Composite diaphragm for diaphragm valve, diaphragm valve and using method of diaphragm valve
By using a composite diaphragm in the diaphragm valve and using the second diaphragm layer to tighten the first diaphragm layer and the diaphragm convex ring, the water leakage problem caused by the continuous stress of the diaphragm is solved, and high sealing and long life in harsh environments are achieved.
Patent Information
- Application Number
- CN202510095223.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-03-11
AI Technical Summary
In the scene where the diaphragm is not pressed with a pressure gland, the elasticity of the diaphragm becomes weak due to continuous stress, resulting in a smaller compression of the sealing surface, which leads to a water leakage problem.
A composite diaphragm is adopted, including a first diaphragm layer and a second diaphragm layer. The edge of the second diaphragm layer is bent toward the first diaphragm layer. When the valve is opened at the maximum amount, the second diaphragm layer presses the first diaphragm layer tightly, combining the design of the diaphragm convex ring and the annular sealing groove to enhance sealing and self-locking ability.
Through the design of the composite diaphragm, it can maintain sealing performance in harsh environments, avoid leakage problems caused by temperature difference or pressure changes, extend service life and improve use range.
Smart Images
Figure CN119594207A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of valves, and specifically relates to a valve with a diaphragm cutting device, and more particularly to a composite diaphragm for a diaphragm valve, a diaphragm valve and a method for using the diaphragm valve. Background Art
[0002] The diaphragm valve uses the diaphragm to open and close the flow channel; due to the high pressure of the flowing medium in the diaphragm valve, the sealing surface of the diaphragm will continue to be subjected to a large force during long-term use.
[0003] In the related technology that does not use a pressure cover to press the diaphragm, the diaphragm is made of a single material as a whole. When the sealing surface is continuously subjected to a reverse force, the elasticity is easily weakened, resulting in a decrease in the overall compression of the diaphragm, thereby causing a water leakage problem.
[0004] Therefore, how to solve the problem that the elasticity of the diaphragm is easily weakened due to continuous force in the scenario where the pressure cover is not used to press the diaphragm.
[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention
[0006] The embodiments of the present disclosure at least provide a composite diaphragm for a diaphragm valve, a diaphragm valve, and a method for using the diaphragm valve.
[0007] In a first aspect, an embodiment of the present disclosure provides a composite diaphragm for a diaphragm valve, comprising: a first diaphragm layer, a second diaphragm layer and a connecting piece, wherein one side of the second diaphragm layer is connected to the first diaphragm layer, and the other side is connected to the connecting piece; wherein a flange is provided on the side of the first diaphragm layer away from the second diaphragm layer, and a diaphragm convex ring is provided on the inner wall of the flange.
[0008] In an optional embodiment, the connecting member includes: a boss portion and a connecting portion; wherein the boss portion is located in the second diaphragm layer and is welded to the second diaphragm layer.
[0009] In an optional embodiment, a wire mesh is uniformly distributed in the second diaphragm layer; wherein at the boss portion, the wire mesh is located above the boss portion.
[0010] In an optional embodiment, a plurality of through holes are formed on the boss portion.
[0011] In an optional embodiment, the connecting member and the second diaphragm layer are integrally formed and made of the same material.
[0012] In an optional embodiment, the elastic modulus of the first diaphragm layer is smaller than that of the second diaphragm layer; the edge of the second diaphragm layer is bent toward the first diaphragm layer; wherein, at the maximum valve opening amount, the second diaphragm layer presses the first diaphragm layer.
[0013] In a second aspect, the disclosed embodiment further provides a diaphragm valve, comprising: a valve body, in which a boss is arranged, and an annular sealing groove is formed on the boss; a composite diaphragm; wherein the composite diaphragm is pressurized so that the flange is pressed into the annular sealing groove, and the diaphragm boss is tightened in the annular sealing groove.
[0014] In an optional embodiment, the elastic modulus of the first diaphragm layer is smaller than that of the second diaphragm layer; the edge of the second diaphragm layer is bent toward the first diaphragm layer; wherein, at the maximum valve opening amount, the second diaphragm layer presses the first diaphragm layer against the boss.
