Sealing stop valve for fluid pipeline

Abstract

The invention relates to a shut-off valve (1) for fluid lines, comprising an inlay (2) which is rotationally symmetrical with respect to its basic shape with respect to its longitudinal axis (Y-Y) and comprising a housing (3), the inlay being sealingly fixed in a receptacle (7) of the housing, being rotatable about its longitudinal axis (Y-Y) between an open position and a closed position and being detachable, at least one seal (15) is arranged on the jacket (14) of the inlay, said seal sealing a gap (16) between the housing and the inlay. It is suggested that the width of the gap (16) is set to be variable in the axial and / or circumferential direction relative to the longitudinal axis (Y-Y) of the inlay, that is to say achieved by the design of the inner circumferential surface of the housing and / or the outer circumferential surface of the inlay, the surface (s) being non-circular at least in some regions when viewed from the cross-section in the direction of the axis (Y-Y) of the receptacle.

Description

Technical Field

[0001] The invention relates to a stop valve for a fluid line, comprising an inlay which is rotationally symmetrical in its basic shape with respect to its longitudinal axis, and a housing having a fluid inlet and an outlet and an inlay receptacle in its wall, wherein the receptacle has an inlay insertion opening and a bottom, wherein the inlay is fixed in a sealing manner in the receptacle of the housing and can be rotated about its longitudinal axis between an open position and a closed position and can be removed, wherein the fluid inlet and outlet in the open position of the inlay are connected to one another via a through-channel of the inlay and are closed by respective wall regions of the inlay in the closed position of the inlay, wherein the through-channel of the inlay has a fluid channel inlet and a channel outlet which correspond to the inlet and outlet of the housing, and wherein at least one seal is arranged on the jacket of the inlay, which seals the gap between the housing and the inlay. Background Art

[0002] In known valves of this type, the seal, in particular the elastic sealing cord or the sealing ring, is always uniformly compressed by default, because the inlay, which is arranged coaxially with the axis of the receptacle and within the housing, is generally of (hollow) cylindrical or (hollow) conical basic design and thus has a circular contour when viewed in axial section. This results in an annular gap between the outer circumference of the inlay and the inner circumference of the housing, the gap width of which is essentially constant and runs uniformly in the axial and circumferential directions. In the uncompressed state, the seal typically has a thickness that is greater than the gap width.

[0003] In the concrete case, the known valve is a valve for automotive engineering, in particular for fuel lines, wherein the inlay and / or the housing are preferably manufactured as a plastic injection-molded part, thereby enabling economical mass production with an optimally low weight / performance ratio.

[0004] In this case, all of the above-mentioned structural features known from the prior art essentially ensure a high functionality of the known shut-off valve at low-cost production.

[0005] In this case, particular emphasis is placed on the positioning of the seal on the inlay housing, i.e. the seal is not fixedly mounted in the housing, e.g. as a bushing or sealing cartridge, and has no additional fastening means, but moves with the inlay when the shut-off valve is operated. This allows for optimal ease of installation and interchangeability.

[0006] However, with such valves, there is a risk that the seal, which is always compressed by default, will "stick" to the housing wall if the valve is only operated rarely. The permanent pressurization of the seal also promotes viscoelastic flow processes, which can cause it to deform and reduce its sealing efficiency.

[0007] For example, in some applications, the valve is only operated to close once or twice a year, and is kept open all the time to allow fluid to flow. In such rare cases where the valve is operated to close, the seal may be damaged by the shear stress generated by the rotation of the inlay when it inevitably falls off the housing wall.

[0008] Essentially, one way to address this problem is to use a material with very low surface free energy for the seal, which is less prone to unwanted adhesion to the housing wall. However, such materials are often more expensive than the default material, negatively impacting valve manufacturing costs. This technical measure may not completely resolve the issue.

[0009] It is also possible to briefly close and reopen the shutoff valve at short, set intervals during maintenance to prevent the seal from sticking to the housing, even if this is not necessary from a functional point of view. However, this can negatively increase the maintenance effort.

[0010] Furthermore, when the shut-off valve is switched, one or both seals arranged on the inlay sleeve also slide over the housing-side inlet and, if necessary, the housing-side outlet in the housing wall, and thus wear rapidly under frequent operation. While this wear problem can be counteracted by high-quality deburring of the edges of the inlet and outlet openings, this deburring process is usually relatively complex and time-consuming due to the geometrical shape of the housing inlet and outlet areas. Summary of the Invention

[0011] The object of the present invention is therefore to create a shut-off valve of the type mentioned at the outset which avoids the above-mentioned disadvantages and ensures a long-term stable function and sealing effect.

