EP0211314B1 - Electromagnetic reciprocating-piston pump - Google Patents

Electromagnetic reciprocating-piston pump Download PDF

Info

Publication number
EP0211314B1
EP0211314B1 EP19860110045 EP86110045A EP0211314B1 EP 0211314 B1 EP0211314 B1 EP 0211314B1 EP 19860110045 EP19860110045 EP 19860110045 EP 86110045 A EP86110045 A EP 86110045A EP 0211314 B1 EP0211314 B1 EP 0211314B1
Authority
EP
European Patent Office
Prior art keywords
reciprocating piston
pistons
piston pump
tubes
cylindrical tubes
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.)
Expired
Application number
EP19860110045
Other languages
German (de)
French (fr)
Other versions
EP0211314A1 (en
Inventor
Erich Mildenberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
European Atomic Energy Community Euratom
Original Assignee
European Atomic Energy Community Euratom
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by European Atomic Energy Community Euratom filed Critical European Atomic Energy Community Euratom
Publication of EP0211314A1 publication Critical patent/EP0211314A1/en
Application granted granted Critical
Publication of EP0211314B1 publication Critical patent/EP0211314B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/042—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow
    • F04B17/044—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow using solenoids directly actuating the piston

Definitions

  • the invention relates to an electromagnetic reciprocating pump, in which a working piston in a cylinder tube made of non-magnetic material is moved back and forth by at least one coil seated on the outside of the cylinder tube and in which electromagnetically operated valves periodically close the inlet and outlet ports.
  • reciprocating piston pumps In most reciprocating piston pumps, the piston is pushed into a cylindrical cavity that is closed on one side (to generate overpressure) or pulled out of this cavity (to generate underpressure) via a connecting rod. Inlet and outlet ports open into this cavity, the valves of which are opened or closed at the unified moment.
  • reciprocating pumps have also become known (e.g. from DE-C-736 593), the pump energy of which is applied by coils which are seated on the outside of the non-magnetic cylinder and the pistons which act as a soft iron core in the interior of the cylinder push here.
  • Such pumps are particularly suitable for gas analysis purposes, since the entire displacement is hermetically sealed from the outside world in every piston position. Foreign gases that can penetrate the pump chamber along the piston wall in mechanically operated pumps therefore no longer occur and cannot impair the analysis result.
  • the object of the invention is to provide a reciprocating piston pump which is characterized by simple construction, vacuum tightness, simple maintenance and high operational reliability and is suitable for very sensitive gas analyzes.
  • Three brass tubes 1, 2, 3 are arranged parallel to one another and each end with a collector 4 or 5.
  • the brass tubes serve as pump cylinders and each contain a piston 6, 7 and 8 made of soft iron.
  • Two of the tubes, namely tubes 2 and 3, are provided in the area of brass ring 10 and 11 with a socket 18, 19, one of which forms the pressure side and the other the vacuum side of the pump.
  • the pistons 7 and 8 in the two pipes 2 and 3 provided with nozzles form valve pistons and are axially drilled on the end face, and the cylinder surface in the region of this bore is provided with a large number of holes, e.g. B. 20 provided.
  • the valve dynamics can be optimized by suitable size and distribution of these holes.
  • the two collectors 4 and 5 consist of brass tubes of larger cross-section than the cylinder tubes 1 to 3.
  • the collectors In alignment with each piston, the collectors have bores, e.g. B. 21, the screw plug, z. B. 22 are closed.
  • the end face of each stopper is provided with an elastic end stop 23 against which a piston can hit without damage in the event of a fault.
  • suitable control of the coils 12 to 17 ensures that the pistons do not advance further towards the collectors 4 and 5 than is shown in the figure.
  • the gas analysis pump according to the invention operates as follows:
  • the actual working piston, in which the pumping work is applied, is the massive piston 6 in the cylinder tube 1, which has no nozzle connection.
  • This piston is pushed alternately to the left and right by energizing the coils 12 and 13.
  • the two valve pistons 7 and 8 require significantly less energy for their displacement, since they act as electromagnetically actuated intake and exhaust valves.
  • the length of the brass pipes 1 to 3 between the collectors 4 and 5 was 20 cm, their diameter 1.8 cm and the wall thickness 1.5 mm.
  • the differential pressure between the two nozzles 18 and 19 of about 25 h Pa at an output of about 3 liters per minute.
  • a negative pressure of 10- 4 Pa could be built up against the environment without difficulty. Since foreign gases or vapors cannot penetrate into the pump on the working piston 6 or on the valve pistons 7 and 8, the pump according to the invention is particularly well suited for sucking gases to be analyzed in the direction of an analysis device.
  • the pump could also be made more compact by arranging the three cylinder tubes in a circle around a central axis of the pump.
  • the pistons do not need to consist of soft iron themselves, but can also contain only one soft iron core in the center, while they are otherwise made of non-magnetic material, for. B. brass or stainless steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Description

