Fluorine lining gate valve

Abstract

The invention discloses a fluorine-lined gate valve, and relates to the field of fluorine-lined gate valves. The fluorine lining gate valve comprises a valve body, a connecting seat, a first valve plate, a plurality of second valve plates, a transmission unit and a rotating unit. According to the fluorine lining gate valve, when the two-way lead screw drives the corresponding second valve plate to rotate, the rotating angle of the second valve plate corresponds to the moving distance of the first valve plate at the moment, and then the flowing speed of liquid passing through the valve body in a pipeline is limited under the action of the second valve plate and the first valve plate; when the first valve plate moves, the two-way screw rod rotates to drive the rotating seat and the rotating rod to rotate, the rotating rod drives the second valve plates to rotate, the second valve plates are attached to the inner wall of the valve body, and under the action of the two second valve plates, the second valve plates can rotate by 90 degrees and are located at the maximum angle, so that the liquid flowing speed is maximum. And the valve body is subjected to secondary sealing, so that the sealing effect on the valve body is ensured.

Description

Technical Field

[0001] This invention relates to the field of fluoropolymer-lined gate valve technology, specifically to a fluoropolymer-lined gate valve. Background Technology

[0002] The working principle of a fluoropolymer-lined gate valve mainly relies on the raising and lowering of the gate to open and close the valve. When the handwheel is turned, the valve stem moves up and down, thereby driving the gate to rise and fall. When the gate is raised to the point where it is completely separated from the valve seat, the valve is in the fully open state. When the gate is lowered to the point where it is tightly fitted with the valve seat, the valve is in the fully closed state. During the closing process, external force is required to forcefully press the gate against the valve seat to ensure the sealing of the sealing surface.

[0003] In existing technologies, during the use of fluoropolymer-lined gate valves, the valve plate is brought into contact with the valve body by rotating the handwheel, thus sealing the valve body. However, relying solely on the contact between the valve plate and the valve body is insufficient to guarantee an effective seal. Furthermore, since the gate valve's opening and closing element is a gate, its movement direction is perpendicular to the fluid direction. This design limits the gate valve to only fully open or fully closed states, preventing flow regulation and thus failing to meet diverse application requirements. Therefore, we propose a fluoropolymer-lined gate valve. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a fluoropolymer-lined gate valve, which solves the problems that simply attaching a valve plate to the valve body cannot effectively guarantee the sealing effect of the valve body and that the gate valve can only achieve a fully open or fully closed state, without the ability to regulate the flow rate and meet different usage conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fluoropolymer-lined gate valve, comprising a valve body, a connecting seat, a first valve plate, multiple second valve plates, a transmission unit, and a rotating unit. The connecting seat is fixedly connected to the valve body, the first valve plate is slidably connected in the connecting seat, the second valve plates are located on both sides of the first valve plate, and the transmission unit and the rotating unit are respectively connected to the first valve plate and the second valve plate.

[0006] The transmission unit includes a bidirectional lead screw located below the valve body. A driven bevel gear is fixedly sleeved on the outer peripheral wall of the bidirectional lead screw. A master bevel gear meshes with the outer peripheral wall of the driven bevel gear. The master bevel gear is located directly below the first valve plate.

[0007] The rotating unit includes multiple nut seats threaded onto the outer peripheral wall of the bidirectional lead screw, and a rotating seat is provided above the nut seats.

[0008] Preferably, a valve cover is fixedly connected to the top end face of the connecting seat by bolts, a connecting frame is installed on the valve cover by bolts, and a handwheel is rotatably connected to the inner wall of the connecting frame and the valve cover.

[0009] Preferably, a threaded rod is fixedly connected to the top end face of the handwheel, and a first valve plate is threadedly connected to the outer peripheral wall of the threaded rod.

[0010] Preferably, a connecting rod is fixedly connected to the bottom end face of the handwheel, the connecting rod is rotatably connected to the inner wall of the valve body, and the connecting rod is inserted into the inside of the main bevel gear.

[0011] Preferably, a protective seat is fixedly connected to the bottom end face of the valve body, and the protective seat is rotatably connected to the bidirectional lead screw.

