A spiral wedge tight type rising stem gate valve

Abstract

This invention relates to the field of valve technology and discloses a spiral wedge-type rising stem gate valve, including a valve body and a valve cover, and a gate component and a valve stem component installed in the valve body and valve cover. The gate component and the valve stem component are movably installed together, and the valve stem component extends to the outside and is threadedly installed with the valve cover to drive the sliding of the gate component. Through the split gate structure and hydraulic transmission, after leakage caused by wear or extrusion deformation, it is not necessary to disassemble and replace the entire valve. Only the top of the valve stem needs to be adjusted to compensate for the gap caused by wear, which greatly extends the overall service life of the valve and reduces the operating cost. Moreover, through the sliding setting of the auxiliary abutment component, it can automatically adapt to the gap difference caused by the different wear levels of the gate sealing gaskets on both sides, ensuring that the sealing surfaces on both sides are always subjected to uniform force and fit tightly, effectively avoiding the problem of excessive wear on one side of the sealing surface requiring fine adjustment.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a spiral wedge-type rising stem gate valve. Background Technology

[0002] Wedge gate valves, a common type of shut-off valve, have wedge-shaped sealing surfaces on both sides of the gate (typically with a wedge angle of 5° or 15°). Through cooperation with corresponding wedge-shaped sealing gaskets (seats) on the valve body, the wedge effect converts the axial force of the valve stem into a radial pressing force of the gate on the sealing surfaces, thus achieving a tight fit between the sealing surfaces. Due to its reliable sealing structure and low flow resistance, it is widely used in pipeline systems for petroleum, chemical, natural gas, and thermal power generation, and is particularly suitable for harsh conditions involving high temperature, high pressure, and media containing solid particles.

[0003] Wedge gate valves rely on the tight fit between metal sealing surfaces to achieve shut-off sealing. During long-term use, the sealing surfaces on both sides of the gate experience reciprocating frictional wear due to frequent opening and closing operations. Simultaneously, they are affected by high-temperature, high-pressure media, high-speed scouring, corrosion, and permanent deformation due to compression. This leads to increased surface roughness, altered geometry, and a gradual increase in the sealing surface gap, resulting in a decrease in the valve's sealing pressure and ultimately internal leakage. Once internal leakage occurs, it not only wastes media and pollutes the environment, but in severe cases, it can also cause major safety accidents, especially in pipelines transporting toxic, flammable, or explosive media.

[0004] Some gate valves employ a split gate structure or an elastic compensation mechanism. For example, a double-gate structure uses a wedge-connecting mechanism to dynamically distribute the pressure on the sealing surface. When wear occurs on one side of the sealing surface, the other gate can automatically adjust the contact pressure through a spring compensation mechanism, thereby extending the sealing life to some extent. However, the double-gate structure is complex in overall design, requires high machining precision, and the sealing compensation force is determined by a spring with fixed stiffness. It is impossible to manually adjust the compensation amount according to the actual wear of the sealing surface during use. When the wear exceeds the maximum compensation stroke of the spring, sealing failure will still occur. An elastic gate structure divides the gate into a main body and an elastic sealing part, using the gate's own elastic deformation to provide sealing compensation. However, the elastic deformation is limited and can only compensate for minor wear. It cannot effectively compensate for larger wear caused by long-term use, and repeated elastic deformation over a long period can easily lead to fatigue damage of the elastic structure, further reducing the valve's service life.

[0005] Furthermore, due to factors such as the flow state of the medium, particle distribution, and installation stress, the sealing surfaces on both sides of the gate often experience varying degrees of wear, resulting in a gap difference. Current compensation mechanisms typically only provide a uniform compensation displacement and cannot independently and precisely adapt to the differential wear of the sealing surfaces on both sides. This can lead to one sealing surface continuing to leak due to insufficient compensation, while the other side may experience accelerated wear due to excessive compression, creating a vicious cycle. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, this invention provides a spiral wedge-type rising stem gate valve, which has the advantage of automatically compensating for the gap difference caused by different wear on the sealing surfaces on both sides.

