Sealing stop valve

Abstract

The invention discloses a sealing stop valve, and relates to the technical field of sealing stop valves. The sealing stop valve comprises a valve body, a valve seat fixedly connected into an inner cavity of the valve body, a valve cylinder fixedly connected to the upper portion of the valve body and a valve rod connected into the valve cylinder in a threaded mode, and the lower end of the valve rod is provided with an inserting and embedding type valve clack used for being matched with the valve seat to enable the valve body to be closed in a multi-stage mode. A sweeping and scraping mechanism used for automatically cleaning sediments on the upper surface of the valve seat when the valve body is in a communicating state is arranged on the inserting and embedding type valve clack, the locking part is used for ensuring the sealing performance when the inserting and embedding type valve clack and the valve seat abut against each other, multi-contact sealing is achieved through the inserting and embedding type valve clack, scouring force is effectively dispersed, and sealing redundancy is improved; meanwhile, a sweeping and scraping mechanism is synchronously driven in the opening and closing process of the inserting and embedding type valve clack to clean scale deposit on the valve seat, tight attachment is guaranteed, a locking part prevents the valve rod from rotating, constant pressing force is kept, the sealing reliability is overall improved, and the service life is overall prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of sealed stop valves, in particular to a sealed stop valve. Background Art

[0002] A sealed stop valve is an on-off valve commonly used in industrial pipelines. Its main function is to open or close the fluid medium. Its structural feature is that the valve stem is driven up and down by rotating the handwheel, so that the valve disc contacts or separates from the valve seat, thereby realizing fluid on-off control. The working principle is: when the valve is open, the valve stem drives the valve disc to move upward, and the medium can flow along the pipeline; when the valve is closed, the valve stem drives the valve disc downward to press the valve seat, blocking the fluid flow and achieving sealing.

[0003] Existing sealed stop valves usually use the valve disc to touch the valve seat to achieve circuit breaking sealing, that is, the valve disc simply presses its own end face against the valve seat surface to achieve sealing when closed. Although this structure is simple, the sealing performance is average. Especially after long-term use, a gap will be generated between the valve disc and the valve seat due to factors such as medium erosion, opening and closing wear, and leakage will occur. Moreover, during the long-term use of the stop valve, the surface of the valve seat is prone to sedimentation or scaling due to impurities in the fluid. These scales will further hinder the close fit between the valve disc and the valve seat. Since the valve seat is inside the valve cavity, the structure is relatively hidden. At the same time, the valve cavity is closed and the space is small, it is also difficult to clean these attached impurities, and they cannot be cleaned in time, resulting in sealing failure.

[0004] In addition, in the existing sealing stop valve structure, the valve disc usually relies on the spiral transmission of the valve stem to achieve opening and closing actions. The rotation of the valve stem drives its axial movement, thereby pressing the valve disc or loosening the valve seat surface. Since the valve stem in most conventional designs lacks an effective locking or limiting mechanism, it only relies on the friction of the spiral structure itself to maintain its position. During actual operation, especially when the valve is closed, if a water hammer effect or instantaneous pressure fluctuation occurs in the pipeline, the impact force of the medium will directly act on the valve disc. Since the valve disc and the valve stem are a rigid connection structure, this impact force may be transmitted to the valve stem, causing the valve stem to rotate slightly. Once the valve stem rotates due to the impact, the valve disc originally pressed against the valve seat will lose part of the clamping force, thereby reducing the fit effect between the sealing surfaces, causing the sealing performance to further deteriorate or even leakage. Summary of the Invention

[0005] The present invention provides a sealing stop valve, which solves the technical problem that the existing sealing stop valve is prone to leakage due to medium erosion and opening and closing wear during long-term use, resulting in a gap between the valve disc and the valve seat, and the valve seat surface is prone to adherence of impurities and scaling. Since the valve seat is located inside the valve cavity and has a closed structure, it is difficult to clean, further affecting the sealing effect. In addition, the valve disc is mostly opened and closed by a valve stem spiral drive, and the valve stem generally lacks a locking or limiting device. When impacted by the water hammer effect, the valve stem may rotate, resulting in a weakening of the valve disc pressing force and a loose fit of the sealing surface, thereby causing leakage.

