A sealing structure for a valve

Abstract

The present invention belongs to the field of hydraulic valves and specifically relates to a sealing structure for a valve. The valve comprises at least a valve body and a valve stem. The sealing structure is installed within the valve and includes a valve seat, a valve sleeve, and a valve core assembly. The valve seat is disposed within the valve body, the valve sleeve being disposed at the upper end of the valve seat. The valve sleeve has a plurality of throttle holes evenly distributed along its outer circumference on a side adjacent to the valve seat. The valve core assembly is mounted within the interior space formed by the valve sleeve and the valve seat. The valve core assembly is provided with a guide portion, and the valve seat is provided with a valve seat guide surface that cooperates with the guide portion. The guide portion and the valve seat guide surface are used to guide a fluid medium to flush impurities deposited on the valve seat or the throttle holes. This sealing structure enables the fluid medium to effectively flush impurities deposited on the sealing structure, thereby improving the sealing performance of the valve.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic valves, and in particular relates to a sealing structure for valves. Background Art

[0002] Pipelines for natural gas, liquefied gas, petroleum, aviation kerosene, water, and other corrosive and non-corrosive media often require specialized valves for draining and shutting off the media. When the valve is opened for draining, the media flows through the valve's sealing structure, often containing particulate impurities. Existing valves easily deposit impurities in the sealing structure, making it difficult for the fluid medium to effectively flush away these impurities even when the valve is open. Furthermore, the sealing element in existing valves is located at the end of the valve core, making it difficult for the fluid medium to flush the sealing element in this area when the valve is open. These aforementioned flaws in existing valves can severely impact the valve's sealing performance. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a sealing structure for a valve, which can enable a fluid medium to effectively flush impurities deposited at the sealing structure, thereby improving the sealing performance of the valve.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] A sealing structure for a valve, the valve comprising at least a valve body and a valve stem, the sealing structure being installed inside the valve and comprising a valve seat, a valve sleeve and a valve core assembly;

[0006] A valve seat mounting groove is provided in the valve body, the valve seat is provided in the valve seat mounting groove, the valve sleeve is provided on the upper end of the valve seat, the outer circumferential surface of the valve sleeve cooperates with the valve body, and a plurality of throttling holes are evenly provided along the outer circumferential surface of the valve sleeve on the side close to the valve seat, and the valve core assembly is installed in the internal space formed by the valve sleeve and the valve seat; the outer circumferential surface of the valve core assembly is slidably matched with the inner circumferential surface of the valve sleeve to open or close the throttling hole; wherein, a guide portion is provided on the valve core assembly, and a valve seat guide surface used in conjunction with the guide portion is provided on the valve seat, and the guide portion and the valve seat guide surface are used to guide the fluid medium to flush impurities deposited on the valve seat or the throttling hole.

[0007] Preferably, the valve core assembly includes a valve core body, and a sealing pressure ring and a throttle shaft respectively connected to the valve core body; a valve core boss is provided at the lower end of the valve core body, and the guide portion includes a first guide surface provided at the valve core boss, and a second guide surface connected to the first guide surface, and there is a smooth transition between the first guide surface and the second guide surface; wherein, the first guide surface is an arc-shaped surface opening toward the side of the valve seat, and the second guide surface is an inclined surface with an acute angle θ with the horizontal plane, and the angle between the valve seat guide surface and the horizontal plane is the same as the angle between the second guide surface and the horizontal plane.

[0008] Preferably, the guide portion also includes a third guide surface arranged on the outer periphery of the sealing pressure ring, and a fourth guide surface connected to the third guide surface; wherein, the third guide surface and the fourth guide surface are both inclined surfaces with acute angles to the horizontal plane, the angle between the third guide surface and the horizontal plane is α1, the angle between the fourth guide surface and the horizontal plane is α2, and α1>α2.

