WO2003085297A1 - Vanne a manchon a element a pression - Google Patents

Vanne a manchon a element a pression Download PDF

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Publication number
WO2003085297A1
WO2003085297A1 PCT/US2003/009381 US0309381W WO03085297A1 WO 2003085297 A1 WO2003085297 A1 WO 2003085297A1 US 0309381 W US0309381 W US 0309381W WO 03085297 A1 WO03085297 A1 WO 03085297A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
flow
plunger
valve
elastomeric
Prior art date
Application number
PCT/US2003/009381
Other languages
English (en)
Inventor
Joseph C. Dille
Gary E. Pawlas
Original Assignee
Emerson Electric Co.
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 Emerson Electric Co. filed Critical Emerson Electric Co.
Priority to CA002480172A priority Critical patent/CA2480172A1/fr
Priority to KR10-2004-7015517A priority patent/KR20040101376A/ko
Priority to MXPA04009532A priority patent/MXPA04009532A/es
Priority to BR0308897-9A priority patent/BR0308897A/pt
Priority to JP2003582446A priority patent/JP2005521848A/ja
Priority to AU2003220548A priority patent/AU2003220548A1/en
Priority to EP03716861A priority patent/EP1490612A1/fr
Priority to US10/605,385 priority patent/US7104275B2/en
Publication of WO2003085297A1 publication Critical patent/WO2003085297A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
    • F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
    • F16K7/045—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force by electric or magnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
    • F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means