[0006] The present invention provides a sealed stop valve, comprising a valve body, a valve seat fixedly connected to a cavity of the valve body, a valve cylinder fixedly connected to an upper portion of the valve body, and a valve stem threadedly connected to the valve cylinder. The lower end of the valve stem is provided with a plug-in valve disc for cooperating with the valve seat to achieve multi-stage closed-circuit of the valve body. The plug-in valve disc is provided with a sweeping mechanism for automatically cleaning deposits on the upper surface of the valve seat when the valve body is in a connected state. The plug-in valve disc includes a convex disc rotatably connected to the lower end of the valve stem and an annular baffle slidably mounted on the outside of a cylindrical section of the convex disc via a guide assembly. A sealing assembly for enhancing sealing between the annular baffle and the convex disc is provided between the annular baffle and the convex disc. A pressing assembly for causing the annular baffle to tightly contact the upper portion of the valve seat is provided between the annular baffle and the convex disc. A locking portion for indirectly limiting the position of the plug-in valve disc contacting the valve seat is provided between the valve cylinder and the valve stem. The locking portion is used to ensure sealing when the plug-in valve disc and the valve seat contact each other.

[0007] In one possible implementation, the scraping mechanism includes a plurality of mounting grooves equidistantly arranged on the lower end surface of the annular baffle, and the upper groove wall of each mounting groove is hinged with two parallel connecting rods, and the lower ends of the corresponding two connecting rods are hinged with a brush plate, and a top spring is fixedly connected between the brush plate and the mounting groove.

[0008] In one possible implementation, the locking portion includes a guide groove provided on the valve stem along the axial direction of the valve stem, a rotating shaft slidingly connected in the guide groove, and a swivel seat rotatably connected to the upper part of the inner cavity of the valve cylinder. A handwheel is fixedly connected to the outside of the swivel seat. The cross-sections of the guide groove and the rotating shaft are both polygonal. The swivel seat is fixedly connected to the upper end of the rotating shaft. A columnar groove is provided on the swivel seat. A plurality of plug posts are circumferentially equidistantly slidably connected to the swivel seat, and the plug posts are distributed radially along the swivel seat. A plurality of jacks are circumferentially equidistantly provided on the inner wall of the valve cylinder. A control component for controlling the movement of the plug posts so as to cooperate with the jacks is provided in the columnar groove.

[0009] In one possible implementation, the control and movement assembly includes a screw threadedly connected to a swivel seat, the lower end of the screw is fixedly connected to a mounting plate, and the lower part of the mounting plate is circumferentially equidistantly hinged with several push rods corresponding to the insertion columns, and the lower ends of the push rods are hinged to the outside of the corresponding insertion columns.

[0010] In a possible implementation, a limit lever is fixedly connected to the mounting groove and is used to cooperate with the connecting rod to limit the movement stroke of the brush plate.

[0011] In a possible implementation, the guide assembly includes a plurality of guide holes circumferentially equidistantly provided on the upper portion of the annular baffle and a plurality of guide slides circumferentially equidistantly fixedly connected to the lower portion of the convex disk for cooperating with the guide holes.

[0012] In one possible implementation, the sealing assembly includes several annular grooves that are sequentially opened on the upper end surface of the annular baffle from the inside to the outside, and the annular grooves are concentrically distributed. The lower part of the disc-shaped section on the convex disc is fixedly connected with several elastic annular sealing rings that are equidistantly connected from the inside to the outside for cooperating with the annular grooves.

[0013] In a possible implementation, the pressing assembly includes an annular embedding groove formed on the annular baffle plate, and a return spring is fixedly connected between the annular embedding groove and the convex plate.

