WO1986000599A1

WO1986000599A1 - Valve cap for pressure gas packages

Info

Publication number: WO1986000599A1
Application number: PCT/EP1985/000327
Authority: WO
Inventors: Herbert Meuresch
Original assignee: Deutsche Präzisions-Ventil Gmbh
Priority date: 1984-07-10
Filing date: 1985-07-05
Publication date: 1986-01-30
Also published as: EP0168000A1; DE3425276A1; AU4600485A; ZA855091B

Abstract

A valve cap for pressure gas packages comprises a stamped valve plate (4) made of metal sheet with a collar (6). The collar has a substantially cylindrical inner wall (7) and a substantially cylindrical outer wall segment (8). The collar enables to seize in a functionally appropriate manner the opening edge (3) of a container (2). A terminal segment (17) of the collar (6) comprising the outer stamping surface (18) is inwardly folded at least until it comes approximately at right angles with respect to the cylindrical inner wall. Damages to other valve plates by the stamping edge of the stamping surface are thus prevented.

Description

Valve attachment for compressed gas packs

The invention relates to a valve cap for pressurized gas packs with a valve assembly carrying a stamped sheet metal stamped plate, which has an approximately cylindrical inner wall and an outwardly bent collar, which has an approximately cylindrical outer edge portion and is able to functionally overlap the mouth of a container for pressurized gas packs .

Valve attachments of this type (EU-OS 88 482) are provided with a seal on the inside of the collar, placed on the rim of the mouth of the container and sealed to it by a so-called clinching process.

Valve disks are stamped parts made of sheet steel or aluminum. To protect against the sometimes aggressive contents of the compressed gas packs, the valve parts, like the inner wall of the container itself, are often provided with a protective layer (painting or lamination). In practice it has been shown that these protective layers (on plates and containers) often suffer damage. The protective functions can then no longer be carried out or can only be carried out to a limited extent, which greatly limits the otherwise possible range of use. The invention has for its object to ensure in compressed gas packs made of sheet metal that damage to the protective layers in places where they can come into contact with the product content are largely reduced or virtually eliminated.

This object is achieved according to the invention in that an end section of the collar which has the outer punched edge is bent inwards to such an extent that it is approximately at right angles to the cylindrical inner wall.

This proposal is based on the consideration that the outer edge of each stamped valve plate on

End of the punching surface has a more or less sharp burr. When handling the valve disc, before or after installing the Ventila orcr.ur. , especially in the case of the usual disordered loading in a transport container or hopper, it is almost inevitable that the surface of a plate bearing a protective layer comes into contact with the rough arcing punch burr of another plate. With a relative movement between the two plates, damage by scraping or scratching, etc. is then possible.

The bending of the end section having the outer punched edge results in a smooth, burr-free, annular bead at the free end of the collar.

This is because the punching ridge faces the cylindrical inner wall of the valve plate or the inside of the collar in such a way that no damaging contact with another valve plate is possible.

As a result, scratching, scraping or cutting movements are no longer possible on the surfaces of other plates. The inexpensive sheet metal pressure packs can therefore be used for a large number of aggressive or sensitive filling goods.

The diameter dimensions of the valve plates and the mouth edges of compressed gas pack containers are internationally standardized. If you bend the end section, the inside diameter of the outer wall of the collar becomes smaller. So that the collar is nevertheless able to functionally fit over the mouth edge, it may be necessary to deviate from the standardized dimensions, that is to say, for example, to enlarge the outer diameter of the collar. However, this is not absolutely necessary, as will be explained later.

Bending the end section also has other advantages: plate seals are securely secured against slipping out of the collar during all normal transport movements. In addition, the seating position of such a plate seal is also secured during the filling and closing process, in which high pinch pressures sometimes occur in an uncontrolled manner, because the seal cannot be pressed out of the otherwise usual gap between the collar and the edge of the mouth.

In one embodiment, the end section is bent through approximately 180 °. It then lies practically on the cylindrical outer wall section. At the free end of the collar there is a very evenly rounded bead.

