US3916931A - Fluid translating device having expansible chambers - Google Patents

Fluid translating device having expansible chambers Download PDF

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Publication number
US3916931A
US3916931A US261593A US26159372A US3916931A US 3916931 A US3916931 A US 3916931A US 261593 A US261593 A US 261593A US 26159372 A US26159372 A US 26159372A US 3916931 A US3916931 A US 3916931A
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US
United States
Prior art keywords
unit
port
ports
units
cylinder
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
US261593A
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English (en)
Inventor
Edwin L Shaw
Everett H Brewer
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.)
PepsiAmericas Inc
Original Assignee
Abex Corp
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 Abex Corp filed Critical Abex Corp
Priority to US261593A priority Critical patent/US3916931A/en
Priority to JP48054048A priority patent/JPS4943225A/ja
Priority to CA172,106A priority patent/CA1007954A/en
Priority to GB2760775A priority patent/GB1438982A/en
Priority to GB2690073A priority patent/GB1438981A/en
Priority to DE2329442A priority patent/DE2329442A1/de
Priority to SE7308183A priority patent/SE400612B/xx
Priority to NL7308009.A priority patent/NL157083B/xx
Priority to IT50679/73A priority patent/IT985416B/it
Priority to CH845473A priority patent/CH573554A5/xx
Priority to FR7321353A priority patent/FR2188075B1/fr
Application granted granted Critical
Publication of US3916931A publication Critical patent/US3916931A/en
Priority to NL7805806A priority patent/NL7805806A/xx
Priority to JP1978083946U priority patent/JPS5455531U/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2514—Self-proportioning flow systems
    • Y10T137/2521—Flow comparison or differential response
    • Y10T137/2524—Flow dividers [e.g., reversely acting controls]
    • 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
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2564—Plural inflows
    • 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
    • Y10T137/86389—Programmer or timer
    • Y10T137/86405—Repeating cycle
    • Y10T137/86413—Self-cycling

