Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
  • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
  • B67D3/00—Apparatus or devices for controlling flow of liquids under gravity from storage containers for dispensing purposes
  • B67D3/04—Liquid-dispensing taps or cocks adapted to seal and open tapping holes of casks, e.g. for beer
  • B67D3/043—Liquid-dispensing taps or cocks adapted to seal and open tapping holes of casks, e.g. for beer with a closing element having a linear movement, in a direction perpendicular to the seat

Definitions

• the present invention relates to a check valve made of plastic, according to the preamble of the patent claim.
• valves are used in particular in the case of liquid containers made from foils, which in turn are placed in cardboard boxes. These packages are known under the name "bag-in-box".
• bag-in-box The advantages of such packaging are the low weight, the good stackability, the avoidance of the empty transport of the emptied containers and the low price compared to the glass containers or metal drums.
• shut-off valve provided on such packaging must be inexpensive to remove the liquid. Therefore, only valves made of plastic come into question, which can also be easily connected, in particular welded, to the film of the container. In addition to diverse, multi-part, complex and costly solutions, there are also a few fold known solutions.
• a rather complicated shut-off valve is shown, for example, in US-A-4,375,862, which is designed as a plug-in valve.
• a flange welded to the plastic tubular bag is stored in the cardboard packaging.
• a plug housing with a central plug opening is sealed in the flange and is closed at the end towards the container with a push-out sealing pin.
• a multi-part plug which snaps into the sealing pin and pushes it into the container, can be inserted into the plug housing. The actual opening or closing position takes place by rotating the plug in the plug housing.
• Such a valve allows only small passage openings and the path between the sealing point and the outlet opening at the end is very long.
• the AU-A-403'943 shows a valve that is particularly simple and consists of a few components.
• the valve body essentially consists of a cylindrical socket with a flange on the inlet side to which the plastic container is connected and a membrane that closes at the end and on the inside of which a valve tappet is arranged.
• a valve plate rests on the valve tappet and, when closed, sits on the valve seat in the valve body lies on. By pushing the flexible membrane, the tappet pushes the valve plate in the valve body away from the valve seat.
• valve plate remains constantly inside the valve body and forms a constant flow obstacle during the opening. If the valve is closed, it drips for a relatively long time until the space behind the valve plate is completely empty.
• Another variant is shown in the same property right, in which the plate is replaced by a linearly displaceable pin with a flow opening. In the closed position, the side wall of the longitudinally displaceable sealing pin lies above the radial outflow opening in the valve body.
• the flow paths are also unfavorable in this solution, and in particular in the second variant, the seal is also extremely questionable.
• check valves made of plastic consist of a valve housing with an inlet port and an outlet opening, which forms the valve seat, and a longitudinally displaceable, movable valve sealing body which. is movable away from the valve seat by means of a valve tappet, the liquid pressure on the side of the valve Valve tappet acts on the valve plate.
• the great advantage of such valves is that the valve sealing body closes the outlet opening directly, since this itself forms the valve seat. Accordingly, there is hardly any dripping of the liquid in such valves.
• US-A-4,471,807 shows a solution to the former problem. Via a deflection mechanism which acts on the valve tappet, a valve plate on the opening on the inlet side is displaced inward away from the latter into the container. This complicates the closure and reduces the flow of the medium.
• FIG. 1 shows an axial, vertical longitudinal section through the assembled valve, the left half representing the fully open position and the right half the fully closed position.
• Figure 2 shows a partial view of the shut-off valve according to Figure 1 in a top view.
• FIG. 3 shows the same representation as in FIG. 1 of a variant of the valve according to the invention, again on one side in the fully open position and on the other hand in the fully closed position.
• FIG. 4 again shows a partial view of the shut-off valve according to FIG. 3 from above.
• FIG. 5 shows a vertical axial section through a sealing body according to the invention, the sealing body having a special internal thread and
• Figure 6 shows the development of this internal thread.
• Figure 7 shows a further vertical section through an assembled valve of another type in the closed and
• the shut-off valve essentially consists of two elements, namely the valve housing 1 and a valve sealing body 2 movable therein.
