Globe valve and its working method

Abstract

The present invention belongs to the technical field of engineering components, and specifically relates to valves, in particular to stop valves and their working methods; one type of stop valve comprises: a valve body, which is provided with an accommodating cavity therein, and has inlet and outlet flow channels connected to the accommodating cavity at both ends; a valve disc, which is arranged to be raised and lowered in the accommodating cavity; a valve seat, which is arranged on the bottom wall of the accommodating cavity and is located below the valve disc, and is used to connect the inlet and outlet flow channels; the valve seat is provided with a plurality of guide holes along the radial direction; an adjusting sealing assembly, which is located below the valve disc and includes an adjusting plate slidably arranged in the guide hole; wherein, when the valve disc moves upward to open the valve body, the adjusting plate slides outward to make the inner wall of the valve seat concave; when the valve disc moves downward to close the valve body, each adjusting plate moves inward to tighten the outer wall of the valve disc. By adjusting the cooperation between the sealing assembly and the valve disc, the impact of the fluid on the valve disc can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering components, and in particular relates to a valve, and in particular to a stop valve and a working method thereof. Background Art

[0002] As an extremely important shut-off valve, the globe valve is sealed by applying torque to the valve stem. The valve stem applies pressure to the valve disc in the axial direction, so that the sealing surface of the valve disc fits tightly with the sealing surface of the valve seat, preventing the medium from leaking along the gap between the sealing surfaces.

[0003] The force applied to close a globe valve is greater than the force applied to open it. Therefore, for ease of use, a drive mechanism is typically installed on the globe valve to drive the axial movement of the valve stem. However, when the globe valve is open, the fluid within the valve body flows through the disc. The fluid impacting the disc creates vibrations and torque fluctuations that are transmitted through the valve stem to the drive mechanism. In particular, the high-frequency vibrations can accelerate wear of the drive mechanism's transmission components (such as gears and worms).

[0004] Therefore, how to reduce valve disc vibration and torque fluctuation is a technical problem that needs to be solved urgently in this field.

[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 related technology. Summary of the Invention

[0006] The embodiments of the present disclosure at least provide a stop valve and a working method thereof.

[0007] In a first aspect, an embodiment of the present disclosure provides a stop valve, comprising:

[0008] The valve body has an accommodating cavity therein, and both ends of the valve body are respectively provided with inlet and outlet flow channels communicating with the accommodating cavity;

[0009] A valve seat is arranged on the bottom wall of the accommodating cavity, and the valve seat is provided with a plurality of guide through holes along the radial direction;

[0010] A valve flap, which is arranged in the accommodating cavity and is used to open and close the valve seat;

[0011] An adjusting seal assembly is located below the valve disc and includes an adjusting plate slidably disposed in each guide through hole;

[0012] When the valve disc moves upward to open the valve body, each of the regulating pieces slides outward to make the inner wall of the valve seat concave;

[0013] When the valve disc moves downward to close the valve body, the adjusting plates move inward to tighten the outer wall of the valve disc.

[0014] In an optional embodiment, the valve seat is provided with a fixed ring groove along the axial direction, and the fixed ring groove is communicated with the guide through hole.

[0015] In an optional embodiment, the regulating seal assembly includes a sealing ring, which is lifted and lowered in the fixed ring groove, and the upper end of which protrudes from the valve seat;

[0016] A plurality of said adjusting pieces are arranged along the circumference of the sealing ring, and the lower end of the sealing ring is suitable for being inserted into the arc groove of the adjusting piece;

[0017] When the valve disc opens, the sealing ring moves upward and the adjusting pieces slide outward to make the inner wall of the valve seat concave;

[0018] When the valve disc is closed, the sealing ring pushes each adjusting piece to slide inward until the inner end wall of each adjusting piece clamps the outer wall of the valve disc;

[0019] The outer end of the regulating piece is retracted into the guide through hole to increase the space in the accommodating cavity.

[0020] In an optional embodiment, a plurality of limit blocks are evenly distributed on the outer wall of the sealing ring, and the limit blocks are arranged along the axial direction of the sealing ring;

[0021] The inner wall of the fixed ring groove is provided with a plurality of limiting grooves adapted to the limiting blocks;

[0022] A return spring is provided in the limiting groove, and two ends of the return spring are respectively in contact with the bottom wall of the limiting block and the bottom wall of the limiting groove. The return spring is suitable for pushing the sealing ring to move upward.