[0012] This object is achieved according to the features of claim 1 in that the gap width between the housing and the inlay is arranged to be variable in the axial and / or circumferential direction relative to the longitudinal axis of the inlay, i.e. by a structural geometric design of the inner circumferential surface of the housing and / or of the outer circumferential surface of the inlay sheath, wherein the surface(s) are at least regionally non-circular, as seen in a cross section in the axial direction of the receptacle.

[0013] This change in the gap width between the housing and the inlay ensures that the seal exerts at least less pressure in the inlay's open position than in its closed position. Ideally, the seal is even supported in the sealing gap with virtually no compression, i.e., exposed to the outside. Only then does the seal begin to be compressed gradually, particularly along the closing path, when the valve is closed, until a fully sealed position is achieved when the inlay is in the closed position.

[0014] According to the present invention, it is also possible to achieve multiple open positions for the inlay. To this end, the housing comprises several pairs of inlet openings and corresponding outlet openings in its wall, which are distributed around the circumference of the housing. The inlet openings and corresponding outlet openings forming a pair are preferably diametrically opposed. In this case, the inlay fluidically connects the pair via its through-channel, depending on its rotational position in one of the open positions. In particular, multiple closed positions are also possible, each of which is formed between the open positions by the wall of the housing.

[0015] In this case, it is also advantageous that the rotational resistance of the operating stop valve when closed is optimally low compared to the prior art, at least at the beginning of the operating process.

[0016] According to an advantageous embodiment of the stop valve according to the invention, it can be provided in this case in particular that the housing has an arc-shaped contour in a partial area of ​​its inner circumference (in which the fluid inlet and outlet converge) and in a partial area of ​​the wall adjacent to this area on one side or both sides, as viewed in a cross section in the axial direction of the housing.

[0017] In a partial region of the inner circumference of the housing between the aforementioned regions, the receptacle can be designed such that the inner diameter of the housing and thus the gap between the housing and the inlay widens in the rotational direction of the inlay that is effective during opening.

[0018] In this case, when the valve according to the invention is in the installed state, the axis of the housing receptacle coincides with the longitudinal axis of rotation of the inlay. Advantageously, according to the invention, no eccentric shaft arrangement with a relatively more complex inlay bearing in the housing is required.

[0019] The invention is based on the idea that the above-mentioned problems of the prior art are not solved primarily by the choice of sealing material or by additional maintenance operations on the valve, although these technical measures can of course be provided optionally within the scope of the invention, but rather by the structural geometric design of the housing and / or the inlay, in particular by the structural geometric design of the inner circumferential surface of the housing and / or the outer circumferential surface of the inlay.

[0020] Conventional sealing rings or other sealing elements which are economical in material and can be produced with minimal technical effort can advantageously be used for sealing, by arranging at least one elastic sealing element on the sheath of the inlay which is held in the recess of the inlay as a circular sealing ring or a sealing element which is formed using a multi-component injection molding process.

[0021] However, if a conventional sealing ring is used, the groove of the inlay, in particular the groove forming the notch, must be significantly recessed at least in certain areas so that the sealing ring does not jump out of the groove when the inlay is rotated.

[0022] Multi-component injection molding offers particularly advantageous possibilities for sealing. This is a manufacturing process in plastics technology that is used when a molded part is to be made from two or more plastics. In this case, completely different materials can also be advantageously combined. More specifically, the term multi-component injection molding encompasses various processes, such as sandwich molding and overmolding. In both cases, at least two different melts are combined.

[0023] While two melts are injected simultaneously in the sandwich molding process, "overmolding" is similar to "secondary molding" in that it involves overmolding a previously molded part produced with the first melt with a second melt in a subsequent process step. Depending on the plastics selected, this process can be used to produce so-called hard-soft composites. These typically consist of a relatively hard plastic (here: the inlay) coated with a layer of a relatively soft, elastic material (here: the seal). Machines that perform overmolding are equipped with at least two independently controllable injection units, which, along with the associated control systems, can be designed to suit the respective application.

[0024] A variety of materials can be used for seals, such as EPDM (ethylene propylene diene monomer rubber), FKM (fluororubber), NBR (nitrile rubber), HNBR (hydrogenated nitrile rubber), ACM (acrylate rubber), AEM (ethylene acrylate rubber), FFKM (perfluoroelastomer), butyl rubber, silicone rubber, fluorosilicone rubber, among which thermoplastic elastomers (TPE) in particular can be used in multi-component injection molding processes to achieve overmolding processes.

[0025] Fluoroelastomers, such as those known by the trade name Viton (international material abbreviation: FKM according to DINISO standards), are not TPEs. While relatively expensive, unlike many other elastomers, they are resistant to hydrocarbons such as oils and fuels, even at high temperatures, without swelling or dissolving. Therefore, they offer advantageous sealing properties due to their relatively high heat and chemical resistance. Similar to PTFE, they also have a lower tendency to stick than sealants such as NBR.

