US20180372083A1 - Hydraulic diaphragm control - Google Patents

Hydraulic diaphragm control Download PDF

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Publication number
US20180372083A1
US20180372083A1 US15/630,314 US201715630314A US2018372083A1 US 20180372083 A1 US20180372083 A1 US 20180372083A1 US 201715630314 A US201715630314 A US 201715630314A US 2018372083 A1 US2018372083 A1 US 2018372083A1
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US
United States
Prior art keywords
diaphragm
plunger
sensor
hydraulic
fluid
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.)
Abandoned
Application number
US15/630,314
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English (en)
Inventor
Richard Hembree
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.)
Wanner Engineering Inc
Original Assignee
Wanner Engineering Inc
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 Wanner Engineering Inc filed Critical Wanner Engineering Inc
Priority to US15/630,314 priority Critical patent/US20180372083A1/en
Assigned to WANNER ENGINEERING, INC. reassignment WANNER ENGINEERING, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HEMBREE, RICHARD
Priority to AU2018290227A priority patent/AU2018290227A1/en
Priority to CA3070881A priority patent/CA3070881A1/fr
Priority to SG11202000607XA priority patent/SG11202000607XA/en
Priority to PCT/US2018/038758 priority patent/WO2018237147A1/fr
Publication of US20180372083A1 publication Critical patent/US20180372083A1/en
Abandoned 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
    • 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
    • F04B43/021—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms the plate-like flexible member is pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the plane of the plate-like flexible member and each having its own driving mechanism
    • 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
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • 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
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/06—Valve parameters
    • F04B2201/0601—Opening times
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1208—Angular position of the shaft