In a preferred embodiment, the end section is only bent by approximately 90 °. This simplifies the bending process. Here, preferably the bent end portion extends only over the area of a slanted ^'erflache to Blechob extending cutting surface. A particularly small reduction in the inside diameter is hereby achieved. The bend of only about 90 ° is even easier to do.

This applies in particular if the punching surface is located on the outside of the end section because, due to the oblique inclination of the punching surface, the bending angle need not be quite 90 °.

Protective caps or the like are often pushed onto the valve plates, with undercuts of the protective caps lying behind the lower edge of the outer collar wall. These undercuts cannot be made to any depth. So that a secure retention of such caps results in spite of the bend, it is recommended that the transition from the cylindrical ^'outer wall portion to the bent end portion has a radius on the outside, and is approximately equal to the sheet thickness is preferably even smaller.

During assembly, the valve plate is inserted into the mouth of the pressure vessel and initially held there loosely, so that the clinch-closing process can then be carried out safely. So that there is a temporary loose mounting of the valve plate, up to now almost exclusively three or more cams projecting outwards have been attached to the cylindrical inner wall of the valve plate, the circumferential circle over the tip of these cams being somewhat larger than the inside diameter of the orifice opening of the Pressure vessel. Despite the overlapping dimensions, it is possible to use the valve disk to press against the resistance of the cams in the mouth opening so that the valve plate is held loosely by the cams from the inner opening edge of the container. Mechanical damage to the protective layers also occurs here in the area of the narrowest point of the mouth opening and in the area of the cams.

This damage to the protective layer can be eliminated according to the invention in that the inner diameter of the bent end section is at most equal to the outer diameter of the mouth edge of the container.

The dimensional overlap required for holding loosely is therefore achieved between the outer wall of the collar and the outer edge of the mouth. Damage to the protective layer is of no importance there, since it is not possible to touch the contents of the container. The circular cross section of the outer wall of the collar is retained since only the bent end section comes into contact with the outer diameter of the mouth edge. Because of this overlap of dimensions, it is even possible to use a standardized mouth rim and a standardized outer diameter of the collar, despite the bending of the stamping burr.

The inner diameter of the end section is expediently 0.2 to 2.0 mm smaller than the outer diameter of the mouth edge. These dimensions take into account the different spring force of the materials and sheet thicknesses used, so that functional assembly is possible.

This means that when using a standardized th container the inner diameter of the bent end portion is at most equal to 31.5 mm. It should preferably be between 29.5 and 31.3 mm.

The invention is explained in more detail below with the aid of a preferred exemplary embodiment shown in the drawing. Show it:

1 shows a longitudinal section through the upper part of a container for a compressed gas pack,

2 shows a longitudinal section through the connection area of the container and valve plate,

Fig. 3 shows schematically two abutting known

Valve disc and

Fig. 4 shows the edge of the valve plate in another embodiment.

A compressed gas pack 1 consists of a container 2, which is provided at the top with a rolled mouth rim 3, and a valve plate 4, which carries a valve arrangement 5 in its center. The valve disk 4 is provided on the outside with a collar 6 which extends over the mouth edge 3.

As illustrated in FIG. 2, the collar has

6, a cylindrical inner wall 7, a cylindrical outer wall section 8 and a bottom 9 which is semicircular in cross section. A seal 10 is placed between the mouth edge 3 and the collar 6, so that the interior of the container is sealed off from the outside when an annular groove 11 shown in broken lines is used in the cylindrical inner wall 7 of the mouth rim 3 against the bottom 9 of the collar 6 is pressed. The valve disk 4 has a continuous protective layer 12. It has been brought into its final shape by several punching and drawing processes. 5

This normally leaves a sharp burr on the outer edge 13 of the valve plate 4 as a result of the punching operation. Such a punched edge of a first valve plate 4a comes with the protective layer

10 12 of a second valve plate 4b in contact, as indicated by the arrows 14 and 15 in Fig. 3, there is damage to the protective layer. This happens, for example, if the valve plate 4 is kept in a disordered manner in a transport container

15 and be transported.