[0007] To achieve the above objectives, the present invention provides the following technical solution: including a valve body and a valve cover, and a gate component and a valve stem component installed in the valve body and the valve cover, wherein the gate component and the valve stem component are movably installed together, and the valve stem component extends to the outside and is threadedly installed with the valve cover for driving the sliding of the gate component; the valve body is also provided with a guide rail and a sealing gasket, and the sealing gasket cooperates with the gate component to form a seal; The gate component includes a gate sealing block, an auxiliary abutment, and a hydraulic cylinder. The gate sealing block is disposed on both end faces of the gate component. The auxiliary abutment and the hydraulic cylinder are disposed between the two gate sealing blocks. The hydraulic cylinder is embedded inside the gate sealing block and slides relative to the gate sealing block. The auxiliary abutment abuts against the inner end faces of the two gate sealing blocks, so that the two gate sealing blocks form a whole and abut against the sealing gasket for sealing.

[0008] Preferably, two sealing gaskets are provided, and the end face of the sealing gasket near the gate component is inclined. The gate component slides between the two sealing gaskets, and the outer end face of the gate component and the gate sealing block is also provided with an inclined surface that matches the sealing gasket.

[0009] Preferably, the inclined angle of the gasket, the gate component, and the gate sealing block is 0-15°.

[0010] Preferably, the gate component has an inner cavity, the gate sealing block slides within the inner cavity, and the auxiliary abutment slides between the two gate sealing blocks for force transmission between the two gate sealing blocks. The contact surface between the gate sealing block and the auxiliary abutment is set as an inclined surface. One end of the auxiliary abutment is fixed with a storage spring, which is fixed to the inner wall of the gate component. The auxiliary abutment is U-shaped, with its two feet located on both sides of the hydraulic cylinder.

[0011] Preferably, the inclination angle of the contact slope between the gate sealing block and the auxiliary abutment is 0-20°.

[0012] Preferably, a hydraulic pipe is fixed on the hydraulic cylinder, the hydraulic pipe extends through the auxiliary abutment and the gate to the valve stem, the hydraulic pipe is slidably connected to the auxiliary abutment, fixedly connected to the gate, and movably engaged with the valve stem, and the hydraulic cylinder and the hydraulic pipe are filled with hydraulic oil.

[0013] Preferably, the regulating valve stem is located at the top of the valve stem member, and a handwheel is fixed to the outer periphery of the regulating valve stem. The valve can be opened and closed by driving the valve stem member to rotate through the handwheel. The regulating valve stem is internally provided with an regulating worm gear nut, an regulating screw, a piston, and an regulating worm. The regulating worm gear nut rotates within the regulating valve stem, the regulating screw slides within the regulating valve stem, the piston is rotatably mounted on the bottom of the regulating screw and is located within the hydraulic pipe, and the regulating worm is rotatably mounted on the regulating valve stem.

[0014] Preferably, the top of the adjusting screw is provided with a limiting structure for sliding of the adjusting screw, and the outer periphery of the adjusting screw is also threaded with the inner wall of the adjusting worm gear nut, so that the adjusting screw is driven to slide by adjusting the worm gear nut.

[0015] Preferably, a portion of the adjusting worm extends to the outside and can be manually operated from the outside. The adjusting worm engages with the outer peripheral thread of the adjusting worm wheel nut.

[0016] Preferably, a guide block is also fixed on the outer periphery of the gate component, and the guide block cooperates with the guide rail to achieve the function of guiding and limiting the gate component.

[0017] Compared with the prior art, the present invention provides a spiral wedge-type rising stem gate valve, which has the following beneficial effects: 1. This spiral wedge-type rising stem gate valve, through its split gate structure and hydraulic transmission, eliminates the need to disassemble and replace the entire valve after leakage occurs due to wear or deformation. Adjustment at the top of the valve stem is sufficient to compensate for the wear-induced gaps, significantly extending the valve's overall service life and reducing operating costs. Furthermore, the sliding design of the auxiliary abutment automatically adapts to the gap difference caused by varying wear on the gate sealing gaskets on both sides, ensuring uniform force and tight fit on both sealing surfaces. This effectively avoids the need for fine-tuning due to excessive wear on one side of the sealing surface.

