Ultralow-temperature double-self-sealing high-pressure regulating valve

Abstract

The ultralow-temperature double-self-sealing high-pressure regulating valve comprises a valve body, a valve seat, a sleeve, a valve cover, a support, a valve rod and an executing mechanism, the support is connected with the valve cover through a bolt, and the upper end of the support is fixedly connected with the executing mechanism through a bolt; a pressing ring is arranged at the top of the sleeve; the valve seat is fixed on the valve body through a sleeve, a pressing ring and a check ring, and a first self-seal is adopted between the valve cover and the valve body; a stuffing box is arranged in the valve cover, a corrugated pipe assembly is installed between the valve rod and the stuffing box, the lower end of the corrugated pipe assembly is connected with a corrugated pipe connecting disc, the corrugated pipe connecting disc is connected with the valve rod, the upper end of the corrugated pipe assembly is connected with the stuffing box, and the stuffing box and the valve cover directly adopt second self-sealing. The corrugated pipe assembly is additionally arranged, the two-way self-sealing design is adopted, it can be guaranteed that zero leakage is achieved under the large-diameter ultralow-temperature high-pressure working condition, and the larger the working condition medium pressure is, the better the sealing performance is.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-pressure regulating valves, and particularly relates to an ultra-low temperature double self-sealing high-pressure regulating valve. Background Art

[0002] Cryogenic media usually have the characteristics of being flammable and explosive. For example, media such as liquefied natural gas have relatively high requirements for valve sealing. Currently, the valve body and valve cover of ultra-low temperature regulating valves are generally connected by bolts, and the middle bolts provide the pre-tightening force required for sealing and resist the media force generated in the middle. In an ultra-low temperature and ultra-high pressure environment, it is difficult to meet the design requirements only by bolt pre-tightening. Especially when the design pressure reaches 1500LB and above, there are potential hazards with only bolt pre-tightening. Valves with self-sealing structures are widely used in high-pressure working conditions. However, since ultra-low temperature valves are used under special working conditions, generally with an operating temperature below -101 degrees Celsius and the need to ensure above 0 degrees Celsius at the packing position, to ensure the normal operation of the packing, it is usually necessary to lengthen the valve cover structure and drip tray. And the valve cover of the self-sealing structure is currently only used in high-temperature or normal-temperature working conditions due to its structural compactness. Although the existing globe valves have self-sealing structures, it is found through actual application that leakage will occur under high pressure at low temperatures.

[0003] For example, the Chinese invention patent application with the authorization publication number CN 118030943 A discloses an ultra-low temperature multi-sealing high-pressure globe valve, including a valve body, a valve flap, a valve stem, a valve cover, and a bracket; the outer sealing surface of the valve cover and the inner sealing surface of the wedge-shaped sealing ring are welded with hard alloy and have a hardness difference, forming a first self-sealing sealing surface after assembly. There are PCTFE sealing rings, lip seals, and metal wound gaskets between the bracket and the valve body, cooperating to form a second middle self-sealing. As the pressure increases, the sealing performance of the PCTFE sealing ring will also be better, preventing leakage of the valve when the first self-sealing fails. This valve structure can solve the problem of easy leakage in the middle of the valve under large-diameter ultra-low temperature and high-pressure working conditions. The greater the working medium pressure, the better the sealing performance, thus ensuring the sealing performance of the globe valve under high pressure and reducing the external leakage of the medium. However, only the middle sealing is considered in this globe valve. The stuffing box and the valve cover are integrally designed, and the two self-sealings are together. The sealing at the valve stem still uses the conventional method, and it is found that leakage will occur under high pressure at low temperatures after using for a period of time. Summary of the Invention

[0004] The valve cover of the present invention adopts a self-sealing structure. Firstly, it is the self-sealing structure between the valve cover and the wedge block. The initial pre-tightening force is provided by pre-tightening the nut on the restraint ring, thereby providing the initial sealing force. When the pressure in the middle cavity increases, the fit between the valve cover and the wedge block will be tighter, achieving the self-sealing effect. The medium force is borne by the four-way split ring and finally acts on the valve body. Secondly, it is the self-sealing structure between the stuffing box and the wedge block. The initial pre-tightening force is provided by pre-tightening the nut on the restraint ring, thereby providing the initial sealing force. When the pressure in the middle cavity increases, the fit between the stuffing box and the wedge block will be tighter, achieving the self-sealing effect. The medium force is borne by the four-way split ring and finally acts on the valve cover. A bellows assembly is welded on the valve stem, which can ensure zero external leakage at the valve stem. Even if the bellows fails, there is still the packing + lip seal to provide secondary guarantee for sealing to prevent external leakage of the valve.

