A full flow-guiding flat gate valve with limit function

Abstract

The present invention discloses a full-flow-guiding flat gate valve with a limiting function, which relates to the technical field of flat gate valves, and comprises a connecting block, wherein the top of the connecting block is fixedly connected to the valve stem, the bottom of the connecting block is fixedly connected to an intermediate piece, a fixed plate is arranged on the outside of the intermediate piece, and there are two fixed plates, which are symmetrically arranged with the intermediate piece as the center, the fixed plate is slidably connected to the connecting block, the side of the fixed plate is fixedly connected to a connecting column, the outside of the connecting column is fixedly connected to a limiting ring, and the limiting ring is located inside the limiting groove. The full-flow-guiding flat gate valve with a limiting function can effectively ensure that when the valve is in the fully open position, the circular hole of the gate plate and the hole axes of the connecting pipes on both sides of the valve body are in a straight line through the clamping fit between the limiting ring and the clamping groove, that is, any cross section along the vertical line of the channel is an equal circular hole cross section, and when the limiting ring is located inside the limiting groove, the valve can be completely closed.

Description

Technical Field

[0001] The invention relates to the technical field of flat gate valves, in particular to a full-flow-guiding flat gate valve with a limiting function. Background Art

[0002] The flat gate valve is a sliding valve with a parallel valve plate as the closing part. The closing part can be a single valve plate or a double valve plate with a propping mechanism in between. The flat gate valve is one of the commonly used valves in the engineering and technical fields such as natural gas, petroleum, chemical industry, environmental protection, urban pipelines, gas pipelines, venting systems and steam storage devices. Its structure mainly consists of valve body, valve seat, parallel valve plate, valve stem, valve cover and valve stem drive mechanism. The flat gate valve has very small fluid resistance, and the sealing surface is less affected by the scouring and erosion of the medium. The opening and closing handwheel is labor-saving, and the opening and closing torque is only 1 / 2 of that of an ordinary handwheel, which can achieve easy opening and closing of the handwheel.

[0003] The traditional design of flat gate valve with guide holes has complex processing procedures, long production cycle, and more stringent precision requirements than conventional handwheels. After assembling the parts, it is often found that the guide holes on the valve plate cannot be located on the same axis as the two channels of the valve body when the handwheel is in the fully open position, resulting in non-circular cross-sections at any cross-section perpendicular to the axis of the handwheel channel. The production needs to disassemble, analyze, and repair parts again, the production cycle is long, the labor cost is very expensive, and its application scope is greatly limited. Summary of the invention

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a full-flow guide flat gate valve with a limiting function, comprising a valve body, a valve cover is fixedly installed on the top of the valve body, a limiting plate is fixedly connected to the top of the valve cover, a valve stem is arranged in the middle of the valve cover, the top of the valve stem passes through the limiting plate, the limiting plate is arranged in a trapezoidal shape, and the hand wheel is limited to prevent the hand wheel from driving the valve plate downward to collide with the bottom of the valve body, and the bottom of the valve stem extends to the inside of the valve body, and a hand wheel is arranged on the outside of the valve stem, and the hand wheel is threadedly connected to the valve stem;

[0005] A valve plate, the valve plate is fixedly connected to the bottom of the valve stem, and the valve plate is slidably connected to the valve body;

[0006] A sealing assembly, which is fixedly installed inside the valve body. There are two sealing assemblies, which are symmetrically arranged with the valve plate as the center.

[0007] The valve body comprises a shell, the outer side of the shell is fixedly connected with a connecting pipe, there are two connecting pipes, the two connecting pipes are symmetrically arranged with the shell as the center, the connecting pipes are arranged vertically with the shell, and the connecting pipes penetrate the shell and extend to the inside, the staff rotates the hand wheel, the hand wheel is threadedly connected with the valve stem, and the valve stem is driven to move up and down by rotating the hand wheel, thereby driving the valve plate at the bottom of the valve stem to move up and down along the vertical direction of the channel axis between the two side plates, when the driving hand wheel is rotated counterclockwise, the valve plate connected with the valve stem rises, the connecting pipe channels on both sides of the valve plate are opened, the valve is opened, and the fluid flows to the connecting pipe on the other side through the connecting pipe on one side, on the contrary, when the hand wheel is rotated clockwise, the valve plate descends, and the valve is closed, one end of the connecting pipe close to the valve plate is fixedly connected with the side plate, there are two side plates, a card slot is provided on the outer side of the side plate, a limit slot is provided on the outer side of the side plate, the card slot and the limit slot are respectively located on both sides of the valve plate, and the card slot is located above the limit slot;

