High-pressure gate valve

Abstract

The invention relates to the technical field of control valves, in particular to a high-pressure gate valve which comprises a nut sleeve, an upper valve rod, a connecting plate and a lower valve rod, and the nut sleeve can rotate around the axis of the nut sleeve; the upper end of the upper valve rod is connected with the nut sleeve, and the nut sleeve rotates to drive the upper valve rod to ascend and descend. The lower end of the upper valve rod is connected with the connecting plate, and the upper valve rod can drive the connecting plate to ascend and descend. The upper end of the lower valve rod is connected with the connecting plate, and the connecting plate can drive the lower valve rod to ascend and descend. Wherein a first necking section is arranged at the lower end of the upper valve rod, at least one plane is arranged on the periphery of the first necking section, and the connecting plate clamps the first necking section to achieve connection with the upper valve rod. By arranging the upper valve rod and the lower valve rod, the risk that the valve rod is bent due to the fact that the valve rod is too long can be avoided, and the problem that a nut sleeve is prone to abrasion is solved.

Description

Technical Field

[0001] This disclosure relates to the field of control valve technology, and in particular to a high-pressure gate valve. Background Technology

[0002] Currently, the copper nut sleeves on high-pressure valves in water supply systems use spring assistance to apply preload, making disassembly complex. The valve stem and drive thread are integrated; however, due to the high pressure and long valve stem in water supply systems, the valve core and drive orifice plate experience unilateral stress during valve opening and closing. This can cause misalignment between the valve stem thread and the copper nut sleeve, resulting in unilateral stress on the copper nut sleeve during operation and rapid wear. Summary of the Invention

[0003] This disclosure is made in view of the above-mentioned problems. This disclosure provides a high-pressure gate valve.

[0004] According to one aspect of this disclosure, a high-pressure gate valve is provided, comprising: A nut sleeve, the nut sleeve being rotatable about its axis; An upper valve stem, the upper end of which is connected to the nut sleeve, and the rotation of the nut sleeve can drive the upper valve stem to rise and fall; A connecting plate is provided, the lower end of the upper valve stem is connected to the connecting plate, and the upper valve stem can drive the connecting plate to rise and fall; The lower valve stem has its upper end connected to the connecting plate, and the connecting plate can drive the lower valve stem to rise and fall. The upper valve stem has a first constricted section at its lower end, and the outer periphery of the first constricted section has at least one flat surface. The connecting plate clamps the first constricted section to achieve connection with the upper valve stem.

[0005] Furthermore, according to one aspect of the high-pressure gate valve of this disclosure, the upper end of the lower valve stem is provided with a second constricted section, the outer periphery of the second constricted section is provided with at least one flat surface, and the connecting plate clamps the second constricted section to achieve connection with the lower valve stem.

[0006] Furthermore, according to one aspect of the high-pressure gate valve of this disclosure, the upper end of the lower valve stem is provided with a threaded section, and the connecting plate clamps the threaded section to achieve connection with the lower valve stem.

[0007] Furthermore, the high-pressure gate valve according to one aspect of this disclosure also includes: A connecting seat has a receiving cavity in the middle, and the nut sleeve is disposed in the receiving cavity and can rotate in the receiving cavity. The lower port of the receiving cavity is provided with an inner convex ring along the radial direction to limit the nut sleeve from below. A cover plate is disposed on the top of the connecting seat, covering the upper port of the receiving cavity and limiting the nut sleeve from above.

[0008] Furthermore, according to one aspect of the high-pressure gate valve of this disclosure, the nut sleeve includes a cylindrical body, the cylindrical body having a threaded hole along its axis, the threaded hole being a through hole, and the upper end of the upper valve stem being threadedly connected to the threaded hole.

[0009] Furthermore, the high-pressure gate valve according to one aspect of this disclosure also includes: An electric actuator is disposed above the connecting seat and is detachably and fixedly connected to the connecting seat. The upper end of the cylinder is provided with a spline, or a spline is provided near the outer periphery of the upper end. The electric actuator is connected through the spline and can drive the nut sleeve to rotate.

[0010] Furthermore, the high-pressure gate valve according to one aspect of this disclosure also includes: At least two bearings, wherein the bearings are thrust bearings, and the bearings are sleeved on the cylinder; The outer circumference of the cylinder is provided with an outer convex ring along the radial direction, and the outer convex ring is used to abut against the bearing.

