Diaphragm and diaphragm valve

Abstract

The invention relates to a diaphragm (300) for a diaphragm valve. The diaphragm (300) has a functional area (302) and a fastening portion (304) surrounding the functional area (302). In a relaxed state (306), the functional area (302) comprises a central portion (308) protruding on a wet side (390) of the diaphragm (300), a lateral portion (310) protruding on a dry side (392) of the diaphragm (300), the lateral portion (310) being at least partially curved towards the dry side (392) of the diaphragm (300), and an intermediate portion (312) arranged between the central portion (308) and the lateral portion (310) and being at least partially curved towards the wet side (390) of the diaphragm (300).

Description

TECHNICAL FIELD

[0001] The present invention relates to a diaphragm for a diaphragm valve, a valve body and a diaphragm valve. BACKGROUND

[0002] It is known that diaphragms for diaphragm valves are subject to wear. This wear increases the maintenance and replacement cycle of the diaphragm due to a reduction in the service life.

[0003] It is therefore an object of the present invention to reduce the wear of the diaphragm of a diaphragm valve and thereby to increase the service life of the diaphragm. SUMMARY

[0004] The object of the present invention is achieved by a diaphragm according to the independent claim 1, a valve body according to the independent claim and a diaphragm valve according to the further independent claim. Advantageous further developments are specified in the dependent claims and can be found in the description and the drawings.

[0005] A first aspect of the present specification relates to a diaphragm for a diaphragm valve, the diaphragm having a functional area and a fastening portion surrounding the functional area, the functional area in a relaxed state comprising: a central portion, the central portion protruding on a wet side of the diaphragm; a lateral portion, the lateral portion protruding on a dry side of the diaphragm, the lateral portion being at least partially curved towards the dry side of the diaphragm; and an intermediate portion, the intermediate portion being arranged between the central portion and the lateral portion and being at least partially curved towards the wet side of the diaphragm.

[0006] By the opposite curvatures of the intermediate portion and the lateral portion, a gentle rolling or flexing of the functional area, in particular outwards, can be achieved. In addition, the relaxed state denotes a relaxed intermediate position between an open position and a closed position of the diaphragm. This reduces material stresses occurring during the movement. In particular, this prevents the diaphragm from buckling during the positioning process. Buckling is prevented by reducing the radial compression and the radial expansion of the material. Instead, a material-friendly rolling or flexing movement of the diaphragm can be achieved. The service life of the diaphragm is increased, while the maintenance cycle is prolonged.

[0007] An advantageous example is characterized in that, in the region comprising the intermediate portion and the lateral portion, the diaphragm thickness is at least partially reduced towards the fastening portion.

[0008] The rolling or flexing movement of the diaphragm in the border region of the functional area of the diaphragm is advantageously supported by the reduction in thickness.

[0009] An advantageous example is characterized in that the intermediate portion at least partially follows a circular arc having a first radius.

[0010] An advantageous example is characterized in that the lateral portion at least partially follows a circular arc having a second radius, and the second radius is smaller than the first radius.

[0011] This reduction of the radius outwards causes the diaphragm to be forced into a flexing motion.

[0012] An advantageous example is characterized in that the ratio of the second radius to the first radius is between 0.40 and 0.85, in particular between 0.55 and 0.75.

[0013] This minimum dimension of the second radius forces the diaphragm into the desired flexing motion with the largest possible flexing radius in the area of the side portion. When the diaphragm is pulled away from the valve seat, the side area is prevented from breaking.

[0014] An advantageous example is characterized in that the first radius is in the range of more than 1 / 10 of the seat diameter, in particular in the range of between 1 / 17 and 1 / 5 of the seat diameter, in particular in the range of between 1 / 11 and 1 / 7 of the seat diameter.

[0015] In this way, the side area is matched to the seat diameter in such a way that the diaphragm is forced into a motion that does not fall below the minimum flexing radius of the side area, which depends on the material used and the thickness of the diaphragm. The stress on the diaphragm material is thus reduced.

[0016] An advantageous example is characterized in that the relaxed state of the diaphragm corresponds to an unloaded intermediate position of the diaphragm, which is between the open position and the closed position.

[0017] Advantageously, the creation of the unloaded intermediate position reduces the radial tension and compression forces that arise when the diaphragm is placed, which prolongs the service life of the diaphragm.

