Full-bore metal sealing rotary ball valve for water supply and drainage

Abstract

The invention relates to the technical field of rotary ball valves, and discloses a full-bore metal sealing rotary ball valve for water supply and drainage, which comprises a communicating unit, a blocking unit and a pivoting unit, a stuffing box is arranged on a valve body of the communicating unit, and the central axis of the stuffing box is perpendicular to but not intersected with the central axis of a valve body runner, so that a double-eccentric structure is formed. A valve seat of the blocking unit is arranged in a valve seat cavity in a floating mode, and sealing faces of the valve seat and a valve plate are metal hard face sealing ring belts. Through cooperative cooperation of the double-eccentric structure and the floating type metal hard face valve seat, friction is avoided in the opening and closing process, the self-compensation sealing function after the valve seat is abraded is achieved, and the service life is effectively prolonged; and meanwhile, the gradual movement of the valve plate during closing has the scraping and sweeping self-cleaning capacity, and reliable sealing under the working condition of containing solid particles is ensured. The valve is compact in structure, the valve seat is convenient to replace, and reliable two-way sealing can be achieved.

Description

Technical Field

[0001] This invention relates to the technical field of rotary ball valves, and more particularly to a full-bore metal-sealed rotary ball valve for water supply and drainage. Background Technology

[0002] A rotary ball valve is an angular stroke valve whose valve plate rotates around a fixed axis to connect or disconnect the medium in a pipeline. Due to its combination of the tight sealing performance of a ball valve, the compact structure of a butterfly valve, and the low flow resistance of a gate valve, rotary ball valves are widely used in various fields such as water conservancy, power, municipal water supply and drainage, and chemical industry. Compared to traditional gate valves or butterfly valves, the rotary ball valve allows the valve plate to quickly disengage from the valve seat sealing surface during opening and closing, effectively reducing friction and wear, thus offering significant advantages such as low operating torque and long service life.

[0003] Traditional soft-seal rotary ball valves are prone to scratching, wear, or aging of their soft seats (such as rubber or PTFE) when exposed to media containing solid particles or silt, or under high-temperature conditions. This leads to decreased sealing performance and significantly limits their application scenarios. For some metal-seal rotary ball valves, once the valve seat sealing surface wears down, the entire valve often needs to be removed from the pipeline for repair or replacement at the factory. This maintenance process is complex, time-consuming, and costly, failing to meet the high reliability and ease of maintenance requirements of modern industry. Therefore, how to provide a metal-seal rotary ball valve that can adapt to various harsh operating conditions and allows for quick and convenient maintenance after valve seat wear is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the current full-bore metal-sealed rotary ball valve for water supply and drainage, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a full-bore metal-sealed rotary ball valve for water supply and drainage, which is to provide a metal-sealed rotary ball valve that can adapt to a variety of harsh working conditions and can be quickly and conveniently maintained after the valve seat is worn.

[0007] To solve the above technical problems, the present application provides the following technical solutions: a full-bore metal sealing rotary ball valve for water supply and drainage, comprising a communication unit, the communication unit comprises a valve body, the valve body is provided with a mounting groove at the water inlet end, the bottom of the mounting groove is coaxially provided with a valve seat cavity, the valve body is provided with a stuffing box, the central axis of the stuffing box is vertically spaced from the central axis of the flow passage of the valve body but does not intersect; a blocking unit, the blocking unit comprises a pressure plate fixedly installed on the mounting groove, a valve seat is floatingly arranged in the valve seat cavity, a valve plate is pivotally arranged in the communication unit and cooperates with the valve seat to realize blocking, and a connecting support is arranged on the non-sealing surface of the valve plate; a pivoting unit, the pivoting unit comprises a valve shaft penetrating the stuffing box, and the connecting support is coupled with the valve shaft to realize the pivoting movement of the valve plate.

[0008] As a preferred scheme of the full-bore metal sealing rotary ball valve for water supply and drainage, the bottom surface of the mounting groove is provided with a threaded hole, and the top of the stuffing box is provided with a connecting flange.

