A gate valve with variable height

Abstract

The present invention proposes a height-variable gate valve, comprising a vertically arranged frame, a valve plate that can slide up and down is provided in the frame, a top seat is provided at the upper end of the frame, a base is provided at the upper end of the valve plate, and a valve stem is provided, the valve stem is rotatably connected to the top seat, and the valve stem is threadedly connected to the base. The frame comprises an upper frame and a lower frame arranged up and down, the upper frame and the lower frame are hinged; the lower side of the base is hinged to the valve plate; when the valve plate is in a closed state, the valve plate moves into the lower frame, the hinge axis of the base and the hinge axis of the upper frame are coaxial, and the upper frame can be rotated and laid down at this time; when the valve plate is in an open state, the valve plate moves into the upper frame, and the upper frame can be rotated and laid down at this time. The frame is composed of an upper frame and a lower frame, wherein the upper frame can be rotated and laid down, so that the problem of a higher upper frame standing vertically will not occur, thereby solving the various problems caused by the higher upper frame standing vertically as described in the background art.

Description

Technical Field

[0001] The present invention relates to the technical field of gate valves, and in particular to a gate valve with variable height. Background Art

[0002] The flat gate valve is a common valve type. It includes a valve body, a gate, a valve stem, and an operating mechanism.

[0003] Among them, the valve body is usually made of steel, iron and other materials. It is the main part of the valve, providing a fluid channel and a basis for installing other components. The gate is a key component of the flat gate valve and is generally made of metal. It is flat in shape and realizes the opening and closing of the valve. The valve stem connects the gate and the operating mechanism and is used to transmit the operating force to move the gate up and down. The valve stem is usually made of high-strength metal materials and has sufficient strength and rigidity to withstand various forces during the operation of the valve. The operating mechanism is used to control the opening and closing of the valve. Common operating mechanisms include manual operating mechanisms (such as handwheels, handles, etc.), electric operating mechanisms and pneumatic operating mechanisms. The operating mechanism rotates the valve stem to raise or lower the gate, thereby realizing the opening and closing action of the valve.

[0004] Patent application publication number CN 102720850 A discloses a manual flat gate valve. Figure 1 As shown, it includes a frame, valve plate, screw, base, top seat, and handwheel. The valve plate is installed in the frame. The bottom end of the screw is fixedly connected to the valve plate through the base, and the top end is fixedly connected to the handwheel through the top seat. By turning the handwheel, the screw and valve plate are driven to reciprocate vertically within the frame, achieving the purpose of opening and closing the valve.

[0005] When the height of the frame and valve plate is relatively high, such as Figure 1 The stacking height of two or three flat gate valves. When this taller flat gate valve is installed in a canal, half of its height will be exposed on the upper side of the canal. Even if only half of the height is exposed, it will appear very high, which will cause various problems:

[0006] Affecting the appearance: Since half of the flat gate valve's height is exposed on the upper side of the canal, even if only half is exposed, it will appear very high, which to some extent affects the aesthetics of the surrounding environment. Especially in areas with high landscape requirements, such as parks and scenic spots, valves that are too high may destroy the overall visual effect.

[0007] Large space occupation: Taller slab gate valves take up more vertical space and may interfere with surrounding buildings, facilities, etc. In areas with limited space, this may cause inconvenience in installation and use, and may even require the surrounding environment to be modified to accommodate the height of the valve.

[0008] Safety hazard: The part exposed on the upper side of the canal is relatively high, which may pose a safety hazard to pedestrians and vehicles passing by. For example, pedestrians may accidentally bump into the valve, and vehicles may collide with the valve due to obstructed vision while driving.

[0009] Stability issues: Higher valves may generate greater forces under the impact of water flow, which places higher demands on valve stability. If the valve is not firmly fixed, it may shake or tilt under the action of water flow, affecting the normal use and sealing of the valve.