Definitions

  • a fluid translating device for a pressure fluid system comprising expansible chamber units, and working members therein, so combined and working in unison as to divide fluid from a source for delivery in equal parts to other sources.
  • the devices When the units are of even number the device is bidirectional in that it will divide flow when flow is in one direction in the fluid system or will combine flow when flow in the same system is in the opposite direction.
  • Each unit e.g., cylinder and piston
  • Each unit e.g., cylinder and piston
  • Each unit has three ports for communicating with a source and two additional ports respectively connected to a port communicating with the expansible chamber of another unit, whereby fluid from a source drives one working member (piston) which itself translates fluid to another source.
  • two units valve each other, and effective ports are switched as a piston moves through a 90 position.
  • This invention relates to self-valving devices which may be used for a variety of applications. These include, but are not limited to, such devices as flow dividers/combiners, transfer units, intensifiers, hydraulic circuit breakers, and flow meters. Aircraft serve a good example of where such devices may be employed; however, in addition to aircraft, other types of vehicles and- /or stationary hydraulic systems may use these devices for similar purposes.
  • Fluid divider/combiner or fluid proportioning devices are known such as US. Pat. No. 2,593,185 where a main stream of entrant fluid is proportioned within internal chambers and delivered to a pair of outlets, utilizing proportional valve means.
  • pressure responsiveness is a very limiting factor, and one object of the present invention is to develop a flow divider/combiner able to divide a main stream of fluid equally between two branches or outlets without in any amounts of fluid to each of the outlet systems. Should the obstruction cause the pressure in one of the outlet systems to reach that of the supply pressure, the unit will stall thus positioning each of the actuators in the outlet system in identical positions.
  • An additional feature of the device is that when in the combining mode,
  • the unit will operate at a speed which is governed by that of the lowest pressure of the two supply sub-systems. Should jamming of an actuator occur, supply to the divider/combiner would be stopped to one side of the divider/combiner. The unit would stall, thus again positioning both actuators in identical positions.
  • hyraulic circuit breakers It may be stated categorically illustration, show preferred embodiments of the present invention and the principles thereof. Other embodiments of the invention employing the same or equivalent principles may be used and structural changes may be made as desired by those schooled in the art without departing from the present invention.
  • FIGS. 1, 1A and 1B are sectional views of a cylinder with the piston thereof in three different positions;
  • FIGS. 2 through 2E are schematic views showingthe sequencing of a two-cylinder bidirectional flow, device in the dividing mode, operating in accordance: with the present invention.
  • FIG. 2F presents a summary of the acting as a flow divider
  • FIG. 3 shows the two cylinder form of a flow meter
  • FIG. 4 shows the two cylinder device modified as a circuit breaker
  • FIG. 5 shows the two cylinder device as unit
  • FIG. 6 is a diagrammatic view showing a six cylinder unit operating in accordance with the present invention.
  • FIGS. 7-71 are diagrammatic views, and FIG. 7.] is a chart, showing operation of a four cylinder arrangement in accordance with the present invention.
  • FIGS. 8, 9, 9A and 10 are schematic views of another four cylinder arrangement
  • FIG. 11 is a schematicview of an eight cylinder arrangement
  • FIG. 12 is a side elevation of a commercial form of GENERAL STATEMENT; GENERAL RULES
  • the devices of the present invention comprisean even number of expansible chamber units having working members therein moving repetitiously between a first and second position. During movement the working member in each unit alternately expands and contracts two expansible chambers, such that as one chamber is being expanded the other or opposite one is being contracted.
  • the expansible chamber units are cylinders and each working member is a reciprocal piston.
  • the piston When at one limit position of an operating cycle defined as 360, which may be taken as the or 360 position, the piston completely contracts a first expansible chamber and completely expands a second expansible chamber; and as the piston moves through a 90 position to a 180 position, the first chamber undergoes expansion as the second chamer is being contracted, the first chamber being completely expanded and the second chamber being completely contracted as the working member attains the 180 position.
  • the piston reverses, moving from the 180 position through a 270 position back to zero, expansion and contraction are reversed.
  • FIG. 1 is a schematic illustration of a cylinder incorporating a piston or spool 16, the piston being located in a first position at one extremity of the cylinder;
  • FIG. 1A shows the same piston in its intermediate position, the center or 90 position;
  • FIG. 1B shows the same piston in the other extremity or 180 position.
  • the cylinder has two expansible end chambers 21 and 22 having ports P affording ingress and egress of fluid under pressure.
  • the piston will be moved as by the admission of pressurized fluid to the left-hand port P, FIG. 1, shifting the piston to its right-hand limit position shown in FIG. 1B.
  • the heads of the piston are afforded by lands 16A and 16BB at the remote ends of the piston. Additionally, the piston includes two intermediate lands 16C and 16D with grooves or reduced areas therebetween, the arrangement being such as to define three interior passages or chambers 20, 23 and 24. The medial one of the passages is at all times in communication with a first port 26 which may be connected to the main stream of fluid S.
  • Passages 23 and 24 are related respectively to second and third ports 23B and 24A. As will be explained, fluid derived from the main source is effectively directed to ports 23B and 24A in the sequence of operation. However, the reverse may prevail in that fluid may be combined for return to the source S.
  • the medial passage 20 at all times is in communication with one or the other of a pair of ports 20-1 and 20-2 allowing direct flow of fluid therebetween in either position.
  • Four lands are shown, but three lands may also be used, as will be described. Regardless, the land edges are such that while the medial passage 20 constantly communicates with the first port 26, neither of the second and third ports is ever in direct communication with the first port 26.
  • the basic unit is preferably a cylinder presenting two opposed expansible chambers, one at each end, and a working member in the form of a piston is disposed therein.
  • the expansible chambers are separated by the end lands on the piston.
  • the expansible chamber unit has a first port 26 which may be connected to a first source of fluid S, and second and third ports 24A, 23B which may be connected to second and third sources of fluid A and B; but these three ports may be used in many different modes.
  • Each expansible chamber unit has a fourth port and a fifth port 20-1; 20-2. Porting and valving are critical.
  • the first, second and third ports of one cylinder always communicate with sources as shown in FIGS.
  • FIG. 1A and 1B respectively communicate with the expansible chambers of another unit as shown in FIG. 1B as will shortly be described for a device consisting of two cylinders so connected, FIG. 2, where the ports are shown by progressive numbers one through five in circles for each cylinder.
  • the invention assumes an even number of expansible chamber units, at least a pair, each unit having first, second and third ports (which may be connected to fluid sources); each unit has a working member (piston) for contracting the expansible chambers and translating fluid to another unit; each unit further having a fourth port to be connected to an expansible chamber of another unit and a fifth port to be connected to an expansible chamber of another unit.
