EP1797338B1 - Zweistufiges servoventil - Google Patents

Zweistufiges servoventil Download PDF

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Publication number
EP1797338B1
EP1797338B1 EP20050797287 EP05797287A EP1797338B1 EP 1797338 B1 EP1797338 B1 EP 1797338B1 EP 20050797287 EP20050797287 EP 20050797287 EP 05797287 A EP05797287 A EP 05797287A EP 1797338 B1 EP1797338 B1 EP 1797338B1
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EP
European Patent Office
Prior art keywords
valve
stage
bridge circuit
switching points
way valve
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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.)
Not-in-force
Application number
EP20050797287
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English (en)
French (fr)
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EP1797338A1 (de
Inventor
Andre-Heinrich Meinhof
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Siemens AG
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Siemens AG
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Publication of EP1797338B1 publication Critical patent/EP1797338B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • 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
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • 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
    • F15B2211/30—Directional control
    • F15B2211/355—Pilot pressure control
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential 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
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control 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
    • F15B2211/526—Pressure control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/575—Pilot pressure control
    • 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
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
    • F15B2211/8633—Pressure source supply failure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y10T137/8659—Variable orifice-type modulator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86582—Pilot-actuated
    • Y10T137/86614—Electric

Definitions

  • the invention relates to a two-stage servo valve with a first stage in which four flow resistors, of which at least one flow resistance is variable, are arranged in a bridge circuit, wherein two opposite points of the bridge circuit are connected to supply air and exhaust air and between the two other circuit points a variable in magnitude and sign ready pressure difference, and with a second stage in which a pressure-actuated by the control piston is arranged, which controls a three-way valve.
  • Such, from the DE 41 35 822 A1 known servo valve includes in a first stage up to four individual piezo valves, all four, or in lesser numbers together with fixed resistors, are arranged in a bridge circuit.
  • Each piezo valve contains its own controllable piezoelectric element, which forms a controllable flow resistance together with a baffle plate.
  • the bridge circuit is used to generate a variable in magnitude and sign pressure difference, with a control piston in a further stage of the servo valve and a three-way valve can be adjusted via this, which in turn is used to adjust a hydraulic cylinder.
  • the DE 42 01 442 A1 shows an alternative embodiment of the three-way valve, which may be constructed in a known manner as a slide valve, rotary valve or individual valves, for example, flap valves, consisting.
  • Servo valves are used in many areas of technology, including electropneumatic positioners, which are used to control the operation of process valves. When the electrical energy fails, it is often required that the drive controlled by the positioner automatically bring the process valve into a safe position, usually "open” or "close”.
  • the invention has for its object to enable the simplest means in case of failure of the electrical energy holding the current position of the controlled by the servo valve process valve.
  • the object is achieved in that in the servo valve of the type specified, the pressure difference providing points are connected to each other via a solenoid valve which is closed in the controlled state and is open when not driven state and thereby connects the circuit points pneumatically.
  • the solenoid valve opens and thus closes the output of the bridge circuit or the two hydraulic sides of the control piston pneumatically short.
  • the three-way valve assumes the middle position (rest position), which allows holding the process valve drive connected thereto in the current position.
  • the two-stage servo valve 1 contains in a first stage 2 four flow resistances 3, 4, 5, 6, which are arranged in a bridge circuit 7.
  • the flow resistances 5 and 6 are designed as piezo valves and can be changed in opposite directions by an electrical control voltage dU.
  • the bridge circuit 7 is connected to supply air Pz or exhaust air E.
  • the two other circuit points 10 and 11 is a variable in size and sign pressure difference available. With this pressure difference arranged in a second stage 12 of the servo valve 1 control piston 13 is displaceable, which controls a between the supply and exhaust air Pz, E and the drive 14 of a process valve 15 lying three-way valve 16.
  • the drive 14 is connected either to the supply air Pz or the exhaust air E and thus adjusts the process valve 15 in the direction "close” or "open".
  • the drive 14 is separated from the supply and exhaust air Pz, E and remains in the respective current position.
  • a solenoid valve 17 is arranged between the circuit points 10 and 11 of the bridge circuit 7, of the Operating voltage U B is controlled and is closed. In case of failure of the operating voltage U B opens the solenoid valve 17 and closes the circuit points 10 and 11 pneumatically short. As a result, the three-way valve 16 assumes its center position.
  • the piezo valves 5, 6 and the three-way valve 16 may be formed in different ways, as can be seen for example in the introduction mentioned in the publications.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Servomotors (AREA)
  • Fluid-Driven Valves (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Magnetically Actuated Valves (AREA)