[0018] An advantageous example is characterized in that the central portion comprises a wet-side sealing web.

[0019] An advantageous example is characterized in that the sealing web is surrounded by two recesses in a cross section perpendicular to its course.

[0020] The sealing web exposed in this way improves the closing process.

[0021] An advantageous example is characterized in that the wet-side contour of the intermediate portion is rotationally symmetrically configured with respect to the positioning axis and the sealing web transitions into the rotationally symmetrically configured wet-side contour.

[0022] Advantageously, on the one hand, sufficient force can be exerted centrally on the sealing web of the valve body. On the other hand, the transition of the sealing web into the rotationally symmetric intermediate portion allows the boundary fibers to expand toward the side portion to be reduced.

[0023] A second aspect of the present description relates to a diaphragm valve comprising a diaphragm according to the first aspect, which is supported between a valve body and a drive body.

[0024] An advantageous example is characterized in that the length of the longitudinal sectional profile of the functional area of the diaphragm is shorter than the longitudinal sectional profile of the sealing web of the valve body, in particular 1-4% shorter, in particular 2-3% shorter.

[0025] This longitudinal sectional profile adjustment advantageously supports a minimum bending radius of not less than in the lateral area of the functional area.

[0026] An advantageous example is characterized in that the valve body comprises a fastening portion for the diaphragm, the sealing web for interacting with the functional area of the diaphragm being arranged within the fastening portion, the sealing profile of the sealing web of the valve body comprising two convexly curved contact portions in the longitudinal section of the sealing web, the contact portions each abutting inwardly against the fastening portion.

[0027] A third aspect of the present description relates to a valve body for a diaphragm valve, the valve body comprising a fastening portion for the diaphragm, a sealing web for interacting with the functional area of the diaphragm being arranged within the fastening portion, the sealing profile of the sealing web comprising two convexly curved contact portions in the longitudinal section of the sealing web, the contact portions each abutting inwardly against the fastening portion.

[0028] The convex contact portions prevent the diaphragm from buckling during the movement. Instead, the contact portions transition the diaphragm into a crimping or bending movement, in particular when it is pulled away from the valve seat, thus protecting the diaphragm material in the radially outer area. This puts less strain on the diaphragm. In addition, the proposed sealing profile allows the diaphragm to be pressed more evenly over the sealing profile. Thus, the service life of the diaphragm is increased in several ways.

[0029] In contrast to the prior art, the seat geometry actually defines a smaller cross-sectional area. However, the above-mentioned crimping movement and the resulting reduction in diaphragm load allow an increased valve lift. Since the valve has a larger opening cross-sectional portion than in the prior art, the increased valve lift even overcompensates the smaller seat cross-sectional area. Thus, a relatively large flow rate can be provided.

[0030] An advantageous example is characterized in that the convexly curved contact portions at least partially follow a circular arc, the radius of which is in the range of more than 1 / 10 of the seat diameter, in particular in the range of between 1 / 17 and 1 / 5 of the seat diameter, in particular in the range of between 1 / 11 and 1 / 7 of the seat diameter.

[0031] This range of values for the radius of the convex curved contact portion advantageously provides a seat profile on the diaphragm that is gentle and supports the crimping motion. The crimping or bending radius in the longitudinal section of the diaphragm is not lower than a minimum value during the motion of the diaphragm, which means that the diaphragm does not buckle, but rather transitions into a crimping motion, for example upon opening of the valve. The opening motion always exerts a large amount of strain on the diaphragm, since the profile of the pressure piece can only support this process to a limited extent. The radius selected for the convex curved contact portion reduces the above-mentioned stress problems.

[0032] An advantageous example is characterized in that the imaginary tangent at the point of inflection of the sealing profile forms an angle with the positioning axis in the range between 40° and 52°, in particular in the range between 44° and 50°, and in particular in the range between 47° and 49°.

[0033] The imaginary tangent advantageously provides a valve seat which on the one hand allows an increased seat depth and at the same time also allows the diaphragm to be pressed sufficiently against the valve seat in order to keep the diaphragm valve firmly closed.

[0034] An advantageous example is characterized in that the convex curved contact portion perpendicular to the positioning axis occupies 1 / 20 to 1 / 5 of the seat diameter of the sealing web, in particular 1 / 15 to 1 / 6 of the seat diameter.

