Diaphragm valve

Abstract

A diaphragm valve (10) has an axially driven valve shaft (12), a thrust member (14) and a diaphragm (16) including a diaphragm body (18) associated with the thrust member (14) and a diaphragm membrane (24) associated with a valve seat. The valve shaft (12) is drivingly coupled to a diaphragm body (18) by means of a thrust member (14), the diaphragm body (18) being axially arranged between the thrust member (14) and a diaphragm membrane (24). Here, the membrane film (24) has an elastic modulus of at least 1000 MPa.

Description

Technical Field

[0001] The invention relates to a diaphragm valve having an axially driven valve shaft, in particular for closing off a liquid. Background Art

[0002] Diaphragm valves of this type are known.

[0003] The requirements placed on the diaphragms of these valves, in particular with regard to the material from which the diaphragms are made, frequently change due to regulations or statutory provisions.

[0004] Typically, these diaphragms are made of a material with a low modulus of elasticity or elastic modulus (eg 30 MPa) to ensure a good sealing effect and a long useful life or a high number of operating cycles. Summary of the invention

[0005] It is an object of the present invention to provide a diaphragm valve having an efficient diaphragm which can be made from a wide range of materials.

[0006] The object is achieved by a diaphragm valve having an axially driven valve shaft, a thrust piece and a diaphragm, the diaphragm comprising a diaphragm body associated with the thrust piece and a diaphragm membrane associated with a valve seat. The valve shaft is drivingly coupled to the diaphragm body by means of the thrust piece, the diaphragm body being axially arranged between the thrust piece and the diaphragm membrane. In addition, the diaphragm membrane has an elastic modulus or elastic modulus of at least 1000 MPa.

[0007] According to the invention it has been found that in this way at least the section of the diaphragm which is in fluid contact during operation, ie in the form of the diaphragm film, can be formed from a variety of materials, in particular materials with a high elastic modulus, which are not considered for production in conventional diaphragms.

[0008] According to one aspect of the invention, the diaphragm film has an elastic modulus of at most 10000 MPa, preferably at most 5000 MPa, so that the diaphragm film has a certain minimum degree of elasticity.

[0009] Diaphragm valves are in particular process valves.

[0010] Furthermore, the diaphragm valve is configured in particular to close and open a liquid, ie the medium is preferably a liquid.

[0011] In one embodiment, the diaphragm film includes or consists of at least one of the following materials: polyetheretherketone (PEEK), cyclic olefin copolymer (COC).

[0012] Additionally or alternatively, the diaphragm body may be formed from an elastomer, such that at least a thicker section of the diaphragm has a high elasticity.

[0013] Furthermore, it can be provided that the diaphragm membrane comprises a fastening section and a fluid contact section having a sealing section and an expansion section. The expansion section extends at least partially between the sealing section and the fastening section in order to ensure a long service life of the diaphragm.

[0014] In particular, the fastening section here provides a seal which separates the medium from the environment during operation.

[0015] Furthermore, the fastening section may be a flange surrounding the fluid contact section.In this way, the number of operating cycles for which the diaphragm is designed can be further increased.

[0016] In another embodiment, the wall thickness of the entire expansion section is between 0.05 mm and 0.8 mm. The expansion section here is in particular the section of the diaphragm film that deforms elastically when the valve shaft is adjusted. As a result, on the one hand, the expansion section is thin enough to deform elastically with little force, and on the other hand, the expansion section is thick enough to contribute to a long service life. In addition, such a small wall thickness allows relatively large lift forces to be achieved.

[0017] According to one embodiment, the fluid contact section is a circular area. Thus, the diaphragm membrane has a geometry that contributes to a longer service life.

[0018] Furthermore, it can be provided that the expansion section comprises at least one pressure relief section with an undulating cross section, in particular in the unloaded state of the diaphragm. The unloaded state here refers to a state in which the diaphragm or the diaphragm is not installed and is not significantly deformed by external forces. This design has the advantage that the diaphragm can withstand particularly many operating cycles, so that the diaphragm valve has a long useful life.

[0019] In this respect, at least one decompression section can have a wavy cross section at least partially in a radial direction relative to the center of the area of ​​the fluid contact section or relative to the midpoint of the lateral line of the sealing section. This means that at least one decompression section is at least partially made rotationally symmetrical relative to the center of the area of ​​the fluid contact section or the midpoint of the lateral line of the sealing section. This facilitates elastic deformation of the expansion section, which ensures a longer service life.

