A bidirectional seal flat gate valve

Abstract

The application discloses a bidirectional sealing flat gate valve, and relates to the technical field of gate valves, which comprises a shell and a sealing mechanism, the sealing mechanism is arranged on the inner side of the shell, the sealing mechanism comprises first thickened inner rings, the first thickened inner rings are arranged on the inner side of the shell, the number of the first thickened inner rings is two, the two first thickened inner rings are respectively arranged on the inner sides of the left end and the right end of the shell, and finally, an outer sealing plate and a rubber sealing ring are synchronously tightly combined, the structure is characterized in that the outer sealing plate moves laterally and is transversely combined with the inner sealing plate in a step-by-step action, thereby replacing the synchronous combination and friction mode of a traditional sealing plate and two sealing rings on the two sides, reducing the wear of a sealing surface, avoiding the wear and damage of a sealing surface of a gate plate and a valve seat, reducing the maintenance and replacement cost of the gate valve, avoiding the sealing failure to interfere with the normal operation of a pipeline transportation system, and improving the continuity and safety of production.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, specifically a bidirectional sealing flat gate valve. Background Technology

[0002] A gate valve is a linear-stroke valve that opens or closes a pipeline by raising and lowering a gate perpendicular to the direction of fluid flow. Its core function is to cut off or connect the medium in the pipeline. It is widely used in industries such as petroleum, chemical, water supply and drainage, and power. During operation, the gate and the valve seat sealing surface are in planar contact. The gate moves up and down by the valve stem. When the gate is completely disengaged from the valve seat, the pipeline is fully open. When the gate is pressed against the valve seat, a sealing cut-off is achieved. According to the structure, it can be divided into wedge gate, parallel gate, etc. According to the driving method, there are manual, electric, pneumatic, hydraulic and other types. The advantages are low fluid resistance and reliable sealing performance. The disadvantages are poor regulating performance and long opening and closing time.

[0003] Flat gate valves are an important branch of gate valves. Their core feature is a flat gate. The pipeline is fully opened or fully closed by the raising and lowering of the gate perpendicular to the fluid direction. They are suitable for pipeline systems in oil, natural gas, water supply and drainage that require large diameter and low to medium-high pressure conditions. They are especially suitable for scenarios containing small amounts of particles or viscous media. During operation, the flat gate and the parallel sealing surface of the valve seat are in contact to cut off the flow. When fully open, the gate is completely removed from the flow channel, and the fluid flows in a straight line with minimal resistance loss. According to the sealing structure, they can be divided into single gate and double gate types. According to the driving method, they include manual, electric, and pneumatic types. Their significant advantages are compact structure, low flow resistance, small opening and closing torque, and less wear on the sealing surface. However, their regulating performance is poor. They are only suitable for shut-off and connection conditions and are not suitable for flow regulation. Also, it is necessary to avoid impurities in the medium from blocking the gate and affecting the sealing effect.

[0004] However, the existing bidirectional sealing flat gate valve has the following shortcomings:

[0005] Currently available bidirectional sealing flat gate valves require high accuracy in gate travel positioning due to the technical requirement of sealing on both sides. In actual opening and closing operations, the gate is prone to contact and friction with the valve seats on both sides. With long-term use, wear and damage to the sealing surfaces of the gate and valve seats frequently occur. This not only increases the maintenance and replacement costs of the gate valve, but also leads to media leakage and valve jamming due to sealing failure, thereby interfering with the normal operation of the pipeline transportation system and affecting the continuity and safety of industrial production.

