Sealing flat valve with replaceable double movable valve seats

Abstract

The sealing flat valve comprises a valve body, a valve rod, the valve seats, a gate plate and a hand wheel, the valve seats and the gate plate are arranged in the valve body, the bottom of the valve rod is connected with the gate plate, the valve rod is connected with the valve body through a valve rod nut, the hand wheel is connected with the valve rod nut, and the valve rod is connected with the valve rod nut. Two inner pipes used for installing the valve seat are arranged in the valve body and located on the two sides of the flashboard respectively, the valve seat is arranged in the inner pipes, connecting mechanisms are arranged on the inner pipes, the connecting mechanisms are detachably connected with the inner pipes, one end of the valve seat abuts against the flashboard, and the other end of the valve seat abuts against the connecting mechanisms. According to the design of the structure, when the valve seat of the flat valve is replaced, all parts in the valve body do not need to be disassembled and then assembled, and particularly, structures related to the flashboard do not need to be disassembled, so that the number of the parts needing to be disassembled is greatly reduced, the workload during maintenance can be effectively reduced, and the complexity of disassembling and assembling the flat valve is reduced.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically, to a double-moving-seat replaceable sealing flat valve. Background Technology

[0002] As a critical sealing element in industrial piping systems, the flat plate valve faces severe challenges during long-term operation. During use, the valve seat is continuously subjected to the squeezing action of the valve plate; this repeated mechanical stress leads to irreversible wear of the valve seat material, resulting in a decline in its sealing performance. However, an even more challenging issue lies in the maintenance process of replacing the valve seat.

[0003] Flat plate valves typically employ a floating seat structure, allowing for individual replacement. However, in practical applications, the replacement process is exceptionally cumbersome and complex. Current flat plate valve designs often place the seat inside the valve body. When a worn seat needs replacement, technicians must completely disassemble the entire valve—this includes removing the valve cover, taking out the gate, and other steps.

[0004] Such a complete disassembly is not only time-consuming and labor-intensive, but also highly prone to causing accidental damage to other intact components during the disassembly process. Therefore, how to reduce the number of parts that need to be disassembled when replacing the valve seat is the technical problem that this application aims to solve. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a double-movable valve seat replaceable sealing flat valve, comprising: a valve body, a valve stem, a valve seat, a gate, and a handwheel. The valve seat and the gate are disposed within the valve body. The bottom of the valve stem is connected to the gate, and the top of the valve stem penetrates through the valve body. The valve stem and the valve body are connected by a valve stem nut. The handwheel is connected to the valve stem nut. The valve body has two inner tubes for mounting the valve seat, which are located on both sides of the gate. The valve seat is disposed within the inner tube. A connecting mechanism is provided on the inner tube, and the connecting mechanism is detachably connected to the inner tube. One end of the valve seat abuts against the gate, and the other end abuts against the connecting mechanism.

[0007] Preferably, the inner wall of the inner tube near the gate is provided with a first annular groove, the inner diameter R of the first annular groove is larger than the inner diameter r of the inner tube, and the connecting mechanism and the valve seat are both located in the first annular groove.

[0008] Preferably, the top of the inner tube is provided with a rectangular opening, the length D of which is adapted to the inner diameter R of the first annular groove, and the width d of which is not less than the length s of the valve seat.

[0009] Preferably, the connecting mechanism consists of a baffle and a fixing member. The baffle is located in the first annular groove of the inner tube and extends to the outside of the inner tube through a rectangular opening. The baffle is provided with a flow hole, the inner diameter of which is adapted to the inner diameter of the inner tube. One end of the valve seat abuts against the gate plate, and the other end abuts against the baffle. The fixing member is located on the top of the baffle. The baffle is connected to the outer wall of the inner tube or the valve body through the fixing member.

[0010] Preferably, the baffle is provided with an annular sealing groove, and a sealing ring is provided in the sealing groove.

[0011] Preferably, the baffle is provided with a second annular groove on the side facing the valve seat. The second annular groove surrounds the flow hole and is located on the same central axis as the flow hole. The spring of the valve seat is located in the second annular groove.

[0012] Preferably, the inner wall of the second annular groove is an inclined surface.

[0013] Preferably, the outer wall of the inner tube is provided with a first hole for fastening connection.

