Screwing guide expansion type gate valve

Abstract

The invention provides a screwing guide expansion type gate valve, and relates to the technical field of gate valves. The top of the main valve body is fixedly connected with a sealing top cover, two rubber sealing rings are installed in the main valve body, and the two rubber sealing rings are located at a water inlet and a water outlet of the main valve body respectively. A brake core assembly is installed in the main valve body and makes contact with the two rubber sealing rings. And a transmission screw rod is connected into the sealing top cover in a penetrating manner. In the downward moving process of the middle core piece, the stress inclined face A and the stress inclined face B make contact and are stressed, the middle core piece drives the two side core pieces to synchronously move outwards, the side core pieces make close contact with the rubber sealing rings, and the sealing performance after the gate valve is closed is guaranteed. The gate valve solves the problems that when an existing gate valve stops medium circulation, media in valve channels at the two ends are usually stopped through reciprocating lifting of a gate plate, certain impulsive force is generated when the media in the valve channels circulate, a certain gap exists between a valve plate and the end faces of the valve channels, and the sealing performance is insufficient.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, and in particular to a rotary guide expansion type gate valve. Background Art

[0002] A gate valve is a gate plate that opens and closes. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. It is usually sealed by the contact between the valve seat and the gate plate. The sealing surface between them will be welded with metal materials to increase wear resistance. The gate plate is divided into a rigid gate plate and an elastic gate plate. Therefore, according to the different gate plates used in the gate valve, the gate valve is divided into a rigid gate valve and an elastic gate valve.

[0003] For example, the Chinese patent "CN113464672A a self-expanding gate valve" includes a main valve body, and tubular valve channels connected to the medium pipeline are respectively installed at both ends of the main valve body; a sealing air ring is arranged on the periphery of the flange annular hole on the valve plate for connecting the medium flow of the valve channels at both ends, when the connecting ring is displaced under the action of the impact force of the medium, the pressure ring on the connecting ring is used to squeeze the inner ring surface of the sealing air ring, so that the sealing air ring expands to a certain extent, and contacts the surface of the valve channel port to seal, thereby improving the sealing effect in the equipment; at the same time, when the valve plate is in the state of cutting off the flow of the medium in the valve channels at both ends, the impact force of the medium is used to make the sliding piece arranged above the flange annular hole slide to a certain extent, and squeeze the air storage ring arranged inside the circular groove, so that the air storage ring inflates the air ring to make it expand, thereby improving the sealing effect of cutting off the flow of the medium.

[0004] When the existing gate valve cuts off the flow of medium, it usually cuts off the medium in the valve channels at both ends by reciprocating the lifting of the gate plate. When the medium in the valve channel flows, a certain impact force is generated, resulting in a certain gap between the valve plate and the end face of the valve channel. During the long-term use of the gate valve, the sealing surface between the valve plate and the valve channel will continue to rub, causing a certain degree of wear on the sealing surface, resulting in insufficient sealing. Summary of the invention

[0005] The present invention relates to a screw-in guided expansion gate valve, which solves the problem that when the flow of medium is cut off, the existing gate valve usually cuts off the medium in the valve channels at both ends by reciprocating the lifting and lowering of the gate plate. When the medium in the valve channel flows, a certain impact force is generated, resulting in a certain gap between the valve plate and the end surface of the valve channel. During the long-term use of the gate valve, the sealing surface between the valve plate and the valve channel will rub continuously, causing a certain degree of wear on the sealing surface, resulting in insufficient sealing.

[0006] In a first aspect of the present disclosure, a rotary guided expansion gate valve is provided, which specifically comprises: a main valve body, a sealing top cover, a rubber sealing ring, a gate core assembly, a transmission screw, a nut, a movable lifting frame and an adjusting hand wheel; a sealing top cover is fixedly connected to the top of the main valve body, two rubber sealing rings are installed inside the main valve body, and the two rubber sealing rings are respectively located at the water inlet and the water outlet of the main valve body; a gate core assembly is installed inside the main valve body, and the gate core assembly is in contact with the two rubber sealing rings; a transmission screw is connected through the inside of the sealing top cover, the bottom end of the transmission screw is connected to the gate core assembly, a nut is connected to the top of the sealing top cover, and the transmission screw is connected to the nut; a movable lifting frame is connected to the top of the sealing top cover, and an adjusting hand wheel is connected to the top of the movable lifting frame, and the adjusting hand wheel is connected to the nut.

