Double-row low-temperature safety valve

Abstract

The invention provides a double-row low-temperature safety valve and relates to the technical field of safety valves, the double-row low-temperature safety valve comprises a main valve body, a valve cover and a pilot valve assembly, an inlet runner and an outlet runner are arranged in the main valve body, a guide sleeve is arranged in the main valve body, a first valve element is arranged in the guide sleeve in a sliding mode, and a valve seat is arranged in the main valve body; a first sealing piece is arranged at the lower end of the first valve element, a medium containing cavity is formed between the first valve element and the valve deck and located in the guide sleeve, the pilot valve assembly is communicated with the medium containing cavity and the inlet flow channel, and the first sealing piece and the valve seat can elastically deform. The medium containing cavity is filled with media to form pressure towards the valve seat on the first valve element, so that the first sealing piece extrudes the valve seat. According to the safety valve, the first valve element and the valve seat can both deform, the sealing performance of the valve seat and the first valve element under the low-temperature working condition is guaranteed, and the sealing performance between the first valve element and the guide sleeve is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of safety valves, and in particular to a double-row low-temperature safety valve. Background Art

[0002] In many industrial fields, especially in the storage and transportation of liquefied natural gas, cryogenic refrigeration systems, and aerospace cryogenic fuel systems involving low-temperature conditions, safety assurance is of vital importance. As a key overpressure protection device, the performance of the safety valve is directly related to the safety of the entire system. With the continuous development of technology, low-temperature conditions have put forward more and more stringent requirements on safety valves. Traditional single-row safety valves have gradually exposed many limitations in low-temperature environments, which has prompted the development of double-row cryogenic safety valves. From the perspective of fluid dynamics, cryogenic fluids often have special rheological properties, such as increased viscosity and complex flow rate changes. When a single-row safety valve is dealing with these complex fluid conditions, the flow channel is prone to blockage, vortexes, etc., which affects the opening and closing performance of the safety valve, and thus cannot effectively and timely protect the system from overpressure. The double-row cryogenic safety valve can better guide the fluid flow, reduce flow resistance, and reduce vortex formation through the optimized design of the double-row flow channel, ensuring that the safety valve operates stably and reliably under low-temperature complex fluid conditions.

[0003] Under low temperature conditions, the physical properties of materials will change significantly. For example, the toughness of metal materials decreases and the thermal expansion coefficient decreases, which poses a great challenge to the sealing of the valve seat and the first valve core. At low temperatures, due to the thermal expansion and contraction effect of the valve seat and the first valve core, the matching clearance between the two is difficult to accurately control, and it is very easy to have a poor seal. If the seal is not tight, on the one hand, it will cause medium leakage and cause energy waste; on the other hand, the leaked medium may quickly vaporize in the surrounding environment to form a flammable and explosive mixed gas, posing a serious safety hazard. Therefore, it is of great practical significance to design a double-row safety valve that still has good sealing performance under low temperature conditions. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a double-row cryogenic safety valve.

[0005] The technical scheme adopted by the present invention is as follows: a double-row low-temperature safety valve, comprising a main valve body, a valve cover and a pilot valve assembly, the valve cover is arranged on the upper end surface of the main valve body, an inlet flow channel and an outlet flow channel are arranged in the main valve body, the outlet flow channel comprises a first outlet flow channel and a second outlet flow channel respectively located on both sides of the inlet flow channel, a guide sleeve is arranged in the main valve body, a first valve core is slidably arranged in the guide sleeve, and a valve seat is arranged in the main valve body between the first outlet flow channel and the second outlet flow channel, a first mounting groove is arranged at one end of the first valve core close to the inlet flow channel, a first sealing member is arranged in the first mounting groove, and the first sealing member and the valve seat form a first sealing surface, a medium accommodating chamber is formed in the guide sleeve between the first valve core and the valve cover, the pilot valve assembly is communicated with the medium accommodating chamber and the inlet flow channel, and the first sealing member and the valve seat can both be elastically deformed, when the valve seat and the first sealing member are in sealing cooperation, the medium accommodating chamber is filled with medium to form a pressure on the first valve core in the direction of the valve seat, so that the first sealing member squeezes the valve seat, and the area of ​​the first sealing surface increases.