Die Erfindung bezieht sich auf eine elektromagnetische Hubkolbenpumpe, bei der ein Arbeitshubkolben in einem Zylinderrohr aus unmagnetischem Material durch mindestens eine außen auf dem Zylinderrohr sitzende Spule hin-und herbewegt wird und bei der elektromagnetisch betätigte Ventile den Einlaß-und den Auslaßstutzen periodisch verschließen.The invention relates to an electromagnetic reciprocating pump, in which a working piston in a cylinder tube made of non-magnetic material is moved back and forth by at least one coil seated on the outside of the cylinder tube and in which electromagnetically operated valves periodically close the inlet and outlet ports.

In den meisten Hubkolbenpumpen wird der Kolben über eine Pleuelstange in einen einseitig verschlossenen zylindrischen Hohlraum hineingedrückt (zur Erzeugung von Überdruck) oder aus diesem Hohlraum herausgezogen (zur Erzeugung von Unterdruck). In diesen Hohlraum münden Einlaß- bzw. Auslaßstutzen, deren Ventile im geeineten Augenblick geöffnet bzw. verschlossen werden. Es sind aber (z. B. aus der DE-C-736 593) auch schon Hubkolbenpumpen bekannt geworden, deren Pumpenergie von Spulen aufgebracht wird, die außen auf dem unmagnetischen Zylinder aufsitzen und den als Weicheisenkern wirkenden Kolben im Inneren des Zylinders hin- und herschieben. Solche Pumpen eignen sich insbesondere für Gasanalysezwecke, da der gesamte Hubraum in jeder Kolbenstellung hermetisch gegen die Außenwelt abgeschlossen ist. Fremdgase, die entlang der Kolbenwand in den Pumpraum bei mechanisch betätigten Pumpen eindringen können, treten somit nicht mehr auf und können das Analyseergebnis nicht beeinträchtigen.In most reciprocating piston pumps, the piston is pushed into a cylindrical cavity that is closed on one side (to generate overpressure) or pulled out of this cavity (to generate underpressure) via a connecting rod. Inlet and outlet ports open into this cavity, the valves of which are opened or closed at the unified moment. However, reciprocating pumps have also become known (e.g. from DE-C-736 593), the pump energy of which is applied by coils which are seated on the outside of the non-magnetic cylinder and the pistons which act as a soft iron core in the interior of the cylinder push here. Such pumps are particularly suitable for gas analysis purposes, since the entire displacement is hermetically sealed from the outside world in every piston position. Foreign gases that can penetrate the pump chamber along the piston wall in mechanically operated pumps therefore no longer occur and cannot impair the analysis result.

Bei empfindlichen Messungen hat sich jedoch herausgestellt, daß auch über die Ventile, die in den Einlaß- und Auslaßstutzesitzen, Fremdgase oder Öldämpfe eindringen können, die aber dadurch vermieden werden könnten, daß auch diese Ventile elektromagnetisch betätigt werden, indem ein Umschaltglied ähnlich einem Reedrelais in einem unmagnetischen Ventilkörper untergebracht wird. Solche Relais sind aber teuer und störanfällig.With sensitive measurements, however, it has been found that also through the valves, which can penetrate into the inlet and outlet ports, foreign gases or oil vapors, but which could also be avoided by these valves being actuated electromagnetically, by a changeover element similar to a reed relay in is housed in a non-magnetic valve body. Such relays are expensive and prone to failure.