[0009] Preferably, the throttling hole includes four U-shaped first throttling holes evenly distributed along the outer circumference of the valve sleeve, one open end of which contacts the valve seat, and a plurality of waist-shaped second throttling holes are evenly arranged between two adjacent first throttling holes.

[0010] Preferably, a mounting boss is provided at the upper end of the valve seat, the mounting boss cooperates with the valve seat mounting groove, and the mounting boss has an upper mounting surface of the valve seat and a lower mounting surface of the valve seat, and a valve seat sealing ring is provided between the lower mounting surface of the valve seat and the valve seat mounting groove; the thickness of the mounting boss is less than the depth of the valve seat mounting groove, and the lower end of the valve sleeve cooperates with the upper mounting surface of the valve seat, so that the lower end of the valve sleeve is located in the valve seat mounting groove.

[0011] Preferably, a threaded hole for installing the throttle shaft and a pin hole for installing the sealing pressure ring are respectively provided along the axial direction of the valve core body, and a second groove for installing an adjustment gasket is provided on the inner side of the valve core boss, and the adjustment gasket is used to adjust the axial relative position between the sealing pressure ring and the valve core body; a third groove for installing the sealing pressure ring is also provided between the second groove and the threaded hole, and the sealing pressure ring is inserted into the third groove and abuts against the adjustment gasket and is connected to the valve core body by a pin, and the throttle shaft passes through the sealing pressure ring and is connected to the valve core body by a thread.

[0012] Preferably, a first groove is provided on the inner side of the mounting boss, a pressure ring sealing structure is provided in the first groove, and a pressure ring sealing surface connected to the fourth guide surface is provided on the outer periphery of the sealing pressure ring; a hard alloy layer is provided on the second guide surface and the valve seat guide surface; when the valve is in a closed state, the pressure ring sealing structure and the pressure ring sealing surface cooperate with each other to form a first sealing structure, and the second guide surface and the hard alloy layer on the valve seat guide surface cooperate with each other to form a second sealing structure.

[0013] Preferably, a first chamber for accommodating the sealing pressure ring and a second chamber for accommodating the throttle shaft are provided inside the valve seat, and the first chamber and the second chamber are connected to form a fluid channel for the circulation of the medium; when the valve is in a closed state, there is a gap between the first chamber and the outer peripheral surface of the sealing pressure ring, and there is a gap between the second chamber and the outer peripheral surface of the throttle shaft.

[0014] Preferably, a valve stem connecting portion is formed at the lower end of the valve stem, and a cavity is formed at the upper end of the valve core for inserting the valve stem connecting portion, and a threaded portion is provided in the cavity for cooperating with the valve core nut. After the valve stem connecting portion is inserted into the cavity, the valve stem connecting portion is transmission-connected to the valve core body through the valve core nut and the washer.

[0015] Preferably, a plurality of first pressure balancing holes are provided along the axial direction of the sealing pressure ring, and a plurality of second pressure balancing holes are provided along the axial direction of the valve core body, which pass through the third groove and the cavity. A balancing valve seat is also provided in the cavity of the valve core body, and the balancing valve seat is located between the valve core body and the valve stem. A buffer hole is provided on the balancing valve seat.

[0016] Compared with the prior art, the sealing structure for a valve provided by the present invention has the following beneficial technical effects:

[0017] 1. During the use of the valve, particulate impurities in the fluid medium are easily deposited on the valve seat or throttle hole. Therefore, the present invention provides guide structures on the valve seat and valve core assembly, respectively, and uses the guide structures to guide the fluid medium to effectively flush impurities deposited on the valve seat or throttle hole, thereby improving the sealing performance of the valve. Furthermore, by providing a first guide surface and a second guide surface at the bottom of the valve core body, and providing a third guide surface and a fourth guide surface on the periphery of the sealing pressure ring, when the valve is opened, the provided guide surfaces can effectively guide the flow direction of the fluid medium, reducing the resistance of the fluid medium during the flow process, so that it can better flush impurities deposited on the valve seat or throttle hole. In addition, because the angle α1>α2 between the two guide surfaces provided on the periphery of the sealing pressure ring and the horizontal plane is greater than α1, on the one hand, the fluid medium can be better guided to flow toward the first guide surface, and on the other hand, the sealing pressure ring can be ensured to have a sufficient pressure ring sealing surface, so that it and the pressure ring sealing structure can form an effective sealing pair.

