An apparatus for filtering a fluid, in particular a plastic melt having impurities, and a valve device for such a fluid

Abstract

An apparatus for filtering a fluid (e.g., a plastic melt having impurities) comprises a housing (104, 106, 206, 4, 6) having at least one inlet for the introduction of the fluid, an outlet for the supply of the fluid, and a cavity (108, 8) formed within the housing (104, 106, 206, 4, 6) by a wall (106) of the housing (104, 106, 206, 4, 6) for receiving a sieve support (10, 12); and a sieve support (10, 12) movably disposed within the cavity (108, 8) of the housing (104, 106, 206, 4, 6) for receiving at least one filter element (14) for filtering the fluid, the sieve support (10, 12) having a longitudinal axis (12). The sieve support (10, 12) has a plurality of integrally formed raised portions (102, 116, 16) on the exterior, and / or a plurality of raised portions (102, 116, 16) and / or a plurality of recesses are formed in the wall (106) of the housing (104, 106, 206, 4, 6) that defines the cavity (108, 8). A plurality of gaps / cavities are provided between the wall and the sieve support (10, 12), thereby allowing a slight fluid flow during operation. Another embodiment relates to a valve device.

Description

Background Art

[0001] [Cross - reference to Related Applications] This application claims the benefit of European Patent Application No. 19212184.6, filed on November 28, 2019. The disclosure of that application is incorporated herein by reference as if fully set forth herein.

[0002] [Background] The present invention relates to an apparatus for filtering fluids, in particular plastic melts having impurities, the apparatus comprising a housing having at least one inlet for introducing the fluid, an outlet for supplying the fluid, and a cavity formed by the wall of the housing within the housing for receiving a sieve support, and a sieve support movably disposed within the cavity of the housing for receiving at least one filter element for filtering the fluid and having a longitudinal axis.

[0003] Such an apparatus for filtering fluids is known from the prior art. A common type of filtering apparatus comprises at least one sieve support on which one or more filter elements are arranged. The sieve support is partially accommodated within the housing cavity and is movably arranged relative thereto. In this situation, the sieve support can be moved to a filtering position where the fluid supplied through the housing inlet is guided there and filtered through the filter of the sieve support in the direction of the fluid outlet, and the sieve support can also be moved to a so - called sieve exchange position where the one or more filter elements become accessible for replacement or maintenance and the sieve support is moved out of the housing cavity. After the maintenance or replacement process, the sieve support is newly moved to the filtering position and then the filtering operation is continued.

[0004] In known filtering devices from the prior art, the sieve support is generally arranged with little play in the cavity of the housing. Such a play-free arrangement of the sieve support within the housing cavity seals the sieve support against the housing and prevents the melt from escaping (leaking) even at high operating pressures.

[0005] However, in some processes (treatments) of molten materials, a high level of sealing integrity between the sieve support and the housing cavity has been found to be disadvantageous. For example, when processing polycarbonate melt, so-called "cracks" can be observed. In that case, a carbon layer is formed in the contact area between the sieve support and the housing cavity, which can result in the sieve support becoming wedge-shaped in its mounting position and being removable only with great effort and strong force. Also, when processing cellulose-based lyocell melt, in the combination with the material of the sieve support or the housing - typically steel - it has been found that the stagnation of the melt in the area between the sieve support and the housing cavity can form an explosive mixture, which is also undesirable.

[0006] To overcome some of the aforementioned drawbacks, EP 0 915 729 B1 proposes arranging plastic spacers on the sieve support, thereby enabling fluid flow between the sieve support and the surrounding housing in an area-by-area manner during operation of the device. However, the proposed structure has the drawback that the spacers are arranged unevenly and asymmetrically around the sieve support, and it has been found that this makes it difficult to achieve accurate guidance, particularly the centering of the sieve support with respect to the housing cavity.

[0007] In some areas of use, the basic material of the sieve support, generally steel, also has the drawback of having a different coefficient of thermal expansion compared to the proposed plastics. Furthermore, the use of such spacers increases the manufacturing complexity of such sieve supports since options for fixing (the members) must be provided for the spacers on the sieve support. Depending on the respective plastics used, the spacers are furthermore exposed to an increased amount of wear and must be replaced regularly.