[0007] Furthermore, the gate core assembly is slidably connected to the inside of the main valve body. When the gate core assembly moves to the topmost point, the valve hole inside the gate core assembly is communicated with the water inlet and the water outlet of the main valve body.

[0008] Furthermore, the gate core assembly is composed of a central core member, a side core member, a movable force-bearing member and a reset spring A. Force-bearing inclined surfaces A are arranged on opposite sides of the central core member, and a force-bearing inclined surface B is arranged on the side of the side core member close to the central core member. The force-bearing inclined surface A is in sliding contact with the force-bearing inclined surface B, the top of the side core member is bent outward, and the side core member is in contact with the rubber sealing ring.

[0009] Furthermore, a mushroom column is provided at the bottom of the central core member, the movable force-bearing member is slidably connected to the mushroom column, a sliding hole is provided at the bottom of the side core member, linkage sliders are provided at both ends of the movable force-bearing member, and the linkage sliders are slidably connected in the sliding hole.

[0010] Furthermore, the return spring A is sleeved on the outside of the mushroom column, the top of the return spring A contacts the central core piece, and the bottom of the return spring A contacts the top of the movable force-bearing piece. During the downward movement of the central core piece, the return spring A applies a thrust to the movable force-bearing piece, so that the movable force-bearing piece drives the left and right side core pieces to move downward synchronously. When the top bending part of the side core piece contacts the main valve body, the side core piece stops moving downward, and the central core piece continues to move downward. The return spring A contracts under force, and the force-bearing inclined surface A contacts and bears force on the force-bearing inclined surface B. The central core piece drives the two side core pieces to move outward synchronously, so that the side core pieces are in close contact with the rubber sealing ring to ensure the sealing of the gate valve after closing. During the upward movement of the central core piece, the movable force-bearing piece moves to the bottom end under the influence of the thrust of the return spring A, and the central core piece drives the left and right side core pieces to move upward synchronously through the movable force-bearing piece, so that the valve hole inside the gate core assembly is connected with the water inlet and outlet of the main valve body.

[0011] Furthermore, the transmission screw is slidingly connected to the sealing top cover, a T-shaped slot is provided on the top of the core piece, the bottom end of the transmission screw is connected to the T-shaped slot, the nut is rotationally connected to the sealing top cover, the top of the transmission screw is threadedly connected to the nut, and the top of the nut is a hexagonal structure.

[0012] Furthermore, a damping spring is mounted on the outside of the transmission screw, and the damping spring is located outside the sealing top cover. The bottom of the damping spring contacts the sealing top cover, and the top of the damping spring contacts the bottom of the nut. By applying thrust to the nut through the damping spring, the rotational resistance of the nut can be effectively increased, thereby preventing rotation caused by vibration and ensuring the stability of the gate valve during use.

[0013] Furthermore, a guide vertical hole is arranged on the outside of the sealing top cover, and vertical guide rods are arranged at both ends of the bottom of the movable lifting frame, and the vertical guide rods slide through the guide vertical hole.

[0014] Furthermore, a return spring B is sleeved on the outside of the vertical guide rod, the top of the return spring B contacts the top of the movable lifting frame, and the bottom of the return spring B contacts the sealing top cover. Through the sliding cooperation between the vertical guide rod and the guide vertical hole, it can not only effectively ensure the stability and accuracy of the movable lifting frame when moving up and down, avoiding the instability caused by deflection or shaking, but also use the force of the return spring B to realize the automatic resetting function of the movable lifting frame after movement.