[0011] Furthermore, the high-pressure gate valve according to one aspect of this disclosure also includes: Valve body, wherein the valve body is provided with a channel; A valve seat, wherein the valve seat is disposed in the middle of the channel; A gate is disposed on the valve seat and can be raised and lowered within the valve seat to control the interruption of the channel. The lower end of the lower valve stem is connected to the gate and can drive the gate to rise and fall.

[0012] Furthermore, the high-pressure gate valve according to one aspect of this disclosure also includes: At least two support rods are provided, with the lower end of the support rod connected to the valve body and the upper end connected to the connecting seat. The support rods are connected to the side of the connecting plate, and the support rods guide the lifting and lowering of the connecting plate.

[0013] Furthermore, in the high-pressure gate valve according to one aspect of this disclosure, the nut sleeve is made of aluminum bronze or stainless steel.

[0014] According to the high-pressure gate valve of this disclosure, by segmenting the valve stem into an upper valve stem and a lower valve stem, and connecting the upper and lower valve stems through a connecting plate, the risk of bending due to excessive valve stem length can be avoided. It can also play a role in fine-tuning the misalignment of the valve stem and the nut sleeve, avoiding the problem of accelerated wear of the nut sleeve due to unilateral force caused by misalignment during the opening and closing of the gate valve, thus ensuring the opening and closing effect of the gate valve and extending the service life of the gate valve.

[0015] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0016] The above and other objects, features, and advantages of this disclosure will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the disclosure and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1 This is a cross-sectional schematic diagram of a high-pressure gate valve according to an embodiment of the present disclosure; Figure 2 This is a cross-sectional schematic diagram of a connecting plate according to an embodiment of the present disclosure; Figure 3 This is a partial cross-sectional schematic diagram of a high-pressure gate valve according to an embodiment of the present disclosure; Figure 4 This is a cross-sectional schematic diagram of a nut sleeve according to an embodiment of the present disclosure; Figure 5 This is a top view of a nut sleeve according to an embodiment of the present disclosure; Figure 6 for Figure 5 Sectional view along the middle AA.

[0018] Explanation of reference numerals in the attached figures: 100: High-pressure gate valve; 1: Handwheel; 2: Electric actuator; 3: Nut sleeve; 31: Cylinder; 32: Threaded hole; 33: Outer convex ring; 34: Spline; 35: Spline; 4: Connecting seat; 41: Inner convex ring; 5: Cover plate; 6: Upper valve stem; 61: First necking section; 7: Support rod; 8: Connecting plate; 9: Lower valve stem; 91: Second necking section; 92: Threaded section; 10: Gland; 11: Gland sleeve; 12: First sealing packing; 13: Packing gasket; 14: Compression nut; 15: Valve cover; 16: Limit ring; 17: Valve core; 18: Pressure ring; 19: Second sealing packing; 20: Valve body; 21: Channel; 22: Gate; 23: Valve seat; 24: Bearing. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this disclosure more apparent, exemplary embodiments according to this disclosure will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this disclosure, and not all embodiments of this disclosure. It should be understood that this disclosure is not limited to the exemplary embodiments described herein.

[0020] This disclosure provides a high-pressure gate valve that solves the problem of easy wear of the nut copper sleeve and the problem of the valve being unable to open due to wear of the nut copper sleeve.

[0021] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0022] like Figure 1 , Figure 2 As shown, this embodiment of the present disclosure provides a high-pressure gate valve 100, including: a nut sleeve 3, an upper valve stem 6, a connecting plate 8, and a lower valve stem 9; The nut sleeve 3 can rotate around its axis, which is usually in the up-down direction. It can rotate clockwise and counterclockwise, which correspond to opening or closing respectively. When the nut sleeve 3 rotates, its height in the high-pressure gate valve 100 does not change. The upper valve stem 6 is located below the nut sleeve 3. The upper end of the upper valve stem 6 is connected to the nut sleeve 3. The rotation of the nut sleeve 3 can drive the upper valve stem 6 to rise and fall. When the nut sleeve 3 rotates, the upper valve stem 6 cannot rotate and is forced to rise and fall under the action of the thread. The connecting plate 8 is located below the upper valve stem 6. The lower end of the upper valve stem 6 is connected to the connecting plate 8, and the upper valve stem 6 can drive the connecting plate 8 to rise and fall. The connecting plate 8 usually includes two clamping plates, which are combined with bolts to clamp and fix the lower end of the upper valve stem 6. The lower valve stem 9 is located below the connecting plate 8, and the upper end of the lower valve stem 9 is connected to the connecting plate 8. The connecting plate 8 can drive the lower valve stem 9 to rise and fall. The lower valve stem 9 and the upper valve stem 6 are usually coaxial, but they are also allowed to be non-coaxial. Slight deviation is acceptable and will not affect their synchronous rise and fall. The upper valve stem 6 has a first necked section 61 at its lower end. The outer periphery of the first necked section 61 has at least one flat surface. The connecting plate 8 clamps the first necked section 61 to connect with the upper valve stem 6. The connecting plate 8 has a corresponding snap-fit ​​hole.