Definitions

  • the present invention relates generally to fluid flow and control, and more particularly, to a pinch valve having a pressure containing member.
  • a fluid delivery system generally consists of three components: fluid propulsion, flow measurement and control, and a user interface.
  • Many industries such as semiconductor, pharmaceutical, and bio-technology experience fluid delivery problems due to the typically low flow rates, the use of abrasive chemical fluids, the use of corrosive chemical fluids, and the need for contaminant free, accurate, compact, s and real-time fluid delivery and/or blending systems.
  • CMP Chemical-Mechanical Planarization
  • a process to flatten the wafer surface of a semiconductor by applying an ultra-pure fluid containing suspended solid particles and a reactive agent between the wafer surface and a polishing pad.
  • the polishing pad rotates at a controlled speed against the semiconductor to flatten the surface.
  • Over-polishing the wafer can result in altering or removing critical wafer structures.
  • under-polishing of the wafer can result in unacceptable wafers.
  • the polishing rate of the wafer is highly dependent upon the delivery rate of the fluid and the total amount of fluid delivered during a polishing operation.
  • photolithography is a process that applies a light sensitive polymer, known as resist, or photo resist, to the wafer surface.
  • a photomask containing a pattern of the structures to be fabricated on the wafer surface is placed between the 0 resist covered wafer and a light source. The light reacts with the resist by either weakening or strengthening the resist polymer.
  • the wafer is developed with the application of fluid chemicals that remove the weakened resist. Accurate and repeatable resist delivery is essential to properly transfer the pattern.
  • the resist must be contamination free as any "dirt" on the surface will cause a defect in the final pattern.
  • a modification of this process applies a host of new liquids to the wafer surface to create films that will become an integral part of the final semiconductor.
  • the primary function of these films is to act as an insulator between electrical conducting wires.
  • a variety of "spin-on" materials are being evaluated with a wide variety of chemical compositions and physical properties. The key difference between the lithography process and the spin-on deposition is that any defect in the film (such as a void, bubble or particle) is now permanently embedded in the structure of the semiconductor and could result in non-functioning devices and a financial loss for the semiconductor producer.
  • the purpose of the track is to apply a precise volume of fluid to the surface of a stationary or slowly spinning wafer. Additional chemical processing steps may be used to convert the liquid to the proper structure. After the liquid application, the wafer rotation speed is rapidly increased and the liquid on the wafer surface is spun off the edge. A very thin, consistent thickness of liquid remains from the center of the wafer to the edge. Some of the variables that affect liquid thickness include the resist or dielectric viscosity, solvent concentration in the resist or dielectric, the amount of resist/dielectric dispensed, speed of dispense, etc.
  • the track will also provide additional processing steps after liquid application that changes the liquid to a polymer using a bake process that also removes any solvent in the film.
  • the track also controls the environment around the wafer to prevent changes in humidity or temperature and chemical contaminants from affecting the performance of the film. Track system performance is determined by the accuracy and repeatability of liquid delivered to the wafer surface in addition to minimizing defects in the film caused by voids, bubbles and particles.
  • the fluid control element is thus a critical component of such systems to insure proper delivery of the process fluids.
  • a control valve in one aspect of the invention, includes an elastomeric flow tube and an actuator having a plunger operatively connected thereto.
  • the plunger is situated adjacent the flow tube and a reference surface is positioned generally opposite the ram such that the elastomeric tube is squeezable between the plunger and the reference surface to control fluid flow through the flow tube.
  • the flow tube material is relatively soft so that it can be compressed between the plunger and reference surface to control the flow. In some instances, the soft flow tube material may have a low pressure rating due to its low strength.
  • a pressure containing member is situated about at least a portion of the flow tube to improve its pressure rating.
  • the pressure containing member may comprise, for example, a braided sleeve, rings, or one or more a rigid members situated about the flow tube.
  • first and second members are sandwiched about the flow tube in a "clamshell" arrangement.
  • a mass flow measurement and control device includes an enclosure, a flow measurement device situated in the enclosure and a pinch valve including an elastomeric flow tube in fluid communication with the flow measurement device.
  • the pinch valve has an actuator with a plunger operatively connected thereto.
  • the plunger is situated adjacent the elastomeric tube, and a reference surface positioned generally opposite the plunger so that the elastomeric tube is squeezable between the plunger and the reference surface.
  • a pressure containing member is situated about at least a portion of the elastomeric tube.
  • the mass flow measurement and control device may further include a controller receiving a measurement output signal from the flow measurement device.
  • the controller provides a control output signal to the pinch valve actuator in response to a setpoint signal and the measurement output signal.
  • the pinch valve is situated in the enclosure.
  • the pinch valve elastomeric tube and the pressure containing member extend outside the enclosure.
  • the pinch valve elastomeric tube may be positioned downstream or upstream of the flow measurement device.
  • Figure 1 is a block diagram schematically illustrating a pinch valve in accordance with an exemplary embodiment of the present invention
  • Figure 2 pictorially illustrates a pinch valve including a braided sleeve pressure containing member in accordance with an embodiment of the invention
  • Figure 3 conceptually illustrates a portion of the pinch valve shown in Figure 3, with a portion of the braided sleeve removed;
  • Figure 4 pictorially illustrates a pinch valve including rings situated about the pinch tube for pressure retention in accordance with another embodiment of the invention
  • Figure 5 pictorially illustrates a pinch valve including a clamshell pressure containing member in accordance with another embodiment of the invention
  • Figure 6 is a perspective view of one portion of the clamshell pressure containing member shown in Figure 5;
  • Figure 7 shows the valve of Figure 5 with a portion of the clamshell pressure containing member removed
  • FIGS 8 and 9 are block diagrams illustrating flow measurement and control devices employing a pinch valve in accordance with an exemplary embodiment of the invention.
  • a pinch valve 100 in accordance with an embodiment of the present invention is conceptually illustrated in Figure 1.
  • An actuator 122 is situated next to an elastomeric tube 126.
  • a valve plunger 124 which may be in the form of a piston or ram, is moved by the actuator 122 to selectively squeeze or pinch the tube 126 against a reference surface 128, thus varying the size of the opening through which fluid flows 129.
  • the flow tube 126 is made of material that is relatively soft so that it can be compressed between the plunger 124 and the reference surface 128 to control the flow. In some instances, the soft flow tube material may have a low pressure rating due to its low strength.
  • a pressure containing member 130 is situated about at least a portion of the tube 126 to improve the pressure rating of the tube 126.
  • Plastics are desirable because the ultra pure chemicals used in the semiconductor wafer fabrication processes can be contaminated if metal ions are leached or removed from metal flow tubes due to a variety of mechanical and chemical processes. Plastic materials are corrosion resistant to a wide range of process materials. High purity grade plastics are thus used in these industries since this generally prevents transferring unwanted ions to the process material. In addition, the smooth surface finish inherent in the manufacturing of a plastic flow tube reduces the ability of bacteria to attach to the tube and contaminate the fluid with organic materials.
  • the tube 126 is preferably made of a high purity elastomer or plastic.
  • a suitable high purity elastomer is silicone (cross-linked polysiloxane) as it is chemically resistant and has the proper chemical properties.
  • Other suitable tubing materials are PVC (polyvinylchloride, Tygon), Polypropylene and Fluorocarbon Rubber (Viton).
  • PVDF polyvinylchloride
  • PTFE Fluorocarbon Rubber
  • a variety of fluorinated polymers such PVDF and PTFE are also suitable.
  • PFA a mixture including PFA materials, and silicone are suitable materials for the tube 126 in high purity applications.
  • the tube's flexibility allows the tubing walls to conform around any trapped particles or imperfections in the walls to provide a tight seal.
  • the flow path is straight through, minimizing pressure drop and turbulence.