[0035] Advantageously, the convex contact portion thereby protrudes far enough into the valve seat opening, so that the unfolding of the diaphragm is advantageously supported.

[0036] An advantageous example is characterized in that at least one concavely curved contact portion of the sealing profile in the longitudinal section of the sealing web abuts the corresponding convexly curved contact portion inward, the degree of curvature of the concavely curved portion being less than that of the convexly curved portion.

[0037] Advantageously, the convexly curved contact portion transitions into the concavely curved contact portion, thereby allowing the diaphragm to be pressed seamlessly onto the sealing web. The less pronounced curvature of the concavely curved portion ensures that a sufficiently large flow cross section is provided.

[0038] An advantageous example is characterized in that the center of curvature of the convexly curved portion and the center of curvature of the concavely curved portion lie on an imaginary common line, which forms an angle with the positioning axis in the range between 45° and 70°, in particular in the range between 65° and 50°.

[0039] A fifth aspect of the present description relates to a diaphragm for a diaphragm valve, the diaphragm comprising a fastening portion, a functional area for interacting with a sealing web of a valve body being arranged within the fastening portion, a closing profile of the functional area formed in a closed state of the diaphragm comprising two concavely curved contact portions in a longitudinal section of the functional area, each contact portion abutting the fastening portion inward.

[0040] A sixth aspect of the present specification relates to a diaphragm valve comprising a valve body according to the first aspect and a diaphragm according to the second aspect.

[0041] One advantageous example of a diaphragm valve is characterized in that the concave curved contact portions of the diaphragm each abut the associated convex curved contact portion of the valve body when the diaphragm valve is in a closed state. BRIEF DESCRIPTION OF DRAWINGS

[0042] In the drawings:

[0043] Figure 1 A part of a diaphragm valve is shown in exploded view;

[0044] Figure 2 is a schematic longitudinal section of a sealing web of the valve body;

[0045] Figure 3 and Figure 4 are individual longitudinal sections of the diaphragm;

[0046] Figure 5 The diaphragm and the associated valve body are shown in schematic section;

[0047] Figure 6 Various positions of the diaphragm are shown in schematic form;

[0048] Figure 7 is a schematic section of a central portion of the diaphragm; and

[0049] Figure 8 is a view of the wet side of the diaphragm. DETAILED DESCRIPTION

[0050] Figure 1 A part of a diaphragm valve 100 is shown in exploded view. The valve body 200, the first diaphragm 300 and the second diaphragm 400 are shown along a positioning axis 102. The two diaphragms 300 and 400 form a two-part diaphragm structure 104, wherein the first diaphragm 300 can be designated as a diaphragm shroud and the diaphragm 400 can be designated as a support diaphragm. The diaphragms 300, 400 comprise a wet side 390, 490 and a dry side 392, 492, the dry side 392, 492 facing away from the valve body 200, the wet side 390, 490 facing towards the valve body 200.

[0051] In one example, the first diaphragm 300 comprises polytetrafluoroethylene PTFE or perfluoroalkoxy polymer PFA, while the second diaphragm 400 comprises an elastomer, such as vulcanized ethylene propylene diene rubber EPDM. In another example, the choice of materials is different. In a further example, only a single diaphragm comprising PTFE, PFA or EPDM is used.

[0052] The pin 330, which is fixedly connected to the first diaphragm 300, extends through the central opening 430 of the second diaphragm 400 and is connected to a valve stem (not shown). The valve stem is driven by a driver (not shown) in order to move the diaphragm 330 along the positioning axis 102.

[0053] The valve body 200 comprises two process fluid connections 230, 232. A specific fluid passage leads from the corresponding process fluid connection 230, 232 to the sealing web 206, which is accessible via an opening 234 of the valve body 200.

[0054] The valve structure 104 is inserted into the opening 234 and clamped in a liquid-tight manner in the corresponding side fastening portions between the valve body 200 and the drive body. In the adjustment direction 106, the driver presses the diaphragm structure 104 onto the sealing web 206 in order to prevent a fluid flow between the fluid passages. When the diaphragm structure 104 is lifted away from the sealing web 206, the opening cross section is opened, allowing a fluid flow between the two fluid passages.

[0055] In the present case, the diaphragm structure 104 comprises two diaphragms 300, 400. Of course, the aspects disclosed in the present specification can also be transferred to a diaphragm structure having a single diaphragm or more than two diaphragms.

