Top-mounted ball valve applied to ultralow-temperature environment

Abstract

The invention relates to a top-mounted ball valve applied to an ultra-low temperature environment, and relates to the technical field of valves, the top-mounted ball valve comprises a valve body, a valve ball located in the valve body, a valve rod fixedly arranged on the valve ball and a valve cover fixedly arranged on the upper side of the valve body, the upper end of the valve rod penetrates through the upper side face of the valve cover, and an operation assembly for controlling the valve rod to rotate is arranged on the valve cover; valve seats located on the two sides of the valve ball are arranged in the valve body in a sliding mode, and wear-resisting layers are fixedly arranged on the side faces, facing the valve ball, of the valve seats. A fixing ring located on the side face, away from the valve ball, of the valve seat is fixedly arranged in the valve body, an elastic piece in a compressed state is arranged between the fixing ring and the valve seat, and the elastic piece is used for extruding the valve seat to enable the valve seat to abut against the valve ball. According to the ball valve, in the application process of the ball valve, the elastic piece continuously extrudes the valve seat, so that the wear-resistant layer on the valve seat tightly abuts against the valve ball all the time, the sealing performance between the valve ball and the valve seat is improved, and the possibility that a conveyed medium passes through a gap between the valve ball and the valve seat is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to a top-entry ball valve for use in ultra-low temperature environments. Background Art

[0002] Ultra-low temperature ball valves are specially designed for the flow of media in extremely low temperature working environments and are essential key equipment in industries such as petrochemicals. In the petrochemical field, valves used in temperatures below -40°C are usually defined as cryogenic valves, depending on the temperature of the medium, while valves that can withstand ultra-low temperature environments below -101°C are specifically called ultra-low temperature valves. Such valves must meet extremely stringent standards in terms of structure and material selection to ensure stable operation and excellent sealing performance under extremely low temperature conditions.

[0003] A cryogenic ball valve in the prior art is mainly composed of core components such as a valve body, a valve cover, a valve ball, a valve stem and an actuator. A valve seat is arranged in the valve body, which forms a precise match with the valve ball. The valve ball is driven to rotate in the valve seat through the rotation of the valve stem, thereby realizing the opening and closing of the flow channel. In addition, a packing cavity is specially arranged inside the valve cover and filled with specially designed packing to further enhance the sealing effect of the valve and ensure that the medium will not leak under ultra-low temperature conditions.

[0004] However, although the prior art ultra-low temperature ball valve has made remarkable achievements in design and manufacturing, it still faces some challenges in long-term practical operation. In particular, under the continuous impact and wear of the cryogenic fluid medium, the tight fit between the valve seat and the valve ball may gradually change, or even become loose. Once this looseness is formed, it will become a potential leakage risk point, posing a serious threat to the safe operation of the valve. Especially when the valve is closed, if the gap between the valve seat and the valve ball increases due to wear, the cryogenic fluid medium may leak out from these gaps, which will not only affect the normal circulation of the medium, but also may pollute the environment and even cause safety accidents. There is room for improvement. Summary of the invention

[0005] The purpose of the present application is to provide a top-mounted ball valve for use in ultra-low temperature environments, so as to solve the problem that the above-mentioned ball valve may cause medium leakage due to the wear gap between the valve seat and the ball valve during long-term use.

[0006] The present application provides a top-entry ball valve for use in ultra-low temperature environments that adopts the following technical solutions: A top-mounted ball valve for use in ultra-low temperature environments comprises a valve body, a valve ball located in the valve body, a valve stem fixed on the valve ball, and a valve cover fixed on the upper side of the valve body, the upper end of the valve stem passes through the upper side of the valve cover, and the valve cover is provided with an operating component for controlling the rotation of the valve stem; valve seats are slidably provided in the valve body and are located on both sides of the valve ball, and a wear-resistant layer is fixed on the side of the valve seat facing the valve ball; a fixing ring is fixed in the valve body and is located on the side of the valve seat away from the valve ball, an elastic member in a compressed state is provided between the fixing ring and the valve seat, and the elastic member is used to squeeze the valve seat so that it is tightly against the valve ball.

[0007] By adopting the above technical solution, when the ball valve is used, due to the coordinated arrangement of the fixing ring, the elastic member and the sliding valve seat, the elastic member continuously squeezes the valve seat, so that the wear-resistant layer on the valve seat is always in close contact with the valve ball, thereby improving the sealing performance between the valve ball and the valve seat and reducing the possibility of the conveyed medium passing through the gap between the valve ball and the valve seat.

