EP0085725B1 - Piston-driven diaphragm pump - Google Patents

Piston-driven diaphragm pump Download PDF

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Publication number
EP0085725B1
EP0085725B1 EP82100833A EP82100833A EP0085725B1 EP 0085725 B1 EP0085725 B1 EP 0085725B1 EP 82100833 A EP82100833 A EP 82100833A EP 82100833 A EP82100833 A EP 82100833A EP 0085725 B1 EP0085725 B1 EP 0085725B1
Authority
EP
European Patent Office
Prior art keywords
support plate
piston
diaphragm
control rod
closing body
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
EP82100833A
Other languages
German (de)
French (fr)
Other versions
EP0085725A1 (en
Inventor
Rüdiger Bräuer
Dirk Petersen
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.)
SPX Flow Technology Germany GmbH
Original Assignee
Bran und Luebbe GmbH
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 Bran und Luebbe GmbH filed Critical Bran und Luebbe GmbH
Priority to DE8282100833T priority Critical patent/DE3261319D1/en
Priority to EP82100833A priority patent/EP0085725B1/en
Priority to AT82100833T priority patent/ATE10533T1/en
Priority to JP57058962A priority patent/JPS58138286A/en
Priority to US06/377,573 priority patent/US4465438A/en
Publication of EP0085725A1 publication Critical patent/EP0085725A1/en
Application granted granted Critical
Publication of EP0085725B1 publication Critical patent/EP0085725B1/en
Expired 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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston

Definitions

  • the invention relates to a piston diaphragm pump with a diaphragm separating the delivery and the piston working space, which is actuated via the hydraulic medium completely filling the piston working space by a piston oscillating back and forth in this space, and with a reservoir for the hydraulic medium, which is provided with a refill valve is in communication with the piston working space, and a spring plate for the diaphragm, which is arranged displaceably under spring pressure, a refill valve opening in the direction towards the storage container being provided between the reservoir for the hydraulic medium and the piston working space.
  • the object of the invention while avoiding the disadvantages shown, is to design the piston diaphragm pump of the type mentioned at the outset in such a way that even with increasing size, a minimum of masses to be accelerated is required, while at the same time lower internal pressure losses should occur.
  • the support plate in the piston work space is arranged freely movable and tiltable within limits, in the pump housing a separate from the support plate, directed towards the radially outer region of the control plunger between a protruding position in the direction of the support plate and one on the other hand, axially pushed back release position is guided displaceably, a spring pressing it permanently into its locking position against the control tappet and the support plate in the locked position of the control tappet can be pressed against the spring-loaded control tappet with a radially outer region in order to press it against the spring in its release position move.
  • the support plate is now freely movable and can move or tilt against the pressure of the spring acting on the control tappet and thus trigger the refill.
  • a tumbler arranged between the control plunger and the valve is provided for locking or releasing the refill valve.
  • the control plunger expediently has a conical circumferential rotation along which the tumbler slides during the displacement of the control plunger.
  • the control plunger When actuated, the control plunger preferably abuts the support plate in its peripheral area.
  • a plurality of springs are preferably provided which engage on the circumference of the support plate.
  • the piston diaphragm pump shown has a displacement piston 1, which is oscillated back and forth in a piston working space 2 completely filled with hydraulic medium.
  • the membrane 4 arranged between the delivery chamber 3 and the piston working chamber 2 thereby executes a membrane stroke corresponding to the piston stroke volume.
  • the liquid to be pumped flows into the delivery chamber 3 via the suction valve 5 and is expelled via the pressure valve 6 during the pressure stroke.
  • a support plate 7 which, although freely movable, has a security against falling out in the direction of the membrane 4.
  • a plurality of springs 8a which are able to exert pressure on the support plate 7 in the direction against the membrane 4, act on the circumference of the support plate 7.
  • a control tappet 13 also acts, which is provided with a conical recess 13a.
  • the control plunger 13 is under the pressure of a spring 8 with direction of action against the support plate 7.
  • a tumbler 9 engages essentially perpendicularly thereto, which is connected to the closing body 10 of the valve 12 at the opposite end.
  • the length of the tumbler 9 is dimensioned such that the valve 12 is held in its closed position when it contacts the outer region of the circumferential rotation 13a of the control plunger 13. so that no hydraulic medium can flow into the piston working space from the reservoir 11. This is the normal position of the arrangement.
  • the diaphragm 4 reaches the support plate 7 and moves it against the pressure of the springs 8a in the direction of the piston working chamber against the spring-loaded Control plunger 13.
  • the control plunger 13 now resting on the support plate 7 moves in a forced manner against the spring force 8 in the same direction, so that the tumbler 9 slides on the conical circumferential recess 13a of the control plunger 13.
  • the closing body 10 of the refill valve 12 is released.
  • the refill valve 12 opens as a result of the negative pressure prevailing in the piston work chamber and allows hydraulic medium to flow into the piston work chamber from the reservoir 11.
  • the membrane 4 and the support plate 7 move under the pressure of the springs 8 and 8a in the direction of the front space 3.
  • the control plunger 13 is held in engagement with the support plate 7 by the pressure of the spring 8 and accordingly carries out the same movement .
  • the tumbler slides upwards along the conical circumferential recess 13a until it is supported again by the outer circumferential region of the control plunger 13. This in turn locks the closing body 10 in the closed position of the valve 12.
  • the spring shown on the valve 12 only serves to prevent the closing body 10 from falling, but without exerting any significant closing force on the valve.
  • a piston diaphragm pump was thus created which advantageously overcomes the disadvantages mentioned at the outset.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

