Low-temperature angle valve

Abstract

The utility model provides a low-temperature angle valve which comprises a valve body, a valve cover assembly, a valve rod and a sealing assembly. A valve cavity, an inflow port and an outflow port are formed in the valve body, and the inflow port and the outflow port are in fluid communication with the valve cavity. The bonnet assembly is attached to the valve body from an axial upper side of the valve body. And the valve rod is inserted into the valve cover assembly and can extend into the valve cavity. The sealing assembly is clamped between the valve deck assembly and the valve body in the axial direction in an axial pre-pressing mode. The low-temperature angle valve further comprises a first lining and a second lining which are arranged outside the valve rod in a sleeving mode in a clearance fit mode, and the second lining is clamped between the first lining and the lower valve deck of the valve deck assembly in an elastic deformation mode in the axial direction. By means of the low-temperature angle valve with the structure, long-term stable sealing is achieved at the gap between the valve body and the valve deck assembly, and heat convection between the valve deck and the valve body is effectively avoided.

Description

Technical Field

[0001] This utility model relates to a fluid valve, and more particularly to a cryogenic angle valve. Background Technology

[0002] This section provides background information related to the present invention, which does not necessarily constitute prior art.

[0003] A cryogenic angle valve is a type of valve device commonly used in low-temperature environments, such as air-separation cold boxes. A cryogenic angle valve mainly consists of components such as a valve body, valve seat, valve core, valve cover assembly, and valve stem. The valve cover assembly is typically attached to the valve body axially from above using fasteners such as bolts.

[0004] In existing technology, to prevent fluid entering the valve cavity from leaking out through the gap between the valve body and the valve cover assembly, an O-ring solid metal ring is arranged between the valve body and the valve cover assembly. However, this O-ring solid metal ring will undergo plastic deformation under excessive external load, which seriously affects the sealing effect. In addition, the valve stem in existing technology is usually designed to be relatively long, making the valve stem difficult to manufacture and ensuring its coaxiality. Furthermore, the sealing of the radial gap between the valve stem and the valve cover assembly in existing technology also has room for further improvement. The above problems urgently need to be solved. Utility Model Content

[0005] This invention aims to solve two technical problems: firstly, achieving a long-term, stable seal at the gap between the valve body and the valve cover assembly; secondly, reducing the machining difficulty and maintenance cost of the valve stem while ensuring its coaxiality; thirdly, further improving the sealing performance of the radial gap between the valve stem and the valve cover assembly; and fourthly, extending the service life of the threaded holes in the aluminum valve body and ensuring the connection stability between the valve body and the valve cover assembly.

[0006] This invention provides a cryogenic angle valve, comprising a valve body, a valve cover assembly, a valve stem, and a sealing assembly. The valve body has a valve cavity and an inlet and an outlet in fluid communication with the valve cavity. The valve cover assembly is attached to the valve body axially above it. The valve stem is inserted into the valve cover assembly and can extend into the valve cavity. The sealing assembly is axially pre-compressed and clamped between the valve cover assembly and the valve body.

[0007] Preferably, the sealing assembly includes an annular body and an elastic element. A receiving recess is formed on the outer periphery of the annular body, recessed toward the center of the annular body and extending continuously along the entire circumference of the annular body. The elastic element is conformally received in the receiving recess to abut against the upper and lower sides of the annular receiving recess in the axial direction, respectively.

[0008] By setting a sealing assembly with the above configuration, the sealing assembly can continuously apply axial upward and axial downward forces to the valve cover assembly and the valve body, respectively, thereby ensuring that the annular body of the sealing assembly is always tightly pressed against the valve cover assembly and the valve body, effectively reducing the impact on sealing performance caused by plastic deformation of the annular body, and achieving a long-term stable seal between the valve cover assembly and the valve body.

[0009] Preferably, the cross-section of the annular body taken along any diameter orientation is basically C-shaped.