[0005] Aiming at the problems existing in the prior art, the present invention proposes an ultra-low temperature double self-sealing high-pressure regulating valve. The valve cover adopts a self-sealing structure. Firstly, it is the self-sealing structure between the valve cover and the wedge block. The initial pre-tightening force is provided by pre-tightening the nut on the restraint ring, thereby providing the initial sealing force. When the pressure in the middle cavity increases, the fit between the valve cover and the wedge block will be tighter, achieving the self-sealing effect. The medium force is borne by the four-way split ring and finally acts on the valve body. Then, it is the self-sealing structure between the stuffing box and the wedge block. The initial pre-tightening force is provided by pre-tightening the nut on the restraint ring, thereby providing the initial sealing force. When the pressure in the middle cavity increases, the fit between the stuffing box and the wedge block will be tighter, achieving the self-sealing effect. The medium force is borne by the four-way split ring and finally acts on the valve cover. A bellows assembly is welded on the valve stem, which can ensure zero external leakage at the valve stem. Even if the bellows fails, there is still the packing + lip seal to provide secondary guarantee for sealing to prevent external leakage of the valve. Since the bellows is welded to the stuffing box, the elastic compression force at the bellows will also assist in the sealing between the stuffing box and the wedge block. The regulating valve spool adopts a balanced design, and the flow direction can adopt the structure of high inlet and low outlet. The medium force is used to assist in sealing. The double spool balanced cage design can reduce the opening and closing torque of the valve stem and reduce the unbalanced force borne by the valve stem. This structure can effectively solve the sealing problem of the regulating valve in the ultra-low temperature and ultra-high pressure environment and can be used in the ultra-low temperature and high pressure environment with a design pressure reaching 1500LB and above.

[0006] The present invention provides an ultra-low temperature double self-sealing high-pressure regulating valve, which comprises a valve body, a valve seat, a sleeve, a valve cover, a bracket, a valve stem and an actuator. The bracket is connected to the valve cover by bolts, and the upper end of the bracket is fixedly connected to the actuator by bolts; a retaining ring is provided at the top of the sleeve; the valve seat is fixed on the valve body through the sleeve, the retaining ring and a snap ring. A first self-sealing is adopted between the valve cover and the valve body; a stuffing box is provided inside the valve cover, and a bellows assembly is installed between the valve stem and the stuffing box. The lower end of the bellows assembly is connected to a bellows connecting disc, the bellows connecting disc is connected to the valve stem, the upper end of the bellows assembly is connected to the stuffing box, and a second self-sealing is directly adopted between the stuffing box and the valve cover. The present invention adds a bellows assembly 17, which can ensure zero leakage under the conditions of large diameter, ultra-low temperature and high pressure. The greater the pressure of the working medium, the better the sealing performance.

[0007] Preferably, a large valve core and a small valve core are further provided inside the valve body, and the large valve core and the small valve core are slidably installed in the sleeve and the retaining ring. The double-valve-core balanced cage design can reduce the opening and closing torque of the valve stem and the unbalanced force borne by the valve stem; the valve core adopts a balanced design, and the flow direction can adopt a high-in and low-out structure, using the medium force to assist in sealing.

[0008] In any of the above solutions, preferably, a lip seal ring and packing are placed inside the upper side of the stuffing box, the packing is pressed tightly by a packing gland, and the spherical surface at the top of the packing gland cooperates with the spherical surface at the lower side of the packing pressing plate.

[0009] In any of the above solutions, preferably, a stuffing box restraint ring is provided at the opening at the top of the valve cover, and the stuffing box restraint ring is connected to the stuffing box through a connecting component. The connecting component includes a fully threaded bolt, an upper hexagon nut, a disc spring and a lower hexagon nut.

[0010] In any of the above solutions, preferably, a middle wedge-shaped sealing ring, a middle gasket and a middle four-way split ring are provided at the contact part between the valve cover and the valve body. The middle gasket is located above the middle wedge-shaped sealing ring and below the middle four-way split ring; the middle four-way split ring is located in the groove at the middle part of the valve body.