A piston diaphragm pump includes a support plate, disposed on the side of the piston work chamber, for the diaphragm, which is held in a freely movable manner counter to the pressure of a plurality of springs engaging its circumference. A control push rod under the pressure of another spring, counter to the support plate, engage the circumferential area of the support plate and has a conical recess on its circumference, along which slides a displaceable locking member for a refill valve for the hydraulic fluid during the movement of the control push rod. The refill valve opens only when the support plate displaces the control push rod counter to the pressure of its spring as a consequence of a lack of hydraulic fluid in the pump.

Description

Die Erfindung betrifft eine Kolbenmembranpumpe mit einer der Förder- und den Kolbenarbeitsraum trennenden Membran, die über das den Kolbenarbeitsraum vollständig ausfüllende Hydraulikmedium durch einen in diesem Raum oszillierend hin- und herbewegten Kolben betätigt wird und mit einem Vorratsbehälter für das Hydraulikmedium, der über ein Nachfüllventil mit dem Kolbenarbeitsraum in Verbindung steht, sowie einer unter Federdruck stehenden verschiebbar angeordneten Stützplatte für die Membran, wobei zwischen dem Vorratsbehälter für das hydraulikmedium und dem Kolbenarbeitsraum ein in Richtung gegen den Vorratsbehälter öffnendes Nachfüllventil vorgesehen ist.The invention relates to a piston diaphragm pump with a diaphragm separating the delivery and the piston working space, which is actuated via the hydraulic medium completely filling the piston working space by a piston oscillating back and forth in this space, and with a reservoir for the hydraulic medium, which is provided with a refill valve is in communication with the piston working space, and a spring plate for the diaphragm, which is arranged displaceably under spring pressure, a refill valve opening in the direction towards the storage container being provided between the reservoir for the hydraulic medium and the piston working space.

Diese aus der DE-A-2 843 054 bekannte Kolbenmembranpumpe hat sich als äußerst vorteilhaft erwiesen. Bei Unterdruck im Kolbenarbeitsraum kann sich das Nachtfüllventil erst dann öffnen, wenn die im Saughub zum Kolbenarbeitsraum ausgelenkte Membran die Stützplatte gegen die Federkraft verschiebt und damit das Nachfüllventil zur Öffnung freigibt.This piston diaphragm pump known from DE-A-2 843 054 has proven to be extremely advantageous. In the event of negative pressure in the piston work chamber, the night fill valve can only open when the membrane deflected to the piston work chamber in the suction stroke moves the support plate against the spring force and thus releases the refill valve for opening.