[0010] Preferably, the elastic element is a helical spring that extends continuously along the entire circumference of the annular body.

[0011] Preferably, a receiving groove is provided at the section on the upper shaft end face of the valve body that abuts against the valve cover assembly, and the sealing assembly is installed in the receiving groove.

[0012] Preferably, the valve cover assembly includes a lower valve cover, which is directly connected to the upper shaft end face of the valve body. An axially penetrating valve stem channel is provided in the lower valve cover, through which the valve stem extends into the valve cavity.

[0013] Preferably, the cryogenic angle valve further includes a first bushing and a second bushing, both of which are fitted onto the outside of the valve stem with a clearance fit. The first bushing is installed to the lower section of the inner peripheral wall of the valve stem channel, and the second bushing is clamped between the first bushing and the lower valve cover in a manner that allows for elastic deformation in the axial direction.

[0014] Preferably, the hardness of the second bushing is less than that of the first bushing.

[0015] Preferably, there is a first radial gap between the first bushing and the valve stem, and a second radial gap between the second bushing and the valve stem, wherein the second radial gap is smaller than the first radial gap.

[0016] The first and second bushings with the above configuration can more effectively prevent liquid from overflowing through the radial gap between the valve stem and the lower valve cover.

[0017] Preferably, the valve stem is configured to include an upper stem and a lower stem, the lower axial end of the lower stem extending into the valve cavity through the valve stem channel, and the lower axial end of the upper stem coaxially connected to the upper axial end of the lower stem.

[0018] This two-piece design of the valve stem also ensures good valve stem stability. Furthermore, since two short stems are easier to machine than a single long stem, the valve stem disclosed in this paper can more easily meet coaxiality requirements and facilitates later maintenance. In addition, later maintenance typically only requires repairing / replacing the stem components, further reducing maintenance costs.

[0019] Preferably, the upper axial end of the lower rod includes a first stepped hole and a second stepped hole that are formed from the upper shaft end face of the lower rod and have successively decreasing diameters from top to bottom along the axial direction; the lower axial end of the upper rod includes a first rod segment, a second rod segment, and a third rod segment that have successively increasing diameters from bottom to top along the axial direction; wherein, after the upper rod is connected to the lower rod, the first rod segment is threadedly connected to the second stepped hole, and the second rod segment is inserted into the first stepped hole with a clearance fit.

[0020] Preferably, the valve stem further includes an insert disposed at the bottom of the second stepped hole, wherein after the first rod segment is screwed into the second stepped hole, the first rod segment presses against the insert to cause the insert to undergo elastic deformation.

[0021] Adding an insert can increase the friction at the threaded connection between the first rod segment and the second stepped hole, thereby achieving a good anti-loosening effect.

[0022] Preferably, the lower rod has a constant diameter along the axial direction, and the diameter of the third rod segment is smaller than the diameter of the lower rod. This design can save processing costs and reduce processing difficulty while ensuring the strength of the valve stem.

[0023] Preferably, the lower valve cover is attached to the valve body by means of at least four fasteners, and at least four threaded holes are provided on the upper shaft end face of the valve body for the fasteners to be screwed into them one by one, wherein a threaded sleeve is provided in each of the threaded holes of the valve body.

[0024] By adding a threaded sleeve inside the threaded hole, the stress is evenly distributed on the threaded hole in the valve body, thereby extending the service life of the threaded joint between the lower valve cover and the valve body and ensuring the connection stability between the lower valve cover and the valve body.

[0025] Preferably, the valve cover assembly further includes an upper valve cover and an extended neck, wherein the upper valve cover, the extended neck, and the lower valve cover are connected together sequentially from top to bottom in the axial direction.