[0056] Figure 2 A schematic longitudinal section of the sealing web 206 of the valve body 200 is shown. The sealing web 206 is mirror-symmetrically configured with respect to the positioning axis 102, which is why only half of the valve body 200 is shown in Figure 2 .

[0057] The valve body 200 comprises an outer fastening portion 204, which is used to abut Figure 1 the diaphragm 300 and to support Figure 1 the diaphragm structure 104. The sealing web 206 is arranged within the fastening portion 204 in order to interact with the functional area of the diaphragms 300, 400.

[0058] The sealing contour of the sealing web 206 comprises two contact portions 210, which are convexly curved in the longitudinal section yz of the sealing web 260 and each abut the associated fastening portion 204 inwardly toward the positioning axis 102. The sealing contour of the sealing web 206 extends along the surface of the sealing web 206 and in relation to the longitudinal section yz of the sealing web 206.

[0059] The convexly curved contact portions 210 at least partially follow a circular arc, the radius R10 of which is greater than 1 / 10 of the seat diameter d0 within a certain range, in particular in a range between 1 / 17 and 1 / 5 of the seat diameter d0, and in particular in a range between 1 / 11 and 1 / 7 of the seat diameter d0.

[0060] At the inflection point 216, the imaginary tangent 214 of the sealing profile forms an angle a with the positioning axis 102 in a range between 40° and 52°, in particular in a range between 44° and 50°, and in particular in a range between 47° and 49°. In a portion 240 around the inflection point 216, the sealing web 206 follows the tangent 214, whereby the portion 240 in the cross section yz is within an imaginary truncated cone surface with the positioning axis 102 as the cone axis.

[0061] The convex curved contact portion 210 occupies 1 / 20 to 1 / 5 of the seat diameter d0 of the sealing web 206, in particular 1 / 15 to 1 / 6 of the seat diameter d0, perpendicular to the positioning axis 102.

[0062] The sealing web 206 comprises at least one concave curved contact portion 212 in the longitudinal cross section yz of the sealing web 206. The inner region of the sealing profile of the sealing web 206 is surrounded by two convex curved contact portions 210, wherein the sealing profile comprises at least one concave curved contact portion 212. The concave contact portion 212 abuts the corresponding convex curved contact portion 210 inwardly towards the positioning axis 102. In the present case, the sealing web 206 comprises a central flat plateau portion 224. It is also possible to omit the plateau portion 224, resulting in a single concave curved contact portion 212. The degree of curvature of the concave curved portion 212 is less than the convex curved portion 210.

[0063] The center of curvature 218 of the convex curved portion 210 and the center of curvature 220 of the concave curved portion 212 are located on an imaginary common line 222. The line 222 forms an angle b with the positioning axis 102 in a range between 45° and 70°, in particular in a range between 65° and 50°.

[0064] The concave contact portion 212 at least partially follows a circular path with a second radius R12, the first radius R10 being greater than one sixth and less than one half of the second radius R12, in particular greater than one fourth and less than one half of the second radius R12.

[0065] Figure 3 A longitudinal cross section of the septum 300 is shown, and Figure 4 A longitudinal cross section of the septum 400 is shown. Both septums 400 are described together below.

[0066] The diaphragms 300, 400 comprise a functional area 302, 402 and a fastening portion 304, 404 surrounding the functional area 302, 402. The diaphragms 300, 400 are shown in a relaxed state, which means that no force is exerted on the diaphragms 300, 400. In particular, in the shown relaxed state, the diaphragms 300, 400 are not clamped in a valve or connected to an actuator.

[0067] The functional area 302, 402 in the relaxed state 306, 406 comprises a central portion 308, 408 protruding on the wet side 390, 490 of the diaphragm 300, 400, a lateral portion 310, 410 protruding on the dry side 392, 492 of the diaphragm 300, 400, the lateral portion 310, 410 being at least partially curved towards the dry side 392, 492 of the diaphragm 300, 400, and an intermediate portion 312, 412 arranged between the central portion 308, 408 and the lateral portion 310, 410, the intermediate portion 312, 412 being at least partially curved towards the wet side 390, 490 of the diaphragm 300, 400.