[0018] 2. This spiral wedge-type rising stem gate valve automatically adapts to the gap difference between the sealing blocks on both sides of the gate by relying on hydraulic oil transmission, ensuring that the sealing surfaces on both sides are always evenly stressed and tightly fitted, avoiding the problem of excessive wear on one side of the sealing surface, and also avoiding the difficulty of one-sided adjustment after wear on one side. Furthermore, the triple self-locking structure not only ensures the long-term stability of the sealing position, but also reduces the force required for adjustment, making operation easier and more convenient, and improving sealing reliability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the half-section structure of the present invention; Figure 3 This is a schematic diagram of the valve body structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the valve of the present invention; Figure 5 This is a schematic diagram of the half-section structure inside the valve of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A; Figure 7 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of a half-section of the gate component of the present invention; Figure 9 This is a schematic diagram of the auxiliary abutment structure of the present invention.

[0020] In the diagram: 10. Valve body; 101. Guide rail; 102. Sealing gasket; 11. Valve cover; 12. Handwheel; 20. Gate assembly; 201. Gate inner cavity; 202. Guide block; 21. Gate sealing block; 22. Auxiliary abutment component; 221. Storage spring; 23. Hydraulic cylinder; 231. Hydraulic pipe; 30. Valve stem assembly; 31. Adjusting valve stem; 311. Adjusting worm gear nut; 312. Adjusting screw; 313. Piston; 314. Adjusting worm gear. Detailed Implementation

[0021] 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.

[0022] like Figure 1-9As shown, the valve includes a valve body 10 and a valve cover 11, as well as a gate member 20 and a valve stem member 30 installed within the valve body 10 and valve cover 11. The gate member 20 and the valve stem member 30 are movably mounted together, and the valve stem member 30 extends to the outside and is threadedly mounted to the valve cover 11 for driving the gate member 20 to slide. A nut sealing block is fixed to the top of the valve cover 11. After the valve stem member 30 is threadedly engaged with the nut sealing block, the valve stem member 30 can drive the gate member 20 upward through its own rotation. The valve body 10 moves downwards, and the valve cover 11 is fixed together with the valve body 10 by bolts. The connection surface is sealed by a sealing ring to prevent the medium from leaking from the interface between the valve cover 11 and the valve body 10. The valve body 10 also has a guide rail 101 and a sealing gasket 102 inside. The sealing gasket 102 cooperates with the gate component 20 to form a seal. The outer periphery of the gate component 20 is also fixed with a guide block 202. The guide block 202 cooperates with the guide rail 101 to guide and limit the gate component 20. The cooperation between the guide block and the guide rail can prevent the gate from shifting or misaligning during the sliding process, further ensuring the alignment accuracy of the sealing surface and reducing the possibility of additional wear. The sealing gasket on the valve body can directly cooperate with the gate component to form a seal.

[0023] The gate component 20 includes a gate sealing block 21, an auxiliary abutment 22, and a hydraulic cylinder 23. The gate sealing block 21 is located on both end faces of the gate component 20. The auxiliary abutment 22 and the hydraulic cylinder 23 are both located between the two gate sealing blocks 21. The hydraulic cylinder 23 is embedded inside the gate sealing block 21 and slides relative to the gate sealing block 21. There is a sealing ring between them. The auxiliary abutment 22 abuts against the inner end faces of the two gate sealing blocks 21, making the two gate sealing blocks 21 form a whole and abut against the sealing gasket 102 for sealing. The split gate structure allows the sealing surfaces on both sides to adaptively adjust their mating positions, reducing the requirements for the overall adjustment accuracy of the gate. At the same time, it can always ensure that the sealing surfaces on both sides are evenly fitted with the valve seat sealing surface, avoiding the problem of excessive wear and sealing failure on one side of the sealing surface, which requires fine adjustment.

[0024] Two sealing gaskets 102 are provided, and the end face of the sealing gasket 102 near the gate component 20 is inclined. The gate component 20 slides between the two sealing gaskets 102. The outer end faces of the gate component 20 and the gate sealing block 21 are also provided with inclined surfaces that match the sealing gaskets 102. The inclination angle of the inclined surfaces of the sealing gaskets 102, the gate component 20, and the gate sealing block 21 is 0-15°. This is the structure of a wedge gate valve, which achieves a tight seal through the wedge structure.

