the control device (12), an electrically controllable vent valve (11) being provided as a means for relieving pressure of the actuating device (5) that is normally open in a first switching position and, when in the open position, brings about a pneumatic relieving of the actuating device (5), characterized in that the vent valve (11) is on a pneumatic control line (9) of the actuating pressure control valve (6), and in that the vent valve (11), when in a second switching position, causes the control line (9) to be loaded with a control pressure that is applied to a control input of the actuating pressure regulating valve (6).
  2. The system according to claim 1, characterized in that the actuating pressure regulating valve (6) is controllable via a pilot valve (10).
  3. The system according to claim 2, characterized in that the pilot valve (10) and the vent valve (11) are connected in series on the pneumatic control line (9).
  4. The system according to any of claims 1 to 3, characterized in that the actuating pressure regulating valve (6) is embodied as a pressure booster.
  5. The system according to any of claims 1 to 4, characterized in that the control device (12) is arranged on the pneumatic control line (9) of the actuating pressure regulating valve (6), and in that the pilot valve (10) bridges the control device (12) in a first switching position.
  6. The system according to any of claims 1 to 5, characterized in that the vent valve (11) is embodied as a solenoid valve which, when energized, connects the pneumatic control line (9) to the actuating pressure regulating valve (6) and which, when de-energized, opens a vent path, so that the actuating device (5) is pneumatically relieved.
  7. The system according to any of claims 2 to 6, characterized in that the pilot valve (10) is embodied as a solenoid valve which, when de-energized, connects the pneumatic control line (9) to the actuating pressure regulating valve (6) while bridging the control device (12).
  8. The system according to any of claims 1 to 7, characterized in that at least one intermediate compressed air reservoir is provided that is arranged between a compressed air source and the operating pressure supply line (7).
  9. A use of a system according to any of claims 1 to 8, comprising an overpressure container, wherein a fluidized-bed dryer for coal, preferably for brown coal, or a tube dryer for coal, preferably for brown coal, is provided as the overpressure container.
EP16720730.7A 2015-04-20 2016-04-14 System for pressure regulation at a pressurized inert gas container Active EP3286438B1 (en)

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Applications Claiming Priority (2)

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DE102015207121.9A DE102015207121A1 (en) 2015-04-20 2015-04-20 System for regulating the pressure at a pressure vessel with an inert gas atmosphere
PCT/EP2016/058211 WO2016169832A1 (en) 2015-04-20 2016-04-14 System for controlling the pressure of an overpressure container having an inert gas atmosphere

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Publication number Priority date Publication date Assignee Title
DE4123147C2 (en) * 1991-07-12 1995-04-20 Welland & Tuxhorn Armaturen U Actuating device for a pneumatic control valve
DE9310932U1 (en) * 1993-07-21 1993-09-30 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München Electro-hydraulic control device
JP3476022B2 (en) * 1993-10-15 2003-12-10 横河電機株式会社 Electric / pneumatic converter
DE4429401C2 (en) * 1994-08-09 1999-01-07 Hartmann & Braun Gmbh & Co Kg Hydraulic actuator
DE19512015C2 (en) * 1995-03-31 1998-07-30 Rheinische Braunkohlenw Ag Process for cooling drying systems and system for drying water-containing bulk material
US6035878A (en) * 1997-09-22 2000-03-14 Fisher Controls International, Inc. Diagnostic device and method for pressure regulator
US6357335B1 (en) * 1999-12-23 2002-03-19 Sox Corporation Pneumatic volume booster for valve positioner
US7314059B2 (en) * 2004-09-17 2008-01-01 Active Power, Inc. Systems and methods for controlling pressure of fluids
DE102008028189B4 (en) * 2008-06-12 2014-05-22 Abb Technology Ag Electropneumatic valve
DE102010056277B4 (en) * 2010-12-24 2014-04-17 Abb Technology Ag Shut-off
DE102011007629B3 (en) * 2011-04-18 2012-09-27 Siemens Aktiengesellschaft Electropneumatic positioner

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PL3286438T3 (en) 2021-05-17
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EP3286438A1 (en) 2018-02-28

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