[0023] In an optional embodiment, the slot width of the circular arc groove along the radial direction of the regulating plate is greater than the thickness of the sealing ring, and the lower end of the sealing ring is suitable for being inserted into the circular arc groove.

[0024] In an optional embodiment, the bottom wall of the sealing ring is provided with a plurality of adjustment grooves along the axial direction, and the adjustment grooves are located between two adjacent adjustment pieces;

[0025] When the sealing ring pushes each adjusting piece to slide inward to clamp the outer wall of the valve disc, the top wall of the adjusting groove abuts against the surface of the adjusting piece.

[0026] In an optional embodiment, the slot length of the arc groove in the circumferential direction is not less than the arc length between two adjacent adjustment grooves, so that the sealing ring pushes the adjustment plate to move inward after being inserted into the arc groove.

[0027] In an optional embodiment, the arc groove is provided with a first inclined surface on a side wall close to the valve seat axis;

[0028] The bottom wall of the sealing ring is provided with a second inclined surface, and the second inclined surface has the same inclination angle and inclination direction as the first inclined surface;

[0029] When the sealing ring moves downward, the second inclined surface abuts against the first inclined surface to push each adjusting piece to slide inward.

[0030] In an optional embodiment, a sealing groove is provided on the upper outer wall of the valve disc, and the sealing ring is suitable for being inserted into the sealing groove.

[0031] In an optional embodiment, a sealing elastic piece is sleeved and fixed on the outer wall of the valve disc, and the outer wall of the sealing elastic piece is fixed to the inner wall of the accommodating cavity.

[0032] In a second aspect, the present disclosure also provides a method for operating a stop valve, the method comprising:

[0033] When the valve disc moves upward to open the valve body, the regulating piece slides outward to make the inner wall of the valve seat concave;

[0034] When the valve disc moves downward to close the valve body, the adjusting plates move inward to tighten the outer wall of the valve disc to seal between the valve disc and the valve seat.

[0035] The beneficial effect of the present invention is that the present invention provides a stop valve and a working method thereof, by adjusting the coordination of the sealing assembly, the valve seat and the valve disc, when the valve disc opens the valve seat, each adjustment piece moves outward to make the inner wall of the valve seat concave, thereby slowing down the flow rate of the fluid passing through the valve seat and reducing the impact force of the fluid on the valve disc.

[0036] Other features and advantages of the present invention will be described in the following description, and in part will 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.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited herein and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 An internal perspective view of a stop valve provided in an embodiment of the present disclosure;

[0040] Figure 2 A perspective view of an adjustable seal assembly provided in accordance with an embodiment of the present disclosure;

[0041] Figure 3 A cutaway perspective view of an adjustable seal assembly provided in accordance with an embodiment of the present disclosure;

[0042] Figure 4 A front view of the valve flap in an open state provided by an embodiment of the present disclosure;

[0043] Figure 5 This is a front view of the valve flap in the closed state provided by an embodiment of the present disclosure.

[0044] In the picture:

[0045] 1. Valve body; 10. Accommodation chamber;

[0046] 2. Valve seat; 20. Guide hole; 21. Fixed ring groove; 22. Limit groove;

[0047] 3. Valve disc; 30. Sealing groove; 31. Sealing spring;

[0048] 4. Adjusting seal assembly; 40. Adjusting plate; 41. Sealing ring; 42. Limiting block; 44. Return spring; 45. Arc groove; 46. Adjusting groove; 47. First inclined surface; 48. Second inclined surface. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] In this document, 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 that a third component may be interposed between the first component and the second component. In addition, in the drawings, the thickness of components may be exaggerated or reduced in order to effectively describe technical content.

[0051] 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..." when following a list of elements modify the entire list of elements. 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.

[0052] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an" and "the" may also be intended to include plural forms, unless otherwise clearly indicated herein. 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 particular order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0053] 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. Thus, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such 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 advantageous over other implementations, aspects, or designs. Instead, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0054] Research has found that in related technologies, the force applied when closing a globe valve is greater than when opening it. Therefore, to improve efficiency, a drive device is often installed on the globe valve to drive the axial movement of the valve stem. However, when the globe valve is open, the fluid in the valve body flows through the valve disc. The vibration and torque fluctuations generated by the fluid impacting the valve disc are transmitted through the valve stem to the drive device. In particular, the high-frequency vibration accelerates the wear of the transmission components (such as gears and worms) in the drive device.