[0011] In any of the above solutions, preferably, hard alloy is surfacing welded on the outer wedge-shaped sealing surface of the valve body and the valve cover and the inner sealing surface of the middle wedge-shaped sealing ring, and there is a hardness difference.

[0012] In any of the above solutions, preferably, a stuffing box wedge-shaped sealing ring and a stuffing box four-way split ring are provided at the contact part between the valve cover and the stuffing box. The stuffing box four-way split ring is located in the groove at the middle part of the stuffing box; hard alloy is surfacing welded on the outer wedge-shaped sealing surface of the stuffing box and the inner sealing surface of the stuffing box wedge-shaped sealing ring, and there is a hardness difference.

[0013] In any of the above solutions, preferably, a shaft sleeve is provided at the lower end between the valve cover and the valve stem, so that the valve stem can slide up and down smoothly inside the valve cover.

[0014] Preferably, in any of the above solutions, the lower end of the bracket is fixedly connected to the valve body through a bracket bolt and a bracket hexagonal nut; a middle restraint ring is provided at the connection between the bracket and the valve cover, and the middle restraint ring and the valve cover are connected together through a middle tension bolt and a hexagonal nut.

[0015] Preferably, in any of the above solutions, a drip tray is welded to the middle part of the valve cover; heat dissipation grooves are formed on the outer side of the middle part of the valve cover. A drip tray is welded to the valve cover and heat dissipation grooves are formed, ensuring that the packing can reach a working temperature above 0°C even under low-temperature conditions to ensure its normal operation; the setting of the disc spring can ensure that the packing has a stable compression force under alternating load conditions.

[0016] The ultra-low temperature double self-sealing high-pressure regulating valve of the present invention has the following advantages: First, it is the first self-sealing structure between the valve cover and the wedge block. The initial pre-tightening force is provided by pre-tightening the nut on the restraint ring, thereby providing the initial sealing force. When the pressure in the middle cavity increases, the fit between the valve cover and the wedge block will be tighter, realizing the self-sealing function. The medium force is borne by the four-open ring and finally acts on the valve body. Then it is the second self-sealing structure between the stuffing box and the wedge block. The initial pre-tightening force is provided by pre-tightening the nut on the restraint ring, thereby providing the initial sealing force. When the pressure in the middle cavity increases, the fit between the stuffing box and the wedge block will be tighter, realizing the self-sealing function. The medium force is borne by the four-open ring and finally acts on the valve cover.

[0017] Explanation of the reference numerals in the drawings

[0018] Valve body 1, valve seat 2, large valve core 3, sleeve 4, small valve core 5, retaining ring 6, snap ring 7, middle wedge-shaped sealing ring 8, middle washer 9, middle four-open ring 10, valve cover 11, middle restraint ring 12, middle tension bolt 13, hexagonal nut 14, bracket 15, drip tray 16, bellows assembly 17, valve stem 18, stuffing box wedge-shaped sealing ring 19, stuffing box four-open ring 20, stuffing box 21, lip-shaped sealing ring 22, packing 23, bushing 24, bellows connection plate 25, bracket bolt 26, bracket hexagonal nut 27, packing gland 28, packing pressing plate 29, disc spring 30, stuffing box restraint ring 31, fully threaded bolt 32, upper hexagonal nut 33, actuator 34, heat dissipation groove 35, lower hexagonal nut 36. Explanation of the drawings

[0019] Figure 1 It is a schematic structural diagram of a preferred embodiment of the ultra-low temperature double self-sealing high-pressure regulating valve according to the present invention.

[0020] Figure 2 It is for the ultra-low temperature double self-sealing high-pressure regulating valve according to the present invention Figure 1 The enlarged view at A in the shown preferred embodiment.