Summary of the Invention

[0008] With the above background in mind, the object of the present invention is to develop a filtering device of the kind described at the beginning of this specification such that the disadvantages encountered in the prior art are eliminated as much as possible. In particular, the object of the present invention is to provide a filtering device that allows for the exchange of fluid between the sieve support and the housing cavity, compensates for a more accurate guidance of the sieve support with respect to the housing cavity, and is more wear-resistant.

[0009] According to the present invention, the above object is achieved in a filtering device, characterized in that the sieve support has, externally, a plurality of integrally formed raised portions and / or a non-rotationally symmetric cross-section, and / or a plurality of raised portions and / or a plurality of recesses are formed in the wall of the housing that delimits the cavity, and a plurality of gaps / cavities are provided between the wall and the sieve support, whereby a slight fluid flow is made possible during operation.

[0010] Accordingly, the present invention is based on the realization of providing a plurality of raised portions and / or a plurality of recesses in the wall portion that partitions (separates) the cavity of the sieve support and / or the housing, and the plurality of raised portions and / or recesses are integrally formed with their respective main body parts - the sieve support and / or the housing - and thus are integral and of the same material. The plurality of raised portions and / or recesses result in a plurality of gaps / cavities being formed between the wall portion and the sieve support, and during operation, fluid can flow into those gaps / cavities, but the problem of fluid (leakage) from the device is minimal. Thereby, the formation of a carbon layer when treating a polycarbonate melt or the generation of an explosive mixture when treating a lyocell melt can be prevented.

[0011] In this regard, the integral form of the plurality of raised portions and / or the plurality of recesses has the effect of reducing manufacturing complexity compared to a structure including a plurality of parts and a plurality of materials. Both the sieve support and the housing can be manufactured from a single workpiece respectively and can be processed inexpensively by standard processing methods. Furthermore, the one-piece or integral form of the plurality of raised portions and / or the plurality of recesses has the advantage that all parts of the housing and the sieve support experience a certain thermal expansion, and as a result, the involved gap dimensions are maintained substantially uniformly even when the device is heated or cooled. Moreover, the plurality of raised portions are exposed to a lesser degree of wear compared to its structure including plastic. In this regard, the occurrence of gap dimensions that can vary according to wear is also avoided.

[0012] In a second aspect of the invention, or in an advantageous development of the invention according to the first aspect, according to the invention, the sieve support has, externally, at least three, preferably four, raised portions, and / or in the wall of the housing delimiting the cavity, a plurality of raised portions and / or a plurality of recesses are provided, which are arranged so as to be distributed along the periphery of the sieve support, the sieve support being arranged substantially centered within the cavity of the housing, and a plurality of gaps / cavities being provided between the wall and the sieve support, thereby allowing a slight fluid flow during operation.

[0013] Arranging at least three raised portions along the periphery of the sieve support ensures that the sieve bolts are accommodated in a centered relationship within the cavity of the housing, and at the same time ensures that a slight fluid flow is possible between the housing and the sieve support during operation of the device.

[0014] According to a preferred development, the plurality of raised portions extend substantially linearly in the direction of the longitudinal axis of the sieve support, preferably over substantially the entire length of the sieve support. The geometry of such raised portions can not only be accurately manufactured by standard manufacturing methods, but at the same time allows for a sure and centered, non-tilted guidance of the sieve support into the housing cavity.

[0015] It is further preferred that the plurality of raised portions are arranged evenly spaced in the direction of the periphery of the sieve support. Arranging the plurality of raised portions evenly spaced in the direction of the periphery of the sieve support provides for an accurate centering of the sieve support within the housing cavity, and at the same time, a wide peripheral area of the sieve support is accessible for the desired slight fluid flow between the housing and the sieve support during operation.

[0016] According to a preferred development form, the plurality of raised portions have a height in the range of about 0.05 to about 3 mm, preferably in the range of about 0.1 to about 0.2 mm, relative to the diameter of the other part of the sieve support. The specified height range has proven to be particularly suitable on the one hand to achieve a sufficient sealing effect between the housing and the sieve support, and on the other hand to allow a desired slight fluid flow between the components.