[0006] The diameter of the first sealing member gradually increases along a direction approaching the inlet flow channel, and the diameter of the valve seat gradually decreases along a direction away from the inlet flow channel.

[0007] The main valve body is provided with a first groove behind the valve seat, and the main valve body is provided with a convex block toward the first groove. The valve seat, the first groove and the convex block form a bend connecting the inlet flow channel and the outlet flow channel.

[0008] The lower end of the first sealing member extends toward the outlet flow channel to form a sealing protrusion, and the sealing protrusion is located in the first groove. The medium containing cavity is filled with medium to exert pressure on the first valve core toward the valve seat, so that when the first sealing member abuts against the first groove, the sealing protrusion and the first groove form a second sealing surface, and the area of ​​the first sealing surface is the largest at this time.

[0009] A first mounting ring is arranged between the first sealing member and the first valve core, a fourth mounting groove matched with the first mounting ring is arranged on the outer periphery of the first sealing member, the first mounting ring is arranged in the fourth mounting groove, and the first mounting ring abuts against the first valve core at one end away from the first sealing member.

[0010] The fourth mounting groove is provided with a third groove at one end close to the valve seat, and a fourth groove is provided at one end of the fourth mounting groove away from the valve seat. The first mounting ring is provided with a first limiting protrusion and a second limiting protrusion at both ends respectively, the third groove is interference fit with a limiting protrusion, and the fourth groove is interference fit with the second limiting protrusion.

[0011] A second valve core is provided at the lower end of the first valve core, and the second valve core includes a connecting rod and a non-deformable support block, one end of the connecting rod is connected to the first valve core and the other end is connected to the support block, the support block is located in the inlet flow channel, and the outer wall of the support block abuts against the valve seat to form a fourth sealing surface.

[0012] The cross-sectional shape of the support block away from the first valve core is adapted to the shape of the valve seat, and the diameter of the support block close to the first valve core gradually decreases, and the support block close to the first valve core forms a guide groove with the inner wall of the first valve core.

[0013] The double-row low-temperature safety valve also includes a cleaning assembly, which includes a second mounting ring and a connecting column. The outer periphery of the second mounting ring is provided with a plurality of convex rings distributed along the axial direction, and the convex rings abut against the valve seat. The connecting column is connected to the support block so that the connecting column and the support block move synchronously.

[0014] A plurality of support plates are arranged between the second mounting ring and the connecting column along the circumferential direction, and connecting grooves are formed between adjacent support plates, and the connecting grooves are communicated with the inlet flow channel.

[0015] The beneficial effects of the present invention are as follows: 1. The safety valve of the present invention has high flow capacity and can be applied to large flow conditions; 2. The first valve core and the valve seat of the safety valve of the present invention can both be deformed, thereby ensuring the sealing performance of the valve seat and the first valve core under low temperature conditions; 3. The safety valve of the present invention is provided with a bend to reduce the impact force of the fluid on the valve body or the subsequent pipeline, and significantly reduce the occurrence of cavitation; 4. The present invention is provided with a second valve core, which provides support for the valve seat and improves the service life and sealing performance of the valve seat; 5. The present invention is provided with a cleaning component to prevent the valve seat from being worn by impurities, thereby extending the service life of the valve seat; 6. The sealing performance between the first valve core and the guide sleeve of the safety valve of the present invention is significantly improved, thereby avoiding sealing failure of the two; 7. The safety valve of the present invention is provided with a check assembly to prevent the medium from flowing back. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0017] Figure 1For the purpose of illustrating the present invention Figure 1 ; Figure 2 For the purpose of illustrating the present invention Figure 2 ; Figure 3 for Figure 2 A magnified view of middle; Figure 4 for Figure 2 Enlarged view of middle B; Figure 5 for Figure 2 Enlarged view of middle C; Figure 6 is a schematic diagram of the valve body and cleaning assembly of the present invention; Figure 7 for Figure 6 Enlarged view of middle D; Figure 8 is a schematic diagram of the second valve core and the first sealing member of the present invention; Fig. 9 for Figure 8 Enlarged view of E in the middle; Fig.10 for Figure 8 Enlarged view of middle F; Fig.11 is a schematic diagram of a check assembly of the present invention; Fig.12 is a schematic diagram of a mounting plate of the present invention; Fig.13 Schematic diagram of the pilot valve assembly of the present invention. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0019] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0020] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are for explaining and understanding the present invention, but not for limiting the scope of protection of the present invention.