  • the fluid contacts only the flow tube 126 preventing wear or corrosion of the other valve parts and preventing contamination of the process fluid in the case of high purity applications, such as semiconductor polishing operations.
  • Figure 2 shows a pinch valve 200 in accordance with an embodiment of the present invention, in which the pressure containing member comprises a braided sleeve 230 surrounding the flow tube 126.
  • the braided sleeve surrounds the entire flow tube 126.
  • Figure 3 schematically illustrates portions of a pinch valve 201, in which a portion 232 of the braided sleeve 230 is removed. In the embodiment illustrated in Figure 3, the removed portion 232 of the sleeve 230 is adjacent the valve plunger 124, so that the valve plunger 124 directly contacts the flow tube 126, rather than the pressure containing sleeve 230.
  • the braided sleeve 230 does not interfere with operation of the valve 201. Certain materials used for the braided sleeve 230, however, may take a permanent set if the valve plunger 126 is pushed against the sleeve material long enough to permanently deform the material. Such a deformed configuration of the sleeve may cause control problems. This type of deformation may occur, for example, with valves having a normally closed configuration, in which the plunger 126 compresses the flow tube 126 and sleeve 230 for long periods of time.
  • Removing the portion 232 of the sleeve 230 in the illustrated location allows the plunger 126 to directly contact the flow tube 126, while maintaining the pressure containing properties of the braided sleeve 230.
  • the sleeve material can be mechanically cut (scissors, cutters, etc.), thermally cut (to prevent unraveling of the material), etc. to achieve the desired opening geometry.
  • the sleeve 230 acts as a "holder" for the tube 126.
  • the sleeve 230 also offers pressure containment for the flow tube 126 and maintains an increased pressure rating of the portion of the flow tube 126 contained within the pinch valve body.
  • Figure 4 illustrates a pinch valve 300 in accordance with another exemplary embodiment of the invention.
  • the pressure containing member comprises a plurality of rings 330 situated about the flow tube 126.
  • 1 mm wide polypropylene rings are spaced on the flow tube 126 on either side of the actuator 122.
  • the pressure containing member comprises one or more rigid members situated about the flow tube 126.
  • the flow tube 126 may be inserted through a bore defined by such a rigid structure to provide pressure containment.
  • the pressure containing member surrounds the flow tube. However, it is not essential that the entire tube be received by the pressure containing member. If more than half of the tube is surrounded, some pressure containment will be realized.
  • FIG 5 shows a pinch valve 400 in accordance with an exemplary embodiment of the present invention that uses a rigid member including two pieces.
  • the pinch valve 400 includes a "clamshell" pressure containing member 430 that includes upper and lower members 431, 432.
  • Figure 6 illustrates the lower member 432; the upper member 431 is similar.
  • Figure 7 shows the valve 400 with only the upper member 431 of the pressure containing member 430 in place.
  • the upper and lower members 431,432 each define a groove 440 that generally corresponds to the shape of the flow tube 126, such that when the upper and lower members 431, 432 are sandwiched about the flow tube 126, the grooves 440 receive the flow tube 126 to provide pressure containment.
  • the upper and lower members 431,432 further define an opening 442 that receives the lower portion of the actuator 122.
  • the upper and lower members 431,432 are held together by any appropriate means to form the pressure containing member 430.
  • the pinch tube 126 did not burst until the pressure exceeded 200 psig.
  • the two-piece clamshell arrangement is exemplary; the rigid pressure containing member may comprise a single member, or several members.
  • pinch valves The actuation of known pinch valves is usually bi-stable - on and off. Some known pinch valves have a manual actuator with a multi-turn handle, but this type of valve would not be conducive to closed loop flow control. Other pinch valves are used for dispensing applications in batch processes, in which the amount of material dispensed is controlled by the time that the valve is on. This does not allow dynamically controlling the flow rate in a continuous manner.
  • a valve that has only two states can be controlled by applying varying current or voltage to the valve actuator.
  • pulse width modulation PWM is used to control the valve.
  • PWM is achieved by generating a square wave signal at a frequency above the valve's mechanical response frequency.
  • the "averaging" takes place because the signal is at a frequency above the valve's mechanical response frequency.
  • the position of the valve is based on the average current that is supplied.
  • the resulting supply voltage is proportional to the pulse width of the signal.
  • a typical pinch valve actuator is a solenoid, which has a spring element with a preload adjustment that determines the current required to close the solenoid. Adjusting the pre-load on the valve spring can improve the valve's control range.
  • the solenoid plunger element is replaced with a spring- suspended plunger. The spring-suspended plunger minimizes the non-linear valve response due to friction, which minimizes the hysteresis and dead band common in available solenoid-actuated pinch valves.
  • An alternative approach to the PWM-controlled solenoid is to use a stepper motor actuator, which translates a controlled, deterministic angular rotation to a linear ram drive by a worm gear type arrangement.
  • Stepper controllers can be designed to produce a specific number of steps proportional to an analog signal input. Backlash, and thus valve hysteresis can be minimized by any number of appropriate worm gear designs that minimize backlash.
  • a stepper motor generally provides immunity to temperature and pressure fluctuations, which may cause changes in the pinch tubing.
  • a stepper motor is a means to control position, so the stepper is immune changes in the pinch tubing.
  • the pinch tube is an integral part of the system - current is applied to the valve actuator, which applies force to the pinch tube, which pinches the tube. If the tube properties change due to temperature or pressure, the amount the tube closes, and thus the flow rate with a solenoid, changes. Moreover, a n __,__. n -,
  • PCT/US03/09381 9 stepper actuator can remain at the last position to provide fast response to achieving setpoint at the start of a fluid delivery cycle.
  • FIGS 8 and 9 schematically illustrate a flow measurement and control device 110 employing a pinch valve 100 in accordance with the present invention.
  • the measurement and control device 110 includes an enclosure 101 having a fluid inlet and outlet 102, 103.
  • a flow measurement device 112 is situated in the enclosure 101.
  • the flow measurement device 112 comprises a Coriolis mass flowmeter.
  • the flowmeter 112 preferably has a flow-tube made of a high-purity plastic material to prevent contamination of the process fluid caused by transferring unwanted (e.g. metal) ions to the process material.
  • Suitable high purity plastic materials include PFN, PVDF and PTFE.
  • the pinch valve 100 may also include components made of a high purity plastic material to prevent transferring ions to the process material.
  • the valve 100 is shown as being situated completely within the enclosure 101. In some embodiments, portions of the valve, or the entire valve, are attached to an outside surface of the enclosure 101, as in the embodiments shown in Figures 2, 4 and 5.
  • a controller 114 receives a setpoint signal and an output signal from the flowmeter 112. The controller 114 conditions and processes the signal from the flow meter and outputs a control signal to the pinch valve 100 to vary the flow rate of the process material based on a comparison of the setpoint and measured flow rate.
  • the setpoint input to the controller 114 is typically an electronic signal such as a 0-5N, 4- 20mA signal or a digital signal.
  • a pneumatic setpoint interface could also be used.
  • a suitable setpoint generator is a model P48 process controller available from Red Lion Controls of York, Pennsylvania.
  • the controller 114 may also have a feature commonly known as valve override, where an additional signal is sent to the controller 114.
  • This override signal causes the controller 114 to ignore the setpoint and fully open or close the valve 100. This feature is often used for shutting the flow off or purging the system.
  • the controller 114 is shown as being positioned inside the enclosure 101, providing a completely integrated flow control system. In other embodiments, however, the controller 114 is external to the enclosure 101.
  • the pinch valve 100 regulates the flow through the device 110, and it also provides a buffer against changes in line pressure.
  • the valve 100 can be positioned either upstream of the mass flowmeter 112 as shown in Figure 8, or downstream as in the embodiment shown in Figure 9. Generally, it is preferable to have the valve 100 on the side that will see the largest pressure variations during use. This helps shelter the flow meter 112 from pressure changes and fluctuations.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Flow Control (AREA)
  • Details Of Valves (AREA)
  • Actuator (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