[0012] Preferably, a fixed seat is fixedly connected to the top end face of the nut seat, and a sliding seat is rotatably connected to the top end face of the fixed seat.

[0013] Preferably, the sliding seat is slidably connected to the inner wall of the rotating seat.

[0014] Preferably, a rotating rod is fixedly connected to the top end face of the rotating seat, and the rotating rod is rotatably connected to the inside of the valve body.

[0015] Preferably, the top end face of the rotating rod is fixedly connected to the second valve plate, and the second valve plate is rotatably connected to the inner wall of the valve body.

[0016] This invention discloses a fluoropolymer-lined gate valve, which has the following beneficial effects:

[0017] When the handwheel of this fluoropolymer-lined gate valve is turned, the handwheel rotates on the valve body. At the same time, the first valve plate, which is threaded to the outer circumferential wall of the handwheel, slides along the connecting seat. At this time, the first valve plate separates from the bottom of the valve body, allowing liquid to flow. Meanwhile, the connecting rod rotates on the inner wall of the valve body, causing the connecting rod to drive the main bevel gear to rotate. The rotation of the main bevel gear causes the meshing driven bevel gear to rotate, which in turn drives the bidirectional lead screw to rotate in the protective seat.

[0018] In this fluoropolymer-lined gate valve, the two nut seats move in opposite directions when the bidirectional screw rotates, causing the sliding seat to slide along the inner wall of the rotating seat, which in turn causes the rotating rod to rotate, so that the second valve plate, which is fixedly connected to the rotating rod, rotates on the inner wall of the valve body.

[0019] In this fluoropolymer-lined gate valve, when the bidirectional screw drives the corresponding second valve plate to rotate, the rotation angle of the second valve plate corresponds to the movement distance of the first valve plate. Thus, under the action of the second and first valve plates, the flow velocity of the liquid in the pipeline through the valve body is simultaneously limited. When the first valve plate moves and completely separates from the valve body, the second valve plate rotates 90 degrees to its maximum angle, and the liquid flow velocity is at its maximum. At the same time as the first valve plate moves, the bidirectional screw rotates, driving the rotating seat and rotating rod to rotate. At this time, the rotating rod drives the second valve plate to rotate, so that the second valve plate is in contact with the inner wall of the valve body. Under the action of the two second valve plates, the valve body is sealed twice, ensuring the sealing effect of the valve body. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a front view of the present invention;

[0023] Figure 3 This is a cross-sectional view of the present invention;

[0024] Figure 4 This is a schematic diagram showing the connection between the first valve plate and the second valve plate of the present invention;

[0025] Figure 5 This is a schematic diagram showing the connection between the transmission unit and the rotation unit of the present invention;

[0026] Figure 6 For the present invention Figure 5 Enlarged view of the middle section structure.

[0027] In the diagram: 1. Valve body; 101. Protective seat; 2. Connecting seat; 201. Valve cover; 3. Connecting frame; 4. Handwheel; 401. Threaded rod; 5. First valve plate; 6. Second valve plate; 7. Transmission unit; 701. Two-way lead screw; 702. Driven bevel gear; 703. Main bevel gear; 704. Connecting rod; 8. Rotating unit; 801. Nut seat; 802. Fixed seat; 803. Sliding seat; 804. Rotating seat; 805. Rotating rod. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This application provides a fluoropolymer-lined gate valve, which solves the problems that simply attaching a valve plate to the valve body 1 cannot effectively guarantee the sealing effect of the valve body 1 and that the gate valve can only achieve a fully open or fully closed state, without the ability to regulate the flow rate and meet different usage conditions. When the handwheel 4 is rotated, the first valve plate 5 slides along the connecting seat 2. At this time, the first valve plate 5 separates from the bottom of the valve body 1, allowing liquid to flow. At the same time, the connecting rod 704 rotates on the inner wall of the valve body 1, driving the main bevel gear 703 and the driven bevel gear 702 to rotate. Subsequently, the driven bevel gear 702 rotates, driving the bidirectional screw 701 to rotate. The two nut seats 801 move in opposite directions on the bidirectional screw 701, driving the rotating rod 805 to rotate, so that the second valve plate 6, which is fixedly connected to the rotating rod 805, rotates on the inner wall of the valve body 1.