  • Said connections are further characterized in that as a pair of working members alternately assume different positions two expansible chambers are always valved to a first port and an alternate one of the second and third I ports.
  • Cylinder 1 and Cylinder 2 are associated to divide flow or to combine flow. It will be noted that chambers 21 and 22 and passages 20, 23 and 24 of Cylinder 2, FIG. 2, bear the same reference characters as the corresponding parts of the cylinder shown in FIGS. 1 and 1A. Identical chambers incorporated in Cylinder 1 are identified by a 30 series of reference characters. This allows fluid flow to be easily traced.
  • the starting condition is characterized as a random position of the pistons, but is shown as one where each piston is at the extreme left-hand position of the related cylinder.
  • the starting condition can be any position of the pistons within their respective cylinder bores, inasmuch as the first fluid pulse, being a very small amount standing alone, is of no moment especially since the fluid translating device shown in FIG. 2, will be operating over an indefinite period of times when in use to translate a relatively large quantity of fluid between the sources (S on one hand and A and B on the other). This is equally true of the other fluid translating units disclosed herein. (A and B may be assumed as representing hydraulic motors, each to receive an equal volume of operating liquid).
  • the streamof supply fluid to be divided or equalized is delivered to passages 20 and 30 of the cylinders through the respective first ports, one.
  • the source fluid from S introduced to passage 30, Cylinder 1 thus flows from the first port to the fourth port and through related passage 30-1 to the left-hand expansion chamber 21 of Cylinder 2, noting that valving land 16D .of Cylinder] blocks the other line of potentialtransfer 30-2;
  • Fluid underpressure delivered to chamber 20 of Cylinder 2 only; has theeffect of holding the piston of Cylinder l in the'left-hand extreme position shown; valving land 16D of Cylinder 2 blocks flow to passage 20 2 and port five of Cylinder 2.
  • the first shift (see FIG. 2A) is therefore characterized by internal passage of Cylinder 1 servicing the working member or piston of Cylinder 2 in that working fluid under pressure from the source S prevails in chamber 21 of Cylinder 2, driving the piston thereof from left to right resulting in the quantity of fluid in the expansible end chamber 22 of Cylinder 2 being translated to port five and passage 33 of Cylinder 1 and from thence out port three of Cylinder 1 to actuator (source) B.
  • the lands on the piston of Cylinder l valve ports one and four to an expansible chamber of Cylinder 2 while valving the other expansible chamber of Cylinder 2 to ports five and three of Cylinder 1, resulting in delivery of fluid to actuator B.
  • FIG. 2F charts the sequence of flow division.
  • FIGS. 2A and 2B the interior valving means or lands of the piston of Cylinder l are so positioned that passage 30 and expansible chamber 21 are connected until the piston of cylinder 1 reaches its mid position or 90 'position. At this time thej piston of Cylinder 2 has reached its rightmost position, FIG. 213.
  • FIGS. 2B and 2C it can be seen that the piston of Cylinder l valves passage 30 from chamber 21 to chamber 22 and chamber 21 is connected to passage 34.
  • the piston of Cylinder 1 continues to travel to the right, FIG. 2B, while the piston of Cylinder 12 has been reversed and it commences to travel to the left to the position shown in FIG. 2C. Referring to FIGS.
  • the unit must combine or divide accurately as examination will reveal that one end of each piston is ported to one of the A or B ports. As the piston reciprocates, it accepts or delivers first a pulse to one of the ports (A or B) and then to the other port;
  • each cylinder (even number of cylinders) has five essential ports, aside from the openings associated with the expansible chambers thereof, for translating fluid between the device and the system in which it is installed.
  • the passage means and valving means presented by the configured pistons for each unit, connect the first (source) and fourth ports, (the latter in turn being connected at all times to the expansible chamber of another unit) and connect the second (source) port and fifth ports (the latter in turn being connected to the expansible chamber of another unit).
  • the second (source) port and fifth ports (the latter in turn being connected to the expansible chamber of another unit).
  • connections are switched in each unit (and were switched at mid-position of each piston) so that only the first and fifth ports are connected whilst only the third and fourth ports are connected. Consequently, in the even numbered working arrangement of cylinders, a first source port of one unit is alternatively valved by its piston to the fourth and fifth ports of that unit, and the second and third (source) ports of that unit are alternatively valved to the fourth and fifth ports thereof.
  • the fourth and fifth ports are connected to diverse expansible chambers.
  • the first port of one unit is always connected to an expansible chamber of another unit, but the second and third (branch) ports thereof are only alternately connected to an expansible chamber of another unit; and since the two expansible chambers of one unit are respectively connected to the fourth and fifth ports of another unit, it follows that for two successive shifts (one piston, then the other) the fourth and fifth ports of two units (even number) are receiving two unit volumes (2X5) while translating half to A branch and half to B branch.
  • FIG. 2 therefore works in reverse for if A and B are at a pressure higher than S it can be seen that B pressure entering port two of Cylinder 2, FIG. 2, transfers to port five thereof and from thence to expansible chamber 31 causing-jthe piston therein to shift to the right, transfening fluid from chamber 32 to ports four and one of Cylinder 2, returning B to S.
  • the piston of Cylinder I eventually occupies the position shown in FIG. 2C and in moving to, that position valved its port three (A source) to charriber 21 of Cylinder 2 moving the piston of Cylinder 2 tothe right delivering fluid in chamber 22 to the communicated ports five and one of Cylinder l, returning A to S.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Measuring Volume Flow (AREA)
  • Multiple-Way Valves (AREA)
US261593A 1972-06-12 1972-06-12 Fluid translating device having expansible chambers Expired - Lifetime US3916931A (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US261593A US3916931A (en) 1972-06-12 1972-06-12 Fluid translating device having expansible chambers
JP48054048A JPS4943225A (ja) 1972-06-12 1973-05-15
CA172,106A CA1007954A (en) 1972-06-12 1973-05-24 Fluid translating device having expansible chambers
GB2690073A GB1438981A (en) 1972-06-12 1973-06-05 Fluid translating device having expansible chambers
GB2760775A GB1438982A (en) 1972-06-12 1973-06-05 Fluid translating device having expansilbe chambers
SE7308183A SE400612B (sv) 1972-06-12 1973-06-08 Cykliskt paverkbar fluidumoverforingsanordning for ett tryckfluidumsystem
DE2329442A DE2329442A1 (de) 1972-06-12 1973-06-08 Vorrichtung mit ausdehnfaehigen kammern zur uebertragung von stroemungsmedium
NL7308009.A NL157083B (nl) 1972-06-12 1973-06-08 Cyclisch werkende, fluidum onder druk doorleidende inrichting.
IT50679/73A IT985416B (it) 1972-06-12 1973-06-11 Dispositivo di ripartizione con trollata della erogazione di fluido su una molteplicita di sbocchi in particolare per si stemi a fluido pressurizzato
CH845473A CH573554A5 (ja) 1972-06-12 1973-06-12
FR7321353A FR2188075B1 (ja) 1972-06-12 1973-06-12
NL7805806A NL7805806A (nl) 1972-06-12 1978-05-29 Cyclisch werkende inrichting.
JP1978083946U JPS5455531U (ja) 1972-06-12 1978-06-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US261593A US3916931A (en) 1972-06-12 1972-06-12 Fluid translating device having expansible chambers