[0020] According to another embodiment, at least one decompression section has a wavy cross section at least partially in a circumferential direction relative to the center of the area of ​​the fluid contact section or relative to the midpoint of the side line of the sealing section. This means that at least one decompression section has at least partially one or more wave crests and / or wave troughs which extend radially outwards from the center of the area of ​​the fluid contact section or from the midpoint of the side line of the sealing section or towards the fastening section. This design can increase the service life of the diaphragm membrane because it promotes elastic deformation of the expansion section.

[0021] Furthermore, in one embodiment, the sealing section can extend from one side of the fastening section to the radially opposite side of the fastening section, in particular straight, in order to ensure a particularly high sealing effect when the diaphragm membrane rests against the sealing web or web-shaped valve seat by means of the sealing section.

[0022] In another embodiment, the sealing segment has at least one sealing pressure relief segment in order to promote elastic deformation of the sealing segment.

[0023] In this respect, at least one sealing pressure relief section can be designed to be complementary to at least one pressure relief section. In this way, the sealing pressure relief section and the pressure relief section are matched to each other so that the diaphragm membrane can withstand a particularly large number of operating cycles.

[0024] According to another embodiment, the valve shaft is axially adjustable between a first position, in which the valve seat of the diaphragm valve is closed, and a second position, in which the valve seat is open. Here, the diaphragm is designed such that the diaphragm membrane is in an axially unloaded state in an axial position between the first and second positions of the valve shaft. In this way, the maximum expansion of the diaphragm membrane is smaller than in embodiments in which the diaphragm membrane is in an axially unloaded state in the first position or in the second position of the valve shaft. Thus, a larger expansion is avoided, which could largely impair the service life of the diaphragm membrane.

[0025] In particular, the diaphragm can be designed here so that the diaphragm film is in an axially unloaded state in an axially central position between the first and second positions of the valve shaft. By selecting the axially central position of the axially unloaded state, the maximum load is only 50%. In other words, this means that the diaphragm film is expanded in both the first and second positions of the valve shaft, but only by half the distance compared to an embodiment in which the diaphragm film is not expanded in either the first or second position.

[0026] In an alternative embodiment, the valve shaft is axially adjustable between a first position, in which the valve seat of the diaphragm valve is closed, and a second position, in which the valve seat is open. Here, the diaphragm is designed such that it rolls from the first position toward the second position and vice versa, i.e. the diaphragm rolls from the second position toward the first position. In this way, the diaphragm is designed at least partially as a rolling diaphragm and thus has a particularly long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Further advantages and features will become apparent from the following description and accompanying drawings, in which:

[0028] Figure 1 shows a perspective partial cross-sectional view of a diaphragm valve according to the invention, the diaphragm valve having a diaphragm and a thrust piece;

[0029] Figure 2 a longitudinal cross-sectional view of a fluid housing showing fluid flow therethrough, and Figure 1 a diaphragm and a thrust member of a diaphragm valve in an open position of the diaphragm valve;

[0030] Figure 3 The first embodiment of the present invention is shown Figure 1 A bottom view of the diaphragm film of the diaphragm;

[0031] Figure 4 Shown by Figure 3 A cross-sectional view taken along the plane N–N in FIG.

[0032] Figure 5 The second embodiment of the present invention is shown Figure 1 A bottom view of the diaphragm film of the diaphragm;

[0033] Figure 6 Shown by Figure 5 A cross-sectional view taken along the plane N–N in FIG.

[0034] Figure 7 The third embodiment of the present invention is shown. Figure 1 A bottom view of the diaphragm film of the diaphragm;

[0035] Figure 8 Shown by Figure 7 A cross-sectional view taken along the plane N–N in FIG.

[0036] Fig. 9 The fourth embodiment of the present invention is shown. Figure 1 A bottom view of the diaphragm film of the diaphragm;

[0037] Fig.10 Shown by Fig. 9 A cross-sectional view taken along the plane N–N in FIG.

[0038] Fig.11 The fifth embodiment of the present invention is shown. Figure 1 A bottom view of the diaphragm film of the diaphragm;

[0039] Fig.12 Shown by Fig.11 A cross-sectional view taken along the plane N–N in FIG.

