EP0920359A1

EP0920359A1 - Valve and method for producing a valve seat for a valve

Info

Publication number: EP0920359A1
Application number: EP98931957A
Authority: EP
Inventors: Wilhelm Hopf; Dieter Holz
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1997-06-25
Filing date: 1998-04-21
Publication date: 1999-06-09
Anticipated expiration: 2018-04-21
Also published as: DE19726991A1; WO1999000201A1; BR9806007A; AU724749B2; US6173914B1; JP2001500213A; KR20000068314A; KR100497268B1; AU8206398A; DE59803184D1; EP0920359B1

Abstract

The valve provided for in the invention is characterized in that it comprises a perforated disk (16) having at least two metallic sheet layers (20) contacting each other in a sandwich-like manner. Said perforated disk (16) comprises at least one floor area (22) having an opening geometry (23) required for injecting the medium and a seat area (24) with a valve seat surface (25) in such a way that the functions of the valve seat and the perforated disk are combined in one laminated sheet element. The invention also provides for a method for producing a valve seat for such a valve from metal sheets arranged in a sandwich-like manner. Said valve is especially suited for use in fuel injection units of spark-ignited internal combustion engines with mixture compression.

Description

Valve and method for manufacturing a valve seat for a valve

State of the art

The invention relates to a valve according to the preamble of claim 1 and a method for producing a valve seat for a valve according to the preamble of claim 13 and claim 14.

From DE-OS 42 21 185 an injection valve for injecting fuel into an intake manifold is already known, in which the valve seat body is produced by means of a machining process. The valve seat body must be subjected to a subsequent fine machining in the area of the valve seat after the machining preprocessing in order to achieve the accuracy required for the sealing function when interacting with a spherical valve closing body. On the downstream end face of the valve seat body, a separately manufactured spray orifice plate is sealingly connected by welding. The heat exposure during welding can disadvantageously lead to an undesirable deformation of the Guide the spray hole disc. For this two-part valve seat part, two components have to be produced separately from one another, which are only connected to one another subsequently and possibly still have to be reworked, which overall leads to a relatively high production outlay.

Advantages of the invention

The valve according to the invention with the characteristic

Features of claim 1 has the advantage that the valve seat and perforated disk function are integrated in a simple manner in a single component, such a perforated disk element being particularly simple, inexpensive and material-saving to produce by mass production of large quantities. The design of the perforated disc element with several functional areas as a sheet metal laminate element not only leads to easy workability and low weight due to the reduction in the number of components, but also to a reduction in the material requirement. In addition, there is no need for connections between the valve seat body and the perforated disk, such as weld seams, which saves material and time and avoids sealing problems.

The multi-layer structure of the perforated disc element made of sandwich-like sheets allows the opening geometry to be designed in such a way that even, very fine atomization of the medium to be sprayed off is achieved without additional energy, a particularly high level

Atomization quality and a beam shaping adapted to the respective requirements is achieved. Especially An S stroke is advantageously achieved in the flow of the medium, for example a fuel.

Advantageous further developments and improvements of the valve specified in claim 1 are possible through the measures listed in the subclaims.

The perforated disk element advantageously has functional areas for spraying off the medium and influencing its flow (bottom area), for opening and

Closing the valve (seat area), for guiding the axially movable valve closing body (guide area) and for fastening in the valve (holding area). A large number of functions are therefore performed by a single valve component.

The S-blow in the flow achieved by the geometrical arrangement of the opening geometry (offset of spray openings to the inlet opening) allows the formation of bizarre jet shapes with a high atomization quality. The perforated disc elements allow for one, two and

Multi-jet sprays Cross-sections in countless variants, such as B. rectangles, triangles, crosses, ellipses. Such unusual beam shapes allow an exact optimal adaptation to given geometries, e.g. B. to different intake manifold cross sections of internal combustion engines. This results in the advantages of a shape-adapted utilization of the available cross-section for the homogeneously distributed, exhaust-reducing mixture introduction and the avoidance of emissions-harmful wall film deposits on the intake manifold wall. With such a valve, the exhaust gas emission of the internal combustion engine can consequently be reduced and the fuel consumption can also be reduced. In general, it can be stated as a very important advantage of the valve according to the invention that jet pattern variations are possible in a simple manner.

