A semi-ball valve capable of maintenance without water shut-off and maintenance method thereof

Abstract

The present invention relates to the field of valve structure technology, and specifically refers to a hemispherical valve that can be repaired without stopping water flow and a repair method. The valve body comprises a valve body, wherein the valve body is provided with a water inlet and a water outlet at both ends along the water flow direction, and an inspection port is provided at one end along the direction perpendicular to the water flow; a hemispherical body, wherein the hemispherical body is rotatably hingedly connected to the valve body through a driving shaft; a valve cover, wherein the valve cover is fixed to the inspection port through a bolt structure; a main valve seat, wherein the main valve seat is arranged at the water outlet, and is sealedly connected with the hemispherical body when the hemispherical body rotates to the water outlet to close the valve; an inspection valve seat, wherein the inspection valve seat is arranged at the inspection port, and an adjustment structure is arranged between the inspection valve seat and the valve seat; the adjustment structure is used to adjust the position of the inspection valve seat so that the inspection valve seat is sealedly connected with the valve cover when not being repaired, and is sealedly connected with the hemispherical body flipped to the inspection port when being repaired. The present invention has a simple structure, and the valve repair operation is extremely convenient, and the main sealing structure on the valve hemispherical body can be repaired and replaced without stopping water flow.

Description

Technical Field

[0001] The invention relates to the technical field of valve structures, and in particular to a hemispherical valve capable of being repaired without stopping water flow and a repair method. Background Art

[0002] When the ball valve is working, the ball rotates around the center line of the valve body to open and close the valve. Since the eccentric hemispherical valve has the advantages of small flow resistance, good sealing, flexible and easy operation, it has been widely used in various industries. However, the traditional eccentric hemispherical valve has the following shortcomings: 1. The valve is closed by the contact between the ball and the valve seat. The ball rotates so that the opening of the ball faces the valve seat to open the valve. The wear between the ball and the valve seat is large during the switching process, which can easily cause sealing failure; 2. Closing is achieved by the contact between the ball and the valve seat, and the sealing performance is unreliable and the sealing is poor; 3. In daily use, if the valve needs to be repaired, the valve needs to be removed from the pipeline. The operation process is complicated, the workload is large, and it is not convenient for maintenance; 4. The friction torque between the valve stem and the end face of the self-lubricating bearing is large, and the centering between the hemispherical valve core and the valve seat is difficult to adjust.

[0003] In order to solve the above problems, a Chinese utility model patent with the patent number "CN201520550420.7" and the name of "top mounted eccentric semi-ball valve" introduces a semi-ball valve, which includes a semi-ball valve body, a semi-ball valve core is arranged in the semi-ball valve body, a semi-ball valve seat is arranged at the bottom of the semi-ball valve body near the semi-ball valve core, an adjustment pad is arranged between the semi-ball valve seat and the semi-ball valve body, a pressure plate is arranged at the bottom of the semi-ball valve body to match the semi-ball valve seat, and the bottom of the pressure plate is provided with a pressure plate. There are multiple axial holes evenly opened on the part, and each connection hole is provided with a clamping bolt for connecting the hemispherical valve body. The inner circumference of the hemispherical valve seat is evenly opened with multiple connection holes in the horizontal direction. The double eccentric hemispherical valve is convenient for radial and axial fixation of the hemispherical valve seat by setting adjustment pads, tightening bolts, clamping bolts and pressure plates, so as to prevent the hemispherical valve core from exerting pressure on the hemispherical valve seat when the hemispherical valve core moves, avoid the displacement of the hemispherical valve seat, and ensure the sealing performance of the valve. In addition, the ball support of the hemispherical valve is fixed on the valve cover, and the valve cover is directly fixed on the valve body by a bolt structure. When maintenance and replacement are required, the ball support can be directly removed from the valve body for replacement, avoiding the problem that the traditional hemispherical valve needs to remove the valve body from the pipeline. However, the hemispherical valve only realizes the maintenance and replacement method without going offline. During the maintenance and replacement process, the water supply to the pipeline still needs to be stopped before subsequent maintenance and replacement work can be carried out. In actual applications, it is found that some pipeline structures are special and require long-term uninterrupted supply. If the valve is damaged, it must be able to be repaired without stopping the water supply, but there is currently no such structure that can meet this requirement. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a hemispherical valve and a maintenance method that can be maintained without shutting off the water.