Aufgabe der Erfindung ist es, eine Hubkolbenpumpe anzugeben, die sich durch einfache Konstruktion, Vakuumdichtheit, einfache Wartung und hohe Betriebssicherheit auszeichnet und für sehr empfindliche Gasanalysen geeignet ist.The object of the invention is to provide a reciprocating piston pump which is characterized by simple construction, vacuum tightness, simple maintenance and high operational reliability and is suitable for very sensitive gas analyzes.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß drei geradlinige Zylinderrohre parallel zueinander zwischen zwei Sammlern liegen, je einen mindestens teilweise weichmagnetischen Hubkolben enthalten und Außenspulen zur Bewegung des Kolbens tragen, daß zwei dieser Zylinderrohre jeweils in der zentralen Zone zwischen den Sammlern mit einem Stutzen versehen sind, der als Einlaß- bzw. Auslaßstutzen wirkt, wobei die Kolben in diesen Zylinderrohren, die sogenannten Ventilkolben, je nach ihrer Stellung den Stutzen entweder verschließen oder mit dem einen oder dem anderen Sammler in Verbindung bringen.This object is achieved in that three rectilinear cylinder tubes are parallel to one another between two collectors, each contain an at least partially soft magnetic reciprocating piston and carry outer coils for moving the piston in that two of these cylinder tubes are each provided with a connecting piece in the central zone between the collectors , which acts as an inlet or outlet port, the pistons in these cylinder tubes, the so-called valve pistons, depending on their position, either closing the port or connecting it to one or the other collector.

Bezüglich von Merkmalen bevorzugter Ausführungsformen der Erfindung wird auf die Unteransprüche verwiesen.With regard to features of preferred embodiments of the invention, reference is made to the subclaims.

Nachfolgend wird die Erfindung anhand eines bevorzugten Ausfürungsbeispiels mithilfe der Zeichnung näher erläutert, die einen Schnitt durch eine erfindungsgemäße Hubkolbenpumpe zeigt.The invention is explained in more detail below with the aid of a preferred exemplary embodiment with the aid of the drawing, which shows a section through a reciprocating piston pump according to the invention.

Drei Messingrohre 1,2,3 sind parallel zueinander angeordnet und münden mit ihren Enden in je einen Sammler 4 bzw. 5. Die Messingrohre dienen als Pumpzylinder und enthalten je einen Hubkolben 6, 7 und 8 aus Weicheisen. In der Mitte zwischen den beiden Sammlern 4 und 5 sitzt auf jedem der Rohre 1 bis 3 ein Messingring 9,10 und 11, zu dessen beiden Seiten je eine Spule 12, 13; 14,15 und 16, 17 auf das Rohr aufgesteckt ist. Zwei der Rohre, nämlich die Rohre 2 und 3, sind im Bereich des Messingrings 10 und 11 mit einem Stutzen 18, 19 versehen, von denen der eine die Druckseite und der andere die Unterdruckseite der Pumpe bildet. Die Kolben 7 und 8 in den beiden mit Stutzen versehenen Rohren 2 und 3 bilden Ventilkolben und sind stirnseitig axial angebohrt, und die Zylinderfläche im Bereich dieser Bohrung ist mit einer Vielzahl von Löchern, z. B. 20, versehen. Durch geeignete Größe und Verteilung dieser Löcher läßt sich die Ventildynamik optimieren.Three brass tubes 1, 2, 3 are arranged parallel to one another and each end with a collector 4 or 5. The brass tubes serve as pump cylinders and each contain a piston 6, 7 and 8 made of soft iron. In the middle between the two collectors 4 and 5 sits on each of the tubes 1 to 3 a brass ring 9, 10 and 11, on each side of which a coil 12, 13; 14, 15 and 16, 17 is attached to the tube. Two of the tubes, namely tubes 2 and 3, are provided in the area of brass ring 10 and 11 with a socket 18, 19, one of which forms the pressure side and the other the vacuum side of the pump. The pistons 7 and 8 in the two pipes 2 and 3 provided with nozzles form valve pistons and are axially drilled on the end face, and the cylinder surface in the region of this bore is provided with a large number of holes, e.g. B. 20 provided. The valve dynamics can be optimized by suitable size and distribution of these holes.