[0026] For example, overmolding can be achieved using EPDM-based TPE.

[0027] Alternatively, the polymeric sealing starting material may be cold-injected onto the inlay after the inlay has been manufactured and then vulcanized.

[0028] The basic shape of the circular sealing ring used according to the invention or the seal formed according to the invention in a multi-component injection molding process preferably has a rectangular or at least elliptical contour, wherein this contour is formed on the jacket of the inlay into two axial sealing paths arranged essentially parallel to the longitudinal axis of the inlay and two radial sealing paths (seals) arranged essentially perpendicular to the longitudinal axis of the inlay in projection. Further technical measures of the same or different types can advantageously be provided individually for or within these sealing paths.

[0029] Part of a different design of the sealing track, for example the axial sealing track referred to as the first axial sealing track, can no longer be compressed in the open position due to the geometric design of the inner circumferential surface of the housing, since this part of the seal is arranged in the widening area of ​​the inner contour.

[0030] The other part of the axial sealing track of the seal, referred to as the second axial sealing track, can in this case also be located in the region of the inner wall of the housing having a circular cross-section, wherein compression can also be avoided here when in the open position by arranging its position on the inlay sheath in the housing close to the center axis of the inlay when in the open position, so that it only contacts the housing wall without pressure, or, like the first axial sealing track, is also completely exposed.

[0031] Generally speaking, the advantage of the preferred geometric design is that when the stop valve is in the open state, the seal is not compressed to the greatest extent. Only when the valve is closed will the seal be compressed more and more along its sealing track until it reaches a maximum value when fully closed.

[0032] In this case, the first sealing track is compressed by being guided from the widening region of the housing inner contour to the rounded region of the inner contour, for example by means of a ramp.

[0033] The second sealing path can advantageously form a separate ramp that leads to the sealing surface. In this context, in a preferred embodiment of the invention, it can be advantageously provided that the gap width between the housing and the inlay can also be made variable in the axial direction relative to the longitudinal axis of the inlay by means of the structural geometry of the housing and / or the inlay.

[0034] Around the inlet and, if necessary, the outlet of the housing, the sealing surface, i.e. the gap width between the housing and the inlay, is designed by means of a structural geometric design of the inner circumferential surface of the housing and / or the outer circumferential surface of the inlay, so that when in the closed position the seal around the opening is pressed evenly everywhere.

[0035] In terms of its basic design, the inlay can be designed as a hollow cylinder or hollow cone, in particular, essentially centrally symmetrical with respect to its longitudinal axis. It should be noted that the shut-off valve according to the invention can also be operated with only one seal, which is arranged on the fluid inlet side depending on the application. "Essentially centrally symmetrical in basic design" means that the inlay can, if necessary, have structural details that deviate from this symmetry.

[0036] In order to prevent the inlay from deforming after injection molding, thereby becoming, for example, out of round, it is advantageous to provide two diametrically opposed sealing contours, thereby making the inlay symmetrical.In use, it is then particularly preferred to equip only one of the sealing contours with a seal.

[0037] When installing the shut-off valve according to the invention, the inlay and the housing can be connected by means of a C-shaped connecting element as is known from European Patent EP 1 781 979 B1, for which purpose corresponding radially projecting flange shoulders must be provided on both the inlay and the housing, which are clamped in the installed state by the C-shaped connecting element.

[0038] In this case, mutually corresponding stops can be provided in the flange region, which limit the rotatability of the inlay in the housing to a certain angle, preferably 90°. This prevents the inlay from accidentally moving beyond the open and closed positions, which could lead primarily to damage of the seal, in particular, in the case of the above-described design, to damage of its first axial sealing path.

[0039] A connecting element, such as a spindle, may be provided in or at the housing adjacent to the fluid inlet and / or outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Further advantageous embodiments of the invention are apparent from the following description of the drawings and the associated claims.

[0041] In the attached figure:

[0042] Figure 1 by Figure 2 The cross-sectional view along line II shows a preferred embodiment of the stop valve according to the present invention.

[0043] Figure 2 The shut-off valve according to the present invention is shown. Figure 1 A top view of the preferred embodiment shown,

[0044] Figure 3 by Figure 2 The cross-sectional view of the DD line shows the shut-off valve according to the present invention. Figure 1 and Figure 2 An enlarged version of the embodiment shown in,

[0045] Figure 4 The shut-off valve according to the present invention is shown. Figure 1 and Figure 2 A perspective exploded view of the inlay and the housing half of the illustrated embodiment, wherein the housing half is shown in two different positions,

[0046] Figure 5 by Figure 6 The cross-sectional view along the HH line shows a preferred embodiment of the stop valve according to the present invention.

[0047] Figure 6 A side view of a preferred embodiment shown in the above drawings of a stop valve according to the present invention is shown,

[0048] Figure 7 by Figure 6 The cross-sectional view along line EE shows a preferred embodiment of the stop valve according to the present invention.