[0014] Preferably, the baffle is a first baffle, the fixing member is a first fixing member, a connecting plate is provided on the top of the first baffle, the connecting plate extends from the first baffle toward the first hole, a second hole is provided on the connecting plate, the second hole and the first hole are located on the same central axis, the first fixing member passes through the second hole and is connected to the first hole.

[0015] Preferably, the first hole is a threaded hole, the first fastener is a screw, and the first fastener passes through the second hole and is threadedly connected to the first hole.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: The above structural design allows for the replacement of the valve seat in a flat plate valve without disassembling and reassembling all the parts inside the valve body, especially without removing the gate-related structure. This significantly reduces the number of parts that need to be disassembled, effectively reducing the workload during maintenance and simplifying the disassembly and assembly of the flat plate valve.

[0017] The double-movable valve seat replaceable sealing plate valve of the present invention, other advantages, objectives and features of the invention will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a cross-sectional view of the left side of the present invention.

[0019] Figure 2 A cross-sectional view of the main view of the present invention when a connecting mechanism is provided.

[0020] Figure 3 A cross-sectional structural diagram of the present invention is shown when the connecting mechanism is in the first embodiment (partial structures are not shown).

[0021] Figure 4 The first embodiment of the invention is shown as a cross-sectional view of the main view (partial structures are not shown).

[0022] Figure 5 This is a schematic diagram of the valve seat and the connecting mechanism in the first embodiment.

[0023] Figure 6 This is a cross-sectional structural diagram of the connecting mechanism in the first embodiment.

[0024] Figure 7 for Figure 6 Exploded view.

[0025] Figure 8 This is a schematic diagram of the rectangular opening when the connecting mechanism is implemented in the first embodiment.

[0026] Figure 9 This is a cross-sectional view of a second embodiment of the connecting mechanism.

[0027] Figure 10 This is a structural diagram of a second embodiment of the connecting mechanism.

[0028] Figure 11 This is a schematic diagram of the assembly of the second embodiment of the connecting mechanism, where A is a schematic diagram of the locking of the locking block and the locking slot, and B is a schematic diagram of the locking block and the locking slot being unlocked.

[0029] In the diagram: 1 Valve body, 11 Inner tube, 12 Slot, 2 Valve stem, 3 Valve seat, 4 Gate, 5 Handwheel, 6 Connecting mechanism, 71 First baffle, 711 Connecting plate, 72 Second baffle, 721 Mounting platform, 722 Locking block, 7221 Connecting section, 7222 Locking section, 81 First fixing component, 82 Second fixing component, 821 Limit knob, 822 Adjusting screw, 823 Support block, 824 Reset component, 9 Sealing ring. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0031] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0032] like Figures 1-11 As shown, this invention provides a double-movable valve seat replaceable sealing flat valve, comprising: a valve body 1, a valve stem 2, a valve seat 3, a gate 4, and a handwheel 5. The valve seat 3 and the gate 4 are disposed within the valve body 1. The bottom of the valve stem 2 is connected to the gate 4, and the top of the valve stem 2 penetrates the valve body 1. The valve stem 2 and the valve body 1 are connected by a valve stem nut. The handwheel 5 is connected to the valve stem nut. The valve body 1, valve stem 2, valve seat 3, gate 4, handwheel 5, and valve stem nut are all commercially available products. The difference from existing technologies is... The valve body 1 has two inner tubes 11 for mounting valve seats 3. The inner tubes 11 can be formed by extending inwards from the pipes of the valve body 1, allowing the inner tubes 11 to be integrally formed with the valve body 1 during production. The two inner tubes 11 are located on opposite sides of the gate plate 4. The valve seat 3 is disposed within the inner tube 11, and a connecting mechanism 6 is provided on each inner tube 11. The connecting mechanism 6 is detachably connected to the inner tube 11. One end of the valve seat 3 abuts against the gate plate 4, and the other end abuts against the connecting mechanism 6. Depending on design requirements, both inner tubes 11 can be equipped with the connecting mechanism 6 (if this implementation is adopted, the flat valve does not need to distinguish between the inlet and outlet directions during installation), or it can be provided only on one inner tube 11 (usually located on the inlet side of the valve body 1, such as...). Figure 2 (As shown).

[0033] To improve assembly efficiency when assembling a flat plate valve, the connecting mechanism 6 can be installed on the inner tube 11 first, and then the valve seat 3 and other parts can be installed.

