EP0057713A1 - Dispositif de dosage de liquides - Google Patents

Dispositif de dosage de liquides

Info

Publication number
EP0057713A1
EP0057713A1 EP19810902289 EP81902289A EP0057713A1 EP 0057713 A1 EP0057713 A1 EP 0057713A1 EP 19810902289 EP19810902289 EP 19810902289 EP 81902289 A EP81902289 A EP 81902289A EP 0057713 A1 EP0057713 A1 EP 0057713A1
Authority
EP
European Patent Office
Prior art keywords
valve
dosing device
stop
guide
metering
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.)
Withdrawn
Application number
EP19810902289
Other languages
German (de)
English (en)
Inventor
Rolf Tamm
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0057713A1 publication Critical patent/EP0057713A1/fr
Withdrawn legal-status Critical Current

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
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/04—Check valves with guided rigid valve members shaped as balls
    • F16K15/042—Check valves with guided rigid valve members shaped as balls with a plurality of balls
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
    • G01F11/023—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type with provision for varying the stroke of the piston
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/005—Valves

Definitions

  • the invention relates to a metering device for connection to a liquid container, consisting of a valve device with one-way ball valves, at least one of which is held resiliently in the closed position and one of which is an inlet valve which is connected on the inlet side to a riser pipe leading into the liquid container, and the other forms an outlet valve which is connected on the output side to a dispensing device for the metered liquid, and from a metering chamber connected between the inlet valve and the outlet valve to the valve device with a metering piston which can be displaced within the metering chamber for receiving and dispensing precisely measured and adjustable amounts of liquid.
  • a known metering device of this type is placed on a bottle and forms a self-contained one
  • Component with an externally accessible adjustment device with a scale for the dosing piston In a lower part that is not easily accessible from the outside the valve device, wherein the inlet valve in the extension of the riser and the outlet valve, which is connected to a discharge line attached to the lower part, are arranged transversely thereto.
  • the known metering device does not work precisely enough so that even small amounts of liquid, e.g. in the range below 100 ul, to be able to dose with the desired accuracy.
  • liquid e.g. in the range below 100 ul
  • An air cushion between the dosing piston and the liquid surface significantly affects the accuracy of the dosing of small amounts of liquid.
  • the object of the invention is to provide a metering device of the type mentioned, which also allows the metering of small amounts of liquid with sufficient accuracy.
  • this object is achieved in that a valve unit forming the valve device with a T-shaped valve housing, in the arms of which the inlet valve and the outlet valve are inserted in alignment with one another from the ends, and a metering unit releasably connected thereto, which are provided in the trunk of the valve housing formed metering chamber, which is delimited at one end by a connecting part with separate connecting lines to the outlet of the inlet valve and to the inlet of the outlet valve and at the other end by a stop ring of a guide releasably fastened to the stem of the valve housing, and a metering piston biased in the suction direction with a Hubflansch has whose stroke through the stop ring and an adjustable on the guide stop body is determined, and that the metering piston is arranged at a predetermined minimum distance from the connecting part when the lifting flange against the stop ring.
  • the valve unit and the metering unit are arranged transversely to one another, so that the metering piston is no longer at the highest point of the metering device and no air bubbles can collect under the metering piston.
  • the construction of the dosing device from separate valve and dosing units has the advantage that both units can e.g. for maintenance and repair purposes are easily accessible and their function can be easily monitored.
  • the metering unit arranged transversely to the valve unit allows the metering device to be held and actuated only by hand, regardless of a fixed base.
  • the valve housing has opposite, outwardly opening, pot-shaped receptacles for holding bodies with central inner channels for the valve balls, and the
  • Holding bodies are each provided with a recess opposite the valve seats, in which the valve balls are resiliently biased in the closing direction. Thanks to the modular
  • valve balls of both valves are resiliently biased against the valve seats, so that the safe closure of the inlet valve is ensured even when the metering device is not in the vertical position.
  • a plurality of spring bars projecting from the base of the concavity against the valve ball, tapering towards the latter and resting on the surface thereof, and at least between two spring bars are a limitation provided that can be formed in one piece with the holding body.
  • the valve unit in the metering device according to the invention is expediently made of plastic and the plastic is from the group: polyolefins; perfluorinated polyolefins, chlorofluorinated polyolefins selected.
  • the valve seat can consist of an elastic plastic and the valve ball can be made of an abrasion-resistant, non-electrostatically chargeable material. This material can be ruby, sapphire, ceramic or even a corrosion-resistant metal, to which the suspended matter contained in the liquid to be dosed is not retained when it flows through the valve. This ensures that the valve closes securely.