[0018] 2. The present invention installs an adjustment gasket on the valve core body, and the adjustment gasket can adjust the relative axial position between the sealing pressure ring and the valve core body, and then by adjusting the axial position of the third guide surface and the fourth guide surface arranged on the outer periphery of the sealing pressure ring, the fluid medium can flow through the third guide surface, the fourth guide surface, the first guide surface and the second guide surface, so that the fluid medium can better flush impurities deposited on the valve seat or the throttle hole, thereby improving the adaptability of the valve.

[0019] 3. The present invention provides a small gap between the first chamber of the valve seat and the outer circumference of the sealing ring, and between the second chamber and the outer circumference of the throttle shaft. Because a seal is formed between the ring sealing structure and its sealing surface, the medium is not directly vented and pressure is released, effectively providing a pressure relief effect. During the initial valve opening stroke, due to the low medium flow rate, the pressure within the valve chamber decreases, thereby reducing the impact of erosion on the throttle orifice when the valve is opened.

[0020] 4. The present invention provides a pressure ring sealing structure on the valve seat. Compared with the valve in the prior art, when the valve is opened, the medium can be used to effectively flush the pressure ring sealing structure, making it difficult for impurities to deposit here, thereby improving the sealing performance of the sealing structure here.

[0021] 5. This invention incorporates a hard alloy layer on the second guide surface and the valve seat guide surface. When the valve is closed, the pressure ring seal structure and the pressure ring seal surface cooperate to form a primary seal, while the hard alloy layer on the second guide surface and the valve seat guide surface cooperate to form a secondary seal. This optimized dual seal structure improves the valve's sealing performance in the closed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of the sealing structure of the valve when it is in a closed state;

[0023] Figure 2 Schematic diagram of the structure of the valve sleeve;

[0024] Figure 3 It is a structural diagram of the valve core body;

[0025] Figure 4 Schematic diagram of the structure of the valve seat;

[0026] Figure 5 It is a partial enlarged schematic diagram of the sealing pressure ring;

[0027] Figure 6 It is a partial enlarged view of the sealing structure in the open state;

[0028] Figure 7 for Figure 6 A partial enlarged view of point A in the middle.

[0029] The meanings of the symbols in the figure are as follows:

[0030] 1. Valve body; 11. Valve seat installation groove;

[0031] 2. Valve seat; 21. Valve seat upper mounting surface; 22. Valve seat guide surface; 23. First groove; 24. Press ring sealing structure; 25. Valve seat lower mounting surface; 26. Mounting boss; 27. First chamber; 28. Second chamber;

[0032] 3. Valve stem; 31. Valve stem connection; 32. Valve core nut; 33. Washer; 34. Balance valve seat;

[0033] 4. Valve sleeve; 41. First throttle hole; 42. Impurities; 43. Second throttle hole;

[0034] 5. Valve core assembly; 51. Valve core body; 52. Sealing ring; 53. Throttle shaft;

[0035] 511, first guide surface; 512, second guide surface; 513, second groove; 514, adjustment pad; 515, threaded hole; 516, pin hole; 517, valve core boss; 518, third groove; 519, cavity;

[0036] 521, third guide surface; 522, fourth guide surface; 523, pressure ring sealing surface; DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in 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 part of the embodiments of the present invention, not all of them.