[0006] Therefore, we propose a bidirectional sealing flat gate valve to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a bidirectional sealing flat gate valve. When the pipeline is fully closed, turning the valve causes the valve stem and threaded rod to rotate. The threaded rod moves downward through the threaded engagement of the sealing top plate, and then, through the rotational engagement of the bottom valve stem and the gate plate, it causes the gate plate to slide down. The sliding gate plate pushes the inner sealing plate to gradually fit against the bottom rubber sealing ring. During this process, the slider in the inner sealing plate groove is pushed tightly against the bottom of the groove by the second compression spring. The outer sealing plate, due to its lower position, first contacts the third thickened inner ring and is limited. The second compression spring is compressed and contracts, causing the inner and outer sealing plates to gradually overlap. In the initial stage of overlap, the bottom distance of the outer sealing plate is less than the distance of the rubber sealing ring, and there is a gap between it and the sealing ring. As the inner sealing plate continues to move downward, it pushes the outer sealing plate towards the bottom. With both sides spread out, the outer sealing plate and the sealing ring eventually seal synchronously. This step-by-step sealing action replaces the traditional synchronous contact friction method, reducing wear on the sealing surface, thereby avoiding seal failure, reducing maintenance costs, and ensuring the continuous and safe operation of the pipeline transportation system. After the gate valve is closed, the telescopic valve seat ring slides between the outer valve seat and the inner valve seat with the help of the first compression spring. Since the outer valve seat is fixed, the inner valve seat achieves elastic movement through the telescopic valve seat ring and the first compression spring. This structure can avoid hard friction between the sealing plate and the rubber sealing ring, improve the sealing adaptability, and prevent the sealing performance from decreasing after wear. At the same time, it forms a thermal compensation structure to compensate for the structural deformation caused by thermal expansion and contraction inside the gate valve, further ensuring the reliability of the seal and the stability of the equipment.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a bidirectional sealing flat gate valve, comprising a housing and a sealing mechanism, wherein the sealing mechanism is disposed on the inner side of the housing;

[0009] The sealing mechanism includes a first thickened inner ring, which is installed inside the outer shell. There are two first thickened inner rings, which are located on the inner sides of the left and right ends of the outer shell, respectively. An outer valve seat is provided inside the first thickened inner ring. A telescopic valve seat ring is slidably connected to the inner side of the outer valve seat. An inner valve seat is slidably connected to the outer side of the other end of the telescopic valve seat ring. Multiple first compression springs are provided inside the telescopic valve seat ring. Multiple spring holes are opened inside the outer valve seat. A valve seat groove is opened inside the inner valve seat. A rubber sealing ring is installed inside the valve seat groove.

[0010] Preferably, multiple first compression springs correspond to multiple spring holes respectively. The first compression springs are installed inside the spring holes. A second thickened inner ring is installed on the outer side of each of the two first thickened inner rings, and a third thickened inner ring is installed on the inner side of each of the two thickened inner rings.

[0011] Preferably, a sealing top plate is installed on the top of the outer shell, a sealing cylinder is installed on the top of the sealing top plate, a valve stem is provided on the inner side of the sealing cylinder, the top of the valve stem passes through the sealing cylinder and is equipped with a valve, a threaded rod is installed at the bottom of the valve stem, and the outer side of the threaded rod is threaded to the inner side of the sealing top plate.

[0012] Preferably, two gate slots are provided on the inner sides of the housing, and gate plates are slidably connected to the inner sides of the two gate slots. Another valve stem is provided at the bottom of the threaded rod, and the gate plate is rotatably connected to the threaded rod through the other valve stem.

[0013] Preferably, an inner sealing plate is installed at the bottom of the gate, and two sliding grooves are opened on the inner side of the inner sealing plate. A slider is slidably connected to the inner side of the sliding groove, and a second compression spring is installed on the top of the slider. The top of the second compression spring is installed on the top inner side of the sliding groove.

[0014] Preferably, both sides of the slider are provided with outer sealing plates, and the inner sides of the two outer sealing plates are provided with connecting holes, and the two ends of the slider are respectively installed inside the connecting holes.

[0015] Preferably, two slide chambers are provided on both sides of the inner sealing plate, and strip chambers are provided on both sides of the interior of the slide chambers.

[0016] Preferably, a sliding strip is installed on the inner side of the outer sealing plate, and a limiting strip is installed on both sides of the sliding strip.

[0017] Preferably, the slide bar is slidably connected to the inside of the slide chamber, and the limiting bar is slidably connected to the inside of the slide chamber.