Bei dieser Anordnung ist jedoch mit der Stützplatte ein zentraler Ansatz fest verbunden, der zu einer Anzahl gravierender Nachteile führt. So ist die Anordnung empfindlich gegenüber Verkantungen und Verschmutzungen, die beispielsweise durch Packungsabrieb verursacht werden können. Mit wachsender Baugröße geht gleichzeitig eine Erhöhung der zu beschleunigenden Massen einher, worin ein weiterer Nachteil für den Betrieb der Pumpe zu sehen ist. Der schädliche Raum ist relativ groß und eine Entlüftung erschwert. Schließlich treten infolge des großen Querschnittes des Ansatzes erhöhte Reibungsverluste auf, wodurch die inneren Druckverluste entsprechend hoch sind.In this arrangement, however, a central approach is firmly connected to the support plate, which leads to a number of serious disadvantages. The arrangement is therefore sensitive to canting and contamination, which can be caused, for example, by packing abrasion. With increasing size, there is an increase in the masses to be accelerated, which is another disadvantage for the operation of the pump. The harmful space is relatively large and ventilation is difficult. Finally, due to the large cross-section of the approach, increased friction losses occur, as a result of which the internal pressure losses are correspondingly high.

In Kenntnis dieses Standes der Technik liegt der Erfindung die Aufgabe zugrunde, unter Vermeidung der aufgezeigten Nachteile die Kolbenmembranpumpe der eingangs genannten Art so auszubilden, daß man auch bei wachsender Baugröße mit einem Minimum an zu beschleunigenden Massen auskommt, während gleichzeitig geringere innere Druckverluste auftreten sollen.Knowing this state of the art, the object of the invention, while avoiding the disadvantages shown, is to design the piston diaphragm pump of the type mentioned at the outset in such a way that even with increasing size, a minimum of masses to be accelerated is required, while at the same time lower internal pressure losses should occur.

Gelöst wird diese Aufgabe gemäß der Erfindung dadurch, daß die Stützplatte im Kolbenarbeitsraum in Grenzen frei verschieb- und kippbar angeordnet ist, im Pumpengehäuse ein von der Stützplatte getrennter, auf deren radial äußeren Bereich gerichteter Steuerstößel zwischen einer in Richtung zur Stützplatte hin vorstehenden Sperrstellung und einer demgegenüber axial zurückgeschobenen Freigabestellung verschiebbar geführt ist, gegen den Steuerstößel eine diesen permanent in seine Sperrstellung drängende Feder andrückt und die Stützplatte in der Sperrstellung des Steuerstößels mit einem radial äußeren Bereich gegen den federbelasteten Steuerstößel andrückbar ist, um diesen gegen die anliegende Feder in seine Freigabestellung zu verschieben. Die Stützplatte ist nun frei beweglich und kann sich gegen den Druck der auf den Steuerstößel wirkenden Feder verschieben oder kippen und damit die Nachfüllung auslösen.This object is achieved according to the invention in that the support plate in the piston work space is arranged freely movable and tiltable within limits, in the pump housing a separate from the support plate, directed towards the radially outer region of the control plunger between a protruding position in the direction of the support plate and one on the other hand, axially pushed back release position is guided displaceably, a spring pressing it permanently into its locking position against the control tappet and the support plate in the locked position of the control tappet can be pressed against the spring-loaded control tappet with a radially outer region in order to press it against the spring in its release position move. The support plate is now freely movable and can move or tilt against the pressure of the spring acting on the control tappet and thus trigger the refill.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist für die Arretierung bzw. die Freigabe des Nachfüllventils eine zwischen dem Steuerstößel und dem Ventil angeordnete Zuhaltung vorgesehen. Zweckmäßig weist der Steuerstößel eine konische Umfangseindrehung auf, entlang welcher die Zuhaltung während des Verschiebens des Steuerstößels gleitet. Bei Betätigung liegt der Steuerstößel vorzugsweise an der Stützplatte in deren Umfangsbereich an.According to a preferred embodiment of the invention, a tumbler arranged between the control plunger and the valve is provided for locking or releasing the refill valve. The control plunger expediently has a conical circumferential rotation along which the tumbler slides during the displacement of the control plunger. When actuated, the control plunger preferably abuts the support plate in its peripheral area.