[0015] Furthermore, the adjusting handwheel is rotatably connected to the movable lifting frame, and a hexagonal through hole is arranged inside the adjusting handwheel. When the adjusting handwheel moves to the bottommost end, the top of the nut is inserted into the hexagonal through hole. When the gate valve needs to be opened or closed, the adjusting handwheel is first pressed downward to force the movable lifting frame to move downward. At this time, the reset spring B is compressed, causing the top of the nut to be inserted into the hexagonal through hole on the adjusting handwheel. The nut is driven to rotate by turning the adjusting handwheel, and then the gate core assembly is driven up and down by the transmission screw, thereby realizing the opening or closing function of the gate valve; when the gate valve is opened or closed, the adjusting handwheel is released, and the movable lifting frame is driven by the thrust of the reset spring B to drive the adjusting handwheel to return and rise, so that the top of the nut is disengaged from the hexagonal through hole. Even if the adjusting handwheel is accidentally touched, it will only rotate by itself and will not drive the nut to rotate, thereby effectively preventing the gate valve from being accidentally opened or closed due to misoperation.

[0016] The present invention provides a rotary guide expansion gate valve, which has the following beneficial effects:

[0017] When the present invention is in use, during the downward movement of the central core member, a thrust is applied to the movable force-bearing member through the return spring A, so that the movable force-bearing member drives the side core members on the left and right sides to move downward synchronously. When the bent portion at the top of the side core member contacts the main valve body, the side core members stop moving downward, while the central core member continues to move downward, causing the return spring A to be compressed. At this time, the force-bearing inclined surface A and the force-bearing inclined surface B begin to contact and bear pressure. As the central core member moves further downward, the interaction between the two inclined surfaces prompts the central core member to push the two side core members to expand outward, thereby ensuring that the side core members can be tightly It fits on the rubber sealing ring, which enhances the sealing performance of the gate valve after it is closed, and effectively prevents possible leakage of the medium when the valve is closed. When the central core moves upward, the movable force-bearing part will be pushed to its lowest position due to the force of the reset spring A. Subsequently, the central core drives the side core parts on the left and right sides to rise together through the movable force-bearing part, and finally realizes the connection between the valve hole formed inside the gate core assembly and the water inlet and outlet of the main valve body, completing the process conversion from closing to opening. It is easy to operate, quicker to get started, and reduces the time for learning and adaptation.

[0018] In addition, by applying thrust to the nut through the damping spring, the rotational resistance of the nut can be effectively increased, thereby preventing rotation caused by vibration and ensuring the stability of the gate valve during use. The tight sliding fit between the vertical guide rod and the guide vertical hole can not only ensure the stability and accuracy of the movable lifting frame when moving up and down, avoiding instability caused by deflection or shaking, but also use the force of the reset spring B to achieve the automatic reset function of the movable lifting frame after movement, thereby improving reliability and ease of operation.

[0019] In addition, when it is necessary to open or close the gate valve, first press the adjusting handwheel downward to force the movable lifting frame to move downward. At this time, the reset spring B is compressed, causing the top of the nut to be inserted into the hexagonal through hole on the adjusting handwheel. The nut is driven to rotate by turning the adjusting handwheel, and then the gate core assembly is driven up and down by the transmission screw, thereby realizing the opening or closing function of the gate valve; when the gate valve is opened or closed, release the adjusting handwheel, and the movable lifting frame is driven by the thrust of the reset spring B to drive the adjusting handwheel to return and rise, so that the top of the nut is disengaged from the hexagonal through hole. Even if the adjusting handwheel is accidentally touched, it will only rotate by itself and will not drive the nut to rotate, thereby effectively preventing the gate valve from being accidentally opened or closed due to misoperation, ensuring the stability and safety of the gate valve during use, with good maintainability and durability, and is very suitable for long-term use in various complex environments.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0022] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0023] In the attached picture:

[0024] Figure 1 The overall structural diagram of the rotary guide expansion gate valve of the present application is shown;

[0025] Figure 2 A schematic cross-sectional structure diagram of the rotary guide expansion gate valve of the present application in a closed state is shown;