[0049] Figure 8 by Figure 6 The cross-sectional view along the CC line shows a preferred embodiment of the stop valve according to the present invention.

[0050] Figure 9 and Figure 10 Shows an enlarged Figure 7 Cross-sectional view without seal,

[0051] Figure 11 Shown is a particularly enlarged Figure 8 The cross-sectional view in FIG. 1 shows the seal without hatching, i.e., it is shown as if it is not compressed.

[0052] Figure 12 A side view of an inlay of a preferred embodiment of a shut-off valve according to the invention is shown, for example as an example Figure 4 The solid body in the right half,

[0053] Figures 13 to 19 according to Figure 12 The sections shown in FIG show different cross-sectional views of the inlay of a preferred embodiment of a shut-off valve according to the invention, in this case in FIG. Figures 16 to 18 Relative to Figure 12 It was magnified.

[0054] Figure 20 shows different common views (perspective view, top view, side view, sectional view) of a first embodiment of a seal of a shut-off valve according to the invention,

[0055] Figure 21 A second embodiment of a seal of a shut-off valve according to the invention, produced in particular by multi-component injection molding, is shown in a perspective view.

[0056] Figures 22 to 24 Include Figure 21 , different views of an inlay of a shut-off valve according to the invention showing a second seal embodiment.

[0057] In the individual figures of the drawings, identical components are always provided with the same reference numerals and are therefore generally only described once unless otherwise required.

[0058] Reference Signs List

[0059] 1. Shut-off valve

[0060] 2 1 inlay

[0061] 3 in 1 shell

[0062] 4 3 Wall

[0063] Entrance in 5 4

[0064] Exit 6 4

[0065] 7 3 for the receiving portion 2

[0066] 8 7 for 2 insertion openings

[0067] 9 7 bottom

[0068] 10 2 through channel

[0069] 11 2 closed wall area

[0070] The entrance to the channel 12 10 corresponds to 5

[0071] 13 10 channel exit, corresponding to 6

[0072] 14 2 sheath

[0073] 15 seals

[0074] 16 The gap between 2 and 3

[0075] 17 3 inner circumferential surface

[0076] 18 2 outer circumferential surface (on 14)

[0077] 19 2 grooves for 15

[0078] 20 The bulge between G and 5 in 4

[0079] 21 17 Transition surface for SY2

[0080] 21a Upper part of 21 (parallel to axis YY)

[0081] 21b The lower part of 21 (inclined toward YY)

[0082] 22 3 connection elements for fluid lines

[0083] 23 Connecting element for 2 and 3

[0084] 24 3 flange shoulder

[0085] 25 2 flange shoulder

[0086] 26 3 stopper for 27

[0087] 27 2 stopper for 26

[0088] 28 2 stopper for 29

[0089] 29 3 stopper for 28

[0090] 30 Button components

[0091] 31 sealing ring

[0092] 32 2 fixed slot for 31

[0093] a The distance between SY2 and YY

[0094] b The distance between SY1 and YY

[0095] Non-circular contours of G 4

[0096] K 4's arc-shaped profile

[0097] R1 is the radius of 17 in region G

[0098] R2 is the radius of 17 in region K

[0099] R3 Radius of 17 in area 20

[0100] Radius of r 15

[0101] Closing direction of rotation for TC 2

[0102] Opening direction of rotation TO 2

[0103] W 16 width

[0104] XX 3's longitudinal axis

[0105] The vertical axis of YY 2 (relative to the horizontal axis of XX) DETAILED DESCRIPTION

[0106] in this case, Figures 1 to 3and 5 to 6 relate to the shut-off valve according to the invention as a whole, Figure 4 and 7 1 to 11 relate to the shut-off valve according to the invention without a housing and an inlay connecting element, Figures 12 to 19 and 23 to 24 relate to inlays (with or without seals), and Figure 20 and 21 Involves unique seals.

[0107] With regard to the following description, the present invention is not limited to the embodiments and therefore not to all or several features of the feature combinations. On the contrary, each individual partial feature of each embodiment is also important for the purpose of the present invention, independently of all other partial features related thereto and also in combination with any feature of another embodiment.