[0030] At this time, the rotation angle of the second valve plate 6 corresponds to the moving distance of the first valve plate 5. Thus, under the action of the second valve plate 6 and the first valve plate 5, the flow speed of the liquid in the pipeline through the valve body 1 is limited. When the first valve plate 5 moves and completely separates from the valve body 1, the second valve plate 6 rotates ninety degrees, reaching its maximum angle, and the liquid flow speed is at its maximum. At the same time as the first valve plate 5 moves, the bidirectional screw 701 rotates, driving the rotating seat 804 and the rotating rod 805 to rotate. At this time, the rotating rod 805 drives the second valve plate 6 to rotate, so that the second valve plate 6 is in contact with the inner wall of the valve body 1. Under the action of the two second valve plates 6, the valve body 1 is sealed twice, ensuring the sealing effect of the valve body 1.

[0031] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0032] This invention discloses a fluoropolymer-lined gate valve.

[0033] According to the appendix Figure 1-6As shown, the device includes a valve body 1, a connecting seat 2, a first valve plate 5, multiple second valve plates 6, a transmission unit 7, and a rotating unit 8. Flanges are fixedly connected to both sides of the valve body 1, connecting the valve body 1 to the pipeline. Sealing rings are provided on the inner walls of both sides of the valve body 1 to further seal the valve body 1 and the pipeline. The connecting seat 2 is fixedly connected to the valve body 1, and the first valve plate 5 is slidably connected in the connecting seat 2. A sliding groove is provided on the inner wall of the connecting seat 2, and the first valve plate 5 is slidably connected to the sliding groove of the connecting seat 2, thereby limiting the sliding path of the first valve plate 5 and ensuring the stability of the sliding of the first valve plate 5.

[0034] The second valve plate 6 is located on both sides of the first valve plate 5. The second valve plate 6 seals both sides of the first valve plate 5, thereby further ensuring the sealing of the inside of the valve body 1 and ensuring the sealing performance of the fluoropolymer-lined gate valve. The transmission unit 7 and the rotation unit 8 are respectively connected to the first valve plate 5 and the second valve plate 6. A sealing ring is provided on the outer peripheral wall of the second valve plate 6 to ensure the sealing of the valve body 1 by the second valve plate 6. The first valve plate 5 is inserted into the inner wall of the valve body 1. A sealing gasket is provided at the contact point between the first valve plate 5 and the valve body 1 to ensure the sealing of the valve body 1 by the first valve plate 5.

[0035] The transmission unit 7 includes a bidirectional lead screw 701 located below the valve body 1. A driven bevel gear 702 is fixedly sleeved on the outer peripheral wall of the bidirectional lead screw 701. A master bevel gear 703 meshes with the outer peripheral wall of the driven bevel gear 702. The master bevel gear 703 is located directly below the first valve plate 5. When the handwheel 4 is rotated, the handwheel 4 rotates on the valve body 1. At the same time, the first valve plate 5, which is threaded to the outer peripheral wall of the handwheel 4, slides along the connecting seat 2. At this time, the first valve plate 5 separates from the bottom of the valve body 1 to allow liquid flow. Meanwhile, the connecting rod 704 rotates on the inner wall of the valve body 1, causing the connecting rod 704 to drive the master bevel gear 703 to rotate. The rotation of the master bevel gear 703 causes the driven bevel gear 702, which meshes with it, to rotate. Subsequently, the rotation of the driven bevel gear 702 drives the bidirectional lead screw 701 to rotate in the protective seat 101.

[0036] The rotating unit 8 includes multiple nut seats 801 threadedly connected to the outer peripheral wall of the bidirectional lead screw 701. A rotating seat 804 is provided above the nut seats 801. Under the rotation of the bidirectional lead screw 701, the two nut seats 801 move in opposite directions, causing the sliding seat 803 to slide along the inner wall of the rotating seat 804, which in turn causes the rotating rod 805 to rotate, so that the second valve plate 6, which is fixedly connected to the rotating rod 805, rotates on the inner wall of the valve body 1.