[0021] Figure 3 In the cryogenic double self-sealing high-pressure regulating valve according to the present invention Figure 1 The enlarged view at position B in the preferred embodiment shown

[0022] Figure 4 In the cryogenic double self-sealing high-pressure regulating valve according to the present invention Figure 1 The internal structure schematic diagram of the stuffing box in the preferred embodiment shown Detailed implementation manners

[0023] The present invention will be further described below in conjunction with the drawings and embodiments

[0024] As Figure 1 、 Figure 2 shown, a cryogenic double self-sealing high-pressure regulating valve includes a valve body 1, a valve seat 2, a sleeve 4, a valve cover 11, a bracket 15, a valve stem 18 and an actuator 34. The bracket 15 is bolted to the valve cover 11, and the upper end of the bracket 15 is bolted to fix the actuator 34; a retaining ring 6 is provided at the top of the sleeve 4; the valve seat 2 is fixed to the valve body 1 through the sleeve 4, the retaining ring 6 and a snap ring 7, and a first self-sealing is adopted between the valve cover 11 and the valve body 1; a stuffing box 21 is provided in the valve cover 11, and a bellows assembly 17 is installed between the valve stem 18 and the stuffing box 21. The lower end of the bellows assembly 17 is connected to a bellows connection disc 25, the bellows connection disc 25 is connected to the valve stem 18, the upper end of the bellows assembly 17 is connected to the stuffing box 21, and a second self-sealing is directly adopted between the stuffing box 21 and the valve cover 11. The present invention adds a bellows assembly 17 to ensure zero leakage under large-diameter cryogenic high-pressure working conditions. The greater the working medium pressure, the better the sealing performance

[0025] When the valve is in the closed state, the bellows assembly 17 is in a normal state. When the valve is partially opened or fully opened, the bellows assembly 17 is in a compressed state. Since the upper end of the bellows assembly 17 is welded to the stuffing box 21, the elastic return force of the bellows assembly 17 will act on the stuffing box 21. At this time, the outer wedge-shaped sealing surface of the stuffing box 21 will be closer and closer to the inner sealing surface of the stuffing box wedge-shaped sealing ring 19 under the action of the return force, and the greater the opening degree, the better the effect

[0026] When the valve is in the fully open state, the upper sealing surface of the boss on the valve stem 18 is in a fitting and sealing state with the inner upper sealing surface of the stuffing box 21. At this time, if the valve stem 18 is acted on by the medium force, it will also be closer and closer to the upper sealing surface, and the acting force here will be transmitted to the stuffing box 21 and the stuffing box wedge-shaped sealing ring 19 to assist the sealing between the outer wedge-shaped sealing surface of the stuffing box 21 and the inner sealing surface of the stuffing box wedge-shaped sealing ring 19

[0027] Triple-seal design with bellows, lip seal and packing. A bellows assembly 17 is welded to the valve stem 18, which can ensure zero external leakage at the valve stem 18. Even if the bellows fails, the packing and lip seal provide secondary sealing protection to prevent external leakage of the valve (as shown in combination with Figures 1 - 3 .

[0028] In this embodiment, a large valve core 3 and a small valve core 5 are further provided in the valve body 1, and the large valve core 3 and the small valve core 5 are slidably installed in the sleeve 4 and the retaining ring 6. The double-valve-core balanced cage design can reduce the opening and closing torque of the valve stem and the unbalanced force borne by the valve stem; the valve core adopts a balanced design, and the flow direction can adopt a high-inlet and low-outlet structure, using the medium force to assist in sealing.

[0029] In this embodiment, a drip tray 16 is welded to the middle part of the valve cover 11; a heat dissipation groove 35 is opened on the outside of the middle part of the valve cover 11 (as shown in Figure 1 ). A drip tray 16 is welded to the valve cover 11 and a heat dissipation groove 35 is opened, ensuring that the packing can reach a working temperature above 0°C even under low-temperature conditions to ensure its normal operation; the setting of the disc spring 30 can ensure that the packing has a stable compression force under alternating load conditions.

[0030] In this embodiment, a lip seal 22 and packing 23 are placed inside the upper side of the stuffing box 21, and the packing 23 is compressed by a packing gland 28. The top spherical surface of the packing gland 28 is matched with the spherical surface on the lower side of the packing plate 29.

[0031] In this embodiment, a stuffing box restraint ring 31 is provided at the top opening of the valve cover 11. The stuffing box restraint ring 31 is connected to the stuffing box 21 through a connecting component, and the connecting component includes a fully threaded bolt 32, an upper hexagon nut 33, a disc spring 30 and a lower hexagon nut 36.

[0032] During operation, the valve cover 11 is pulled by turning the hexagon nut 14 on the stuffing box restraint ring 31 to provide an initial pre-tightening force for the sealing surface of the stuffing box 21 and the stuffing box wedge-shaped sealing ring 19, providing an initial sealing force; when the pressure in the middle cavity increases, the stuffing box 21 and the stuffing box wedge-shaped sealing ring 19 will be pressed tighter and tighter to achieve self-sealing. The medium force is borne by the four-open ring 20 of the stuffing box and finally acts on the valve cover 11.