Vorzugsweise ist eine Mehrzahl von Federn vorgesehen, die am Umfang der Stützplatte angreifen.A plurality of springs are preferably provided which engage on the circumference of the support plate.

Weitere Vorteile, Einzelheiten und erfindungswesentliche Merkmale ergeben sich aus der nachfolgenden Beschreibung einer bevorzugten Ausführungsform der Erfindung unter Bezugnahme auf die beigefügte Zeichnung. Diese zeigt einen Schnitt durch die erfindungsgemäße Kolbenmembranpumpe in schematischer Darstellung.Further advantages, details and features essential to the invention result from the following description of a preferred embodiment of the invention with reference to the accompanying drawing. This shows a section through the piston diaphragm pump according to the invention in a schematic representation.

Die dargestellte Kolbenmembranpumpe besitzt einen Verdrängerkolben 1, der oszillierend in einem vollständig mit Hydraulikmedium aufgefüllten Kolbenarbeitsraum 2 hin- und herbewegt wird. Die zwischen dem Förderraum 3 und dem Kolbenarbeitsraum 2 angeordnete Membran 4 führt dadurch einen dem Kolbenhubvolumen entsprechenden Membranhub aus.The piston diaphragm pump shown has a displacement piston 1, which is oscillated back and forth in a piston working space 2 completely filled with hydraulic medium. The membrane 4 arranged between the delivery chamber 3 and the piston working chamber 2 thereby executes a membrane stroke corresponding to the piston stroke volume.

Beim Saughub strömt über das Saugventil 5 die zu fördernde Flüssigkeit in den Förderraum 3 und wird beim Druckhub über das Druckventil 6 ausgestoßen.During the suction stroke, the liquid to be pumped flows into the delivery chamber 3 via the suction valve 5 and is expelled via the pressure valve 6 during the pressure stroke.

Im Kolbenarbeitsraum 2 ist eine Stützplatte 7 vorhanden, die zwar frei beweglich ist, jedoch eine Sicherung gegen das Herausfallen in Richtung auf die Membrane 4 besitzt.In the piston working space 2 there is a support plate 7 which, although freely movable, has a security against falling out in the direction of the membrane 4.

Am Umfang der Stützplatte 7 greift bei der dargestellten Ausführungsform eine Mehrzahl von Federn 8a an, die einen Druck auf die Stützplatte 7 in Richtung gegen die Membran 4 auszuüben vermögen.In the illustrated embodiment, a plurality of springs 8a, which are able to exert pressure on the support plate 7 in the direction against the membrane 4, act on the circumference of the support plate 7.

Im Umfangsbereich der Stützplatte 7 greift außerdem ein Steuerstößel 13 an, der mit einer konischen Eindrehung 13a versehen ist. Der Steuerstößel 13 steht unter dem Druck einer Feder 8 mit Wirkungsrichtung gegen die Stützplatte 7.In the circumferential area of the support plate 7, a control tappet 13 also acts, which is provided with a conical recess 13a. The control plunger 13 is under the pressure of a spring 8 with direction of action against the support plate 7.

Im Bereich der konischen Eindrehung 13a des Steuerstößels 13 greift im wesentlichen senkrecht hierzu eine Zuhaltung 9 an, die mit dem gegenüberliegenden Ende in Verbindung mit dem Schließkörper 10 des Ventils 12 steht. Die Länge der Zuhaltung 9 ist so bemessen, daß bei ihrer Anlage am äußeren Bereich der Umfangseindrehung 13a des Steuerstößels 13 das Ventil 12 in seiner geschlossenen Lage gehalten wird, so daß aus dem Vorratsbehälter 11 kein Hydraulikmedium in den Kolbenarbeitsraum einströmen kann. Es handelt sich hierbei um die Normalstellung der Anordnung.In the area of the conical recess 13a of the control plunger 13, a tumbler 9 engages essentially perpendicularly thereto, which is connected to the closing body 10 of the valve 12 at the opposite end. The length of the tumbler 9 is dimensioned such that the valve 12 is held in its closed position when it contacts the outer region of the circumferential rotation 13a of the control plunger 13. so that no hydraulic medium can flow into the piston working space from the reservoir 11. This is the normal position of the arrangement.