[0017] Furthermore, according to a preferred embodiment, the plurality of raised portions are formed from a low wear material, in particular metal or plastic. The use of metal has the advantage of the same or very substantially similar thermal expansion of the plurality of raised portions with respect to the housing and the sieve support, so that the gap dimensions involved remain very substantially uniform. The use of plastic has also proven to be suitable for some application areas or molten materials due to the high level of chemical resistance and wear resistance of some plastics.

[0018] A further development form of the present invention provides that the sieve support has a cross-section of equal thickness in a direction perpendicular to the longitudinal axis of the sieve support and / or the wall of the housing partitioning the cavity, and the cross-section provides the plurality of raised portions of the sieve support and / or the plurality of raised portions and / or the plurality of recesses of the wall.

[0019] The term "cross-section of equal thickness" is used to represent a cross-section in which the tangents of two parallel supports arranged on opposite sides in contact with the cross-section are always at the same distance from each other. The tangents of the supports need to be selected such that they have at least one point in common with the boundary of the cross-section but no points in common with the interior of the cross-section. In this regard, providing a cross-section of equal thickness has proven to be particularly advantageous both for achieving accurate centering of the sieve bolts with respect to the housing cavity and for providing a suitable size gap or cavity to allow a slight fluid flow between the wall and the sieve support.

[0020] Preferably, the wall portion of the housing that partitions the cavity is cylindrical, and the sieve support has a cross-section of equal thickness in a direction perpendicular to its longitudinal axis. The corresponding sieve support achieves the aforementioned advantages and is compatible with existing housing systems.

[0021] According to another embodiment, the sieve support is cylindrical, and the wall portion of the housing that partitions the cavity has a cross-section of equal thickness.

[0022] It is more preferable that the cross-section of equal thickness is in the form of an equilateral triangle or a square of equal thickness. Depending on each molten material to be processed and the desired degree of fluid flow between the wall portion and the sieve support, a cross-section of equal thickness can be appropriately selected in the form of an equilateral triangle or a square cross-section.

[0023] An aspect of the present invention provides that the cross-section of equal thickness is in the form of a roulo triangle. Such a triangle is based on an equilateral triangle having a part of a circle (sector) instead of the (straight) sides of the triangle. The radii of these sectors correspond to the length of the sides of the underlying equilateral triangle. Making a cross-section of equal thickness in the form of a roulo triangle provides, on the one hand, the advantage of easy manufacturing and, on the other hand, allows for accurate centering of the sieve support with respect to the wall portion of the housing. The cross-sectional area is minimized compared to other structures of equal thickness, thereby increasing the volume (capacity) with respect to the gap or cavity.

[0024] According to another embodiment, the sieve support has a polygonal cross-section in a direction perpendicular to the longitudinal axis of the sieve support and / or the wall portion of the housing that partitions the cavity, and the cross-section has, in particular, three, four, five, or more corner portions, which are preferably rounded. According to another preferred embodiment, the sieve support has an elliptical cross-section in a direction perpendicular to the longitudinal axis of the sieve support and / or the wall portion of the housing that partitions the cavity.

[0025] The configuration of the cross-section of the sieve support or the wall section in the form of a polygon or an ellipse ensures a sufficient flow of fluid that can be sufficiently influenced between the wall section and the sieve support, centers the sieve support and the housing with respect to each other, and has proven to be an alternative advantageous form for implementing more cost-effective manufacturability.

[0026] A further development of the invention provides that the sieve support is arranged to be movable radially and / or axially within the cavity. In this regard, in addition to the purely axial mobility of the sieve support, its radial movement component, thanks to the radial movement of the sieve support or a combined radial and axial movement, can contribute to reducing the formation of a carbon layer when processing a polycarbonate melt and reducing the formation of an explosive mixture when using a lyocell melt.

[0027] The present invention has been described above with respect to a filtering device. In a further aspect, the present invention relates to a valve device, particularly a valve device for a plastic melt having impurities, comprising a housing having at least one inlet for introducing the fluid, at least one outlet for supplying the fluid, and a cavity formed by the wall of the housing within the housing for receiving a valve bolt, and a valve bolt movably arranged within the cavity of the housing for selectively enabling, distributing, and / or shielding the flow of fluid through the housing.