[0005] The technical solution of the present invention is: a hemispherical valve capable of maintenance without shutting off water, comprising:

[0006] The valve body is a hollow spherical structure, with a water inlet and a water outlet at both ends of the valve body along the water flow direction, and an inspection port at one end perpendicular to the water flow direction;

[0007] A hemispherical body, wherein the hemispherical body is rotatably hingedly connected to the valve body via a driving shaft arranged along a direction perpendicular to the water flow;

[0008] A valve cover, wherein the valve cover is fixed to the inspection port by a bolt structure;

[0009] A main valve seat, which is arranged at the water outlet and is sealed and connected with the hemisphere when the hemisphere rotates to the water outlet to close the valve;

[0010] An inspection valve seat is arranged at the inspection port and located on the inner side of the valve cover, and an adjustment structure is arranged between the inspection valve seat and the valve seat; the adjustment structure is used to adjust the position of the inspection valve seat so that the inspection valve seat is sealed with the valve body and the valve cover in a non-inspection state, and is sealed with the valve body and the hemisphere rotated to the inspection port in an inspection state.

[0011] Further, the inspection valve seat includes:

[0012] A side plate, wherein the side plate is an annular structure fixed to the valve body by a bolt structure;

[0013] The vertical plate is an annular structure arranged along the direction perpendicular to the water flow. One end of the vertical plate is fixed to the side plate. The vertical plate is sealed and connected to the valve body and the valve cover.

[0014] Further said regulating structure comprises,

[0015] A plurality of connecting screws, which are arranged at intervals along the circumferential direction of the side plate, and are penetrated through the side plate and the valve body along the direction perpendicular to the water flow, so as to connect the side plate to the valve body movably along the direction perpendicular to the water flow;

[0016] A plurality of set screws are arranged at intervals along the circumferential direction of the side plate, the set screws are penetrated through the side plate along a direction perpendicular to the water flow, and the ends of the set screws are pressed against the valve body to adjust the distance between the side plate and the valve body.

[0017] Furthermore, a first sealing groove is formed on the side of the vertical plate facing the valve body; a first annular sealing strip is installed in the first sealing groove; the first sealing strip is located between the vertical plate and the valve body to seal the vertical plate and the valve body.

[0018] Furthermore, the valve cover is provided with a circle of annular bosses protruding along the direction perpendicular to the water flow on the side facing the inspection valve seat; a second sealing groove is provided on the side of the annular boss facing the vertical plate; a second annular sealing strip is installed in the second sealing groove; the second sealing strip is located between the annular boss and the vertical plate to seal the vertical plate and the annular boss.

[0019] Furthermore, the vertical plate is provided with an inclined first end face at one end close to the drive shaft; the hemisphere is provided with an inclined second end face corresponding to the first end face at one end away from the drive shaft; the first end face is tightly fitted with the second end face on the hemisphere flipped to the inspection port during maintenance.

[0020] Furthermore, the valve cover is provided with operating holes at positions corresponding to the connecting screws and the set screws.

[0021] Furthermore, a pressure relief valve is arranged on the valve cover.

[0022] A method for repairing a hemispherical valve that can be repaired without shutting off water is performed according to the following steps:

[0023] 1) Rotate the hemisphere to the inspection port to open the valve;

[0024] 2) Adjust the inspection valve seat so that the inspection valve seat presses the hemisphere to form a sealed connection with the hemisphere;

[0025] 3) Release the pressure in the space between the valve cover and the inspection valve seat, and open the valve cover to expose the hemisphere;

[0026] 4) Repair the sealing structure on the hemisphere.

[0027] Further, in step 2), the method for adjusting the inspection valve seat so that the inspection valve seat presses the hemisphere to form a seal with the hemisphere includes: rotating the connecting screws and the set screws on the inspection valve seat so that the inspection valve seat approaches one side of the hemisphere along the direction perpendicular to the water flow until the first end face on the vertical plate of the inspection valve seat is tightly attached to the second end face of the hemisphere to form a bevel seal.