  • the connecting part has a mouth part which extends coaxially into the trunk of the T-shaped valve housing and whose outer diameter corresponds to the inner diameter of the stop ring, and the metering chamber is a glass tube whose width corresponds to the inner diameter of the stop ring and one end of which sealingly abuts the mouth part and the other end of the stop ring.
  • the connecting part can have a viewing window in the region of the mouth part. This creates a dosing chamber that can be constantly monitored for the absence of air from the dosing chamber when the dosing device is being filled and during operation.
  • a cup-shaped, axially adjustable stop body is inserted into a second end of the tubular body forming the guide, the bottom of the recess facing the stop ring facing out axially to the glass tube and to the stop ring Directed breakthrough and the open end of which is provided with an edge part, and between the ring flange of the guide and the edge part is arranged a cross-over the second end of the guide, with one end face of the ring flange.
  • This not only creates an adjustable stroke limitation for the dosing piston by inserting the stop body more or less deeply into the guide, but it also makes it possible to carry out large strokes with the dosing piston. This facilitates the first, air-free filling of the dosing device with the liquid to be dosed and the reliable ventilation during operation, but is advantageous for flushing, for example when changing the liquids.
  • Figure 1 is a partially sectioned overall view of the metering device according to the invention.
  • FIG. 2b shows a central longitudinal section through the outlet valve, in each case in the closed position, in the metering device according to FIG. 1;
  • FIG. 3 shows a central longitudinal section on an enlarged scale through the metering unit in the metering device according to FIG. 1;
  • FIG. 4 shows a plan view of an annular disk in the metering unit according to FIG. 3; 5 shows a central longitudinal section through part of a second exemplary embodiment of the metering unit;
  • FIG. 6 shows a central longitudinal section through part of a third exemplary embodiment of the metering unit
  • Fig. 7 shows a detailed view of the clamping sleeve and the washers in the metering unit
  • FIG. 8 shows a central longitudinal section through part of a fourth exemplary embodiment of the metering unit.
  • FIG. 9 shows a plan view of the circumference of the stop body in the metering unit according to FIG. 8.
  • the overall view of the metering device in FIG. 1 shows a liquid container in the form of a bottle 1, on the mouth of which an attachment in the form of a double sleeve 2 is placed, by means of which the bottle opening is closed and the metering device is held on the bottle 1.
  • the metering device consists of a valve unit 10 and a metering unit 50.
  • the valve unit 10 is connected on the input side to a riser 3, which carries a filter housing 4 with a teflon screen and a steel core 5 at its free end.
  • the riser 3 is passed through a grommet 6 of the filter housing 4.
  • the valve unit 10 is connected to an output line 7 which is fastened to the bottle 1 by a holder 8.
  • the valve unit 10 consists of a generally T-shaped valve housing 1 1 made of Teflon or a chlorofluorinated polyolefin.
  • An inlet valve 1 2 is placed in one arm and an outlet valve 1 3 in the other arm of the valve housing 1 1.
  • a connecting part 1 4 which runs partially transversely thereto, which forms the trunk of the T-shaped valve housing 1 1 and to which the metering unit 50 is connected.
  • the inlet valve 12 consists of a cylindrical, pot-shaped receptacle 15, which is screwed into the internal thread of the free end of the double sleeve 2 with an external thread.
  • a valve seat body 16 is inserted, which abuts an inner annular shoulder 17 of the double sleeve 2 and has a central bore 18.
  • the valve seat body 16 carries a clamp 19 into which the riser 3 is inserted.
  • the valve seat body 16 On the side facing away from the grommet 19, the valve seat body 16 carries a valve seat 20 made of an elastic perfluorinated polyolefin, which can also consist of a polyolefin.
  • the valve seat 20 is supported by a valve ball 21 made of ruby, which can also consist of another abrasion-resistant material that cannot be electrostatically charged, such as sapphire, ceramic or a corrosion-resistant metal.
  • a holding body 22 is inserted flush, which consists of Teflon, but can also consist of chlorofluorinated polyolefin.
  • the structure of the holding body 22 can best be seen in FIG. 2a: The holding body 22 is then provided with a recess 23 opposite the valve seat 20, from the bottom of which a central inner channel 24 extends to the other end of the holding body 22.
  • the outlet valve 13 consists of a cylindrical, cup-shaped receptacle 27, on the bottom of which a valve seat 28 is formed.
  • the valve seat 28 is one
  • the valve seat 28 and the valve ball 29 are made of the same material as the corresponding parts of the inlet valve 12.
  • a holding body 30 is inserted flush into the receptacle 27 and is made of the same material as the holding body 22.
  • the structure of the holding body 30 is best seen in FIG. 2b: Thereafter, the holding body 30 is provided with a recess 31 opposite the valve seat 28, from the bottom of which a central inner channel 32 extends to the other end of the holding body 30. From the bottom of the recess 31, three spring rods 33, which are offset by 120 ° from one another, run in the direction of the valve ball 29 and rest on their surface with elastic deformation with a tapered end. Limiting stops 34 are located between the spring bars 33 and end at a predetermined distance from the valve ball 29. Only one of the spring bars 33 and the limit stops 34 can be seen in the illustration in FIG. 2b. The distance of the
