EP0905380B1 - Device for purging air - Google Patents

Device for purging air Download PDF

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Publication number
EP0905380B1
EP0905380B1 EP98118287A EP98118287A EP0905380B1 EP 0905380 B1 EP0905380 B1 EP 0905380B1 EP 98118287 A EP98118287 A EP 98118287A EP 98118287 A EP98118287 A EP 98118287A EP 0905380 B1 EP0905380 B1 EP 0905380B1
Authority
EP
European Patent Office
Prior art keywords
filter
opening
air purging
air
chamber
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 - Lifetime
Application number
EP98118287A
Other languages
German (de)
French (fr)
Other versions
EP0905380A2 (en
EP0905380A3 (en
Inventor
Thomas Materne
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.)
Wilo SE
Original Assignee
Wilo AG
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 Wilo AG filed Critical Wilo AG
Publication of EP0905380A2 publication Critical patent/EP0905380A2/en
Publication of EP0905380A3 publication Critical patent/EP0905380A3/en
Application granted granted Critical
Publication of EP0905380B1 publication Critical patent/EP0905380B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/02—Self-priming pumps
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/20—Filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Definitions

  • the invention relates to a device for filtration and simultaneous air separation of water circuits, especially on pumps.
  • a generic device is known from the publication DE 92 08 801 U.
  • Water in heating or sanitary facilities is often through Rust, solder residues, lime abrasive substances etc. moved or dirty. If it is not filtered, it can it in the system in heat exchangers, pumps, valves etc. damage.
  • the object of the invention is a replaceable Creating device operating in a water cycle, especially in the return of a pump housing can be integrated.
  • the device is used on the one hand to filter the Water before it through the downstream components, such as Pump motor, heat exchanger, valves etc. one Boiler etc. flows. Second, through this Device separates the air from the water, then through the automatic bleeder integrated in the pump to be eliminated. It has been shown that a small ventilation space compared to known ones Vent pumps is sufficient.
  • the Vent chamber is disc-shaped and a level to Back has parallel front.
  • you can the front is (partially) spherical.
  • the level in particular Filter as a filter disk parallel to the rear, in particular between the front and back, detachable is attached.
  • the filter disc can outer, in particular at least partially circular Have frames.
  • the filter can be easily replaced if the filter frame by locking means in the Vent chamber is releasably attached.
  • the device has a housing 11 with a curved, in particular partially spherical or flat Front 12 and a back 13 parallel to it. There is one between the front and back Vent chamber 5. With the flat back 13 is the Device on a flat connection surface of a pump attachable, which has a suction and pressure opening. In there is an inlet opening 14 on the flat rear side and an outlet opening 15 which is connected to the pressure opening and the suction opening of the pump or hydraulic system are connected.
  • the device has a fine-mesh filter 3, the optionally surrounded by a frame 4.
  • the Frame stiffens, especially when choosing an unstable Filter material the filter.
  • This filter unit will inserted into the chamber 5 of the connection adapter 1 in such a way that the suctioned water first flows through the filter must before it gets into the spiral space of the pump. As a result, the water is filtered.
  • the filter unit also forms the partition between an unfiltered suction side Vent chamber 5 and a vented, filtered Area 6 of the connection adapter 1. This vented, the filtered area can, if necessary, directly Form spiral space or be in front of it.
  • the mesh size of the filter must be designed in this way be that the air to be separated by the Filters of the water to be transported to a high degree be separated. It is also important to ensure that the Filter does not become dirty too quickly.
  • a material can including a braid made of stainless steel or a plastic filter can be used. Since it's in the course the filter will become dirty during the period of use can, there is an opening 7 in at a suitable location this provided by the closed filter the water can flow into the spiral space of the pump.
  • the Position of the opening is determined by the arrangement of Suction nozzle 8, and automatic vent 9 and through the Inner contour of the connection adapter 10 or pump housing dependent.
  • the attachment of the filter unit should be releasable Snappers 17, press fits etc. are carried out to to achieve a quick exchange and assembly.
  • the position and shape of the unit is determined by the Design and the nozzle arrangement of the housing certainly.
  • the automatic vent 9 works as follows:
  • the air or air bubbles to be discharged are due to their buoyancy from a pipeline or a Vent chamber in the housing of the quick breather.
  • This housing is covered by the cover of the Quick exhaust valve tightly closed.
  • On the lid is the entire ventilation mechanism is installed.
  • the air can flow between the piston and the O-ring escape until the float rises through the Water level the piston back to the lever Has pressed the O-ring.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung betrifft eine Einrichtung zur Filtrierung und gleichzeitigen Luftabscheidung von Wasserkreisläufen, insbesondere an Pumpen. Eine gattungsgemässe Einrichtung ist bekannt aus der Druckschrift DE 92 08 801 U.The invention relates to a device for filtration and simultaneous air separation of water circuits, especially on pumps. A generic device is known from the publication DE 92 08 801 U.