[0028] The valve devices known from the prior art also have the drawbacks described above in connection with filtering devices when processing polycarbonate melts, particularly regarding the deposition of a carbon layer between the valve housing and the valve bolt, and the risk of formation of an explosive mixture when processing lyocell melts.

[0029] In this regard, the present invention provides that the valve bolt has, externally, a plurality of integrally formed raised portions and / or a non-rotationally symmetric cross-section, and / or a plurality of raised portions and / or a plurality of recesses are formed in the wall portion of the housing partitioning the cavity, and a plurality of gaps / cavities are provided between the wall portion and the valve bolt, thereby enabling a slight fluid flow during operation, and the above object is achieved by a valve device characterized by this.

[0030] The valve device enjoys the same advantages as the filtering device according to the present invention. In particular, the valve device allows a slight fluid flow between the wall portion and the valve bolt, thereby preventing or reducing the deposition of a carbon layer between the valve bolt and the valve housing when using a polycarbonate melt, thereby avoiding the dulling of the movement of the valve bolt or the blocking of the valve bolt. On the other hand, in the case of a lithium iodine application, the formation of an explosive mixture is prevented.

[0031] The integrated form of the plurality of raised portions and / or recesses further simplifies manufacturing and provides predictable gap dimensions that are very substantially uniform even when thermal expansion occurs and allow a high degree of centering of the components with respect to each other.

[0032] According to a further aspect of the present invention, or according to an advantageous development of the valve device according to the present invention, it is proposed that the valve bolt has, externally, at least three, preferably four, raised portions, and / or a plurality of raised portions and / or a plurality of recesses are provided in the wall portion of the housing partitioning the cavity, and they are arranged so as to be distributed along the periphery of the valve bolt, and the valve bolt is arranged substantially centered within the cavity of the housing, and a plurality of gaps / cavities are formed between the wall portion and the valve bolt, thereby enabling a slight fluid flow during operation.

[0033] An advanced form of the present invention provides that a plurality of raised portions extend substantially linearly in the direction of the longitudinal axis of the valve bolt, preferably over substantially the entire length of the valve bolt. In a preferred embodiment, the plurality of raised portions are uniformly spaced in the direction of the periphery of the valve bolt. Further, the plurality of raised portions preferably have a height in the range of about 0.05 to about 3 mm, more preferably in the range of about 0.1 to about 0.2 mm, relative to the diameter of the other portions of the valve bolt.

[0034] In a preferred embodiment, the plurality of raised portions are formed from a low-wear material, particularly a metal or a plastic. An advanced form of the present invention provides that the valve bolt has a cross-section of equal thickness in a direction perpendicular to the longitudinal axis of the valve bolt and / or the wall of the housing defining the cavity, and the cross-section provides the plurality of raised portions of the valve bolt and / or the plurality of raised portions and / or the plurality of recesses of the wall. Preferably, the cross-section of equal thickness is in the form of a triangular or square cross-section of equal thickness.

[0035] Regarding the advantages of such a form of the valve bolt and / or the wall of the housing defining the cavity, reference is made to the foregoing description of the filtering device. It applies here in a similar manner.

[0036] In a preferred embodiment, the cross-section of equal thickness is in the form of a Rouleau triangle. Such a cross-section can be manufactured with a low level of labor and cost, which allows the flow of fluid during operation between the wall and the valve bolt, and at the same time provides centering of the valve bolt with respect to the housing.

[0037] In an alternative embodiment, the valve bolt has a polygonal cross-section in a direction perpendicular to the longitudinal axis of the valve bolt and / or the wall of the housing defining the cavity, and the cross-section has, in particular, three, four, five, or more, corner portions. Preferably, the corner portions are rounded.

[0038] In a further alternative embodiment, the valve bolt has an elliptical cross-section in a direction perpendicular to the longitudinal axis of the valve bolt and / or the wall of the housing partitioning the cavity.

[0039] Regarding the advantages of the foregoing embodiments, attention is drawn to the foregoing description of the filtering device.

[0040] Developments of the present invention provide that the valve device is in one of the following forms: a shut-off valve, a distribution valve. Valves of the type described are frequently used in devices for processing plastic melts.

[0041] The present invention will be described in more detail below by way of preferred embodiments by way of example with reference to the accompanying drawings.