[0055] Therefore, how to slow down the impact of fluid on the valve flap is a technical problem that urgently needs to be solved in this field.

[0056] The defects in the above solutions and the causes of their occurrence are the results obtained by the inventors after practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed by the present disclosure in this article should be the contributions made by the inventors to the present disclosure during the disclosure process.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0058] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0059] like Figures 1 to 5 As shown, at least one embodiment provides a stop valve, comprising: a valve body 1, within which is disposed an accommodating chamber 10, with inlet and outlet passages communicating with the accommodating chamber 10 respectively formed at both ends of the valve body 1; the valve body 1 being a stop valve; preferably, a driving device is disposed at the upper end of the valve body 1, a valve flap 3 is fixed to a valve stem, the valve stem being fixed to the movable end of the driving device, and the driving device drives the valve flap 3 vertically up and down via the valve stem to open or close the valve seat 2. The valve seat 2 is disposed on the bottom wall of the accommodating chamber 10 and is used to connect the inlet and outlet passages; after a fluid flows into the valve body 1 through the inlet passage, it passes through the valve seat 2 and flows to the outlet passage. The valve disc 3 is arranged to rise and fall within the accommodating cavity 10 and is used to open and close the valve seat 2. The valve seat 2 is radially defined with a plurality of guide holes 20. The adjusting disc 40 forms a sliding seal with the guide holes 20. When the adjusting disc 40 slides horizontally within the guide holes 20, fluid within the valve seat 2 does not flow outward through the gap between the inner wall of the guide holes 20 and the outer wall of the adjusting disc 40. The adjusting seal assembly 4, located below the valve disc 3, includes an adjusting disc 40 that slides within the guide holes 20. When the valve disc 3 moves upward to open the valve body 1, the adjusting disc 40 slides outward along the guide holes 20, causing the inner wall of the valve seat 2 to become concave. The concave inner wall of the valve seat 2 reduces the flow velocity of fluid flowing through the concave inner wall compared to a valve seat 2 with a smooth inner wall. This reduced flow velocity mitigates the impact force of the fluid on the valve disc 3, thereby reducing the vibration of the valve disc 3. Furthermore, when the adjusting disc 40 moves outward and inserts into the valve body 1, it improves the stability of the valve body 1. When the valve disc 3 moves downward to close the valve body 1, the adjusting plates 40 move inward to tighten the outer wall of the valve disc 3. By adjusting the coordination of the sealing assembly 4, valve seat 2, and valve disc 3, when the valve disc 3 opens the valve seat 2, the adjusting plates 40 move outward to concave the inner wall of the valve seat 2, thereby slowing the flow rate of the fluid passing through the valve seat 2 and reducing the impact force of the fluid on the valve disc 3. In this embodiment, the stop valve only needs to achieve rapid opening and closing, and there is no flow control. Therefore, the opening degree of the stop valve does not need to be considered. In other words, the stop valve of this embodiment has only two operating conditions: fully open and fully closed.

[0060] Reference Attachment Figure 1 The valve seat 2 is provided with a fixed ring groove 21 along the axial direction, and the fixed ring groove 21 is connected to the guide through hole 20. The groove width of the fixed ring groove 21 in the radial direction of the valve seat 2 is consistent with the thickness of the sealing ring 41, and the sealing ring 41 slides and seals with the fixed ring groove 21.