[0038] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0041] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is typically placed when in use, or the orientations or positional relationships commonly understood by those skilled in the art. Such terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0042] See attached Figure 1 -Attached Figure 7 As shown, the present invention provides a sealing structure for a valve, which at least includes a valve body 1 and a valve stem 3. The sealing structure is installed inside the valve and includes a valve seat 2, a valve sleeve 4 and a valve core assembly 5.

[0043] A valve seat mounting groove 11 is provided within the valve body 1, within which a valve seat 2 is disposed. A valve sleeve 4 is provided at the upper end of the valve seat 2. The outer circumference of the valve sleeve 4 cooperates with the valve body 1. Several throttling holes are evenly arranged along the outer circumference of the valve sleeve 4 on the side closest to the valve seat 2. A valve core assembly 5 is installed within the interior space formed by the valve sleeve 4 and the valve seat 2. The outer circumference of the valve core assembly 5 slidably cooperates with the inner circumference of the valve sleeve 4 to open or close the throttling holes. A guide portion is provided on the valve core assembly 5, and a valve seat guide surface 22 is provided on the valve seat 2 for use with the guide portion. The guide portion and the valve seat guide surface 22 are used to guide the fluid medium to flush out impurities 42 deposited on the valve seat 2 or the throttling holes.

[0044] Because particulate impurities in the fluid medium are easily deposited on the valve seat or throttle hole during valve use, in the above embodiment, guide structures are provided on the valve seat and valve core assembly, respectively, to guide the fluid medium to effectively flush out impurities deposited on the valve seat or throttle hole, thereby improving the sealing performance of the valve.

[0045] Preferably, the valve core assembly 5 includes a valve core body 51, and a sealing ring 52 and a throttle shaft 53 respectively connected to the valve core body 51. A valve core boss 517 is provided at the lower end of the valve core body 51. The guide portion includes a first guide surface 511 provided on the valve core boss 517, and a second guide surface 512 connected to the first guide surface 511, with a smooth transition between the first guide surface 511 and the second guide surface 512. The first guide surface 511 is an arcuate curved surface with an opening toward the side of the valve seat 2, and the second guide surface 512 is an inclined surface with an acute angle θ with the horizontal plane. The angle between the valve seat guide surface 22 and the horizontal plane is the same as the angle between the second guide surface 512 and the horizontal plane.

[0046] Preferably, the guide portion further includes a third guide surface 521 provided on the outer periphery of the sealing pressure ring 52, and a fourth guide surface 522 connected to the third guide surface 521. The third guide surface 521 and the fourth guide surface 522 are both inclined surfaces with an acute angle to the horizontal plane. The angle between the third guide surface 521 and the horizontal plane is α1, and the angle between the fourth guide surface 522 and the horizontal plane is α2, and α1>α2.

[0047] In the above embodiment, by providing the first guide surface and the second guide surface at the bottom of the valve core body, and providing the third guide surface and the fourth guide surface at the outer periphery of the sealing pressure ring, when the valve is opened, the provided guide surfaces can effectively guide the flow direction of the fluid medium (see the attached Figure 7 The flow path at point B in the figure reduces the resistance of the fluid during flow, allowing it to better flush impurities deposited on the valve seat or orifice. Furthermore, because the angles α1 and α2 between the two guide surfaces provided on the outer periphery of the sealing follower and the horizontal plane are greater, the fluid is better guided toward the first guide surface while ensuring that the sealing follower has a sufficient sealing surface, forming an effective sealing pair with the follower sealing structure.

[0048] Preferably, the throttle holes include four U-shaped first throttle holes 41 evenly distributed along the outer circumference of the valve sleeve 4, with one open end of each throttle hole in contact with the valve seat 2. A plurality of waist-shaped second throttle holes 43 are evenly arranged between two adjacent first throttle holes 41. The elongated throttle holes improve the flow capacity of the medium, reduce the risk of clogging of the throttle holes, and simultaneously reduce the erosion and corrosion of the throttle holes by the medium, thereby improving the throttling and venting performance of the valve.