[0008] Preferably, the valve plate includes a connecting block, the top of the connecting block is fixedly connected to the valve stem, the bottom of the connecting block is fixedly connected to an intermediate piece, a fixing plate is arranged on the outside of the intermediate piece, there are two fixing plates, the two fixing plates are symmetrically arranged with the intermediate piece as the center, the fixing plate is slidably connected to the connecting block, the side of the fixing plate is fixedly connected to a connecting column, the outside of the connecting column is fixedly connected to a limiting ring, when the flat gate valve is in a closed state, the limiting ring is located inside the limiting groove, and the limiting ring is in an inclined state, the staff rotates the driving hand wheel counterclockwise, the valve plate connected to the valve stem rises, and the limiting ring moves vertically upward with the fixing plate, and the limiting ring When the valve is fully opened, the limit ring moves to the horizontal plane of the slot, and the fixed plate is under the relative elastic force of the middle piece, and one end of the limit ring is located inside the slot. Through the clamping fit between the limit ring and the slot, it can be effectively ensured that when the valve is in the fully open position, the circular hole of the valve plate and the hole axes of the connecting pipes on both sides of the valve body are in a straight line, that is, any cross section along the vertical line of the channel is an equal circular hole cross section. When the limit ring is located inside the limit slot, the valve can be fully closed, and the limit ring is located inside the limit slot.

[0009] Preferably, a ring groove is provided on the inner wall of the side plate near the connecting pipe, a circular ring is fixedly connected to the inside of the ring groove, a through hole is provided on the outside of the circular ring, there are multiple through holes, and the multiple through holes are evenly distributed with the circular ring as the center, and a sewage outlet is provided at the bottom of the shell.

[0010] Preferably, the valve plate is located at the middle interval of the two side plates, and the valve plate is slidably connected to the two side plates, the fixed plate is fixedly connected with a protrusion near the outer side of the middle piece, the protrusion is set to be triangular, and the protrusions of the fixed plate on both sides of the middle piece are staggered, a circular hole is opened on the outer side of the fixed plate, the diameter of the circular hole is the same as the inner diameter of the connecting pipe, and an arc groove is opened on the outer side of the fixed plate. When the pressure increases, the pressure distribution between the toothed contact surfaces is more uniform, and the fixed plates and the middle ring of the left and right parts will fit more closely together to enhance the sealing effect. By setting the protrusion and the groove The meshing of the left and right fixed plates will produce a certain guiding effect during the opening and closing process, making the operation more labor-saving. At the same time, the engagement of the teeth can also prevent the valve plate from sliding or deflecting during operation, thereby improving the efficiency and stability of the operation. The arc groove and the connecting pipe are located on the same axis, and the arc groove is located above the circular hole. The side of the fixed plate close to the middle piece is fixedly connected to the limiting block, and the limiting block and the arc groove are located on the same axis. The fixed plate is fixedly connected to the outside of the limiting block close to the limiting block with a spring, and the spring is set to a spiral cone, and the spring is located on the fixed plate at one end away from the limiting block.

[0011] Preferably, the middle piece includes a positioning frame, which is located at the middle interval between the two fixed plates. A convex ring is fixedly connected to the outer side of the positioning frame, and the convex ring contacts the fixed plate on the side away from the positioning frame. An intermediate ring is fixedly connected to the outer wall of the positioning frame. When the staff closes the valve, the teeth between the fixed plates on the left and right parts of the valve plate and the middle piece engage with each other to form multiple sealing lines. This multi-pass sealing structure greatly improves the sealing performance of the valve and can effectively prevent medium leakage. Even if there are minor sealing problems at individual teeth, other teeth can still play a sealing role to ensure the overall sealing. At the same time, for media containing particles or impurities, the toothed contact surface is relatively easier to adapt, and the gap between the teeth can accommodate a certain amount of particles, reducing the direct damage of the particles to the sealing surface. At the same time, when the medium flow rate suddenly changes or an impact occurs, the fixed plates on the left and right parts and the middle piece can share the impact force together, reduce local stress concentration, and reduce the risk of damage to the valve plate. A groove is opened on the side of the middle ring close to the protrusion, and the grooves on both sides of the middle ring are slidably adapted to the protrusion interval.