[0108] The above figures show by way of example a shut-off valve 1 according to the invention for a fluid line (not shown), comprising an inlay 2 which is rotationally symmetrical in its basic shape with respect to its longitudinal axis YY, and a housing 3, which has in its wall 4 a fluid inlet 5 and an outlet 6, in particular diametrically opposed to the longitudinal axis XX of the housing 3, as well as a receptacle 7 for the inlay 2, wherein the receptacle 7 has an insertion opening 8 for the inlay 2 (see in particular FIG. Figure 4 ) and a particularly closed bottom 9, wherein the inlay 2 is fixed sealingly in the receptacle 7 of the housing 3 and can be moved about its longitudinal axis in an open position (see in particular Figure 7 and 9 ) and closed position (see in particular Figure 1 、 3 , 8, 10 and 11) and can be detached, wherein the fluid inlet 5 and the outlet 6 in the open position of the inlay 2 are connected to each other via a through-channel 10 of the inlay 2 and are closed by respective (closed) wall areas 11 of the inlay 2 in the closed position of the inlay 2, wherein the through-channel 10 of the inlay 2 has a fluid channel inlet 12 and a channel outlet 13 corresponding to the inlet 5 and outlet 6 of the housing 3 (see in particular Figure 7 ), and wherein at least one seal 15 is arranged on the sheath 14 of the inlay 2 , which seals the gap 16 between the housing 3 and the inlay 2 .

[0109] According to the invention, it is provided that the width W of the gap 16 between the housing 3 and the inlay 2 is variable in the axial and / or circumferential direction relative to the longitudinal axis YY of the inlay 2, that is, by a structural geometric design of the inner circumferential surface 17 of the housing 3 and / or the outer circumferential surface 18 of the inlay 2, wherein, seen in a cross section in the direction of the axis YY of the receptacle 7, the surface(s) 17, 18 are at least regionally non-circular.

[0110] In this case, it can be provided in particular that the housing 7 of the housing 3 has, in a certain area (in which the fluid inlet 5 or outlet 6 opens circumferentially) and in a partial area of ​​its wall 4 adjacent to this area on one or both sides, a circular arc-shaped contour K as seen in a cross section in the axial direction of the housing 7 (see in particular Figure 10 and 11 ).

[0111] In the other intervening partial areas of its wall 4, the housing 7 has a profile G different from a circular arc (see in particular) as viewed in cross section in the direction of the axis YY of the housing 7. Figure 9 and 11 ).

[0112] In this case, a geometric design is preferred, according to which, when viewed in cross section in the direction of the axis YY of the accommodation portion 7, an area G of the inner circumferential surface 17 of the housing 3 is not arc-shaped, and when viewed in cross section in the direction of the axis YY of the accommodation portion 7, an area K of the inner circumferential surface 17 of the housing has an arc-shaped profile, which merge with each other so as to increase the inner diameter of the housing 3, thereby widening the width W of the gap 16 between the housing 3 and the inlay 2 in the rotational direction TO of the inlay 2, which is effective when it is opened.

[0113] The rotation direction TC of the inlay 2, which is effective when closing, and the rotation direction TO of the inlay 2, which is effective when opening, are in the Figure 7 and 8 And 11 is particularly indicated by corresponding arrows.

[0114] In terms of basic design, the inlay 2 can be designed as a hollow cylinder or hollow cone, in particular essentially center-symmetrically with respect to its longitudinal axis YY.

[0115] Arranged on the jacket 14 of the inlay 2 is at least one elastic seal 15 held as a circular sealing ring in a groove 19 of the jacket 14 of the inlay 2, or a seal 15 formed in a multi-component injection molding process. The respective advantages of the different seal embodiments have already been explained above.

[0116] With regard to the groove 19 of the inlay 2, it must be noted that it has the effect of increasing the width W of the gap 16 between the housing 3 and the inlay 2. Figures 9 to 11 16 and 17 , ie in the figures without the seal 15 , the groove 19 is only provided with a reference numeral.

[0117] It should be added here that in the case of a seal 15 formed on the inlay 2 using a multi-component injection molding process, the dimensions of the groove 19 serving as a form-fitting fixing can be kept to an optimally small size, or the groove 19 can be completely omitted, since in this case the seal 15 is adhesively connected to the inlay 2.

[0118] As previously mentioned, the seal 15 may advantageously be made of a thermoplastic elastomer, preferably a fluoroelastomer.

[0119] As especially Figure 20 and 21 As shown, Figure 4 As shown, the basic shape of the seal 15 has a rectangular or at least elliptical contour, wherein this contour is constructed on the sheath 14 of the inlay 2 as two axial sealing tracks SY arranged essentially parallel to the longitudinal axis YY of the inlay 2 and two radial sealing tracks SX arranged essentially perpendicular to the longitudinal axis YY of the inlay 2 in projection.

[0120] exist Figure 7 and Figure 8 In the figure, the two axial sealing tracks SY arranged basically parallel to the longitudinal axis YY of the inlay 2 are further divided into a first axial sealing track SY1, which is located in the widened area of ​​the inner contour of the shell 3 when in the open position, and the widened area is formed in such a way that, as seen from the cross section in the axis YY direction of the accommodating portion 7, the area G of the inner circumferential surface 17 of the shell 3 at this location is not arc-shaped, and a second axial sealing track SY2, which is located in the area K relative to its position on the sleeve 14 of the inlay 2 in the shell 3, and the area has an arc-shaped contour K, as seen from the cross section in the axis YY direction of the accommodating portion 7.