[0034] If the valve seat 3 needs to be replaced during the use of the flat plate valve, it is not necessary to disassemble the entire valve body 1. After opening the valve cover, the connecting mechanism 6 can be directly removed from the inner tube 11. Then, the damaged valve seat 3 can be taken out from the position where the connecting mechanism 6 is installed on the inner tube 11. Then, the new valve seat 3 can be inserted from the position where the connecting mechanism 6 is installed on the inner tube 11. After that, the connecting mechanism 6 is inserted into the inner tube 11. During the process of inserting the connecting mechanism 6 into the inner tube 11, pressure will be applied to the valve seat spring of the valve seat 3, so that the replaced valve seat 3 can be pressed against the gate 4. Finally, the connecting mechanism 6 is connected to the inner tube 11.

[0035] The above structural design allows for the replacement of valve seat 3 in the flat plate valve without disassembling and reassembling all parts inside the valve body 1, especially without removing the gate-related structure. This significantly reduces the number of parts that need to be disassembled, effectively reducing the workload during maintenance and simplifying the disassembly and assembly of the flat plate valve.

[0036] Furthermore, a first annular groove is provided on the inner wall of the inner tube 11 near the gate 4, and the inner diameter R of the first annular groove is larger than the inner diameter r of the inner tube 11, such as... Figure 4 As shown, this allows the inner end face of the first annular groove to form a step inside the inner tube 11. The connecting mechanism 6 and the valve seat 3 are both located inside the first annular groove. The connecting mechanism 6 abuts against the step (i.e., the inner end face of the first annular groove), and one end of the valve seat 3 abuts against the connecting mechanism 6, while the other end abuts against the gate plate 4.

[0037] Furthermore, a rectangular opening is provided at the top of the inner tube 11. The length D of the rectangular opening is adapted to the inner diameter R of the first annular groove, and the width d of the rectangular opening is not less than the length s of the valve seat 3. Figure 4 and Figure 8 As shown. Typically, the width d of the rectangular opening is slightly larger than the length s of the valve seat 3, making it easier to remove and insert the valve seat 3 from the rectangular opening.

[0038] Furthermore, the connecting mechanism 6 consists of a baffle and a fixing member. The baffle is located in the first annular groove of the inner tube 11 and extends to the outside of the inner tube 11 through a rectangular opening. A flow hole is provided on the baffle, and the inner diameter of the flow hole is adapted to the inner diameter of the inner tube 11. One end of the valve seat 3 abuts against the gate 4, and the other end abuts against the baffle. When installing the connecting mechanism 6, the baffle can be inserted into the interior of the inner tube 11 through the rectangular opening. When the baffle is fully inserted into the inner tube 11, the side of the baffle away from the valve seat 3 abuts against the step (i.e., the inner end face of the first annular groove). The top of the baffle is located outside the inner tube 11. The fixing member is provided on the top of the baffle. The baffle is connected to the outer wall of the inner tube 11 through the fixing member (see the first embodiment) or connected to the valve body 1 (see the second embodiment).

[0039] Furthermore, in order to ensure the sealing performance of the connecting mechanism 6, an annular sealing groove is provided on the baffle, and a sealing ring 9 is provided in the sealing groove. When the baffle is fully inserted into the inner tube 11, the sealing groove is located in the rectangular opening, so that the sealing ring 9 can effectively seal the rectangular opening. The design of the sealing groove can effectively prevent the sealing ring 9 from coming off the baffle under the action of high pressure fluid.

[0040] In the aforementioned embodiments, we mentioned that the baffle can be fixed inside the inner tube 11 by a fastener. Under the action of the valve seat, step, and fastener, the baffle can be axially fixed. To further enhance the radial fixing effect of the baffle, a second annular groove is provided on the side of the baffle facing the valve seat 3. The second annular groove surrounds the flow hole and is located on the same central axis as the flow hole. The spring of the valve seat 3 is located in the second annular groove. When installing the connecting mechanism 6, as the baffle moves down, the spring of the valve seat 3 can fall smoothly into the second annular groove, thereby limiting the position of the valve seat 3 through the second annular groove. At the same time, through the cooperation between the spring of the valve seat 3 and the second annular groove and the fixing of the fastener, the position of the baffle can be limited radially. Furthermore, to avoid the spring of the valve seat 3 getting stuck between itself and the second annular groove when the baffle is disassembled, the inner wall of the second annular groove is set as an inclined surface, such as... Figure 5 As shown.