[0023] The first constricted section 61 can be generally cylindrical, with at least one flat surface on its outer periphery, so that it can form a snap-fit ​​structure with the connecting plate 8. Preferably, two symmetrical flat surfaces are provided. The upper valve stem 6 drives the connecting plate 8 to rise and fall, and the connecting plate 8 can also prevent the upper valve stem 6 from rotating. The first constricted section 61 can be a prism structure, such as a square prism, a hexagonal prism, etc., so that it can also form a snap-fit ​​structure with the connecting plate 8, and the connecting plate 8 can also prevent the upper valve stem 6 from rotating.

[0024] In this embodiment, the high-pressure gate valve 100 has a segmented valve stem, consisting of an upper valve stem and a lower valve stem, which are connected by a connecting plate. This design avoids the risk of bending due to excessive valve stem length and also allows for fine-tuning of misalignment between the valve stem and the nut sleeve. This prevents the nut sleeve from being subjected to unilateral force and accelerated wear during the opening and closing of the gate valve due to misalignment, ensuring the effective opening and closing of the gate valve and extending its service life.

[0025] In some possible implementations, such as Figure 1 , Figure 2 As shown, the upper end of the lower valve stem 9 is provided with a second constricted section 91. The outer periphery of the second constricted section 91 is provided with at least one flat surface. The connecting plate 8 clamps the second constricted section 91 to achieve connection with the lower valve stem 9. The connecting plate 8 is provided with a corresponding snap-fit ​​hole.

[0026] The second necked section 91 can be generally cylindrical, with at least one flat surface on its outer periphery, so that it can form a snap-fit ​​structure with the connecting plate 8. Preferably, two symmetrical flat surfaces are provided. The second necked section 91 can be prism, such as a quadrangular prism, a hexagonal prism, etc., so that it can also form a snap-fit ​​structure with the connecting plate 8. The connecting plate 8 drives the lower valve stem 9 to rise and fall.

[0027] In some possible implementations, such as Figure 3 As shown, the upper end of the lower valve stem 9 is provided with a threaded section 92, and the connecting plate 8 clamps the threaded section 92 to achieve connection with the lower valve stem 9. The connecting plate 8 is provided with a corresponding threaded hole.

[0028] Since the connecting plate 8 only performs lifting and lowering movements, even if the connecting plate 8 is threadedly connected to the upper end of the lower valve stem 9, it can still drive the lower valve stem 9 to lift and lower.

[0029] In some possible implementations, such as Figure 1 , Figure 3 As shown, the high-pressure gate valve 100 also includes: a connecting seat 4 and a cover plate 5; The middle part of the connecting seat 4 is provided with a receiving cavity, the nut sleeve 3 is disposed in the receiving cavity and can rotate in the receiving cavity, and the lower port of the receiving cavity is provided with an inner convex ring 41 along the radial direction to limit the nut sleeve 3 from below; the shape of the receiving cavity is provided to correspond to the nut sleeve 3, and the nut sleeve 3 can rotate in the receiving cavity but does not wobble; The cover plate 5 is located on the top of the connecting seat 4, covering the upper port of the receiving cavity and limiting the nut sleeve 3 from above. The cover plate 5 and the connecting seat 4 are combined by bolts.

[0030] In some possible implementations, such as Figure 4 , Figure 5 , Figure 6As shown, the nut sleeve 3 includes a cylindrical body 31, and the cylindrical body 31 is provided with a threaded hole 32 along its axis. The threaded hole 32 is a through hole, and the upper end of the upper valve stem 6 is threadedly connected to the threaded hole 32. The through hole facilitates the movement of the upper end of the upper valve stem 6 within it. The thread can be a trapezoidal thread, which is beneficial for forming a threaded drive relationship.

[0031] In some possible implementations, such as Figure 1 As shown, the high-pressure gate valve 100 also includes an electric actuator 2, which enables the high-pressure gate valve 100 to achieve automatic control. The electric actuator 2 is positioned above the connecting base 4 and is detachably and fixedly connected to the connecting base 4, which can be achieved by bolts, such as... Figure 4 As shown, the upper end of the cylinder 31 is provided with a spline 34, or as... Figure 5 , Figure 6 As shown, a spline 35 is provided on the outer periphery near the upper end. The spline is a transmission mechanism that connects to the electric actuator 2. The electric actuator 2 can drive the nut sleeve 3 to rotate.