[0018] Preferably, a thickened convex plate is installed on the outer side of the outer sealing plate. The outer side of the thickened convex plate is an arc-shaped surface that is thin at the edges and thick in the middle. The inner sealing plate is a circular plate with a top thickness greater than the bottom thickness and a radial cross-section that is an inverted isosceles trapezoid. Symmetrical slopes extending downward along its axis are formed on both sides of the plate. The slopes of the plate correspond to the inner slopes of the outer sealing plate. The outer side of the outer sealing plate is a vertical plane, and the inner side of the slide is parallel to the slopes on both sides of the inner sealing plate.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. When using this flat gate valve to perform a full-closure operation on a pipeline, turning the valve causes the valve stem and threaded rod to rotate. The threaded rod moves downward through its threaded engagement with the sealing top plate, and then, through the rotational engagement of the other valve stem at the bottom with the gate plate, it causes the gate plate to slide down within the gate groove. The sliding gate plate pushes the inner sealing plate downward, gradually aligning it with the bottom rubber sealing ring. During this process, the slider in the inner sealing plate groove is pressed tightly against the bottom of the groove by the force of the second compression spring. The outer sealing plate on the slider, being located slightly below and outside the inner sealing plate, first contacts the third thickened inner ring and is limited. The second compression spring is compressed and contracts, causing the inner sealing plate and the outer sealing plate to gradually overlap to achieve a full-closure seal. In the initial stage of overlap, the distance between the bottom outer sides of the outer sealing plate is smaller than the distance between the rubber sealing rings. When it contacts the third thickened inner ring, there is a gap between it and the sealing ring. After the outer sealing plate stops moving, the inner sealing plate continues to move downward and spreads to both sides. Finally, the outer sealing plate and the rubber sealing ring are synchronously sealed. This structure replaces the traditional method of synchronous contact and friction between the sealing plate and the sealing rings on both sides by the step-by-step action of the lateral movement of the outer sealing plate and the lateral sealing of the inner sealing plate. This reduces the wear of the sealing surface, thereby avoiding the problem of wear and damage to the sealing surface of the gate and the valve seat, reducing the maintenance and replacement cost of the gate valve, avoiding the interference of sealing failure with the normal operation of the pipeline transportation system, and improving the continuity and safety of production.

[0021] 2. After the gate valve is closed, the telescopic valve seat ring slides between the outer valve seat and the inner valve seat with the help of the first compression spring. Since the outer valve seat is fixed, the inner valve seat moves elastically through the telescopic valve seat ring and the first compression spring. This structure can avoid hard friction between the sealing plate and the rubber sealing ring, improve the sealing adaptability and prevent the sealing performance from decreasing after wear. At the same time, it forms a thermal compensation structure to compensate for the structural deformation caused by thermal expansion and contraction inside the gate valve. Attached Figure Description

[0022] Figure 1 This is a perspective view of the main structure of a bidirectional sealing flat gate valve according to the present invention;

[0023] Figure 2 This is a three-dimensional, exploded view of the structure of a bidirectional sealing flat gate valve according to the present invention.

[0024] Figure 3 This is a diagram showing the positions of the components of a bidirectional sealing flat gate valve according to the present invention;

[0025] Figure 4 This is a split perspective view of the sealing mechanism in a bidirectional sealing flat gate valve according to the present invention;

[0026] Figure 5 This is a partially disassembled perspective view of the sealing mechanism in a bidirectional sealing flat gate valve according to the present invention;

[0027] Figure 6 for Figure 5 Enlarged view of point A in the image;

[0028] Figure 7 This is a split perspective view of another part of the sealing mechanism in a bidirectional sealing flat gate valve according to the present invention;

[0029] Figure 8 for Figure 7 Enlarged view of point B in the image.