It is particularly advantageous to provide flow openings in the guide region of the perforated disk element, so that an unimpeded flow of the medium in the direction of the valve seat is made possible. Advantageously, these flow openings have an orientation such that a medium flowing through them is subject to swirl.

The method according to the invention for the production of a valve seat for a valve with the characterizing features of claims 13 and 14 have the advantage that multilayer perforated disk elements made of metal can be produced very effectively and in large numbers at low cost through their use in a simple manner (line production). In a particularly advantageous manner, a simple and inexpensive location assignment of individual sheet foils or the sheet layers of the later one is possible

Perforated disk elements realized through auxiliary openings, so that there is a very high level of manufacturing reliability. In a preferred manner, the sheet metal foils can be assigned automatically via optical scanning and image evaluation. On machines and machines provided for the production of multi-layer perforated disk elements, the material, the sheet thickness, the desired opening geometries and other parameters can be ideally adapted for the respective application. Advantageously, the blanks, which are initially in a band and later separated, are reshaped in such a way that perforated disk elements are formed which have at least one base region with the opening geometry and one seat region with a valve seat surface. The perforated disk elements comprising several sheet metal layers thus combine valve seat and perforated disk functions in one component each.

It is particularly advantageous to provide the sheet metal foils in the form of foil strips or foil carpets for further processing.

Advantageous further developments and improvements of the method specified in claims 13 and 14 are possible through the measures listed in the subclaims.

Welding, soldering or gluing in all of their different forms of application ideally serve as an optional joining method for connecting several sheet metal foils inside or outside the circular blanks.

The blanks are separated in a particularly advantageous manner with a cutting tool of a deep-drawing tool, in which the blanks are also shaped into cup-shaped perforated disk elements.

The sheet metal layer of the seat area of the perforated disk element facing the valve closing body is hardened in an advantageous manner. drawing

Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows a partially illustrated injection valve with a first perforated disk element according to the invention, FIG. 2 shows a schematic diagram of the process sequence for producing a perforated disk element, and FIG. 3 shows an exemplary embodiment of a film strip for a later sheet metal layer

Perforated disk element, FIGS. 4 and 5, in detail, two examples of perforated disk elements with differently shaped holding areas, FIGS. 6 to 8 a deep-drawing tool with a band to be processed in different processing stages, FIG. 9 schematically, a chronological sequence when forming a circular blank into a perforated disk element, a two-layer perforated disk element and FIG. 11 shows a second example of a two-layer perforated disk element.

Description of the embodiments

In FIG. 1, a valve in the form of an injection valve for fuel injection systems of mixture-compressing spark-ignition internal combustion engines is partially shown as an exemplary embodiment. The injection valve has a tubular valve seat support 1, in which a longitudinal opening 3 is formed concentrically with a valve longitudinal axis 2. In the longitudinal opening 3 is a z. B. tubular valve needle 5 arranged at its downstream end 6 with a z. B. spherical valve closing body 7 is connected. The injection valve is actuated in a known manner, for example electromagnetically. An indicated electromagnetic circuit with a magnet coil 10, an armature 11 and a core 12 serves for the axial movement of the valve needle 5 and thus for opening against the spring force of a return spring (not shown) or closing the injection valve. The armature 11 is facing away from the valve closing body 7 End of the valve needle 5 by z. B. one produced by means of a laser

Connected weld and aligned to the core 12.

A guide opening 15 of a perforated disk element 16 is used to guide the valve closing body 7 during the axial movement. The perforated disk element 16 is tightly mounted by welding in the downstream end of the valve seat carrier 1, which is remote from the core 12, in the longitudinal opening 3 which is concentric with the longitudinal axis 2 of the valve. The perforated disk element 16 represents a combination of a perforated disk and a valve seat body of conventional valves, in particular fuel injection valves, and thus simultaneously fulfills the functions of both components that are otherwise used. The perforated disc element 16 is made of at least two, in the exemplary embodiment according to FIG. 1, three metal ones having a small thickness

Sheet metal layers 20 are formed so that there is a so-called laminated perforated disk which also functions as a valve seat.