[0121] However, in this case, it is provided that the second axial sealing track SY2, which is characterized by the center of the cross section of the seal 15, is arranged so that its distance a from the center axis YY of the inlay 2 is closer than the distance between the center of the cross section of the first sealing track SY1 and the center axis YY of the inlay 2, so that although the second axial sealing track SY2 is not located in the widened area G, it only contacts the housing wall 4 without pressure, or is exposed to the outside. Figure 9 and Figure 10 This is particularly evident in the enlarged image ( Figure 9 : distance b, Figure 10 : Distance a), the figure does not show the seal 15, but shows the groove 19 in which the seal 15 is arranged.

[0122] The second axial sealing track SY2 is arranged closer to the central axis Y-Y of the insert 2 (a < b), which can preferably be achieved in the following ways: its radius in the insert 2 is smaller than that of the first axial sealing track SY1, such that the corresponding groove 19 of the seal 15 extends radially deeper into the insert 2 than the groove 19 of the first axial sealing track SY1, and / or by the following way: a smaller sealing radius r is selected in the second axial sealing track SY2, as Figures 22 to 24 shown, and for this purpose, a multi-component injection molding process is particularly used to form the seal 15 at the insert 2.

[0123] This may cause the second axial sealing track SY2 to rebound, as Figure 21 and Figure 24 (where it is located on the sheath 14 of the insert 2) shown.

[0124] In this case, the difference b - a can, for example, be between 0.3 mm and 0.5 mm. In particular, the gap 16 can be designed such that the difference b - a is 5 - 15% lower than the minimum pressing degree of the seal 15 at all tolerance positions.

[0125] From the illustration corresponding to Figure 8 it can first be seen that when in the closed position, the first axial sealing track SY1 seals on the circular contour region K of the inner contour of the receiving part 7. The second axial sealing track SY2 seals in a region of the inner contour of the receiving part 7, in which a radially inwardly protruding projection 20 is directly located beside the inlet 5 in the wall 4, which separates the inlet 5 (or the outlet 6 on the other side) from the region G of the wall 4 (including a non-circular arc contour). In the region of the radially inwardly protruding projection 20, the inner circumferential surface 17 of the housing 3 can preferably be designed as an arc. Therefore, the sealing surfaces around the openings 5, 6 of the housing 3 are designed such that when in the closed position, the surrounding seal 15 is pressed approximately evenly everywhere.

[0126] In addition, Figure 11 the preferred geometric design of the inner circumferential surface 17 of the housing 3 and the outer circumferential surface 18 of the insert 2 including the seal 15 is also shown in summary. It can be generally shown as follows:

[0127] - a = the distance of the second axial sealing track SY2 from the central axis Y-Y of the valve body 2

[0128] - r = the radius of the seal 15

[0129] - b > a (as described above)

[0130] - R1 > b + r (the radius of 17 in the region G, where R1 continuously increases from the starting point to the end point of the continuously widening region G) ​​

[0131] -R2 > a + r (radius of 17 in region K)

[0132] -R2 < b + r

[0133] -R3 < a + r (R3 = radius in region 20)

[0134] In particular, the following formula applies to seals with a sealing cord thickness of 1.5 mm:

[0135] R1 = 0.3 mm to 0.5 mm + R2,

[0136] R2 = 0.3 mm to 0.5 mm + R3.

[0137] In addition to making a circumferential change to the geometry of the shut-off valve 1 according to the invention to change the clearance width W, in a preferred embodiment it can also be arranged that the width W of the clearance 16 between the housing 3 and the insert 2 can also be made variable in the axial direction with respect to the longitudinal axis Y-Y of the insert 2 by means of a structural geometric design of the housing 3 and / or the insert 3.

[0138] Thereby, a contour with a transition surface 21 for guiding the second sealing track SY2 to the sealing surface can be provided at the projection 20 in the housing 3, as Figure 4 shown in the left-hand part, such that when the insert moves to the closed position, the second axial sealing track SY2 does not immediately contact the projection 20 in the wall 4 of the housing 3 that forms a ramp leading to the sealing surface over its entire length. This transition surface can consist of a part 21a parallel to the axis Y-Y and a part 21b that intersects it obliquely and converges towards the bottom. This advantageously causes the second axial sealing track SY2 to initially only contact the projection 20 in the lower part, i.e., in a small area near the bottom 9, and then this small area gradually becomes larger until shortly before reaching the closed position, the remaining part of the second axial sealing track SY2 that was initially not pressed also contacts the part 21a parallel to the axis Y-Y that contacts the projection 20 in the upper part, i.e., in the region of the insertion opening 8 of the insert 2.

