Stop valve

Abstract

The utility model relates to the technical field of valves, and discloses a stop valve which comprises a valve body, a valve rod, a supporting ring, a packing set, a pressing sleeve and a pressing plate. The supporting ring abuts against the first limiting step, the bottom of the filler set is supported on the supporting ring, the pressing connection section is connected to the upper portion of the filler set in a pressing mode, the guide section is sleeved with the pressing plate, during installation, the fastener penetrates through the first installation hole, the pressing plate is locked and connected to the connecting boss part, in the locking process, the pressing plate downwards extrudes the pressing sleeve, and the pressing sleeve downwards extrudes the filler set; in the locking process, the guide section guides the pressing plate to stably and horizontally descend, the guide section is supported on the inner side of the pressing plate, the pressing plate is prevented from inclining, the situation that when one or some first fasteners are locked firstly, the pressing plate inclines towards the side where the first fasteners are located, and consequently pressure application is uneven is avoided, and it is guaranteed that the pressing plate stably descends in the horizontal posture; and therefore, the pressing sleeve is ensured to uniformly apply pressure to the packing group so as to uniformly compress the packing group, and the sealing performance can be effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a stop valve. Background Art

[0002] The stop valve is a forced sealing valve, usually used in nuclear power plants or some areas with high radioactivity. The existing stop valve includes a valve body and a valve cover, and the valve body and the valve cover are connected by flange bolts. The connection between the valve body and the valve cover is prone to leakage. In order to avoid leakage at the valve body and the valve cover, there is a valve coverless valve in the prior art, which raises the top of the valve body to form a raised part, and sets a packing group in the inner cavity of the raised part. However, the valve structure cannot evenly and effectively apply pressure to the packing group, resulting in poor sealing. Utility Model Content

[0003] In view of this, the utility model provides a stop valve to solve the problem of poor sealing at the packing group of the stop valve without a valve cover in the prior art.

[0004] In a first aspect, the utility model provides a stop valve, comprising:

[0005] The valve body has a heightened portion on the top; a connecting boss portion is provided on the top of the heightened portion; and a first limiting step is provided on the inner wall of the heightened portion;

[0006] A valve stem, one side of which is disposed in the valve body;

[0007] A support ring, which is sleeved outside the valve stem, and the bottom of the support ring abuts against the first limiting step;

[0008] A packing group is sleeved outside the valve stem and filled in the gap formed by the valve stem and the inner wall of the heightened portion; the bottom of the packing group is supported on the support ring;

[0009] A compression sleeve is sleeved outside the valve stem; the compression sleeve comprises a compression section and a guide section, the outer diameter of the guide section is smaller than the outer diameter of the compression section, a second limiting step is formed at the junction of the compression section and the guide section, and the compression section extends into the valve body and is compressed on the packing group;

[0010] A pressure plate is sleeved outside the guide section, and at least two first mounting holes are provided on the pressure plate. A first fastener is suitable for passing through the first mounting holes to connect the pressure plate to the connecting boss portion; the pressure plate applies pressure toward the packing group toward the crimping section.

[0011] Beneficial effect: In the stop valve of this structure, the support ring abuts against the first limiting step, the bottom of the packing group is supported on the support ring, the crimping section is crimped on the upper part of the packing group, and the pressure plate sleeve is arranged outside the guide section. During installation, the fastener passes through the first mounting hole to lock the pressure plate to the connecting boss part. During the locking process, the pressure plate presses the pressing sleeve downward, and the pressing sleeve presses the packing group downward. During the locking process, the guide section guides the pressure plate to descend smoothly and horizontally. The guide section is supported on the inner side of the pressure plate to prevent the pressure plate from tilting, so as to avoid the pressure plate tilting toward the side where the first fastener is located when one or some of the first fasteners are locked first, thereby causing uneven pressure. The pressure plate is ensured to descend smoothly in a horizontal posture, and the pressing sleeve is ensured to evenly press the packing group to evenly compress the packing group, which can effectively ensure the sealing performance.

[0012] In an optional embodiment, an elastic element is further included, and the elastic element is sleeved outside the guide section, and the upper and lower ends of the elastic element respectively abut against the bottom surface of the pressing plate and the second limiting step.

[0013] Beneficial effect: The compression amount of the elastic element can be controlled by observing the gap between the top surface of the guide section and the top surface of the pressure plate. The elastic element cooperates with the pressure plate, the pressure sleeve and the first fastener to realize the floating pre-tightening of the packing group, which can cope with the influence of the fluctuation of the medium temperature and pressure of the valve operation on the valve seal and avoid valve leakage to the greatest extent.