  • Limit stops 34 of the valve ball 29 is selected so that when the valve ball 29 abuts the limiter stop 34 the exhaust valve 13 is fully open and the deformation of the spring rods 33 still remains in the range of the elastic deformation.
  • the spring bars 33 and the limit stops 34 are designed and arranged to each other that they do not hinder the flow from the valve seat 28 to the inner channel 32.
  • the holding body 30 carries a tapered axial shoulder 35 with the formation of an annular shoulder 36.
  • the holding body 30 is in the valve unit by a union nut 37 which engages on the annular shoulder 36 and is guided on an external thread of the receptacle 27 10 supported.
  • the middle part and the trunk of the T-shaped valve housing are formed by a connecting part 14, the middle part of which contains a connecting line 39 starting from the inlet valve 12 and a connecting line 40 starting from the outlet valve 13, cf. in particular Figure 3.
  • the connecting part 14 essentially forms a hollow
  • Pipe section 41 at one end of which a coaxial opening piece 42 is formed, into which the connecting lines 39, 40 open, and at the other end an external thread is provided for connection to the metering unit 50.
  • the pipe section 41 is provided on one side with a viewing window 43 which is formed in the region of the mouth part 42.
  • Dosing unit is one in the trunk of the T-shaped
  • Valve housing 11 formed metering chamber 51 and a
  • the metering chamber 51 is axially delimited by a glass tube 55 made of device glass, the inside diameter of which corresponds to the outside diameter of the mouth part 42 and which is pushed over the mouth part 42 and abuts the connecting part 14 with the interposition of an annular sealing disk 56.
  • the sealing washer 56 is made of a perfluorinated polyolefin which is suitable for sealing glass surfaces and is deformable under mechanical pressure.
  • the glass tube 55 protrudes somewhat beyond the connection part 14 and lies with its end face against a stop ring 57 arranged in the guide 53, the inside diameter of which is adapted to the inside diameter of the glass tube 55.
  • the metering piston 52 consists of a divided piston rod 60.
  • a first part of the piston rod 60 carries at its inner end in the glass tube 55 a piston head 61.
  • the piston head 61 forms in a known manner a tapered end, the steps carrying sealing rings, and is provided with a non-elastic cover which abuts the inner wall of the glass tube 55 with circumferentially extending projections 62.
  • This first part is connected by a screw head 63 to a second, reinforced part of the piston rod 60, and at the transition point between the two parts there is a lifting flange 64 with a centering flange 65 facing the piston head 61 and having a larger diameter than the piston head 61 which protrudes into the stop ring 57.
  • the second part of the piston rod 60 carries an operating button 66 at its outer, again thickened end, which protrudes from the guide 53, and at the transition point to the thickened one
  • An annular shoulder 67 is formed at the end, which serves as an abutment for a spring in a manner to be described.
  • the guide 53 forms a tubular body open on both sides, the first end of which is screwed onto the connecting part 14 of the valve housing 11.
  • An annular shoulder 70 is formed on the inside at the connection point between the first and second ends of the tubular body.
  • the stop ring 57 bil det on the side facing away from the glass tube 55 a raised edge 71 and a central recess 72, the diameter of which is sufficient to accommodate the lifting flange 64 on the piston rod 60.
  • the stop ring 57 has an opening 73 which tapers slightly in the direction of the glass tube 55 and to which the shape of the centering flange 65 connected to the lifting flange 64 is adapted.
  • the guide 53 is screwed with its first end so far onto the connecting part 14 that the stop ring 57 bears on the one hand against the glass tube 55 and on the other hand with its raised edge 71 the ring shoulder 70.
  • the guide 53 On the outside, the guide 53 carries an annular flange 74, which is provided with a recess 75 on the side facing away from the valve unit 10.
  • the stop ring 57 thus forms a fixed stop for the stroke of the metering piston 52.
  • the variable stop for the stroke adjustment is connected to the second end of the guide 53 and is described in detail below.
  • a generally cup-shaped stop body 80 is screwed into the internal thread of the second end of the tubular body.
  • the stop body 80 has an inner width which is adapted to the diameter of the thickened end of the metering piston 52, so that the metering piston 52 is guided therein with its thickened end. Inwardly, the width of the stop body 80 decreases near its bottom 81; the bottom 81 is with a through break 82 provided, the diameter of which corresponds to that of the reinforced second part of the metering piston 52, which is also performed in this area.
  • a spring 83 is supported on the base 81, which engages the annular shoulder 67 of the piston rod 60 and prestresses the metering piston 52 in such a way that the lifting flange 64 is held in contact with the base 81.
  • the stop body 80 is provided with an edge part 84 at its open end. Between the edge part 84 and the ring flange 74 of the guide 53, a clamping sleeve 85 engages over the second end of the guide 53; it rests with its end face on the ring flange 74 and carries at the other end a threaded part 86 with which it is guided on the external thread of the stop body 80. The clamping sleeve 85 is screwed onto the stop body 80 up to an end stop (not shown).
  • the dosing device shown in FIG. 3 is shown in its starting position before a dosing process.