[0040] Fig.13 The sixth embodiment of the present invention is shown. Figure 1 A bottom view of the diaphragm film of the diaphragm;

[0041] Fig.14 Shown by Fig.13 A cross-sectional view taken on the curved cross-sectional surface O–O in FIG. 1 ; and

[0042] Fig.15 According to another embodiment Figure 1 A cross-sectional view of a diaphragm valve of the embodiment of the present invention is shown in FIG. 1 with the diaphragm of the diaphragm valve in a closed position of the diaphragm valve. DETAILED DESCRIPTION

[0043] Figure 1 A diaphragm valve 10 is shown, comprising a valve shaft 12 having a longitudinal axis L, a thrust piece 14 and a diaphragm 16 .

[0044] The diaphragm 16 has a diaphragm body 18 with a resilient circular central portion 20 which is drivingly coupled to the valve shaft 12 by means of the thrust piece 14 and a clamping flange 22 which radially delimits the central portion 20 .

[0045] Furthermore, the diaphragm 16 has a diaphragm membrane 24 which includes a circular fluid contact section 26 (see Figure 3 ), the circular fluid contact section having a central sealing section 28 and a fastening section 30 which radially delimits the fluid contact section 26 and forms a flange 32.

[0046] The diaphragm 16 (in particular the diaphragm body 18 and / or the diaphragm film 24) can be designed at least partially as a rolling diaphragm 25 (see Fig.15 ).

[0047] The diaphragm valve 10 also has an actuator 34 (see Figure 1 ), which is fastened to a fluid housing 36 having a valve opening 38 and a web-shaped valve seat 40 (see Figure 2 )superior.

[0048] Drive 34 only Figure 1 It is shown schematically in FIG, and can be a hydraulic, pneumatic or electric drive.

[0049] For example, the driver 34 is a pre-assembled stand-alone unit.

[0050] In this respect, the diaphragm 16 is axially clamped between a flange section 42 of the driver 34 and a flange section 44 of the fluid housing 36 by means of the clamping flange 22 and the fastening section 30 .

[0051] Here, the sealing section 28 is arranged opposite to the valve seat 40 .

[0052] Furthermore, the diaphragm membrane 24 seals the valve opening 38 in a fluid-tight manner.

[0053] The fastening section 30 here forms a seal in the form of a sealing bead.

[0054] In order to ensure a particularly strong sealing effect, the diaphragm film 24 comprises an annular sealing bead 46 at the transition between the fastening section 30 and the fluid contact section 26 (see Figure 3 ).

[0055] In alternative embodiments, the sealing bead 46 may be omitted.

[0056] To actuate the diaphragm valve 10, the valve shaft 12 is moved axially up and down by means of the drive 34 in order to axially raise or lower the diaphragm 16 and thus press it against the valve seat 40. In this way, the corresponding conduit 48 (see Figure 2 )'s flow cross section can be opened to a greater or lesser extent.

[0057] The valve shaft 12 is here axially adjustable between a first position 50 in which the sealing section 28 rests tightly against the valve seat 40 , completely closing the valve seat, and a second position 52 in which the valve seat 40 is completely open, ie the flow cross section is maximum.

[0058] Thus, the first position 50 constitutes an open position of the diaphragm valve 10 , whereas the second position 52 constitutes a closed position of the diaphragm valve 10 .

[0059] The diaphragm valve 10 is constructed so that the diaphragm 16 can be replaced in the event of a malfunction of the diaphragm 16 .

[0060] In this embodiment, the valve shaft 12 is adapted to be coupled to and decoupled from the diaphragm 16 in a non-destructive manner via the thrust piece 14, and preferably without the use of tools. This coupling and decoupling is performed without disassembling the actuator 34. For disassembly, the actuator 34 need only be removed from the fluid housing 36. After the actuator 34 is removed from the fluid housing 36, the diaphragm 16 can then be replaced.

[0061] refer to Figure 3 and Figure 4 The structure of the diaphragm 16 (particularly the structure of the diaphragm film 24) will be described in more detail below.

[0062] The diaphragm body 18 is made of elastomer.

[0063] In alternative embodiments, diaphragm body 18 may be formed from any desired elastomeric material, such as ethylene propylene diene monomer (EPDM), PEEK, or COC.

[0064] The diaphragm film 24 consists of PEEK and has an elastic modulus of 3600 MPa. The present concept is not intended to be restricted to this exemplary embodiment.

[0065] Basically, the diaphragm film 24 can consist of any desired material having an elastic modulus between 1000 MPa and 10000 MPa, for example COC or a composite material or material combination containing PEEK and / or COC.