[0012] Preferably, the sealing assembly includes a connecting ring, which is located inside the annular groove and is fixedly connected with a conical block at the outer edge of the connecting ring, the conical block penetrates the connecting ring and extends to the outside, and the outer wall of the connecting ring is provided with a V-shaped ring, which is elastic. When the sealing assembly is installed, the conical block on the connecting ring contacts and squeezes the circular ring, and the conical block is deformed by force, so that the conical block is located inside the through hole, and the connecting ring is clamped inside the annular groove. At this time, the sealing rings on both sides of the connecting ring are respectively in contact with the valve body and the valve plate, and the V-shaped ring is arranged between the two sealing rings. By utilizing the elastic properties of the V-shaped ring, a certain elastic pressure can be provided when the valve is closed, so that the sealing rings on both sides are tightly fitted to the valve plate and the valve body, and the gap caused by manufacturing errors, wear or temperature changes is automatically compensated, thereby ensuring the reliability of the seal and effectively preventing medium leakage. The V-shaped ring is rotatably connected to the connecting ring, and the conical block is clamped and adapted to the through hole. A positioning ring is fixedly connected to the inside of the annular groove, and the positioning ring is located inside the V-shaped ring, and a sealing ring is fixedly installed on the side of the connecting ring close to the V-shaped ring.

[0013] The present invention provides a full-flow guide flat gate valve with a limit function. It has the following beneficial effects:

[0014] 1. The full-flow guide flat gate valve with a limiting function moves to the horizontal plane of the slot through the limiting ring. Under the relative elastic force of the middle piece, one end of the limiting ring is located inside the slot. Through the clamping fit between the limiting ring and the slot, it can be effectively ensured that when the valve is in the fully open position, the circular hole of the valve plate and the hole axes of the connecting pipes on both sides of the valve body are in a straight line, that is, any cross section along the vertical line of the channel is an equal circular hole cross section.

[0015] 2. The fully-guiding flat gate valve with a limiting function, through the engagement between the protrusion and the groove, the left and right fixed plates will produce a certain guiding effect during the opening and closing process, making the operation more labor-saving. At the same time, the engagement of the teeth can also prevent the valve plate from sliding or deflecting during operation, thereby improving the efficiency and stability of the operation.

[0016] 3. The fully-guiding flat gate valve with a limiting function can accommodate a certain amount of particles through the gap between the teeth, reducing the direct damage of the particles to the sealing surface. At the same time, when the medium flow rate suddenly changes or an impact occurs, the fixed plates and the middle piece on the left and right parts can share the impact force together, reducing local stress concentration and reducing the risk of valve plate damage.

[0017] 4. This fully-guiding flat gate valve with a limiting function can provide a certain elastic pressure when the valve is closed by utilizing the elastic properties of the V-ring, so that the sealing rings on both sides fit tightly against the valve plate and the valve body, automatically compensating for gaps caused by manufacturing errors, wear or temperature changes, ensuring the reliability of the seal and effectively preventing medium leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the external structure of a full-flow guide flat gate valve with a limit function according to the present invention;

[0019] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the partial view structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of a half-section view of the valve body of the present invention;

[0022] Figure 5 This is a structural schematic diagram of the other side view of the half-section of the valve body of the present invention;

[0023] Figure 6 This is a schematic diagram of the valve plate structure of the present invention;

[0024] Figure 7 It is a schematic diagram of the local structure of the valve plate of the present invention;

[0025] Figure 8 It is a schematic diagram of the local structure of the valve plate of the present invention;

[0026] Fig. 9 This is a schematic diagram of the structure of the middleware of the present invention;

[0027] Fig.10 It is a schematic diagram of the structure of the sealing component of the present invention.