[0025] The gate component 20 has an inner cavity 201. The gate sealing block 21 slides within the inner cavity 201, and the auxiliary abutment 22 slides between the two gate sealing blocks 21 for force transmission between them. The contact surface between the gate sealing block 21 and the auxiliary abutment 22 is inclined. One end of the auxiliary abutment 22 is fixed with a storage spring 221, which is fixed to the inner wall of the gate component 20. The storage spring 221 is always in a stored state. In this configuration, the auxiliary abutment 22 is U-shaped, with its two feet located on either side of the hydraulic cylinder 23. The inclination angle of the contact slope between the gate sealing block 21 and the auxiliary abutment 22 is 0-20°. Through the inclined surface cooperation, when the gate sealing block 21 expands to both sides, it can adaptively fit against the inner wall of the gate sealing blocks 21 on both sides, ensuring that the force transmission is always in a stable state. This allows it to maintain sufficient pre-tightening force during long-term use, maintain a stable sealing effect, and prevent media leakage. At the same time, the guide block 202 and the guide rail 101 guide and limit cooperation prevent the seal from shifting or misaligning during opening and closing.

[0026] A hydraulic pipe 231 is fixed on the hydraulic cylinder 23. The hydraulic pipe 231 passes through the auxiliary abutment 22 and the gate component 20 and extends into the valve stem component 30. The hydraulic pipe 231 is slidably connected to the auxiliary abutment 22, fixedly connected to the gate component 20, and movably engaged with the valve stem component 30. The hydraulic cylinder 23 and the hydraulic pipe 231 are filled with hydraulic oil. Through hydraulic transmission, it is not necessary to adjust the moving distance of a single gate sealing block 21; only the distance between the two gate sealing blocks 21 needs to be adjusted. When the valve is closed, that is, when the gate component 20 is closed, the sealing gaskets 10 on both sides... 2. Due to limitations, the gate sealing block 21 will automatically adjust to a suitable position. If the wear on the left side is less and the wear on the right side is greater, after adjusting the two gate sealing blocks 21 to a suitable distance, closing the valve will cause the left sealing gasket 102 to push against the left gate sealing block 21 to the right. This will push the entire auxiliary abutment 22 and the gate sealing block 21 to the right (there is a certain margin between the auxiliary abutment 22, the gate component 20, and the hydraulic pipe 231, allowing the auxiliary abutment 22 to slide a small distance), automatically compensating for the difference in wear without the need for precise adjustment. Therefore, hydraulic transmission can effectively compensate for the gap difference caused by wear, avoiding the problem of incomplete sealing due to wear on one side, which requires fine adjustment.

[0027] The regulating valve stem 31 is located at the top of the valve stem 30. A handwheel 12 is fixed to the outer periphery of the regulating valve stem 31. The valve stem 30 can be rotated by the handwheel 12 to open and close the gate valve 20. The regulating valve stem 31 is equipped with an regulating worm gear nut 311, a regulating screw 312, a piston 313, and a regulating worm 314. The regulating worm gear nut 311 rotates inside the regulating valve stem 31, the regulating screw 312 slides inside the regulating valve stem 31, the piston 313 is rotatably mounted at the bottom of the regulating screw 312 and is located inside the hydraulic pipe 231, and the regulating worm 314 is rotatably mounted on the regulating valve stem 31. The top of the regulating screw 312 is provided with a limit structure for adjusting the sliding of the screw 312. The outer periphery of the regulating screw 312 is also threaded with the inner wall of the regulating worm gear nut 311. The regulating worm gear nut 311 drives the regulating screw 312 to slide. The two work together to form a screw and nut pair, forming a preliminary self-locking mechanism.

[0028] When the adjusting screw 312 slides downwards, it pushes the piston 313 downwards, squeezing the hydraulic oil in the hydraulic pipe 231 and causing the two gate sealing blocks 21 to expand outwards. Conversely, when the adjusting screw 312 slides upwards, the hydraulic oil pressure decreases, and the two gate sealing blocks 21 can contract inwards. The characteristics of hydraulic transmission ensure that the force on the two gate sealing blocks 21 is always uniform, improving the stability of the seal. The initial self-locking mechanism formed by the screw and nut assembly, combined with the hydraulic oil pressure maintenance, stably maintains the position of the two gate sealing blocks 21 after adjustment.