[0066] In one embodiment, the elastic modulus of the diaphragm body 18 is smaller than the elastic modulus of the diaphragm film 24 by more than 10 times, in particular, by more than 100 times.

[0067] The fluid contacting section 26 has two expansion sections 54 , each of which extends between the sealing section 28 and the fastening section 30 and is elastically deformed when the diaphragm valve 10 is adjusted from the open position to the closed position and vice versa.

[0068] The sealing section 28 passes through the center M of the region of the fluid contact section 26 in the form of a straight line from one side of the fastening section 30 to the opposite side of the fastening section 30 .

[0069] In this case, the two expansion sections 54 are designed mirror-symmetrically with respect to the sealing section 28 , although this may be different in alternative embodiments.

[0070] The expansion sections 54 each have a wall thickness W1 of 0.4 mm.

[0071] In principle, the expansion sections 54 can each have any desired wall thickness W1 , preferably a wall thickness W1 in the range of 0.05 mm to 0.8 mm.

[0072] The fastening section 30 may have a wall thickness W2 that is equal to or greater than the wall thickness W1 of the expansion section 54 .

[0073] The sealing section 28 may have a wall thickness W3 that is equal to or greater than the wall thickness W1 of the expansion section 54 .

[0074] In the exemplary embodiment shown, the sealing section 28 has a sealing bead 56 which has a wall thickness W3 of 1 mm.

[0075] Basically, the wall thickness W3 of the sealing bead 56 can be of any desired dimension.

[0076] In an alternative embodiment, the sealing section 28 is devoid of the sealing bead 56 .

[0077] In one embodiment, the wall thickness of the entire diaphragm film 24 or each section of the diaphragm film 24 is in the range of 0.05 mm to 0.8 mm.

[0078] To reduce stress or loads in the fluid contacting section 26 that occur during the operating cycle between the first position 50 and the second position 52, the diaphragm membrane 24 may include a Figures 5 to 14 Further structure of the discussion.

[0079] refer to Figure 5 and Figure 6 , a diaphragm membrane 24 according to a second embodiment will now be described. The same reference numerals will be used for components or sections known from the above-described embodiments, and in this respect reference is made to the previous discussion.

[0080] and Figure 3 and Figure 4 Unlike the illustrated embodiment, each expansion section 54 comprises a pressure relief section 58 which, in the unloaded state of the diaphragm film 24, has a corrugated cross section (see Figure 6 ).

[0081] Here, the waveforms of the two pressure relief sections 58 extend in concentric circles around the center M of the region (see Figure 5 ), and radially away from the center M of the area in the cross section.

[0082] Figure 6 The lines in the bottom view of represent the profile of the troughs and peaks of the relief section 58 in a plane perpendicular to the longitudinal axis L.

[0083] refer to Figure 7 and Figure 8 , a diaphragm membrane 24 according to a third embodiment will now be described. The same reference numerals will be used for components or sections known from the above embodiments, and in this respect reference is made to the previous discussion.

[0084] and Figure 3 and Figure 4 Unlike the illustrated embodiment, each expansion section 54 includes an inner pressure relief section 60 and an outer pressure relief section 62 that are radially separated from one another by a planar section 64 .

[0085] In the unloaded state of the diaphragm film 24, the inner pressure relief section 60 and the outer pressure relief section 62 each have a corrugated cross section (see Figure 8 ).

[0086] Here, the waveforms of the pressure relief sections 60, 62 extend in concentric circles around the center M of the region (see Figure 7 ), and radially away from the center M of the area in the cross section.

[0087] refer to Fig. 9 and Fig.10 , a diaphragm membrane 24 according to a fourth embodiment will now be described. The same reference numerals will be used for components or sections known from the above embodiments, and in this respect reference is made to the previous discussion.

[0088] and Figure 5 and Figure 6 In contrast to the exemplary embodiment shown, the sealing section 28 is of rectangular or strip-shaped design and has a width B.

[0089] Furthermore, in this exemplary embodiment, the sealing section 28 has no sealing bead 56 .

[0090] refer to Fig.11 and Fig.12 , a diaphragm membrane 24 according to a fifth embodiment will now be described. The same reference numerals will be used for components or sections known from the above embodiments, and in this respect reference is made to the previous discussion.