[0008] Optionally, a convex ring is fixedly provided on the side edge of the fixing ring facing the valve seat, a gasket is fixedly provided on the side of the convex ring away from the fixing ring, and a relief ring groove for inserting the gasket and the convex ring is provided on the side of the valve seat away from the valve ball.

[0009] By adopting the above technical solution, after the fixing ring is installed, the convex ring and the gasket are inserted into the yield ring groove on the valve seat, thereby reducing the possibility of the fixing ring and the valve seat being deflected or misaligned when the ball valve is used.

[0010] Optionally, the elastic member includes a plurality of first mounting seats and a first compression spring, a first recessed groove for the first mounting seat to be inserted into is provided on the bottom side of the yield ring groove, a first mounting groove for the first compression spring to be inserted into is provided on the first mounting seat, and an end of the first compression spring is located outside the first mounting groove and pressed tightly against the gasket.

[0011] By adopting the above technical solution, in the combination setting of the first mounting seat and the first compression spring, the first compression spring is installed inside the first mounting groove, and the first compression spring in a compressed state continuously and indirectly squeezes the valve seat, so that the wear-resistant layer on the valve seat is always in close contact with the valve ball, thereby reducing the possibility of wear gap between the valve seat and the valve ball due to long-term use of the ball valve.

[0012] Optionally, the elastic member includes a second compression spring, a second mounting seat, a top ring and a third compression spring, a first ring groove for inserting the top ring and the second mounting seat is provided on the bottom side of the yield ring groove, a second recessed groove for inserting the third compression spring is provided on the bottom side of the first ring groove; a second mounting seat is provided with a second mounting groove for inserting the second compression spring, the second mounting seat is fixedly connected to the side of the gasket away from the fixing ring, the end of the third compression spring away from the valve seat protrudes out of the second recessed groove and abuts against one side of the top ring, and the end of the second compression spring away from the gasket protrudes out of the second mounting groove and abuts against the other side of the top ring.

[0013] By adopting the above technical solution, when the elastic part is installed, the second compression spring squeezes the top ring, the positioning spring squeezes the third compression spring, and the third compression spring squeezes the valve seat. Due to the coordinated arrangement of the second compression spring and the third compression spring, the supporting force and sealing performance of the valve seat are improved.

[0014] Optionally, a graphite ring is provided on the side of the fixing ring, and a mounting ring groove for inserting the graphite ring is provided on the outer periphery of the convex ring.

[0015] By adopting the above technical solution, since the graphite ring has good high temperature resistance and corrosion resistance, the gap between the outer peripheral surface of the fixed ring and the inner wall of the valve body is reduced, thereby reducing the possibility of leakage of the conveyed medium from the gap between the fixed ring and the valve body.

[0016] Optionally, the valve cover includes a cover body installed on the valve body and an extension sleeve fixed on the cover body, the extension sleeve is sleeved on the outer periphery of the valve stem, an isolation plate is fixedly sleeved on the outer periphery of the extension sleeve, and a first retaining ring located below the isolation plate is fixedly provided on the outer periphery of the valve body.

[0017] By adopting the above technical solution, when the ball valve is used in an ultra-low temperature environment, due to the setting of the isolation plate, the rising cold air freezes and adheres to the lower side of the isolation plate, thereby reducing the possibility of condensed water vapor adhering to the operating component and affecting its performance; during the process of fixing the isolation plate, the bottom side of the isolation plate abuts against the upper side of the first retaining ring, and in this state the first retaining ring supports and limits the isolation plate.

[0018] Optionally, the fixing ring is slidably arranged inside the valve body, an adjusting ring groove is provided on the outer periphery of the fixing ring, and a first inclined surface is provided on the opening edge of the adjusting ring groove; an inspection hole is provided on the valve body, and an end cover for sealing the inspection hole is installed; an adjusting block is provided in the inspection hole, and a second inclined surface is provided on the edge of the adjusting block facing the fixing ring; the adjusting block is inserted into the adjusting ring groove after passing through the inspection hole, and the second inclined surface abuts against the first inclined surface of the inner wall of the adjusting slide groove, so that the fixing ring can slide in a direction close to the valve seat.