[0014] It can be seen from the above technical solutions that the present invention has the following advantages:

[0015] In the present invention, the annular baffle and the convex disc in the plug-in valve disc cooperate with each other to respectively touch the upper side of the valve seat and be embedded in the inside of the valve seat, thereby forming multiple contact sealing surfaces and performing multiple sealing from multiple directions. The plug-in structure disperses the medium scouring force in multiple directions, reduces the wear of a single contact surface caused by medium scouring, extends the service life, and has a stronger redundant sealing capability.

[0016] In the present invention, the annular baffle plate is used to rotate and move longitudinally each time it contacts and separates from the valve seat, thereby synchronously driving the scraping mechanism to automatically and timely clean the dirt on the surface of the valve seat, preventing long-term accumulation of impurities and scale, maintaining a good fit between the annular baffle plate and the valve seat, and improving sealing reliability.

[0017] In the present invention, the plug-in column and the plug-in hole in the locking part are combined to effectively lock the valve stem after the valve body is opened and closed, preventing it from rotating uncontrollably due to the impact of the medium, eliminating the loosening of the plug-in valve disc at the source, maintaining a constant clamping force of the plug-in valve disc on the valve seat, avoiding leakage caused by weakening of the fitting force, and improving the sealing reliability under long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of the sealed stop valve provided by the present invention.

[0020] Figure 2 This is a schematic cross-sectional structural diagram of the sealed stop valve provided by the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the plug-in valve disc provided by the present invention when viewed from above.

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the plug-in valve disc provided by the present invention.

[0023] Figure 5 The present invention provides Figure 4 Schematic diagram of the enlarged structure of part A in .

[0024] Figure 6 This is a schematic diagram of the annular baffle structure provided by the present invention.

[0025] Figure 7 This is a schematic cross-sectional structural diagram of the connection between the swivel seat and the valve cylinder provided by the present invention.

[0026] Figure 8 This is a schematic cross-sectional view of the connection structure between the rotating shaft and the valve stem provided by the present invention.

[0027] Figure 9 This is a schematic cross-sectional structural diagram of the locking portion provided by the present invention.

[0028] The above drawings include the following reference numerals:

[0029] 1. Valve body; 2. Valve seat; 3. Valve cylinder; 4. Valve stem; 5. Plug-in valve disc; 51. Convex disc; 52. Guide assembly; 521. Guide hole; 522. Guide slide; 53. Annular baffle; 54. Sealing assembly; 541. Annular groove; 542. Elastic annular sealing ring; 55. Pressing assembly; 551. Annular embedded groove; 552. Return spring; 6. Scraping mechanism; 61. Mounting groove; 62. Connecting rod; 63. Brush plate; 64. Top spring; 65. Limit lever; 7. Locking part; 71. Guide groove; 72. Rotating shaft; 73. Rotating seat; 74. Handwheel; 75. Column groove; 76. Insert column; 77. Socket; 78. Control and shift assembly; 781. Screw; 782. Mounting disc; 783. Push rod. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] See also Figure 1 、 Figure 2 and Figure 3 The present invention provides a technical solution: a sealed stop valve, comprising a valve body 1, a valve seat 2 fixedly connected to the inner cavity of the valve body 1, a valve cylinder 3 fixedly connected to the upper part of the valve body 1 and a valve stem 4 threadedly connected to the valve cylinder 3, a plug-in valve disc 5 is provided at the lower end of the valve stem 4 for cooperating with the valve seat 2 to make the valve body 1 multi-stage closed-circuit, a scraping mechanism 6 is provided on the plug-in valve disc 5 for automatically cleaning the deposits on the surface of the valve seat 2 when the valve body 1 becomes a connected state, a locking portion 7 for indirectly limiting the position of the plug-in valve disc 5 that contacts the valve seat 2 is provided between the valve cylinder 3 and the valve stem 4, the locking portion 7 is used to ensure the sealing performance of the plug-in valve disc 5 and the valve seat 2 when the two contact each other.