[0010] Increased load: When wind blows, the higher part exposed to the upper side of the channel will be affected by the wind force, which will bring additional load to the valve. This may affect the stability of the valve, especially in windy weather, where wind resistance may cause the valve to shake or move. Summary of the Invention

[0011] In response to the problems pointed out in the background technology, the present invention proposes a gate valve with variable height to solve the above technical problems.

[0012] The technical solution of the present invention is achieved as follows:

[0013] A height-variable gate valve comprises a vertically arranged frame, a valve plate which can slide up and down is arranged in the frame, a top seat is arranged at the upper end of the frame, a base is arranged at the upper end of the valve plate, and a valve stem is rotatably connected to the top seat, and the valve stem is threadedly connected to the base.

[0014] The frame comprises an upper frame and a lower frame arranged up and down, and the upper frame is hinged to the lower frame;

[0015] The lower side of the base is hinged to the valve plate;

[0016] When the valve plate is in the closed state, the valve plate moves into the lower frame, the hinge axis of the base and the hinge axis of the upper frame are coaxial, and the upper frame can be rotated and laid down;

[0017] When the valve plate is in an open state, the valve plate moves into the upper frame, and the upper frame can be rotated and laid down.

[0018] The present invention is further configured to further include a positioning device, which can position and fix the upper frame in a vertical state.

[0019] The present invention is further configured such that the positioning device includes positioning rods respectively arranged on the upper frame and the lower frame, and also includes a positioning bar, both ends of the positioning bar are respectively provided with positioning holes corresponding to the positioning rods, the positioning rods are connected to the positioning holes, a nut is threadedly connected to the positioning rods, and positioning devices are respectively provided on the left and right sides of the frame.

[0020] The present invention is further configured such that the upper frame is a U-shaped structure with an opening facing downward, and the lower frame is a U-shaped structure with an opening facing upward.

[0021] The present invention is further configured such that slide grooves are respectively provided on the inner sides of the left and right arms of the upper frame and the lower frame, the slide grooves on the upper frame and the lower frame correspond to each other and are connected, and the valve plate is slidably connected to the slide grooves.

[0022] The present invention is further configured such that when the valve plate is in a closed state, the lower end of the valve stem is arranged higher than the hinge axis of the base.

[0023] The present invention is further configured such that support rods are respectively provided on the left and right sides of the upper end of the upper frame.

[0024] The present invention is further configured such that the valve plate includes an upper plate body and a lower plate body arranged one above the other, and also includes a flexible plate body with the same shape as the valve plate, and the flexible plate body is fixedly connected to the upper plate body and the lower plate body.

[0025] The present invention is further configured such that the valve plate is composed of a plurality of sub-plate bodies arranged in an up-down direction, and further comprises a flexible plate body having the same shape as the valve plate, wherein the flexible plate body is fixedly connected to the sub-plate bodies.

[0026] The present invention is further configured such that the upper end of the valve stem is connected to a hand wheel.

[0027] By adopting the above technical solution, the beneficial effects of the present invention are:

[0028] The height-variable gate valve provided by the present invention has a frame consisting of an upper frame and a lower frame, wherein the upper frame can be rotated and laid down, so that the problem of the higher upper frame standing vertically will not occur, thereby solving the various problems caused by the higher upper frame standing vertically as described in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural diagram of the prior art.

[0031] Figure 2 This is a structural diagram of the valve plate of the present invention in a closed state.

[0032] Figure 3This is a structural diagram of the valve plate of the present invention in an open state.

[0033] Figure 4 It is a side view of the present invention.

[0034] Figure 5 This is a structural diagram of the upper frame of the present invention in a folded-down state.

[0035] Figure 6 It is a structural schematic diagram of the upper plate body and the plate body of the valve plate of the present invention.

[0036] Figure 7 It is a side view of the upper plate body and the plate body of the valve plate of the present invention.

[0037] Figure 8 It is a structural schematic diagram of the upper plate and the bent plate of the present invention.

[0038] Figure 9 This is a structural schematic diagram of the valve plate of the present invention consisting of sub-plate bodies.