[0049] Preferably, a mounting boss 26 is provided at the upper end of the valve seat 2. This mounting boss 26 cooperates with the valve seat mounting groove 11. The mounting boss 26 has an upper valve seat mounting surface 21 and a lower valve seat mounting surface 25. A valve seat sealing ring is provided between the lower valve seat mounting surface 25 and the valve seat mounting groove 11 to seal between the valve seat 2 and the valve body 1. The thickness of the mounting boss 26 is less than the depth of the valve seat mounting groove 11. The lower end of the valve sleeve 4 cooperates with the valve seat upper mounting surface 21, so that the lower end of the valve sleeve 4 is located in the valve seat mounting groove 11. Thus, the installation and positioning of the valve sleeve 4 are achieved by utilizing the inner circumferential wall of the valve body 1 and the valve seat mounting groove 11, respectively.

[0050] Preferably, a threaded hole 515 for mounting the throttle shaft 53 and a pin hole 516 for mounting the sealing pressure ring 52 are respectively defined along the axial direction of the valve core body 51. A second groove 513 for mounting an adjustment washer 514 is defined on the inner side of the valve core boss 517. The adjustment washer 514 is used to adjust the axial relative position between the sealing pressure ring 52 and the valve core body 51. A third groove 518 for mounting the sealing pressure ring 52 is also defined between the second groove 513 and the threaded hole 515. The sealing pressure ring 52 is inserted into the third groove 518 and abuts against the adjustment washer 514, then connected to the valve core body 51 via a pin. The throttle shaft 53 passes through the sealing pressure ring 52 and is threadedly connected to the valve core body 51. Of course, other connection methods can also be used to mount the sealing pressure ring 52 and the throttle shaft 53 to the valve core body 51, which will not be described in detail here.

[0051] In the above embodiment, an adjustment gasket is installed on the valve core body, and the adjustment gasket can adjust the relative axial position between the sealing pressure ring and the valve core body, and then by adjusting the axial position of the third guide surface and the fourth guide surface set on the outer periphery of the sealing pressure ring, the fluid medium can flow through the third guide surface, the fourth guide surface, the first guide surface and the second guide surface, so that the fluid medium can better flush impurities deposited on the valve seat or the throttle hole, thereby improving the adaptability of the valve.

[0052] Preferably, a first groove 23 is provided on the inner side of the mounting boss 26, a pressure ring sealing structure 24 is provided in the first groove 23, and a pressure ring sealing surface 523 is provided on the outer periphery of the sealing pressure ring 52, which is connected to the fourth guide surface 522; a hard alloy layer is provided on the second guide surface 512 and the valve seat guide surface 22; when the valve is in the closed state, the pressure ring sealing structure 24 and the pressure ring sealing surface 523 cooperate to form a first sealing structure, and the hard alloy layer on the second guide surface 512 and the valve seat guide surface 22 cooperate to form a second sealing structure. In this embodiment, the pressure ring sealing structure in the first groove 23 can be configured as a sealing ring for sealing, but other methods can also be used, such as filling the first groove 23 with a hard alloy layer. Those skilled in the art can choose according to actual needs.

[0053] Preferably, the valve seat 2 is internally provided with a first chamber 27 for accommodating the sealing ring 52, and a second chamber 28 for accommodating the throttle shaft 53. The first chamber 27 and the second chamber 28 communicate to form a fluid passage for the flow of the medium. When the valve is closed, a gap exists between the first chamber 27 and the outer circumference of the sealing ring 52, and a gap exists between the second chamber 28 and the outer circumference of the throttle shaft 53.

[0054] In the above-mentioned embodiment, the present invention provides a small gap between the first chamber of the valve seat and the outer circumference of the sealing ring, and between the second chamber and the outer circumference of the throttle shaft. Because a seal is formed between the ring sealing structure and the ring sealing surface, the medium is not directly vented and pressure is released, effectively providing a pressure relief effect. During the initial stroke of the valve opening, due to the low medium flow rate, the pressure within the valve chamber decreases, thereby reducing the impact of erosion on the throttle orifice when the valve opens.