The perforated disk element 16 is produced from a plurality of flat sheet metal foils which are deformed, for example by deep drawing or cups, in such a way that differently oriented regions of the perforated disk element 16 arise. For example, the perforated disk element 16 has at least a central base region 22 with a desired opening geometry 23, a seat region 24 which adjoins radially outward with an inner valve seat surface 25, a subsequent guide region 26 with the inner guide opening 15 and an outer holding region 28 which forms the radial closure on. Between the guide area 26 and the holding area 28, a connection area 30 can optionally be provided, which, for example, runs parallel to the bottom area 22 and perpendicular to the longitudinal axis 2 of the valve, as in FIG. Except for the bottom area 22, all other areas 24, 26, 30, 28 run in a ring around the valve closing body 7. The slightly conically bent outward holding area 28 exerts a radial spring effect on the wall of the longitudinal opening 3. As a result, chip formation at the longitudinal opening 3 is avoided when the perforated disk element 16 is inserted into the longitudinal opening 3 of the valve seat carrier 1. The holding area 28 of the perforated disk element 16 is connected at its free end to the wall of the longitudinal opening 3, for example by a circumferential and tight weld seam 32. The tight welding prevents fuel from flowing through the longitudinal opening 3 directly into an intake line of the internal combustion engine.

The insertion depth of the perforated disk element 16 serving as the valve seat part into the longitudinal opening 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 when the magnet coil 10 is not energized due to the valve closing body 7 resting against the valve

Valve seat 25 of the seat area 24 is fixed. The other end position of the valve needle 5 is when excited Magnetic coil 10 is fixed, for example, by the armature 11 bearing against the core 12. The path between these two end positions of the valve needle 5 thus represents the stroke.

The spherical valve closing body 7 interacts with the valve seat surface 25 of the seat area 24 of the perforated disk element 16 which tapers in the shape of a truncated cone and is formed in the axial direction between the guide area 26 and the base area 22. The guide area 26, the seat area 24 and the bottom area 22 together form an inner pot of the perforated disk element 16, which largely receives and encloses the spherical valve closing body 7.

FIG. 2 shows a basic diagram of the process sequence in the production of a perforated disk element 16 according to the invention, the individual production and processing stations being shown only symbolically. Individual processing steps are explained in more detail with the aid of the following figures. In the first station, denoted by A, there are sheet metal foils corresponding to the desired number of sheet metal layers 20 of the later perforated disk element 16 as, for example, rolled-up foil strips 35. When using three film strips 35a, 35b and 35c for the production of a three sheet layers 20 comprising

Sheet metal laminated perforated disk element 16, for later processing, especially when joining, is expedient to coat the middle film strip 35b. In the film strips 35, a large number of identical opening geometries 23 per film strip 35 and

Auxiliary openings 54, 55 (Figure 3) for centering and adjusting the film strips 35 or for later exposure of the Perforated disk elements 16 introduced from the film strip 35.

This processing of the individual film strips 35 takes place in station B. In station B, tools 36 are provided, with which the desired opening geometries 23 and the auxiliary openings 54, 55 are formed in the individual film strips 35. All essential contours are produced by micro punching, laser cutting, eroding, etching or comparable processes. In addition to the opening geometries 23 and the auxiliary openings 54, 55, flow openings 50 (FIG. 3) are also introduced into the upper film strip 35a. FIG. 3 illustrates an example of a film strip 35a processed in this way. The film strips 35 pass through the station C, which is a heating device 37 in which the film strips 35 are inductively heated, for example in preparation for a soldering process. Station C is only provided as an option, since at any time others, one

Heating methods not required for connecting the foil strips 35 can be used.

In station D, the individual film strips 35 are joined to one another, the film strips 35 being positioned exactly with respect to one another by means of centering devices and being pressed together and transported, for example by rotating pressure rollers 38. A centering device (index pins, index bolts), which is not shown, engages in the auxiliary openings 54 and ensures that the round plates 58 of the individual film strips 35 are dimensionally accurate and one above the other brought before the film strips 35 are connected together. Laser welding, light beam welding, electron beam welding, ultrasonic welding, pressure welding, induction soldering, laser beam soldering, electron beam soldering, gluing or other known processes can be used as joining processes. The fixed connections of the film strips 35 can be made both inside the round plates 58 (eg in the area of the later seating area 24) and outside the round plates 58 near the film edges 56 or in central areas of the band 39 between two opposite auxiliary openings 54.