[0026] Preferably, the low-temperature angle valve further includes an insulation cylinder, a floating sleeve, and a clamp, wherein the floating sleeve is attached to the upper shaft end of the insulation cylinder by means of the clamp. Attached Figure Description

[0027] The foregoing and other features and characteristics of this application will become clearer from the following detailed description with reference to the accompanying drawings, which are merely illustrative and not necessarily drawn to scale. The same reference numerals are used in the drawings to indicate the same parts, in which:

[0028] Figure 1 A cross-sectional view of a cryogenic angle valve according to the present invention is shown, wherein the radial bushing mechanism is shown as a first example.

[0029] Figure 2 A perspective view of the sealing assembly is shown.

[0030] Figure 3 A cross-sectional view taken along one diameter of the sealing assembly is shown.

[0031] Figure 4 A schematic diagram of the connection area between the lower valve cover and the valve body is shown, with the radial bushing mechanism illustrated as a second example.

[0032] Figure 5 A three-dimensional view of the threaded insert is shown.

[0033] Figure 6 A schematic diagram is shown after the threaded sleeve is fitted into the threaded hole of the valve body.

[0034] Figure 7 A cross-sectional schematic diagram of the lower member is shown.

[0035] Figure 8 A cross-sectional schematic diagram of the connection area between the upper and lower members is shown.

[0036] Reference number list

[0037] 1. Valve body; 11. Valve cavity; 12. Receiving groove; 13. Threaded hole; 14. Inlet; 15. Outlet;

[0038] 2. Valve cover assembly; 21. Lower valve cover; 211. Valve stem passage; 22. Extended neck; 23. Upper valve cover; 24.

[0039] 3. Bolt; 3. Valve stem; 31. Upper rod; 311. First rod segment; 312. Second rod segment; 313. Third rod segment; 32. Lower rod; 321. First stepped hole; 322. Second stepped hole; 33. Insert; 4. Sealing assembly; 41. Annular body; 411. Receiving recess; 42. Helical spring; 51. First bushing; 52.

[0040] Second bushing; 61. Valve seat; 62. Valve core; 7. Threaded sleeve; 8. Insulation cylinder; 9. Floating sleeve; 10.

[0041] Clamps. Detailed Implementation

[0042] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The following description is exemplary in nature and is not intended to limit the present invention or its application or use.

[0043] Certain directional terms used in the description of the accompanying drawings below are to be understood to have normal meaning and refer to those directions involved in the normal observation of the drawings, but not necessarily the orientation of the cryogenic angle valve disclosed herein in actual use. Specifically, "axial" and "radial" refer to... Figure 1 The directions indicated by "L" and "R" are "up" and "down". Figure 1 "Above" and "below" when observing from different angles.

[0044] Figure 1 A cross-sectional view of a cryogenic angle valve according to the present invention is shown. The cryogenic angle valve mainly includes a valve body 1, a valve cover assembly 2, a valve stem 3, a valve seat 61, and a valve core 62. A valve cavity 11 is formed within the valve body 1, and an inlet 14 and an outlet 15 are respectively fluidly connected to the valve cavity 11. Fluid enters the valve cavity 11 through the inlet 14 and exits the valve body 1 through the outlet 15. Normally, the inlet 14 and the outlet 15 are arranged at a 90° angle, but those skilled in the art will understand that the arrangement of the inlet 14 and the outlet 15 is not limited to this.

[0045] The opening and closing of the cryogenic angle valve is determined by the cooperation between the valve stem 3, the valve seat 61, and the valve core 62. Specifically, the valve seat 61 is attached to the inner surface of the valve body 1, and the valve core 62 is located axially above the valve seat 61 and fixedly connected to the lower shaft end of the valve stem 3 so as to move axially up and down under the drive of the valve stem 3. When the valve stem 3 moves upward, the valve core 62 disengages from the valve seat 61, allowing fluid to flow from the inlet 14 to the outlet 15 of the valve body 1, and the cryogenic angle valve is in the open state. When the valve stem 3 moves downward, the valve core 62 blocks the fluid passage on the valve seat 61, cutting off the fluid from the inlet 14 into the valve chamber 11, and the cryogenic angle valve is in the closed state.