  • An annular disk 87 corresponding to the desired metering quantity is introduced into the recess 75; the stop body 80 is screwed into the second end of the guide 53 with the clamping sleeve 85 screwed onto its thread up to the end stop until the clamping sleeve 85 rests on the annular disk 87.
  • the stroke of the lifting flange 64 of the metering piston 52 in the recess 72 of the stop ring 71 between the bottom 81 of the stop body 80 and the base of the recess 72 is then given by the thickness of the annular disk 87.
  • This stroke distance corresponds to one out of the glass tube 55 displaced amount of liquid, which is indicated by the recess 88 on the annular disc 87.
  • the outlet valve 13 is opened and the set amount of liquid is conveyed through the discharge line 7.
  • the front end of the piston head 61 is at a minimum distance from the connecting part 14, which is predetermined by the depth of the recess 72 in the stop ring 57. This ensures that air bubbles which have entered the liquid column in the region of the valve unit 10 do not collect on the piston head 61 , but are always conveyed through this part of the glass tube 55 and the device 40 to the outlet valve 13.
  • the metering piston 52 returns to the starting position shown in FIG. 3 under the action of the spring 83, the inlet valve 12 opening against the action of the spring bars 25 and the outlet valve 13 under the action of the spring bars 33 (and the pressure difference ) remains closed.
  • the viewing window 43 permits continuous observation and control of the metering process.
  • the stroke of the metering piston 52 can be slightly increased in that the stop body 80 is moved outwards in the second end of the guide 53 while the clamping sleeve 85 is held in place. This adjustment can be made after venting or
  • FIG. 5 shows a second exemplary embodiment of the metering unit 50. Corresponding parts are provided with the same reference symbols. You can see that in the picture Glass tube 55, the metering piston 52 with the piston head 61, the lifting flange 64 and the operating head 66, and the guide 53 with the stop ring 57, the ring flange 74, the stop body 80 and the clamping sleeve 85. In this embodiment, however, the stroke limiting means are not on the Ring flange 74, but arranged between the edge part 84 of the stop body 80 and the threaded part 86 of the clamping sleeve 85.
  • the stroke limiting means are formed here by not completely closed annular disks 90, which can be easily brought over the stop body 80 and are provided on their peripheral surface with an indication of the amount of liquid conveyed.
  • the washers 90 are held between opposite recesses 91 and 92 in the edge part 84 or threaded part 86.
  • FIGS. 6 and 7 A third embodiment of the dosing unit 50 is shown in FIGS. 6 and 7. Corresponding parts are provided with the same reference numerals.
  • the figure shows the glass tube 55, the metering piston 52 with the piston head 61, the lifting flange 64 and the operating head 66, and the guide 53 with the stop ring 57, the ring flange 74, the stop body 80 and the clamping sleeve 85 the stroke limiting means, however, are not arranged on the ring flange 74, but between the edge part 84 of the stop body 80 and the threaded part 86 of the clamping sleeve 85.
  • the stroke limiting means are formed here by not completely closed annular disks 100, which can be easily brought over the stop body 80 and carry a radial projection 101 with a quantity. A plurality of such annular disks 100 can then be arranged offset at an angle to one another, so that the total amount of liquid delivered is always recognizable.
  • the annular discs 100 are provided with holes 102 distributed over their surface, with which they are pushed onto pins 103 protruding from the end face of the threaded part 86.
  • ring washers 105 can be used an engagement groove 106 can be used on one side, in which the pins 103 then engage ( Figure 7).
  • the edge part 84 of the stop body 80 is provided with a corresponding groove 107.
  • FIGS. 8 and 9 A fourth exemplary embodiment of the dosing unit 50 is shown in FIGS. 8 and 9. Corresponding parts are provided with the same reference numerals. One can see in the figure the glass tube 55, the metering piston 52 with the piston head 61, the lifting flange 64 and the operating button 66, and the guide 53 with the stop ring 67 and the ring flange 74. In this embodiment, however, the stop body, the clamping sleeve and the second end of the guide 53 is not screwed together, but the second end of the guide 53 and the stop body 110 are provided with interlocking engagement elements, both of which are locked together in specific, predetermined axial pitches, each of which corresponds to a specific stroke of the metering piston 52.
  • the stop body 110 above the base 111 has three slot combinations consisting of an axial slot 112 and transversely therefrom at certain axial intervals circumferential slots 113 which are offset from one another by an angle of 120 and one of which is shown in a top view in FIG. 9.
  • the second end of the guide 53 carries on its inner wall three pins 114 which are offset from one another by an angle of 120 and which are in engagement with the slot combinations.
  • the stop body 110 can only be axially adjusted relative to the second end of the guide 53 if it assumes such an angular position that the pins 114 are located in the axial slots 112.
  • the clamping sleeve 115 is guided on an external thread of the second end of the guide 53; it has quantities on its circumferential surface; these are made visible by recesses 113 in a guide sleeve 117 which extends from an edge part 116 of the stop body 110 and overlaps the clamping sleeve 115.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