[0068] A first vertical plane 340, 440 of the positioning axis 102 extends through the fastening portion 304, 404. A second vertical plane 342, 442 of the positioning axis delimits the lateral portion 310, 410 from the outside. A third vertical plane 344, 444 delimits the central portion 308, 408 from the outside. The first vertical plane 340, 440 is located between the second vertical plane 342, 442 and the third vertical plane 344, 444.

[0069] In the area comprising the intermediate portion 312, 412 and the lateral portion 310, 410, the diaphragm thickness or wall thickness of the diaphragm 300, 400 is at least partially reduced towards the fastening portion 304, 404. In a further example, the diaphragm thickness or wall thickness of the diaphragm 300, 400 in the area comprising the intermediate portion 312, 412 and the lateral portion 310, 410 is chosen to be substantially constant.

[0070] The intermediate portion 312, 412 at least partially follows a circular arc 314, 414 having a first radius R1_3, R1_4. The lateral portion 310, 410 at least partially follows a circular arc 316, 416 having a second radius R2_3, R2_4. The second radius R2_3, R2_4 is chosen to be smaller than the first radius R1_3, R1_4. In particular, the ratio of the second radius R2_3, R2_4 to the first radius R1_3, R1_4 is between 0.40 and 0.85, in particular between 0.55 and 0.75. The first radius R1_3, R1_4 is in the range of more than 1 / 10 of the seat diameter d0, in particular in the range of between 1 / 17 and 1 / 5 of the seat diameter d0, and in particular in the range of between 1 / 11 and 1 / 7 of the seat diameter d0.

[0071] Figure 5 The diaphragm 300 and the associated valve body 200 are shown in schematic cross-section. Fastening portions 204 and 304 abut against each other in a liquid-tight manner. The diaphragm 300 is schematically shown in a relaxed state. An opening section 520 is formed between the diaphragm 300 and the sealing web 206, through which process fluid can flow.

[0072] If the diaphragm 300 is pressed against the sealing web 206, this causes a closed profile of the functional region 302 to be formed in this closed state of the diaphragm 300. This closed profile has two contact portions 510 that are concavely curved in the longitudinal section yz of the functional region 302 and each abuts inwardly against the fastening portion 304. The closed profile of the functional region 302 refers to the wet side surface of the diaphragm 300, specifically in the longitudinal section xy of the associated sealing web 206. When the diaphragm valve 100 is in the closed state, the concave curved contact portions 510 of the diaphragm 300 abut against the associated convex curved contact portions 210 of the valve body 200.

[0073] Figure 3 or Figure 4 The length of the longitudinal section profile of the functional areas 302 and 402 of the diaphragms 300 and 400 is shorter than that of the longitudinal section profile of the sealing web 206 of the valve body 200, particularly by 1-4% and especially by 2-3%. The longitudinal section profile refers to the wet side surface of the diaphragms 300 and 400, particularly in the longitudinal section of the associated sealing web 206.

[0074] Figure 6 The various positions of the diaphragm are schematically shown in cross section yz. Figure 3 and Figure 4 The diaphragm of 300 and 400 was not in Figure 6 The relaxed states 306 and 406 shown correspond to the unloaded intermediate positions of the diaphragms 300 and 400, which are located between the open position 602 and the closed position 604. The maximum opening cross-section 610 is created between the open position 602 and the closed position 604.

[0075] As the diaphragms 300 and 400 are lifted away from the sealing web 206 and moved toward the open position 602, they reach the indicated position 606. Due to the construction of the diaphragms 300 and 400 as explained in this specification, a lateral bend 608 is achieved at position 606 in the cross-section including the positioning axis 102. The protrusion 608 faces the corresponding wet side opening. The bend 608 includes a minimum deflection radius Rw, which is not less than this minimum deflection radius when passing through the position from position 604 to position 602.

[0076] Figure 7A schematic cross-section of the center portion of the septum 300 is shown. The center portion 308 comprises a wet side sealing web 702. The sealing web 702 is surrounded by two recesses 704, 706 in a cross-section xz perpendicular to the course of the sealing web 702.

[0077] In an alternative example, the sealing web 702 and the corresponding recesses 704, 706 are omitted. In this example, the wet side surface of the center portion 308 is rotationally symmetric with respect to the positioning axis 108.