[0029] The adjusting worm 314 extends to the outside and can be manually operated from the outside. The adjusting worm 314 engages with the outer circumferential thread of the adjusting worm wheel nut 311, and the two cooperate to form a worm wheel pair, which can form a self-locking mechanism again. At the same time, it saves the force of rotating the adjusting worm 314, making it easier to adjust. Through the initial self-locking of the screw nut pair, the secondary self-locking of the worm wheel pair, and the triple self-locking design of hydraulic oil pressure maintenance, it can not only ensure the long-term stability of the sealing disc position and prevent the seal from loosening due to the impact of valve medium pressure, but also avoid the problem of difficult adjustment, making it easy to operate. It can also ensure that the double-sided seal is subjected to uniform force at all times, avoiding the problem of premature wear of the single-sided seal, effectively improving the sealing reliability and service life of the valve.

[0030] Working principle: During use, rotating the handwheel 12 causes the valve stem 30 to rotate relative to the top of the valve cover 11. Then, the gate 20 can move up and down with the cooperation of the guide rail 101 and the guide block 202, thus cutting off the medium in the valve and realizing the opening and closing function of the gate valve. The sealing between the two gate sealing blocks 21 on both sides of the gate 20 and the two sealing gaskets 102 ensures that the valve can effectively seal the medium and prevent the medium from flowing into the other side of the valve body.

[0031] After prolonged use, the gate component 20 and the sealing gasket 102 undergo permanent deformation due to frictional wear or compression, resulting in poor valve sealing performance and leakage. To improve the valve's sealing performance, the operator rotates the adjusting worm gear 314, causing the adjusting worm wheel nut 311 to rotate. This rotation drives the adjusting screw 312 downwards, which in turn squeezes the hydraulic oil in the hydraulic pipe 231 via the piston 313. This causes the gate sealing blocks 21 on both sides to slide away from the hydraulic pipe 231, adjusting the distance between them. This adjustment fills the gap between the gate sealing block 21 and the sealing gasket 102, restoring the sealing performance and allowing continued use until the gate sealing block 21 and the sealing gasket 102 are completely damaged. Then, the valve needs to be replaced, significantly extending its service life.

[0032] After the two gate sealing blocks 21 slide, the stored force spring 221 will automatically push the auxiliary abutment 22 downward to fill the sliding distance of the two gate sealing blocks 21, so that the auxiliary abutment 22 can always fit against the inner end face of the two gate sealing blocks 21, providing force transmission for the two gate sealing blocks 21. That is, when the gate component 20 closes the valve, the pressure generated by the medium will not act on the hydraulic cylinder 23, but mainly act on the gate sealing block 21 and the sealing gaskets 102 on both sides, avoiding excessive pressure in the internal hydraulic pipe 231 that could lead to hydraulic oil leakage.

[0033] If the auxiliary abutment 22 needs to be reset, remove the gate plate. The gate plate 20 has a reset hole at its bottom. Use a tool to abut against the auxiliary abutment 22 to push the auxiliary abutment 22 to compress the storage spring 221. At this time, there will be a gap between the gate sealing blocks 21 on both sides and the auxiliary abutment 22. Then rotate the adjusting worm gear 314 to allow the gate sealing blocks 21 on both sides to slide inward during hydraulic transmission, thereby resetting the valve so that it can be used again.

[0034] In summary, this spiral wedge-type rising stem gate valve, through its split gate structure and hydraulic transmission, eliminates the need for complete valve disassembly and replacement after leakage occurs due to wear or deformation. Adjustment at the top of the valve stem is sufficient to compensate for the wear-induced gaps, significantly extending the valve's overall service life and reducing operating costs. Furthermore, the hydraulic transmission automatically adapts to the gap difference between the two gate sealing blocks, ensuring uniform and tight contact on both sealing surfaces. This avoids excessive wear on one side and the difficulty of adjustment on the other side after wear. The triple self-locking structure ensures long-term stability of the sealing position while reducing the force required for adjustment, making operation easier and more convenient, and resulting in higher sealing reliability.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spiral wedge-type rising stem gate valve, comprising a valve body (10) and a valve cover (11), and a gate member (20) and a valve stem member (30) installed in the valve body (10) and the valve cover (11), wherein the gate member (20) and the valve stem member (30) are movably mounted together, and the valve stem member (30) extends to the outside and is threadedly mounted to the valve cover (11) for driving the sliding of the gate member (20), characterized in that: The valve body (10) is also provided with a guide rail (101) and a sealing gasket (102), and the sealing gasket (102) cooperates with the gate component (20) to form a seal; The gate component (20) includes a gate sealing block (21), an auxiliary abutment (22), and a hydraulic cylinder (23). The gate sealing block (21) is located on both ends of the gate component (20). The auxiliary abutment (22) and the hydraulic cylinder (23) are both located between the two gate sealing blocks (21). The hydraulic cylinder (23) is embedded inside the gate sealing block (21) and slides relative to the gate sealing block (21). The auxiliary abutment (22) abuts against the inner ends of the two gate sealing blocks (21), so that the two gate sealing blocks (21) form a whole and abut against the sealing gasket (102) for sealing.