[0019] By adopting the above technical solution, when the ball valve needs to be repaired, the end cover can be removed first and the adjusting block can be taken out from the inspection hole to release the tight limit on the fixing ring. At this time, the elastic member squeezes the fixing ring in the opposite direction to release the tight contact of the valve seat on the valve ball. With this arrangement, after the valve cover is removed, it is convenient to remove the valve ball from the inside of the valve body, thereby improving the corresponding maintenance efficiency.

[0020] Optionally, a guide clamp ring is fixedly provided on the inner edge of the side surface of the fixing ring away from the valve seat, and a guide groove for the guide clamp ring to be inserted and slide is opened on the inner wall of the valve body.

[0021] By adopting the above technical solution, after the fixing ring is installed, the guide clamping ring on the fixing ring is slidably inserted into the corresponding guide groove and can slide back and forth along the guide groove, thereby limiting the sliding stroke of the fixing ring and preventing the fixing ring from sliding out directly from the side opening of the valve body.

[0022] Optionally, an annular positioning block is fixedly provided on the bottom side of the adjustment ring groove close to the valve seat, and a positioning notch is opened on the adjustment block for inserting the annular positioning block; the annular positioning block can slide away from the valve seat along with the adjustment ring and abut against the inner wall of the inspection hole.

[0023] By adopting the above technical solution, when the valve ball is taken out for inspection, the end cover is opened and the adjusting block is taken out from the inspection hole. At this time, under the squeezing of the elastic member, the annular positioning block can slide in the direction away from the valve seat along with the adjusting ring, and the annular positioning block abuts against the inner wall of the inspection hole, so that the annular positioning block plays a role in further limiting the sliding stroke of the fixed ring; when the ball valve is used normally, the annular positioning block is inserted into the positioning notch on the adjusting block, so as to improve the installation stability of the adjusting block.

[0024] Optionally, a rubber pad, a fourth compression spring and an arc-shaped protrusion are provided on the side of the adjustment block, and a placement groove for the rubber pad, the fourth compression spring and the arc-shaped protrusion to be placed is opened on the outer surface of the adjustment block; a closing opening connected to the bottom side of the placement groove is opened on the inner wall of the positioning notch; the two ends of the fourth compression spring are respectively abutted against the rubber pad and the arc-shaped protrusion, and a part of the arc-shaped protrusion protrudes from the closing opening; a protruding block is fixedly provided on the side of the rubber pad away from the fourth compression spring, and one side of the protruding block protrudes from the opening of the placement groove; the annular positioning block squeezes the arc-shaped protrusion and makes the protruding block press against the inner wall of the inspection hole.

[0025] By adopting the above technical solution, when the annular positioning block is inserted into the positioning notch on the adjusting block, due to the coordinated arrangement of the rubber pad, the fourth compression spring and the arc-shaped protrusion, the annular positioning block squeezes the protruding portion of the arc-shaped protrusion and makes the protruding portion of the rubber pad press against the inner wall of the inspection hole, thereby reducing the gap between the adjusting block and the inner wall of the inspection hole and improving the corresponding sealing performance.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Due to the coordinated arrangement of the fixing ring, the elastic member and the sliding valve seat, when the ball valve is used, the elastic member continuously squeezes the valve seat, so that the wear-resistant layer on the valve seat is always in close contact with the valve ball, thereby improving the sealing performance between the valve ball and the valve seat and reducing the possibility of the conveyed medium passing through the gap between the valve ball and the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 It is a cross-sectional structural schematic diagram of the installation and matching of the valve ball and the valve seat in Example 1 of the present application; Figure 3 This is the embodiment of the present application 1 Figure 2 Schematic diagram of the cross-sectional structure from the middle AA perspective; Figure 4 It is a partial cross-sectional structural schematic diagram of the installation and matching of the elastic member in Example 1 of the present application; Figure 5 yes Figure 4 A magnified schematic diagram of part A; Figure 6 yes Figure 4 A magnified schematic diagram of part B; Figure 7 It is a partial cross-sectional structural schematic diagram of the installation cooperation between the adjustment block and the fixing ring embodied in the second embodiment of the present application; Figure 8 yes Figure 7 A magnified schematic diagram of part C; Fig. 9 This is a schematic diagram of a partial cross-sectional structure of the fixing ring after the adjustment block is taken out of the inspection hole in Example 2 of the present application; Fig.10 It is a schematic diagram of the partial cross-sectional structure of Example 2 of the present application, showing the state where the adjustment block is taken out from the inspection hole.