[0014] In an optional embodiment, the elastic element includes a butterfly spring.

[0015] In an optional embodiment, it also includes a support column, an upper flange and a drive assembly, wherein the upper flange is arranged on the upper part of the pressure plate, and the support column connects the upper flange and the connecting boss portion; the drive assembly is rotatably arranged on the upper flange, and the drive assembly is connected to the valve stem.

[0016] Beneficial effect: the first fastener is separately arranged from the support column, and when the support column is damaged, the first fastener can still effectively pre-tighten the packing group, thereby effectively ensuring the sealing performance of the valve.

[0017] In an optional embodiment, the cross-section of the connecting boss portion is rhombus-shaped, two relative corners of the connecting boss portion are connected to the first fastener, and the other two relative corners of the connecting boss portion are connected to the support column.

[0018] Beneficial effect: Compared with the stop valve with a round or square valve cover, the number of fasteners on the connecting boss part can be effectively reduced, and the cross-section of the connecting boss part is set to be a diamond shape, which can effectively reduce the overall size and weight of the valve.

[0019] In an optional embodiment, an anti-rotation component is further included, wherein the anti-rotation component is fixedly connected to the valve stem, and the end of the anti-rotation component away from the valve stem is slidably connected to the support column.

[0020] In an optional embodiment, the anti-rotation assembly includes two positioning blocks, which are arranged opposite to each other and fixedly mounted outside the valve stem. The ends of the two positioning blocks away from the valve stem form an open structure, and the open structure can be slidably mounted outside the support column.

[0021] In an optional embodiment, a first indicator line and a second indicator line are arranged at intervals in the height direction of the support column.

[0022] Beneficial effects: The first indicator line and the second indicator line are used to indicate the open and closed positions of the valve respectively.

[0023] In an optional embodiment, the outer peripheral wall of the valve stem located in the valve body is provided with a downwardly inclined first chamfer, and the bottom of the support ring is provided with a second chamfer. When the valve is open, the first chamfer is attached to the second chamfer.

[0024] Beneficial effect: When the valve is open, the first chamfer is attached to the second chamfer, which prevents the valve stem from moving upward under the pressure of the medium, thereby realizing the anti-blowout function of the valve.

[0025] In an optional embodiment, the drive assembly includes a connecting nut and a handwheel, the connecting nut is rotatably connected to the upper flange, the connecting nut is fixedly connected to the handwheel, the connecting nut is fixedly connected to the valve stem, the handwheel is arranged on the upper part of the upper flange, and a friction reducing part is arranged on the upper part of the upper flange.

[0026] Beneficial effect: During the process of closing and opening the valve, the handwheel rotates relative to the friction reducing member, which can effectively reduce the friction torque when the handwheel rotates, thereby reducing the operating force of the handwheel when opening and closing the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A cross-sectional view of a stop valve according to an embodiment of the utility model;

[0029] Figure 2 for Figure 1 A partial enlarged view of the middle A part;

[0030] Figure 3 It is a cross-sectional view of the matching positions of a valve stem, a support column and a positioning block in a stop valve according to an embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 1. Valve body; 101. Heightened portion; 1011. Connecting boss portion; 2. Valve stem; 201. First chamfer; 3. Support ring; 301. Second chamfer; 4. Packing group; 5. Press sleeve; 6. Press plate; 7. First fastener; 8. Elastic element; 9. Support column; 10. Upper flange; 1101. Connecting nut; 1102. Handwheel; 1201. Positioning block; 13. Friction reducing member; 14. Bearing; 15. Valve disc. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0034] Combine the following Figures 1 to 3 , describing an embodiment of the utility model.

[0035] According to an embodiment of the utility model, on one hand, a stop valve is provided, including a valve body 1, a valve stem 2, a support ring 3, a packing group 4, a pressing sleeve 5 and a pressing plate 6.