L'invention concerne une vanne de commande (400) comportant un tube d'écoulement élastomère et un actionneur (122). Un piston, fonctionnellement relié à l'actionneur, est situé contigu au tube d'écoulement. Une surface de référence est placée généralement à l'opposé du piston, le tube élastomère pouvant ainsi être pressé entre le piston et la surface de référence de façon à réguler l'écoulement de liquide traversant le tube d'écoulement. Un élément à pression (430), qui entoure au moins une partie du tube d'écoulement, peut comprendre, par exemple, un manchon tressé, des bagues disposées autour du tube d'écoulement, ou des premier (431) et second (432) éléments de retenue de la pression pris en sandwich autour dudit tube.
PCT/US2003/009381 2002-04-01 2003-03-28 Vanne a manchon a element a pression WO2003085297A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
CA002480172A CA2480172A1 (fr) 2002-04-01 2003-03-28 Vanne a manchon a element a pression
KR10-2004-7015517A KR20040101376A (ko) 2002-04-01 2003-03-28 가압식 수용 부재를 구비하는 핀치 밸브
MXPA04009532A MXPA04009532A (es) 2002-04-01 2003-03-28 Valvula de pellizco con elemento que contiene presion.
BR0308897-9A BR0308897A (pt) 2002-04-01 2003-03-28 Válvula de aperto com elemento contendo pressão
JP2003582446A JP2005521848A (ja) 2002-04-01 2003-03-28 圧力保持体を有するピンチ弁
AU2003220548A AU2003220548A1 (en) 2002-04-01 2003-03-28 Pinch valve with pressure containing member
EP03716861A EP1490612A1 (fr) 2002-04-01 2003-03-28 Vanne a manchon a element a pression
US10/605,385 US7104275B2 (en) 2002-04-01 2003-09-26 Pinch valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36949302P 2002-04-01 2002-04-01
US60/369,493 2002-04-01