[0039] Figure 10 This is a side view of the valve plate of the present invention consisting of sub-plate bodies. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] Reference as follows Figure 1-10 The present invention will be described:

[0042] Example: A height-adjustable gate valve includes a vertically mounted frame that provides support and mounting for the entire valve. A valve plate 1 is mounted within the frame, sliding vertically. The upward and downward movement of the valve plate 1 controls the opening and closing of the valve. When the valve plate 1 moves upward, the valve opens, allowing fluid to pass through. When the valve plate 1 moves downward and securely engages the frame, the valve closes, preventing fluid from flowing. A top seat 2 is located at the upper end of the frame, and a base 3 is located at the upper end of the valve plate 1. The valve stem 4 is also included. The valve stem 4 is rotatably connected to the top seat 2 and threadedly connected to the base 3. A handwheel 15 is connected to the upper end of the valve stem 4. Turning the handwheel 15 drives the valve plate 1 up and down within the frame. The valve stem 4 is a key operating component of the flat gate valve. Its rotatable connection to the top seat 2 allows it to rotate freely within the top seat 2. Furthermore, the valve stem 4 is threadedly connected to the base 3. When the valve stem 4 rotates, the threads cause it to move up and down relative to the base 3. The upper end of the valve stem 4 is connected to the handwheel 15. By turning the hand wheel 15, the valve stem 4 can be driven to rotate. Due to the threaded connection between the valve stem 4 and the base 3 and the rotational connection with the top seat 2, the rotation of the valve stem 4 is converted into the up and down movement of the valve plate 1 in the frame.

[0043] The top end of the frame is provided with a top seat 2, and the top end of the valve plate 1 is provided with a base 3. The valve stem 4 is rotatably connected to the top seat 2 via a bearing. The outer ring of the bearing is fixedly connected to the top seat 2. The valve stem 4 passes through the bearing and is fixedly connected to the inner ring of the bearing. The valve stem 4 is threadedly connected to the base 3. The top seat 2 has a hole for installing the bearing, and the base 3 has a threaded hole for connecting the valve stem 4. The hole in the top seat 2 is used to install the bearing. This design allows the valve stem 4 to rotatably connect to the top seat 2 via the bearing. The outer ring of the bearing is fixedly connected to the top seat 2, ensuring the stability of the bearing on the top seat 2. The valve stem 4 passes through the bearing and is fixedly connected to the inner ring of the bearing. When the valve stem 4 rotates, the inner ring of the bearing rotates synchronously with the valve stem 4, while the outer ring of the bearing remains fixed to the top seat 2. This allows the valve stem 4 to rotate smoothly on the top seat 2, reducing friction during rotation and improving operation smoothness and efficiency. The base 3 has a threaded hole, and the valve stem 4 and base 3 are threadedly connected. When the valve stem 4 rotates, due to the action of the thread, the valve stem 4 will move up and down relative to the base 3. This threaded connection method allows the rotational movement of the valve stem 4 to be converted into the up and down linear movement of the valve plate 1 within the frame, thereby realizing the opening and closing operation of the valve.

[0044] The frame includes an upper frame 5 and a lower frame 6. The upper frame 5 is a U-shaped structure with an opening facing downward, and the lower frame 6 is a U-shaped structure with an opening facing upward. This U-shaped design has certain structural advantages. On the one hand, it can provide suitable installation space and sliding tracks for the valve plate 1, and on the other hand, it also makes the structure of the entire frame more stable and strong.

[0045] The upper frame 5 is hinged to the lower frame 6. The two ends of the lower side of the upper frame 5 and the two ends of the upper side of the upper frame 5 are respectively hinged by hinges. When in use, the frame is vertically installed in the ditch, the lower frame 6 is located in the ditch, and the upper frame 5 is located above the ditch. The above arrangement allows the upper frame 5 to be rotated and laid down, so that there will be no problem of the higher upper frame 5 standing vertically. The upper frame 5 and the lower frame 6 are connected in a hinged manner. Specifically, the two ends of the lower side of the upper frame 5 and the two ends of the upper side of the upper frame 5 are respectively hinged by hinges. This hinged design allows the upper frame 5 to be rotatable. In actual use, the upper frame 5 can be rotated and laid down.