[0032] See also Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 In this embodiment, the plug-in valve disc 5 includes a convex disc 51 rotatably connected to the lower end of the valve stem 4 and an annular baffle 53 slidably mounted on the outside of the cylindrical section of the convex disc 51 through a guide assembly 52. A sealing assembly 54 is provided between the annular baffle 53 and the convex disc 51 to enhance the sealing performance between the two. A pressing assembly 55 is provided between the annular baffle 53 and the convex disc 51 to make the annular baffle 53 tightly contact the upper part of the valve seat 2. The guide assembly 52 includes a plurality of guide holes 521 equidistantly arranged on the upper part of the annular baffle 53 and a plurality of equidistantly arranged guide holes 521 on the upper part of the annular baffle 53. A guide slide 522 is fixedly connected to the lower part of the convex disk 51 for cooperating with the guide hole 521. The sealing assembly 54 includes a plurality of annular grooves 541 which are sequentially opened on the upper end surface of the annular baffle 53 from the inside to the outside, and the annular grooves 541 are concentrically distributed. A plurality of elastic annular sealing rings 542 for cooperating with the annular grooves 541 are fixedly connected to the lower part of the disc-shaped segment on the convex disk 51 at equal distances from the inside to the outside. The top pressure assembly 55 includes an annular embedded groove 551 opened on the annular baffle 53, and a return spring 552 is fixedly connected between the annular embedded groove 551 and the convex disk 51.

[0033] When the stop valve needs to be closed: the valve stem 4 is controlled to rotate by manually rotating the locking portion 7. The valve stem 4 rotates and interacts with the valve cylinder 3 which is threadedly matched with it to move downward. The valve stem 4 then drives the convex disc 51 to move downward and rotate. The convex disc 51 then drives the annular baffle 53 to move downward through the return spring 552, and then drives the annular baffle 53 to rotate synchronously through the guide slide 522 and the guide hole 521. When the annular baffle 53 moves down and contacts the upper end surface of the valve seat 2, the annular baffle 53 stops moving downward, and the valve stem 4 continues to drive the convex disc 51 to move downward. The convex disc 51 then squeezes the return spring 552 to compress the annular baffle 53, so that the annular baffle 53 is tightly pressed against the valve seat 2. When the annular baffle 53 is in contact with the upper surface of the valve seat 2 and the convex disc 51 is inserted into the through hole in the middle of the valve seat 2, the valve seat 2 can be blocked in multiple directions by the annular baffle 53. The sealing reliability between the plug-in valve disc 5 and the valve seat 2 is improved.

[0034] When the stop valve is opened: the valve stem 4 is manually controlled to reverse and move upward, and the valve stem 4 then drives the convex disc 51 to move upward, and the convex disc 51 then gradually moves out of the through hole in the middle of the valve seat 2. Then the convex disc 51 drives the annular baffle 53 to move upward through the return spring 552, so that the annular baffle 53 is separated from the valve seat 2, and then continues to drive the annular baffle 53 to rise a distance, so that the stop valve can be turned into an open state.

[0035] See also Figure 2 、 Figure 7 、 Figure 8 and Figure 9 In this embodiment, the locking portion 7 includes a guide groove 71 provided on the valve stem 4 along the axial direction of the valve stem 4, a rotating shaft 72 slidingly connected to the guide groove 71, and a rotating seat 73 rotatably connected to the upper part of the inner cavity of the valve cylinder 3. The external part of the rotating seat 73 is fixedly connected to a handwheel 74. The cross sections of the guide groove 71 and the rotating shaft 72 are both polygonal. The rotating seat 73 is fixedly connected to the upper end of the rotating shaft 72. A columnar groove 75 is provided on the rotating seat 73. A plurality of plug posts 76 are equidistantly slidably connected to the rotating seat 73 in the circumferential direction. 6 are radially distributed along the swivel seat 73. A plurality of insertion holes 77 are equidistantly provided on the inner wall of the valve cylinder 3 in the circumferential direction. A control shift assembly 78 for controlling the movement of the insertion column 76 so as to cooperate with the insertion hole 77 is provided in the columnar groove 75. The control shift assembly 78 includes a screw 781 threadedly connected to the swivel seat 73. The lower end of the screw 781 is fixedly connected to the mounting plate 782. The lower part of the mounting plate 782 is hinged with a plurality of push rods 783 corresponding to the insertion column 76 at equidistant intervals in the circumferential direction. The lower end of the push rod 783 is hinged to the outside of the corresponding insertion column 76.