Subsequently, the band 39 comprising a plurality of layers of film strips 35 is processed in station E in such a way that perforated disk elements 16 are of the size and contour desired for installation in the injection valve. The station E also separates the perforated disk elements 16, for example by punching them out of the band 39 or by tearing them off in a tool 40, in particular a deep-drawing tool. The

Perforated disk elements 16 are separated from the band 39, for example by tearing, and are thus separated, the perforated disk elements 16 at the same time being provided directly with a pot-shaped shape. If punching out is carried out differently than in a deep-drawing tool, deep-drawing or cuping is still required after punching out.

The perforated disk elements 16 are subsequently installed in the valve seat support 1. The perforated disk elements 16 are made with the aid of a joining device (not shown) attached, a laser welding device is advantageously used to achieve a firm and tight connection.

FIG. 3 shows a specific exemplary embodiment of a film strip 35a for a perforated disk element 16. The film strip 35a represents the upper sheet metal layer 20a which will later face the valve closing body 7. Usually, two to five film strips 35, each with a thickness, are arranged one above the other for the sheet metal laminate perforated disk elements 16 from 0.05 mm to 0.3 mm, in particular approximately 0.1 mm. Each film strip 35 is provided in station B with an opening geometry 23 which is repeated in large numbers over the length of the film strips 35. In the embodiment shown in Figure 3, the upper one

Film strips 35a have an opening geometry 23 in the form of a double H-shaped inlet opening 23a. At the same time, openings, such as passage openings 23b or spray openings 23c, are formed in the other film strips, each with different opening contours. In addition to the opening geometries 23, the flow openings 50 and auxiliary openings 54 and 55 are introduced in station B.

Between each two introduced neighboring ones

Opening geometries 23 are formed at equal intervals near the film edges 56, auxiliary openings 54 as centering openings, which can be angular or circular, depending on the shape of the tools or aids that will later intervene there. The auxiliary openings 54 can also be provided as groove-like centering and feed recesses directly on the film edges 56. Other Auxiliary openings 55 are crescent-shaped, the respective opening geometries 23 and, in the upper sheet metal layer 20a, the flow openings 50 surrounding the film strips 35 are provided as openings. For example, the four crescent-shaped auxiliary openings 55 enclose with their inner contour a circle with a diameter with which the size of the perforated disk element 16 is determined. The circular areas enclosed by the auxiliary openings 55 in the film strips 35 are referred to as round plates 58. The auxiliary openings 55 taper to a point at their ends, narrow webs 59 being formed between the individual auxiliary openings 55 and having a width of only 0.2 to 0.3 mm in the region of the round diameter. During deep drawing in station E, the webs 59 tear, as a result of which the perforated disk elements 16 are exposed. In a particularly effective manner, a plurality of film strips 35 can also be combined to form a larger film carpet, on which the round plates 58 are arranged in two dimensions.

While in the film strips 35b, 35c, which the later from

Sheet metal layers 20b, 20c facing away from valve closing body 7 in the inner pot, only the central opening geometries 23b, 23c and the auxiliary openings 54, 55 are formed, the upper sheet metal layer 20a facing valve closing body 7 is additionally inserted

Flow openings 50. The flow openings 50 are, for example, drop-shaped and surround the inner inlet opening 23a in a ring shape. The individual flow openings 50 do not run exactly radially in the direction of the center of the disk, but instead have a certain degree of rotation. So is a medium flowing through in a very simple way a swirl component can be impressed. The inclined position of the flow openings 50 determines the swirl of the flow. Of course, the flow openings 50 can also be introduced in such a way that a medium flowing through them reaches the seat area 24 or the floor area 22 radially and without swirl. The flow openings 50 are located in the guide region 26 in the perforated disk element 16, as is clearly illustrated in FIGS. 4 and 5. The material areas of the upper sheet-metal layer 20a remaining between the flow openings 50 represent narrow, web-like guide surfaces 60 for guiding the valve needle 5 or the valve closing body 7. Due to the flow openings 50 provided in the perforated disk element 16, one can advantageously be introduced

Flattenings, grooves or channels which permit medium flow can be completely dispensed with on the valve closing body 7.