[0028] The advantages of the present invention are as follows: 1. The present invention uses an adjustable position inspection valve seat, which is sealed and connected to the valve cover in a non-inspection state, to facilitate the rotation of the hemisphere without affecting the overall operation of the valve. During inspection, the hemisphere is moved and sealed to the inspection port, and the valve cover can be opened without stopping the water flow, and the column sealing structure on the hemisphere can be repaired and replaced. For pipelines with special requirements, the valve of the present invention can repair and replace the main sealing structure on the hemisphere without stopping the operation of the pipeline, and the maintenance method is simple and efficient, which has great promotion value;

[0029] 2. The inspection valve seat of the present invention comprises a side plate and a vertical plate. The side plate is used to fix the inspection valve seat on the valve body, and the vertical plate is used to install the sealing connection structure. The overall structure is simple and easy to install, and it is convenient to adjust the inspection valve seat vertically to the water flow direction;

[0030] 3. The adjustment structure of the present invention is extremely simple. By using the connecting screws and the set screws together, the gap between the side plate and the valve body can be adjusted to change the position of the inspection valve seat along the vertical water flow direction, and the sealing connection of the valve cover or the sealing connection of the hemisphere can be switched;

[0031] 4. The present invention seals between the vertical plate and the valve body through the first sealing strip, and the first sealing strip does not affect the movement of the vertical plate in the direction perpendicular to the water flow. That is to say, no matter how the vertical plate moves in the direction perpendicular to the water flow, the first sealing strip can ensure the sealing of the two, with a simple structure and easy installation.

[0032] 5. The present invention seals between the vertical plate and the valve cover through the second sealing strip. The second sealing strip does not affect the movement of the vertical plate in the direction of the water flow perpendicular to the weir, ensuring that the vertical plate can always maintain sealing with the valve cover during the movement of the vertical plate in the direction of the water flow perpendicular to the weir. The structure is simple and the installation is convenient.

[0033] 6. The present invention forms an inclined sealing structure during maintenance by cooperating the first inclined surface at the end of the vertical plate with the second inclined surface at the end of the hemispherical body, which facilitates the subsequent maintenance and replacement of the main sealing structure on the hemispherical body;

[0034] 7. The present invention provides an operating hole on the valve cover to facilitate operation of the connecting screws and set screws corresponding to the operating hole;

[0035] 8. The present invention installs a pressure relief valve on the valve cover, which is convenient for relieving pressure in the space between the valve cover and the hemisphere during maintenance, making the operation safer;

[0036] 9. The maintenance method of the present invention is extremely simple. By adjusting the position of the maintenance valve seat, the maintenance valve seat is sealed and connected to the hemisphere. The main sealing structure on the hemisphere can be repaired and replaced without stopping the water supply of the valve as a whole, which has great promotion value.

[0037] 10. The sealing connection between the inspection valve seat and the hemispherical body of the present invention is extremely simple. The sealing connection between the two can be achieved through the inclined sealing of the first end face and the second end face, and the adjustment method is convenient.

[0038] The invention has a simple structure and is extremely convenient for valve maintenance. The main sealing structure on the valve hemisphere can be repaired and replaced without stopping water supply. The invention is suitable for pipelines with various requirements and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 : Schematic diagram of the closing structure of the hemispherical valve of the present invention (front view direction);

[0040] Figure 2 : Schematic diagram of the closing structure of the hemispherical valve of the present invention (side view);

[0041] Figure 3 :The present invention Figure 1 A part of the enlarged schematic diagram;

[0042] Figure 4 :The present invention Figure 1 A magnified schematic diagram of part B in FIG.

[0043] Figure 5 : Schematic diagram of the valve opening of the hemispherical body and the inspection valve seat of the present invention in the non-inspection state;

[0044] Figure 6 : Schematic diagram of the structure of the valve cover in the open maintenance state of the present invention;

[0045] Among them: 1-valve body; 2-hemispherical body; 2.1-second end face; 2.2-main sealing ring; 2.3-main sealing pressure plate;

[0046] 3—valve cover; 3.1—annular boss; 3.2—second sealing groove; 3.3—second sealing strip; 3.4—operating hole; 3.5—pressure relief valve;

[0047] 4—inspection valve seat; 4.1—side plate; 4.2—vertical plate; 4.3—connecting screws; 4.4—setting screws; 4.5—first sealing groove; 4.6—first sealing strip; 4.7—first end face;

[0048] 5—main valve seat; 6—drive shaft. DETAILED DESCRIPTION

[0049] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0050] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] like Figures 1 to 6 As shown, this embodiment relates to a hemispherical valve that can be repaired without shutting off the water supply. The hemispherical valve of this embodiment can repair and replace the main sealing structure in the hemispherical valve without shutting off the water supply. Specifically, the hemispherical valve of this embodiment includes a valve body 1, a hemispherical body 2, a valve cover 3, a repair valve seat 4 and a main valve seat 5.