[0015] In an optional embodiment, a flow channel and a diaphragm mounting groove are provided in the valve body; wherein the middle part of the bottom of the diaphragm mounting groove is connected to the flow channel, and the edge of the bottom of the groove forms the boss.
[0016] In an optional embodiment, an annular protrusion is provided on the upper surface of the boss, and the annular protrusion is located in the inner circle of the annular sealing groove; wherein the first diaphragm layer is pressed against the annular protrusion.
[0017] In an optional embodiment, a blocking protrusion is provided in the flow channel; wherein the direction of the blocking protrusion is orthogonal to the direction of the flow channel, and the composite membrane is pressed to fit the blocking protrusion to cut off the flow channel.
[0018] On the third aspect, the embodiments of the present disclosure also provide a method for using a diaphragm valve, including: pressing the first diaphragm layer of the composite diaphragm against the boss of the valve body, and pressing the flange of the first diaphragm layer into the annular sealing groove of the boss; driving the connecting part of the composite diaphragm to rise and fall so that the first diaphragm layer of the composite diaphragm opens and closes the flow channel; wherein, when the valve is opened to the maximum extent, the second diaphragm layer of the composite diaphragm presses the first diaphragm layer of the composite diaphragm against the boss.
[0019] The beneficial effects of the present invention are that the composite diaphragm for a diaphragm valve, the diaphragm valve and the method for using the diaphragm valve adopt a composite method of the first diaphragm layer and the second diaphragm layer, so that the composite diaphragm can be resistant to high temperature and strong acid and alkali, and its metal, anion and cation precipitation, and TOC meet the use requirements of the semiconductor industry, so that it can be used in harsh environments and environments with high cleanliness requirements; at the same time, by setting a diaphragm convex ring, the composite diaphragm can have sealing and self-locking capabilities, and the sealing effect is more stable.
[0020] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.
[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 A three-dimensional diagram of a composite membrane provided in an embodiment of the present disclosure; Figure 2 A schematic cross-sectional structure diagram of a composite membrane provided in an embodiment of the present disclosure; Figure 3 A schematic diagram of the structure of a connector provided in an embodiment of the present disclosure; Figure 4 A schematic structural diagram of another connecting member provided in an embodiment of the present disclosure; Figure 5 A schematic structural diagram of a connector with a through hole provided in an embodiment of the present disclosure; Figure 6 A schematic diagram of a cross-sectional structure of a valve body provided in an embodiment of the present disclosure; Figure 7 A schematic diagram of the structure of a flow channel provided in an embodiment of the present disclosure; Figure 8 A schematic diagram of the top structure of a valve body provided in an embodiment of the present disclosure.
[0024] In the figure: Valve body 1, boss 11, annular sealing groove 12, flow channel 13, diaphragm mounting groove 14, blocking convex piece 15, annular protrusion 16; Composite diaphragm 2 , first diaphragm layer 21 , flange 211 , diaphragm protrusion 212 , second diaphragm layer 22 , connector 23 , boss portion 231 , connector portion 232 , through hole 233 , wire mesh 24 . DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, in the drawings, the thickness of the components may be exaggerated or reduced in order to effectively describe the technical content.
[0027] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0028] like Figure 1 As shown, at least one embodiment provides a composite diaphragm for a diaphragm valve, comprising: a first diaphragm layer 21 , a second diaphragm layer 22 and a connecting member 23 .
[0029] In this embodiment, the first diaphragm layer 21 is the sealing surface of the composite diaphragm 2, and is made of PTFE (Polytetrafluoroethylene), which is resistant to high temperatures and strong acids and alkalis, and its metal, anion and cation precipitation, and TOC (Total Organic Carbon) meet the use requirements of the semiconductor industry, so that it can be used in harsh environments and environments with high cleanliness requirements.
[0030] like Figure 1 As shown, in some embodiments, one side of the second diaphragm layer 22 is connected to the first diaphragm layer 21 , and the other side is connected to the connecting member 23 .
[0031] like Figure 2 As shown, in some embodiments, a flange 211 is provided on a side of the first diaphragm layer 21 away from the second diaphragm layer 22 , and a diaphragm protrusion 212 is provided on an inner wall of the flange 211 .