[0009] As a preferred scheme of the full-bore metal sealing rotary ball valve for water supply and drainage, the stuffing box comprises an upper stuffing box and a lower stuffing box, and the connecting flange at the top of the lower stuffing box is sealingly installed with a gasket.

[0010] As a preferred scheme of the full-bore metal sealing rotary ball valve for water supply and drainage, the pressure plate is provided with a countersunk hole corresponding to the threaded hole, the threaded hole and the countersunk hole are penetrated by a countersunk bolt, and the pressure plate is fixedly installed on the mounting groove through the countersunk bolt.

[0011] As a preferred scheme of the full-bore metal sealing rotary ball valve for water supply and drainage, the valve seat comprises a limiting ring part and a sealing main part; the surface of the limiting ring part corresponding to the pressure plate and the surface corresponding to the inner wall of the valve seat cavity are provided with an annular groove, and the annular groove is provided with a first elastic sealing ring; a step surface is formed at the connection between the limiting ring part and the sealing main part, and the step surface is provided with a second elastic sealing ring; the curved surface of the sealing main part in contact with the valve plate is a sealing surface, and a rounded corner transition is formed at the contact position of the sealing surface and the valve plate.

[0012] As a preferred scheme of the full-bore metal sealing rotary ball valve for water supply and drainage, the surface of the valve plate in contact with the sealing surface is a valve plate sealing surface.

[0013] As a preferred scheme of the full-bore metal seal rotary ball valve for water supply and drainage, the sealing surface and the valve plate sealing surface are metal hard surface sealing rings.

[0014] As a preferred scheme of the full-bore metal seal rotary ball valve for water supply and drainage, the connecting support is provided with an upper shaft seat and a lower shaft seat, the upper shaft seat is provided with a mounting hole, and the lower shaft seat is provided with a bearing.

[0015] As a preferred scheme of the full-bore metal seal rotary ball valve for water supply and drainage, the valve shaft is integrally formed with a shaft shoulder, and the shaft shoulder is in contact with the end surface of the shaft seat to form an axial seal.

[0016] As a preferred scheme of the full-bore metal seal rotary ball valve for water supply and drainage, the valve shaft comprises a transmission valve shaft and a pivot valve shaft. The transmission valve shaft penetrates the upper packing gland, the transmission valve shaft is provided with a through hole corresponding to the mounting hole, and the transmission valve shaft is fixedly connected with the upper shaft seat through a fixing bolt penetrating the mounting hole and the through hole. One end of the pivot valve shaft is accommodated in the lower packing gland, and the other end of the pivot valve shaft is rotatably connected with the lower shaft seat through the bearing.

[0017] The center axis of the packing gland and the center axis of the valve body flow passage form a double-eccentric structure, so that the valve plate can quickly separate from the valve seat sealing surface during opening, and there is almost no friction and wear during the entire opening and closing process, thereby significantly reducing the operation torque and greatly prolonging the service life of the entire valve. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them: Figure 1 It is a whole structure schematic diagram of the full-bore metal seal rotary ball valve for water supply and drainage.

[0019] Figure 2 The opening state structure diagram of the full-bore metal sealing rotary ball valve for water supply and drainage.

[0020] Figure 3 The explosion diagram of the full-bore metal sealing rotary ball valve for water supply and drainage.

[0021] Figure 4 The sectional view of the full-bore metal sealing rotary ball valve for water supply and drainage.

[0022] Figure 5 The valve seat part detail diagram of the full-bore metal sealing rotary ball valve for water supply and drainage.

[0023] Figure 6 The axis position relationship diagram of the packing box 104 and the valve body 101 flow channel.

[0024] Legend: 101 valve body, 102 mounting groove, 103 valve seat cavity, 104 packing box, 104a upper packing box, 104b lower packing box, 105 threaded hole, 106 connecting flange, 107 gasket, 201 pressure plate, 202 valve seat, 203 valve plate, 204 connecting support, 205 countersunk hole, 206 countersunk bolt, 207 limit ring part, 208 sealing main body part, 209 annular groove, 210a first elastic sealing ring, 210b second elastic sealing ring, 211 step surface, 212 sealing surface, 213 valve plate sealing surface, 214a upper shaft seat, 214b lower shaft seat, 215 mounting hole, 216 bearing, 301 valve shaft, 302 shaft shoulder, 303 through hole, 304 fixing bolt. DETAILED DESCRIPTION

[0025] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0026] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the concept of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0027] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an independent or selective embodiment mutually exclusive with other embodiments.