[0026] Figure 3 A schematic cross-sectional structure diagram of the rotary guide expansion gate valve of the present application in an open state is shown;

[0027] Figure 4 A schematic diagram of the cross-sectional structure of the main valve body of the rotary guide expansion gate valve of the present application is shown;

[0028] Figure 5 It shows a schematic diagram of the shaft side structure of the rotary guided expansion gate valve of the present application when the side core piece is in the inward moving state;

[0029] Figure 6 It shows a schematic diagram of the shaft side structure of the rotary guided expansion gate valve of the present application when the side core piece is in an outward moving state;

[0030] Figure 7 A schematic diagram showing the disassembled structure of the gate core assembly of the rotary guided expansion gate valve of the present application is shown;

[0031] Figure 8 A schematic diagram of the connection structure between the sealing top cover and the movable lifting frame of the rotary guide expansion gate valve of the present application is shown;

[0032] Fig. 9 A schematic diagram of the disassembled structure of the sealing top cover, nut and damping spring of the screw-in guide expansion gate valve of the present application is shown;

[0033] Fig.10 A schematic diagram of the split structure of the movable lifting frame and the regulating hand wheel of the rotary guided expansion gate valve of the present application is shown.

[0034] Reference numerals list

[0035] 1. Main valve body; 2. Sealing top cover; 201. Vertical guide hole; 3. Rubber sealing ring; 4. Gate core assembly; 41. Center core piece; 4101. Force-bearing inclined surface A; 4102. Mushroom column; 4103. T-slot; 42. Side core piece; 4201. Force-bearing inclined surface B; 4202. Sliding hole; 43. Movable force-bearing piece; 4301. Linkage slider; 44. Reset spring A; 6. Transmission screw; 7. Nut; 8. Damping spring; 9. Movable lifting frame; 901. Vertical guide rod; 10. Adjusting hand wheel; 1001. Hexagonal through hole; 11. Reset spring B. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figures 1 to 10 :

[0038] The present invention proposes a screw-on guided expansion gate valve, comprising: a main valve body 1, a sealing top cover 2, a rubber sealing ring 3, a gate core assembly 4, a driving screw 6, a nut 7, a movable lifting frame 9 and an adjusting hand wheel 10; the sealing top cover 2 is fixedly connected to the top of the main valve body 1, two rubber sealing rings 3 are installed inside the main valve body 1, and the two rubber sealing rings 3 are respectively located at the water inlet and the water outlet of the main valve body 1; the gate core assembly 4 is installed inside the main valve body 1, and the gate core assembly 4 is in contact with the two rubber sealing rings 3; the sealing A driving screw 6 is connected through the inside of the capping cover 2, and the bottom end of the driving screw 6 is connected to the gate core assembly 4. A nut 7 is connected to the top of the sealing top cover 2, and the driving screw 6 is connected to the nut 7; a movable lifting frame 9 is connected to the top of the sealing top cover 2, and an adjusting hand wheel 10 is connected to the top of the movable lifting frame 9, and the adjusting hand wheel 10 is connected to the nut 7; the gate core assembly 4 is slidably connected to the inside of the main valve body 1, and when the gate core assembly 4 moves to the topmost point, the valve hole inside the gate core assembly 4 is connected to the water inlet and outlet of the main valve body 1.

[0039] In the disclosed embodiment, the gate core assembly 4 is composed of a central core member 41, a side core member 42, a movable force-bearing member 43 and a reset spring A44. The central core member 41 is provided with force-bearing inclined surfaces A4101 on opposite sides, and the side core member 42 is provided with a force-bearing inclined surface B4201 on the side close to the central core member 41. The force-bearing inclined surface A4101 is in sliding contact with the force-bearing inclined surface B4201. The top of the side core member 42 is bent outward, and the side core member 42 is in contact with the rubber sealing ring 3. The central core member 41 is provided with a force-bearing inclined surface A4101. A mushroom column 4102 is provided at the bottom, and a movable force-bearing member 43 is slidably connected with the mushroom column 4102. A sliding hole 4202 is provided at the bottom of the side core member 42. Linkage sliders 4301 are provided at both ends of the movable force-bearing member 43. The linkage sliders 4301 are slidably connected in the sliding holes 4202. A return spring A44 is sleeved on the outside of the mushroom column 4102. The top of the return spring A44 contacts the middle core member 41, and the bottom of the return spring A44 contacts the top of the movable force-bearing member 43.