[0055] Furthermore, the present invention incorporates a pressure ring sealing structure on the valve seat. Compared to conventional valves, this allows the medium to effectively flush the pressure ring sealing structure when the valve is opened, preventing impurities from accumulating there and improving the sealing performance of the sealing structure. Furthermore, a hard alloy layer is provided on the second guide surface and the valve seat guide surface. When the valve is closed, the pressure ring sealing structure and the pressure ring sealing surface cooperate to form a primary sealing structure, while the hard alloy layer on the second guide surface and the valve seat guide surface cooperates to form a secondary sealing structure. This optimized dual sealing structure improves the sealing performance of the valve in the closed state.

[0056] Preferably, a valve stem connecting portion 31 is formed at the lower end of the valve stem 3, and a cavity 519 for inserting the valve stem connecting portion 31 is formed at the upper end of the valve core body 51. A threaded portion that cooperates with the valve core nut 32 is provided in the cavity 519. After the valve stem connecting portion 31 is inserted into the cavity 519, the valve stem connecting portion 31 is transmission-connected to the valve core body 51 through the valve core nut 32 and the washer 33.

[0057] Preferably, a plurality of first pressure balancing holes are provided along the axial direction of the sealing pressure ring 52, and a plurality of second pressure balancing holes are provided along the axial direction of the valve core body 51, which pass through the third groove 518 and the cavity 519. A balancing valve seat 34 is also provided in the cavity 519. The balancing valve seat 34 is located between the valve core body 51 and the valve stem 3, and a buffer hole is provided on the balancing valve seat 34. When the valve is opened, the pressure medium flows through the fluid channel on the valve seat, passes through the first pressure balancing hole, the second pressure balancing hole and the buffering effect of the balancing valve seat 34, and enters the upper cavity of the valve, ensuring the pressure balance of the upper and lower end faces of the valve core body 51, making it convenient to open and close the valve. The present invention sets a pressure balancing structure in the valve core, ensuring the pressure balance of the upper and lower end faces of the valve core, making it convenient to open and close the valve.

[0058] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A sealing structure for a valve, characterized in that: The valve comprises at least a valve body and a valve stem, and the sealing structure for the valve is installed inside the valve and comprises a valve seat, a valve sleeve and a valve core assembly; A valve seat mounting groove is provided in the valve body, the valve seat is provided in the valve seat mounting groove, the valve sleeve is provided at the upper end of the valve seat, the outer circumferential surface of the valve sleeve cooperates with the valve body, a plurality of throttling holes are evenly provided along the outer circumferential surface of the valve sleeve on a side close to the valve seat, and the valve core assembly is installed in the internal space formed by the valve sleeve and the valve seat; the outer circumferential surface of the valve core assembly is slidably cooperated with the inner circumferential surface of the valve sleeve to open or close the throttling hole; wherein, a guide portion is provided on the valve core assembly, and a valve seat guide surface used in cooperation with the guide portion is provided on the valve seat, and the guide portion and the valve seat guide surface are used to guide the fluid medium to flush impurities deposited on the valve seat or the throttling hole; The valve core assembly includes a valve core body, and a sealing pressure ring and a throttle shaft respectively connected to the valve core body; a valve core boss is provided at the lower end of the valve core body; the guide portion includes a first guide surface provided on the valve core boss, and a second guide surface connected to the first guide surface, with a smooth transition between the first guide surface and the second guide surface; The guide portion further includes a third guide surface provided on the outer periphery of the sealing pressing ring, and a fourth guide surface connected to the third guide surface; The upper end of the valve seat is provided with a mounting boss, the inner side of the mounting boss is provided with a first groove, a pressure ring sealing structure is provided in the first groove, and the outer periphery of the sealing pressure ring is provided with a pressure ring sealing surface connected to the fourth guide surface; the second guide surface and the valve seat guide surface are provided with a hard alloy layer; when the valve is in a closed state, the pressure ring sealing structure and the pressure ring sealing surface cooperate with each other to form a first sealing structure, and the second guide surface and the hard alloy layer on the valve seat guide surface cooperate with each other to form a second sealing structure.