Die beiden Sammler 4 und 5 bestehen aus Messingrohren größeren Querschnitts als die Zylinderrohre 1 bis 3. In Flucht zu jedem Kolben besitzen die Sammler Bohrungen, z. B. 21, die mit Schraubstopfen, z. B. 22, verschlossen sind. Die Stirnseite jedes Stopfens ist mit einem elastischen Endanschlag 23 versehen, gegen den in einem Störungsfall ein Kolben ohne Beschädigung stoßen kann. Im Normalfall wird durch geeignete Steuerung der Spulen 12 bis 17 jedoch dafür gesorgt, daß die Kolben nicht weiter in Richtung auf die Sammler 4 und 5 vordringen, als in der Figur dargestellt ist.The two collectors 4 and 5 consist of brass tubes of larger cross-section than the cylinder tubes 1 to 3. In alignment with each piston, the collectors have bores, e.g. B. 21, the screw plug, z. B. 22 are closed. The end face of each stopper is provided with an elastic end stop 23 against which a piston can hit without damage in the event of a fault. In the normal case, however, suitable control of the coils 12 to 17 ensures that the pistons do not advance further towards the collectors 4 and 5 than is shown in the figure.

Die Betriebsweise der erfindungsgemäßen Gasanalysepumpe ist folgende:The gas analysis pump according to the invention operates as follows:

Der eigentliche Arbeitskolben, in dem die Pumparbeit aufgebracht wird, ist der massive Kolben 6 in dem Zylinderrohr 1, das keinen Stutzenanschluß besitzt. Dieser Kolben wird durch Erregung der Spulen 12 und 13 abwechselnd nach links und rechts geschoben. Die beiden Ventilkolben 7 und 8 benötigen wesentlich weniger Energie für ihre Verschiebung, da sie als elektromagnetisch betätigte Einlaß- und Auslaßventile wirken. Je nach der Phasenlage, in der die Kolben 7 und 8 bezüglich des Kolbens 6 gesteuert werden, ergibt sich am Stutzen 18 ein Unterdruck oder Überdruck gegenüber einem konstanten Druck, z. B. der Atmosphäre, am Stutzen 19. Da die Anordnung völlig symmetrisch ist, sind auch die Funktionen der Stutzen 18 und 19 umkehrbar.The actual working piston, in which the pumping work is applied, is the massive piston 6 in the cylinder tube 1, which has no nozzle connection. This piston is pushed alternately to the left and right by energizing the coils 12 and 13. The two valve pistons 7 and 8 require significantly less energy for their displacement, since they act as electromagnetically actuated intake and exhaust valves. Depending on the phase position in which the pistons 7 and 8 are controlled with respect to the piston 6, there is a negative pressure or positive pressure on the nozzle 18 compared to a constant pressure, for. B. the atmosphere, on the nozzle 19. Since the arrangement is completely symmetrical, the functions of the nozzle 18 and 19 are reversible.

Bei einem ausgeführten Modell der erfindungsgemäßen Pumpe betrug die Länge der Messingrohre 1 bis 3 zwischen den Sammlern 4 und 5 20 cm, ihr Durchmesser 1,8 cm und die Wandstärke 1,5 mm. Bei einer Pumpfrequenz von 100 Zyklen pro Minute ließ sich ein Differenzdruck zwischen den beiden Stutzen 18 und 19 von etwa 25 h Pa bei einer Leistung von etwa 3 Litern pro Minute messen. Gegen die Umgebung konnte ein Unterdruck von 10-4 Pa ohne Schwierigkeiten aufgebaut werden. Da weder am Arbeitskolben 6 noch an den Ventilkolben 7 und 8 Fremdgase oder Dämpfe in die Pumpe eindringen können, eignet sich die erfindungsgemäße Pumpe besonders gut zum Ansaugen von zu analysierenden Gasen in Richtung auf ein Analysegerät.In one model of the pump according to the invention, the length of the brass pipes 1 to 3 between the collectors 4 and 5 was 20 cm, their diameter 1.8 cm and the wall thickness 1.5 mm. At a pumping frequency of 100 cycles per minute it got involved Measure the differential pressure between the two nozzles 18 and 19 of about 25 h Pa at an output of about 3 liters per minute. A negative pressure of 10- 4 Pa could be built up against the environment without difficulty. Since foreign gases or vapors cannot penetrate into the pump on the working piston 6 or on the valve pistons 7 and 8, the pump according to the invention is particularly well suited for sucking gases to be analyzed in the direction of an analysis device.