In hydraulischen Systemen kommt es häufig vor, daß Behälter mit einem Medium, insbesondere Wasser, zu befüllen sind, deren Zu- und Abläufe sich nicht an den obersten Stellen des Behälters befinden. Diese Räume können nicht vollständig befüllt werden, es verbleibt Restluft im Behälter. Weiterhin kann es aufgrund von Leckagen im System zu Wasserverlust und daraus resultierend zu Lufteinschlüssen kommen. Die Luft muß hierbei kontinuierlich abgeschieden werden. Hierzu müssen an den höchsten Stellen im Heizungssystem Entlüftungsmöglichkeiten vorgesehen werden, die die Luft abführen. Da diese Art der Entlüftung wartungs- und kostenintensiv ist, ist es bekannt, die Funktion in eine Heizungspumpe zu integrieren. Somit ist ein Austausch der Entlüftungseinheit durch die zentral eingebaute und gut zugängliche Pumpe einfach und schnell durchführbar. Spezielle Strömungsführungen oder Luftabscheideflächen und -kammern stellen innerhalb einer speziellen Entlüftungspumpe eine effiziente Abscheideleistung sicher.In hydraulic systems it often happens that Containers with a medium, in particular water are filled, the inflows and outflows of which are not top of the container. These spaces cannot be filled completely, it remains Residual air in the container. Furthermore, due to Leakage in the system to water loss and from it resulting in air pockets. The air must are continuously deposited here. To do this at the highest points in the heating system Venting options are provided that block the air dissipate. Since this type of ventilation is maintenance and is costly, it is known to function in one Integrate heating pump. So there is an exchange the ventilation unit through the centrally installed and easily accessible pump can be carried out quickly and easily. Special flow guides or air separation areas and chambers pose within a special Vent pump an efficient separation performance for sure.

Wasser in Heizungs- bzw. Sanitäranlagen ist oft durch Rost, Lotrückstanden, Kalk abrasiven Stoffen usw. versetzt bzw. verschmutzt. Wird es nicht gefiltert, kann es im System in Wärmetauschern, den Pumpen, Ventilen usw. zu Schäden kommen.Water in heating or sanitary facilities is often through Rust, solder residues, lime abrasive substances etc. moved or dirty. If it is not filtered, it can it in the system in heat exchangers, pumps, valves etc. damage.