[0028] Thirdly, the present application is described in detail in combination with the schematic diagram. In the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is locally enlarged without the general proportion for the convenience of illustration, and the schematic diagram is only an example which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture. Embodiment 1

[0029] Reference Figures 1-6 For the first embodiment of the present application, a full-bore metal sealing rotary ball valve for water supply and drainage is provided. The full-bore metal sealing rotary ball valve for water supply and drainage includes a communication unit 100, the communication unit 100 includes a valve body 101, the valve body 101 is provided with a mounting groove 102 at the water inlet end, the bottom of the mounting groove 102 is coaxially provided with a valve seat cavity 103, the valve body 101 is provided with a stuffing box 104, the center axis L of the stuffing box 104 is spatially perpendicular to but not intersected with the center axis M of the flow passage of the valve body 101. A blocking unit 200, the blocking unit 200 includes a pressure plate 201 fixedly installed in the mounting groove 102, a valve seat 202 is floatingly arranged in the valve seat cavity 103, a valve plate 203 is pivotally arranged in the communication unit 100 and cooperates with the valve seat 202 to realize blocking, and a connecting bracket 204 is arranged on the non-sealing surface of the valve plate 203. A pivoting unit 300, the pivoting unit 300 includes a valve shaft 301 penetrating the stuffing box 104, and the connecting bracket 204 is coupled with the valve shaft 301 to realize the pivoting movement of the valve plate 203.

[0030] During installation, the valve shaft 301 first penetrates the stuffing box 104, is then coupled with the connecting bracket 204, and then the valve plate 203 is adjusted to the closed state of the valve by rotating the valve shaft 301. The valve seat 202 is placed in the valve seat cavity 103, and the pressure plate 201 is fixedly installed in the mounting groove 102. The pressure plate 201 and the step of the valve seat cavity 103 jointly define a limiting space, the valve seat 202 is accommodated in the limiting space and can axially and radially float within the limited stroke, so as to better adapt to the contact surface with the valve plate 203 and realize a highly reliable sealing effect. After the above installation is completed, the valve body 101 is connected to the external pipeline. Then, a predetermined amount of packing is loaded in the stuffing box 104, and a pre-tightening force is applied by the packing gland to realize the sealing of the valve shaft 301. Finally, the driving device is connected to the valve shaft 301, and several full-stroke opening and closing operations are performed to ensure smooth operation and reliable sealing of each component, so that the valve can be put into use.

[0031] The maintenance process is as follows: firstly, the valve is removed from the pipeline, and the end of the pressure disc 201 is placed upward, and then the fixed bolts on the pressure disc 201 are removed, so that the pressure disc 201 and the valve seat 202 are taken out; the packing gland at the top of the packing box 104 is removed, so that the valve shaft 301 is taken out of the packing box 104, and the valve plate 203 is taken out of the valve body 101. After all the parts are disassembled, cleaning and inspection can be carried out, and the worn sealing elements (such as the valve seat 202 and the valve plate 203) can be quickly replaced. After the replacement is completed, the assembly steps are performed, and the entire maintenance work is completed. The entire process does not require special tools, and the maintenance efficiency of the valve is greatly improved.

[0032] During the opening process of the valve, the valve shaft 301 is driven to rotate and open by an external driving device, and the valve shaft 301 transmits the torque to the valve plate 203 through the connecting bracket 204. Since the pivot axis L of the valve shaft 301 is eccentrically arranged with the center axis M of the flow passage of the valve body 101, at the initial angle of rotation of the valve plate 203, the contact surface thereof can quickly and completely separate from the valve seat 202, thereby avoiding extrusion and friction between the two in the subsequent opening process. When the valve plate 203 is rotated to a position parallel to the flow passage, the valve is completely opened.