[0030] In the diagram: 1. Outer shell; 2. Sealing mechanism; 201. First thickened inner ring; 202. Outer valve seat; 203. Telescopic valve seat ring; 204. Inner valve seat; 205. First compression spring; 206. Valve seat groove; 207. Spring hole; 208. Rubber sealing ring; 209. Second thickened inner ring; 210. Third thickened inner ring; 211. Sealing top plate; 212. Sealing cylinder; 213. Valve stem; 214. Threaded rod; 215. Gate; 216. Gate groove; 217. Inner sealing plate; 218. Slide groove; 219. Slider; 220. Second compression spring; 221. Outer sealing plate; 222. Connecting hole; 223. Slide bar; 224. Limiting bar; 225. Slide chamber; 226. Slide chamber; 227. Thickened convex plate; 228. Valve. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0032] Example 1, according to Figure 1 - Figure 4As shown, a bidirectional sealing flat gate valve includes a housing 1 and a sealing mechanism 2. The sealing mechanism 2 is located inside the housing 1 and includes two first thickened inner rings 201. The two first thickened inner rings 201 are located inside the housing 1 at the left and right ends of the housing 1, respectively. An outer valve seat 202 is provided inside the first thickened inner ring 201. A telescopic valve seat ring 203 is slidably connected to the inner side of the outer valve seat 202. An inner valve seat 204 is slidably connected to the outer side of the other end of the telescopic valve seat ring 203. A plurality of first compression springs 205 are provided inside the telescopic valve seat ring 203. A plurality of spring holes 207 are opened inside the outer valve seat 202. A plurality of spring holes 207 are opened inside the inner valve seat 204. There is a valve seat groove 206, and a rubber sealing ring 208 is installed on the inner side of the valve seat groove 206. Multiple first compression springs 205 correspond to multiple spring holes 207 respectively. The first compression springs 205 are installed on the inner side of the spring holes 207. A second thickened inner ring 209 is installed on the outer side of each of the two first thickened inner rings 201. A third thickened inner ring 210 is installed on the inner side of the two thickened inner rings. A sealing top plate 211 is installed on the top of the outer shell 1. A sealing cylinder 212 is installed on the top of the sealing top plate 211. A valve stem 213 is provided on the inner side of the sealing cylinder 212. The top of the valve stem 213 passes through the sealing cylinder 212 and is equipped with a valve 228. A threaded rod 214 is installed on the bottom of the valve stem 213. The outer side of the threaded rod 214 is threaded to the inner side of the sealing top plate 211.

[0033] The overall effect of Embodiment 1 is as follows: After the gate valve is closed, the telescopic valve seat ring 203 slides between the outer valve seat 202 and the inner valve seat 204 via the first compression spring 205. Since the outer valve seat 202 is in a fixed state, the inner valve seat 204 achieves elastic movement on the outer valve seat 202 via the telescopic valve seat ring 203 and the first compression spring 205. This structure further avoids hard friction between the sealing plate and the rubber sealing ring 208, while improving the sealing adaptability of the rubber sealing ring 208 to the sealing plate, preventing the sealing performance from decreasing after the sealing surface is worn. At the same time, it forms a thermal compensation structure to simultaneously compensate for the structural deformation caused by thermal expansion and contraction inside the gate valve. Among them, the outer sides of the two first thickened inner rings 201 are each equipped with a second thickened inner ring 209, and the inner side is equipped with a third thickened inner ring 210, forming a multi-stage thickened inner ring structure. The third thickened inner ring 210 is used to precisely limit the outer sealing plate 221, while the second thickened inner ring 209 provides support for the third thickened inner ring 210 to avoid limiting the position. Due to concentrated stress, the inner ring deforms. This design improves the structural strength and positioning stability of the sealing mechanism 2. Sliding chambers 225 are opened on both sides of the inner sealing plate 217, and strip chambers 226 are opened on both sides inside the sliding chambers 225. The sliding strip 223 on the inner side of the outer sealing plate 221 is slidably connected to the sliding chamber 225, and the limiting strips 224 on both sides of the sliding strip 223 are slidably connected to the strip chambers 226. This dual guiding structure ensures that the outer sealing plate 221 can only move in a preset direction, avoiding jamming or offset during the sealing process and improving the accuracy of the sealing action. The thickened convex plate 227 on the outer side of the outer sealing plate 221 is thin at the edges and thick in the middle. The curved surface reduces frictional resistance during initial contact with the rubber sealing ring 208, while the vertical plane ensures effective surface contact during sealing. Simultaneously, the added curved surface thickens the overall thickness of the outer sealing plate 221, increasing its ability to withstand internal pressure. When the inner sealing plate 217 moves the outer sealing plate 221 downwards, the outer sealing plate 221, located slightly below and outside the inner sealing plate 217, first contacts the third thickened inner ring 210 for limiting its position. Then, the second compression spring 220 contracts, causing the inner sealing plate 217 to overlap with the outer sealing plate 221. Finally, the inner sealing plate 217 moves downwards, pushing the outer sealing plate 221 apart to the sides to contact the rubber sealing ring 208. The sealing ring 208 is tightly sealed. This step-by-step action replaces the traditional synchronous friction method of sealing plates, fundamentally reducing wear on the sealing surface. The inner sealing plate 217 adopts a circular plate structure that is thick at the top and thin at the bottom. Its radial cross-section is an inverted isosceles trapezoid, forming symmetrical sloping surfaces on both sides. The sloping surfaces correspond to the inner sloping surfaces of the outer sealing plate 221. At the same time, the inner side of the slide 225 is parallel to the sloping surfaces on both sides of the inner sealing plate 217. The inner slide strip 223 of the outer sealing plate 221 slides and engages with the slide 225. Thus, the directional opening action of the sealing plate is achieved through geometric adaptation, ensuring the synchronicity and sealing of the movement of the outer sealing plate 221 to both sides.