[0041] As one of many implementation methods, this embodiment provides a method with the simplest structure and lowest cost. In this embodiment, the outer wall of the inner tube 11 is provided with a first hole for fastening connection. Preferably, the first hole is a threaded hole. To facilitate the installation of the baffle, the top outer wall of the inner tube 11 is usually set as a plane, such as... Figures 6-8 As shown, the first hole is typically located on the side of the rectangular opening furthest from the valve seat 3, such as... Figure 5 As shown.

[0042] The baffle is a first baffle 71. The shape of the first baffle 71 is adapted to the rectangular opening to facilitate the entry and exit of the first baffle 71 into the rectangular opening. The bottom of the first baffle 71 is arc-shaped, and the arc is concentric with the first annular groove. The diameter of the arc is the same as the inner diameter of the first annular groove.

[0043] The fixing member is a first fixing member 81, preferably a screw. A connecting plate 711 is provided on the top of the first baffle 71, the connecting plate 711 is perpendicular to the first baffle 71, the connecting plate 711 extends from the first baffle 71 towards the first hole, and a second hole is provided on the connecting plate 711. The second hole and the first hole are located on the same central axis, and the first fixing member 81 passes through the second hole and is threadedly connected to the first hole. Figure 5 As shown.

[0044] When assembling the flat plate valve, first insert the first baffle 71 into the inner tube 11 through the rectangular opening, and make the second hole and the first hole on the same side. As the first baffle 71 is inserted, the arc-shaped bottom of the first baffle 71 abuts against the first annular groove, and the connecting plate 711 abuts against the outer wall of the inner tube 11. Then, pass the screw through the second hole and connect it to the first hole to complete the installation of the connecting mechanism 6.

[0045] Through the above structural design, the connecting mechanism 6 can be directly applied to the existing flat plate valve. With simple modification, a rectangular opening is cut into the inner tube of the existing flat plate valve, and a first hole is drilled and threaded into the first hole. The connecting mechanism 6 can then be installed on the existing flat plate valve. Compared with the second embodiment described below, the first embodiment has a lower cost and can directly modify the existing stock, thereby saving production costs. The connecting mechanism 6 has a simple structure and is easy to process.

[0046] Although the first embodiment of the connecting mechanism 6 has the advantages mentioned above, it requires processing the inner tube 11 in addition to setting a rectangular opening, and also requires processing a first hole on the outer wall of the inner tube 11. For newly manufactured valve bodies 1, the thickness of the inner tube 11 is controllable, and the first embodiment is the optimal structural design.

[0047] When modifying inventory stock, the thickness of the inner tube 11 varies between different models of flat valves. It's easy for what should be a blind hole to be accidentally machined into a through hole. Although this can be sealed with rubber or other sealing materials, it still requires drilling another hole elsewhere. When drilling again, a second hole needs to be drilled at the corresponding position on the connecting plate 711. Therefore, unnecessary losses can easily occur during the modification of inventory stock.

[0048] Besides the uncontrollable thickness of the inner tube 11, the outer diameter of the inner tube 11 is also uncontrollable. As mentioned in the previous embodiments, in order to facilitate the installation of the baffle, the top outer wall of the inner tube 11 is usually set as a plane, so that after the first baffle 71 is inserted, the connecting plate 711 can abut against the plane. However, for the modification of the stock, the outer wall surface of the inner tube 11 is an arc-shaped surface, so the drilling position accuracy of the first hole is required to be high, because drilling on a non-planar surface is easy to deviate. This is also one of the reasons why the first hole and the second hole are often out of axis during the actual modification process.

[0049] To make the connecting mechanism 6 more suitable for inventory modification, we provide a second implementation method. In this embodiment, the baffle is connected to the valve body 1 by a fixing member. Two slots 12 are symmetrically arranged on the inner side wall of the valve body 1 (at the valve stem 2). The slots 12 are located above the inner tube 11 (i.e., the rectangular opening). The fixing member can engage with the slots 12.

[0050] Further, the baffle is a second baffle 72, the shape of which is adapted to the rectangular opening to facilitate the entry and exit of the second baffle 72. The bottom of the second baffle 72 is arc-shaped, and the arc is concentric with the first annular groove, the diameter of which is the same as the inner diameter of the first annular groove. A mounting platform 721 is provided on the top of the second baffle 72, and the mounting platform 721 is arranged along the length of the rectangular opening. Preferably, the mounting platform 721 is convex in shape on the top of the second baffle 72, such as... Figure 10 As shown.