[0139] The seal 25 is preferably non-contact before completely passing over the inlet 5 and the outlet 6, so that it is not damaged by burrs or sharp edges at the opening edges.

[0140] Figures 13 to 19 in various cross-sectional views (where cross-section F-F( Figure 16 ) and J-J( Figure 18 ) and cross-section G-G( Figure 16 ) and M-M( Figure 19) are located in the same plane, once without a seal and once with a seal 15 ) show that, with regard to the geometric design of the inlay, the inlay 2 can also be constructed in a different manner along its longitudinal axis YY, for example relative to the groove 19 in its outer circumferential surface 18 .

[0141] Depending on the purpose, a connecting element 22 , such as a mandrel, is provided in or on the housing 3 adjacent to the fluid inlet 5 and / or outlet 6 .

[0142] The inlay 2 and the housing 3 can preferably be connected via a C-shaped connecting element 23 , for which purpose corresponding radially projecting flange shoulders 24 , 25 are provided on both the inlay 2 and the housing 3 , which are clamped by the C-shaped connecting element 23 in the installed state.

[0143] In European Patent EP 1 781 979 B1, which relates to a plug-in connection for fluid lines, such a C-shaped connecting element 23 is known as a fixing element. In this case, it is provided that the plug-in connection comprises a locking device with two coupling parts that can be plugged together and that can be releasably locked in the plugged-in state by the locking device, wherein the locking device comprises, on the one hand, two outer, radial, flange-shaped fixing plates of the two coupling parts, which, in the plugged-in state, are axially adjacent in the plugging direction with the same diameter, and, on the other hand, a fixing element, which surrounds the axially adjacent fixing plates of the two coupling parts axially and radially in a form-fitting manner via at least one fixing portion that is C-shaped in axial cross-section, wherein the fixing element is designed and one of the two coupling parts is captively pre-assembled on the fixing element in such a way that the fixing element is, on the one hand, fixed in the axial and radial directions and, on the other hand, is radially elastically displaceable in the region of each fixing portion, wherein the fixing element and the fixing plate of the other coupling part in the region of each fixing portion are designed to cooperate with each other to form a form-fitting locking connection in the plugging direction.

[0144] For more possible designs of the connecting element 23, please refer to European Patent EP 1781 979B1 in detail. For example, Figure 2 and Figure 6 The button element 30 described therein is shown as an optional feature for securing against loss.

[0145] If special Figure 5 As shown, on the inlay 2 and the housing 3, in particular in the region of their flange shoulders 24, 25, mutually corresponding stops 26, 27 and 28, 29 can be formed, which limit the rotatability of the inlay 2 in the housing 3 to an angle, preferably 90°, during opening and closing.

[0146] Finally, it must also be provided that, depending on the purpose, the inlay 2 can be sealed relative to the housing 3 near the insertion opening 8 by a seal 31 (or a corresponding seal formed using a multi-component injection molding process) which completely surrounds the inlay 2. For this purpose, a fixing groove 32 can be provided in the inlay 2.

[0147] The present invention is not limited to the exemplary embodiments shown and described, but also includes all embodiments having the same effect within the meaning of the present invention. It is expressly emphasized that the exemplary embodiments are not limited to all combinations of features, but rather each individual sub-feature can have inventive significance in itself, even independently of all other sub-features. Furthermore, the present invention is not limited to the combination of features defined in claim 1, but can also be defined by any other combination of certain features of all the individual features disclosed as a whole. This means that, in principle, virtually every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the present application.

Claims

1. A shut-off valve (1) for a fluid line, comprising an inlay (2) which is rotationally symmetrical in its basic shape with respect to its longitudinal axis (YY), and a housing (3) having a fluid inlet (5) and an outlet (6) and a receptacle (7) for the inlay (2) in its wall (4), wherein: The receiving portion (7) has an insertion opening (8) for the inlay (2) and a bottom (9), wherein the inlay (2) is fixed in a sealing manner in the receiving portion (7) of the housing (3) and can be rotated about its longitudinal axis (YY) between an open position and a closed position and can be removed, wherein the fluid inlet (5) and the outlet (6) in the open position of the inlay (2) are connected to each other via a through-channel (10) of the inlay (2) and are closed by respective wall areas (11) of the inlay (2) in the closed position of the inlay (2), wherein the through-channel (10) of the inlay (2) has a fluid channel inlet (12) and a channel outlet (13) corresponding to the inlet (5) and the outlet (6) of the housing (3), and wherein at least one seal (15) is arranged on the jacket (14) of the inlay (2), which seal seals a gap (16) between the housing (3) and the inlay (2), Characterized in that the width (W) of the gap (16) between the housing (3) and the inlay (2) is set to be variable in the axial and / or circumferential direction relative to the longitudinal axis (YY) of the inlay (2), that is, it is achieved by a structural geometric design of the inner circumferential surface (17) of the housing (3) and / or the outer circumferential surface (18) of the sleeve (14) of the inlay (2), wherein, viewed from a cross section in the direction of the axis (YY) of the receiving portion (7), the surface (17, 18) is at least regionally non-circular (K).