[0046] When the frame is installed vertically in the ditch, the lower frame 6 is located inside the ditch, supporting and securing the entire valve. The U-shaped structure of the lower frame 6 can better adapt to the shape of the ditch and fits tightly against the bottom and side walls of the ditch, increasing the stability of the valve. The upper frame 5 is located above the ditch. When the valve plate 1 needs to be operated, the upper frame 5 remains in a vertical position and together with the lower frame 6 forms a complete frame, ensuring that the valve plate 1 can move up and down smoothly to achieve the opening and closing function of the valve. When the valve plate 1 does not need to be operated, the design of the upper frame 5 that can be rotated and tilted plays an important role. By tilting the upper frame 5, a series of problems caused by the higher upper frame 5 standing upright can be avoided, such as affecting the aesthetics, occupying a large amount of space, posing safety hazards, stability issues, and increasing the load. This frame structure design not only meets the functional requirements of the flat gate valve during normal use, but also solves potential problems through the rotatable and tiltable upper frame 5, improving the practicality and adaptability of the flat gate valve.

[0047] The lower side of the base 3 is hinged to the valve plate 1 via a hinge.

[0048] When the valve plate 1 is in the closed state, the valve plate 1 is completely moved into the lower frame 6, and the hinge axis of the base 3 is coaxial with the hinge axis of the upper frame 5. At this time, the upper frame 5 can be rotated and laid down, and the hinges connected to the upper frame 5 and the base 3 respectively rotate synchronously.

[0049] When the valve plate 1 is in the closed state, the valve plate 1 moves completely into the lower frame 6. At this time, the hinge axis of the base 3 and the hinge axis of the upper frame 5 are coaxial. This design allows the upper frame 5 to rotate and fall more smoothly and in a coordinated manner when the upper frame 5 needs to be laid down. When the upper frame 5 is laid down, the hinges connected to the upper frame 5 and the base 3 respectively rotate synchronously, which ensures that the entire structure remains stable during the laying process and does not become unable to rotate, get stuck or be damaged due to inconsistent movement of different components. This coaxial hinge design makes operation easier and faster. The staff only needs to operate one component to drive the entire structure to move synchronously, thereby improving work efficiency.

[0050] It also includes a positioning device, which can position and fix the upper frame 5 in a vertical state. The positioning device includes a positioning rod 7 respectively arranged on the upper frame 5 and the lower frame 6, and also includes a positioning bar 8. The two ends of the positioning bar 8 are respectively provided with positioning holes corresponding to the positioning rod 7. The positioning rod 7 is connected to the positioning holes. A nut is threadedly connected to the positioning rod 7. Positioning devices are respectively provided on the left and right sides of the frame. The positioning device is mainly composed of the positioning rod 7 and the positioning bar 8 arranged on the upper frame 5 and the lower frame 6. When it is necessary to keep the upper frame 5 in a vertical state, the positioning device comes into play. The positioning holes at both ends of the positioning bar 8 correspond to the positioning rod 7. The positioning holes of the positioning bar 8 are put on the positioning rod 7 to achieve preliminary connection and positioning. Then, by threading a nut on the positioning rod 7, the connection between the positioning bar 8 and the positioning rod 7 can be further tightened, so that the upper frame 5 is firmly fixed in a vertical state.