[0046] Furthermore, the valve cover assembly 2 is constructed to include an upper valve cover 23, an extended neck 22, and a lower valve cover 21 arranged sequentially from top to bottom in the axial direction, which can be sequentially fixedly connected, for example, by welding. This three-section configuration of the valve cover assembly 2 can reduce production costs and simplify machining. The lower valve cover 21 in the valve cover assembly 2 is directly connected from the upper axial end face of the valve body 1 by means of bolts 24. However, after the lower valve cover 21 is connected to the upper axial end face of the valve body 1, a connection gap will be formed between the lower valve cover 21 and the valve body 1, and fluid entering the valve cavity 11 of the valve body 1 can easily overflow from the cryogenic angle valve through this connection gap.

[0047] To further improve the sealing performance between the lower valve cover 21 and the valve body 1, the cryogenic angle valve according to this utility model is constructed to include a sealing assembly 4. The following is in conjunction with... Figure 2 , Figure 3 and Figure 4 The configuration of sealing component 4 is described in detail.

[0048] Figure 2 A perspective view of sealing assembly 4 is shown. Figure 3 A cross-sectional view taken along one diameter of the sealing assembly 4 is shown. The sealing assembly 4 is constructed to include an annular body 41 and an elastic element capable of being received within the annular body 41. Specifically, a receiving recess 411 is provided on the annular body 41, opening towards the outer periphery of the annular body 41. The receiving recess 411 is recessed from the outer periphery of the annular body towards the center of the annular body 41 and extends continuously throughout the circumference of the annular body 41. Preferably, by providing this receiving recess, the cross-section obtained by taking a section of the annular body 41 along any diameter orientation is designed to be substantially C-shaped, which in Figure 3 This is more clearly visible in the middle.

[0049] Figure 4 A schematic diagram of the connection area between the lower valve cover 21 and the valve body 1 is shown, illustrating the arrangement of the sealing assembly 4 with respect to the lower valve cover 21 and the valve body 1. Specifically, the sealing assembly 4 is arranged axially between the lower valve cover 21 and the valve body 1. In this document, the sealing assembly 4 is to be clamped between the lower valve cover 21 and the valve body 1 in a pre-compressed manner in the axial direction. In other words, after the lower valve cover 21 is connected to the valve body 1 by means of fasteners, the lower valve cover 21 will apply an axially downward compressive force to the sealing assembly 4, and the valve body 1 will apply an axially upward compressive force to the sealing assembly 4.

[0050] The elastic element is preferably a helical spring 42 that extends continuously along the entire circumference of the annular body 41 and is conformally received within the receiving recess 411. Hereinafter, after the helical spring 42 is assembled into the receiving recess 411 and before the sealing assembly 4 is clamped between the lower valve cover 21 and the valve body 1, the helical spring 42 is sized to axially abut against the upper and lower sides of the receiving recess 411, respectively. In this case, the helical spring 42 may abut against only the upper and lower sides of the receiving recess 411 without applying any axial force to the upper and lower sides, or it may apply a partial axial force to the upper and lower sides of the receiving recess 411. Although not shown herein, those skilled in the art will understand that the elastic element may also be, for example, a plurality of springs extending axially and arranged circumferentially at intervals or without intervals, or other elastic components known in the art.