[0028] In the figure: 1. valve body; 11. shell; 12. connecting pipe; 13. side plate; 14. ring groove; 15. circular ring; 16. through hole; 17. slot; 18. drain outlet; 19. limit groove; 2. valve cover; 3. valve stem; 4. limit plate; 5. hand wheel; 6. sealing assembly; 61. connecting ring; 62. V-ring; 63. positioning ring; 64. tapered block; 65. sealing ring; 7. valve plate; 71. connecting block; 72. fixing plate; 73. connecting column; 74. limit ring; 75. protrusion; 76. middle piece; 761. positioning frame; 762. middle ring; 763. groove; 764. convex ring; 77. circular hole; 78. arc groove; 79. limit block; 710. spring. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0030] The first embodiment, as Figures 1 to 6 As shown, the present invention provides a technical solution: a full-flow guide flat gate valve with a limiting function, comprising a valve body 1, a valve cover 2 is fixedly installed on the top of the valve body 1, a limiting plate 4 is fixedly connected to the top of the valve cover 2, a valve stem 3 is arranged in the middle of the valve cover 2, the top of the valve stem 3 passes through the limiting plate 4, the limiting plate 4 is arranged in a trapezoidal shape, and a hand wheel 5 is limited to prevent the hand wheel 5 from rotating and driving the valve plate 7 downward to collide with the bottom of the valve body 1, and the bottom of the valve stem 3 extends to the inside of the valve body 1, and a hand wheel 5 is arranged on the outside of the valve stem 3, and the hand wheel 5 is threadedly connected to the valve stem 3;

[0031] The valve plate 7 is fixedly connected to the bottom of the valve stem 3, and the valve plate 7 is slidably connected to the valve body 1;

[0032] A sealing assembly 6, the sealing assembly 6 is fixedly installed inside the valve body 1, there are two sealing assemblies 6, and the two sealing assemblies 6 are symmetrically arranged with the valve plate 7 as the center;

[0033] The valve body 1 includes a shell 11, and a connecting pipe 12 is fixedly connected to the outer side of the shell 11. There are two connecting pipes 12, which are symmetrically arranged with the shell 11 as the center. The connecting pipes 12 are arranged vertically to the shell 11, and the connecting pipes 12 penetrate the shell 11 and extend to the inside. The staff rotates the hand wheel 5, and the hand wheel 5 is threadedly connected to the valve stem 3. By rotating the hand wheel 5, the valve stem 3 is driven to move up and down, thereby driving the valve plate 7 at the bottom of the valve stem 3 to move up and down along the vertical direction of the channel axis between the two side plates 13. When the driving hand wheel is rotated counterclockwise, the valve stem 3 is driven to move up and down. 5, the valve plate 7 connected with the valve stem 3 rises, the connecting pipe 12 channels on both sides of the valve plate 7 are opened, the valve is opened, and the fluid flows from the connecting pipe 12 on one side to the connecting pipe 12 on the other side. On the contrary, when the hand wheel 5 is turned clockwise, the valve plate 7 drops, the valve is closed, and the end of the connecting pipe 12 close to the valve plate 7 is fixedly connected with the side plate 13. There are two side plates 13, and a groove 17 is provided on the outer side of the side plate 13. A limiting groove 19 is provided on the outer side of the side plate 13. The groove 17 and the limiting groove 19 are respectively located on both sides of the valve plate 7, and the groove 17 is located above the limiting groove 19.

[0034] The valve plate 7 includes a connecting block 71, the top of the connecting block 71 is fixedly connected to the valve stem 3, the bottom of the connecting block 71 is fixedly connected to an intermediate piece 76, a fixing plate 72 is arranged on the outer side of the intermediate piece 76, there are two fixing plates 72, the two fixing plates 72 are symmetrically arranged with the intermediate piece 76 as the center, the fixing plate 72 is slidably connected to the connecting block 71, the side of the fixing plate 72 is fixedly connected to a connecting column 73, the outer side of the connecting column 73 is fixedly connected to a limiting ring 74, when the flat gate valve is in a closed state, the limiting ring 74 is located inside the limiting groove 19, and the limiting ring 74 is in an inclined state, the staff rotates the driving hand wheel 5 counterclockwise, the valve plate 7 connected to the valve stem 3 rises, at this time the limiting ring 74 moves vertically upward with the fixing plate 72, and the limiting ring 74 moves vertically upward with the fixing plate 72. When the valve is in the fully opened position, the limit ring 74 moves to the horizontal plane of the card slot 17, and the fixed plate 72 is under the relative elastic force of the intermediate piece 76, and one end of the limit ring 74 is located inside the card slot 17. Through the clamping fit between the limit ring 74 and the card slot 17, it can be effectively ensured that when the valve is in the fully opened position, the circular hole 77 of the valve plate 7 and the hole axis of the connecting pipes 12 on both sides of the valve body 1 are in a straight line, that is, any cross section along the vertical line of the channel is an equal circular hole cross section. When the limit ring 74 is located inside the limit slot 19, the valve can be fully closed, and the limit ring 74 is located inside the limit slot 19.