Publications (1)

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US3916931A true US3916931A (en) 1975-11-04

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Application Number Title Priority Date Filing Date
US261593A Expired - Lifetime US3916931A (en) 1972-06-12 1972-06-12 Fluid translating device having expansible chambers

Country Status (10)

Country Link
US (1) US3916931A (ja)
JP (2) JPS4943225A (ja)
CA (1) CA1007954A (ja)
CH (1) CH573554A5 (ja)
DE (1) DE2329442A1 (ja)
FR (1) FR2188075B1 (ja)
GB (2) GB1438982A (ja)
IT (1) IT985416B (ja)
NL (2) NL157083B (ja)
SE (1) SE400612B (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924900A (en) * 1988-08-02 1990-05-15 Systems Specialties Adjustable ratio mixing valve
US4993262A (en) * 1986-08-28 1991-02-19 Storrar Andrew M Apparatus for monitoring flow of a fluid along a conduit
AU698562B2 (en) * 1994-04-09 1998-10-29 Diverging Lens Company Limited Flow meter
US6227112B1 (en) * 1997-07-30 2001-05-08 Heidelberger Druckmaschinen Aktiengesellschaft Apparatus for performing actuations or operations in a printing press
US20110002802A1 (en) * 2007-12-10 2011-01-06 Medrad, Inc. Continuous fluid delivery system
US20170261009A1 (en) * 2014-09-12 2017-09-14 Lemken Gmbh & Co Kg Hydraulic control device
US10507319B2 (en) 2015-01-09 2019-12-17 Bayer Healthcare Llc Multiple fluid delivery system with multi-use disposable set and features thereof