[0051] By employing the sealing assembly 4 with the above configuration, at least the following technical effects can be achieved: After the sealing assembly 4 is clamped between the valve cover 21 and the valve body 1, the helical spring 42, due to axial stress, will apply axially opposite forces to the upper and lower sides of the annular body 41, thereby forcing the upper side of the annular body 41 to tightly abut against the lower valve cover 21, and the lower side of the annular body 41 to tightly abut against the upper shaft end face of the valve body 1. This prevents fluid from overflowing from the gap between the annular body 41 and the lower valve cover 21, and the gap between the annular body 41 and the valve body 1. Furthermore, since the helical spring 42 has already abutted against the upper and lower sides of the receiving recess 411 before the sealing assembly 4 is clamped between the valve cover 21 and the valve body 1, the helical spring 42 can immediately provide feedback to apply a reaction force to the annular body 41 after being subjected to external axial force, thereby enabling the sealing assembly to begin sealing after being positioned. Furthermore, since the helical spring 42 provides continuous axial stress to the annular body 41 inside the annular body 41, even if the annular body 41 is subjected to excessive axial stress, the helical spring 42 can force the annular body 41 to always axially abut against the lower valve cover 21 and the valve body 1, and the annular body 41 is not prone to plastic deformation, thereby ensuring good sealing for a long time.

[0052] A receiving groove 12 is provided at the position where the lower valve cover 21 abuts on the upper axial end face of the valve body 1 to accommodate the sealing assembly 4. Alternatively, a receiving groove may be provided at the position where the lower valve cover 21 abuts on the valve body 1 (this example is not shown herein). The receiving groove 12 may be designed with an axial dimension smaller than the axial dimension of the sealing assembly 4, so that after the sealing assembly 4 is accommodated therein and the lower valve cover 21 is installed onto the valve body 1, the sealing assembly 4 is in an axially pre-compressed state.

[0053] from Figure 4As can be further seen, an axially penetrating valve stem channel 211 is provided in the lower valve cover 21, and the valve stem 3 extends into the valve cavity 11 of the valve body 1 after passing through the valve stem channel 211. Under high pressure, the fluid in the valve cavity 11 may flow to the top of the lower valve cover 21 through the radial gap between the valve stem 3 and the lower valve cover 21. To prevent fluid from overflowing through the radial gap between the valve stem 3 and the lower valve cover 21 and to simultaneously guide the axial movement of the valve stem 3, a radial bushing mechanism is arranged at the radial gap between the valve stem 3 and the lower valve cover 21.

[0054] Figure 1 A first example of a radial bushing mechanism is shown, wherein the radial bushing mechanism includes a first bushing 51 which is connected to the lower section of the valve stem passage 211.

[0055] Figure 4 A second example of a radial bushing mechanism is shown, wherein the radial bushing mechanism includes not only a first bushing 51 but also a second bushing 52. Specifically, the first bushing 51 is attached to the inner peripheral wall of the valve stem passage 211, preferably to the lower portion of the inner peripheral wall of the valve stem passage 211. The first bushing 51 may be pressed into the valve stem passage 211, for example, by an interference fit. The second bushing 52 is held between the first bushing 51 and the lower valve cover 21 (specifically, the inner peripheral wall of the valve stem passage 211) in a manner that allows for elastic deformation in the axial direction. Correspondingly, two corresponding grooves are formed on the inner peripheral wall of the valve stem passage 211 of the lower valve cover 21 for receiving the first bushing 51 and the second bushing 52, respectively.

[0056] After the valve stem 3 passes through the valve stem channel 211, both the first bushing 51 and the second bushing 52 are fitted onto the outer periphery of the valve stem 3 with a clearance fit. In this document, the radial clearance between the first bushing 51 and the valve stem 3 is referred to as the first radial clearance, and the clearance between the second bushing 52 and the valve stem 3 is referred to as the second radial clearance. The second radial clearance is designed to be smaller than the first radial clearance. Preferably, the material hardness of the second bushing 52 is selected to be lower than that of the first bushing 51. For example, the first bushing 51 can be made of a metal material, and the second bushing 52 can be made of polychlorotrifluoroethylene (PTFE).