[0051] The inner sides of the left and right arms of the upper and lower frames 5 and 6 are each provided with a slide groove. The slide grooves on the upper and lower frames 5 and 6 correspond vertically and are interconnected, with the valve plate 1 slidingly connected to the slide grooves. The slide grooves on the inner sides of the left and right arms of the upper and lower frames 5 and 6 guide the up and down movement of the valve plate 1, ensuring stable and accurate sliding within the frames. The slide grooves on the upper and lower frames 5 and 6 correspond vertically and are interconnected, forming a continuous sliding path. When the valve plate 1 needs to be opened or closed, it can slide smoothly up and down along this path. The sliding connection between the valve plate 1 and the slide grooves means that the two edges of the valve plate 1 can fit into the slide grooves, which act as a limiter and guide for the valve plate 1. During valve closing, the valve plate 1 moves vertically downward, guided by the slide grooves, ensuring that the valve plate 1 accurately contacts the sealing area of ​​the frame, achieving a good seal. During valve opening, the valve plate 1 slides upward along the slide grooves, without deviating from its predetermined trajectory due to external forces. The chute design also reduces friction between the valve plate 1 and the frame, lowering the force required for operation and making the valve opening and closing easier and more labor-saving. It also helps protect the edges of the valve plate 1, reducing the risk of wear and damage and extending the service life of the valve plate 1.

[0052] When the valve plate 1 is in the closed state, the lower end of the valve stem 4 is set higher than the hinge axis of the base 3. This design takes into account the situation where the upper frame 5 can be rotated and laid down. If the lower end of the valve stem 4 is lower than or at the same height as the hinge axis of the base 3 when the valve plate 1 is in the closed state, then when the upper frame 5 is rotated and laid down, the valve stem 4 is likely to collide with the valve plate 1, damaging the valve stem 4 and the valve plate 1. By setting the lower end of the valve stem 4 at a position higher than the hinge axis of the base 3, it is ensured that during the process of rotating and laying down the upper frame 5, the valve stem 4 can smoothly rotate with the upper frame 5 without interfering with the valve plate 1. This can avoid damage to components caused by collisions and ensure the safety and reliability of the valve in different operating states.

[0053] Support rods 9 are provided on the left and right sides of the upper end of the upper frame 5. When the upper frame 5 needs to be laid down, the support rods 9 play a supporting and stabilizing role. After the upper frame 5 is laid down, it can be placed on both sides of the ditch by the support rods 9 on both sides. This design enables the upper frame 5 to maintain a stable position when laid down, and will not move or shake at will due to its own weight or external forces. The position of the support rods 9 is designed to be on the left and right sides of the upper end of the frame, which can effectively disperse the weight of the upper frame 5 and make the support more uniform and stable. When selecting the material and size of the support rods 9, the weight of the upper frame 5 and the external forces that may be borne are usually taken into consideration to ensure that the support rods 9 can provide sufficient strength and stability.

[0054] In the above technical solution, the valve plate 1 is usually in only two states: one is when the valve plate 1 is in the closed state and the valve plate 1 is completely moved into the lower frame 6; the other is when the valve plate 1 is in the closed state and the valve plate 1 is completely moved into the lower frame 6. In both states, the upper frame 5 is in the down position.

[0055] In the above technical solution, if the upper frame 5 is to be kept in the laid-down state, the valve plate 1 cannot be in the semi-open state or the partially open state.

[0056] Therefore, the following improvements are made:

[0057] The valve plate 1 can be in a semi-open state: the valve plate 1 includes an upper plate body 11 and a lower plate body 12 arranged upper and lower, and also includes a flexible plate body 14 with the same appearance as the valve plate 1. The flexible plate body 14 is fixedly connected to the upper plate body 11 and the lower plate body 12. This connection method enables the valve plate 1 to maintain its integrity in different states.

[0058] When the valve disc 1 moves upward to open, a special state occurs when the lower end of the upper plate 11 aligns with the hinge axis of the upper frame 5. At this point, the upper plate 11 enters the upper frame 5, while the lower plate 12 remains within the lower frame 6. Due to the positional relationship between the upper frame 5 and the upper plate 11, the upper plate 11 can rotate and fall with the upper frame 5. This state is equivalent to the valve disc 1 being in a semi-open state, providing more options for flow control in the slab gate valve.