[0037] The top end face of the connecting seat 2 is fixedly connected to the valve cover 201 by bolts. The connecting frame 3 is installed on the valve cover 201 by bolts. The connecting frame 3 and the inner wall of the valve cover 201 are rotatably connected to the handwheel 4. When it is necessary to open the valve body 1, the liquid in the pipeline flows through the valve body 1. At this time, the handwheel 4 is rotated on the inner wall of the connecting frame 3 and the valve cover 201 by rotating the threaded rod 401.

[0038] A threaded rod 401 is fixedly connected to the top end face of the handwheel 4. A first valve plate 5 is threadedly connected to the outer peripheral wall of the threaded rod 401. When the handwheel 4 is rotated, the handwheel 4 rotates on the valve body 1. At the same time, the first valve plate 5 threadedly connected to the outer peripheral wall of the handwheel 4 slides along the connecting seat 2. At this time, the first valve plate 5 separates from the bottom of the valve body 1. The liquid in the valve body 1 can flow through the gap between the first valve plate 5 and the valve body 1. The larger the distance between the first valve plate 5 and the valve body 1, the faster the liquid flows through the pipe.

[0039] A connecting rod 704 is fixedly connected to the bottom end face of the handwheel 4. The connecting rod 704 is rotatably connected to the inner wall of the valve body 1 and is inserted into the inside of the main bevel gear 703.

[0040] A protective seat 101 is fixedly connected to the bottom end face of the valve body 1. The protective seat 101 is rotatably connected to the double-acting screw 701. When the handwheel 4 is rotated, the handwheel 4 drives the connecting rod 704, which is fixedly connected to it, to rotate on the inner wall of the valve body 1. This causes the connecting rod 704 to drive the main bevel gear 703 to rotate. The rotation of the main bevel gear 703 causes the driven bevel gear 702, which meshes with it, to rotate. Subsequently, the rotation of the driven bevel gear 702 drives the double-acting screw 701 to rotate in the protective seat 101.

[0041] A fixed seat 802 is fixedly connected to the top end face of the nut seat 801, and a sliding seat 803 is rotatably connected to the top end face of the fixed seat 802.

[0042] The sliding seat 803 is slidably connected to the inner wall of the rotating seat 804. Since the nut seat 801 is threaded along the outer peripheral wall of the double-acting screw 701, and the nut seat 801 and the fixed seat 802 are fixedly connected, the sliding seat 803, which is rotatably connected to the fixed seat 802, slides on the inner wall of the rotating seat 804.

[0043] As the double-acting screw 701 rotates, the two nut seats 801 connected to the outer peripheral wall of the double-acting screw 701 move in opposite directions. As the nut seats 801 move, the fixed seat 802 moves accordingly. At this time, the fixed seat 802 drives the sliding seat 803 to slide along the inner wall of the rotating seat 804.

[0044] A rotating rod 805 is fixedly connected to the top end face of the rotating seat 804. The rotating rod 805 is rotatably connected to the inside of the valve body 1. The movement path of the rotating seat 804 is limited by the action of the rotating rod 805, and thus the movement path of the sliding seat 803 slidably connected to the inner wall of the rotating seat 804 is limited, so that the nut seat 801 slides along the outer peripheral wall of the double-acting screw 701 under the action of the double-acting screw 701.

[0045] The top end face of the rotating rod 805 is fixedly connected to the second valve plate 6. The second valve plate 6 is rotatably connected to the inner wall of the valve body 1. When the sliding seat 803 moves on the inner wall of the rotating seat 804, it pushes the rotating seat 804 to drive the rotating rod 805 to rotate. At the same time, the sliding seat 803 rotates relative to the fixed seat 802. Under the rotation of the rotating rod 805, the second valve plate 6, which is fixedly connected to the rotating rod 805, rotates on the inner wall of the valve body 1.