[0036] The top of the valve body 1 has a heightened portion 101; the top of the heightened portion 101 is provided with a connecting boss portion 1011; the inner wall of the heightened portion 101 is provided with a first limiting step; one side of the valve stem 2 is arranged in the valve body 1; the support ring 3 is sleeved outside the valve stem 2, and the bottom of the support ring 3 abuts against the first limiting step; the packing group 4 is sleeved outside the valve stem 2 and filled in the gap surrounded by the valve stem 2 and the inner wall of the heightened portion 101; the bottom of the packing group 4 is supported on the support ring 3; the pressing sleeve 5 It is sleeved outside the valve stem 2; the pressing sleeve 5 includes a crimping section and a guide section, the outer diameter of the guide section is smaller than the outer diameter of the crimping section, and a second limiting step is formed at the junction of the crimping section and the guide section, the crimping section extends into the valve body 1 and is crimped on the packing group 4; the pressing plate 6 is sleeved outside the guide section, and at least two first mounting holes are provided on the pressing plate 6, and the first fastener 7 is suitable for passing through the first mounting hole to connect the pressing plate 6 to the connecting boss portion 1011; the pressing plate 6 applies pressure toward the packing group 4 toward the crimping section.

[0037] In the stop valve of this structure, the support ring 3 abuts against the first limiting step, the bottom of the packing group 4 is supported on the support ring 3, the crimping section is crimped on the upper part of the packing group 4, and the pressure plate 6 is sleeved outside the guide section. During installation, the fastener passes through the first mounting hole to lock the pressure plate 6 to the connecting boss portion 1011. During the locking process, the pressure plate 6 presses the pressing sleeve 5 downward, and the pressing sleeve 5 presses the packing group 4 downward. During the locking process, the guide section guides the pressure plate 6 to descend smoothly and horizontally. The guide section is supported on the inner side of the pressure plate 6 to prevent the pressure plate 6 from tilting, so as to avoid the pressure plate 6 tilting toward the side where the first fastener 7 is located when one or some of the first fasteners 7 are locked first, thereby causing uneven pressure. The pressure plate 6 is ensured to descend smoothly in a horizontal posture, thereby ensuring that the pressing sleeve 5 evenly presses the packing group 4 to evenly compress the packing group 4, which can effectively ensure the sealing performance.

[0038] like Figure 1 As shown, in one embodiment, the stop valve further includes an elastic element 8, which is sleeved outside the guide section, and the upper and lower ends of the elastic element 8 respectively abut the bottom surface of the pressure plate 6 and the second limit step. The pressure plate 6 is sleeved outside the guide section. In the initial state, the top surface of the guide section is retracted inside the top surface of the pressure plate 6. During the process of locking the first fastener 7, the pressure plate 6 presses the elastic element 8 downward, the elastic element 8 is compressed, the pressure plate 6 moves downward, and the top surface of the guide section gradually becomes flush with the top surface of the pressure plate 6. The compression amount of the elastic element 8 can be controlled by observing the gap between the top surface of the guide section and the top surface of the pressure plate 6. The elastic element 8 cooperates with the pressure plate 6, the compression sleeve 5 and the first fastener 7 to realize the floating pre-tightening of the packing group 4, which can cope with the influence of the fluctuation of the medium temperature and pressure of the valve operation on the valve seal, and avoid valve leakage to the greatest extent.

[0039] Optionally, in some embodiments, the elastic element 8 includes a butterfly spring, the protruding surface of the butterfly spring abuts against the second limiting step, and the butterfly spring is gradually flattened during the process of locking the first fastener 7. The butterfly spring can effectively ensure the floating sealing effect.

[0040] Optionally, in some embodiments, the first fastener 7 includes a stud, the stud is connected to the connecting boss portion 1011 and the pressure plate 6, and a nut is locked outside the stud.

[0041] like Figure 1 As shown, the stop valve further includes a support column 9, an upper flange 10 and a drive assembly, the upper flange 10 is arranged on the upper part of the pressure plate 6, the support column 9 is connected to the upper flange 10 and the connecting boss portion 1011; the drive assembly is rotatably arranged on the upper flange 10, and the drive assembly is connected to the valve stem 2. The support column 9 is connected to the upper flange 10 and the connecting boss portion 1011, and the drive assembly is arranged on the upper flange 10. When the valve needs to be opened or closed, the drive assembly is operated to drive the drive assembly and the valve stem 2 to rise or move downward.

[0042] Optionally, the upper and lower ends of the support column 9 are respectively threadedly connected to the upper flange 10 and the connecting boss portion 1011 , and a nut is locked on the upper part of the support column 9 .

[0043] In the related art, the support column 9 of some stop valves directly serves as the locking member of the pressure plate 6. The support column 9 is integrally arranged with the first fastener 7, and the packing group 4 is locked by the support column 9. In this structure, when splashes appear on the side of the valve and damage the support column 9, the support cannot effectively pre-tighten the packing group 4, thereby affecting the sealing performance of the packing group 4. In the stop valve of this structure, the first fastener 7 and the support column 9 are separately arranged. When the support column 9 is damaged, the first fastener 7 can still effectively pre-tighten the packing group 4, thereby effectively ensuring the sealing performance of the valve.