Besonders bemerkenswert an der erfindungsgemäßen Pumpe ist der nahezu identische Aufbau des Arbeitszylinders und der Ventilzylinder, was die Wartung und Betriebssicherheit der Pumpe verbessert. Zudem stehen mit den zu pumpenden Gasen nur Metalle in Berührung, nicht aber Kunststoffe oder andere ausdampfbare Materialien, durch die die Analyse verfälscht werden könnte.What is particularly remarkable about the pump according to the invention is the almost identical structure of the working cylinder and the valve cylinder, which improves the maintenance and operational safety of the pump. In addition, only gases are in contact with the gases to be pumped, but not plastics or other vaporizable materials that could falsify the analysis.

Die Erfindung ist nicht auf das im einzelnen dargestellte Ausführungsbeispiel beschränkt. So könnte im Rahmen der Erfindung die Pumpe auch kompakter ausgeführt werden, indem die drei Zylinderrohre um eine Mittelachse der Pumpe herum im Kreis angeordnet werden.The invention is not restricted to the exemplary embodiment shown in detail. In the context of the invention, the pump could also be made more compact by arranging the three cylinder tubes in a circle around a central axis of the pump.

Im Rahmen der Erfindung brauchen auch die Kolben nicht selbst aus Weicheisen zu bestehen, sondern können auch nur einen Weicheisenkern im Zentrum enthalten, während sie im übrigen aus unmagnetischem Material, z. B. Messing oder Edelstahl, bestehen.In the context of the invention, the pistons do not need to consist of soft iron themselves, but can also contain only one soft iron core in the center, while they are otherwise made of non-magnetic material, for. B. brass or stainless steel.

Claims (5)

1. An electromagnetic reciprocating piston pump, in which a reciprocating piston is moved to and from in a cylindrical tube made of nonmagnetic material by means of at least one coil arranged on the outside of the cylindrical tube, and in which electromagnetically actuated valves periodically close the inlets and outlets, characterized in that three straight cylindrical tubes (1, 2, 3) are arranged parallel to one another between two collectors (4, 5), each tube containing a reciprocating piston (6, 7, 8) which is at least partially made of soft iron, and carrying outer coils (12 to 17) for moving the piston, and in that two of these cylindrical tubes (2, 3) are each provided, in the central zone between the collectors, with a connection piece (18, 19) which acts as an inlet or outlet respectively, wherein the pistons in these cylindrical tubes, the so-called valve pistons, depending on their position, either close the connection piece or put it in communication with one collector or the other.
2. A reciprocating piston pump according to claim 1, characterized in that two coils (12,13; 14, 15; 16, 17) are arranged on each of the cylindrical tubes (1, 2, 3) on either side of the central zone.
3. A reciprocating piston pump according to one of claims 1 and 2, characterized in that an elastic limit stop (23) is provided in alignment with each piston (6 to 8) in each collector (4, 5).
4. A reciprocating piston pump according to one of claims 1 to 3, characterized in that the pistons in the two cylindrical tubes (2, 3) carrying the connection pieces, the so-called valve pistons, have coaxial bores in the two end faces, and in that the side walls of these pistons have holes (20) in the region of this axial bore.
5. A reciprocating piston pump according to one of claims 1 to 4, characterized in that the three cylindrical tubes (1, 2, 3) lie next to one another on one plane, and in that the collectors (4, 5) are likewise designed as tubes.
EP19860110045 1985-07-23 1986-07-22 Electromagnetic reciprocating-piston pump Expired EP0211314B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU86015 1985-07-23
LU86015A LU86015A1 (en) 1985-07-23 1985-07-23 ELECTROMAGNETIC PISTON PUMP