[0091] and Figure 5 and Figure 6 Unlike the illustrated embodiment, the sealing section 28 is of rectangular or strip-shaped design and has a width B and comprises two sealing relief sections 66 which are designed to complement the relief sections 58 .

[0092] The pressure relief section 58 and the sealing pressure relief section 66 form a D-shaped corrugated structure (see Fig.11 ), which extends concentrically around the center of the semicircular area F of the fluid contact section 26.

[0093] refer to Fig.13 and Fig.14 , a diaphragm membrane 24 according to a sixth embodiment will now be described. The same reference numerals will be used for components or sections known from the above embodiments, and in this respect reference is made to the previous discussion.

[0094] and Figure 3 and Figure 4 In contrast to the exemplary embodiment shown, the sealing section 28 is of rectangular or strip-shaped design and has a width B.

[0095] Furthermore, each expansion section 54 comprises a pressure relief section 68 which, in the unloaded state of the diaphragm film 24, has a corrugated cross section in the circumferential direction U around the midpoint S of the lateral line 70 of the sealing section 28 (see Fig.14 ).

[0096] The expansion section 54 may additionally include a pressure relief section 58 that extends radially away from one of the center M or the midpoint S of the region in cross section.

[0097] Basically, all the pressure relief sections 58 , 60 , 62 , 68 and the sealing pressure relief section 66 can be combined with one another as desired.

[0098] Furthermore, all of the pressure relief sections 58 , 60 , 62 , 68 and the sealing pressure relief section 66 may each be designed individually, in particular with regard to the amplitude and frequency of their fluctuations.

[0099] In particular, the diaphragm membrane 24 includes pressure relief sections 58 , 60 , 62 , 68 and / or a sealing pressure relief section 66 in portions of the fluid contact section 26 that are subject to particularly high loads during an operating cycle.

[0100] Preferably, the pressure relief sections 58 , 60 , 62 , 68 and / or the sealing pressure relief section 66 are designed such that these loads are reduced in a targeted manner in order to increase the service life or useful life of the diaphragm 16 .

[0101] To this end, the method for manufacturing the diaphragm 16 may include a step in which, in an actual test, a diaphragm film 24 without a pressure relief section 58, 60, 62, 68 and / or a sealed pressure relief section 66 is first used in the diaphragm valve 10 for a certain number of operating cycles, and in a subsequent step, the diaphragm film 24 is designed to include a pressure relief section 58, 60, 62, 68 and / or a sealed pressure relief section 66, which purposefully compensates for or at least reduces the stress generated in the actual test.

[0102] In order to form the pressure relief sections 58 , 60 , 62 , 68 and / or to seal the pressure relief section 66 , the diaphragm film 24 is thermoplastically deformed.

[0103] In one embodiment, the diaphragm 16 is configured such that when the diaphragm membrane 24 is in an axially centered position 72 (see FIG. Figure 2 ), it is in a state where the stress or load on the diaphragm film 24 is minimal.

[0104] In all embodiments, similar to the diaphragm membrane 24 , the diaphragm body 18 , and particularly the center portion 20 , may include pressure relief sections 58 , 60 , 62 , 68 and / or a sealed pressure relief section 66 .

[0105] Furthermore, the diaphragm body 18 is connected to the diaphragm membrane 24 by means of a material-to-material bond, a press fit and / or a form fit.

[0106] Here, the diaphragm film 24 may be connected to the diaphragm body 18 over its entire surface or partially.

[0107] Preferably, the diaphragm membrane 24 is fastened to the diaphragm body 18 at least in the center M of the area.

[0108] In one embodiment, the diaphragm membrane 24 is connected to the diaphragm body 18 by means of the sealing section 28 and the fastening section 30 , whereas the expansion section 54 is not fastened to the diaphragm body 18 and is in particular freely elastically deformable therein.

[0109] In a further embodiment, the membrane 16 is laminated. In this process, the components are first lightly etched, then treated with an adhesive, and in a final step they are heat pressed together.

[0110] This can be done over the entire surface or only in sections, for example by applying an adhesive via a mask or a matrix.

[0111] In an alternative embodiment, the components are connected to each other using suitable plug connections, for example by means of metal pins.

[0112] In this way, a diaphragm valve 10 is provided which has a diaphragm 16 which is at least partially formed from a material having a high modulus of elasticity and which at the same time has a long useful life.

[0113] The invention is not limited to the embodiments shown. In particular, individual features of one embodiment can be combined with features of other embodiments as required, in particular independently of other features of the individual embodiments.