Description

  • Die Erfindung betrifft ein zweistufiges Servoventil mit einer ersten Stufe, in der vier Strömungswiderstände, von denen mindestens ein Strömungswiderstand veränderlich ist, in einer Brückenschaltung angeordnet sind, wobei zwei gegenüberliegende Schaltungspunkte der Brückenschaltung mit Zuluft bzw. Abluft verbunden sind und zwischen den beiden anderen Schaltungspunkten eine in Größe und Vorzeichen veränderliche Druckdifferenz bereitsteht, und mit einer zweiten Stufe, in der ein von der Druckdifferenz betätigbarer Steuerkolben angeordnet ist, der ein Dreiwegeventil steuert.
  • Ein derartiges, aus der DE 41 35 822 A1 bekanntes Servoventil enthält in einer ersten Stufe bis zu vier einzelne Piezoventile, die alle vier, oder bei geringerer Anzahl zusammen mit Festwiderständen, in einer Brückenschaltung angeordnet sind. Jedes Piezoventil enthält ein eigenes ansteuerbares Piezoelement, das zusammen mit einer Prallplatte einen steuerbaren Strömungswiderstand bildet. Die Brückenschaltung dient zur Erzeugung einer in Größe und Vorzeichen veränderlichen Druckdifferenz, mit der in einer weiteren Stufe des Servoventils ein Steuerkolben und über diesen ein Dreiwegeventil verstellt werden kann, welches seinerseits zur Verstellung eines Hydraulikzylinders dient.
  • Alternativen zur Ausbildung der Piezoventile sind aus der EP 0 943 812 A1 bekannt oder Gegenstand der älteren deutschen Patentanmeldung mit dem amtlichen Aktenzeichen 10 2004 035 844.3 .
  • Anstelle der Piezoventile können in der Brückenschaltung auch elektromagnetisch oder auf sonstige Weise elektrisch betätigbare Ventile zum Einsatz kommen.
  • Die DE 42 01 442 A1 zeigt eine alternative Ausführungsform für das Dreiwegeventil, das in bekannter Weise auch als Schiebeventil, Drehventil oder aus Einzelventilen, zum Beispiel Klappenventilen, bestehend aufgebaut sein kann.
  • Servoventile kommen in vielen Bereichen der Technik, so auch bei elektropneumatischen Stellungsreglern zum Einsatz, welche zur Steuerung des Antriebs von Prozessventilen dienen. Bei Ausfall der elektrischen Energie wird oft gefordert, dass der von dem Stellungsregler angesteuerte Antrieb das Prozessventil automatisch in eine sichere Position, in der Regel "Öffnen" oder "Schließen" bringt.
  • Der Erfindung liegt die Aufgabe zugrunde, mit einfachsten Mitteln bei Ausfall der elektrischen Energie das Halten der aktuellen Position des von dem Servoventil angesteuerten Prozessventils zu ermöglichen.
  • Gemäß der Erfindung wird die Aufgabe dadurch gelöst, dass bei dem Servoventil der eingangs angegebenen Art die die Druckdifferenz bereitstellenden Schaltungspunkte über ein Magnetventil miteinander verbunden sind, das im angesteuerten Zustand geschlossen ist und bei nicht angesteuertem Zustand geöffnet ist und dabei die Schaltungspunkte pneumatisch miteinander verbindet.
  • Bei Ausfall der elektrischen Energie öffnet das Magnetventil und schließt so den Ausgang der Brückenschaltung bzw. die beiden Hydraulikseiten des Steuerkolbens pneumatisch kurz. Als Folge davon nimmt das Dreiwegeventil die Mittelstellung (Ruhestellung) ein, die ein Halten des daran anschließbaren Prozessventilantriebs in der aktuellen Position ermöglicht. Im Weiteren wird das erfindungsgemäße Servoventil anhand eines in der einzigen Figur der Zeichnung dargestellten Ausführungsbeispiels erläutert.
  • Das zweistufige Servoventil 1 enthält in einer ersten Stufe 2 vier Strömungswiderstände 3, 4, 5, 6, die in einer Brückenschaltung 7 angeordnet sind. Die Strömungswiderstände 5 und 6 sind als Piezoventile ausgebildet und durch eine elektrische Steuerspannung dU gegensinnig veränderbar. An zwei gegenüberliegenden Schaltungspunkten 8, 9 ist die Brückenschaltung 7 mit Zuluft Pz bzw. Abluft E verbunden. An den beiden anderen Schaltungspunkten 10 und 11 steht eine in Größe und Vorzeichen veränderliche Druckdifferenz zur Verfügung. Mit dieser Druckdifferenz ist ein in einer zweiten Stufe 12 des Servoventils 1 angeordneter Steuerkolben 13 verschiebbar, der ein zwischen der Zu- und Abluft Pz, E und dem Antrieb 14 eines Prozessventils 15 liegendes Dreiwegeventil 16 steuert. In den beiden Endstellungen des Dreiwegeventils 16 wird der Antrieb 14 entweder mit der Zuluft Pz oder der Abluft E verbunden und verstellt somit das Prozessventil 15 in Richtung "Schließen" oder "Öffnen". In der Mittelstellung (Ruhestellung) des Dreiwegeventils 16 ist der Antrieb 14 von der Zu- bzw. Abluft Pz, E getrennt und verbleibt in der jeweils aktuellen Position.
  • Um zu erreichen, dass bei Ausfall der elektrischen Energieversorgung das Dreiwegeventil 16 die Mittelstellung einnimmt und so den Antrieb 14 bzw. das Prozessventil 15 in der aktuellen Position hält, ist zwischen den Schaltungspunkten 10 und 11 der Brückenschaltung 7 ein Magnetventil 17 angeordnet, das von der Betriebsspannung UB angesteuert wird und dabei geschlossen ist. Bei Ausfall der Betriebsspannung UB öffnet das Magnetventil 17 und schließt dabei die Schaltungspunkte 10 und 11 pneumatisch kurz. In der Folge nimmt das Dreiwegeventil 16 seine Mittelstellung ein. Die Piezoventile 5, 6 und das Dreiwegeventil 16 können in unterschiedlicher Weise ausgebildet sein, so wie dies zum Beispiel den in der Beschreibungseinleitung genannten Druckschriften zu entnehmen ist.