[0057] In the second example of the radial bushing mechanism, since the second radial gap is smaller than the first radial gap, the liquid can undergo two processes of increased flow velocity and decreased pressure in the process of entering the first radial gap and then immediately entering the second radial gap from the valve cavity, according to the Venturi effect principle. In each process of entering the small gap from the large gap, the flowing liquid is very likely to undergo a phase change and become gas. This will make the upper part of the valve stem channel full of gas, forming an effective vapor barrier, thereby preventing the low temperature liquid below from continuously flowing upward along the first and second radial gaps, effectively avoiding thermal convection between the valve cover and the valve body, and thus reducing heat loss.

[0058] Further, see Figures 4 to 6 In this document, the lower valve cover 21 is connected to the upper shaft end face of the valve body 1 by means of four fasteners, preferably bolts 24. Simultaneously, four threaded holes 13 are correspondingly provided on the upper shaft end face of the valve body 1 for the bolts 24 to be screwed into them one by one. Those skilled in the art should understand that the lower valve cover 21 may also be connected to the valve body 1 by other means (e.g., snap-fit ​​connection, welding). Furthermore, although not shown in the accompanying drawings, those skilled in the art should understand that more bolts can be used as needed to achieve the connection between the lower valve cover and the valve body.

[0059] In this paper, the valve body 1 is preferably forged from aluminum alloy. Aluminum alloy has high specific strength and specific stiffness, good forging and machinability, low critical temperature for cold brittleness, and can maintain good mechanical properties at low temperatures. However, when bolted attachment is used, since the bolts 24 are usually made of stainless steel, the threaded hole 13 is easily damaged and deformed during the screwing of the bolts 24 into the threaded hole 13 due to the softness of aluminum alloy, which significantly affects the service life of the threaded joint.

[0060] To address the aforementioned issues, the cryogenic angle valve in this paper is designed to further include a threaded sleeve 7, preferably made of steel wire, which is inserted one-to-one into the threaded holes 13 opened within the valve body 1, such as... Figure 6 As shown. By providing the aforementioned threaded sleeve 7, after the bolt 24 is inserted into the threaded hole 13 in the valve body 1, the bolt 24 will directly abut against the threaded sleeve 7, thereby ensuring that the stress is evenly distributed on the threaded hole 13 in the valve body 1, thereby extending the service life of the threaded joint between the lower valve cover 21 and the valve body 1, and ensuring the connection stability between the lower valve cover 21 and the valve body 1.

[0061] The following is combined with Figure 1 , Figure 7 and Figure 8The valve stem 3 of the cryogenic angle valve of this invention is described in detail. Unlike the one-piece valve stem in the prior art, the valve stem 3 is designed as a two-piece valve stem herein. The valve stem 3 is constructed to include an upper stem 31 and a lower stem 32. See in particular... Figure 1 The lower axial end of the lower rod 32 can extend into the valve chamber 11 after passing through the valve stem passage 211. The valve core 62 is attached to the lower axial end of the lower rod 32. The upper rod 31 is coaxially connected to the lower rod 32 from the upper axial direction.

[0062] Figure 7 A cross-sectional schematic diagram of the lower member 32 is shown, from... Figure 7 As can be seen, a two-stage stepped hole is provided at the upper axial end of the lower rod 32. That is, a first stepped hole 321 and a second stepped hole 322 are sequentially formed in the axial downward direction starting from the upper shaft end face of the lower rod 32, wherein the diameter of the first stepped hole 321 is larger than the diameter of the second stepped hole 322. Threads are provided on the inner circumferential wall of the second stepped hole 322.

[0063] Figure 8 A cross-sectional schematic diagram of the connection area between the upper member 31 and the lower member 32 is shown. Corresponding to the configuration of the lower member 32, the axially lower end of the upper member 31 includes a first segment 311, a second segment 312, and a third segment 313 with progressively increasing diameters from bottom to top in the axial direction. Threads are provided on the outer peripheral wall of the first segment 311.