[0021] like Figures 1 to 13 As shown, an embodiment of the present invention is provided: A double-row low-temperature safety valve comprises a main valve body 1, a valve cover 2, a pilot valve assembly 3, a first valve core 14 and a spring 5, wherein the valve cover 2 is arranged on the upper end surface of the main valve body 1, one end of the spring 5 is connected to the first valve core 14 and the other end is connected to the valve cover 2, an inlet flow channel 11 and an outlet flow channel are arranged in the main valve body 1, the outlet flow channel comprises a first outlet flow channel 121 and a second outlet flow channel 122 respectively located on both sides of the inlet flow channel 11, two outlet flow channels are arranged, thereby increasing the discharge flow rate of the safety valve. A guide sleeve 13 is provided in the main valve body 1, the first valve core 14 is slidably provided in the guide sleeve 13, and a valve seat 15 is provided in the main valve body 1 between the first outlet flow channel 121 and the second outlet flow channel 122, a first installation groove is provided at one end of the first valve core 14 close to the inlet flow channel 11, a first sealing member 141 is provided in the first installation groove, and the first sealing member 141 and the valve seat 15 form a first sealing surface, a medium accommodating chamber 16 is formed in the guide sleeve 13 between the first valve core 14 and the valve cover 2, a first drainage pipe 6 is provided between the inlet flow channel 11 and the pilot valve assembly 3, and the valve cover A second drainage pipe 7 is arranged between the pilot valve assembly 2 and the pilot valve assembly 3, so that the pilot valve assembly 3 is connected with the medium accommodating chamber 16 and the inlet flow channel 11, and the first sealing member 141 and the valve seat 15 can both be elastically deformed. When the valve seat 15 and the first sealing member 141 are sealed and matched, the medium accommodating chamber 16 is filled with the medium to form a pressure on the first valve core 14 in the direction of the valve seat 15, so that the first sealing member 141 squeezes the valve seat 15, and the area of ​​the first sealing surface is increased, which can significantly improve the sealing performance between the first valve core 14 and the valve seat 15, and avoid the difficulty in controlling the sealing matching gap between the first valve core 14 and the valve seat 15 under low temperature conditions. Specifically, the diameter of the first sealing member 141 gradually increases along the direction close to the inlet flow channel 11, and the diameter of the valve seat 15 gradually decreases along the direction away from the inlet flow channel 11. A filter 8 is arranged on the first drainage pipe 6, and the filter 8 contains a throttling member.

[0022] The main valve body 1 is provided with a first groove 17 behind the valve seat 15, and the main valve body 1 is provided with a convex block 18 in the direction of the first groove 17. The valve seat 15, the first groove 17 and the convex block 18 form a bend connecting the inlet flow channel 11 and the outlet flow channel. When the medium flows from the inlet flow channel 11 to the bend, due to the change in the flow channel direction, centrifugal force and other factors will be generated to reduce the fluid velocity, which helps to reduce the impact of the fluid on the valve body or subsequent pipelines; and for liquid media, the bend changes the pressure distribution of the liquid, which can significantly reduce the occurrence of cavitation.