[0032] In some possible implementations, such as Figure 1 As shown, the high-pressure gate valve 100 also includes a handwheel 1, enabling manual control of the high-pressure gate valve 100. In the event of a power outage or failure of the electric actuator 2, the high-pressure gate valve 100 can be manually opened and closed.

[0033] In some possible implementations, such as Figure 1 , Figure 3 As shown, the high-pressure gate valve 100 also includes at least two bearings 24, which are thrust bearings and are sleeved on the cylinder 31. The outer periphery of the cylinder 31 is provided with an outer convex ring 33 along the radial direction, which is used to abut against the bearing 24.

[0034] The upper bearing 24 is located between the cover plate 5 and the outer convex ring 33, and the lower bearing 24 is located between the inner convex ring 41 and the outer convex ring 33. The two bearings 24 support the rotation of the nut sleeve 3 from the upper and lower parts respectively, ensuring that the nut sleeve 3 rotates smoothly and does not generate friction between it and the cover plate 5 and the connecting seat 4.

[0035] In some possible implementations, such as Figure 1 As shown, the high-pressure gate valve 100 also includes: a valve body 20, a valve seat 23, and a gate 22; The valve body 20 is provided with a channel 21, through which liquid passes. The flow of liquid can be controlled by controlling the opening and closing of the channel 21. Valve seat 23 is located in the middle of channel 21, and valve seat 23 is directly opposite the lower valve stem 9 above; Gate 22 is disposed on valve seat 23 and can move up and down in valve seat 23 to control the interruption of channel 21. The lower end of lower valve stem 9 is connected to gate 22 and can drive gate 22 to move up and down.

[0036] Gate 22 rises to open channel 21, and gate 22 falls to close channel 21.

[0037] In some possible implementations, such as Figure 1 , Figure 3 As shown, the high-pressure gate valve 100 also includes: There are at least two support rods 7. The lower end of the support rod 7 is connected to the valve body 20, and the upper end is connected to the connecting seat 4. The side of the connecting plate 8 is connected to the support rod 7, and the support rod 7 guides the lifting and lowering of the connecting plate 8.

[0038] The connecting plate 8 is positioned between the two support rods 7. The side of the connecting plate 8 is provided with a guide groove or guide hole corresponding to the support rods 7. The two support rods 7 restrict the connecting plate 8 to only lift up and down and not rotate.

[0039] In some possible implementations, the nut sleeve 3 is made of aluminum bronze or stainless steel. The aluminum bronze can be ZQAL9-4, and the stainless steel can be 20Cr13.

[0040] In some possible implementations, such as Figure 1 As shown, the high-pressure gate valve 100 also includes a sealing assembly, which seals the gap between the lower valve stem 9 and the valve body 20 to prevent liquid leakage from the gap. The nut sleeve 3 is located above the sealing assembly and is not within the sealing space, so if the nut sleeve 3 needs to be replaced, there is no need to consider isolating the high-pressure liquid, making maintenance very convenient.

[0041] like Figure 1 As shown, the sealing assembly includes a valve cover 15 and a valve core 17. A valve chamber is provided on the upper part of the valve body 20. The lower valve stem 9 is located in the valve chamber, and the valve core 17 is also provided in the valve chamber. The lower valve stem 9 passes through the valve core 17. A through hole is provided in the middle of the valve core 17. The valve cover 15 covers the top of the valve chamber.

[0042] A clamping nut 14 is provided on the top of the valve cover 15 to connect with the valve core 17, and a limit ring 16 is provided on the inner wall of the valve chamber to limit the valve core 17, thereby realizing the installation and fixation of the valve core 17.

[0043] A first sealing packing 12 is provided between the inner wall of the through hole in the middle of the valve core 17 and the lower valve stem 9. A packing pad 13 is provided below the first sealing packing 12. A pressure sleeve 11 and a pressure cap 10 are provided above the first sealing packing 12 for fastening, which can ensure the sealing effect here.

[0044] A second sealing packing 19 is provided between the valve core 17 and the inner wall of the valve chamber. A pressure ring 18 is provided above the second sealing packing 19. The pressure ring 18 is also tightened by the limit ring 16, which can ensure the sealing effect here.