• the valve housing 1 is closed at the top and the valve sealing body consists of a valve plate and a valve tappet, which seals from the valve housing 1 is led out.
• the valve plate can be lifted upward from the outlet opening, which forms the valve seat, by a tensile force exerted directly or indirectly on the valve tappet.
• the valve housing 1 is identical in construction. It consists of an inlet connector 10 which forms the inlet opening. Means for fastening the housing to the liquid container are provided on the inlet connector 10. These agents are not the subject of the invention and are therefore not shown.
• the attachment can be made consist of a thin-walled flange that directly on the . Liquid container can be welded on.
• the inlet connector 10, which is usually cylindrical, opens into a likewise cylindrical flow-through space 13 of the valve housing 1.
• the flow-through space 13 has a circular outlet opening 11 at the bottom. This outlet opening forms the valve seat 12.
• the flow-through space 13 is likewise completely open towards the top and has a radially projecting annular wall which extends further upwards.
• This radially projecting ring wall 14 is provided with a retaining ring bead 15 at the end.
• An outward-facing, circumferential slide ring bead 16 is arranged below the retaining ring bead.
• the seal ring bead 16 is only interrupted at a few points.
• the slide ring bead 16 is closed at the bottom by a slide ring surface 17 directed radially outwards.
• the valve sealing body 2 projects into the valve housing 1.
• the valve sealing body 2 is shaped here as a sealing piston 22.
• the sealing piston 22 has a flexible sealing flange 23 which is arranged at the top and at the end.
• the flexible flange 23 is provided with a radially limiting retaining ring 24.
• An annular groove 25 is embedded in the retaining ring 24.
• the retaining ring bead 15 fits into the annular groove 25 of the retaining ring 24, on the radially projecting annular wall 14, of the valve housing 1 in a form-fitting manner.
• the sealing piston 22 has a slightly larger diameter as the outlet opening 11 in the valve housing 1.
• the sealing piston 22 is closed at the bottom with a bottom which forms the valve plate 20.
• valve lifter 21 is shaped as a cylindrical wall of the sealing piston 22.
• the valve plate 20 and the valve tappet 21 thus form the valve sealing body 2, which is shaped as a sealing piston 22. If the valve sealing body 2 is moved up and down, the flexible sealing flange 22 follows this movement. In order to be able to carry out these movements on the one hand and to accommodate certain inaccuracies in the area of the outlet opening 11 on the other hand, the valve sealing body 2 is advantageously manufactured entirely from an elastomer.
• a pulling means could be provided to actuate the valve sealing body 2, which would be manually operable.
• an actuating means 3 is provided in the form of a turning handle.
• the twist grip has a cover surface 32, on the underside of which a hollow pin 30 which is open at the bottom is formed.
• the pin 30 is provided with an external thread 31 which engages in an internal thread in the sealing piston 22.
• the outer periphery of the rotary handle forms a vertical jacket wall 33 which is connected to the cover surface 32 via webs 35.
• this vertical jacket wall 33 At the lower end of this vertical jacket wall 33 is an inwardly directed, cross-sectionally hook-shaped slide bead 34 is formed, the exactly radially inwardly directed, in the position of use horizontal slide surface 37 lies exactly on the slide surface 17 of the valve housing 1.
• Passage openings 36 which are only interrupted by the webs 35, are provided between the cover surface 32 drawn obliquely downward in the edge region and the jacket wall 33. These penetration openings allow the parts of the hook-shaped sliding bead 34 projecting inwards to be injection-molded in such a way that no slides are required for this. Since the jacket wall 33 is less flexible in the area of the webs 35, the sliding ring bead 16, the radially projecting ring wall 14 of the valve housing 1, is correspondingly reduced in the corresponding area.
• the actuating means in the form of a twist grip, can be completely or partially screwed to the valve sealing body 2, whereupon the unit, consisting of valve sealing body 2 and actuating means 3, can be pressed directly onto the valve housing 1. Only when the retaining ring bead 15 on the ring wall 14 of the valve housing 1 is pressed completely into the groove 25 of the retaining ring 24 of the valve sealing body 2 can the actuating means 3 be pressed down to such an extent that the hook-shaped sliding bead 34 engages under the sliding ring bead 16 on the radially projecting ring wall 14 can. If you now turn the actuating means 3, this only leads one Rotational movement without translatory part. In contrast, the valve sealing body 2 does not move in the radial direction, but only in the axial direction.