Publications (2)

Publication Number Publication Date
EP0211314A1 EP0211314A1 (en) 1987-02-25
EP0211314B1 true EP0211314B1 (en) 1988-11-02

Family

ID=19730517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860110045 Expired EP0211314B1 (en) 1985-07-23 1986-07-22 Electromagnetic reciprocating-piston pump

Country Status (7)

Country Link
EP (1) EP0211314B1 (en)
DE (1) DE3661098D1 (en)
DK (1) DK345086A (en)
ES (1) ES2019709A6 (en)
IE (1) IE57248B1 (en)
LU (1) LU86015A1 (en)
PT (1) PT83046B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19860573A1 (en) * 1998-12-29 2000-07-06 Eberspaecher J Gmbh & Co Fuel metering pump for a heater, in particular for an auxiliary heater or auxiliary heater of a motor vehicle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE736593C (en) * 1940-11-01 1943-06-23 Johannes Krutzsch Dr Ing Magnetic piston pump
FR1451060A (en) * 1965-10-22 1966-06-24 Magnetically driven pump

Also Published As

Publication number Publication date
DK345086A (en) 1987-01-24
IE861945L (en) 1987-01-23
EP0211314A1 (en) 1987-02-25
PT83046A (en) 1986-08-01
PT83046B (en) 1992-08-31
DE3661098D1 (en) 1988-12-08
IE57248B1 (en) 1992-06-17
DK345086D0 (en) 1986-07-21
ES2019709A6 (en) 1991-07-01
LU86015A1 (en) 1986-08-04

Similar Documents

Publication Publication Date Title
DE3876169T2 (en) DOUBLE DIAPHRAGM PUMP.
EP0872674B1 (en) Pressure-compensated solenoid valve
DE4136805C2 (en)
DE3713997A1 (en) FLUID CYLINDER
DE3739337A1 (en) VALVE ARRANGEMENT
DE4024726A1 (en) DIAPHRAGM VALVE
DE19616191A1 (en) Control valve for a diaphragm pump
DE3702432C2 (en) Screw compressor with stroke valves for power control
EP0211314B1 (en) Electromagnetic reciprocating-piston pump
DE3341643A1 (en) Pilot-controlled pressure relief and control valve
DE2744917B2 (en) Seat valve with straight passage
CH630443A5 (en) Double-acting piston pump
DE1653468A1 (en) Pump driven by vacuum
DE4326447A1 (en) Hydraulic valve for a stabiliser control on a motor vehicle
DE2309797A1 (en) PRESSURE TRANSDUCER
EP2728226A1 (en) Vacuum valve
DE2003739A1 (en) Valve with a valve chamber receiving a valve body
DE4018153A1 (en) Hydraulic fluid pump - has pressure value which is controlled by spring assembly
DD210107B1 (en) DOUBLE-ACTING DRUCKWANDLER
DE3417770C2 (en)
DE3606102A1 (en) SWIVEL DRIVE
DE3041339A1 (en) Electropneumatic servo valve - has spring oscillating piston moved by two EM transducers
DE19948342A1 (en) Piston pump comprises linear drive having magnetic armature coupled with piston and working chambers each associated with valve carrier
DE69019883T2 (en) Dosing diaphragm pump for aggressive liquids.
DE19622266C1 (en) Working air control valve

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE FR GB IT LU NL

17P Request for examination filed

Effective date: 19870825

17Q First examination report despatched

Effective date: 19880119

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT LU NL

REF Corresponds to:

Ref document number: 3661098

Country of ref document: DE

Date of ref document: 19881208

ET Fr: translation filed
ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19900917

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910612

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910726

Year of fee payment: 6

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19910731

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19920122

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19920127

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19920401

EPTA Lu: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19920722

Ref country code: GB

Effective date: 19920722

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19920731

BERE Be: lapsed

Owner name: EUROPAISCHE ATOMGEMEINSCHAFT (EURATOM)

Effective date: 19920731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930201

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19920722

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930331

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050722