2. The sealing structure for a valve according to claim 1, wherein: The first guide surface is an arcuate surface with an opening toward the valve seat side, the second guide surface is an inclined surface with an acute angle θ with the horizontal plane, and the angle between the valve seat guide surface and the horizontal plane is the same as the angle between the second guide surface and the horizontal plane.

3. The sealing structure for a valve according to claim 2, wherein: The third guide surface and the fourth guide surface are both inclined surfaces with acute angles to the horizontal plane. The angle between the third guide surface and the horizontal plane is α1, the angle between the fourth guide surface and the horizontal plane is α2, and α1>α2.

4. The sealing structure for a valve according to claim 3, wherein: The throttle hole includes four U-shaped first throttle holes evenly distributed along the outer peripheral surface of the valve sleeve, one open end of which contacts the valve seat, and a plurality of waist-shaped second throttle holes are evenly arranged between two adjacent first throttle holes.

5. The sealing structure for a valve according to claim 4, characterized in that: The mounting boss cooperates with the valve seat mounting groove, and the mounting boss has an upper mounting surface of the valve seat and a lower mounting surface of the valve seat, and a valve seat sealing ring is provided between the lower mounting surface of the valve seat and the valve seat mounting groove; the thickness of the mounting boss is less than the depth of the valve seat mounting groove, and the lower end of the valve sleeve cooperates with the upper mounting surface of the valve seat, so that the lower end of the valve sleeve is located in the valve seat mounting groove.

6. The sealing structure for a valve according to claim 5, characterized in that: A threaded hole for installing the throttle shaft and a pin hole for installing the sealing pressure ring are respectively provided along the axial direction of the valve core body, and a second groove for installing an adjustment gasket is provided on the inner side of the valve core boss, and the adjustment gasket is used to adjust the axial relative position between the sealing pressure ring and the valve core body; a third groove for installing the sealing pressure ring is also provided between the second groove and the threaded hole, and the sealing pressure ring is inserted into the third groove and abuts against the adjustment gasket and is connected to the valve core body by a pin, and the throttle shaft passes through the sealing pressure ring and is connected to the valve core body by a thread.

7. The sealing structure for a valve according to claim 6, wherein: A first chamber for accommodating the sealing pressure ring and a second chamber for accommodating the throttle shaft are provided inside the valve seat. The first chamber and the second chamber are connected to form a fluid channel for medium circulation. When the valve is in a closed state, a gap exists between the first chamber and the outer peripheral surface of the sealing pressure ring, and a gap exists between the second chamber and the outer peripheral surface of the throttle shaft.

8. The sealing structure for a valve according to claim 7, wherein: A valve stem connecting portion is formed at the lower end of the valve stem, and a cavity is formed at the upper end of the valve core for inserting the valve stem connecting portion. A threaded portion that cooperates with the valve core nut is provided in the cavity. After the valve stem connecting portion is inserted into the cavity, the valve stem connecting portion is transmission-connected to the valve core body through the valve core nut and a washer.

9. The sealing structure for a valve according to claim 8, wherein: A plurality of first pressure balancing holes are provided along the axial direction of the sealing pressure ring, and a plurality of second pressure balancing holes are provided along the axial direction of the valve core body, which pass through the third groove and the cavity. A balancing valve seat is also provided in the cavity of the valve core body. The balancing valve seat is located between the valve core body and the valve stem, and a buffer hole is provided on the balancing valve seat.

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