[0032] In the related art, in an operating environment where the temperature difference between the media transported front and back is too large, the switching between high and low temperatures will cause thermal expansion and contraction of the valve body 1 and the diaphragm, which may easily cause the diaphragm to deform and / or the diaphragm to move slightly upward, thereby causing valve leakage; or in an operating environment where the medium pressure is too high, it may easily cause the diaphragm to deform and / or the diaphragm to move slightly upward, thereby causing valve leakage.
[0033] In this embodiment, the diaphragm convex ring 212 on the flange 211 is interference fit with the valve body 1, so that the composite diaphragm 2 has sealing and self-locking capabilities, the sealing effect is more stable, and valve leakage caused by excessive temperature difference or excessive pressure is avoided.
[0034] In the related art, the diaphragm is connected to the connecting member 23 by only a layer of rubber fastening, and the connecting member 23 is easily pulled off during the opening / closing process of the diaphragm.
[0035] In order to solve the above problems, Figure 3 As shown, in one application scenario, the connector 23 includes: a boss portion 231 and a connecting portion 232 ; wherein the boss portion 231 is located in the second diaphragm layer 22 and is welded to the second diaphragm layer 22 .
[0036] In this embodiment, the boss portion 231 of the connecting member 23 is disposed in the second diaphragm layer 22 , thereby increasing the connection strength between the connecting member 23 and the second diaphragm layer 22 .
[0037] In some embodiments, a plurality of through holes 233 are formed on the boss portion 231 . The number of the through holes 233 is not limited, and the shape of the through holes 233 is not limited, and the shapes may be circular, polygonal, irregular, etc.
[0038] In this embodiment, when the boss portion 231 is welded to the second diaphragm layer 22 , the second diaphragm layer 22 will pass through the through hole 233 , thereby increasing the connection strength between the connector 23 and the second diaphragm layer 22 .
[0039] In some embodiments, the connection portion 232 is provided with threads.
[0040] In some embodiments, the second membrane layer 22 is evenly distributed with the wire mesh 24 ; wherein at the boss portion 231 , the wire mesh 24 is located above the boss portion 231 .
[0041] In this embodiment, the composite diaphragm 2 adds a layer of perforated wire mesh 24 in the second diaphragm layer 22, and the wire mesh 24 covers the entire second diaphragm layer 22. The pores of the wire mesh 24 are tightly combined with the second diaphragm layer 22. At the same time, the wire mesh 24 tightly holds the boss portion 231 of the connecting piece 23, so that the bonding force between the boss portion 231 and the second diaphragm layer 22 is greatly increased, thereby reducing the occurrence of the pull-off problem.
[0042] like Figure 4 As shown, in another application scenario, the connecting member 23 and the second diaphragm layer 22 are integrally formed.
[0043] In this embodiment, the connection member 23 and the second membrane layer 22 are integrally formed with the same material, thereby reducing the occurrence of the pull-off problem.
[0044] like Figure 2 As shown, in some embodiments, the elastic modulus of the first diaphragm layer 21 is smaller than that of the second diaphragm layer 22; the edge of the second diaphragm layer 22 is bent toward the first diaphragm layer 21; wherein, at the maximum valve opening amount, the second diaphragm layer 22 presses the first diaphragm layer 21.
[0045] In the related art, due to the high pressure of the flowing medium, the sealing surface of the diaphragm will continue to be subjected to a large upward force during long-term use, and this force will cause the diaphragm to break away from the seal.
[0046] In this embodiment, the upper layer of the composite diaphragm 2 is the second diaphragm layer 22, which is made of EPDM (EthylenePropylene Diene Monomer) material, which has excellent toughness, excellent heat resistance and aging resistance, and small compression permanent deformation. During long-term use, the elasticity will not weaken due to continuous force, and the overall compression of the diaphragm will be reduced, resulting in the occurrence of valve leakage problems. The sealing performance is good during long-term use.
[0047] like Figure 6 As shown, at least one embodiment provides a diaphragm valve, including: a valve body 1 and a composite diaphragm 2.
[0048] The specific structure and implementation process of the composite membrane 2 refer to the relevant discussion in the above embodiments, which will not be repeated here.