FIGS. 4 and 5 show sections of two examples of perforated disk elements 16, all areas 22, 24, 26, 28 and 30 being at least partially recognizable. At least the upper sheet metal layer 20a should consist of a hardenable material in order to harden the valve seat surface 25 of the seat area 24 after the deep drawing. This can be done, for example, in a ring in a circumferential strip 62, as indicated in FIG. 5. However, hardening can also be carried out over a larger area. Induction hardening, induction pulse hardening, laser beam hardening and electron beam hardening are particularly suitable. There is no need for hardening if the strain hardening is already sufficient due to the forming. The fine machining of the valve seat surface 25 of the seat area 24 is, for example so that the valve closing body 7 of the original valve needle 5 is provided with a thin, slightly abrasive, ideally detachable layer with which the valve seat is “ground in.” The applied layer is then loosened (under pressure) and rinsed out. Crystalline layers are ideal Salt, soda or the like, which can be loosened and rinsed out after the processing without leaving any residues.

The inner pot and the outer holding edge of the perforated disk element 16 are formed in the desired shape by deep-drawing or cuping the rounds 58 in the station E. If the blank diameters in the individual film strips 35 are selected to be the same size, the deep-drawing of the sheet-metal layers 20 creates the holding area 28, which is stepped at its free end. The inner sheet metal layer 20c of the holding area 28, which emerges from the lower film strip 35c, ends furthest away from the connecting area 30 when viewed in the downstream direction, while all further sheet metal layers 20 each end shorter from the inside to the outside due to the deep-drawing process (FIG. 4). The diameters of the round blanks 58 can, however, also be set in different sizes from the outset, so that after deep drawing e.g. the outer

Sheet metal layers 20 of the holding area 28 end in one plane at the free end and the inner sheet metal layer 20c of the holding area 28 further downstream on local. The protruding end 63 of the sheet metal layer 20c can be folded over, for example by bending or flanging, under the other sheet metal layer ends (FIG. 5), as a result of which a simpler attachment, for example to the valve seat support 1, can be achieved by means of the weld seam 32. The deep-drawing tool 40, which is traversed by the belt 39, is shown schematically in FIGS. 6 to 8. The band 39 rests with the edge areas outside the auxiliary openings 55 near the film edges 56, for example on a workpiece support 65, against which it is pressed by means of a hold-down device 66. The workpiece supports 65 belong to a die 67 as part of the deep-drawing tool 40. The die 67 has an at least partially frustoconical or curved opening 68, which takes over the actual die function for shaping the round plates 58 into perforated disk elements 16. An opening 69 is also provided in the hold-down device 66, which opening is predetermined by the inner wall of a sleeve-shaped cutting tool 70. In the largely cylindrical opening 69, a punch 71 is arranged to be movable perpendicular to the plane of the band 39 and is surrounded by the cutting tool 70, which is also movable. On the side of the band 39 opposite the stamp 71, a stamp counterpart 72 is provided in the partially curved but also partially cylindrical opening 68 of the die 67, which follows the movement of the stamp 71, the cylindrical portion of the opening 68 guiding the stamp counterpart 72 serves.

Together with the punch 71, the cutting tool 70 moves perpendicular to the plane of the band 39, as indicated by the arrows in FIG. 7. Due to the precisely centered and defined movement of the punch 71 and the cutting tool 70 against the punch counterpart 72 in the opening 68 of the die 67 at a high surface pressure with a force which is greater than the counterforce of the punch counterpart 72, the blank 58 is cut out very precisely from the band 39 by a cutting edge of the cutting tool 70. The cutting tool 70 comes to a standstill on a shoulder 73 of the opening 68 in the die 67, and at the same time it fixes the round plate 58 in the subsequent step

Thermoforming process. In the further course (FIG. 8), only the stamp 71 is moved into the opening 68, so that the round plate 58 is brought into a first cup-shaped configuration, which can already be the cup-shaped perforated disk element 16. For the complete training of all areas 22,

24, 26, 28 and 30 of the perforated disk element 16, however, it will often be necessary to carry out several forming operations in different tools, which are designed similarly to the tool 40 shown in FIGS. 6 to 8. In addition to cutting, these processes that take place in station E involve translational draft pressure forming such as deep drawing or cups. Bending processes can also be used.

A sheet edge 75 remains torn from the round blank 58 as waste in the deep-drawing tool 40, which, however, can be recycled and used in the production of new sheet metal foils. A firm connection of the film strips 35 in station D can be completely dispensed with if the holding area 28 of the

Perforated disk element 16 in a strongly bent shape, e.g. is generated almost perpendicular to the bottom region 22 (as shown in FIG. 1), as a result of which sufficiently strong connections are created in the bending regions.