[0045] The high-pressure gate valve according to an embodiment of the present disclosure has been described above with reference to the accompanying drawings and has the following advantages: By segmenting the valve stem into an upper and a lower stem, which are connected by a connecting plate, the risk of bending due to excessive valve stem length can be avoided. This also allows for fine-tuning of misalignment between the valve stem and the nut sleeve, preventing accelerated wear of the nut sleeve due to unilateral force caused by misalignment during the opening and closing of the gate valve. This ensures the effective opening and closing of the gate valve and extends its service life.

[0046] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0047] The block diagrams of devices, apparatuses, devices, and systems disclosed herein are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0048] Additionally, as used herein, the "or" used in a list of items beginning with "at least one" indicates a separate list, such that a list of, for example, "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not imply that the described example is preferred or better than other examples.

[0049] It should also be noted that in the system disclosed herein, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions to this disclosure.

[0050] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.

[0051] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0052] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A high-pressure gate valve, characterized in that, include: Nut sleeve (3), the nut sleeve (3) is rotatable about its axis; Upper valve stem (6), the upper end of which is connected to the nut sleeve (3), the rotation of the nut sleeve (3) can drive the upper valve stem (6) to rise and fall; The connecting plate (8) is connected to the lower end of the upper valve stem (6), and the upper valve stem (6) can drive the connecting plate (8) to rise and fall; The lower valve stem (9) is connected to the connecting plate (8) at its upper end. The connecting plate (8) can drive the lower valve stem (9) to rise and fall. The upper valve stem (6) has a first constricted section (61) at its lower end. The outer periphery of the first constricted section (61) has at least one flat surface. The connecting plate (8) clamps the first constricted section (61) to achieve connection with the upper valve stem (6).

2. The high-pressure gate valve according to claim 1, characterized in that, The upper end of the lower valve stem (9) is provided with a second constricted section (91), and the outer periphery of the second constricted section (91) is provided with at least one flat surface. The connecting plate (8) clamps the second constricted section (91) to achieve connection with the lower valve stem (9).

3. The high-pressure gate valve according to claim 1, characterized in that, The upper end of the lower valve stem (9) is provided with a threaded section (92), and the connecting plate (8) clamps the threaded section (92) to achieve connection with the lower valve stem (9).

4. The high-pressure gate valve according to claim 1, characterized in that, Also includes: The connecting seat (4) has a receiving cavity in the middle, the nut sleeve (3) is disposed in the receiving cavity and can rotate in the receiving cavity, and the lower port of the receiving cavity is provided with an inner convex ring (41) along the radial direction to limit the nut sleeve (3) from below; Cover plate (5), which is disposed on the top of the connecting seat (4), covers the upper port of the receiving cavity and limits the nut sleeve (3) from above.

5. The high-pressure gate valve according to claim 4, characterized in that, The nut sleeve (3) includes a cylinder (31), and the cylinder (31) is provided with a threaded hole (32) along its axis. The threaded hole (32) is a through hole, and the upper end of the upper valve stem (6) is threadedly connected to the threaded hole (32).

6. The high-pressure gate valve according to claim 5, characterized in that, Also includes: Electric actuator (2) is located above the connecting seat (4) and is detachably and fixedly connected to the connecting seat (4). The upper end of the cylinder (31) is provided with a spline, or a spline is provided on the outer periphery near the upper end. The electric actuator (2) is connected through the spline. The electric actuator (2) can drive the nut sleeve (3) to rotate.

7. The high-pressure gate valve according to claim 5, characterized in that, Also includes: At least two bearings (24), the bearings (24) being thrust bearings, the bearings (24) being sleeved on the cylinder (31). The outer periphery of the cylinder (31) is provided with an outer convex ring (33) in the radial direction, and the outer convex ring (33) is used to abut against the bearing (24).

8. The high-pressure gate valve according to claim 4, characterized in that, Also includes: Valve body (20), wherein the valve body (20) is provided with a channel (21); Valve seat (23), the valve seat (23) is disposed in the middle of the channel (21); A gate (22) is disposed on the valve seat (23) and can be raised and lowered in the valve seat (23) to control the interruption of the channel (21). The lower end of the lower valve stem (9) is connected to the gate (22) and can drive the gate (22) to rise and fall.

9. The high-pressure gate valve according to claim 8, characterized in that, Also includes: At least two support rods (7) are provided, with the lower end of the support rod (7) connected to the valve body (20) and the upper end connected to the connecting seat (4). The side of the connecting plate (8) is connected to the support rod (7), and the support rod (7) guides the lifting and lowering of the connecting plate (8).

10. The high-pressure gate valve according to any one of claims 1-9, characterized in that, The nut sleeve (3) is made of aluminum bronze or stainless steel.

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