[0049] like Figure 5 As shown, in some embodiments, a boss 11 is provided in the valve body 1 , and an annular sealing groove 12 is formed on the boss 11 .
[0050] In this embodiment, the composite diaphragm 2 is pressed on the boss 11 so that the flange 211 is pressed into the annular sealing groove 12 and the diaphragm convex ring 212 is tightened in the annular sealing groove 12 .
[0051] In some embodiments, the composite membrane 2 includes: a first membrane layer 21 and a second membrane layer 22 .
[0052] In this embodiment, the composite diaphragm 2 is composed of a first diaphragm layer 21 and a second diaphragm layer 22. Due to the composite of the second diaphragm layer 22, the thickness of the overall composite diaphragm 2 is increased without affecting the ductility of the first diaphragm layer 21, so that the pressure resistance, wear and rupture resistance and service life of the composite diaphragm 2 are significantly improved, and it can be used for a long time in a medium with particles such as a grinding fluid, which greatly increases the service life and scope of use.
[0053] In some embodiments, the elastic modulus of the first diaphragm layer 21 is smaller than that of the second diaphragm layer 22 , and the edge of the second diaphragm layer 22 is bent toward the first diaphragm layer 21 .
[0054] In this embodiment, when the valve opening amount is maximum, the second diaphragm layer 22 presses the first diaphragm layer 21 against the boss 11 .
[0055] like Figure 7 As shown, in some embodiments, a flow channel 13 and a diaphragm mounting groove 14 are provided in the valve body 1, the middle of the groove bottom of the diaphragm mounting groove 14 is connected to the flow channel 13, and a boss 11 is formed at the edge of the groove bottom.
[0056] like Figure 6 As shown, in some embodiments, an annular protrusion 16 is provided on the upper surface of the boss 11 , and the annular protrusion 16 is located in the inner circle of the annular sealing groove 12 ; wherein the first diaphragm layer 21 is pressed against the annular protrusion 16 .
[0057] like Figure 8 As shown, in some embodiments, a blocking protrusion 15 is provided in the flow channel 13 , wherein the blocking protrusion 15 is arranged orthogonal to the direction of the flow channel 13 , and the composite membrane 2 is pressed to fit with the blocking protrusion 15 to cut off the flow channel 13 .
[0058] At least one embodiment provides a method for using a diaphragm valve, comprising: pressing the first diaphragm layer 21 of the composite diaphragm 2 onto the boss 11 of the valve body 1, and pressing the flange 211 of the first diaphragm layer 21 into the annular sealing groove 12 of the boss 11; driving the connecting piece 23 of the composite diaphragm 2 to rise and fall so that the first diaphragm layer 21 of the composite diaphragm 2 opens and closes the flow channel 13; wherein, at the maximum valve opening amount, the second diaphragm layer 22 of the composite diaphragm 2 presses the first diaphragm layer 21 of the composite diaphragm 2 onto the boss 11.
[0059] Regarding the specific structure and implementation process of the diaphragm valve, please refer to the relevant discussion in the above embodiments, which will not be repeated here.
[0060] In summary, the composite diaphragm for diaphragm valve, diaphragm valve and method of using the diaphragm valve adopt a composite method of the first diaphragm layer 21 and the second diaphragm layer 22, so that the composite diaphragm 2 can withstand high temperatures and strong acids and alkalis, and its metal, anion and cation precipitation, and TOC meet the use requirements of the semiconductor industry, so that it can be used in harsh environments and environments with high cleanliness requirements; at the same time, by setting the diaphragm protrusion 212, the composite diaphragm 2 can have sealing and self-locking capabilities, and the sealing effect is more stable.
[0061] Herein, when it is mentioned that a first component is located on a second component, this may mean that the first component may be directly formed on the second component, or a third component may be interposed between the first component and the second component.
[0062] In this article, when an element or layer is referred to as being "located on," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it may be directly located on, engaged, connected, attached to, or coupled to another element or layer, or there may be intermediate elements or layers. In contrast, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," "directly attached to," or "directly coupled to" another element or layer, there may be no intermediate elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0063] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0064] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.
[0065] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.
[0066] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0067] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in this document unless explicitly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.