[0054] The structure of valve body 1 is as follows Figures 1-2 As shown, the valve body 1 is a hollow spherical structure, with a water inlet and a water outlet at both ends of the valve body 1 along the water flow direction, and an inspection port at one end perpendicular to the water flow direction. Figure 1 The water flow direction shown in the figure is the horizontal direction. In actual application, this direction may not be limited and may also be vertical. This embodiment takes the horizontal direction as an example. Figures 1-2 As shown, the inspection opening is the upper end in the vertical direction.

[0055] The valve cover 3 is installed on the valve body 1. A plurality of screw holes are provided on the valve cover 3, and the valve cover 3 is fixed to the valve body 1 by installing screws. In addition, in order to facilitate the subsequent opening of the valve cover 3, a pin is provided in the screw hole of the valve cover 3 in this embodiment. The pin can be used to separate the valve cover 3 from the sealing surface of the valve body 1, thereby facilitating the opening of the valve cover 3.

[0056] One end of the hemisphere 2 is rotatably hingedly connected to the valve body 1 through a drive shaft 6 arranged in a perpendicular direction of the water flow, and the other end of the hemisphere 2 is provided with a main sealing structure, and the other end of the hemisphere 2 is provided with a main sealing ring 2.2 and a main sealing pressure plate 2.3. The other end of the hemisphere 2 is provided with a ring-shaped groove, and the main sealing ring 2.2 is fastened in the groove through the main sealing pressure plate 2.3. Part of the main sealing ring 2.2 protrudes from the surface of the main sealing pressure plate 2.3. When the hemisphere 2 rotates to the side of the water outlet, the protruding part is sealed and connected with the main valve seat 5 to close the valve.

[0057] like Figure 1 As shown, the main valve seat 5 is arranged at the water outlet. The main valve seat 5 is an annular structure. The main valve seat 5 is fixed to the water outlet side of the valve body 1 by a bolt structure. A sealing ring is arranged between the main valve seat 5 and the valve body 1.

[0058] The inspection valve seat 4 of this embodiment is arranged at the inspection port and is located inside the valve cover 3. Figure 3 and 5 As shown, the inspection valve seat 4 includes a side plate 4.1 and a vertical plate 4.2. The side plate 4.1 is an annular structure fixed to the valve body 1 by a bolt structure, and the vertical plate 4.2 is an annular structure arranged along the vertical water flow direction. One end of the vertical plate 4.2 is fixed to the side plate 4.1, and the vertical plate 4.2 is sealed to the valve body 1 and the valve cover 3. The vertical plate 4.2 needs to achieve sealing in three positions. One is the sealing between the vertical plate 4.2 and the valve body 1, and the second is the sealing between the vertical plate 4.2 and the valve cover 3. The above two seals are always maintained during the vertical movement of the inspection valve seat 4. The third is the sealing between the vertical plate 4.2 and the hemisphere 2 during maintenance. Specifically, as Figure 3 and 5 As shown, a first sealing groove 4.5 is provided on the side of the vertical plate 4.2 facing the valve body 1, and an annular first sealing strip 4.6 is installed in the first sealing groove 4.5. The first sealing strip 4.6 is located between the vertical plate 4.2 and the valve body 1 to seal the vertical plate 4.2 and the valve body 1. A circle of annular bosses 3.1 protruding along the vertical water flow direction is provided on the side of the valve cover 3 facing the inspection valve seat 4. A second sealing groove 3.2 is provided on the side of the annular boss 3.1 facing the vertical plate 4.2, and an annular second sealing strip 3.3 is installed in the second sealing groove 3.2. The second sealing strip 3.3 is located between the annular boss 3.1 and the vertical plate 4.2 to seal the vertical plate 4.2 and the annular boss 3.1.

[0059] As for the sealing between the vertical plate 4.2 and the hemispherical body 2, Figures 3 to 5 As shown, an inclined first end face 4.7 is provided at one end of the vertical plate 4.2 close to the drive shaft 6, and an inclined second end face 2.1 corresponding to the first end face 4.7 is provided at one end of the hemispherical body 2 away from the drive shaft 6. The first end face 4.7 fits tightly with the second end face 2.1 on the hemispherical body 2 flipped to the inspection port during maintenance.