Definitions

  • the present invention is directed to a system for controlling a diaphragm in a diaphragm pump using a solenoid valve and to a pump including a system using a solenoid valve to control the diaphragm.
  • Diaphragm pumps are pumps in which the pump fluid is displaced by a diaphragm.
  • the diaphragm In hydraulically driven pumps, the diaphragm is deflected by hydraulic fluid pressure forced against the diaphragm, which acts against the pumped fluid in a reciprocating motion.
  • a plunger moves in a reciprocating manner in a cylinder to act against the hydraulic fluid and force the fluid against the diaphragm.
  • the hydraulic fluid flow is controlled by a system of valves.
  • Such control systems for diaphragm pumps are shown in U.S. Pat. No. 4,665,974 and U.S. Pat. No. 7,425,120.
  • Such a control system has three main valves for each cylinder including a spool valve, a check valve that relieves fluid in an over filled condition, and a check valve utilized for adding fluid in an under filled condition.
  • a spool valve depending on the diaphragm position is utilized for actuation.
  • diaphragm pumps also typically require a fourth valve used as an air bleed valve that allows air to exit the hydraulic chamber such as may occur during priming.
  • valves are relatively costly and require an interrelationship to maintain the proper fluid level and pressure.
  • the pump must be configured with a hydraulic chamber that allows for correct placement and interrelationship of the various valves and their associated fluid conduits.
  • a new and improved pump and control system are needed that eliminate one or more of the hydraulic fluid valves in a diaphragm pump and provide reliable pumping and control at a reduced cost.
  • the reduction in the number of valves and sensors to a single solenoid valve is desirable.
  • the present invention addresses these problems as well as others associated with diaphragm pumps and diaphragm position control.
  • the present invention is directed to a diaphragm pump, and in particular to a diaphragm pump with a control system that utilizes a single valve to control fluid levels in the hydraulic chamber.
  • the diaphragm is driven by a plunger connected to a crankshaft or other drive.
  • the diaphragm includes a non-magnetic rod connecting to an iron rod that is sensed by one or more proximity sensors.
  • the present invention includes a single solenoid valve connected to the hydraulic chamber that controls hydraulic fluid flow into or out of the hydraulic chamber to correct an overfill condition or underfill condition.
  • the plunger may be driven by a crankshaft that may include a proximity sensor sensing indicator lobes of the crankshaft.
  • the plunger may be driven by a lead screw and stepper motor.
  • the iron rod connected to the diaphragm may include a single sensor working in conjunction with sensors on the lobes of the crankshaft or may include two proximity sensors to detect the position of the iron rod and therefore the position of the diaphragm.
  • a linear variable differential transformer accurately detects the position of the iron rod and therefore the position of the diaphragm.
  • the sensors and sensing circuit and/or controller are able to determine whether the plunger has gone beyond top dead center or bottom dead center and whether there is an underfilled condition or an overfilled condition. When this occurs, the single solenoid valve may be opened or closed to correct the underfilled or overfilled condition.
  • the use of multiple sensors eliminates the need for more than one hydraulic fluid control valve.
  • FIG. 1 is a schematic view of a diaphragm pump with a first embodiment of a sensing system
  • FIG. 2 is a logic and wiring diagram for the diaphragm pump shown in FIG. 1 ;
  • FIG. 3 is a crankshaft for a 3 cylinder pump such as the pump shown in FIG. 1 with a sensor and indicator lobes for each cylinder;
  • FIG. 4 is a schematic view of diaphragm pump with a second embodiment of a sensing system
  • FIG. 5 is a schematic view of a diaphragm pump with a third embodiment of a sensing system
  • FIG. 6 is a schematic view of a diaphragm pump with a fourth embodiment of a sensing system
  • FIG. 7 is a schematic view of the diaphragm pump of FIG. 1 with the diaphragm in the bottom dead center (BDC) position;
  • FIG. 8 is a schematic view of the diaphragm pump of FIG. 1 with the diaphragm in the top dead center (TDC) position;
  • FIG. 9 is a schematic view of the diaphragm pump of FIG. 1 with the solenoid open to add fluid to the under-filled hydraulic fluid chamber at BDC;
  • FIG. 10 is a schematic view of the diaphragm pump of FIG. 1 with the solenoid open to dump fluid from the over-filled hydraulic fluid chamber at TDC.
  • the pump ( 100 ) may be a diaphragm pump including a deformable diaphragm ( 102 ).
  • the diaphragm ( 102 ) is deformed to act on pumped fluid in a fluid chamber ( 104 ).
  • Flow into and out of the pumped fluid chamber ( 104 ) is controlled by an inlet check valve ( 106 ) and an outlet check valve ( 108 ).