[0078] Figure 8 A view of the wet side of the septum 300 in the z-direction is shown. The septum 300 comprises a wet side surface profile of the intermediate portion 312 which is designed to be rotationally symmetric with respect to the positioning axis 102. In the regions 802 and 804, the sealing web 702 continuously transitions into the rotationally symmetric wet side surface profile of the intermediate portion 312.

Claims

1. A diaphragm (300; 400) for a diaphragm valve (100), wherein, The diaphragm (300; 400) has functional regions (302; 402) and fastening portions (304; 404) surrounding the functional regions (302; 402), and a relaxed state (306; The functional area (302; 402) under 406) includes: (i) a central portion (308; 408) protruding on the wet side (390; 490) of the diaphragm (300; 400); (ii) a side portion (310; 410) protruding over the dry side (392; 492) of the diaphragm (300; 400), the side portion (310; 410) being at least partially curved toward the dry side (392; 492) of the diaphragm (300; 400); and (iii) An intermediate portion (312; 412) disposed between the central portion (308; 408) and the side portions (310; 410), and at least partially curved toward the wet side (390; 490) of the diaphragm (300; 400), wherein the wet side profile of the intermediate portion (312; 412) is rotationally symmetrical with respect to the positioning axis (102), and the intermediate portion (312; 412) at least partially conforms to Following an arc (314; 414) with a first radius (R1_3; R1_4), the side portion (310; 410) at least partially follows an arc (316; 416) with a second radius (R2_3; R2_4), the second radius (R2_3, R2_4) being smaller than the first radius (R1_3, R1_4), and the ratio of the second radius (R2_3; R2_4) to the first radius (R1_3; R1_4) being between 0.40 and 0.

85.

2. The diaphragm (300; 400) according to claim 1, wherein, The diaphragm thickness in the region including the middle portion (312; 412) and the side portion (310; 410) decreases at least partially toward the fastening portion (304; 404).

3. The diaphragm (300; 400) according to claim 1, wherein the ratio of the second radius (R2_3; R2_4) to the first radius (R1_3; R1_4) is between 0.55 and 0.

75.

4. The diaphragm (300; 400) according to claim 3, wherein, The first radius (R1_3; R1_4) is within 1 / 10 of the seat diameter (d0) of the sealing web (206) of the valve body (200) for the diaphragm valve (100).

5. The diaphragm (300; 400) according to claim 3, wherein, The first radius (R1_3; R1_4) is between 1 / 17 and 1 / 5 of the seat diameter (d0) of the sealing web (206) of the valve body (200) for the diaphragm valve (100).

6. The diaphragm (300; 400) according to claim 3, wherein, The first radius (R1_3; R1_4) is between 1 / 11 and 1 / 7 of the seat diameter (d0) of the sealing web (206) of the valve body (200) for the diaphragm valve (100).

7. The diaphragm (300; 400) according to any one of claims 1 to 6, wherein, The relaxed state (306; 406) of the diaphragm (300; 400) corresponds to the unloaded intermediate position of the diaphragm (300; 400), which is between the open position (602) and the closed position (604).

8. The diaphragm (300) according to any one of claims 1 to 6, wherein, The central portion (308) includes a wet-side sealing web (702).

9. The diaphragm (300) according to claim 8, wherein, The wet-side sealing web (702) is surrounded by two recesses (704, 706) in a section (xz) perpendicular to its orientation.

10. The diaphragm (300) according to claim 8, wherein, The wet-side sealing web (702) transitions into the rotationally symmetrical wet-side profile.

11. A diaphragm valve (100) comprising a diaphragm (300; 400) according to any one of claims 1 to 10, wherein, The diaphragm (300; 400) is supported between the valve body (200) and the drive body.

12. The diaphragm valve (100) according to claim 11, wherein, The length of the longitudinal section profile of the functional area (302; 402) of the diaphragm (300; 400) is shorter than the longitudinal section profile of the sealing web (206) of the valve body (200).

13. The diaphragm valve (100) according to claim 11, wherein, The length of the longitudinal section profile of the functional area (302; 402) of the diaphragm (300; 400) is 1-4% shorter than the longitudinal section profile of the sealing web (206) of the valve body (200).

14. The diaphragm valve (100) according to claim 11, wherein, The length of the longitudinal section profile of the functional area (302; 402) of the diaphragm (300; 400) is 2-3% shorter than the longitudinal section profile of the sealing web (206) of the valve body (200).