[0029] In the figure, 1, valve body; 11, guide groove; 12, inspection hole; 13, end cover; 2, valve ball; 21, valve stem; 22, operating assembly; 3, valve cover; 31, cover body; 32, extension sleeve; 321, isolation plate; 322, first clamping ring; 4, valve seat; 41, wear-resistant layer; 42, yielding ring groove; 43, first groove; 44, first ring groove; 441, second groove; 5, fixing ring; 51, guide clamping ring; 52, adjusting ring groove; 521, first inclined surface; 53, convex ring; 531, mounting ring groove; 5 4. Graphite ring; 55. Washer; 56. Annular positioning block; 6. Elastic member; 61. First mounting seat; 611. First mounting groove; 62. First compression spring; 63. Second mounting seat; 631. Second mounting groove; 64. Top ring; 65. Second compression spring; 66. Third compression spring; 7. Adjustment block; 71. Second inclined surface; 72. Positioning notch; 721. Closure; 73. Sealing pad; 74. Placement groove; 8. Elastic sealing member; 81. Rubber pad; 811. Protruding block; 82. Fourth compression spring; 83. Arc-shaped protrusion. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0031] Embodiment 1: Reference Figure 1 and Figure 2 , a top-entry ball valve for use in ultra-low temperature environments, comprising a valve body 1, a valve ball 2 located in the valve body 1, a valve stem 21 fixed on the valve ball 2, and a valve cover 3 fixed on the upper side of the valve body 1, wherein the upper end of the valve stem 21 passes through the upper side of the valve cover 3, and the valve cover 3 is provided with an operating component 22 for controlling the rotation of the valve stem 21; The user can control the operating component 22, thereby driving the valve stem 21 and the valve ball 2 to rotate synchronously, thereby controlling the on-off of the flow channel in the valve body 1; wherein the operating component 22 is a conventional execution structure and will not be described in detail here.

[0032] Reference Figure 2 The valve cover 3 includes a cover body 31 mounted on the valve body 1 and an extension sleeve 32 integrally formed on the upper side of the cover body 31, wherein the extension sleeve 32 is sleeved on the outer periphery of the valve stem 21, a packing cavity is opened on the inner wall of the extension sleeve 32, and the packing cavity is filled with corresponding packing to prevent the transported medium from leaking from the gap between the extension sleeve 32 and the valve cover 3; An isolation plate 321 is welded and fixed on the outer periphery of the extension sleeve 32, and a first retaining ring 322 is integrally formed on the outer periphery of the valve body 1 and is located below the isolation plate 321; during the welding process of the isolation plate 321, the first retaining ring 322 is used to support and limit the isolation plate 321; when the ball valve is used in an ultra-low temperature environment, the rising cold air is cooled and attached to the lower side of the isolation plate 321, thereby reducing the possibility of condensed water adhering to the operating component 22.

[0033] Reference Figure 2 and Figure 3 Two valve seats 4 are slidably disposed in the valve body 1 and are located on both sides of the valve ball 2, wherein the side of the valve seat 4 facing the valve ball 2 is an arc surface, and a wear-resistant layer 41 is fixedly disposed on the arc surface; a fixing ring 5 is fixedly disposed in the valve body 1 and is located on the side of the valve seat 4 away from the valve ball 2, and an elastic member 6 in a compressed state is disposed between the fixing ring 5 and the valve seat 4; When the ball valve is in use, the elastic member 6 continuously squeezes the valve seat 4 so that the wear-resistant layer 41 on the valve seat 4 is always in close contact with the valve ball 2, thereby improving the sealing performance between the valve ball 2 and the valve seat 4 and reducing the possibility of the conveyed medium passing through the gap between the valve ball 2 and the valve seat 4.