2. The stop valve (1) according to claim 1, It is characterized in that The receiving portion (7) of the housing (3) has an arc-shaped profile (K) in a certain area (in which the fluid inlet (5) or the outlet (6) merges circumferentially) and in a partial area of ​​its wall (4) adjacent to the area on one side or both sides, when viewed from a cross section in the direction of the axis (YY) of the receiving portion (7).

3. The stop valve (1) according to claim 1 or 2, It is characterized in that In a partial area of ​​its wall (4), the receiving portion (7) of the housing (3) has a profile (G) different from a circular arc shape, as seen from a cross section in the direction of the axis (YY) of the receiving portion (7).

4. The stop valve (1) according to claim 2 and 3, It is characterized in that When viewed from a cross section in the direction of the axis (YY) of the accommodating portion (7), an area (G) of the inner circumferential surface (17) of the shell (3) is not arc-shaped, and when viewed from a cross section in the direction of the axis (YY) of the accommodating portion (7), an area (K) of the inner circumferential surface (17) of the shell (3) has an arc-shaped contour, which merge with each other to increase the inner diameter of the shell (3), thereby widening the width (W) of the gap (16) between the shell (3) and the inlay (2) in the rotation direction (TO) of the inlay (2) that takes effect when it is opened.

5. The stop valve (1) according to any one of claims 1 to 4, It is characterized in that At least one elastic seal (15) is arranged on the sleeve (14) of the inlay (2) and is held in a groove (19) of the inlay as a circular sealing ring, or a seal (15) formed by a multi-component injection molding process.

6. The stop valve (1) according to any one of claims 1 to 5, It is characterized in that The seal (15) is made of EPDM (ethylene propylene diene monomer rubber), FKM (fluororubber), NBR (nitrile rubber), HNBR (hydrogenated nitrile rubber), ACM (acrylate rubber), AEM (ethylene acrylate rubber), FFKM (perfluoroether rubber), butyl rubber, silicone rubber, fluorosilicone rubber, in particular, made of thermoplastic elastomer, preferably made of fluoroelastomer.

7. The stop valve (1) according to any one of claims 1 to 6, It is characterized in that The basic shape of the seal (15) has a rectangular or at least elliptical contour, wherein the contour is configured on the sleeve (14) of the inlay as two axial sealing tracks (SY) arranged essentially parallel to the longitudinal axis (YY) of the inlay (2) and two radial sealing tracks (SX) arranged essentially perpendicular to the longitudinal axis (YY) of the inlay (2) in projection.

8. The stop valve (7) according to claim 1, It is characterized in that When in the open position, the first axial sealing track (SY, SY1) is located in the widened area of ​​the inner contour of the housing (3), and the second axial sealing track (SY, SY2) is arranged relative to its position on the sleeve (14) of the inlay in the housing (3) to be closer to the center axis (YY) of the inlay (2) than the first sealing track (SY1), so that it only contacts the housing wall (4) without pressure or is exposed to the outside.

9. The shut-off valve (1) according to any one of claims 1 to 8, It is characterized in that By means of the structural geometric design of the housing (3) and / or the inlay (2), the width (W) of the gap (16) between the housing (3) and the inlay (2) is set to be variable in the axial direction relative to the longitudinal axis (YY) of the inlay (2).

10. The shut-off valve (1) according to any one of claims 1 to 9, It is characterized in that In terms of basic design, the inlay (2) is designed as a hollow cylinder or hollow cone, in particular, is designed essentially center-symmetrically with respect to its longitudinal axis (YY).

11. The stop valve (1) according to any one of claims 1 to 10, It is characterized in that A connecting element (22), such as a mandrel, is arranged in or at the housing (3) adjacent to the fluid inlet (5) and / or the outlet (6).

12. The shut-off valve (1) according to any one of claims 1 to 11, It is characterized in that The inlay (2) and the housing (3) are connected via a C-shaped connecting element (23). For this purpose, corresponding radially protruding flange shoulders (24, 25) are provided on the inlay (2) and the housing (3). In the installed state, the flange shoulders are clamped by the C-shaped connecting element (23).

13. The shut-off valve (1) according to any one of claims 1 to 12, in particular according to claim 12, It is characterized in that At the inlay (2) and the housing (3), in particular in the region of the flange shoulders (24, 25), mutually corresponding stops (26 / 27, 28 / 29) are formed which limit the rotatability of the inlay (2) in the housing (3) between an open position and a closed position to an angle, preferably an angle of 90°.

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