15. The diaphragm valve (100) according to any one of claims 11 to 14, wherein, The valve body (200) includes a fastening portion (204) for the diaphragm (300; 400), and a sealing web (206) for cooperating with the functional areas (302; 402) of the diaphragm (300; 400) is disposed within the fastening portion (204). The sealing profile of the sealing web (206) of the valve body (200) includes two contact portions (210) that are convexly curved in the longitudinal section (yz) of the sealing web (206) and each abuts inward against the fastening portion (204).

16. A valve body (200) for a diaphragm valve (100), wherein, The valve body (200) includes a fastening portion (204) for a diaphragm (300; 400) according to any one of claims 1 to 10, and a sealing web (206) for cooperating with a functional region (302; 402) is located within the fastening portion (204) of the diaphragm (300; 400). The sealing profile of the sealing web (206) includes two contact portions (210) that are convexly curved in the longitudinal section (yz) of the sealing web (206) and each abuts inwardly against the fastening portion (204), wherein the imaginary tangent (214) of the sealing profile at the inflection point (216) forms an angle (α) with the positioning axis (102) in the range of 40° to 52°.

17. The valve body (200) according to claim 16, wherein, The convexly curved contact portion (210) at least partially follows an arc, the radius (R10) of which is greater than 1 / 10 of the seat diameter (d0) of the sealing web (206).

18. The valve body (200) according to claim 16, wherein, The convexly curved contact portion (210) at least partially follows an arc, the radius (R10) of which is between 1 / 17 and 1 / 5 of the seat diameter (d0) of the sealing web (206).

19. The valve body (200) according to claim 16, wherein, The convexly curved contact portion (210) at least partially follows an arc, the radius (R10) of which is between 1 / 11 and 1 / 7 of the seat diameter (d0) of the sealing web (206).

20. The valve body (200) according to any one of claims 16 to 19, wherein, The angle (α) is in the range of 44° to 50°.

21. The valve body (200) according to any one of claims 16 to 19, wherein, The angle (α) is in the range of 47° to 49°.

22. The valve body (200) according to any one of claims 16 to 19, wherein the convexly curved contact portion (210) perpendicular to the positioning axis (102) occupies 1 / 20 to 1 / 5 of the seat diameter (d0) of the sealing web (206).

23. The valve body (200) according to any one of claims 16 to 19, wherein the convexly curved contact portion (210) perpendicular to the positioning axis (102) occupies 1 / 15 to 1 / 6 of the seat diameter (d0) of the sealing web (206).

24. The valve body (200) according to any one of claims 16 to 19, wherein, At least one contact portion (212) of the sealing profile, which is concavely curved in the longitudinal section (yz) of the sealing web (206), abuts inward against a corresponding convexly curved contact portion (210), wherein the degree of curvature of the concavely curved contact portion (212) is less than that of the convexly curved contact portion (210).

25. The valve body (200) according to claim 24, wherein, The curvature center (218) of the convexly curved contact portion (210) and the curvature center (220) of the concavely curved contact portion (212) are located on an imaginary common line (222), which forms an angle (β) with the positioning axis (102) in the range of 45° to 70°.

26. The valve body (200) according to claim 24, wherein, The curvature center (218) of the convexly curved contact portion (210) and the curvature center (220) of the concavely curved contact portion (212) are located on an imaginary common line (222), which forms an angle (β) with the positioning axis (102) in the range of 50° to 65°.

27. A diaphragm valve (100) comprising a valve body (200) according to any one of claims 16 to 26 and a diaphragm (300; 400), the diaphragm (300; 400) including a fastening portion (304; 404), a functional region (302; 402) for cooperating with a sealing web (206) of the valve body (200) being disposed within the fastening portion (304; 404), the closed profile of the functional region (302; 402) formed in a closed state of the diaphragm (300; 400) including two concavely curved contact portions (510) in a longitudinal section (yz) of the functional region (302; 402), each of the concavely curved contact portions (510) of the diaphragm (300) abutting inwardly against the fastening portion (304; 404).

28. The diaphragm valve (100) according to claim 27, wherein, When the diaphragm valve (100) is in the closed state, the concave curved contact portion (510) of the diaphragm (300) abuts against the associated convex curved contact portion (210) of the valve body (200).

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