[0033] During the closing process of the valve, the valve shaft 301 is driven to rotate and close by an external driving device, and the valve plate 203 maintains a non-contact state with the valve seat 202 at most angles. At the angle close to complete closing, the contact surface of the valve plate 203 approaches the valve seat 202 in a gradual manner. During this process, the edge of the valve plate 203 effectively scrapes the contact surface of the valve seat 202, which can remove scale, impurities or solid particles attached to the surface of the valve seat 202, thereby realizing a self-cleaning function. In the final closing process, the valve plate 203 applies a wedging force to the valve seat 202. At this time, the floating valve seat 202 can be self-adaptively adjusted under the joint action of the pipeline medium pressure and the wedging force, so as to seek the best fitting position of the contact surface of the valve plate 203 which has just been cleaned, thereby forming a tight and reliable cutting seal. Example 2

[0034] Reference Figures 1-5 For the second embodiment of the present application, the difference between the second embodiment and the first embodiment is that the bottom surface of the installation groove 102 is provided with a threaded hole 105, and the top of the packing box 104 is provided with a connecting flange 106. The packing box 104 includes an upper packing box 104a and a lower packing box 104b, and the connecting flange 106 at the top of the lower packing box 104b is sealingly installed with a gasket 107.

[0035] The threaded hole 105 can well play a role in fixing the pressure disc 201, the upper packing gland 104a can be connected with the external driving device through the connecting flange 106 at the top thereof after completing packing, and the valve shaft 301 penetrating through the threaded hole 105 can realize dynamic sealing with the packing.

[0036] The rest of the structure is the same as that of example 1. Example 3

[0037] With reference to Figures 1-5 For the third embodiment of the application, which is different from the second embodiment, the threaded hole 105 and the countersunk hole 205 penetrating through the threaded hole 105 are provided with a countersunk bolt 206, and the pressure disc 201 is fixedly installed on the installation groove 102 through the countersunk bolt 206.

[0038] The valve seat 202 comprises a limiting ring part 207 and a sealing main part 208; the face of the limiting ring part 207 corresponding to the pressure disc 201 and the face corresponding to the inner circumferential wall of the valve seat cavity 103 are provided with an annular groove 209, and the annular groove 209 is provided with a first elastic sealing ring 210a; a stepped surface 211 is formed at the connection between the limiting ring part 207 and the sealing main part 208, and the stepped surface 211 is provided with a second elastic sealing ring 210b; the curved surface of the sealing main part 208 in contact with the valve plate 203 is a sealing surface 212, and the contact part of the sealing surface 212 and the valve plate 203 forms a fillet transition.

[0039] The face of the valve plate 203 in contact with the sealing surface 212 is a valve plate sealing surface 213. The sealing surface 212 and the valve plate sealing surface 213 are both metal hard surface sealing rings. The connecting bracket 204 is provided with an upper shaft seat 214a and a lower shaft seat 214b, the upper shaft seat 214a is provided with an installation hole 215, and the lower shaft seat 214b is provided with a bearing 216.

[0040] The countersunk hole 205 and the threaded hole 105 correspond to each other, the countersunk bolt 206 penetrates through the countersunk hole 205, is threadedly fastened with the threaded hole 105, and fixes the pressure disc 201 in the installation groove 102; the design of the countersunk hole 205 makes the head of the countersunk bolt 206 completely sink below the surface of the pressure disc 201, which not only ensures the smoothness of the internal flow passage of the valve and reduces the fluid resistance, but also avoids the obstruction of the bolt head to the solid particles in the fluid, and reduces the erosion and wear of the bolt head by the solid particles. The countersunk structure is adopted because it increases the penetration path of the fluid medium along the small gap between the bolt shaft and the hole wall, effectively slows down the erosion of the liquid medium to the bolt shaft, and improves the durability of the connection.

[0041] The limiting ring part 207, through the first elastic sealing ring 210a arranged on the surface corresponding to the pressure disc 201 and the inner wall of the valve seat cavity 103, and the second elastic sealing ring 210b arranged on the step surface 211 connecting with the sealing body part 208, jointly forms a multiple sealing structure between the valve seat 202 and the valve body 101, ensuring that the medium cannot leak from the periphery of the valve seat, and realizing the bidirectional sealing function of the valve.