[0061] Reference Attachment Figure 2, the regulating sealing assembly 4 includes: a sealing ring 41, which is set in the fixed ring groove 21 for lifting, and the upper end protrudes from the valve seat 2; the sealing ring 41 is set below the valve disc 3; the upper outer wall of the valve disc 3 is provided with a sealing groove 30, and the sealing ring 41 is suitable for being inserted into the sealing groove 30. When the valve disc 3 moves downward to close the valve seat 2, the upper end of the sealing ring 41 is inserted into the sealing groove 30, and the sealing ring 41 is pushed downward by the valve disc 3. The sealing ring 41 is inserted into the sealing groove 30, which can improve the sealing performance of the valve disc 3. Several regulating plates 40 are evenly distributed along the circumference of the sealing ring 41, and the lower end of the sealing ring 41 is suitable for being inserted into the arc groove 45 of the regulating plate 40; further, an arc groove 45 is provided on the regulating plate 40, and the slot width of the arc groove 45 along the radial direction of the regulating plate 40 is greater than the thickness of the sealing ring 41, and the sealing ring 41 is suitable for being inserted into the arc groove 45. Refer to the attached Figure 4 , Figure 4 The arrows in the figure indicate the direction of water flow. When the valve disc 3 opens, the sealing ring 41 moves upward, and the adjusting discs 40 slide outward, concavely shaping the inner wall of the valve seat 2. When the valve disc 3 opens, fluid flows into the valve seat 2 through the inlet channel. Under the pressure of the water flow, the adjusting discs 40 move outward until their outer walls abut against the inner wall of the accommodating chamber 10. This outward movement of the adjusting discs 40 creates a concave shape on the inner wall of the valve seat 2, slowing the flow of fluid through the valve seat 2. When the valve disc 3 closes, the valve disc 3 pushes the sealing ring 41 downward, and the adjusting discs 40 are pushed inward by the sealing ring 41 to clamp the outer wall of the valve disc 3. Each adjusting disc 40 clamps the valve disc 3 from all sides, while also sharing the static pressure exerted by the fluid on the valve disc 3. The outer ends of the adjusting discs 40 retract into the guide holes 20, increasing the space within the accommodating chamber 10. At this time, the space in the accommodating chamber 10 is increased, and the negative pressure of the water flowing toward the outlet channel can be adsorbed toward the accommodating chamber 10 , thereby preventing liquid from dripping out of the outlet channel of the valve body 1 .

[0062] Reference Attachment Figure 1 and Figure 2 In order to improve the stability of the lifting and lowering movement of the sealing ring 41, the outer wall of the sealing ring 41 is evenly distributed with a number of limit blocks 42, and the limit blocks 42 are arranged along the axial direction of the sealing ring 41; the inner wall of the fixed ring groove 21 is provided with a number of limit grooves 22 adapted to the limit blocks 42; the slot length of the limit grooves 22 is greater than the length of the limit blocks 42, and the length here refers to the length of the limit blocks 42 in the axial direction. A return spring 44 is provided in the limit groove 22, and the two ends of the return spring 44 respectively abut against the bottom wall of the limit block 42 and the bottom wall of the limit groove 22. The return spring 44 is suitable for pushing the sealing ring 41 upward. When the valve disc 3 is in the open state, the return spring 44 pushes the sealing ring 41 upward, so that the lower end of the sealing ring 41 is disengaged from the adjustment groove 46.

[0063] Continue to refer to the attached Figure 2 The bottom wall of the sealing ring 41 is provided with an adjustment groove 46, which is located between two adjacent adjustment pieces 40. When the sealing ring 41 pushes each adjustment piece 40 to slide inward to clamp the outer wall of the valve disc 3, the top wall of the adjustment groove 46 abuts against the surface of the adjustment piece 40. The circumferential length of the arc groove 45 is not less than the arc length between two adjacent adjustment grooves 46, so that the sealing ring 41 can push the adjustment piece 40 inward after being inserted into the arc groove 45. The provision of the adjustment groove 46 enables the lower end of the sealing ring 41 to be inserted into the arc groove 45 when the sealing ring 41 moves downward.

[0064] Reference Attachment Figure 3 The arc groove 45 is provided with a first inclined surface 47 on the axial side wall close to the valve seat 2; the bottom wall of the sealing ring 41 is provided with a second inclined surface 48, and the inclination angle and inclination direction of the second inclined surface 48 are consistent with those of the first inclined surface 47; wherein, when the sealing ring 41 moves downward, the second inclined surface 48 abuts against the first inclined surface 47 to push each adjusting piece 40 to slide inward.

[0065] Reference Attachment Figure 1 A sealing elastic piece 31 is fixed on the outer wall of the valve disc 3 , and the outer wall of the sealing elastic piece 31 is fixed on the inner wall of the accommodating cavity 10 .

[0066] At least one embodiment provides a method for operating a stop valve, the method comprising:

[0067] When the valve disc 3 moves upward to open the valve body 1, the adjusting pieces 40 slide outward to make the inner wall of the valve seat 2 concave; when the valve disc 3 moves downward to close the valve body 1, each adjusting piece 40 moves inward to tighten the outer wall of the valve disc 3 to seal between the valve disc 3 and the valve seat 2.

[0068] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0069] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 limiting the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used herein unless expressly 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.