[0035] The second embodiment is based on the first embodiment. Figures 7 to 9 As shown, an annular groove 14 is provided on the inner wall of the side plate 13 near the connecting pipe 12, a circular ring 15 is fixedly connected to the inside of the annular groove 14, a through hole 16 is provided on the outside of the circular ring 15, and there are multiple through holes 16, which are evenly distributed with the circular ring 15 as the center, and a sewage outlet 18 is provided at the bottom of the shell 11.

[0036] The valve plate 7 is located at the middle interval of the two side plates 13, and the valve plate 7 is slidably connected to the two side plates 13. The fixing plate 72 is fixedly connected with a protrusion 75 near the outer side of the middle piece 76. The protrusion 75 is set as a triangle, and the protrusions 75 of the fixing plate 72 on both sides of the middle piece 76 are staggered. A circular hole 77 is opened on the outer side of the fixing plate 72. The diameter of the circular hole 77 is the same as the inner diameter of the connecting pipe 12. An arc groove 78 is opened on the outer side of the fixing plate 72. When the pressure increases, the pressure distribution between the toothed contact surfaces is more uniform, and the fixing plates 72 and the middle ring on the left and right parts will fit more closely together to enhance the sealing effect. By setting the protrusion 75 and the groove 763 between The left and right fixed plates 72 are meshed, and a certain guiding effect is produced during the opening and closing process, making the operation more labor-saving. At the same time, the engagement of the teeth can also prevent the valve plate from sliding or deflecting during operation, thereby improving the efficiency and stability of the operation. The arc groove 78 is located on the same axial direction as the connecting pipe 12, and the arc groove 78 is located above the circular hole 77. The side of the fixed plate 72 close to the middle piece 76 is fixedly connected to the limiting block 79, and the limiting block 79 and the arc groove 78 are located on the same axis. The fixed plate 72 is fixedly connected to the outer side of the limiting block 79 with a spring 710, and the spring 710 is set to a spiral cone, and the spring 710 is located on the fixed plate 72 away from the end of the limiting block 79.

[0037] The middle piece 76 includes a positioning frame 761, which is located at the middle interval between the two fixed plates 72. A convex ring 764 is fixedly connected to the outer side of the positioning frame 761. The side of the convex ring 764 away from the positioning frame 761 contacts the fixed plate 72. The outer wall of the positioning frame 761 is fixedly connected to the middle ring 762. When the staff closes the valve, the teeth between the fixed plates 72 on the left and right parts of the valve plate 7 and the middle piece 76 are engaged with each other to form multiple sealing lines. This multi-pass sealing structure greatly improves the sealing performance of the valve and can effectively prevent leakage of the medium, even if there is a slight sealing problem at individual teeth. , the other teeth can still play a sealing role to ensure the overall sealing performance. At the same time, for media containing particles or impurities, the toothed contact surface is relatively easier to adapt. The gap between the teeth can accommodate a certain amount of particles, reducing the direct damage of the particles to the sealing surface. At the same time, when the flow rate of the medium suddenly changes or an impact occurs, the left and right fixed plates 72 and the middle piece 76 can share the impact force together, reduce local stress concentration, and reduce the risk of damage to the valve plate 7. A groove 763 is provided on the side of the middle ring 762 close to the protrusion 75, and the grooves 763 on both sides of the middle ring 762 are slidably adapted to the protrusion 75 at intervals.

[0038] The third embodiment is based on the first and second embodiments. Fig.10As shown, the sealing assembly 6 includes a connecting ring 61, which is located inside the annular groove 14. A conical block 64 is fixedly connected to the outer edge of the connecting ring 61. The conical block 64 penetrates the connecting ring 61 and extends to the outside. A V-shaped ring 62 is arranged on the outer wall of the connecting ring 61. The V-shaped ring 62 is elastic. When the sealing assembly 6 is installed, the conical block 64 on the connecting ring 61 contacts and squeezes the circular ring 15. The conical block 64 is deformed by force, so that the conical block 64 is located inside the through hole 16. The connecting ring 61 is clamped to the inside of the annular groove 14. At this time, the sealing rings 65 on both sides of the connecting ring 61 contact the valve body 1 and the valve plate 7 respectively. By setting the V-ring 62 between the two sealing rings 65 and utilizing the elastic properties of the V-ring 62, a certain elastic pressure can be provided when the valve is closed, so that the sealing rings on both sides can fit tightly against the valve plate 7 and the valve body 1, and automatically compensate for the gap caused by manufacturing errors, wear or temperature changes, thereby ensuring the reliability of the seal and effectively preventing medium leakage. The V-ring 62 is rotatably connected to the connecting ring 61, and the conical block 64 is snap-fitted with the through hole 16. A positioning ring 63 is fixedly connected to the inside of the annular groove 14, and the positioning ring 63 is located inside the V-ring 62, and a sealing ring 65 is fixedly installed on the side of the connecting ring 61 close to the V-ring 62.