  • a hydraulic chamber ( 110 ) filled with hydraulic fluid is on the opposite side of the diaphragm ( 102 ).
  • a plunger ( 116 ) reciprocates in a cylinder ( 114 ) to act on the hydraulic fluid, which acts on the diaphragm ( 102 ) to force pumped fluid out as shown in FIG. 10 or to draw pump fluid in as shown in FIG. 9 .
  • the cylinder ( 116 ) is driven by a crankshaft ( 132 ) through a connecting linkage ( 124 ).
  • the pump ( 100 ) also includes a tube ( 112 ) connected to the hydraulic chamber ( 110 ).
  • the tube ( 112 ) is made of a non-metallic material so as not to be affected by magnetics does not affect sensors able to sense magnetic materials.
  • the opposite end of the tube ( 112 ) is closed to complete a hydraulic space.
  • the diaphragm ( 102 ) is connected to a non-metallic rod ( 122 ).
  • An iron rod ( 120 ) mounts to the non-metallic rod ( 122 ) and reciprocates as the diaphragm ( 102 ) is moved outward into the pumping chamber ( 104 ) and retracted back against the hydraulic fluid in the hydraulic fluid chamber ( 110 ).
  • a proximity sensor ( 150 ) is located proximate the tube ( 112 ) so that the sensor ( 150 ) can sense the iron rod ( 120 ) inside the tube ( 112 ).
  • the rod ( 122 ) and the tube ( 112 ) are both made from materials that the sensor ( 150 ) will not detect.
  • the sensor ( 150 ) may be an inductive type sensor able to detect the iron rod ( 120 ) but not the connecting rod ( 122 ).
  • the sensor ( 150 ) is positioned so as to detect the rod ( 120 ) when the diaphragm ( 102 ) is at any position along its normal operating stroke.
  • the sensor ( 150 ) does not detect the iron rod ( 120 ). This information is passed along to a controller ( 142 ).
  • the pump ( 100 ) uses a single solenoid valve ( 140 ) connected to the hydraulic chamber ( 110 ) to control hydraulic fluid flow.
  • the solenoid valve ( 140 ) is near the top of the hydraulic chamber ( 110 ) so that air can exit the hydraulic chamber ( 110 ) through the valve ( 140 ).
  • the other port from the valve ( 140 ) is connected to a fluid sump by tubing ( 118 ).
  • the end of the tubing ( 118 ) should be positioned below the surface of the fluid so that fluid can either exit or enter the tubing ( 118 ).
  • the pump control system also includes a second set of proximity sensors ( 154 ) proximate the crankshaft ( 132 ).
  • the crankshaft ( 132 ) includes lobes ( 134 ).
  • the lobes ( 134 ) are positioned so that when sensed by sensor ( 154 ), the diaphragm is at either top dead center or bottom dead center.
  • the lobes ( 134 ) are positioned so that as soon as the crank passes top dead center or bottom dead center, the sensor ( 154 ) stops detecting the lobes ( 134 ).
  • An embodiment of the crankshaft ( 132 ) is shown in greater detail in FIG. 3 .
  • the crankshaft ( 132 ) includes lobes ( 134 ) for each cylinder in a three cylinder pump.
  • FIG. 2 there is shown a circuit diagram for the control circuit ( 144 ).
  • the control circuit ( 144 ) is connected to the solenoid valve ( 140 ) as well as the proximity sensors ( 150 and 154 ). Switches ( 170 and 172 ) are energized or de-energized by the respective sensor ( 150 or 154 ) to open or close the circuit ( 144 ) and therefore open or close the valve ( 140 ). Simple and reliable control is therefore obtained with the circuit ( 144 ) requiring only two switches ( 170 and 172 ).
  • the control circuit ( 144 ) connects to the proximity sensors ( 150 and 154 ) and to the solenoid valve ( 140 ) and may also connect to a microcontroller ( 142 ). Opening and closing of the solenoid valve ( 140 ) is controlled by the positions detected by the proximity sensors ( 150 and 154 ). It can be appreciated that the relay energized by the sensor ( 150 ) is normally closed so that when the sensor ( 150 ) detects the rod ( 120 ) in normal operation, the circuit ( 144 ) is open.
  • FIG. 4 there is shown a second embodiment of the pump ( 100 ).
  • the pump shown in FIG. 4 is similar to that shown in FIG. 1 but the pump utilizes a linear variable differential transformer (LVDT) to detect the iron rod ( 120 ).
  • the LVDT includes three coils ( 162 ) that surround the fiberglass tube ( 112 ).
  • Use of the LVDT avoids having electrical coils immersed in the fluid of the hydraulic chamber ( 110 ). This configuration also avoids feeding wires into the cycling high pressure of the chamber ( 110 ), which may be difficult and complicated.
  • the LVDT also provides a signal indicating the position of the diaphragm ( 102 ) throughout the stroke and achieves precise timing for opening of the valve ( 140 ).
  • the plunger ( 116 ) is driven by a linear drive ( 182 ) such as a lead screw and a stepper motor ( 180 ) that may be controlled by a controller ( 142 ).
  • a controller 142
  • the microcontroller ( 142 ) knows the position and direction of the plunger from inputs from the stepper motor ( 180 )