According to the invention, therefore, as shown in FIG. 2, a rounded outer edge 16 is provided, which by bending an end section 17 by approximately 180 ° with respect to FIG

20 the outer wall section 8 has arisen. Here the punching surface 18 producing the sharp punching edge lies at a protected location such that it cannot come into contact with the protective layer of another valve plate. The end section

25 17 is also approximately cylindrical and lies relatively close to the outer wall section 8.

The inside diameter d. Of the end section 17 is somewhat smaller than the outside diameter d "of the mouth

^: 30 randes 3, so that the collar 6 with little

Force can push over the rim 3. An automatic return movement due to the force exerted by the dip tube, for example, is then no longer possible. The difference in diameter can be small

^{■ be} 35. It is preferably in the order of 0.2 to 2 mm _r O. Because of this overlap and Because of the flat flanging, there is a distance a between the inner wall 7 and the outer wall section 8, which does not have to be greater than the distance in the known collars with standardized dimensions.

In the embodiment according to FIG. 4, reference numerals increased by 30 compared to FIG. 2 are used for corresponding parts. The valve disk 34 has a collar 36 with a cylindrical inner wall 37 and a cylindrical outer wall section 38 which, after the punching and drawing operations, has the punched surface 48 'drawn on the outside at an angle to the sheet metal surface.

The bent end section 47 extends almost exclusively to the area of this punching surface, so that this punching surface assumes the fully excellent position 48 after a bend of less than 90 °. In the case of otherwise standardized outer dimensions of the collar and when using a standardized mouth edge, the inner diameter d _{3 should} at most be equal to 31.5 mm, but preferably smaller. So that the undercut of an actuating attachment or a protective cap finds a secure hold, the radius on the outside 49 is smaller than the sheet thickness b.

An annular disk 40 made of elastic material serves as a seal. The bent end section 47 also serves to prevent the inserted washer from falling out during transport movements of the valve plate. In this embodiment too, a film 10 can be used as the seal.

Claims

1.Valve attachment for pressurized gas packs with a valve plate carrying a valve arrangement and stamped from sheet metal, which has an approximately cylindrical inner wall and an outwardly bent collar, which has an approximately cylindrical outer edge section and can functionally overlap the mouth of a container for pressurized gas packs, thereby characterized in that an end section (17; 47) of the collar (6; 96) having the outer stamping surface (18; 48) is bent inwards at least to such an extent that it is approximately at right angles to the cylindrical inner wall (7; 37).

2. Valve attachment according to claim 1, characterized gekenn¬ characterized in that the end portion (17) is bent by about 180 °.

3. Valve attachment according to claim 1, characterized in that the end section (47) only approximately

Is bent 90 °.

4. Valve attachment according to claim 3, characterized gekennzeich¬ net that the bent end portion (47) only over the area of an oblique to

Extends stamping surface (48) extending sheet metal surface. - 1Q -

5. Valve attachment according to claim 4, characterized gekennzeich¬ net that the punching surface (48) is on the Außenensei¬ te of the end portion (47).

6. Valve attachment according to one of claims 1 to 5, characterized in that the transition (49) from the cylindrical outer wall portion (38) to the bent end portion (47) has a radius on the outside which is approximately equal to the sheet thickness (6) and preferably still is smaller.

7. Valve attachment with container according to one of claims 1 to 6, characterized in that the inner by esser (d ₁ ) of the bent end portion

(17) is at most equal to the outer diameter (d _p ) of the mouth edge (3) of the container (2).

8. Valve attachment according to claim 7, characterized gekennzeich¬ net that the inner diameter (d-) of the Endab¬ section (17) is 0.2 to 2.0 mm smaller than the outer diameter (d _? ) Of the mouth edge (3).

Valve attachment according to one of claims 1 to

8, characterized in that the inner diameter

(d .; d3) of the bent end section (17;

47) is at most 31.5 mm.

10. Valve attachment according to claim 9, characterized gekennzeich¬ nneett ,, ddaaßß ddeerr IInnnneenndduurrcchhmmeess; ser (d .; d-) between 29.5 mm and 31.3 mm.