[0036] The swivel seat 73 is rotated by manually turning the hand wheel 74, and the swivel seat 73 then drives the rotating shaft 72 to rotate, and the rotating shaft 72 then drives the valve stem 4 to rotate. During the rotation process of the valve stem 4, it can move longitudinally by interacting with the valve cylinder 3 threadedly connected thereto. When the valve stem 4 moves axially to a suitable position, the hand wheel 74 is stopped, and the rotating screw 781 is then manually turned. The screw 781 rotates and moves downward, and then drives the mounting plate 782 to move downward. The mounting plate 782 then drives the push rod 783 to move downward and rotate around the hinge. The push rod 783 then pushes the plug post 76 to move in the direction away from the axis of the mounting plate 782. When the cam 781 is in the closed position, the cam 782 is in the closed position, and the cam 783 is in the closed position, so that the cam 783 is in the open position, and the cam 783 is in the closed position, so that the cam 783 can be turned round and rotated.

[0037] See also Figure 3 、 Figure 4 and Figure 5 In this embodiment, the scraping mechanism 6 includes a plurality of mounting grooves 61 equidistantly arranged on the lower end surface of the annular baffle 53 in the circumferential direction. The upper groove wall of each mounting groove 61 is hinged with two parallel connecting rods 62. The lower ends of the corresponding two connecting rods 62 are hinged with a brush plate 63. A top spring 64 is fixedly connected between the brush plate 63 and the mounting groove 61. A limit lever 65 is fixedly connected to the mounting groove 61 for cooperating with the connecting rod 62 to limit the moving stroke of the brush plate 63.

[0038] When the valve stem 4 indirectly drives the annular baffle 53 to move up and separate from the valve seat 2, the compressed top spring 64 resets and pushes the brush plate 63 to move downward, and the brush plate 63 then drives the connecting rod 62 to rotate. The connecting rod 62 rotates around the hinge point. The corresponding two connecting rods 62 keep the brush plate 63 in a horizontal state. After the brush plate 63 moves down, it touches the upper surface of the valve seat 2. The annular baffle 53 moves up and rotates at the same time, and then drives the brush plate 63 to rotate synchronously in the circumferential direction, automatically cleaning the dirt on the upper surface of the valve seat 2 until the connecting rod 6 2 abuts against the limit lever 65, at this time the connecting rod 62 is still in an inclined state; when the valve stem 4 drives the annular baffle 53 to move downward and gradually abut against the upper end surface of the valve seat 2, the annular baffle 53 will drive the brush plate 63 to first abut against the surface of the valve seat 2, and then as the annular baffle 53 continues to move downward, the connecting rod 62 in the inclined state is pressed and rotated to gradually retract into the installation groove 61, and the connecting rod 62 then drives the brush plate 63 to move and finally retract into the installation groove 61, at this time the annular baffle 53 abuts against the upper surface of the valve seat 2.

[0039] During operation, the valve stem 4 is indirectly driven to rotate by turning the hand wheel 74. The valve stem 4 rotates downward and drives the plug-in valve disc 5 to move downward, so that the plug-in valve disc 5 touches the valve seat 2, and the stop valve can be changed to a closed state. Then the locking part 7 is controlled to lock the valve stem 4 to a limit position to ensure the position stability of the plug-in valve disc 5. When the stop valve needs to be opened, the locking part 7 is first controlled to unlock the valve stem 4. Then the hand wheel 74 is turned reversely to drive the valve stem 4 to rotate in the opposite direction. The valve stem 4 reverses and moves upward to drive the plug-in valve disc 5 to move upward. During the upward movement of the plug-in valve disc 5, the sweeping mechanism 6 is triggered to operate. The sweeping mechanism 6 cleans the impurities accumulated on the surface of the valve seat 2 until the plug-in valve disc 5 is completely separated from the valve seat 2.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations 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 should not be understood as limiting the present invention.