[0033] In this embodiment, a middle-way wedge-shaped sealing ring 8, a middle-way washer 9 and a middle-way four-open ring 10 are provided at the contact part between the valve cover 11 and the valve body 1. The middle-way washer 9 is located above the middle-way wedge-shaped sealing ring 8 and below the middle-way four-open ring 10; the middle-way four-open ring 10 is located in the groove at the middle part of the valve body 1.

[0034] In this embodiment, hard alloy is surfacing welded on the outer wedge-shaped sealing surface of the valve body 1 and the valve cover 11 and the inner sealing surface of the middle-way wedge-shaped sealing ring 8, and there is a hardness difference.

[0035] In this embodiment, the lower end of the bracket 15 is fixedly connected to the valve body 1 through the bracket bolt 26 and the bracket hexagon nut 27; a middle channel restraint ring 12 is provided at the connection between the bracket 15 and the valve cover 11, and the middle channel restraint ring 12 and the valve cover 11 are connected together through the middle channel tensioning bolt 13 and the hexagon nut 14.

[0036] During operation, the valve cover 11 is pulled by screwing the hexagon nut 14 on the middle channel restraint ring 12 to provide an initial pre-tightening force for the sealing surface of the valve cover 11 and the middle channel wedge-shaped sealing ring 8, providing an initial sealing force; when the pressure in the middle cavity increases, the fit between the valve cover 11 and the middle channel wedge-shaped sealing ring 8 will be pressed tighter and tighter, realizing the self-sealing function. The medium force is borne by the middle channel four-opening ring 10 and finally acts on the valve body 1.

[0037] Refer to Figure 3 As shown in the ultra-low temperature double self-sealing high-pressure regulating valve according to the present invention Figure 1 The enlarged view at position B in the preferred embodiment shown.

[0038] In this embodiment, a stuffing box wedge-shaped sealing ring 19 and a stuffing box four-opening ring 20 are provided at the contact part between the valve cover 11 and the stuffing box 21 (see Figure 4 As shown), the stuffing box four-opening ring 20 is located in the groove at the middle part of the stuffing box 21; the outer wedge-shaped sealing surface of the stuffing box 21 and the inner sealing surface of the stuffing box wedge-shaped sealing ring 19 are surfacing welded with hard alloy and have a hardness difference.

[0039] In this embodiment, a bushing 24 is provided at the lower end between the valve cover 11 and the valve stem 18 to enable the valve stem 18 to slide smoothly up and down in the valve cover 11.

[0040] Combined with Figure 1 、 Figure 3 As shown, when the valve of this example is in the closed state, the bellows assembly 17 is in the normal state at this time. When the valve is partially opened or fully opened, the bellows assembly 17 is in the compressed state at this time. Since the upper end of the bellows assembly 17 is welded to the lower end of the stuffing box 21, the elastic resilience of the bellows assembly 17 will act on the stuffing box 21. At this time, the outer wedge-shaped sealing surface of the stuffing box 21 and the inner sealing surface of the stuffing box wedge-shaped sealing ring 19 will be pressed closer and closer, assisting the sealing of this sealing surface.

[0041] Finally, combined with Figure 1 、 Figure 4As shown, a hard alloy is surfacing-welded on the upper sealing surface at the inner side of the stuffing box 21 and the upper boss on the valve stem 18, and there is a hardness difference. When the valve is in the fully open state, the upper sealing surface of the upper boss on the valve stem 18 is in a fitting and sealing state with the upper sealing surface at the inner side of the stuffing box 21. At this time, if the valve stem 18 is affected by the medium force, it will also fit more tightly with the upper sealing surface, and the force here will be transmitted to the stuffing box 21 and the stuffing box wedge-shaped sealing ring 19, assisting the sealing between the outer wedge-shaped sealing surface of the stuffing box 21 and the inner sealing surface of the stuffing box wedge-shaped sealing ring 19.

[0042] Those skilled in the art can easily understand that the cryogenic double self-sealing high-pressure regulating valve of the present invention includes any combination of the various parts in this specification. Limited by the space and for the sake of conciseness of the specification, these combinations are not introduced in detail one by one here. However, after reading this specification, the scope of the present invention constituted by any combination of the various parts formed by this specification is self-evident.