[0059] The properties of the flexible plate 14 play a crucial role in this process. As the upper plate 11 rotates with the upper frame 5, the flexible plate 14 bends due to its inherent elasticity. This elastic bending allows the valve plate 1 to adapt to varying water flow conditions and operational requirements in the semi-open state.

[0060] The flexible plate 14 connects the upper plate 11 and the lower plate 12 and is a key component for achieving a semi-open state of the valve plate 1. In terms of material properties, the flexible plate 14 has excellent elasticity and flexibility. This allows it to bend elastically during operation of the valve plate 1, adapting to the changes in the upper plate 11 as it rotates and tilts with the upper frame 5, as well as in different valve states. Structurally, the flexible plate 14 is typically made of a relatively thin but sturdy material, such as rubber, silicone, or other elastic materials. It is typically connected to the upper plate 11 and the lower plate 12 using a firm adhesive, riveting, or other suitable connection method to ensure that it will not fall off or be damaged during long-term use. The presence of the flexible plate 14 not only enables the valve plate 1 to achieve a semi-open state, but also, to a certain extent, alleviates the stress caused by the impact of water flow on the overall structure of the valve plate 1, acting as a buffer and protector. At the same time, its elastic properties also help to improve the sealing of the valve. When the valve is closed, the flexible plate 14 can better fit the frame to prevent water leakage.

[0061] When the valve disc is closed, leaks may occur if the seal between the upper and lower plates and the frame is not tight. For example, wear and deformation of the sealing surfaces due to long-term use, or debris lodged in the seals, can compromise the seal and cause leakage. Loose or damaged connections between the flexible plate and the upper and lower plates can also cause leaks. Especially under water pressure and frequent operation, these connections may gradually fatigue and fail.

[0062] When the valve disc is in a semi-open position, the upper plate rotates and tilts with the upper frame, causing the flexible plate to elastically bend. This process can alter the sealing structure and increase the possibility of leakage. For example, the bending of the flexible plate can create a gap between the flexible plate and the frame, leading to water leakage. In the semi-open state, the complex flow pattern of water may generate uneven pressure on the valve disc and frame, further affecting the sealing effect.

[0063] Measures to reduce leakage risk: Material selection: Choose high-quality sealing materials for the seals between the upper and lower panels and the frame. For example, using wear-resistant, corrosion-resistant, and elastic rubber seals can improve sealing performance and extend service life. Ensure that the flexible panel material has good elasticity and corrosion resistance, and that the connection with the upper and lower panels is secure and reliable.

[0064] Design Optimization: Optimize the sealing structure between the valve plate and frame to increase the contact area and pressure, thereby enhancing the sealing effect. For example, a multi-stage sealing structure or reinforcing ribs can be used to enhance the stability of the seal. In the semi-open state, the bending degree of the flexible plate and its fit with the frame should be rationally designed to minimize gaps.

[0065] Maintenance: Regularly inspect and maintain the flat gate valve, clean up debris and dirt in the sealing area in time to prevent damage to the seal. Replace the seals and flexible plates that are severely worn in time to ensure the sealing performance of the valve.

[0066] Although this type of flat gate valve may have leakage problems under certain circumstances, reasonable design, material selection and maintenance can effectively reduce the risk of leakage and ensure the normal operation of the valve.

[0067] In addition, the sealing requirements for canals are not very high, and slight leakage is allowed, which relaxes the requirements for valve performance to a certain extent. Slight leakage may not have a significant impact on the main function of the canal. For example, in some canals used for irrigation or drainage, a small amount of leakage may not significantly affect the overall flow and distribution of water.

[0068] The valve plate 1 can be in a partially open state: the valve plate 1 is composed of a plurality of sub-plates 13 arranged in an up-and-down direction, and also includes a flexible plate 14 with the same shape as the valve plate 1. The flexible plate 14 is fixedly connected to the sub-plates 13. This allows the valve plate 1 to bend between two adjacent sub-plates 13, thereby adjusting the opening of the valve plate 1.