• valve plate 20 Since the valve is only sealed between the valve seat 12 in the valve housing 1 and the cylindrical wall of the valve body, in the form of a sealing piston 22, on the outer periphery, the valve plate 20 could be completely or almost completely eliminated. However, if they are completely omitted, on the one hand liquid can penetrate into the cavity of the sealing piston 22 when the closure is open and this liquid can drip afterwards in the closed state of the closure. It is therefore more advantageous to close the sealing piston 22 at the bottom by means of the valve plate 20. However, this also gives greater strength. The relatively small area of the valve plate 20 is also moistened by the liquid when the valve is used, and although this area is relatively small, the liquid adhering there can subsequently drip off. So that this takes place as soon as possible after the valve has been closed, it has proven to be advantageous to provide a bore 28 in the valve plate 20.
• valve housing 1 has remained unchanged.
• the valve sealing body 2 also shows hardly any changes with regard to the variant Figures 1 and 2 on.
• a radially protruding sealing bead 29 is only provided on the sealing piston 22 on the outer cylindrical wall.
• the internal thread 27 of the sealing piston 22 is specially designed. This can be seen in particular from FIGS. 5 and 6.
• FIG. 5 shows the valve sealing body 2 alone in a vertical axial section and
• FIG. 6 shows the development of this thread.
• the thread has only two threads, each of which has a first threaded section 27 'with a larger pitch angle and a second threaded section 27''with a smaller pitch angle.
• valve sealing body 2 is displaced axially relatively slowly in relation to the rotary movement in the lowest closing or opening area, whereas after a certain opening the complete opening takes place more quickly.
• This also allows the precise, metered delivery of smaller amounts of the liquid from the container.
• the pin 30 of the actuating means 3 can no longer be provided with a complete external thread, since this of course cannot have different thread pitches.
• the external thread on the pin 30 is reduced to two driver elements 31, 31 ', which have two thread sections which are located radially opposite one another and have edge surface sections 38, 38' which run at different inclinations.
• the outer wall 33 of the rotary handle is provided with a border 37 on the outer surface.
• valve sealing body 2 can in turn be moved into the interior of the valve housing 1.
• the means 18 for securing the valve to the container is well shown. It essentially consists of a sealing flange 19 which fits directly into the opening of the container or into a seal attached to it.
• valve body 2 is here in turn shaped as a sealing piston 22, which is closed off by a valve plate 20 with a sealing lip 26 attached at the bottom.
• this sealing piston is now double-walled and no longer has a flexible flange.
• the inner wall 120 extends cylindrically from the upper edge to the sealing plate 20. Viewed from the sealing plate 20, displaced upwards there is a second wall 12 concentrically surrounding the inner wall 120.
• the inner wall 120 of the hollow, cup-shaped sealing piston 22 has axially extending guides 122, for example in the form of slots or grooves, from the upper edge to the point where the inner wall 120 is connected to the outer wall 121.
• the outer wall 121 has a wall compression 123 which is provided with an external thread 124.
• An annular incision 125 in the extension of the outer surface of the outer wall 121 causes the thread to fit radially resiliently and thus also sealingly in an internal thread 141 of the radial annular wall 14 of the valve housing 1.
• the actuating means 3 is designed in the form of a rotary handle which has a pin 30 which is form-fitting in the cylindrical cavity of the sealing piston.
• outward drivers 130 are attached, for example in the form of radial ribs. These fit into the guides 122 and transmit the rotary movement of the handle 3 on the valve sealing body 2, so that it can carry out a combined rotating and translatory movement.
• stops 131 and 132 are provided.
• the seal of this valve can be improved by an annular sealing lip 142 in the valve housing 1, which rests sealingly on the sealing piston.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Check Valves (AREA)
• Closures For Containers (AREA)
• External Artificial Organs (AREA)
• Mechanically-Actuated Valves (AREA)
• Multiple-Way Valves (AREA)
• Pens And Brushes (AREA)
• Lift Valve (AREA)

Applications Claiming Priority (5)

Publications (2)

Family

ID=25688500

Family Applications (1)

Country Status (8)

Families Citing this family (15)

Family Cites Families (19)

• 1994
  • 1994-06-08 JP JP7501158A patent/JPH08500422A/ja active Pending
  • 1994-06-08 ES ES94916123T patent/ES2092906T3/es not_active Expired - Lifetime
  • 1994-06-08 AU AU67924/94A patent/AU6792494A/en not_active Abandoned
  • 1994-06-08 AT AT94916123T patent/ATE142167T1/de not_active IP Right Cessation
  • 1994-06-08 US US08/382,019 patent/US5524864A/en not_active Expired - Fee Related
  • 1994-06-08 DE DE59400593T patent/DE59400593D1/de not_active Expired - Fee Related
  • 1994-06-08 WO PCT/CH1994/000110 patent/WO1994029214A1/fr not_active Ceased
  • 1994-06-08 EP EP94916123A patent/EP0654010B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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