[0034] Reference Figure 3 The fixing ring 5 is slidably arranged inside the valve body 1, and a guide clamping ring 51 is integrally formed on the inner edge of the side of the fixing ring 5 away from the valve seat 4. At the same time, a guide groove 11 for the guide clamping ring 51 to be inserted and slide is provided on the inner wall of the valve body 1, so that the fixing ring 5 can reciprocate along its own axial direction, and the sliding stroke of the fixing ring 5 is limited by the guide groove 11; An adjusting ring groove 52 is provided on the outer periphery of the fixing ring 5, and a first inclined surface 521 is provided on the opening edge of the adjusting ring groove 52; an inspection hole 12 is provided on the valve body 1, and an end cover 13 for blocking the inspection hole 12 is fixedly provided, and the end cover 13 is fixed to the outer side of the valve body 1 by a plurality of screws, which is a conventional fixing method and will not be described in detail here; An adjusting block 7 is arranged in the inspection hole 12, and a second inclined surface 71 is arranged on the edge of the adjusting block 7; after the adjusting block 7 passes through the inspection hole 12, a part of it is inserted into the adjusting ring groove 52, and the second inclined surface 71 on the adjusting block 7 abuts against the first inclined surface 521 of the inner wall of the adjusting slide groove. When the adjusting block 7 is inserted toward the inside of the valve body 1, the fixing ring 5 will slide toward the direction close to the valve seat 4, so that the fixing ring 5 is pressed tightly against the elastic member 6.

[0035] Reference Figure 4 and Figure 5 A convex ring 53 is integrally formed on the side edge of the fixing ring 5 facing the valve seat 4, and a graphite ring 54 is provided on the side of the fixing ring 5. A mounting ring groove 531 is provided on the outer periphery of the convex ring 53 for inserting and fixing the graphite ring 54; a rubber gasket 55 is fixed on the side of the convex ring 53 away from the fixing ring 5, and a yielding ring groove 42 is provided on the side of the valve seat 4 away from the valve ball 2 for inserting the gasket 55 and the convex ring 53; When the fixing ring 5 is installed, the convex ring 53 and the graphite ring 54 are fixedly abutted against the gasket 55 , and the three are inserted into the inner part of the yielding ring groove 42 to press and tighten the elastic member 6 .

[0036] Reference Figure 4and Figure 5 The elastic member 6 includes a first mounting seat 61 and a plurality of first compression springs 62, wherein a first recessed groove 43 for the first mounting seat 61 to be placed is formed on the bottom side of a yielding ring groove 42 on one of the valve seats 4, and first mounting grooves 611 for the first compression springs 62 to be placed are evenly formed on the first mounting seat 61, and the end of the first compression spring 62 is located outside the first mounting groove 611 and pressed tightly against the gasket 55.

[0037] Reference Figure 4 and Figure 6 The elastic member 6 further comprises a second mounting seat 63, a top ring 64, a plurality of second compression springs 65 and a plurality of third compression springs 66. A first ring groove 44 for inserting the top ring 64 and the second mounting seat 63 is provided at the bottom side of the yielding ring groove 42 on the other valve seat 4. Second recessed grooves 441 for inserting the third compression springs 66 are evenly provided at the bottom side of the first ring groove 44. The second mounting seat 63 is provided with a second mounting groove 631 for inserting the second compression spring 65, and the second mounting seat 63 is fixedly connected to the side of the gasket 55 away from the fixing ring 5; when the elastic member 6 is installed, the end of the third compression spring 66 away from the valve seat 4 protrudes out of the second recessed groove 441 and abuts against one side of the top ring 64, and the end of the second compression spring 65 away from the gasket 55 protrudes out of the second mounting groove 631 and abuts against the other side of the top ring 64.

[0038] The implementation principle of the embodiment of the present application is: When the ball valve is in use, the elastic member 6 continuously squeezes the valve seat 4 so that the wear-resistant layer 41 on the valve seat 4 is always in close contact with the valve ball 2; when the ball valve needs to be repaired, the end cover 13 can be removed first and the adjusting block 7 can be removed from the inspection hole 12 to release the tight limit on the fixing ring 5. At this time, the elastic member 6 squeezes the fixing ring 5 in the reverse direction to release the close contact of the valve seat 4 with the valve ball 2; after the valve cover 3 is removed, it is convenient to remove the valve ball 2 from the inside of the valve body 1.