[0042] The mounting hole 215 can integrally connect the upper shaft seat 214a and the valve shaft 301 through bolts, so that the torque transmitted by the external driving device to the valve shaft 301 can be stably applied to the valve plate 203 through the connecting bracket 204 to drive the valve plate 203 to open and close. The valve only needs one valve shaft 301 as the input power to realize the overall operation; and the other valve shaft 301 realizes the precise axial and radial positioning function through the bearing 216 in the lower shaft seat 214b, thereby providing a rotation reference for the valve plate 203.

[0043] The metal hard surface sealing ring of the sealing surface 212 and the valve plate sealing surface 213 is formed by laying one or more alloy coatings with specific properties on the groove base previously provided on the valve seat 202 and the valve plate 203 through plasma surfacing, spraying or supersonic spraying, and then through precise machining and grinding.

[0044] For example, when hardening stellite hard alloy, very high hardness and wear resistance can be obtained, which is suitable for slurry medium containing solid particles; when cladding monel alloy, excellent seawater and chemical corrosion resistance is obtained; when selecting inconel alloy, high temperature and high pressure harsh environment can be coped with; by spraying tungsten carbide coating, the sealing surface can be endowed with very high hardness like ceramic to resist strong erosion and wear, so as to cope with the use scene of high-speed fluid containing a large number of hard particles, such as the sand discharge hole of a hydropower station or the slurry conveying pipeline.

[0045] Combined with the advantage that the structure of the valve itself is easy to replace, the valve seat 202 and the valve plate 203 can be quickly replaced according to the actual working condition to quickly adapt to the working condition, greatly improving the flexibility and economy of the valve.

[0046] The remaining structure is the same as that of example 2. Example 4

[0047] Reference Figures 1-5 For the fourth embodiment of the application, the difference between this embodiment and the third embodiment is that the shaft shoulder 302 is integrally formed on the valve shaft 301, and the shaft shoulder 302 contacts the end surface of the shaft seat 214 to form an axial seal. The valve shaft 301 includes a transmission valve shaft 301a and a pivoting valve shaft 301b. The transmission valve shaft 301a passes through the upper stuffing box 104a. The transmission valve shaft 301a has a through hole 303 corresponding to the mounting hole 215. The transmission valve shaft 301a is fixedly connected to the upper shaft seat 214a by fixing bolts 304 passing through the mounting hole 215 and the through hole 303. One end of the pivot valve shaft 301b is housed in the lower stuffing box 104b, and the other end of the pivot valve shaft 301b is rotatably connected to the lower shaft seat 214b via the bearing 216.

[0048] During installation, when the valve shaft 301 is inserted into the shaft seat 214, the lower end face of the shoulder 302 abuts against the top end face of the shaft seat 214, providing the valve shaft 301 with precise axial installation and positioning without the need for special tools, ensuring the high consistency of the pivot center. During valve operation, these two tightly fitting end faces provide an axial seal, effectively protecting this installation and positioning structure and preventing it from failing due to long-term erosion.

[0049] The drive valve shaft 301a receives and transmits all operating torque applied by the external drive unit. During installation, it passes through the upper stuffing box 104a and is inserted into the upper shaft seat 214a, with its shoulder 302 abutting against the top end face of the upper shaft seat 214a. At this point, the through hole 303 is precisely aligned with the mounting hole 215 of the upper shaft seat 214a. The fixing bolts 304 pass through these aligned holes, rigidly securing the drive valve shaft 301a to the upper shaft seat 214a. This ensures the rotational accuracy of the valve plate 203 during valve opening and closing.

[0050] One end of the pivot valve shaft 301b is precisely housed within a fully sealed lower stuffing box 104b, serving a radial positioning function; the other end achieves low-friction rotation through a bearing 216 pre-installed within the lower shaft seat 214b. The bearing 216 is located in the lower shaft seat 214b and is enclosed by a pre-formed sealed cavity formed by the shoulder 302 and the top end face of the lower shaft seat 214b, thereby protecting it from direct scouring and erosion by the fluid medium.