[0051] The fixing component is a second fixing component 82, which is disposed on the mounting platform 721. The mounting platform 721 has two locking blocks 722, located on opposite sides of the second fixing component 82 and movably connected to the mounting platform 721. Typically, the bottom of each locking block 722 is U-shaped and axially connected to the mounting platform 721, allowing the locking block 722 to rotate relative to the platform 721. Figure 10 As shown.

[0052] Furthermore, the second fixing member 82 is composed of a limiting knob 821, an adjusting screw 822, a support block 823, and a reset member 824. The limiting knob 821 has a first limiting groove at its top and a second limiting groove at its bottom. The first limiting groove and the second limiting groove are connected by a threaded hole. The adjusting screw 822 passes through the threaded hole through the first limiting groove and exits through the second limiting groove to connect with the top of the support block 823 (it can be a fixed connection or a threaded connection). The adjusting screw 822 is threadedly connected to the threaded hole of the limiting knob 821, so that when the limiting knob 821 is rotated, it can move up and down relative to the adjusting screw 822. The reset member 824 is usually a spring, which is sleeved on the outside of the adjusting screw 822. The top of the reset member 824 is located in the second limiting groove and abuts against the inner top of the second limiting groove. The bottom of the reset member 824 abuts against the top of the support block 823. The reset component 824 always tends to keep the limit knob 821 away from the support block 823, thereby preventing the limit knob 821 from falling off and causing the locking of the card block 722 and the card slot 12 to be released.

[0053] Furthermore, the bottom of the support block 823 is U-shaped and is movably connected to the mounting platform 721, usually by a shaft connection, so that the support block 823 and the two locking blocks 722 can rotate relative to the mounting platform 721.

[0054] Furthermore, the locking block 722 is composed of a connecting section 7221 and a locking section 7222. The bottom of the connecting section 7221 is U-shaped and is axially connected to the mounting platform 721. The top of the connecting section 7221 is connected to the bottom of the locking section 7222. The top of the locking section 7222 extends away from the limiting knob 821, such as... Figure 9 As shown, this causes the center of gravity of the locking block 722 to be located on the side away from the limiting knob 821 of the connecting shaft (between the locking block 722 and the mounting platform 721), thus ensuring that the locking block 722 always tends to flip away from the limiting knob 821. When the second baffle 72 is inserted into the inner tube 11, the top of the locking section 7222 is located in the locking groove 12, preventing the connecting mechanism 6 from dislodging from the inner tube 11.

[0055] Furthermore, a third limiting groove is provided on the side of the connecting segment 7221 near the limiting knob 821, and a fourth limiting groove is provided on the outer wall of the limiting knob 821 along the circumferential direction. The cross-section of the fourth limiting groove is arc-shaped, such as... Figure 9 As shown, the diameter of the fourth limiting groove is smaller than the diameter of the limiting knob 821, and the portion of the limiting knob 821 located below the fourth limiting groove forms a boss that abuts against the bottom surface of the third limiting groove.

[0056] When assembling the connecting mechanism 6, first rotate the limiting knob 821 so that the boss of the limiting knob 821 abuts against the inner bottom surface of the third limiting groove. Under the pressure of the boss of the limiting knob 821, the locking block 722 flips towards the limiting knob 821, and the locking segment 7222 abuts against the limiting knob 821. At this time, the distance between the two locking segments 7222 and the farthest end from the limiting knob 821 is less than the distance between the two inner sidewalls of the valve body 1 (which are located on the same plane as the two locking segments 7222), and a locking platform is formed at the top opening of the third limiting groove. The locking platform is located at the position where the diameter of the fourth limiting groove is the smallest. Figure 11 As shown, this ensures that when the limit knob 821 is at its lowest position, the locking block 722 will not affect the movement of the connecting mechanism 6 within the valve body 1.

[0057] When the second baffle 72 is inserted into the inner tube 11, rotate the limiting knob 821 to move the limiting knob 821 upward relative to the adjusting screw 822. During the upward movement, the locking platform of the third limiting groove (at the top opening) moves along the fourth limiting groove and pushes the locking block 722 outward through the fourth limiting groove with its gradually increasing inner diameter, so that the locking section 7222 enters the locking slot 12.

[0058] When the limit knob 821 is rotated to the highest point, the adjusting screw 822 abuts against the inner bottom surface of the first limit groove, and the limit knob 821 is rotated to the limit position. At this time, the locking platform of the third limit groove (at the top opening) abuts against the boss, so that the locking block 722 can be fixed in the current position.