  • the microcontroller can therefore infer/determine the proximate position of the diaphragm. Therefore, only one proximity sensor is required to indicate an under-fill or an over-fill condition.
  • the proximity sensor ( 150 ) is placed mid stroke of the iron rod ( 120 ).
  • the sensor ( 150 ) signals the microcontroller ( 142 ).
  • the microcontroller ( 142 ) will open the solenoid valve ( 140 ) at an appropriate time to restore normal operating conditions.
  • the pump ( 100 ) utilizes two proximity sensors ( 150 and 152 ) to detect the position of the diaphragm.
  • the sensor ( 152 ) acts as an under-fill sensor and detects the position of an iron rod ( 120 ).
  • the controller ( 142 ) will be able to determine whether the diaphragm is beyond the top dead center over-filled condition or beyond the bottom dead center under-filled position regardless of the position of the plunger ( 116 ).
  • the two spaced apart proximity sensors ( 150 and 152 ) only the direction of the plunger ( 160 ) is needed rather than the position of the crank ( 132 ) relative to top dead center or bottom dead center.
  • the operation of the solenoid valve operates in four main modes.
  • the logic used to open the solenoid valve ( 140 ) is similar in each of the four embodiments. However, the general operation is described with respect to the embodiment of FIG. 1 even though applicable to the other embodiments.
  • the pump In a first mode, the pump is in a normal operating mode. In a second mode, the pump is in an under-filled operating mode. In a third mode, the pump is in an over-filled operating mode, and in a fourth mode, the pump is in a priming condition.
  • the first mode is shown in FIGS. 7 and 8 . In the first operating mode, the pump ( 100 ) has the correct amount of fluid in the hydraulic chamber ( 110 ).
  • the pump ( 100 ) is shown with the diaphragm ( 102 ) and the plunger ( 116 ) at bottom dead center in FIG. 7 . At this position, the sensor ( 150 ) still detects the rod ( 120 ) so the solenoid valve ( 140 ) remains closed. With the pump ( 100 ) shown with the diaphragm ( 102 ) and the plunger ( 116 ) at top dead center in FIG. 8 , the sensor ( 150 ) detects the iron rod ( 120 ) and the solenoid valve ( 140 ) remains closed.
  • the plunger ( 116 ) is approaching bottom dead center but the diaphragm ( 102 ) has passed beyond the normal bottom dead center and the proximity sensor ( 150 ) is not sensing the rod ( 120 ).
  • the control circuit ( 144 ) opens the solenoid valve ( 140 ).
  • hydraulic fluid is drawn into the hydraulic chamber ( 110 ).
  • the solenoid valve ( 140 ) closes once the sensor ( 154 ) senses that the plunger ( 116 ) has reached bottom dead center and is beginning the forward pressure stroke.
  • the plunger ( 116 ) is approaching top dead center but the diaphragm ( 102 ) has gone beyond the normal top dead center position and the proximity sensor ( 150 ) is not sensing the rod ( 120 ).
  • a microcontroller or the control circuit ( 144 ) opens the solenoid valve ( 140 ).
  • hydraulic fluid is dumped from the hydraulic chamber ( 110 ).
  • the second set of proximity sensors ( 154 ) senses top dead center from the lobes ( 134 ) and shuts the valve ( 140 ) for the suction stroke.
  • the fourth mode takes place when the pump ( 100 ) is first assembled and hydraulic oil needs to be primed into the hydraulic chamber ( 110 ).
  • the solenoid valve ( 140 ) is held open for several strokes by the microcontroller regardless of input from the sensors ( 150 and 154 ) to purge air from the hydraulic chamber ( 110 ). After several strokes, the valve ( 140 ) is closed and depending on which mode the pump is in after the solenoid valve ( 140 ) is closed, the oil level in the hydraulic chamber ( 110 ) will be automatically adjusted by the controller to return to normal.
  • the present invention achieves improved control utilizing sensors to detect the true position of the diaphragm. Control of the fluid levels is accomplished with a single solenoid valve ( 140 ) and eliminates the need for multiple valves associated with the hydraulic chamber as is required with the prior art. The present invention achieves greater reliability and is less expensive and easier to manufacture and maintain.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US15/630,314 2017-06-22 2017-06-22 Hydraulic diaphragm control Abandoned US20180372083A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US15/630,314 US20180372083A1 (en) 2017-06-22 2017-06-22 Hydraulic diaphragm control
AU2018290227A AU2018290227A1 (en) 2017-06-22 2018-06-21 Hydraulic diaphragm control using a solenoid valve
CA3070881A CA3070881A1 (fr) 2017-06-22 2018-06-21 Commande de membrane hydraulique au moyen d'une electrovanne
SG11202000607XA SG11202000607XA (en) 2017-06-22 2018-06-21 Hydraulic diaphragm control using a solenoid valve
PCT/US2018/038758 WO2018237147A1 (fr) 2017-06-22 2018-06-21 Commande de membrane hydraulique au moyen d'une électrovanne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15/630,314 US20180372083A1 (en) 2017-06-22 2017-06-22 Hydraulic diaphragm control