[0046] At this time, the two nut seats 801 on the bidirectional lead screw 701 move in opposite directions and have the same distance traveled, which in turn drives the two rotating seats 804 to rotate in opposite directions with the same rotation angle, which in turn causes the rotating rod 805 to drive the corresponding second valve plate 6 to rotate in opposite directions with the same rotation angle.

[0047] At this time, the rotation angle of the second valve plate 6 corresponds to the moving distance of the first valve plate 5. Thus, under the action of the second valve plate 6 and the first valve plate 5, the flow speed of the liquid in the pipeline through the valve body 1 is limited. When the first valve plate 5 moves and completely separates from the valve body 1, the second valve plate 6 rotates ninety degrees and is at its maximum angle, thus the liquid flow speed is at its maximum.

[0048] When it is necessary to seal the valve body 1 to prevent the flow of liquid in the pipeline, the handwheel 4 is moved by rotating the reverse rotating threaded rod 401. When the handwheel 4 moves the first valve plate 5 to fit against the valve body 1, the valve body 1 is sealed under the action of the first valve plate 5.

[0049] While the first valve plate 5 moves, the bidirectional lead screw 701 rotates, driving the rotating seat 804 and the rotating rod 805 to rotate. At this time, the rotating rod 805 drives the second valve plate 6 to rotate, so that the second valve plate 6 fits against the inner wall of the valve body 1. Under the action of the two second valve plates 6, the valve body 1 is sealed twice to ensure the sealing effect of the valve body 1.

[0050] Working principle: First, flanges are fixedly connected to both sides of the valve body 1. The valve body 1 is connected to the pipeline through the flanges. Sealing rings are provided on the inner walls of both sides of the valve body 1. The sealing rings further seal the valve body 1 and the pipeline.

[0051] When the valve body 1 is connected to the pipeline, the valve body 1 can be used normally to close or open the pipeline. When it is necessary to open the valve body 1, the liquid in the pipeline flows through the valve body 1. At this time, the handwheel 4 is rotated on the inner wall of the connecting frame 3 and the valve cover 201 by rotating the threaded rod 401.

[0052] When the handwheel 4 is rotated, it rotates on the valve body 1. At the same time, the first valve plate 5, which is threaded to the outer peripheral wall of the handwheel 4, slides along the connecting seat 2. At this time, the first valve plate 5 separates from the bottom of the valve body 1. The liquid in the valve body 1 can flow through the gap between the first valve plate 5 and the valve body 1. The greater the distance between the first valve plate 5 and the valve body 1, the faster the liquid flows through the pipe.

[0053] When the handwheel 4 is turned, the handwheel 4 drives the connecting rod 704, which is fixedly connected to it, to rotate on the inner wall of the valve body 1. This causes the connecting rod 704 to drive the main bevel gear 703 to rotate. The rotation of the main bevel gear 703 causes the meshing secondary bevel gear 702 to rotate. Subsequently, the rotation of the secondary bevel gear 702 drives the bidirectional lead screw 701 to rotate in the protective seat 101.

[0054] As the double-acting screw 701 rotates, the two nut seats 801 connected to the outer peripheral wall of the double-acting screw 701 move in opposite directions. As the nut seats 801 move, the fixed seat 802 moves accordingly. At this time, the fixed seat 802 drives the sliding seat 803 to slide along the inner wall of the rotating seat 804.

[0055] When the sliding seat 803 moves on the inner wall of the rotating seat 804, it pushes the rotating seat 804 to drive the rotating rod 805 to rotate. At the same time, the sliding seat 803 rotates relative to the fixed seat 802. Under the rotation of the rotating rod 805, the second valve plate 6, which is fixedly connected to the rotating rod 805, rotates on the inner wall of the valve body 1.

[0056] At this time, the two nut seats 801 on the bidirectional lead screw 701 move in opposite directions and have the same distance traveled, which in turn drives the two rotating seats 804 to rotate in opposite directions with the same rotation angle, which in turn causes the rotating rod 805 to drive the corresponding second valve plate 6 to rotate in opposite directions with the same rotation angle.