Claims

1. A diaphragm valve (10), comprising an axially driven valve shaft (12), a thrust piece (14) and a diaphragm (16), wherein the diaphragm comprises a diaphragm body (18) associated with the thrust piece (14) and a diaphragm film (24) associated with a valve seat (40), wherein the valve shaft (12) is drivingly connected to the diaphragm body (18) by means of the thrust piece (14), the diaphragm body (18) is axially arranged between the thrust piece (14) and the diaphragm film (24), wherein the diaphragm film (24) has an elastic modulus of at least 1000 MPa.

2. The diaphragm valve (10) according to claim 1, characterized in that: The diaphragm film (24) includes or consists of at least one of polyetheretherketone and cycloolefin copolymer.

3. The diaphragm valve (10) according to claim 1 or 2, characterized in that: The diaphragm body (18) is formed of an elastomer.

4. The diaphragm valve (10) according to any one of the preceding claims, characterized in that The diaphragm film (24) comprises a fastening section (30) and a fluid contact section (26) having a sealing section (28) and an expansion section (54), wherein the expansion section (54) extends at least partially between the sealing section (28) and the fastening section (30).

5. The diaphragm valve (10) according to claim 4, characterized in that: The fastening section (30) is a flange (32) surrounding the fluid contact section (26).

6. The diaphragm valve (10) according to claim 4 or 5, characterized in that: The wall thickness (W1) of the entire expansion section (54) is between 0.05 mm and 0.8 mm.

7. The diaphragm valve (10) according to any one of claims 4 to 6, characterized in that: The fluid contact section (26) is a circular area.

8. The diaphragm valve (10) according to any one of claims 4 to 7, characterized in that: The expansion section (54) includes at least one pressure relief section (58, 60, 62, 68) having a corrugated cross-section.

9. The diaphragm valve (10) according to any one of claims 4 to 7, characterized in that: The expansion section (54) includes at least one pressure relief section (58, 60, 62, 68) which has a corrugated cross section in an unloaded state of the diaphragm film (24).

10. The diaphragm valve (10) according to claim 8 or 9, characterized in that: The at least one pressure relief section (58, 60, 62) has a wavy cross section at least partially in a radial direction relative to a center (M) of the area of ​​the fluid contact section (26) or relative to a midpoint (S) of a lateral line (70) of the sealing section (28).

11. The diaphragm valve (10) according to any one of claims 8 to 10, characterized in that: The valve shaft (12) is axially adjustable between a first position (50) and a second position (52), in which the valve seat (40) of the diaphragm valve (10) is closed and in which the valve seat (40) is open, and the diaphragm (16) is designed so that the diaphragm film (24) is in an axially unloaded state in an axial position between the first position (50) and the second position (52) of the valve shaft (12).

12. The diaphragm valve (10) according to claim 11, characterized in that The diaphragm (16) is designed such that the diaphragm film (24) is in an axially unloaded state in an axially central position (72) between a first position (50) and a second position (52) of the valve shaft (12).

13. The diaphragm valve (10) according to any one of claims 8 to 10, characterized in that: The valve shaft (12) is axially adjustable between a first position (50) and a second position (52), in which the valve seat (40) of the diaphragm valve (10) is closed, and in which the valve seat (40) is open, and the diaphragm (16) is designed so that it rolls from the first position (50) to the second position (52) and vice versa.

14. The diaphragm valve (10) according to any one of claims 8 to 13, characterized in that: The at least one pressure relief section (68) has a wavy cross section at least partially in a circumferential direction (U) relative to a center (M) of a region of the fluid contact section (26) or relative to a midpoint (S) of a lateral line (70) of the sealing section (28).

15. The diaphragm valve (10) according to any one of claims 8 to 14, characterized in that The sealing section (28) extends from one side of the fastening section (30) to a radially opposite side of the fastening section (30).

16. The diaphragm valve (10) according to claim 15, characterized in that The sealing section (28) extends linearly from one side of the fastening section (30) to a radially opposite side of the fastening section (30).

17. The diaphragm valve (10) according to any one of claims 8 to 16, characterized in that The sealing section (28) has at least one sealing pressure relief section (66).

18. The diaphragm valve (10) according to claim 17, characterized in that The at least one sealed pressure relief section (66) is designed to be complementary to the at least one pressure relief section (58, 60, 62).

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