[0059] Through the above structural design, when modifying inventory, when making a rectangular opening, the groove 12 can be marked directly on the inner wall of the valve body 1. After processing the groove 12, it can be ensured that the locking block 722 and the second baffle 72 are on the same plane. Although the processing cost of the connecting mechanism 6 is slightly higher in the second embodiment than in the first embodiment, the second embodiment is faster than the first embodiment for modifying inventory (when sawing a rectangular opening, the saw blade will rub against the inner wall of the valve body 1, and the groove 12 can be directly processed on the indentation left by the saw blade, ensuring that the groove 12 and the rectangular opening are on the same plane), faster in assembly (no screwdriver or other tools are needed, the limit knob 821 can be rotated by hand), and has a higher yield rate.

[0060] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A double-moving-seat replaceable sealing flat valve, comprising: The valve body (1), valve stem (2), valve seat (3), gate (4) and handwheel (5) are provided. The valve seat (3) and gate (4) are disposed inside the valve body (1). The bottom of the valve stem (2) is connected to the gate (4). The top of the valve stem (2) passes through the valve body (1). The valve stem (2) and the valve body (1) are connected by a valve stem nut. The handwheel (5) is connected to the valve stem nut. The valve body (1) has two inner tubes (11) for installing the valve seat (3). The two inner tubes (11) are located on both sides of the gate (4). The valve seat (3) is disposed inside the inner tube (11). A connecting mechanism (6) is provided on the inner tube (11). The connecting mechanism (6) is detachably connected to the inner tube (11). One end of the valve seat (3) abuts against the gate (4) and the other end abuts against the connecting mechanism (6).

2. The double-movable valve seat replaceable sealing plate valve according to claim 1, characterized in that, The inner wall of the inner tube (11) near the gate (4) is provided with a first annular groove. The inner diameter R of the first annular groove is greater than the inner diameter r of the inner tube (11). The connecting mechanism (6) and the valve seat (3) are both located in the first annular groove.

3. The double-movable valve seat replaceable sealing plate valve according to claim 2, characterized in that, The top of the inner tube (11) is provided with a rectangular opening, the length D of which is adapted to the inner diameter R of the first annular groove, and the width d of which is not less than the length s of the valve seat (3).

4. The double-movable valve seat replaceable sealing plate valve according to claim 3, characterized in that, The connecting mechanism (6) consists of a baffle and a fixing member. The baffle is located in the first annular groove of the inner tube (11) and extends to the outside of the inner tube (11) through a rectangular opening. A flow hole is provided on the baffle. The inner diameter of the flow hole is adapted to the inner diameter of the inner tube (11). One end of the valve seat (3) abuts against the gate (4) and the other end abuts against the baffle. The fixing member is provided on the top of the baffle. The baffle is connected to the outer wall of the inner tube (11) or the valve body (1) through the fixing member.

5. The double-movable valve seat replaceable sealing plate valve according to claim 4, characterized in that, The baffle is provided with an annular sealing groove, and a sealing ring (9) is provided in the sealing groove.

6. The double-movable valve seat replaceable sealing plate valve according to claim 4, characterized in that, The baffle is provided with a second annular groove on the side facing the valve seat (3). The second annular groove surrounds the flow hole and is located on the same central axis as the flow hole. The spring of the valve seat (3) is located in the second annular groove.

7. The double-movable valve seat replaceable sealing plate valve according to claim 6, characterized in that, The inner wall of the second annular groove is an inclined surface.

8. The double-movable valve seat replaceable sealing plate valve according to claim 4, characterized in that, The outer wall of the inner tube (11) is provided with a first hole for fastening connection.

9. The double-movable valve seat replaceable sealing plate valve according to claim 8, characterized in that, The baffle is a first baffle (71), the fixing member is a first fixing member (81), the top of the first baffle (71) is provided with a connecting plate (711), the connecting plate (711) extends from the first baffle (71) toward the first hole, the connecting plate (711) is provided with a second hole, the second hole and the first hole are located on the same central axis, the first fixing member (81) passes through the second hole and is connected to the first hole.

10. The double-movable valve seat replaceable sealing plate valve according to claim 9, characterized in that, The first hole is a threaded hole, the first fixing member (81) is a screw, and the first fixing member (81) passes through the second hole and is threadedly connected to the first hole.

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