FIG. 9 shows an exemplary embodiment of a chronological sequence when a round blank 58 is formed into a Perforated disk element 16 shown. It can be seen that several deep-drawing or bending processes are necessary in order to obtain a desired shape of the perforated disk element 16 with the areas 22, 24, 26, 28 and 30. The round blank 58 can also be shaped in a different order than that shown in FIG.

As can be seen from FIGS. 4 and 5, it is advantageous to form the spray openings 23c with an offset to the inlet opening 23a, so that the inlet opening 23a does not cover the spray openings 23c at any point in the projection. The offset can be different in different directions. The passage opening 23b is designed as a channel (cavity) connecting the inlet opening 23a with the spray openings 23c. This formation of the opening geometry 23 in the bottom area 22 of the perforated disk element 16 leads to a so-called S-blow in the flow of the medium, especially the fuel.

The S impact within the perforated disk element 16 with several strong flow deflections imparts a strong, atomization-demanding turbulence to the flow. The velocity gradient across the flow is therefore particularly pronounced. It is an expression of the change in speed across the flow, with the speed in the middle of the flow being significantly greater than near the walls. The increased shear stresses in the fluid resulting from the speed differences promote the disintegration into fine droplets near the spray openings 23c. Since the flow in the outlet is detached on one side due to the impressed radial component, it experiences this due to the lack of contour guidance no flow calming. The fluid has a particularly high speed on the detached side. The turbulence and shear stresses required for atomization are therefore not destroyed in the outlet.

The transverse impulses across the flow caused by the turbulence lead, among other things, to the

Droplet distribution density in the sprayed spray has great uniformity. This results in a reduced likelihood of droplet coagulation, that is, of associations of small droplets into larger drops. The result of the advantageous reduction in the average droplet diameter in the spray is a relatively homogeneous spray distribution. The S blow creates a fine-scale (high-frequency) turbulence in the fluid, which causes the jet to disintegrate into correspondingly fine droplets immediately after emerging from the perforated disk element 16.

FIGS. 10 and 11 show two examples of simple, two-layer perforated disk elements 16 according to the invention, in which the parts which are the same or have the same effect as the embodiment shown in FIG. 1 are identified by the same reference numerals. The perforated disc element 16 in FIG. 10 has two sheet-metal layers 20a and 20c, which, starting from the circular blank 58, were shaped in such a way that the central base region 22 with the opening geometry 23, the seat region 24 with the valve seat surface 25 and the guide region 26 with the flow openings 50 are provided are. These three areas 22, 24 and 26 in turn form a pot. However, the guide area 26 serves at the same time as a holding area 28; a connection area 30 is not provided at all. The guide region 26 is therefore already in contact with the wall of the valve seat carrier 1 in the longitudinal opening 3 with its sheet metal layer 20c facing away from the valve closing body 7. A firm connection of

Perforated disk element 16 and valve seat carrier 1 is achieved by the weld seam 32, which is attached to the valve seat carrier 1, for example, in the angled transition from the guide region 26 and the seat region 24. The inlet openings 23a of the sheet metal layer 20a have a partial offset to the spray openings 23c of the sheet metal layer 20c.

In contrast to the perforated disk element 16 in FIG. 10, the exemplary embodiment according to FIG. 11 has a differently designed seating area 24. The seating area 24 is provided with a bulge 77 from its frustoconical contour, which is directed towards the valve closing body 7 and which faces the valve closing body 7 Sheet metal layer 20a has the annular valve seat surface 25. In an advantageous manner, the bead 77 also serves to stiffen the perforated disk element 16. The introduction of the bead 77 also simplifies the attachment of the weld seam 32, since tool access is facilitated in the connection area.

Claims

claims

1. Valve, in particular fuel injection valve for fuel injection systems of internal combustion engines, with a valve longitudinal axis, with a fixed valve seat, with one interacting with the valve seat

Valve closing body, which is axially movable along the longitudinal axis of the valve, with a perforated disk which has at least one spray opening, characterized in that the perforated disk is designed as a perforated disk element (16) with at least two metal, sheet-metal layers (20) sandwiching one another and the perforated disk element (16 ) is shaped in a seating area (24) in such a way that it has the valve seat (25).