[0044] Optionally, in some embodiments, Figure 3 As shown, the cross section of the connecting boss portion 1011 is rhombus-shaped, two of the relative corners of the connecting boss portion 1011 are connected to the first fasteners 7, and the other two relative corners of the connecting boss portion 1011 are connected to the support column 9. The stop valve of this structure is a stop valve without a valve cover, and a large-sized stud can be used with a nut to increase the pre-tightening force. Two first fasteners 7 can be set to effectively lock the pressure plate 6 on the connecting boss portion 1011, and the support column 9 can be matched with a large-sized nut to increase the pre-tightening force. Two support columns 9 can effectively lock the upper flange 10 on the connecting boss. Compared with the stop valve with a circular or square valve cover, the number of fasteners on the connecting boss portion 1011 can be effectively reduced, and the cross section of the connecting boss portion 1011 is set to a rhombus, which can effectively reduce the external dimensions and weight of the valve. At the same time, the valve as a whole adopts a detachable structure, which is convenient for rapid disassembly and maintenance of the valve.

[0045] like Figure 1 As shown, in one embodiment, the stop valve also includes an anti-rotation assembly, which is fixedly connected to the valve stem 2. The end of the anti-rotation assembly away from the valve stem 2 is slidably connected to the support column 9. The anti-rotation assembly limits the rotation of the valve stem 2 to drive the valve stem 2 to rise and fall when the driving assembly rotates.

[0046] Optionally, in some embodiments, the anti-rotation assembly includes two positioning blocks 1201, the two positioning blocks 1201 are arranged opposite to each other and fixedly sleeved outside the valve stem 2, and the ends of the two positioning blocks 1201 away from the valve stem 2 form an open structure, and the open structure is slidably sleeved outside the support column 9. The anti-rotation assembly includes two positioning blocks 1201, the two positioning blocks 1201 are fixed on the valve stem 2 after docking, and the open structure is sleeved outside the support column 9. The positioning blocks 1201 are easy to install and the open structure is convenient for sleeved outside the support column 9.

[0047] Optionally, in this embodiment, if Figure 3As shown, a circular groove is provided in the middle of the positioning block 1201, and a flat portion is provided on the groove wall of the circular groove. The two positioning blocks 1201 are butted, and the flat portion cooperates with the flat surface on the valve stem 2 to limit the rotation of the valve stem 2. The two positioning blocks 1201 are fixedly connected by bolts, and the two positioning blocks 1201 are butted to form a semicircular groove-shaped opening structure at both ends.

[0048] Optionally, in some embodiments, a first indicator line and a second indicator line are spaced apart in the height direction of the support column 9 , and the first indicator line and the second indicator line are used to indicate the open and closed positions of the valve, respectively.

[0049] like Figure 2 As shown, in some embodiments, the outer peripheral wall of the valve stem 2 located in the valve body 1 is provided with a downwardly inclined first chamfer 201, and the bottom of the support ring 3 is provided with a second chamfer 301. When the valve is open, the first chamfer 201 is attached to the second chamfer 301 to prevent the valve stem 2 from moving upward under the medium pressure, thereby realizing the valve's anti-blowout function.

[0050] The stop valve also includes a valve flap 15, which is provided with a T-slot. The head of the valve stem 2 is provided with a T-head. The valve flap 15 is connected to the valve stem 2 through the T-slot and the T-head. A flat mating portion is provided between the T-slot and the T-head, which can effectively prevent the valve flap 15 from rotating relative to the valve stem 2.

[0051] like Figure 1 As shown, in some embodiments, the drive assembly includes a connecting nut 1101 and a handwheel 1102, the connecting nut 1101 is rotatably connected to the upper flange 10, the connecting nut 1101 is fixedly connected to the handwheel 1102, the connecting nut 1101 is fixedly connected to the valve stem 2, the handwheel 1102 is arranged at the upper part of the upper flange 10, and the upper part of the upper flange 10 is provided with a friction reducing member 13. When closing the valve, the handwheel 1102 is rotated clockwise, the handwheel 1102 descends and fits on the friction reducing member 13, and the handwheel 1102 is continuously rotated to drive the valve stem 2 and the valve disc 15 to continue to descend, so that the valve disc 15 is pressed against the valve seat. When opening the valve, the handwheel 1102 is rotated counterclockwise, and the handwheel 1102 gradually disengages from the friction reducing member 13. In the process of closing and opening the valve, the handwheel 1102 rotates relative to the friction reducing member 13, which can effectively reduce the friction torque when the handwheel 1102 rotates, so as to reduce the operating force of the handwheel 1102 when opening and closing the valve.