Wenn nach einer gewissen Betriebsdauer die unvermeidlich auftretenden Verluste an Hydraulikmedium dazu führen, daß sich die Membranstellung beim Saughub langsam zum Kolbenarbeitsraum hin verschiebt, erreicht die Membran 4 die Stützplatte 7 und verschiebt sie gegen den Druck der Federn 8a in Richtung auf den Kolbenarbeitsraum gegen den federbelasteten Steuerstößel 13. Der jetzt an der Stützplatte 7 anliegende Steuerstößel 13 bewegt sich zwangsgeführt gegen die Federkraft 8 in die gleiche Richtung, so daß die Zuhaltung 9 an der konischen Umfangseindrehung 13a des Steuerstößels 13 abgleitet. Hierdurch wird der Schließkörper 10 des Nachfüllventils 12 freigegeben. Das Nachfüllventil 12 offnet sich infolge des im Kolbenarbeitsraum herrschenden Unterdrucks und läßt aus dem Vorratsbehälter 11 Hydraulikmedium in den Kolbenarbeitsraum einstromen. Hierdurch bewegen sich die Membran 4 und die Stützplatte 7 unter dem Druck der Federn 8 und 8a wieder in Richtung auf den Forderraum 3. Der Steuerstößel 13 wird durch den Druck der Feder 8 in Eingriff mit der Stützplatte 7 gehalten und führt dementsprechend die gleiche Bewegung aus. Während dieses Bewegungsablaufes gleitet die Zuhaltung entlang der konischen Umfangseindrehung 13a aufwärts, bis sie wieder vom äußeren Umfangsbereich des Steuerstößels 13 abgestützt wird. Hierdurch wird wiederum der Schließkörper 10 in der geschlossenen Stellung des Ventils 12 arretiert.If, after a certain operating time, the inevitable losses of hydraulic medium lead to the diaphragm position slowly shifting towards the piston working chamber during the suction stroke, the diaphragm 4 reaches the support plate 7 and moves it against the pressure of the springs 8a in the direction of the piston working chamber against the spring-loaded Control plunger 13. The control plunger 13 now resting on the support plate 7 moves in a forced manner against the spring force 8 in the same direction, so that the tumbler 9 slides on the conical circumferential recess 13a of the control plunger 13. As a result, the closing body 10 of the refill valve 12 is released. The refill valve 12 opens as a result of the negative pressure prevailing in the piston work chamber and allows hydraulic medium to flow into the piston work chamber from the reservoir 11. As a result, the membrane 4 and the support plate 7 move under the pressure of the springs 8 and 8a in the direction of the front space 3. The control plunger 13 is held in engagement with the support plate 7 by the pressure of the spring 8 and accordingly carries out the same movement . During this sequence of movements, the tumbler slides upwards along the conical circumferential recess 13a until it is supported again by the outer circumferential region of the control plunger 13. This in turn locks the closing body 10 in the closed position of the valve 12.

Die am Ventil 12 dargestellte Feder dient lediglich dazu, ein Herabfallen des Schließkörpers 10 zu verhindern, ohne jedoch eine nennenswerte Schließkraft des Ventils auszuüben.The spring shown on the valve 12 only serves to prevent the closing body 10 from falling, but without exerting any significant closing force on the valve.

Es wurde somit eine Kolbenmembranpumpe geschaffen, die die eingangs aufgezeigten Nachteile in einer vorteilhaften Weise behebt.A piston diaphragm pump was thus created which advantageously overcomes the disadvantages mentioned at the outset.

Claims (5)