Brief Description of the Drawings

[0042]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8a

Figure 8b

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

DETAILED DESCRIPTION OF THE INVENTION

[0043] Figure 1 shows a filtering device 2 comprising a housing 4 having a receiving cavity 8 in which a sieve support 10 is received. The sieve support 10 is arranged movably with respect to the cavity 8 in the direction of the longitudinal axis 12 of the sieve support 10. The housing 4 has, in a manner known per se, an inlet for the introduction of the fluid to be filtered and an outlet for the supply of the filtered fluid (not shown).

[0044] On its outer side, the sieve support 10 has a plurality of integral sieve support ridges 16. The receiving cavity 8 of the housing 4 is cylindrical. As a result, in the region of the wall portion 6 of the housing, a plurality of gaps or cavities 18 are formed between the receiving cavity 8 and the sieve support 10, and these gaps or cavities 18 allow a slight fluid flow during operation. Figure 2 shows a side view of the filtering device 2.

[0045] Figure 3 shows the structural form of the sieve support 10 by means of a cross-sectional view that is a cross-section along the A-A plane of Figure 2. The sieve support 10 has a filter element 14, by which the fluid is filtered. In the case of this embodiment, the sieve support 10 has a total of four sieve support ridges 16 arranged at equal intervals around the periphery of the sieve support 10. In addition to centering the sieve support 10 within the receiving cavity 8, the arrangement of the sieve support ridges 16 provides that a plurality of gaps or cavities 18 are formed between the wall portion and the sieve support 10, and fluid flow is enabled within those gaps or cavities 18 during operation.

[0046] Figure 4 shows the filtering device 2 in a so-called sieve replacement position. The sieve support 10 is moved to the outside of the housing 4 to such an extent that one of the filter elements 14 is accessible from the outside of the housing 4 and can undergo replacement or maintenance procedures. In Figure 5, the filtering device 2 is in an operating position, where the fluid can be filtered by the filter element 14. The filter element 14 cannot be accessed from the outside of the filtering device 2 in the filtering position.

[0047] Figures 6 and 7 show the sieve support 10 without the filter element 14 fitted into the filter element mounting portion 20. In this case, the sieve support ridges 16 are arranged uniformly spaced around the periphery of the sieve support 10 and extend linearly in the direction of the longitudinal axis 12 of the sieve support 10.

[0048] The cross-section of the sieve support 10 is shown in FIG. 8a. Also in this case, the drawing shows the arrangement of the sieve support ridges 16, which are arranged evenly spaced around the periphery. In this case, the sieve support 10 has four sieve support ridges, but the invention is not limited to this arrangement. Rather, it is also possible to arrange three sieve support ridges 16 on the sieve support 10, or alternatively, to arrange an even larger number of ridges 16. The ridges 16 extend in the direction of the longitudinal axis 12 of the sieve support 10, in particular linearly. The ridges 16 have a height h in the range from about 0.05 to about 3 mm, preferably in the range from about 0.1 to about 0.2 mm, relative to the diameter of the other parts of the sieve support 10. In the case of this embodiment, the ridges 16 are formed from metal, but they could also be formed from another material, preferably in particular a low-wear material such as plastic.

[0049] FIG. 8b shows an alternative embodiment 10' of the sieve support. The sieve support 10' arranged within the cylindrical receiving cavity 8 has a cross-section 22 of equal thickness. In the case of this embodiment, the cross-section 22 of equal thickness is in the form of an equal-thickness triangular cross-section 22. Compared to the embodiment of the sieve support 10 shown in FIG. 8a, the sieve holder 10' shown in FIG. 8b has a larger gap or cavity 18 between the wall part 6 of the housing and the sieve support 10'. Basically, as a result, the configuration of the sieve support 10' with a cross-section 22 of equal thickness allows for a greater fluid flow between the receiving cavity 8 and the sieve support 10', and at the same time, the sieve support 10' can be accurately centered within the cavity 18.

[0050] Figures 9 through 13 show an embodiment of a shut-off valve 102 comprising a housing 104 having a wall portion 106 and forming a receiving cavity 108. The shut-off valve 102 is based on the same inventive idea as the filtering device 2. The housing 104 has a first inlet / outlet 120 and a second inlet / outlet 122. Disposed within the receiving cavity 108 is a valve bolt 110 which is axially movably disposed relative to the housing 104 along the longitudinal axis 112 of the valve bolt 110.