Claims (1)

  1. Zweistufiges Servoventil (1) mit einer ersten Stufe (2), in der vier Strömungswiderstände (3, 4, 5, 6), von denen mindestens ein Strömungswiderstand (5, 6) veränderlich ist, in einer Brückenschaltung (7) angeordnet sind, wobei zwei gegenüberliegende Schaltungspunkte (8, 9) der Brückenschaltung (7) mit Zuluft (Pz) bzw. Abluft (E) verbunden sind und zwischen den beiden anderen Schaltungspunkten (10, 11) eine in Größe und Vorzeichen veränderliche Druckdifferenz bereitsteht, und mit einer zweiten Stufe (12), dadurch gekennzeichnet dass in der zweiten Stufe ein Dreiwegeventil (16) und ein von der Druckdifferenz betätigbarer Steuerkolben (13) angeordnet ist, der das Dreiwegeventil (16) steuert, und dass die die Druckdifferenz bereitstellenden Schaltungspunkte (10, 11) über ein Magnetventil (17) miteinander verbunden sind, das im angesteuerten Zustand geschlossen ist und im nicht angeschlossenen Zustand geöffnet ist und dabei die Schaltungspunkte (10, 11) pneumatisch miteinander verbindet.
EP20050797287 2004-10-06 2005-10-05 Zweistufiges servoventil Not-in-force EP1797338B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410048689 DE102004048689B3 (de) 2004-10-06 2004-10-06 Zweistufiges Servoventil
PCT/EP2005/055030 WO2006037793A1 (de) 2004-10-06 2005-10-05 Zweistufiges servoventil

Publications (2)

Publication Number Publication Date
EP1797338A1 EP1797338A1 (de) 2007-06-20
EP1797338B1 true EP1797338B1 (de) 2008-08-20

Family

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Family Applications (1)

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EP20050797287 Not-in-force EP1797338B1 (de) 2004-10-06 2005-10-05 Zweistufiges servoventil

Country Status (5)

Country Link
US (1) US7757714B2 (de)
EP (1) EP1797338B1 (de)
CN (1) CN100526659C (de)
DE (2) DE102004048689B3 (de)
WO (1) WO2006037793A1 (de)

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US20090283160A1 (en) 2008-05-02 2009-11-19 James Fishwick Fluid flow control device and control circuit
DE102009030888A1 (de) * 2009-06-29 2010-12-30 Robert Bosch Gmbh Ventilanordnung
DE102011007629B3 (de) 2011-04-18 2012-09-27 Siemens Aktiengesellschaft Elektropneumatischer Stellungsregler
US9387440B2 (en) 2011-09-30 2016-07-12 General Electric Company Desalination system with energy recovery and related pumps, valves and controller
US9644761B2 (en) 2011-09-30 2017-05-09 General Electric Company Desalination system with energy recovery and related pumps, valves and controller
US9897080B2 (en) 2012-12-04 2018-02-20 General Electric Company Rotary control valve for reverse osmosis feed water pump with energy recovery
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CN101035990A (zh) 2007-09-12
EP1797338A1 (de) 2007-06-20
WO2006037793A1 (de) 2006-04-13
US20080066814A1 (en) 2008-03-20
DE102004048689B3 (de) 2005-10-20
US7757714B2 (en) 2010-07-20
CN100526659C (zh) 2009-08-12
DE502005005145D1 (de) 2008-10-02

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