[0060] In order to adjust the position of the inspection valve seat 4 in the direction perpendicular to the water flow, an adjustment structure is provided between the inspection valve seat 4 and the valve body 1. Figure 3 and 5As shown, the adjustment structure includes a plurality of connecting screws 4.3 and a plurality of set screws 4.4. The plurality of connecting screws 4.3 are arranged at intervals along the circumferential direction of the side plate. The connecting screws 4.3 are penetrated through the side plate 4.1 and the valve body 1 in a direction perpendicular to the water flow, so that the side plate 4.1 can be connected to the valve body 1 movably in the direction perpendicular to the water flow. The plurality of set screws 4.4 are arranged at intervals along the circumferential direction of the side plate 4.1. The set screws 4.4 are penetrated through the side plate 4.1 in a direction perpendicular to the water flow, and the ends of the set screws 4.4 are pressed against the valve body 1 to adjust the spacing between the side plate 4.1 and the valve body 1. The connecting screws 4.3 and the set screws 4.4 are arranged in an alternating manner. The side plate 4.1 can move in the direction perpendicular to the water flow under the action of the connecting screws 4.3 and the set screws 4.4. During the movement, the sealing connection between the vertical plate and the valve body 1 and the valve cover 3 does not change, and the sealing is always maintained.

[0061] When the inclined seal is formed between the vertical plate 4.2 and the hemispherical body 2, the valve cover 3 can be opened to expose the main sealing structure on the hemispherical body 2 for maintenance and replacement. In order to facilitate operation, the valve cover 3 of this embodiment is provided with an operation hole 3.4 at the position corresponding to the connecting screw 4.3 and the set screw 4.4, so as to facilitate the screwing operation of the connecting screw 4.3 and the set screw 4.4. The valve cover 3 of this embodiment is provided with a pressure relief valve 3.5, so as to facilitate the pressure relief operation of the space between the valve cover 3 and the hemispherical body 2.

[0062] The specific maintenance work is carried out according to the following steps:

[0063] 1. Switch the valve to the open state, that is, rotate the hemispherical body 2 to the inspection port;

[0064] 2. Loosen the set screw 4.4 between the inspection valve seat 4 and the valve body 1;

[0065] 3. Tighten the connecting screws 4.3 between the inspection valve seat 4 and the valve body 1, so that the inspection valve seat 4 presses the hemispherical body 2, that is, the first end face 4.7 presses on the second end face 2.1, and a sealed connection is formed between the inspection valve seat 4 and the hemispherical body 2;

[0066] 4. Open the pressure relief valve 3.5 on the top of the valve cover 3 to release the pressure, and check whether a seal is formed between the inspection valve seat 4 and the hemispherical body 2. If an effective seal is formed, after the pressure relief valve 3.5 is opened, some water will flow out and no more water will flow out, and after the pressure relief valve 3.5 is closed, the pressure gauge pressure will not rise; if water continues to flow out, continue to tighten the connecting screws 4.3 between the inspection valve seat 4 and the valve body 1 until the seal is effective;

[0067] 5. Remove all bolts between the valve cover 3 and the valve body 1;

[0068] 6. Turn the pin (in conjunction with the bolt on the valve cover 3, screw it into the threaded hole) to lift the valve cover 3 and disengage the seal between the valve cover 3 and the inspection valve seat 4;

[0069] 7. Turn the valve cover 3 to the side of the valve to expose the hemispherical body 2. Figure 6 As shown;

[0070] 8. Loosen the screws on the main sealing plate 2.3, and use the set screws on the main sealing plate 2.3 to push out the main sealing plate 2.3;

[0071] 9. Remove and replace the main sealing ring 2.2;

[0072] 10. Then restore the valve in reverse order to complete the online maintenance of the valve without shutting off the water.