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/605,385 Continuation-In-Part US7104275B2 (en) 2002-04-01 2003-09-26 Pinch valve

Publications (1)

Publication Number Publication Date
WO2003085297A1 true WO2003085297A1 (fr) 2003-10-16

Family

ID=28791960

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/009381 WO2003085297A1 (fr) 2002-04-01 2003-03-28 Vanne a manchon a element a pression

Country Status (12)

Country Link
EP (1) EP1490612A1 (fr)
JP (1) JP2005521848A (fr)
KR (1) KR20040101376A (fr)
CN (1) CN1678853A (fr)
AR (1) AR039214A1 (fr)
AU (1) AU2003220548A1 (fr)
BR (1) BR0308897A (fr)
CA (1) CA2480172A1 (fr)
MX (1) MXPA04009532A (fr)
PL (1) PL371376A1 (fr)
RU (1) RU2004131844A (fr)
WO (1) WO2003085297A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017144440A3 (fr) * 2016-02-26 2017-11-09 Ge Healthcare Bio-Sciences Ab Procédé de régulation de pression dans une filtration tangentielle

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7104275B2 (en) * 2002-04-01 2006-09-12 Emerson Electric Co. Pinch valve
US20070131659A1 (en) * 2005-12-09 2007-06-14 Durocher Kevin M Method of making an electronic device cooling system
FR2955119B1 (fr) * 2010-01-13 2012-12-28 Millipore Corp Circuit pour liquide biologique
US20120018654A1 (en) * 2010-07-26 2012-01-26 Jon Peter Wennberg Pinch valves having a multi-piece valve body to receive flexible tubing
CN103161972B (zh) * 2013-03-18 2014-10-15 南京菲恩医疗科技有限公司 一种软管阻断装置
CN106321877A (zh) * 2015-07-03 2017-01-11 东莞市中镓半导体科技有限公司 一种大通道尺寸真空插板阀

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674435A (en) * 1950-03-30 1954-04-06 White S Dental Mfg Co Tube compressor
GB1321199A (en) * 1971-05-12 1973-06-20 Lawjack Equipment Ltd Sleeve for a pinch valve
US5379790A (en) * 1992-01-31 1995-01-10 Suprex Corporation Variable restriction
US6036166A (en) * 1997-09-25 2000-03-14 Imi Cornelius Inc. Chamber valve
US6279869B1 (en) * 1999-11-23 2001-08-28 Tadeusz Olewicz Proportional flow control valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674435A (en) * 1950-03-30 1954-04-06 White S Dental Mfg Co Tube compressor
GB1321199A (en) * 1971-05-12 1973-06-20 Lawjack Equipment Ltd Sleeve for a pinch valve
US5379790A (en) * 1992-01-31 1995-01-10 Suprex Corporation Variable restriction
US6036166A (en) * 1997-09-25 2000-03-14 Imi Cornelius Inc. Chamber valve
US6279869B1 (en) * 1999-11-23 2001-08-28 Tadeusz Olewicz Proportional flow control valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017144440A3 (fr) * 2016-02-26 2017-11-09 Ge Healthcare Bio-Sciences Ab Procédé de régulation de pression dans une filtration tangentielle

Also Published As

Publication number Publication date
AU2003220548A1 (en) 2003-10-20
KR20040101376A (ko) 2004-12-02
BR0308897A (pt) 2005-01-11
EP1490612A1 (fr) 2004-12-29
MXPA04009532A (es) 2005-01-25
AR039214A1 (es) 2005-02-09
JP2005521848A (ja) 2005-07-21
RU2004131844A (ru) 2005-04-27
CN1678853A (zh) 2005-10-05
CA2480172A1 (fr) 2003-10-16
PL371376A1 (en) 2005-06-13

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