[0051] The valve bolt 110 preferably has a continuous flow path in the form of a cylindrical bore 124 which enables passage of fluid from the first inlet / outlet 120 to the second inlet / outlet 122 when in proper alignment with the housing 104 of the valve bolt 110 to be in fluid communication with the first inlet / outlet 120 and the second inlet / outlet 122, and blocks the fluid flow from the first inlet / outlet 120 to the second inlet / outlet 122 when the flow path is out of fluid communication with the first inlet / outlet 120 and the second inlet / outlet 122.

[0052] Accordingly, in the operating state shown in Figures 9 through 11, the shut-off valve 102 is in a passage position where fluid flow from the first inlet / outlet 120 to the second inlet / outlet 122 is enabled. When the valve bolt 110 is moved to the position shown in Figures 12 and 13, the valve bolt 110 blocks the fluid flow from the first inlet / outlet f20 to the second inlet / outlet f22. The shut-off valve 102 is in a shut-off position in the state shown in Figures 12 and 13.

[0053] On the outside, the valve bolt 110 has a plurality of integral valve bolt raised portions 116. The receiving cavity 108 of the housing 104 or the corresponding wall portion 106 of the housing forms a cylindrical cavity. In a similar manner to that regarding the filtering device 2, a plurality of gaps or cavities 118 are formed in the region between the raised portion 116 and the wall portion 106, allowing for a slight fluid flow during operation in these gaps or cavities 118. Arranging the valve bolt raised portions 116 along the periphery of the valve bolt 110 also provides that it is substantially centered within the cavity 108 of the housing 104.

[0054] According to the present invention, in this embodiment, the valve bolt 110 can alternatively be in a rotationally symmetric form, and the wall portion 106 of the housing can have a plurality of raised portions and / or a plurality of recesses. Further, according to the present invention, the valve bolt 110 can have integral raised portions 116, and / or can have a non-rotationally symmetric cross-section, and the wall portion 106 of the housing can have a plurality of raised portions and / or a plurality of recesses. Similar to the figure of FIG. 8a, the valve bolt 110 can have a plurality of raised portions 116 uniformly spaced around its periphery, while as shown in FIG. 8b, it can have a cross-section of equal thickness or a polygonal or elliptical cross-section.

Description of the reference numerals

[0055] 2 Filtering device 4 Housing 6 Wall portion of the housing 8 Receiving cavity 10, 10’ Sieve support 12 Longitudinal axis of the sieve support 14 Filter element 16 Sieve support raised portion 18 Gap / Cavity 20 Filter element mounting portion 22 Cross-section of equal thickness (triangle) Height of the raised portion 102 Shut-off valve 104 Housing 106 Wall portion of the housing 108 Receiving cavity 110 Valve bolt 112 Longitudinal axis of the valve bolt 116 Valve bolt raised portion 118 Gap / cavity 120 First inlet / outlet 122 Second inlet / outlet 124 Flow path 202 Distribution valve 204 Housing 206 Wall portion of the housing 208 Receiving cavity 210 Valve bolt 212 Longitudinal axis of the valve bolt 216 Valve bolt raised portion 218 Gap / cavity 220 First inlet / outlet 222 Second inlet / outlet 224 Third inlet / outlet 226 Fourth inlet / outlet 228 Upper inlet / outlet

Claims

1. A filtering device for filtering a fluid, comprising: A housing having at least one inlet for introducing the fluid, an outlet for supplying the fluid, and a cavity formed by a wall of the housing within the housing for receiving a sieve support; Comprising: The sieve support is movably disposed within the cavity of the housing for receiving at least one filter element for filtering the fluid, and has a longitudinal axis; Comprising: 1) The sieve support has, externally, a plurality of integrally formed raised portions integrally formed with and of the same material as the sieve support, and / or one non-rotationally symmetric cross-section; And / or 2) A plurality of raised portions and / or a plurality of recesses are formed in the wall of the housing partitioning the cavity, A plurality of gaps / cavities are provided between the wall and the sieve support, thereby allowing a slight fluid flow during operation. A filtering device characterized by the above.