[0064] After the upper member 31 is assembled onto the lower member 32, the first member segment 311 is inserted into the second stepped hole 322, the second member segment 312 is inserted into the first stepped hole 321, and the third member segment 313 does not extend into the lower member segment. The first member segment 311 is threadedly connected to the second stepped hole 322. There is no direct connection between the second member segment 312 and the first stepped hole 321, but the first stepped hole 321 is sized to allow the second member segment 312 to be inserted with a clearance fit, thereby achieving the function of guiding and coaxially positioning the second member segment 312.

[0065] Compared to the one-piece valve stem in existing technologies, the two-piece valve stem design described above also ensures good valve stem stability. Furthermore, since two short stems are easier to machine than a single long stem, the valve stem disclosed in this paper is more likely to meet coaxiality requirements and facilitates later maintenance. In addition, later maintenance typically only requires repairing / replacing the lower stem 32, which further reduces maintenance costs.

[0066] Preferably, the lower rod 32 has a constant diameter along the axial direction, and the diameter of the third rod segment 313 is smaller than the diameter of the lower rod 32. This design can save processing costs and reduce processing difficulty while ensuring the strength of the valve stem.

[0067] More preferably, the valve stem 3 is configured to further include an insert 33 made of an elastic material so as to elastically deform under external load. The insert 33 is accommodated at the bottom end of the second stepped hole 322 such that after the upper rod 31 is inserted into the lower rod 32, the first rod segment 311 will press against the insert 33 and cause the insert 33 to elastically deform.

[0068] As the insert 33 undergoes elastic deformation, it will exert an axial upward reaction force on the upper rod 31, which will increase the friction at the threaded connection between the first rod segment 311 and the second stepped hole 322, thereby achieving a good anti-loosening effect.

[0069] See Figure 1 The cryogenic angle valve according to this utility model also includes an insulation cylinder 8, a floating sleeve 9, and a clamp 10. The lower axial end of the insulation cylinder 8 is connected to the valve body, the floating sleeve 9 is arranged on the upper end of the shaft of the insulation cylinder 8, and the clamp 10 is arranged around the outer periphery of the floating sleeve 9 and connects the floating sleeve 9 to the insulation cylinder 8. The entire cryogenic angle valve can be connected to a cold box by means of the floating sleeve; for example, the mating connector of the cold box can be inserted into the gap between the floating sleeve 9 and the insulation cylinder 8. This design realizes an angle valve that can be pulled out online, which facilitates the replacement and maintenance of the valve internals.

[0070] The preferred embodiments of the present invention have been described above with reference to specific examples. It is understood that the above description is exemplary and not restrictive, and various modifications and variations can be conceived by those skilled in the art without departing from the scope of the present invention. These modifications and variations are also included within the scope of protection of this application.

Claims

1. Cryogenic angle valve, characterized in that, Comprise: a valve body (1) having a valve cavity (11) and a flow inlet (14) and a flow outlet (15) in fluid communication with the valve cavity (11) inside the valve body (1); a valve cover assembly (2) attached to the valve body (1) from the axial upper side of the valve body (1); a valve stem (3) inserted into the valve cover assembly (2) and capable of extending into the valve cavity (11); and a sealing assembly (4) axially clamped between the valve cover assembly (2) and the valve body (1) in an axially pre-compressed manner.

2. Cryogenic angle valve according to claim 1, characterized in that The sealing assembly (4) comprises an annular body (41) and an elastic element, an accommodating recess (411) recessed towards the center of the annular body (41) and continuously extending along the entire circumference of the annular body (41) is formed on the outer peripheral side of the annular body (41), and the elastic element is conformably accommodated in the accommodating recess (411) to respectively abut to the upper side and the lower side of the accommodating recess (411) in the axial direction.

3. Cryogenic angle valve according to claim 2, characterized in that The cross section of the annular body (41) taken in any diametrical orientation is substantially C-shaped.

4. The cryogenic angle valve of claim 2, wherein, The elastic element adopts a helical spring (42) continuously extending along the entire circumference of the annular body (41).