[0069] The valve plate 1 is composed of a number of sub-plates 13 arranged in an up-down direction. This structure provides a basis for achieving different degrees of opening. Each sub-plate 13 can move relatively independently. By bending between two adjacent sub-plates 13, the size of the opening of the valve plate 1 can be adjusted. The flexible plate 14 is fixedly connected to the sub-plate 13. Due to its flexibility, it can deform accordingly as the sub-plate 13 bends. The presence of the flexible plate 14 makes the valve plate 1 smoother during bending operations, and can also ensure the integrity and stability of the valve plate 1 to a certain extent. In actual use, when it is necessary to adjust the size of the water flow in the canal without fully opening or closing the valve, this partially open state is very useful. By adjusting the bending position of the valve plate 1 between different sub-plates 13, the flow rate of the water can be precisely controlled. For example, in an irrigation system, the degree of opening of the valve can be adjusted according to the water demand of different crops to achieve reasonable water resource allocation.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gate valve with variable height, comprising a vertically arranged frame, a valve plate (1) being provided in the frame and being capable of sliding up and down, a top seat (2) being provided at the upper end of the frame, a base (3) being provided at the upper end of the valve plate (1), and a valve stem (4), the valve stem (4) being rotatably connected to the top seat (2), and the valve stem (4) being threadedly connected to the base (3), characterized in that: The frame comprises an upper frame (5) and a lower frame (6) arranged above and below, and the upper frame (5) and the lower frame (6) are hinged; The lower side of the base (3) is hinged to the valve plate (1); It also includes a positioning device, which can position and fix the upper frame (5) in a vertical state; When the valve plate (1) is in a closed state, the lower end of the valve stem (4) is higher than the hinge axis of the base (3), the valve plate (1) moves into the lower frame (6), the hinge axis of the base (3) and the hinge axis of the upper frame (5) are coaxial, and the upper frame (5) can be rotated and laid down; When the valve plate (1) is in an open state, the valve plate (1) moves into the upper frame (5), and the upper frame (5) can be rotated and laid down.

2. A height-variable gate valve according to claim 1, characterized in that: The positioning device comprises positioning rods (7) respectively arranged on the upper frame (5) and the lower frame (6), and also comprises a positioning bar (8). Both ends of the positioning bar (8) are respectively provided with positioning holes corresponding to the positioning rods (7). The positioning rods (7) are connected to the positioning holes. A nut is threadedly connected to the positioning rods (7). Positioning devices are respectively provided on the left and right sides of the frame.

3. The height-variable gate valve according to claim 1, characterized in that: The upper frame (5) is a U-shaped structure with an opening facing downward, and the lower frame (6) is a U-shaped structure with an opening facing upward.

4. A height-variable gate valve according to claim 3, characterized in that: Slide grooves are respectively provided on the inner side surfaces of the left and right arms of the upper frame (5) and the lower frame (6). The slide grooves on the upper frame (5) and the lower frame (6) correspond to each other and are connected, and the valve plate (1) is slidably connected to the slide grooves.

5. The height-variable gate valve according to claim 1, characterized in that: Support rods (9) are respectively provided on the left and right sides of the upper end of the upper frame (5).

6. The height-variable gate valve according to claim 1, characterized in that: The valve plate (1) comprises an upper plate body (11) and a lower plate body (12) arranged one above the other, and further comprises a flexible plate body (14) having the same shape as the valve plate (1), wherein the flexible plate body (14) is fixedly connected to the upper plate body (11) and the lower plate body (12).

7. The height-variable gate valve according to claim 1, characterized in that: The valve plate (1) is composed of a plurality of sub-plate bodies (13) arranged in an up-down direction, and further comprises a flexible plate body (14) having the same shape as the valve plate (1), wherein the flexible plate body (14) is fixedly connected to the sub-plate body (13).

8. The height-variable gate valve according to claim 1, characterized in that: The upper end of the valve stem (4) is connected to a hand wheel (15).

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