[0040] By adopting the above technical solution, during the downward movement of the central core member 41, the return spring A44 applies a thrust to the movable force-bearing member 43, so that the movable force-bearing member 43 drives the left and right side core members 42 to move downward synchronously. When the top bending part of the side core member 42 contacts the main valve body 1, the side core member 42 stops moving downward, and the central core member 41 continues to move downward. The return spring A44 contracts under force, and the force-bearing inclined surface A4101 contacts the force-bearing inclined surface B4201 under force. The central core member 41 drives the two side core members 42 to move outward synchronously, so that the side core members 42 are moved downward synchronously. The core piece 42 is in close contact with the rubber sealing ring 3 to ensure the sealing of the gate valve after closing, and effectively avoid the occurrence of medium leakage when the gate valve is closed; during the upward movement of the central core piece 41, the movable force-bearing piece 43 is moved to the bottom end under the thrust of the reset spring A44, and the central core piece 41 drives the left and right side core pieces 42 to move upward synchronously through the movable force-bearing piece 43, so that the valve hole inside the gate core assembly 4 is connected with the water inlet and outlet of the main valve body 1. It is easy to operate, quicker to get started, and reduces the time for learning and adaptation.

[0041] Embodiment 2, on the basis of embodiment 1, the transmission screw 6 is slidably connected with the sealing top cover 2, a T-shaped slot 4103 is provided on the top of the central core 41, the bottom end of the transmission screw 6 is connected in the T-shaped slot 4103, the nut 7 is rotatably connected with the sealing top cover 2, the top of the transmission screw 6 is threadedly connected in the nut 7, the top of the nut 7 is a hexagonal structure, the outside of the transmission screw 6 is sleeved with a damping spring 8, the damping spring 8 is located outside the sealing top cover 2, the bottom of the damping spring 8 is in contact with the sealing top cover 2, and the top of the damping spring 8 is in contact with the bottom of the nut 7;

[0042] By adopting the above technical solution, the thrust is applied to the nut 7 by the damping spring 8, which can effectively increase the rotation resistance of the nut 7, thereby preventing rotation caused by vibration and ensuring the stability of the gate valve during use.

[0043] Embodiment 3, on the basis of Embodiment 1 and Embodiment 2, a guide vertical hole 201 is provided on the outside of the sealing top cover 2, and vertical guide rods 901 are provided at both ends of the bottom of the movable lifting frame 9, and the vertical guide rods 901 slide through the guide vertical hole 201, and a return spring B11 is sleeved on the outside of the vertical guide rod 901, and the top of the return spring B11 contacts the top of the movable lifting frame 9, and the bottom of the return spring B11 contacts the sealing top cover 2;

[0044] By adopting the above technical solution, through the sliding cooperation between the vertical guide rod 901 and the guide vertical hole 201, not only can the stability and accuracy of the movable lifting frame 9 when moving up and down be effectively guaranteed, and the instability caused by deflection or shaking be avoided, but also the force of the reset spring B11 is used to realize the automatic reset function of the movable lifting frame 9 after movement.