Aufgabe der Erfindung ist es, eine auswechselbare Vorrichtung zu schaffen, die in einem Wasserkreislauf, insbesondere in den Rücklauf eines Pumpengehäuses integrierbar ist.The object of the invention is a replaceable Creating device operating in a water cycle, especially in the return of a pump housing can be integrated.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst,

  • daß die Vorrichtung eine Entlüftungskammer aufweist, mit einer an einer ebenen Seitenfläche einer Anschlußvorrichtung, insbesondere einer Pumpe, befestigbaren ebenen Rückseite, die eine Einlaßöffnung und eine Auslaßöffnung aufweist, die mit Saugöffnung bzw. Drucköffnung der Anschlußvorrichtung übereinstimmen, wobei Saug- und Drucköffnung der Anschlußvorrichtung in der Seitenfläche der Anschlußvorrichtung liegen,
  • daß oberhalb der Entlüftungskammer ein selbsttätig arbeitender Entlüfter angeordnet ist,
  • und daß in der Entlüftungskammer ein Filter angeordnet ist, durch das das Wasser von der Entlüftungskammer zur Anschlußvorrichtung strömt, wobei der Filter in Strömungsrichtung hinter der zum Entlüften führenden Öffnung angeordnet ist.
According to the invention, this object is achieved by
  • that the device has a ventilation chamber, with a flat rear side which can be fastened to a flat side face of a connection device, in particular a pump, and which has an inlet opening and an outlet opening which correspond to the suction opening and pressure opening of the connection device, suction and pressure opening of the connection device in the side surface of the connection device,
  • that an automatically working ventilator is arranged above the venting chamber,
  • and that a filter is arranged in the ventilation chamber, through which the water flows from the ventilation chamber to the connection device, the filter being arranged in the flow direction behind the opening leading to ventilation.

Die Vorrichtung dient zum einen zur Filtrierung des Wassers bevor es durch die nachgeschalteten Bauteile, wie Pumpenmotor, Wärmetauscher, Ventile etc. eines Heizungskessels etc. fließt. Zum anderen wird durch diese Vorrichtung die Luft vom Wasser getrennt, um dann durch den in der Pumpe integrierten Automatikentlüfter ausgeschieden zu werden. Es hat sich gezeigt, daß ein kleiner Entlüftungsraum im Vergleich zu bekannten Entlüftungspumpen ausreichend ist.The device is used on the one hand to filter the Water before it through the downstream components, such as Pump motor, heat exchanger, valves etc. one Boiler etc. flows. Second, through this Device separates the air from the water, then through the automatic bleeder integrated in the pump to be eliminated. It has been shown that a small ventilation space compared to known ones Vent pumps is sufficient.

Die Vorteile sind unter anderem:

  • Kompakte Bauweise (kleine Entlüftungskammer)
  • kostengünstige Ausführung
  • zwei Funktionen durch ein Bauteil
  • einfacher Austausch an zentral eingebauter Pumpe
  • einfache Realisierung einer Trennwand zwischen Entlüftungskammer und Spiralraum.
The advantages include:
  • Compact design (small ventilation chamber)
  • economical execution
  • two functions by one component
  • easy replacement on a centrally installed pump
  • Simple implementation of a partition between the ventilation chamber and the spiral room.

Vorzugsweise wird vorgeschlagen, daß die Entlüftungskammer scheibenförmig ist und eine ebene zur Rückseite parallele Vorderseite aufweist. Alternativ kann die Vorderseite (teil-) kugelförmig sein.It is preferably proposed that the Vent chamber is disc-shaped and a level to Back has parallel front. Alternatively, you can the front is (partially) spherical.

Besonders vorteilhaft ist es, wenn der insbesondere ebene Filter als Filterscheibe parallel zur Rückseite, insbesondere zwischen Vorder- und Rückseite, lösbar befestigt ist. Hierbei kann die Filterscheibe einen äußeren, insbesondere zumindest teilsweise kreisrunden Rahmen aufweisen.It is particularly advantageous if the level in particular Filter as a filter disk parallel to the rear, in particular between the front and back, detachable is attached. Here, the filter disc can outer, in particular at least partially circular Have frames.

Ein leichtes Auswechseln des Filters ist gegeben, wenn der Filterrahmen durch Rastmittel in der Entlüftungskammer lösbar befestigt ist.The filter can be easily replaced if the filter frame by locking means in the Vent chamber is releasably attached.