[0070] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A stop valve, characterized in that: include: A valve body (1) is provided with an accommodating cavity (10) therein, and both ends of the valve body (1) are provided with inlet and outlet flow channels communicating with the accommodating cavity (10); A valve seat (2) is arranged on the bottom wall of the accommodating cavity (10), and the valve seat (2) is radially provided with a plurality of guide through holes (20) from the outer wall to the inner wall thereof; The valve seat (2) is provided with a fixed annular groove (21) along the axial direction, and the fixed annular groove (21) is communicated with the guide through hole (20); A valve flap (3) is arranged in the accommodating cavity (10) and is used to open and close the valve seat (2); The regulating seal assembly (4), which is located below the valve disc (3), includes: An adjusting piece (40) slidably disposed in each guide through hole (20); A sealing ring (41) is arranged in a lifting manner in the fixed ring groove (21), and its upper end protrudes from the valve seat (2); The plurality of regulating pieces (40) are evenly distributed along the circumference of the sealing ring (41), and the lower end of the sealing ring (41) is suitable for being inserted into the arc groove (45) of the regulating piece (40); When the valve disc (3) moves upward to open the valve body (1), the valve disc (3) is separated from the sealing ring (41), and the water flow in the valve seat (2) pushes each of the regulating plates (40) to slide radially outward, and the regulating plates (40) slide radially outward along the guide through hole (20) to make the inner wall of the valve seat (2) concave; When the valve disc (3) moves downward to close the valve body (1), the valve disc (3) pushes the sealing ring (41) downward synchronously, and the sealing ring (41) drives each adjustment piece (40) to slide radially inward along the guide through hole (20) until the inner wall of the adjustment piece (40) fits the outer wall of the valve disc (3); The outer end of the regulating piece (40) is retracted into the guide through hole (20) to increase the space in the accommodating cavity (10).

2. The stop valve according to claim 1, wherein: A plurality of limit blocks (42) are evenly distributed on the outer wall of the sealing ring (41), and the limit blocks (42) are arranged axially along the sealing ring (41); The inner wall of the fixed ring groove (21) is provided with a plurality of limiting grooves (22) adapted to the limiting blocks (42); A return spring (44) is provided in the limiting groove (22), and two ends of the return spring (44) are respectively in contact with the bottom wall of the limiting block (42) and the bottom wall of the limiting groove (22), and the return spring (44) is suitable for pushing the sealing ring (41) to move upward.

3. The stop valve according to claim 1, wherein: The slot width of the circular arc groove (45) along the radial direction of the regulating plate (40) is greater than the thickness of the sealing ring (41), and the lower end of the sealing ring (41) is suitable for being inserted into the circular arc groove (45).

4. The stop valve according to claim 1, wherein: The bottom wall of the sealing ring (41) is provided with a plurality of adjustment grooves (46) along the axial direction, and the adjustment grooves (46) are located between two adjacent adjustment plates (40); When the sealing ring (41) pushes each regulating piece (40) to slide inward to the outer wall of the clamping valve disc (3), the inner top wall of the regulating groove (46) abuts against the surface of the regulating piece (40).

5. The stop valve according to claim 3, wherein: The slot length of the arc groove (45) in the circumferential direction is not less than the arc length between two adjacent adjustment grooves (46), so that the sealing ring (41) can push the adjustment piece (40) to move inward after being inserted into the arc groove (45).

6. The stop valve according to claim 3, wherein: The arc groove (45) is provided with a first inclined surface (47) on the side wall close to the axis of the valve seat (2); The bottom wall of the sealing ring (41) is provided with a second inclined surface (48), and the second inclined surface (48) has the same inclination angle and inclination direction as the first inclined surface (47); When the sealing ring (41) moves downward, the second inclined surface (48) abuts against the first inclined surface (47) to push each adjusting piece (40) to slide inward.

7. The stop valve according to claim 1, wherein: A sealing groove (30) is circumferentially provided on the upper outer wall of the valve flap (3), and the sealing ring (41) is suitable for being inserted into the sealing groove (30).

8. The stop valve according to claim 1, wherein: A sealing spring (31) is sleeved and fixed on the outer wall of the valve disc (3), and the outer wall of the sealing spring (31) is fixed to the inner wall of the accommodating cavity (10).

9. A method for operating a stop valve, characterized in that: Using the stop valve according to any one of claims 1 to 8, the working method includes: When the valve disc (3) moves upward to open the valve body (1), the regulating piece (40) slides outward to make the inner wall of the valve seat (2) concave; When the valve disc (3) moves downward to close the valve body (1), each adjusting piece (40) moves inward to clamp the outer wall of the valve disc (3) to seal the valve disc (3) and the valve seat (2).

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