[0041] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature designated as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sealed stop valve, comprising a valve body, a valve seat fixedly connected to the inner cavity of the valve body, a valve cylinder fixedly connected to the upper part of the valve body, and a valve stem threadedly connected to the valve cylinder, characterized in that: The lower end of the valve stem is provided with an insert-type valve disc for cooperating with the valve seat to achieve multi-stage closed circuit of the valve body. The insert-type valve disc is provided with a sweeping mechanism for automatically cleaning the deposits on the surface of the valve seat when the valve body becomes connected; The plug-in valve disc includes a convex disc rotatably connected to the lower end of the valve stem and an annular baffle slidably mounted on the outside of the cylindrical section of the convex disc through a guide assembly. A sealing assembly for enhancing the sealing between the annular baffle and the convex disc is provided between the annular baffle and the convex disc. A pressing assembly for making the annular baffle tightly contact the upper part of the valve seat is provided between the annular baffle and the convex disc. A locking portion is provided between the valve cylinder and the valve stem for indirectly limiting the position of the plug-in valve disc that contacts the valve seat. The locking portion is used to ensure the sealing performance of the plug-in valve disc and the valve seat when they contact each other.

2. A sealed stop valve according to claim 1, characterized in that: The scraping mechanism includes a plurality of mounting grooves equidistantly arranged on the lower end surface of the annular baffle, and the upper groove wall of each mounting groove is hinged with two parallel connecting rods, and the lower ends of the corresponding two connecting rods are hinged with a brush plate, and a top spring is fixedly connected between the brush plate and the mounting groove.

3. A sealed stop valve according to claim 1, characterized in that: The locking portion includes a guide groove provided on the valve stem along the axial direction of the valve stem, a rotating shaft slidingly connected in the guide groove, and a swivel seat rotatably connected to the upper part of the inner cavity of the valve cylinder. A handwheel is fixedly connected to the outside of the swivel seat. The cross-sections of the guide groove and the rotating shaft are both polygonal. The swivel seat is fixedly connected to the upper end of the rotating shaft. A columnar groove is provided on the swivel seat. A plurality of plug posts are circumferentially equidistantly slidably connected to the swivel seat, and the plug posts are distributed radially along the swivel seat. A plurality of jacks are circumferentially equidistantly provided on the inner wall of the valve cylinder. A control shift component for controlling the movement of the plug posts so as to cooperate with the jacks is provided in the columnar groove.

4. A sealed stop valve according to claim 3, characterized in that: The control shift assembly includes a screw threadedly connected to the swivel seat, the lower end of the screw is fixedly connected to the mounting plate, the lower part of the mounting plate is circumferentially equidistantly hinged with several push rods corresponding to the plug posts, and the lower ends of the push rods are hinged to the outside of the corresponding plug posts.

5. A sealed stop valve according to claim 2, characterized in that: A limit lever is fixedly connected to the mounting groove and is used to cooperate with the connecting rod to limit the moving stroke of the brush plate.

6. A sealed stop valve according to claim 1, characterized in that: The guide assembly comprises a plurality of guide holes equidistantly arranged on the upper part of the annular baffle plate and a plurality of guide slides equidistantly fixedly connected to the lower part of the convex plate for cooperating with the guide holes.

7. The sealed stop valve according to claim 1, characterized in that: The sealing assembly includes several annular grooves which are sequentially opened on the upper end surface of the annular baffle from the inside to the outside, and the annular grooves are concentrically distributed. The lower part of the disc-shaped section on the convex disc is fixedly connected with several elastic annular sealing rings which are equidistantly connected from the inside to the outside to cooperate with the annular grooves.

8. The sealed stop valve according to claim 1, characterized in that: The pressing assembly includes an annular embedding groove formed on the annular baffle plate, and a reset spring is fixedly connected between the annular embedding groove and the convex plate.

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