[0034] Example 2, according to Figure 4 - Figure 8As shown, two gate slots 216 are installed on both sides of the inner side of the outer casing 1. A gate plate 215 is slidably connected to the inner side of the two gate slots 216. Another valve stem 213 is installed at the bottom of the threaded rod 214. The gate plate 215 is rotatably connected to the threaded rod 214 through the other valve stem 213. An inner sealing plate 217 is installed at the bottom of the gate plate 215. Two sliding grooves 218 are opened on the inner side of the inner sealing plate 217. A slider 219 is slidably connected to the inner side of the sliding grooves 218. A second compression spring 220 is installed on the top of the slider 219. The top of the second compression spring 220 is installed on the top inner side of the sliding groove 218. An outer sealing plate 221 is provided on both sides of the slider 219. A connecting hole 222 is opened on the inner side of the two outer sealing plates 221. The two ends of the slider 219 are respectively installed on the inner side of the connecting hole 222. An inner sealing plate 217 is provided on both sides of the inner sealing plate 217. There are two slide chambers 225. Each slide chamber 225 has a strip chamber 226 on both sides inside. A slide strip 223 is installed on the inner side of the outer sealing plate 221. A limiting strip 224 is installed on both sides of the slide strip 223. The slide strip 223 is slidably connected to the inner side of the slide chamber 225, and the limiting strip 224 is slidably connected to the inner side of the strip chamber 226. A thickened convex plate 227 is installed on the outer side of the outer sealing plate 221. The outer side of the thickened convex plate 227 is an arc-shaped surface that is thin at the edges and thick in the middle. The inner sealing plate 217 is a circular plate with a top thickness greater than the bottom thickness and an inverted isosceles trapezoidal radial cross section. Symmetrical slope surfaces extending downward along its axis are formed on both sides of the plate. The slope surfaces correspond to the inner slope surfaces of the outer sealing plate 221. The outer side of the outer sealing plate 221 is a vertical plane. The inner side of the slide chamber 225 is parallel to the slope surfaces on both sides of the inner sealing plate 217.

[0035] The overall effect of Embodiment 2 is as follows: When the flat gate valve is used to perform a full closure operation on the pipeline, turning the valve 228 causes the valve stem 213 and threaded rod 214 to rotate. The rotating threaded rod 214, through its threaded engagement with the sealing top plate 211, causes the valve stem 213 and threaded rod 214 to move downwards during rotation. The rotating threaded rod 214, through its bottom valve stem 213 and the rotating engagement with the gate plate 215, causes the gate plate 215 to slide downwards within the gate groove 216. The downwardly moving gate plate 215 pushes... The inner sealing plate 217 moves downward, gradually aligning itself with the bottom rubber sealing ring 208. During this process, the slider 219 within the inner groove 218 of the inner sealing plate 217 is pressed tightly against the bottom of the groove 218 by the pushing force of the top second compression spring 220. The two outer sealing plates 221 on the slider 219 are located slightly below the outer side of the inner sealing plate 217. Therefore, the outer sealing plates 221 contact the third thickened inner ring 210 before the inner sealing plate 217. After the third thickened inner ring 210 limits the outer sealing plate 221, The second compression spring 220 is compressed by the interaction force between the top gate plate 215 and the bottom outer sealing plate 221, causing the inner sealing plate 217 to gradually overlap with the outer sealing plate 221, achieving a full seal of the pipeline. During the overlap process of the inner sealing plate 217 and the outer sealing plate 221, due to the fit between their shapes, in the initial stage of overlap, the distance between the bottom outer sides of the outer sealing plate 221 on both sides of the inner sealing plate 217 is less than the distance between the two rubber sealing rings 208. When the outer sealing plate 221 contacts the third thickened inner ring 210, its sides are in contact with the rubber sealing rings 208. There is a gap in the sealing ring 208. After the outer sealing plate 221 stops moving, the inner sealing plate 217 continues to move downward and pushes the outer sealing plate 221 to both sides. The outer sealing plates 221 on both sides move to both sides simultaneously. When the inner sealing plate 217 and the outer sealing plate 221 are completely overlapped, the outer sealing plate 221 and the rubber sealing ring 208 are simultaneously sealed. The step-by-step action of the outer sealing plate 221 moving to both sides and sealing laterally with the inner sealing plate 217 replaces the traditional method of the sealing plate simultaneously rubbing against the rubber sealing rings 208 on both sides.