[0039] When in use, the staff turns the handwheel 5, which is threadedly connected to the valve stem 3. The valve stem 3 is driven up and down by turning the handwheel 5, thereby driving the valve plate 7 at the bottom of the valve stem 3 to move up and down along the vertical direction of the channel axis between the two side plates 13. When the handwheel 5 is driven counterclockwise, the valve plate 7 connected to the valve stem 3 rises, and the channels of the connecting pipes 12 on both sides of the valve plate 7 are opened, the valve is opened, and the fluid flows from the connecting pipe 12 on one side to the connecting pipe 12 on the other side. On the contrary, when the handwheel 5 is turned clockwise, the valve plate 7 drops and the valve is closed.

[0040] When the flat gate valve is in the closed state, the limit ring 74 is located inside the limit groove 19, and the limit ring 74 is in an inclined state. The staff rotates the driving hand wheel 5 counterclockwise, and the valve plate 7 connected to the valve stem 3 rises. At this time, the limit ring 74 moves vertically upward with the fixed plate 72, and there is extrusion between one side of the limit ring 74 and the limit groove 19, so that the fixed plates on the left and right sides move slightly, so that the limit ring 74 is in a vertical state and slides upward between the two side plates 13. When the valve is fully opened, the limit ring 74 moves to the horizontal plane of the card groove 17. Under the relative elastic force of the middle piece 76 of the fixed plate 72, one end of the limit ring 74 is located inside the card groove 17. Through the clamping cooperation between the limit ring 74 and the card groove 17, it can be effectively ensured that when the valve is in the fully open position, the circular hole 77 of the valve plate 7 and the hole axis of the connecting pipes 12 on both sides of the valve body 1 are on a straight line, that is, any cross section along the vertical line of the channel is an equal circular hole cross section. When the limit ring 74 is located inside the limit groove 19, the valve can be completely closed.

[0041] 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 ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A full-flow guide flat gate valve with a limit function, characterized in that: include: A valve body (1), a valve cover (2) is fixedly mounted on the top of the valve body (1), the top of the valve cover (2) is fixedly connected to a limit plate (4), a valve stem (3) is arranged in the middle of the valve cover (2), the top of the valve stem (3) passes through the limit plate (4), and the bottom of the valve stem (3) extends to the inside of the valve body (1), a hand wheel (5) is arranged on the outside of the valve stem (3), and the hand wheel (5) is threadedly connected to the valve stem (3); A valve plate (7), the valve plate (7) being fixedly connected to the bottom of the valve stem (3), and the valve plate (7) being slidably connected to the valve body (1); A sealing assembly (6), the sealing assembly (6) being fixedly mounted inside the valve body (1), the number of the sealing assemblies (6) being two, and the two sealing assemblies (6) being symmetrically arranged with the valve plate (7) as the center; The valve body (1) comprises a shell (11), a connecting pipe (12) is fixedly connected to the outer side of the shell (11), an end of the connecting pipe (12) close to the valve plate (7) is fixedly connected to a side plate (13), there are two side plates (13), a clamping groove (17) is provided on the outer side of the side plate (13), a limiting groove (19) is provided on the outer side of the side plate (13), the clamping groove (17) and the limiting groove (19) are respectively located on two sides of the valve plate (7), and the clamping groove (17) is located above the limiting groove (19); The valve plate (7) comprises a connecting block (71), the top of the connecting block (71) is fixedly connected to the valve stem (3), the bottom of the connecting block (71) is fixedly connected to an intermediate piece (76), a fixing plate (72) is arranged on the outer side of the intermediate piece (76), there are two fixing plates (72), the two fixing plates (72) are symmetrically arranged with the intermediate piece (76) as the center, the fixing plate (72) is slidably connected to the connecting block (71), the side of the fixing plate (72) is fixedly connected to a connecting column (73), the outer side of the connecting column (73) is fixedly connected to a limiting ring (74), and the limiting ring (74) is located inside the limiting groove (19); When the flat gate valve is in a closed state, the limit ring (74) is located inside the limit groove (19), and the limit ring (74) is in an inclined state. The staff rotates the driving hand wheel (5) counterclockwise, and the valve plate (7) connected to the valve stem (3) rises. At this time, the limit ring (74) moves vertically upward along with the fixed plate (72). One side of the limit ring (74) and the limit groove (19) are squeezed, so that the fixed plates (72) on the left and right sides move slightly, so that the limit ring (74) is in a vertical state and slides upward between the two side plates (13). When the valve is fully opened, the limit ring (74) moves to the horizontal plane of the groove (17). Under the relative elastic force of the middle piece (76), one end of the limit ring (74) is located inside the groove (17).