Le dispositif de dosage de liquides fixable a un recipient (1) comprend une unite de soupape (10) avec un corps (11) en forme de T, dont les bras alignes sur les soupapes commandees par des ressorts sont relies a un conduit montant (3) et a un conduit de distribution (7) et dont la tige est formee par une unite de dosage (50). L'unite de dosage (50) comprend une chambre de dosage (51) avec un piston doseur (52), relie par son fond (14) aux soupapes. Le piston doseur (52) est maintenu sorti en fin de course par un ressort (83); il est mobile dans un guide (53) dont une des extremites est vissee sur le fond (14) et dont l'autre extremite porte un poussoir (80, 110) pour le piston doseur (52). La course du piston doseur est fixee par des rondelles (87, 90, 100, 105) agencees sur le guide (53) ou par des elements (112, 113, 114) s'engrenant dans le guide (83) et dans le poussoir (110).
EP19810902289 1980-08-04 1981-07-30 Dispositif de dosage de liquides Withdrawn EP0057713A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803029503 DE3029503C2 (de) 1980-08-04 1980-08-04 Dosiervorrichtung für Flüssigkeiten
DE3029503 1980-08-04

Publications (1)

Publication Number Publication Date
EP0057713A1 true EP0057713A1 (fr) 1982-08-18

Family

ID=6108844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810902289 Withdrawn EP0057713A1 (fr) 1980-08-04 1981-07-30 Dispositif de dosage de liquides

Country Status (3)

Country Link
EP (1) EP0057713A1 (fr)
DE (1) DE3029503C2 (fr)
WO (1) WO1982000516A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202592C2 (de) * 1992-01-30 2000-06-08 Witeg Labortechnik Gmbh Flaschendispenser oder dergleichen mit einem Adapter zur Verbindung mit einer Flasche

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975942A (en) * 1958-12-15 1961-03-21 Sherwin Williams Co Metering dispensing valve
US3768509A (en) * 1971-06-14 1973-10-30 G Goda Liquid check valve assembly
US3771556A (en) * 1971-12-27 1973-11-13 Vernay Laboratories One way check valve
DE7331461U (de) * 1973-08-30 1975-04-24 Brand R Flasche ndispenser
DE2520849A1 (de) * 1975-05-10 1976-11-18 Klaus Stehmer Dosiervorrichtung fuer fluessigkeiten
US4084729A (en) * 1975-08-28 1978-04-18 Maryland Cup Corporation Dispensing valve
US4100935A (en) * 1977-04-28 1978-07-18 Borg-Warner Corporation Check valve for heat pump systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8200516A1 *

Also Published As

Publication number Publication date
DE3029503C2 (de) 1982-12-09
DE3029503A1 (de) 1982-03-04
WO1982000516A1 (fr) 1982-02-18

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