[0073] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hemispherical valve that can be repaired without shutting off the water, characterized in that: include, A valve body (1), wherein the valve body (1) is a hollow spherical structure, and the valve body (1) is provided with a water inlet and a water outlet at two ends along the water flow direction, and an inspection port at one end perpendicular to the water flow direction; A hemispherical body (2), wherein the hemispherical body (2) is rotatably hingedly connected to the valve body (1) via a driving shaft (6) arranged perpendicular to the water flow direction; A valve cover (3), wherein the valve cover (3) is fixed to the inspection port by a bolt structure; A main valve seat (5), wherein the main valve seat (5) is arranged at the water outlet and is sealedly connected with the hemisphere (2) to close the valve when the hemisphere (2) rotates to the water outlet; An inspection valve seat (4), the inspection valve seat (4) being arranged at the inspection port and located inside the valve cover (3), and an adjustment structure being arranged between the inspection valve seat (4) and the valve seat (1); the adjustment structure being used to adjust the position of the inspection valve seat (4) so ​​that the inspection valve seat (4) is sealedly connected to the valve body (1) and the valve cover (3) in a non-inspection state, and is sealedly connected to the valve body (1) and the hemisphere (2) rotated to the inspection port in an inspection state; The inspection valve seat (4) comprises: A side plate (4.1), wherein the side plate (4.1) is an annular structure fixed to the valve body (1) by a bolt structure; A vertical plate (4.2), wherein the vertical plate (4.2) is an annular structure arranged in a direction perpendicular to the water flow, one end of the vertical plate (4.2) is fixed to the side plate (4.1), and the vertical plate (4.2) is sealedly connected to the valve body (1) and the valve cover (3); The regulating structure comprises: A plurality of connecting screws (4.3), the plurality of connecting screws (4.3) being arranged at intervals along the circumferential direction of the side plate, the connecting screws (4.3) being passed through the side plate (4.1) and the valve body (1) in a direction perpendicular to the water flow, and connecting the side plate (4.1) to the valve body (1) so as to be movable in the direction perpendicular to the water flow; A plurality of set screws (4.4) are arranged at intervals along the circumferential direction of the side plate (4.1), the set screws (4.4) are passed through the side plate (4.1) in a direction perpendicular to the water flow, and the ends of the set screws (4.4) are pressed against the valve body (1) to adjust the distance between the side plate (4.1) and the valve body (1).

2. A hemispherical valve capable of maintenance without shutting off water as claimed in claim 1, characterized in that: A first sealing groove (4.5) is provided on the side of the vertical plate (4.2) facing the valve body (1); a first annular sealing strip (4.6) is installed in the first sealing groove (4.5); the first sealing strip (4.6) is located between the vertical plate (4.2) and the valve body (1) to seal the vertical plate (4.2) and the valve body (1).

3. A hemispherical valve capable of maintenance without shutting off water as claimed in claim 1, characterized in that: A circle of annular bosses (3.1) protruding in a direction perpendicular to the water flow is arranged on the side of the valve cover (3) facing the inspection valve seat (4); a second sealing groove (3.2) is provided on the side of the annular boss (3.1) facing the vertical plate (4.2); an annular second sealing strip (3.3) is installed in the second sealing groove (3.2); the second sealing strip (3.3) is located between the annular boss (3.1) and the vertical plate (4.2) to seal the vertical plate (4.2) and the annular boss (3.1).

4. A hemispherical valve capable of maintenance without shutting off water as claimed in claim 1, characterized in that: An inclined first end face (4.7) is provided at one end of the vertical plate (4.2) close to the drive shaft (6); an inclined second end face (2.1) corresponding to the first end face (4.7) is provided at one end of the hemispherical body (2) away from the drive shaft (6); and the first end face (4.7) is tightly fitted with the second end face (2.1) on the hemispherical body (2) flipped over to the inspection port during maintenance.

5. A hemispherical valve capable of maintenance without shutting off water as claimed in claim 1, characterized in that: The valve cover (3) is provided with an operating hole (3.4) at a position corresponding to the connecting screw (4.3) and the set screw (4.4).

6. A hemispherical valve capable of maintenance without shutting off water as claimed in claim 1, characterized in that: The valve cover (3) is provided with a pressure relief valve (3.5).

7. A method for repairing a hemispherical valve that can be repaired without shutting off water as claimed in claim 1, characterized in that: Follow these steps: 1) Rotate the hemisphere (2) to the inspection port to open the valve; 2) adjusting the inspection valve seat (3) so that the inspection valve seat (3) presses against the hemisphere (2) to form a sealed connection with the hemisphere (2); 3) Depressurize the space between the valve cover (3) and the inspection valve seat (4), and open the valve cover (3) to expose the hemispherical body (2); 4) Repair the sealing structure on the hemispherical body (2); The method for adjusting the inspection valve seat (4) in step 2) so that the inspection valve seat (4) presses the hemisphere (2) to form a seal with the hemisphere (2) comprises: rotating the connecting screw (4.3) and the fixing screw (4.4) on the inspection valve seat (4) so ​​that the inspection valve seat (4) approaches one side of the hemisphere (2) along the direction perpendicular to the water flow until the first end surface (4.7) on the vertical plate (4.2) of the inspection valve seat (4) is tightly attached to the second end surface (2.1) of the hemisphere (2) to form an inclined seal.

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