Eine einfache Konstruktion ist gegeben, wenn die Filterscheibe in ihren Außenabmessungen den Innenabmessungen der Kammer entspricht. Besonders vorteilhaft und platzsparend ist es, wenn die Vorder- und Rückseite der Vorrichtung zueinander parallel sind.A simple construction is given if the Filter disc in its outer dimensions Internal dimensions of the chamber corresponds. Especially It is advantageous and space-saving if the front and Back of the device are parallel to each other.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen

Fig. 1
einen senkrechten Schnitt durch die Vorrichtung,
Fig. 2
einen Schnitt nach I-I in Fig. 1.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it
Fig. 1
a vertical section through the device,
Fig. 2
a section according to II in Fig. 1st

Die Vorrichtung weist ein Gehäuse 11 auf, mit einer gewölbten, insbesondere teilkugelförmigen oder flachen Vorderseite 12 und einer dazu parallelen Rückseite 13. Zwischen Vorder- und Rückseite liegt eine Entlüftungskammer 5. Mit der ebenen Rückseite 13 ist die Vorrichtung an einer ebenen Anschlußfläche einer Pumpe befestigbar, die eine Saug- und Drucköffnung aufweist. In der ebenen Rückseite befinden sich eine Einlaßöffnung 14 und eine Auslaßöffnung 15, die mit der Drucköffnung und der Saugöffnung der Pumpe bzw. des hydraulischen Systems verbunden sind. The device has a housing 11 with a curved, in particular partially spherical or flat Front 12 and a back 13 parallel to it. There is one between the front and back Vent chamber 5. With the flat back 13 is the Device on a flat connection surface of a pump attachable, which has a suction and pressure opening. In there is an inlet opening 14 on the flat rear side and an outlet opening 15 which is connected to the pressure opening and the suction opening of the pump or hydraulic system are connected.

Die Vorrichtung weist ein feinmaschiges Filter 3 auf, das gegebenenfalls durch einen Rahmen 4 umgeben ist. Der Rahmen versteift, insbesondere bei Wahl eines labilen Filtermaterials den Filter. Diese Filtereinheit wird derart in die Kammer 5 des Anschlußadapters 1 eingesetzt, daß das angesaugte Wasser zuerst durch den Filter fließen muß, bevor es in den Spiralraum der Pumpe gelangt. Hierdurch wird ein Filtrieren des Wassers erreicht. Weiterhin bildet die Filtereinheit auch die Trennwand zwischen einer saugseitigen nichtgefilterten Entlüftungskammer 5 und einem entlüftetem, gefilterten Bereich 6 des Anschlußadapters 1. Dieser entlüftete, gefilterte Bereich kann gegebenenfalls direkt den Spiralraum bilden oder aber diesem vorgesetzt sein.The device has a fine-mesh filter 3, the optionally surrounded by a frame 4. The Frame stiffens, especially when choosing an unstable Filter material the filter. This filter unit will inserted into the chamber 5 of the connection adapter 1 in such a way that the suctioned water first flows through the filter must before it gets into the spiral space of the pump. As a result, the water is filtered. The filter unit also forms the partition between an unfiltered suction side Vent chamber 5 and a vented, filtered Area 6 of the connection adapter 1. This vented, the filtered area can, if necessary, directly Form spiral space or be in front of it.