2. A full-flow guide flat gate valve with a limit function according to claim 1, characterized in that: There are two connecting pipes (12), the two connecting pipes (12) are symmetrically arranged with the shell (11) as the center, the connecting pipes (12) are arranged perpendicular to the shell (11), and the connecting pipes (12) penetrate the shell (11) and extend into the interior.

3. A full-flow guide flat gate valve with a limit function according to claim 2, characterized in that: The inner wall of the side plate (13) close to the connecting pipe (12) is provided with an annular groove (14), a circular ring (15) is fixedly connected to the inside of the annular groove (14), a through hole (16) is provided on the outside of the circular ring (15), there are a plurality of through holes (16), and the plurality of through holes (16) are evenly distributed around the circular ring (15), and a sewage outlet (18) is provided at the bottom of the shell (11).

4. A full-flow guide flat gate valve with a limit function according to claim 3, characterized in that: The valve plate (7) is located at the middle interval between the two side plates (13), and the valve plate (7) is slidably connected to the two side plates (13). The fixing plate (72) is fixedly connected with a protrusion (75) near the outer side of the middle piece (76).

5. A full-flow guide flat gate valve with a limit function according to claim 4, characterized in that: The protrusions (75) are triangular in shape, and the protrusions (75) on both sides of the fixing plate (72) are staggered, a circular hole (77) is provided on the outer side of the fixing plate (72), the diameter of the circular hole (77) is the same as the inner diameter of the connecting pipe (12), and an arc groove (78) is provided on the outer side of the fixing plate (72).

6. A full-flow guide flat gate valve with a limit function according to claim 5, characterized in that: The arc groove (78) and the connecting pipe (12) are located on the same axial direction, and the arc groove (78) is located above the circular hole (77); a side of the fixing plate (72) close to the middle piece (76) is fixedly connected to a limiting block (79); the limiting block (79) and the arc groove (78) are located on the same axis; a spring (710) is fixedly connected to the outer side of the fixing plate (72) close to the limiting block (79); the spring (710) is set to be a spiral cone; and the spring (710) is located on the fixing plate (72) at an end away from the limiting block (79).

7. A full-flow guide flat gate valve with a limit function according to claim 6, characterized in that: The middle piece (76) comprises a positioning frame (761), the positioning frame (761) is located at the middle interval between the two fixing plates (72), a convex ring (764) is fixedly connected to the outer side of the positioning frame (761), and the side of the convex ring (764) away from the positioning frame (761) is in contact with the fixing plate (72).

8. The full-flow guide flat gate valve with limit function according to claim 7, characterized in that: An intermediate ring (762) is fixedly connected to the outer wall of the positioning frame (761), and a groove (763) is provided on the side of the intermediate ring (762) close to the protrusion (75). The grooves (763) on both sides of the intermediate ring (762) are spaced and slidably adapted to the protrusion (75).

9. The full-flow guide flat gate valve with limit function according to claim 2, characterized in that: The sealing assembly (6) comprises a connecting ring (61), the connecting ring (61) being located inside the annular groove (14); a conical block (64) being fixedly connected to the outer edge of the connecting ring (61); the conical block (64) passing through the connecting ring (61) and extending to the outside; and a V-shaped ring (62) being provided on the outer wall of the connecting ring (61).

10. A full-flow guide flat gate valve with a limit function according to claim 9, characterized in that: The V-shaped ring (62) is rotatably connected to the connecting ring (61), the conical block (64) is snap-fitted with the through hole (16), a positioning ring (63) is fixedly connected to the inside of the annular groove (14), the positioning ring (63) is located inside the V-shaped ring (62), and a sealing ring (65) is fixedly installed on one side of the connecting ring (61) close to the V-shaped ring (62).

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