[0052] Optionally, the friction reducing member 13 comprises a copper washer.

[0053] like Figure 1 As shown, the stop valve further includes a bearing 14, which is sleeved outside the connecting nut 1101. The bearing 14 cooperates with the friction reducing member 13 to reduce the friction torque when the valve is switched, making the operation of opening or closing the valve more labor-saving. Optionally, the bearing 14 includes a needle bearing 14.

[0054] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A stop valve, characterized in that: include: The valve body (1) has a raised portion (101) at the top; a connecting boss portion (1011) is provided at the top of the raised portion (101); and a first limiting step is provided on the inner wall of the raised portion (101); A valve stem (2), one side of which is arranged in the valve body (1); A support ring (3) is sleeved outside the valve stem (2), and the bottom of the support ring (3) abuts against the first limiting step; A packing group (4) is sleeved outside the valve stem (2) and fills the gap formed by the valve stem (2) and the inner wall of the elevated portion (101); the bottom of the packing group (4) is supported on the support ring (3); A pressing sleeve (5) is sleeved on the outside of the valve stem (2); the pressing sleeve (5) comprises a crimping section and a guide section, the outer diameter of the guide section is smaller than the outer diameter of the crimping section, a second limiting step is formed at the junction of the crimping section and the guide section, and the crimping section extends into the valve body (1) and is crimped onto the packing group (4); A pressure plate (6) is sleeved outside the guide section, and at least two first mounting holes are provided on the pressure plate (6). A first fastener (7) is suitable for passing through the first mounting holes to connect the pressure plate (6) to the connecting boss portion (1011); the pressure plate (6) applies pressure toward the packing group (4) toward the crimping section.

2. The stop valve according to claim 1, characterized in that: It also comprises an elastic element (8), wherein the elastic element (8) is sleeved outside the guide section, and the upper and lower ends of the elastic element (8) respectively abut against the bottom surface of the pressing plate (6) and the second limiting step.

3. The stop valve according to claim 2, characterized in that: The elastic element (8) comprises a butterfly spring.

4. The stop valve according to any one of claims 1 to 3, characterized in that: It also includes a support column (9), an upper flange (10) and a drive assembly, wherein the upper flange (10) is arranged on the upper part of the pressure plate (6), and the support column (9) connects the upper flange (10) and the connecting boss portion (1011); the drive assembly is rotatably arranged on the upper flange (10), and the drive assembly is connected to the valve stem (2).

5. The stop valve according to claim 4, characterized in that: The cross section of the connecting boss portion (1011) is rhombus-shaped, and two relative corners of the connecting boss portion (1011) are connected to the first fastener (7), and the other two relative corners of the connecting boss portion (1011) are connected to the support column (9).

6. The stop valve according to claim 4, characterized in that: It also comprises an anti-rotation component, which is fixedly connected to the valve stem (2), and the end of the anti-rotation component away from the valve stem (2) is slidably connected to the support column (9).

7. The stop valve according to claim 6, characterized in that: The anti-rotation assembly comprises two positioning blocks (1201), the two positioning blocks (1201) are arranged opposite to each other and fixedly sleeved outside the valve stem (2), and the ends of the two positioning blocks (1201) away from the valve stem (2) form an open structure, and the open structure can be slidably sleeved outside the support column (9).

8. The stop valve according to claim 6, characterized in that: A first indication line and a second indication line are arranged at intervals in the height direction of the support column (9).

9. The stop valve according to any one of claims 1 to 3, characterized in that: The outer peripheral wall of the valve stem (2) located in the valve body (1) is provided with a first chamfer (201) inclined downward, and the bottom of the support ring (3) is provided with a second chamfer (301). When the valve is in an open state, the first chamfer (201) is attached to the second chamfer (301).

10. The stop valve according to claim 4, characterized in that: The driving assembly comprises a connecting nut (1101) and a handwheel (1102); the connecting nut (1101) is rotatably connected to the upper flange (10); the connecting nut (1101) is fixedly connected to the handwheel (1102); the connecting nut (1101) is fixedly connected to the valve stem (2); the handwheel (1102) is arranged on the upper part of the upper flange (10); and a friction reducing member (13) is arranged on the upper part of the upper flange (10).

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