[0039] Embodiment 2: Reference Figure 7 and Figure 8 The embodiment of the present application is different from the embodiment 1 in that the fixing ring 5 is fixedly provided with an annular positioning block 56 on the bottom side of the adjusting ring groove 52 close to the valve seat 4, and the adjusting block 7 is provided with a positioning notch 72 for inserting the annular positioning block 56, and a sealing gasket 73 made of rubber material is fixedly provided on the bottom side of the positioning notch 72; a chamfered surface is provided on the outer peripheral edge of the annular positioning block 56, and a chamfered surface is also provided on the opening edge of the positioning notch 72, so as to facilitate the insertion of the annular positioning block 56 into the positioning notch 72; When the ball valve is used normally, the annular positioning block 56 is inserted into the positioning notch 72 on the adjusting block 7, and the annular positioning block 56 is pressed against one side of the sealing gasket 73, so as to improve the installation stability of the adjusting block 7 and the corresponding sealing performance; when the valve ball 2 is taken out for inspection, the end cover 13 is opened and the adjusting block 7 is taken out from the inspection hole 12. At this time, under the extrusion of the elastic member 6, the annular positioning block 56 can slide along the adjusting ring in the direction away from the valve seat 4, and the annular positioning block 56 is pressed against the inner wall of the inspection hole 12, so that the annular positioning block 56 plays a role in limiting the sliding stroke of the fixing ring 5.

[0040] Reference Figure 8 , Fig. 9 and Fig.10 An elastic seal 8 is provided on the side of the adjusting block 7, and a placement groove 74 for the elastic seal 8 to be placed is provided on the outer surface of the adjusting block 7; a closing opening 721 communicating with the bottom side of the placement groove 74 is provided on the inner wall of the positioning notch 72, wherein the elastic seal 8 includes a rubber pad 81, a fourth compression spring 82 and an arc-shaped protrusion 83, and the two ends of the fourth compression spring 82 are fixedly connected to the rubber pad 81 and the arc-shaped protrusion 83 respectively; A portion of the arc-shaped protrusion 83 protrudes from the closing opening 721, and the protruding portion of the arc-shaped protrusion 83 is an arc surface, and the arc length corresponding to the arc surface is a minor arc; a protruding block 811 is integrally formed on the side of the rubber pad 81 away from the fourth compression spring 82, and a portion of the protruding block 811 protrudes from the opening of the placement groove 74 and can abut against the inner wall of the inspection hole 12; When the annular positioning block 56 is inserted into the positioning notch 72 on the adjusting block 7, the annular positioning block 56 squeezes the protruding portion of the arc-shaped protrusion 83 and makes the protruding portion of the rubber pad 81 press against the inner wall of the inspection hole 12, thereby reducing the gap between the adjusting block 7 and the inner wall of the inspection hole 12 and improving the corresponding sealing performance.

[0041] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A top-entry ball valve for use in ultra-low temperature environments, comprising a valve body (1), a valve ball (2) located in the valve body (1), a valve stem (21) fixedly mounted on the valve ball (2), and a valve cover (3) fixedly mounted on the upper side of the valve body (1), wherein the upper end of the valve stem (21) passes through the upper side of the valve cover (3), and the valve cover (3) is provided with an operating component (22) for controlling the rotation of the valve stem (21); It is characterized in that The valve body (1) is provided with a valve seat (4) slidingly disposed on both sides of the valve ball (2); the side of the valve seat (4) facing the valve ball (2) is provided with a wear-resistant layer (41); the valve body (1) is provided with a fixing ring (5) disposed on the side of the valve seat (4) away from the valve ball (2); a compressed elastic member (6) is provided between the fixing ring (5) and the valve seat (4); the elastic member (6) is used to squeeze the valve seat (4) so ​​that it is tightly pressed against the valve ball (2).

2. A top-entry ball valve for use in ultra-low temperature environments according to claim 1, characterized in that: A convex ring (53) is fixedly provided on the side edge of the fixing ring (5) facing the valve seat (4), a gasket (55) is fixedly provided on the side of the convex ring (53) away from the fixing ring (5), and a clearance ring groove (42) for inserting the gasket (55) and the convex ring (53) is provided on the side of the valve seat (4) away from the valve ball (2).

3. A top-entry ball valve for use in ultra-low temperature environments according to claim 2, characterized in that: The elastic member (6) comprises a plurality of first mounting seats (61) and a first compression spring (62); a first recessed groove (43) for the first mounting seat (61) to be placed is provided on the bottom side of the yield ring groove (42); a first mounting groove (611) for the first compression spring (62) to be placed is provided on the first mounting seat (61); an end of the first compression spring (62) is located outside the first mounting groove (611) and is tightly pressed against the washer (55).