[0068] Spatially relative terms, such as "inside", "outside", "below", "below", "down", "above", "on", etc., may be used herein to facilitate description of the relationship of one element or feature to another element or feature as illustrated in the figure. In addition to the orientation depicted in the figure, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is turned over, the elements described as "below" or "below" other elements or features will be oriented to be "above" other elements or features. Therefore, the example term "below" can cover the orientation above and below. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0069] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A composite diaphragm for a diaphragm valve, characterized in that: include: A first diaphragm layer (21), a second diaphragm layer (22), and a connecting piece (23), wherein one side of the second diaphragm layer (22) is connected to the first diaphragm layer (21), and the other side is connected to the connecting piece (23); Wherein, a flange (211) is provided on a side of the first diaphragm layer (21) away from the second diaphragm layer (22), and a diaphragm convex ring (212) is provided on the inner wall of the flange (211).
2. The composite diaphragm for a diaphragm valve according to claim 1, characterized in that: The connecting member (23) comprises: a boss portion (231) and a connecting portion (232); wherein The boss portion (231) is located inside the second diaphragm layer (22) and is welded to the second diaphragm layer (22).
3. The composite diaphragm for a diaphragm valve according to claim 2, characterized in that: The second membrane layer (22) is evenly distributed with wire mesh (24); wherein At the boss portion (231), the wire mesh (24) is located above the boss portion (231).
4. The composite diaphragm for a diaphragm valve according to claim 3, characterized in that: The boss portion (231) is provided with a plurality of through holes (233).
5. The composite diaphragm for a diaphragm valve according to claim 1, characterized in that: The connecting piece (23) and the second diaphragm layer (22) are integrally formed and made of the same material.
6. The composite diaphragm for a diaphragm valve according to claim 1, characterized in that: The elastic modulus of the first diaphragm layer (21) is smaller than that of the second diaphragm layer (22); The edge of the second diaphragm layer (22) is bent toward the first diaphragm layer (21); Wherein, at the maximum valve opening amount, the second diaphragm layer (22) presses the first diaphragm layer (21).
7. A diaphragm valve, characterized in that: include: A valve body (1) having a boss (11) disposed therein, wherein the boss (11) is provided with an annular sealing groove (12); The composite membrane (2) according to any one of claims 1 to 6; The composite diaphragm (2) is pressurized so that the flange (211) is pressed into the annular sealing groove (12), and the diaphragm convex ring (212) is tightened in the annular sealing groove (12).
8. The diaphragm valve according to claim 7, characterized in that The elastic modulus of the first diaphragm layer (21) is smaller than that of the second diaphragm layer (22); The edge of the second diaphragm layer (22) is bent toward the first diaphragm layer (21); Wherein, at the maximum valve opening amount, the second diaphragm layer (22) presses the first diaphragm layer (21) onto the boss (11).
9. The diaphragm valve according to claim 8, characterized in that The valve body (1) is provided with a flow channel (13) and a diaphragm mounting groove (14); The middle part of the bottom of the diaphragm installation groove (14) is in communication with the flow channel (13), and the edge of the bottom of the groove forms the boss (11); An annular protrusion (16) is provided on the upper surface of the boss (11), and the annular protrusion (16) is located on the inner circle of the annular sealing groove (12); Wherein, the first diaphragm layer (21) is pressed tightly against the annular protrusion (16); A blocking protrusion (15) is provided in the flow channel (13); The direction of the blocking protrusion (15) is arranged orthogonally to the direction of the flow channel (13), and the composite membrane (2) is pressed to fit the blocking protrusion (15) to cut off the flow channel (13).
10. A method for using the diaphragm valve according to claim 7, characterized in that: include: The first diaphragm layer (21) of the composite diaphragm (2) is pressed onto the boss (11) of the valve body (1), and the flange (211) of the first diaphragm layer (21) is pressed into the annular sealing groove (12) of the boss (11); The first diaphragm layer (21) of the composite diaphragm (2) opens and closes the flow channel (13) by driving the connecting piece (23) of the composite diaphragm (2) to rise and fall; Wherein, at the maximum valve opening amount, the second diaphragm layer (22) of the composite diaphragm (2) presses the first diaphragm layer (21) of the composite diaphragm (2) onto the boss (11).