Publications (1)

Publication Number Publication Date
US20180372083A1 true US20180372083A1 (en) 2018-12-27

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ID=62873627

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/630,314 Abandoned US20180372083A1 (en) 2017-06-22 2017-06-22 Hydraulic diaphragm control

Country Status (5)

Country Link
US (1) US20180372083A1 (fr)
AU (1) AU2018290227A1 (fr)
CA (1) CA3070881A1 (fr)
SG (1) SG11202000607XA (fr)
WO (1) WO2018237147A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200309116A1 (en) * 2017-11-22 2020-10-01 Linde Gmbh Method for operating a piston compressor, and piston compressor
US11767840B2 (en) 2021-01-25 2023-09-26 Ingersoll-Rand Industrial U.S. Diaphragm pump

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3767326A (en) * 1972-08-04 1973-10-23 Yarway Corp Volumetric flow control system for pumps
US3961860A (en) * 1971-06-15 1976-06-08 Chemie And Filter Gmbh Proportioning pump
US4436491A (en) * 1978-12-20 1984-03-13 Fuji Photo Film Co., Ltd. Method of supplying hydraulic operating fluid in diaphragm type
DE3320386A1 (de) * 1983-06-06 1984-12-06 Bran & Lübbe GmbH, 2000 Norderstedt Kolben- oder kolbenmembranpumpe
US4828464A (en) * 1987-02-27 1989-05-09 J. Wagner Gmbh Diaphragm pump device
US5056036A (en) * 1989-10-20 1991-10-08 Pulsafeeder, Inc. Computer controlled metering pump
US5165869A (en) * 1991-01-16 1992-11-24 Warren Rupp, Inc. Diaphragm pump
US5433108A (en) * 1992-12-29 1995-07-18 Honda Giken Kogyo Kabushiki Kaisha Crank angle sensor for internal combustion engine and cylinder identification system utilizing the same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541442B1 (fr) 1983-02-17 1988-07-15 Inst Francais Du Petrole Echangeur de chaleur a structure modulaire et son procede de fabrication
DE8801660U1 (de) * 1988-02-10 1988-03-31 Henkel, Wolfgang Eberhard, 6832 Hockenheim Membrandehnungsmeßgerät für Kugelmembranpumpen
US5171129A (en) * 1989-11-14 1992-12-15 Mechanical Technology Incorporated Hydraulically driven reciprocating compressor having a free-floating diaphragm
US5249932A (en) * 1991-10-07 1993-10-05 Erik Van Bork Apparatus for controlling diaphragm extension in a diaphragm metering pump
DE19826610A1 (de) * 1998-06-16 1999-12-23 Bran & Luebbe Membranpumpe und Vorrichtung zur Steuerung derselben
US7425120B2 (en) 2005-04-26 2008-09-16 Wanner Engineering, Inc. Diaphragm position control for hydraulically driven pumps

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961860A (en) * 1971-06-15 1976-06-08 Chemie And Filter Gmbh Proportioning pump
US3767326A (en) * 1972-08-04 1973-10-23 Yarway Corp Volumetric flow control system for pumps
US4436491A (en) * 1978-12-20 1984-03-13 Fuji Photo Film Co., Ltd. Method of supplying hydraulic operating fluid in diaphragm type
DE3320386A1 (de) * 1983-06-06 1984-12-06 Bran & Lübbe GmbH, 2000 Norderstedt Kolben- oder kolbenmembranpumpe
US4828464A (en) * 1987-02-27 1989-05-09 J. Wagner Gmbh Diaphragm pump device
US5056036A (en) * 1989-10-20 1991-10-08 Pulsafeeder, Inc. Computer controlled metering pump
US5165869A (en) * 1991-01-16 1992-11-24 Warren Rupp, Inc. Diaphragm pump
US5433108A (en) * 1992-12-29 1995-07-18 Honda Giken Kogyo Kabushiki Kaisha Crank angle sensor for internal combustion engine and cylinder identification system utilizing the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200309116A1 (en) * 2017-11-22 2020-10-01 Linde Gmbh Method for operating a piston compressor, and piston compressor
US11828281B2 (en) * 2017-11-22 2023-11-28 Linde Gmbh Method for operating a piston compressor, and piston compressor
US11767840B2 (en) 2021-01-25 2023-09-26 Ingersoll-Rand Industrial U.S. Diaphragm pump

Also Published As

Publication number Publication date
CA3070881A1 (fr) 2018-12-27
SG11202000607XA (en) 2020-02-27
AU2018290227A1 (en) 2020-02-13
WO2018237147A1 (fr) 2018-12-27

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