[0051] The remaining structure is the same as that in Example 3.

[0052] Combined with appendix Figures 1-6As shown, the connecting unit 100 includes a valve body 101, with an installation groove 102 at the water inlet end of the valve body 101. A valve seat cavity 103 is coaxially provided at the bottom of the installation groove 102. The valve body 101 is provided with a stuffing box 104, and the central axis L of the stuffing box 104 is spatially perpendicular to but does not intersect with the central axis M of the flow channel of the valve body 101. The blocking unit 200 includes a pressure plate 201 fixedly installed on the installation groove 102. A valve seat 202 is floatingly provided in the valve seat cavity 103. A valve plate 203 that cooperates with the valve seat 202 to achieve blocking is pivotally provided in the connecting unit 100. A connecting bracket 204 is provided on the non-sealing surface of the valve plate 203. The pivoting unit 300 includes a valve shaft 301 passing through the stuffing box 104. The connecting bracket 204 is coupled to the valve shaft 301 to realize the pivoting movement of the valve plate 203.

[0053] The bottom surface of the mounting groove 102 has a threaded hole 105, and the top of the stuffing box 104 is provided with a connecting flange 106. The stuffing box 104 includes an upper stuffing box 104a and a lower stuffing box 104b, and the connecting flange 106 on the top of the lower stuffing box 104b is sealed with a gasket 107.

[0054] The pressure plate 201 has a countersunk hole 205 corresponding to the threaded hole 105. Countersunk bolts 206 pass through the threaded hole 105 and the countersunk hole 205. The pressure plate 201 is fixedly installed on the mounting groove 102 by the countersunk bolts 206.

[0055] The valve seat 202 includes a limiting ring portion 207 and a sealing body portion 208. An annular groove 209 is formed on the limiting ring portion 207 on the surface corresponding to the pressure plate 201 and the surface corresponding to the inner peripheral wall of the valve seat cavity 103. A first elastic sealing ring 210a is provided in the annular groove 209. A stepped surface 211 is formed at the connection between the limiting ring portion 207 and the sealing body portion 208. A second elastic sealing ring 210b is provided on the stepped surface 211. The curved surface of the sealing body portion 208 that contacts and seals with the valve plate 203 is the sealing surface 212. A rounded transition is formed at the contact point between the sealing surface 212 and the valve plate 203.

[0056] The valve plate 203 contacts and seals with the sealing surface 212 at the valve plate sealing surface 213. Both the sealing surface 212 and the valve plate sealing surface 213 are metal hard-faced sealing rings. The connecting bracket 204 is provided with an upper shaft seat 214a and a lower shaft seat 214b. The upper shaft seat 214a has a mounting hole 215, and the lower shaft seat 214b has a bearing 216 installed inside.

[0057] A shoulder 302 is integrally formed on the valve shaft 301, and the shoulder 302 contacts the end face of the bearing 214 to form an axial seal. The valve shaft 301 includes a drive valve shaft 301a and a pivot valve shaft 301b; the drive valve shaft 301a passes through the upper stuffing box 104a, and the drive valve shaft 301a has a through hole 303 corresponding to the mounting hole 215. The drive valve shaft 301a is fixedly connected to the upper bearing 214a by fixing bolts 304 passing through the mounting hole 215 and the through hole 303; one end of the pivot valve shaft 301b is housed in the lower stuffing box 104b, and the other end of the pivot valve shaft 301b is rotatably connected to the lower bearing 214b through a bearing 216.

[0058] The installation process involves inserting the transmission valve shaft 301a through the upper stuffing box 104a at the top of the valve body 101 and connecting its lower end to the upper shaft seat 214a of the connecting bracket 204. Simultaneously, the pivot valve shaft 301b is inserted through the lower stuffing box 104b at the bottom of the valve body 101, with its upper end engaging with the bearing 216 inside the lower shaft seat 214b of the connecting bracket 204. After installation, the end face of the shoulder 302 abuts against the end face of the shaft seat 214. This installation process does not require precise axial positioning with special tools. Once installed, the bearing 216 is enclosed by the sealed cavity formed by the shoulder 302 of the pivot valve shaft 301b and the end face of the lower shaft seat 214b, protecting it from direct scouring and erosion by the fluid medium.