1. Diaphragm plunger pump comprising a piston working chamber (2) disposed in the pump housing, separated from a supply chamber (3) by a diaphragm (4) and completely fluid-filled in operating condition, a plunger piston (1) reciprocatingly displaceable therein for producing alternating stroke displacements of the diaphragm (4), a supply container (11) for hydraulic fluid connected with the piston working chamber (2) via a refill valve (12) having a closing body (10) opening in refill flow direction, a support plate (7) for the diaphragm (4) displaceably disposed in the piston working chamber (2), and a tumbler member (9) moveable by the support plate (7), which tumbler is displaceable between a blocking position blocking the closing body (10) of the refill valve (12) against opening thereof, and a release position, in which the refill valve (12) can open under a pressure difference from the supply container (11) to the piston drive chamber (2), characterized in that,
a) the support plate (7) is disposed in the piston work chamber (2) freely displaceable and tiltable between limits,
b) in the pump housing a control rod (13) separate from the support plate and directed towards the radially outward portion thereof is guided displaceably between a blocking position projecting in the direction towards the support plate (7), and a release position displaced axially backwards in relation thereto,
c) a spring (8) presses against the control rod (13) urging same permanently into its blocking position, and
d) the support plate (7) in the blocking position of the control rod (13) is pressable with a radially outward portion against the springloaded control rod (13) to displace same against the abutting spring (8) into its release position.
2. Diaphragm plunger pump according to claim 1, characterized in that the support plate (7) has a crowned circumference.
3. Diaphragm plunger pump according to claim 1 or 2, characterized in that there are provided in addition several support springs (8a) spaced over the circumference of the support plate (7) for staying the radially outward portion thereof during the suction stroke.
4. Diaphragm plunger pumpe according to any one of claims 1 to 3, characterized in that between the closing body (10) of the refill valve (12) and the control rod (13) there is displaceably guided a tumbler member (9) blocking the closing body (10) of the refill valve (12) in the blocking position of the control rod (13) and allowing the opening of the closing body (10) in the release position of the control rod (13).
5. Diaphragm plunger pump according to any one of claims 1 to 4, characterized in that the control rod (13) is provided with a conical circumferential turning (13a), into which the closing body (10) or the tumbler member, respectively, can enter in the release position.
EP82100833A 1982-02-05 1982-02-05 Piston-driven diaphragm pump Expired EP0085725B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8282100833T DE3261319D1 (en) 1982-02-05 1982-02-05 Piston-driven diaphragm pump
EP82100833A EP0085725B1 (en) 1982-02-05 1982-02-05 Piston-driven diaphragm pump
AT82100833T ATE10533T1 (en) 1982-02-05 1982-02-05 PISTON DIAPHRAGM PUMP.
JP57058962A JPS58138286A (en) 1982-02-05 1982-04-08 Piston membrane pump
US06/377,573 US4465438A (en) 1982-02-05 1982-05-12 Piston diaphragm pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82100833A EP0085725B1 (en) 1982-02-05 1982-02-05 Piston-driven diaphragm pump

Publications (2)

Publication Number Publication Date
EP0085725A1 EP0085725A1 (en) 1983-08-17
EP0085725B1 true EP0085725B1 (en) 1984-11-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100833A Expired EP0085725B1 (en) 1982-02-05 1982-02-05 Piston-driven diaphragm pump

Country Status (5)

Country Link
US (1) US4465438A (en)
EP (1) EP0085725B1 (en)
JP (1) JPS58138286A (en)
AT (1) ATE10533T1 (en)
DE (1) DE3261319D1 (en)

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Publication number Priority date Publication date Assignee Title
DE68510C (en) * G. leonhardt in 6 Damrak, Amsterdam Faucet or shut-off valve
FR1168708A (en) * 1957-02-28 1958-12-15 Manuf Comtoise De Decolletage Improvements to diaphragm type gas valves
DE7303301U (en) * 1973-01-30 1974-04-04 Feluwa Schlesiger & Co Kg Diaphragm piston pump
JPS5420410A (en) * 1977-07-15 1979-02-15 Tsuneo Aoki Diaphragm type fluid pressure feeder
DE2843054C2 (en) * 1978-10-03 1983-07-14 Bran & Lübbe GmbH, 2000 Norderstedt Piston diaphragm pump
FR2492473B1 (en) * 1980-10-17 1985-06-28 Milton Roy Dosapro COMPENSATION MEMBRANE PUMP IN THE HYDRAULIC CONTROL CHAMBER

Also Published As

Publication number Publication date
JPS58138286A (en) 1983-08-17
EP0085725A1 (en) 1983-08-17
JPS6358267B2 (en) 1988-11-15
ATE10533T1 (en) 1984-12-15
US4465438A (en) 1984-08-14
DE3261319D1 (en) 1985-01-10

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