4. The top-entry ball valve for use in ultra-low temperature environments according to claim 2, characterized in that: The elastic member (6) comprises a second compression spring (65), a second mounting seat (63), a top ring (64) and a third compression spring (66); a first ring groove (44) is provided on the bottom side of the yielding ring groove (42) for the top ring (64) and the second mounting seat (63) to be placed therein; a second recessed groove (441) is provided on the bottom side of the first ring groove (44) for the third compression spring (66) to be placed therein; The second mounting seat (63) is provided with a second mounting groove (631) for inserting the second compression spring (65); the second mounting seat (63) is fixedly connected to the side of the gasket (55) away from the fixing ring (5); the end of the third compression spring (66) away from the valve seat (4) protrudes out of the second recessed groove (441) and abuts against one side of the top ring (64); the end of the second compression spring (65) away from the gasket (55) protrudes out of the second mounting groove (631) and abuts against the other side of the top ring (64).

5. The top-entry ball valve for use in ultra-low temperature environments according to claim 2, characterized in that: A graphite ring (54) is provided on the side of the fixing ring (5), and a mounting ring groove (531) for inserting the graphite ring (54) is provided on the outer periphery of the convex ring (53).

6. The top-entry ball valve for use in ultra-low temperature environments according to claim 1, characterized in that: The valve cover (3) comprises a cover body (31) mounted on the valve body (1) and an extension sleeve (32) fixed on the cover body (31); the extension sleeve (32) is sleeved on the outer periphery of the valve stem (21); an isolation plate (321) is fixedly sleeved on the outer periphery of the extension sleeve (32); and a first retaining ring (322) located below the isolation plate (321) is fixedly provided on the outer periphery of the valve body (1).

7. The top-entry ball valve for use in ultra-low temperature environments according to claim 1, characterized in that: The fixing ring (5) is slidably arranged inside the valve body (1); an adjusting ring groove (52) is provided on the outer circumference of the fixing ring (5); a first inclined surface (521) is provided on the opening edge of the adjusting ring groove (52); an inspection hole (12) is provided on the valve body (1), and an end cover (13) is installed for sealing the inspection hole (12); An adjusting block (7) is provided in the inspection hole (12), and a second inclined surface (71) is provided on the edge of the adjusting block (7) facing the fixing ring (5); the adjusting block (7) passes through the inspection hole (12) and is inserted into the adjusting ring groove (52), and the second inclined surface (71) abuts against the first inclined surface (521) of the inner wall of the adjusting slide groove, so that the fixing ring (5) can slide in a direction close to the valve seat (4).

8. The top-entry ball valve for use in ultra-low temperature environments according to claim 7, characterized in that: A guide clamping ring (51) is fixedly provided on the inner edge of the side surface of the fixing ring (5) away from the valve seat (4), and a guide recessed groove (11) for the guide clamping ring (51) to be inserted and slide is provided on the inner wall of the valve body (1).

9. The top-entry ball valve for use in ultra-low temperature environments according to claim 8, characterized in that: An annular positioning block (56) is fixedly provided on the bottom side of the adjusting ring groove (52) close to the valve seat (4), and a positioning notch (72) is provided on the adjusting block (7) for the annular positioning block (56) to be inserted; the annular positioning block (56) can slide in a direction away from the valve seat (4) along with the adjusting ring and abut against the inner wall of the inspection hole (12).

10. A top-entry ball valve for use in ultra-low temperature environments according to claim 9, characterized in that: The side of the adjusting block (7) is provided with a rubber pad (81), a fourth compression spring (82) and an arc-shaped protrusion (83); the outer surface of the adjusting block (7) is provided with a placement groove (74) for the rubber pad (81), the fourth compression spring (82) and the arc-shaped protrusion (83) to be placed; the inner wall of the positioning notch (72) is provided with a closing opening (721) which is connected to the bottom side of the placement groove (74); The two ends of the fourth compression spring (82) are respectively in contact with the rubber pad (81) and the arc-shaped protrusion (83), and a portion of the arc-shaped protrusion (83) protrudes from the closing opening (721); a protruding block (811) is fixedly provided on the side of the rubber pad (81) away from the fourth compression spring (82), and one side of the protruding block (811) protrudes from the opening of the placement groove (74); the annular positioning block (56) presses the arc-shaped protrusion (83) and makes the protruding block (811) tightly contact the inner wall of the inspection hole (12).

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