2. Valve according to claim 1, characterized in that the perforated disc element (16) has a central bottom region (22) with an opening geometry (23) for the complete passage of a medium to be sprayed, to which the seat region (24) extends radially outwards circumferential ring area connects.

3. Valve according to claim 2, characterized in that the seat area (24) tapers in a truncated cone in the downstream direction to the bottom area (22).

4. Valve according to claim 2 or 3, characterized in that in addition to the floor area (22) and the seating area

(24) a guide area (26) for guiding the axially movable valve closing body (7) on the perforated disk element (16) is provided.

5. Valve according to claim 4, characterized in that the bottom region (22), the seat region (24) and the guide region (26) are shaped such that together they form an inner pot of the perforated disc element (16).

6. Valve according to claim 4, characterized in that the guide region (26) extends annularly and axially parallel.

7. Valve according to one of claims 4 to 6, characterized in that the guide area (26) is also designed as a holding area (28) which serves to fasten the perforated disc element (16) in the valve.

8. Valve according to claim 5, characterized in that in addition to the inner pot (22, 24, 26) a holding area (28) is provided which forms the outer radial closure of the perforated disc element (16) and via a

Connection area (30) is connected to the guide area (26).

9. Valve according to one of claims 4 to 8, characterized in that in the valve closing body (7) facing sheet metal layer (20a) in the guide region (26) at least two flow openings (50) are formed.

10. Valve according to claim 9, characterized in that the flow openings (50) inclined to the valve longitudinal axis (2) are formed so that a swirl component can be impressed on a medium flowing through them.

11. Valve according to claim 9 or 10, characterized in that between the flow openings (50) remaining material areas of the inner sheet metal layer (20a) web-like guide surfaces (60) for guiding the axially movable valve closing body (7) on the perforated disc element (16).

12. Valve according to claim 2, characterized in that the opening geometry (23) in the bottom region (22) of the

Perforated disk element (16) is provided such that the spray openings (23c) in the sheet metal layer (20c) facing away from the valve closing body (7) have at least a partial offset to an inlet opening (23a) in the sheet metal layer (20a) facing the valve closing body (7).

13. A method for producing a valve seat for a valve, in particular for a valve according to one of claims 1 to 12, with the method steps a) providing at least two thin metal sheet foils (35) in the form of foil strips or foil carpets, b) introducing the same opening geometries (23) and auxiliary openings (54, 55) per sheet foil (35) in large

Number, c) bringing together the individual sheet foils (35) to produce a strip (39) with a large number of round blanks

(58), d) separating the round plates (58) and shaping the round plates (58) into perforated disk elements (16), which have at least one base region (22) with the opening geometry (23) and one seat region (24) with the valve seat (25) exhibit.

14. A method of manufacturing a valve seat for a

Valve, in particular for a valve according to one of claims 1 to 12, with the method steps a) providing at least two thin metal sheet foils (35) in the form of foil strips or foil carpets, b) introducing the same opening geometries (23) and auxiliary openings (54, 55) per sheet metal foil (35) in large numbers, c) bringing the individual sheet metal foils (35) together, d) connecting the sheet metal foils (35) by using a

Joining method, a band (39) having a plurality of round plates (58) is present, e) separating the round plates (58) and shaping the round plates (58) into perforated disc elements (16) which have at least one base region (22) with the opening geometry ( 23) and a seating area (24) with the valve seat (25).

15. The method according to claim 13 or 14, characterized in that in addition to the opening geometries

(23) and the auxiliary openings (54, 55) in a sheet metal foil (35) flow openings (50) are introduced.

16. The method according to claim 15, characterized in that the introduction of the opening geometries (23), the auxiliary openings (54, 55) and the flow openings (50) by means of punching, laser cutting, eroding or etching.

17. The method according to claim 14, characterized in that the connection of the sheet metal foils (35) is carried out by means of welding, soldering or gluing.

18. The method according to claim 13 or 14, characterized in that the shaping of the blanks (58) by means of deep drawing or cups with the aid of a deep drawing tool

(40) takes place.

19. The method according to claim 18, characterized in that the separation of the blanks (58) by a cutting tool

(70) in the deep-drawing tool (40) before forming.

20. The method according to any one of claims 13 to 19, characterized in that after the shaping, the valve seat (25) is hardened in the seat region (24).