[0057] At this time, the rotation angle of the second valve plate 6 corresponds to the moving distance of the first valve plate 5. Thus, under the action of the second valve plate 6 and the first valve plate 5, the flow speed of the liquid in the pipeline through the valve body 1 is limited. When the first valve plate 5 moves and completely separates from the valve body 1, the second valve plate 6 rotates ninety degrees and is at its maximum angle, thus the liquid flow speed is at its maximum.

[0058] When it is necessary to seal the valve body 1 to prevent the flow of liquid in the pipeline, the handwheel 4 is moved by rotating the reverse rotating threaded rod 401. When the handwheel 4 moves the first valve plate 5 to fit against the valve body 1, the valve body 1 is sealed under the action of the first valve plate 5.

[0059] While the first valve plate 5 moves, the bidirectional lead screw 701 rotates, driving the rotating seat 804 and the rotating rod 805 to rotate. At this time, the rotating rod 805 drives the second valve plate 6 to rotate, so that the second valve plate 6 fits against the inner wall of the valve body 1. Under the action of the two second valve plates 6, the valve body 1 is sealed twice to ensure the sealing effect of the valve body 1.

[0060] The foregoing has shown and described 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 embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A fluoropolymer-lined gate valve, characterized in that, The device includes a valve body (1), a connecting seat (2), a first valve plate (5), multiple second valve plates (6), a transmission unit (7), and a rotating unit (8). The connecting seat (2) is fixedly connected to the valve body (1), the first valve plate (5) is slidably connected in the connecting seat (2), and the second valve plates (6) are located on both sides of the first valve plate (5). The transmission unit (7) and the rotating unit (8) are respectively connected to the first valve plate (5) and the second valve plate (6). The transmission unit (7) includes a bidirectional lead screw (701) located below the valve body (1). A driven bevel gear (702) is fixedly sleeved on the outer peripheral wall of the bidirectional lead screw (701). A master bevel gear (703) meshes with the outer peripheral wall of the driven bevel gear (702). The master bevel gear (703) is located directly below the first valve plate (5). The rotating unit (8) includes a plurality of nut seats (801) threadedly connected to the outer peripheral wall of the bidirectional lead screw (701), and a rotating seat (804) is provided above the nut seats (801).

2. The fluoropolymer-lined gate valve according to claim 1, characterized in that, The top end face of the connecting seat (2) is fixedly connected to the valve cover (201) by bolts. The valve cover (201) is mounted with a connecting frame (3) by bolts. The connecting frame (3) and the inner wall of the valve cover (201) are rotatably connected with a handwheel (4).

3. A fluoropolymer-lined gate valve according to claim 2, characterized in that, The top end face of the handwheel (4) is fixedly connected to a threaded rod (401), and the outer peripheral wall of the threaded rod (401) is threadedly connected to a first valve plate (5).

4. A fluoropolymer-lined gate valve according to claim 3, characterized in that, A connecting rod (704) is fixedly connected to the bottom end face of the handwheel (4). The connecting rod (704) is rotatably connected to the inner wall of the valve body (1). The connecting rod (704) is inserted into the inside of the main bevel gear (703).

5. A fluoropolymer-lined gate valve according to claim 4, characterized in that, A protective seat (101) is fixedly connected to the bottom end face of the valve body (1), and the protective seat (101) is rotatably connected to the bidirectional lead screw (701).

6. A fluoropolymer-lined gate valve according to claim 1, characterized in that, The top end face of the nut seat (801) is fixedly connected to a fixed seat (802), and the top end face of the fixed seat (802) is rotatably connected to a sliding seat (803).

7. A fluoropolymer-lined gate valve according to claim 6, characterized in that, The sliding seat (803) is slidably connected to the inner wall of the rotating seat (804).

8. A fluoropolymer-lined gate valve according to claim 7, characterized in that, A rotating rod (805) is fixedly connected to the top end face of the rotating seat (804), and the rotating rod (805) is rotatably connected to the inside of the valve body (1).

9. A fluoropolymer-lined gate valve according to claim 8, characterized in that, The top end face of the rotating rod (805) is fixedly connected to the second valve plate (6), and the second valve plate (6) is rotatably connected to the inner wall of the valve body (1).

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