[0059] By passing a fixing bolt 304 through the through hole 303 of the transmission valve shaft 301a and the mounting hole 215 of the upper shaft seat 214a, the transmission valve shaft 301a and the upper shaft seat 214a are rigidly fixed together. Then, the valve shaft 301 is rotated to adjust the valve plate 203 to the closed state. The valve seat 202 with a composite sealing structure is placed into the valve seat cavity 103, and the pressure plate 201 is fixed to the mounting groove 102 by countersunk bolts 206. Through the first elastic sealing ring 210a and the second elastic sealing ring 210b, the limiting ring 207 fits tightly with the valve seat cavity 103 and the pressure plate 201, forming a reliable static seal and a bidirectional seal base; the sealing body 208 has its floating characteristics, and the sealing surface 212 initially contacts the valve plate sealing surface 213 of the valve plate 203 in the closed state. Both the sealing surface 212 and the valve plate sealing surface 213 are metal hard-face sealing rings. By replacing the valve seat 202 and valve plate 203 with different high-performance alloy coatings, the valve can cope with a variety of harsh working conditions such as solid particles, strong corrosion, and strong erosion.

[0060] After assembly and debugging, the valve body 101 is connected to the external pipeline. After packing is installed in the upper stuffing box 104a, it cooperates with the packing gland of the external drive unit to achieve a dynamic seal on the transmission valve shaft 301a. The connecting flange 106 at the top of the lower stuffing box 104b, with its gasket 107, provides a good static seal. After connecting the drive unit, several full-stroke opening and closing operations are performed to put the valve into use. During this opening and closing process, the floating valve seat 202, under the wedge force of the double eccentric structure, can make slight adaptive adjustments. Its sealing surface 212 matches the valve plate sealing surface 213, thus finding the optimal contact position and angle to ensure the most reliable sealing effect in actual working conditions.

[0061] The maintenance procedure begins by disassembling the external drive unit connected to the valve shaft 301. Then, the entire valve is removed from the pipeline. The valve body 101, with the end containing the pressure plate 201 facing upwards, is placed and the gasket 107 is removed. The countersunk bolts 206 on the pressure plate 201 are then removed sequentially, allowing the pressure plate 201 and valve seat 202 to be taken out of the mounting groove 102 and valve seat cavity 103. The fixing bolts 304 are loosened and pulled out, allowing the valve shaft 301 to be extracted from the stuffing box 104, and the valve plate 203 to be removed from the valve body 101. After disassembly, all components can be cleaned and inspected, and worn seals (such as the valve seat 202 and valve plate 203) can be quickly replaced. After replacement, the valve body is reassembled according to the installation steps to complete the entire maintenance process. The entire process requires no special tools, greatly improving valve maintenance efficiency.

[0062] During opening and closing, the rigid connection between the transmission valve shaft 301a and the upper bearing 214a ensures that the external driving torque can be effectively transmitted to the valve plate 203. The integrally formed shoulder 302 on the valve shaft 301, while forming an auxiliary seal by tightly fitting with the end face of the bearing 214, also effectively protects the mounting and positioning structure, preventing it from failing due to erosion by the medium and ensuring long-term functionality. The bearing 216 provides a stable and low-friction rotational support for the pivoting system, ensuring smooth and stable opening and closing.

[0063] During valve opening, because the pivot axis L of valve shaft 301 is eccentrically set with the flow channel center axis M of valve body 101, the valve plate 203, at the initial rotation angle, can quickly and completely detach from the sealing surface 212, avoiding squeezing and friction between the two during subsequent opening. As valve plate 203 rotates to a position parallel to the flow channel, the valve is fully opened.