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220069A (en) * 1975-08-07 1977-02-15 Kanto Seiki Kk Voltage signal circuit for tachometer
BR8201989A (pt) * 1982-04-05 1983-11-16 Woerner Sist Lubrificacao Distribuidor
HU187852B (en) * 1983-02-01 1986-02-28 Danuvia Koezponti Szerszam- Es Keszuelekgyar,Hu Hydraulic current divider/summator for two or more than two loads with control slide valves of unit control edge

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2579670A (en) * 1948-04-02 1951-12-25 Skf Svenska Kullagerfab Ab Hydraulic pressure transformer
US2593185A (en) * 1945-09-26 1952-04-15 Denison Eng Co Flow proportioning apparatus
US2792911A (en) * 1956-07-27 1957-05-21 Trabon Engineering Corp Divisional lubricant feeder
US2834433A (en) * 1954-02-26 1958-05-13 Tanway Ltd Lubricating systems
US3229786A (en) * 1963-11-01 1966-01-18 Trabon Engineering Corp Adjustable feed sequential fluid distribution means

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1230534A (fr) * 1959-03-26 1960-09-16 Georges Martin Ets Perfectionnements apporté aux dispositifs doseurs de graissage central à ligne double
US3476214A (en) * 1968-02-01 1969-11-04 Mccord Corp Divisional lubricant feeder with bypass means
DE7043376U (de) * 1970-11-24 1971-03-18 Schlossbauer A Durchlaufzaehl- und ueberwachungsgeraet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593185A (en) * 1945-09-26 1952-04-15 Denison Eng Co Flow proportioning apparatus
US2579670A (en) * 1948-04-02 1951-12-25 Skf Svenska Kullagerfab Ab Hydraulic pressure transformer
US2834433A (en) * 1954-02-26 1958-05-13 Tanway Ltd Lubricating systems
US2792911A (en) * 1956-07-27 1957-05-21 Trabon Engineering Corp Divisional lubricant feeder
US3229786A (en) * 1963-11-01 1966-01-18 Trabon Engineering Corp Adjustable feed sequential fluid distribution means

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993262A (en) * 1986-08-28 1991-02-19 Storrar Andrew M Apparatus for monitoring flow of a fluid along a conduit
US4924900A (en) * 1988-08-02 1990-05-15 Systems Specialties Adjustable ratio mixing valve
AU698562B2 (en) * 1994-04-09 1998-10-29 Diverging Lens Company Limited Flow meter
US6032528A (en) * 1994-04-09 2000-03-07 Storrar; Andrew Martin Flow meter having cylinders with freely movable pistons therein
US6227112B1 (en) * 1997-07-30 2001-05-08 Heidelberger Druckmaschinen Aktiengesellschaft Apparatus for performing actuations or operations in a printing press
US20110002802A1 (en) * 2007-12-10 2011-01-06 Medrad, Inc. Continuous fluid delivery system
US9057363B2 (en) 2007-12-10 2015-06-16 Bayer Medical Care, Inc. Continuous fluid delivery system
US20170261009A1 (en) * 2014-09-12 2017-09-14 Lemken Gmbh & Co Kg Hydraulic control device
US10507319B2 (en) 2015-01-09 2019-12-17 Bayer Healthcare Llc Multiple fluid delivery system with multi-use disposable set and features thereof
US11491318B2 (en) 2015-01-09 2022-11-08 Bayer Healthcare Llc Multiple fluid delivery system with multi-use disposable set and features thereof

Also Published As

Publication number Publication date
JPS4943225A (ja) 1974-04-23
FR2188075A1 (ja) 1974-01-18
NL157083B (nl) 1978-06-15
CH573554A5 (ja) 1976-03-15
GB1438982A (en) 1976-06-09
NL7308009A (ja) 1973-12-14
NL7805806A (nl) 1978-09-29
CA1007954A (en) 1977-04-05
SE400612B (sv) 1978-04-03
JPS5455531U (ja) 1979-04-17
DE2329442A1 (de) 1973-12-20
FR2188075B1 (ja) 1977-09-09
GB1438981A (en) 1976-06-09
IT985416B (it) 1974-11-30

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