5. The cryogenic angle valve of claim 1, wherein, An accommodating groove (12) is formed on the section of the upper axial end face of the valve body (1) abutting against the valve cover assembly (2), and the sealing assembly (4) is installed in the accommodating groove (12).

6. Cryogenic angle valve according to any of claims 1 to 5, characterized in that The valve cover assembly (2) comprises a lower valve cover (21) directly connected to the upper axial end face of the valve body (1), and an axially through valve stem passage (211) is formed in the lower valve cover (21), and the valve stem (3) extends into the valve cavity (11) through the valve stem passage (211).

7. Cryogenic angle valve according to claim 6, characterized in that The low-temperature angle valve further comprises a first bushing (51) and a second bushing (52), both of which are sleeved on the outside of the valve stem (3) in a clearance fit manner, the first bushing (51) is installed to the lower section of the inner peripheral wall of the valve stem passage (211), and the second bushing (52) is clamped between the first bushing (51) and the lower valve cover (21) in an elastically deformed manner in the axial direction.

8. Cryogenic angle valve according to claim 7, characterized in that The hardness of the second bushing (52) is less than that of the first bushing (51).

9. Cryogenic angle valve according to claim 8, characterized in that The first radial gap is between the first bushing (51) and the valve stem (3), and the second radial gap is between the second bushing (52) and the valve stem (3), and the second radial gap is smaller than the first radial gap.

10. The cryogenic angle valve of claim 6, wherein, The valve stem (3) is configured to comprise an upper stem member (31) and a lower stem member (32), the axial lower end of the lower stem member (32) extends into the valve cavity (11) through the valve stem passage (211), and the axial lower end of the upper stem member (31) is coaxially connected to the axial upper end of the lower stem member (32).

11. The low-temperature angle valve according to claim 10, wherein An axial upper end of the lower rod member (32) comprises a first stepped hole (321) and a second stepped hole (322) which are opened from an upper axial end face of the lower rod member (32) and have diameters decreasing sequentially from top to bottom in the axial direction; An axial lower end of the upper rod member (31) comprises a first rod segment (311), a second rod segment (312) and a third rod segment (313) which have diameters increasing sequentially from bottom to top in the axial direction; After the upper rod member (31) is connected to the lower rod member (32), the first rod segment (311) is threadedly connected with the second stepped hole (322), and the second rod segment (312) is inserted into the first stepped hole (321) in a clearance fit manner.

12. Cryogenic angle valve according to claim 11, characterized in that The valve stem (3) further comprises an insert (33) accommodated at a bottom of the second stepped hole (322), wherein, after the first rod segment (311) is screwed into the second stepped hole (322), the first rod segment (311) presses against the insert (33) to cause elastic deformation of the insert (33).

13. The cryogenic angle valve of claim 11, wherein, The lower rod member (32) has a constant diameter in the axial direction, and the diameter of the third rod segment (313) is smaller than that of the lower rod member (32).

14. The cryogenic angle valve of claim 6, wherein, The lower valve cover (21) is attached to the valve body (1) by means of at least four fasteners, and at least four threaded holes (13) are opened on an upper axial end face of the valve body (1) for the fasteners to be screwed into one by one, wherein a threaded sleeve (7) is correspondingly arranged in each threaded hole (13) of the valve body (1).

15. The cryogenic angle valve of claim 6, wherein, The valve cover assembly (2) further comprises an upper valve cover (23) and an elongated neck (22), and the upper valve cover (23), the elongated neck (22) and the lower valve cover (21) are sequentially connected together in the axial direction from top to bottom.

16. The cryogenic angle valve of claim 1, wherein, The cryogenic angle valve further comprises a heat preservation cylinder (8), a floating sleeve (9) and a clamp (10), and the floating sleeve (9) is attached to an upper axial end of the heat preservation cylinder (8) by means of the clamp (10).

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