2. The spiral wedge-type rising stem gate valve according to claim 1, characterized in that: Two sealing gaskets (102) are provided, and the end face of the sealing gasket (102) near the gate component (20) is set with an incline. The gate component (20) slides between the two sealing gaskets (102), and the outer end face of the gate component (20) and the gate sealing block (21) is also provided with an inclined surface that matches the sealing gasket (102).

3. A spiral wedge-type rising stem gate valve according to claim 2, characterized in that: The inclined angles of the gasket (102), the gate component (20) and the gate sealing block (21) are (0)-(15)°.

4. A spiral wedge-type rising stem gate valve according to claim 1, characterized in that: The gate component (20) has a gate cavity (201) inside, the gate sealing block (21) slides in the gate cavity (201), and the auxiliary abutment (22) slides between the two gate sealing blocks (21) for the transmission of force between the two gate sealing blocks (21). The contact surface between the gate sealing block (21) and the auxiliary abutment (22) is set as an inclined surface. One end of the auxiliary abutment (22) is fixed with a power storage spring (221), which is fixed to the inner wall of the gate (20) by the power storage spring (221). The auxiliary abutment (22) is U-shaped, and its two feet are located on both sides of the hydraulic cylinder (23).

5. A spiral wedge-type rising stem gate valve according to claim 4, characterized in that: The inclination angle of the contact slope between the gate sealing block (21) and the auxiliary abutment (22) is (0) - gate part (20)°.

6. A spiral wedge-type rising stem gate valve according to claim 1, characterized in that: A hydraulic pipe (231) is fixed on the hydraulic cylinder (23). The hydraulic pipe (231) extends through the auxiliary abutment (22) and the gate (20) into the valve stem (30). The hydraulic pipe (231) is slidably connected to the auxiliary abutment (22), fixedly connected to the gate (20), and movably engaged with the valve stem (30). The hydraulic cylinder (23) and the hydraulic pipe (231) are filled with hydraulic oil.

7. A spiral wedge-type rising stem gate valve according to claim 6, characterized in that: The regulating valve stem (31) is located at the top of the valve stem (30). A handwheel (12) is also fixed on the outer periphery of the regulating valve stem (31). The valve stem (30) can be rotated by driving the handwheel (12) to open and close the valve. The regulating valve stem (31) is internally provided with an regulating worm gear nut (311), an regulating screw (312), a piston (313), and an regulating worm (314). The regulating worm gear nut (311) rotates inside the regulating valve stem (31), the regulating screw (312) slides inside the regulating valve stem (31), the piston (313) is rotatably mounted on the bottom of the regulating screw (312), and the piston (313) is located inside the hydraulic pipe (231). The regulating worm (314) is rotatably mounted on the regulating valve stem (31).

8. A spiral wedge-type rising stem gate valve according to claim 7, characterized in that: The top of the adjusting screw (312) is provided with a limiting structure for sliding of the adjusting screw (312). The outer periphery of the adjusting screw (312) is also threaded with the inner wall of the adjusting worm gear nut (311), and the adjusting screw (312) is driven to slide by adjusting the worm gear nut (311).

9. A spiral wedge-type rising stem gate valve according to claim 7, characterized in that: Part of the adjusting worm (314) extends to the outside and can be manually operated from the outside. The adjusting worm (314) engages with the outer peripheral thread of the adjusting worm wheel nut (311).

10. A spiral wedge-type rising stem gate valve according to claim 1, characterized in that: A guide block (202) is also fixed on the outer periphery of the gate component (20). The guide block (202) cooperates with the guide rail (101) to guide and limit the gate component (20).

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