[0045] In the disclosed embodiment, the adjusting hand wheel 10 is rotatably connected to the movable lifting frame 9, and a hexagonal through hole 1001 is provided inside the adjusting hand wheel 10. When the adjusting hand wheel 10 moves to the bottom, the top of the nut 7 is inserted into the hexagonal through hole 1001;

[0046] By adopting the above technical solution, when it is necessary to open or close the gate valve, first press the adjusting hand wheel 10 downward to force the movable lifting frame 9 to move downward. At this time, the reset spring B11 is compressed, causing the top of the nut 7 to be inserted into the hexagonal through hole 1001 on the adjusting hand wheel 10. The nut 7 is driven to rotate by turning the adjusting hand wheel 10, and then the gate core assembly 4 is driven to move up and down through the transmission screw 6, thereby realizing the opening or closing function of the gate valve; when the gate valve is opened or closed, release the adjusting hand wheel 10, and the movable lifting frame 9 is driven by the thrust of the reset spring B11 to drive the adjusting hand wheel 10 to return and rise, so that the top of the nut 7 is disengaged from the hexagonal through hole 1001. Even if the adjusting hand wheel 10 is accidentally touched, it will only rotate by itself and will not drive the nut 7 to rotate, thereby effectively preventing the gate valve from being accidentally opened or closed due to misoperation, ensuring the stability and safety of the gate valve during use, having good maintainability and durability, and being very suitable for long-term use in various complex environments.

[0047] The working principle of this embodiment is as follows: when the gate valve needs to be closed, the adjusting hand wheel 10 is first pressed downward to force the movable lifting frame 9 to move downward. At this time, the reset spring B11 is compressed, causing the top of the nut 7 to be inserted into the hexagonal through hole 1001 on the adjusting hand wheel 10. The nut 7 is rotated by turning the adjusting hand wheel 10, and then the gate core assembly 4 is driven to move downward through the transmission screw 6; during the downward movement of the central core member 41, the movable force-bearing member 43 is thrusted by the reset spring A44, so that the movable force-bearing member 43 drives the left and right side core members 42 to move downward synchronously. When the top bending part of the side core member 42 contacts the main valve body 1, the side core member 42 stops moving downward, and the central core member 41 continues to move downward. When the gate valve moves downward, the reset spring A44 contracts under force, the force-bearing inclined surface A4101 contacts the force-bearing inclined surface B4201, and the central core member 41 drives the two side core members 42 to move outward synchronously, so that the side core members 42 are in close contact with the rubber sealing ring 3, thereby ensuring the sealing of the gate valve after closing, and effectively avoiding the occurrence of medium leakage when the gate valve is closed; next, the adjusting hand wheel 10 is loosened, and the movable lifting frame 9 is driven by the thrust of the reset spring B11 to drive the adjusting hand wheel 10 to return and rise, so that the top of the nut 7 is separated from the hexagonal through hole 1001, and even if the adjusting hand wheel 10 is accidentally touched, it will only rotate by itself without driving the nut 7 to rotate, thereby effectively preventing the gate valve from accidentally opening due to misoperation;

[0048] When it is necessary to open the gate valve, repeat the same operation as above, insert the top of the nut 7 into the hexagonal through hole 1001 on the adjusting handwheel 10, and drive the nut 7 to rotate by turning the adjusting handwheel 10, and then drive the gate core assembly 4 to move upward through the transmission screw 6; during the upward movement of the central core member 41, the movable force-bearing member 43 is affected by the thrust of the reset spring A44 and moves to the bottom, and the central core member 41 drives the left and right side core members 42 to move upward synchronously through the movable force-bearing member 43, so that the valve hole inside the gate core assembly 4 is connected with the water inlet and outlet of the main valve body 1, and the gate valve is in an open state; and release the adjusting handwheel 10, the adjusting handwheel 10 returns to its original position and rises, and the nut 7 is disengaged from the adjusting handwheel 10, thereby effectively preventing the gate valve from being accidentally closed due to misoperation. It has good maintainability and durability, and is very suitable for long-term use in various complex environments.