[0064] During valve closure, the valve plate 203 remains non-contact with the valve seat 202 at most angles. Only when approaching full closure does the valve plate sealing surface 213 gradually approach the sealing surface 212. During this process, the sealing surface 212 effectively scrapes the valve plate sealing surface 213, removing scale, impurities, or solid particles adhering to its surface, thus achieving a self-cleaning function. During final closure, the valve plate 203 applies a wedging force to the valve seat 202. At this time, the floating valve seat 202, under the combined action of the pipeline medium pressure and this wedging force, can make slight adaptive adjustments, with its sealing surface 212 matching the valve plate sealing surface 213 to form a tight and reliable shut-off seal.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A full-bore metal-sealed rotary ball valve for water supply and drainage, characterized in that: include, A connecting unit (100) includes a valve body (101), an installation groove (102) is provided at the water inlet end of the valve body (101), a valve seat cavity (103) is coaxially provided at the bottom of the installation groove (102), and a stuffing box (104) is provided on the valve body (101). The central axis of the stuffing box (104) is spatially perpendicular to but does not intersect with the central axis of the flow channel of the valve body (101). The barrier unit (200) includes a pressure plate (201) fixedly installed on the mounting groove (102), a valve seat (202) floatingly disposed in the valve seat cavity (103), and a valve plate (203) pivotally disposed in the communication unit (100) to cooperate with the valve seat (202) to achieve barrier, and a connecting bracket (204) disposed on the non-sealing surface of the valve plate (203). The pivoting unit (300) includes a valve shaft (301) passing through the stuffing box (104), and the connecting bracket (204) is coupled to the valve shaft (301) to realize the pivoting movement of the valve plate (203).

2. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 1, characterized in that: The mounting groove (102) has a threaded hole (105) on the bottom surface, and the stuffing box (104) has a connecting flange (106) on the top.

3. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 2, characterized in that: The stuffing box (104) includes an upper stuffing box (104a) and a lower stuffing box (104b), and a gasket (107) is sealed on the connecting flange (106) at the top of the lower stuffing box (104b).

4. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 3, characterized in that: The pressure plate (201) has a countersunk hole (205) corresponding to the threaded hole (105). Countersunk bolts (206) pass through the threaded hole (105) and the countersunk hole (205). The pressure plate (201) is fixedly installed on the mounting groove (102) by the countersunk bolts (206).

5. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 4, characterized in that: The valve seat (202) includes a limiting ring (207) and a sealing body (208). On the limiting ring (207), an annular groove (209) is provided on the surface corresponding to the pressure plate (201) and the surface corresponding to the inner peripheral wall of the valve seat cavity (103), and a first elastic sealing ring (210a) is provided in the annular groove (209). A stepped surface (211) is formed at the connection between the limiting ring portion (207) and the sealing body portion (208), and a second elastic sealing ring (210b) is provided on the stepped surface (211). The curved surface of the sealing body (208) that contacts and seals with the valve plate (203) is the sealing surface (212), and the sealing surface (212) and the valve plate (203) form a rounded transition at the contact point.

6. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 5, characterized in that: The surface of the valve plate (203) that contacts and seals the sealing surface (212) is the valve plate sealing surface (213).

7. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 6, characterized in that: Both the sealing surface (212) and the valve plate sealing surface (213) are metal hard-face sealing rings.

8. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 7, characterized in that: The connecting bracket (204) is provided with an upper shaft seat (214a) and a lower shaft seat (214b). The upper shaft seat (214a) has a mounting hole (215), and the lower shaft seat (214b) is provided with a bearing (216).

9. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 8, characterized in that: The valve shaft (301) has an integrally formed shoulder (302), which contacts the end face of the bearing seat (214) to form an axial seal.

10. The full-bore metal-sealed rotary ball valve for water supply and drainage according to claim 9, characterized in that: The valve shaft (301) includes a transmission valve shaft (301a) and a pivot valve shaft (301b). The transmission valve shaft (301a) passes through the upper stuffing box (104a). The transmission valve shaft (301a) has a through hole (303) corresponding to the mounting hole (215). The transmission valve shaft (301a) is fixedly connected to the upper shaft seat (214a) by fixing bolts (304) passing through the mounting hole (215) and the through hole (303). One end of the pivot valve shaft (301b) is housed in the lower stuffing box (104b), and the other end of the pivot valve shaft (301b) is rotatably connected to the lower shaft seat (214b) via the bearing (216).

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