Die Maschenweite des Filters muß derart ausgeführt werden, daß die abzuscheidenden Luftanteile durch den Filter von dem zu transportierenden Wasser im hohen Maße getrennt werden. Weiterhin ist darauf zu achten, daß der Filter nicht zu schnell verschmutzt. Als Material kann unter anderem ein Geflecht aus nichtrostendem Stahl oder ein Kunststoffilter eingesetzt werden. Da es im Verlauf der Einsatzdauer zur Verschmutzung des Filters kommen kann, ist an einer geeigneten Stelle eine Öffnung 7 in diesem vorgesehen, durch die bei verschlossenem Filter das Wasser in den Spiralraum der Pumpe fließen kann. Die Position der Öffnung wird durch die Anordnung von Saugstutzen 8, und Automatikentlüfter 9 sowie durch die Innenkontur des Anschlußadapters 10 bzw. Pumpengehäuses abhängig.The mesh size of the filter must be designed in this way be that the air to be separated by the Filters of the water to be transported to a high degree be separated. It is also important to ensure that the Filter does not become dirty too quickly. As a material can including a braid made of stainless steel or a plastic filter can be used. Since it's in the course the filter will become dirty during the period of use can, there is an opening 7 in at a suitable location this provided by the closed filter the water can flow into the spiral space of the pump. The Position of the opening is determined by the arrangement of Suction nozzle 8, and automatic vent 9 and through the Inner contour of the connection adapter 10 or pump housing dependent.

Die Befestigung der Filtereinheit sollte lösbar durch Schnapper 17, Presspassungen etc. ausgeführt werden, um einen schnellen Austausch und Montage zu erreichen. The attachment of the filter unit should be releasable Snappers 17, press fits etc. are carried out to to achieve a quick exchange and assembly.

Die Position und Form der Einheit wird durch die Gestaltung und der Stutzenanordnung des Gehäuses bestimmt.The position and shape of the unit is determined by the Design and the nozzle arrangement of the housing certainly.

Der automatische Entlüfter 9 arbeitet wie folgt:The automatic vent 9 works as follows:

Die abzuleitende Luft bzw. Luftblasen gelangen aufgrund ihrer Auftriebskraft aus einer Rohrleitung oder einer Entlüftungskammer in das Gehäuse des Schnellentlüfters. Dieses Gehäuse wird durch den Deckel des Schnellentlüfters dicht verschlossen. An dem Deckel ist die gesamte Entlüftungsmechanik montiert. Ein Kolben, der über einen Hebel mit einem Schwimmer verbunden ist, dichtet die Einheit bei luftfreiem Zustand über einen O-Ring nach außen ab.The air or air bubbles to be discharged are due to their buoyancy from a pipeline or a Vent chamber in the housing of the quick breather. This housing is covered by the cover of the Quick exhaust valve tightly closed. On the lid is the entire ventilation mechanism is installed. A piston that connected to a float by a lever, seals the unit via an air-free condition O-ring to the outside.

Gelangt Luft in das Gehäuse, sinkt der Schwimmer mit dem Wasserniveau nach unten, wodurch auch der Kolben durch den Hebel nach unten gezogen wird und die O-Ringabdichtung aufhebt.If air gets into the housing, the float sinks with it Water level down, which also causes the piston to pass through the lever is pulled down and the O-ring seal cancels.

Die Luft kann solange zwischen Kolben und O-Ring entweichen, bis der Schwimmer durch den steigenden Wasserspiegel den Kolben über den Hebel wieder an den O-Ring gedrückt hat.The air can flow between the piston and the O-ring escape until the float rises through the Water level the piston back to the lever Has pressed the O-ring.

Claims (8)