[0049] In this article, there are a few points to note:

[0050] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0051] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0052] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A rotary guided expansion gate valve, comprising: A main valve body (1), a sealing top cover (2), a rubber sealing ring (3), a gate core assembly (4), a transmission screw (6), a nut (7), a movable lifting frame (9) and an adjusting hand wheel (10); characterized in that the sealing top cover (2) is fixedly connected to the top of the main valve body (1), two rubber sealing rings (3) are installed inside the main valve body (1), and the two rubber sealing rings (3) are respectively located at the water inlet and the water outlet of the main valve body (1); the gate core assembly ( 4), the gate core assembly (4) is in contact with two rubber sealing rings (3); a transmission screw (6) is connected through the inside of the sealing top cover (2), the bottom end of the transmission screw (6) is connected to the gate core assembly (4), a nut (7) is connected to the top of the sealing top cover (2), and the transmission screw (6) is connected to the nut (7); a movable lifting frame (9) is connected to the top of the sealing top cover (2), and an adjusting hand wheel (10) is connected to the top of the movable lifting frame (9), and the adjusting hand wheel (10) is connected to the nut (7).

2. A screw-on guide expansion gate valve according to claim 1, characterized in that: The gate core assembly (4) is slidably connected to the inside of the main valve body (1); when the gate core assembly (4) moves to the topmost position, the valve hole inside the gate core assembly (4) is connected to the water inlet and the water outlet of the main valve body (1).

3. A screw-on guide expansion gate valve according to claim 1, characterized in that: The gate core assembly (4) is composed of a central core member (41), a side core member (42), a movable force-bearing member (43) and a return spring A (44); force-bearing inclined surfaces A (4101) are arranged on opposite sides of the central core member (41); a force-bearing inclined surface B (4201) is arranged on the side of the side core member (42) close to the central core member (41); the force-bearing inclined surface A (4101) is in sliding contact with the force-bearing inclined surface B (4201); the top of the side core member (42) is bent outward, and the side core member (42) is in contact with the rubber sealing ring (3).

4. A screw-on guide expansion gate valve according to claim 3, characterized in that: A mushroom column (4102) is arranged at the bottom of the central core member (41), the movable force-bearing member (43) is slidably connected to the mushroom column (4102), a sliding hole (4202) is arranged at the bottom of the side core member (42), and linkage sliders (4301) are arranged at both ends of the movable force-bearing member (43), and the linkage sliders (4301) are slidably connected in the sliding holes (4202).

5. A screw-on guide expansion gate valve according to claim 4, characterized in that: The return spring A (44) is sleeved on the outside of the mushroom column (4102), the top of the return spring A (44) contacts the core member (41), and the bottom of the return spring A (44) contacts the top of the movable force-bearing member (43).

6. A screw-on guide expansion gate valve according to claim 3, characterized in that: The transmission screw (6) is slidably connected to the sealing top cover (2); a T-shaped groove (4103) is provided on the top of the central core (41); the bottom end of the transmission screw (6) is connected to the T-shaped groove (4103); the nut (7) is rotatably connected to the sealing top cover (2); the top of the transmission screw (6) is threadedly connected to the nut (7); and the top of the nut (7) is in a hexagonal structure.

7. A screw-on guide expansion gate valve according to claim 1, characterized in that: A damping spring (8) is sleeved on the outside of the transmission screw (6), and the damping spring (8) is located outside the sealing top cover (2). The bottom of the damping spring (8) contacts the sealing top cover (2), and the top of the damping spring (8) contacts the bottom of the nut (7).

8. The rotary guide expansion gate valve according to claim 1, characterized in that: A guide vertical hole (201) is arranged outside the sealing top cover (2), and vertical guide rods (901) are arranged at both ends of the bottom of the movable lifting frame (9), and the vertical guide rods (901) slide through the guide vertical hole (201).

9. A screw-on guide expansion gate valve according to claim 8, characterized in that: The vertical guide rod (901) is externally sleeved with a return spring B (11), the top of the return spring B (11) contacts the top of the movable lifting frame (9), and the bottom of the return spring B (11) contacts the sealing top cover (2).

10. The screw-on guide expansion gate valve according to claim 1, characterized in that: The adjusting hand wheel (10) is rotatably connected to the movable lifting frame (9), and a hexagonal through hole (1001) is arranged inside the adjusting hand wheel (10). When the adjusting hand wheel (10) moves to the bottom, the top of the nut (7) is inserted into the hexagonal through hole (1001).

Images