[0036] The working principle of the entire device is as follows: When using this flat gate valve to fully close the pipeline, turning the valve 228 causes the valve stem 213 and threaded rod 214 to rotate. The rotating threaded rod 214, through its threaded relationship with the sealing top plate 211, causes the valve stem 213 and threaded rod 214 to move downwards during rotation. During this rotational movement, the threaded rod 214, through the rotation between its bottom valve stem 213 and the gate plate 215, causes the gate plate 215 to slide downwards within the gate groove 216. The downwardly moving gate plate 215 pushes the inner sealing plate 216 used for sealing. 17 moves downwards, causing the inner sealing plate 217 to overlap with the bottom rubber sealing ring 208. During this process, the slider 219 in the inner groove 218 of the inner sealing plate 217 is in a state of being pressed tightly against the bottom of the groove 218 by the pushing force of the second compression spring 220 at its top. At this time, the two outer sealing plates 221 on the slider 219 are located on the outer side and slightly below the inner sealing plate 217, so that the outer sealing plates 221 contact the third thickened inner ring 210 before the inner sealing plate 217. At this time, because the third thickened inner ring 210 limits the outer sealing plate 221, the second compression spring 220 is subjected to The interaction force between the top gate 215 and the bottom outer sealing plate 221 causes the second compression spring 220 to be compressed, thereby causing the inner sealing plate 217 to gradually overlap with the outer sealing plate 221, thus achieving a complete seal on the pipeline. During the overlap of the inner sealing plate 217 and the outer sealing plate 221, due to the shapes of the inner sealing plate 217 and the outer sealing plate 221, in the initial stage of overlap, the bottom outer distance of the outer sealing plate 221, which is located slightly lower on both sides of the inner sealing plate 217, is less than the distance between the two rubber sealing rings 208. When the outer sealing plate 221 contacts the third thickened inner ring 210, there is a certain distance between its two sides and the rubber sealing ring 208. When the outer sealing plate 221 stops moving and the inner sealing plate 217 moves downward, it pushes the outer sealing plate 221 open to both sides. At this time, the outer sealing plates 221 on both sides move to the sides respectively. When the inner sealing plate 217 overlaps with the outer sealing plate 221, the outer sealing plate 221 and the rubber sealing ring 208 are simultaneously sealed. In this way, the lateral sealing action of the outer sealing plate 221 moving to both sides and sealing the inner sealing plate 217 replaces the sealing plate's simultaneous contact and friction with the rubber sealing rings 208 on both sides.