  1. Device for purging air in a water circuit, in particular to a pump, characterized in that
    the device has an air purging chamber having a planar rear side (13) that can be fastened to a planar side face of a connection device, in particular of a pump, the rear side (13) having an inlet opening (14) and an outlet opening (15) matching the intake opening and the delivery opening, respectively, of the connection device, the intake opening and the delivery opening of the connection device being arranged in the side face of the connection device;
    an independently operating venting device (9) is arranged above the air purging chamber (5); and
    inside the air purging chamber (5) a filter (3) is arranged through which the water flows from the air purging chamber to the connection device, the filter being arranged in the direction of the flow downstream of the opening (16) leading to the air purging device.
  2. Device according to claim 1 characterized in that the air purging chamber is discoid and has a planar front surface (12) that is parallel to the rear surface.
  3. Device according to claim 1 characterized in that the front surface (12) is (partially) spherical.
  4. Device according to any one of the preceding claims, characterized in that the particularly planar filter (3) is a disk-type filter releasably fastened between the front surface (12) and the rear surface (13) and in parallel to the said surfaces.
  5. Device according to claim 4 characterized in that the disk-type filter (3) has an outer frame, in particular an outer frame that is at least partially circular.
  6. Device according to claim 5 characterized in that the filter frame (4) is releasably fastened inside the air purging chamber (5) by latching means.
  7. Device according to one of claims 4 to 6, characterized in that the outside dimensions of the disk-type filter (3) correspond to the inside dimensions of the chamber (5).
  8. Device according to any one of the preceding claims, characterized in that the front surface (12) and the rear surface (13) of the device are arranged parallel to each other.
EP98118287A 1997-09-30 1998-09-28 Device for purging air Expired - Lifetime EP0905380B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19743062 1997-09-30
DE19743062A DE19743062A1 (en) 1997-09-30 1997-09-30 Air separation device

Publications (3)

Publication Number Publication Date
EP0905380A2 EP0905380A2 (en) 1999-03-31
EP0905380A3 EP0905380A3 (en) 2001-01-10
EP0905380B1 true EP0905380B1 (en) 2002-12-18

Family

ID=7844050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98118287A Expired - Lifetime EP0905380B1 (en) 1997-09-30 1998-09-28 Device for purging air

Country Status (2)

Country Link
EP (1) EP0905380B1 (en)
DE (2) DE19743062A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061558A1 (en) * 2007-12-18 2009-06-25 Wilo Ag Centrifugal pump with ventilation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20005247U1 (en) 2000-03-21 2000-05-25 Grundfos A/S, Bjerringbro Centrifugal pump unit
DE102008052884A1 (en) * 2008-10-23 2010-05-06 Wilo Se pump housing

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US3290864A (en) * 1965-08-10 1966-12-13 Itt Gas separation pump for liquid circulating systems
DK132807C (en) * 1967-05-05 1976-07-12 Grundfos As BAG PUMP, ISER CIRCULATION PUMP FOR CENTRAL HEATING SYSTEM
DE1653725A1 (en) * 1967-09-29 1972-01-13 Hanning Elektro Werke Circulation pump for heating systems
DE1937119A1 (en) * 1969-07-22 1971-02-04 Loewe Pumpenfabrik Gmbh Centrifugal pump with gas separation
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US3782508A (en) * 1971-07-02 1974-01-01 Ford Motor Co Releasable caliper retaining means for a disc brake
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DE3109918C2 (en) * 1981-03-14 1989-03-16 Wilo-Werk Gmbh & Co Pumpen- Und Apparatebau, 4600 Dortmund Liquid pump with gas separation chamber
DE8614107U1 (en) * 1986-05-24 1986-09-25 Deutsche Vortex GmbH, 4050 Mönchengladbach Fluid pump
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DE3708950A1 (en) * 1987-03-19 1988-09-29 Werner Kemmelmeyer Method for continuous degassing of liquid pressure vessels and apparatus for carrying it out
DE9208801U1 (en) * 1992-07-01 1992-09-03 Grundfos A/S, Bjerringbro Pump unit
DE4424575A1 (en) * 1994-07-13 1996-01-18 Bruno Bachhofer Degassing valve for liq. tank with float chamber having float valve
DE4439962A1 (en) * 1994-11-09 1996-05-15 Lang Apparatebau Gmbh Dosing pump with venting device
DE19610457A1 (en) * 1996-03-16 1997-09-18 Pfeiffer Erich Gmbh & Co Kg Discharge device for media

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061558A1 (en) * 2007-12-18 2009-06-25 Wilo Ag Centrifugal pump with ventilation

Also Published As

Publication number Publication date
EP0905380A2 (en) 1999-03-31
DE59806699D1 (en) 2003-01-30
DE19743062A1 (en) 1999-04-01
EP0905380A3 (en) 2001-01-10

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