2. 1) The sieve support has, externally, at least three raised portions; And / or 2) In the wall of the housing partitioning the cavity, a plurality of raised portions and / or a plurality of recesses are provided, which are arranged and distributed along the periphery of the sieve support, and the sieve support is arranged substantially centered within the cavity of the housing; A plurality of gaps / cavities are provided between the wall and the sieve support, thereby allowing a slight fluid flow during operation. The filtering device according to claim 1, characterized by the above.

3. The plurality of raised portions extend linearly in the direction of the longitudinal axis of the sieve support. The filtering device according to claim 1 or 2, characterized by the above.

4. The plurality of raised portions are uniformly spaced in the direction of the periphery of the sieve support. The filtering device according to claim 1 or 2, characterized by the above.

5. The plurality of raised portions have a height in the range of 0.05 to 3 mm with respect to the diameter of the sieve support. The filtering device according to claim 1 or 2, characterized by the above.

6. The plurality of raised portions are formed of metal or plastic The filtering device according to claim 1 or 2, characterized in that

7. The sieve support has a cross-section of equal thickness in a direction perpendicular to the longitudinal axis of the sieve support and / or the wall of the housing defining the cavity, The cross-section provides the plurality of raised portions of the sieve support and / or the plurality of raised portions and / or the plurality of recesses of the wall portion The filtering device according to claim 1 or 2, characterized in that

8. The cross-section of equal thickness has a form with a cross-section of equal thickness that is triangular or quadrangular The filtering device according to claim 7, characterized in that

9. The cross-section is in the form of a triangular louvre The filtering device according to claim 7 or 8, characterized in that

10. The sieve support has a polygonal cross-section in a direction perpendicular to the longitudinal axis of the sieve support and / or the wall of the housing defining the cavity, The cross-section has three, four, five, or more, corner portions The filtering device according to claim 1 or 2, characterized in that

11. The sieve support is arranged in a direction perpendicular to the longitudinal axis of the sieve support and / or the wall of the housing defining the cavity and has an elliptical cross-section The filtering device according to claim 1 or 2, characterized in that

12. The sieve support is arranged to be movable radially and / or axially within the cavity The filtering device according to claim 1 or 2, characterized in that

13. A valve device for a fluid, A housing having at least one inlet for the introduction of the fluid, at least one outlet for the supply of the fluid, and a cavity formed by the wall of the housing within the housing for receiving a valve bolt Comprising The valve bolt is movably arranged within the cavity of the housing to selectively enable, distribute, and / or block the flow of fluid through the housing, 1) The valve bolt has a plurality of integrally formed raised portions and / or a non-rotationally symmetric cross-section externally, And / or, 2) A plurality of raised portions and / or a plurality of recesses are formed in the wall portion of the housing that partitions the cavity. A plurality of gaps / cavities are provided between the wall portion and the valve bolt, thereby allowing a slight fluid flow during operation. The valve bolt has a cross-section of equal thickness in the longitudinal axis of the valve bolt and / or in a direction perpendicular to the wall portion of the housing that partitions the cavity. The cross-section provides the plurality of integrally formed raised portions of the valve bolt and / or the plurality of raised portions and / or the plurality of recesses of the wall portion. A valve device characterized by the above.

14. The sieve support has, on the outside, a plurality of integrally formed raised portions. A filtering device according to claim 1 or 2, characterized by the above.

15. The sieve support is integrally formed of steel. A filtering device according to claim 1 or 2, characterized by the above.

16. The fluid is a plastic melt having impurities. A filtering device according to claim 1 or 2, characterized by the above.

17. The sieve support has, on the outside, at least four raised portions. A filtering device according to claim 1 or 2, characterized by the above.

18. The height ranges from 0.1 to 0.2 mm. A filtering device according to claim 5, characterized by the above.

19. The plurality of raised portions are formed of the metal. A filtering device according to claim 6, characterized by the above.

20. The corner portion is rounded. A filtering device according to claim 10, characterized by the above.

21. The fluid is a plastic melt having impurities. A valve device according to claim 13, characterized by the above.

22. The plurality of raised portions are formed of the plastic. A filtering device according to claim 6, characterized by the above.

23. The plurality of raised portions are arranged at uniform intervals in the peripheral direction of the valve bolt. A filtering device according to claim 13, characterized by the above.

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