[0037] After the gate valve is closed, the telescopic valve seat ring 203 slides between the outer valve seat 202 and the inner valve seat 204 via the first compression spring 205. Since the outer valve seat 202 is in a fixed state, the inner valve seat 204 moves elastically on the outer valve seat 202 via the telescopic valve seat ring 203 and the first compression spring 205. This further avoids the problem of hard friction between the sealing plate and the rubber sealing ring 208. At the same time, this method improves the sealing adaptability of the rubber sealing ring 208 to the sealing plate, avoids the problem of reduced sealing performance after wear, and simultaneously avoids the problem of thermal expansion and contraction inside the gate valve.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bidirectional sealing flat gate valve, characterized in that: It includes a housing (1) and a sealing mechanism (2), the sealing mechanism (2) being disposed inside the housing (1); The sealing mechanism (2) includes a first thickened inner ring (201), which is installed on the inner side of the outer shell (1). There are two first thickened inner rings (201), which are located on the inner sides of the left and right ends of the outer shell (1). An outer valve seat (202) is provided on the inner side of the first thickened inner ring (201). A telescopic valve seat ring (203) is slidably connected to the inner side of the outer valve seat (202). An inner valve seat (204) is slidably connected to the outer side of the other end of the telescopic valve seat ring (203). A plurality of first compression springs (205) are provided on the inner side of the telescopic valve seat ring (203). A plurality of spring holes (207) are opened on the inner side of the outer valve seat (202). A valve seat groove is opened on the inner side of the inner valve seat (204). (206) A rubber sealing ring (208) is installed on the inner side of the valve seat groove (206). A plurality of first compression springs (205) correspond to a plurality of spring holes (207) respectively. The first compression springs (205) are installed on the inner side of the spring holes (207). A second thickened inner ring (209) is installed on the outer side of the two first thickened inner rings (201). A third thickened inner ring (210) is installed on the inner side of the two second thickened inner rings (209). Two gate slots (216) are installed on the inner sides of the outer shell (1). A gate plate (215) is slidably connected to the inner side of the two gate slots (216). Another valve rod (213) is installed at the bottom of the threaded rod (214). The gate plate (215) is rotatably connected to the threaded rod (214) through the other valve rod.

2. The bidirectional sealing flat gate valve according to claim 1, characterized in that: A sealing top plate (211) is installed on the top of the outer shell (1). A sealing cylinder (212) is installed on the top of the sealing top plate (211). A valve stem (213) is provided on the inner side of the sealing cylinder (212). The top of the valve stem (213) passes through the sealing cylinder (212) and is equipped with a valve (228). A threaded rod (214) is installed at the bottom of the valve stem (213). The outer side of the threaded rod (214) is threaded to the inner side of the sealing top plate (211).

3. The bidirectional sealing flat gate valve according to claim 2, characterized in that: The bottom of the gate (215) is provided with an inner sealing plate (217). Two sliding grooves (218) are opened on the inner side of the inner sealing plate (217). A slider (219) is slidably connected to the inner side of the sliding groove (218). A second compression spring (220) is installed on the top of the slider (219). The top of the second compression spring (220) is installed on the inner side of the top of the sliding groove (218).

4. The bidirectional sealing flat gate valve according to claim 3, characterized in that: Both sides of the slider (219) are provided with outer sealing plates (221), and the inner sides of the two outer sealing plates (221) are provided with connecting holes (222). The two ends of the slider (219) are respectively installed on the inner side of the connecting holes (222).

5. The bidirectional sealing flat gate valve according to claim 4, characterized in that: Two slide chambers (225) are provided on both sides of the inner sealing plate (217), and strip chambers (226) are provided on both sides of the interior of the slide chambers (225).

6. The bidirectional sealing flat gate valve according to claim 5, characterized in that: A slide bar (223) is installed on the inner side of the outer sealing plate (221), and a limiting strip (224) is installed on both sides of the slide bar (223).

7. The bidirectional sealing flat gate valve according to claim 6, characterized in that: The slide bar (223) is slidably connected to the inside of the slide chamber (225), and the limiting bar (224) is slidably connected to the inside of the bar chamber (226).

8. The bidirectional sealing flat gate valve according to claim 6, characterized in that: The outer sealing plate (221) is provided with a thickened convex plate (227) on its outer side. The outer side of the thickened convex plate (227) is an arc-shaped surface that is thin at the edges and thick in the middle. The inner sealing plate (217) is a circular plate with a top thickness greater than the bottom thickness and an inverted isosceles trapezoidal radial cross section. Symmetrical slope surfaces extending downward along its axis are formed on both sides of the plate. The slope surfaces correspond to the inner slope surfaces of the outer sealing plate (221). The outer side of the outer sealing plate (221) is a vertical plane. The inner side of the slide (225) is parallel to the slope surfaces on both sides of the inner sealing plate (217).

Images