Claims

1. A cryogenic double self-sealing high-pressure regulating valve, which comprises a valve body (1), a valve seat (2), a sleeve (4), a valve cover (11), a bracket (15), a valve stem (18) and an actuator (34). The bracket (15) is bolted to the valve cover (11), and the upper end of the bracket (15) is bolted to fix the actuator (34). A retaining ring (6) is provided at the top of the sleeve (4). The valve seat (2) is fixed to the valve body (1) through the sleeve (4), the retaining ring (6) and a snap ring (7), and is characterized in that: A first self-sealing is adopted between the valve cover (11) and the valve body (1); a stuffing box (21) is provided inside the valve cover (11), a bellows assembly (17) is installed between the valve stem (18) and the stuffing box (21), the lower end of the bellows assembly (17) is connected to the bellows connection disc (25), the bellows connection disc (25) is connected to the valve stem (18), the upper end of the bellows assembly (17) is connected to the stuffing box (21), and a second self-sealing is directly adopted between the stuffing box (21) and the valve cover (11).

2. The cryogenic double self-sealing high-pressure regulating valve according to claim 1, characterized in that: A large valve core (3) and a small valve core (5) are also provided inside the valve body (1), and the large valve core (3) and the small valve core (5) are slidably installed inside the sleeve (4) and the retaining ring (6).

3. The cryogenic double self-sealing high-pressure regulating valve according to claim 1, wherein: A lip seal ring (22) and packing (23) are placed inside the upper side of the stuffing box (21), the packing (23) is compressed by a packing gland (28), and the top spherical surface of the packing gland (28) is matched with the spherical surface on the lower side of the packing pressing plate (29).

4. The cryogenic double self-sealing high-pressure control valve according to claim 1, characterized in that: A stuffing box restraining ring (31) is provided at the top opening of the valve cover (11), and the stuffing box restraining ring (31) is connected to the stuffing box (21) through a connection assembly, and the connection assembly includes a fully threaded bolt (32), an upper hexagon nut (33), a disc spring (30), and a lower hexagon nut (36).

5. The cryogenic double self-sealing high-pressure control valve according to claim 1, characterized in that: A middle wedge-shaped sealing ring (8), a middle washer (9), and a middle four-split ring (10) are provided at the contact part between the valve cover (11) and the valve body (1), the middle washer (9) is located above the middle wedge-shaped sealing ring (8) and below the middle four-split ring (10); the middle four-split ring (10) is located in the groove at the middle part of the valve body (1).

6. The cryogenic double self-sealing high-pressure regulating valve according to claim 5, wherein: Hard alloy is surfacing welded on the outer wedge-shaped sealing surface of the valve body (1) and the valve cover (11) and the inner sealing surface of the middle wedge-shaped sealing ring (8), and there is a hardness difference.

7. The cryogenic double self-sealing high-pressure regulating valve according to claim 1 or 4, characterized in that: A stuffing box wedge-shaped sealing ring (19) and a stuffing box four-split ring (20) are provided at the contact part between the valve cover (11) and the stuffing box (21), the stuffing box four-split ring (20) is located in the groove at the middle part of the stuffing box (21); hard alloy is surfacing welded on the outer wedge-shaped sealing surface of the stuffing box (21) and the inner sealing surface of the stuffing box wedge-shaped sealing ring (19), and there is a hardness difference.

8. The cryogenic double self-sealing high-pressure regulating valve according to claim 1, wherein: A bushing (24) is provided at the lower end between the valve cover (11) and the valve stem (18).

9. The cryogenic double self-sealing high-pressure regulating valve according to claim 1, characterized in that: The lower end of the bracket (15) is fixedly connected to the valve body (1) through a bracket bolt (26) and a bracket hexagon nut (27); a middle restraining ring (12) is provided at the connection part between the bracket (15) and the valve cover (11), and the middle restraining ring (12) and the valve cover (11) are connected together through a middle tension bolt (13) and a hexagon nut (14).

10. The cryogenic double self-sealing high-pressure regulating valve according to any one of claims 1 or 4-6, characterized in that: A drip tray (16) is welded at the middle part of the valve cover (11); heat dissipation grooves (35) are opened on the outer side of the middle part of the valve cover (11).

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