[0023] The lower end of the first sealing member 141 extends toward the outlet flow channel to form a sealing protrusion 1411, and the sealing protrusion 1411 is located in the first groove 17. The medium containing cavity 16 is filled with the medium to form a pressure on the first valve core 14 toward the valve seat 15, so that when the first sealing member 141 abuts against the first groove 17, the sealing protrusion 1411 and the first groove 17 form a second sealing surface, and the area of ​​the first sealing surface is the largest at this time. The first sealing surface and the second sealing surface form a double sealing guarantee, reducing the risk of sealing failure between the first valve core 14 and the valve seat 15.

[0024] In order to facilitate the assembly of the first seal 141 and the first valve core 14, and after the first seal 141 is damaged, only the first seal 141 can be replaced to save replacement costs, a first mounting ring 146 is provided between the first seal 141 and the first valve core 14, and a fourth mounting groove matching the first mounting ring 146 is provided on the outer periphery of the first seal 141, the first mounting ring 146 is provided in the fourth mounting groove, and the first mounting ring 146 abuts against the first valve core 14 at one end away from the first seal 141. Specifically, the fourth mounting groove is provided with a third groove at one end close to the valve seat 15, and the fourth mounting groove is provided with a fourth groove at one end away from the valve seat 15, and the first limiting protrusion 1461 and the second limiting protrusion 1462 are provided at both ends of the first mounting ring 146, respectively, and the third groove is interference-fitted with the first limiting protrusion 1461, and the fourth groove is interference-fitted with the second limiting protrusion 1462.

[0025] Since both the first sealing member 141 and the valve seat 15 are elastically deformable, one end of the first sealing member 141 is supported by the first valve core 14, while the valve seat 15 has no component that can provide support, which easily causes the valve seat 15 to deform excessively, thereby reducing the service life of the valve seat 15. For this reason, a second valve core 9 is provided at the lower end of the first valve core 14, and the second valve core 9 includes a connecting rod 91 and a non-deformable support block 92, one end of the connecting rod 91 is connected to the first valve core 14 and the other end is connected to the support block 92, the support block 92 is located in the inlet flow channel 11, and the outer wall of the support block 92 abuts against the valve seat 15 to form a fourth sealing surface, which provides support while also increasing the sealing surface, and the first sealing surface and the fourth sealing surface provide double protection for the sealing at the valve seat 15. More importantly, the first valve core 14 and the second valve core 9 form radial extrusion, so that the first seal 141 is radially tightened, and the medium containing chamber 16 is filled with medium to exert pressure on the first valve core 14 toward the valve seat 15, so that the first seal 141 squeezes the valve seat 15. The two cooperate with each other to greatly improve the sealing performance.

[0026] Specifically, the cross-sectional shape of the support block 92 away from the first valve core 14 is adapted to the shape of the valve seat 15 , and the diameter of the support block 92 close to the first valve core 14 gradually decreases, and the support block 92 close to the first valve core 14 forms a guide groove 93 with the inner wall of the first valve core 14 .

[0027] In order to further improve the service life of the valve seat 15 and prevent impurities from remaining on the surface of the valve seat 15, which causes the valve seat 15 to be worn when the support block 92 abuts against the valve seat 15, the safety valve also includes a cleaning assembly 30, which includes a second mounting ring 301 and a connecting column 302. The outer periphery of the second mounting ring 301 is provided with a plurality of convex rings 3011 distributed along the axial direction, and the convex rings 3011 abut against the valve seat 15. The connecting column 302 is connected to the support block 92, so that the connecting column 302 and the support block 92 move synchronously. Specifically, a plurality of support plates 303 are circumferentially provided between the second mounting ring 301 and the connecting column 302, and a connecting groove is formed between adjacent support plates 303, and the connecting groove is communicated with the inlet flow channel 11.

[0028] The first valve core 14 slides in the guide sleeve 13, and the sealing between the two is also very important. If the sealing between the two fails, the medium will flow between the medium accommodating chamber 16 and the inlet flow channel 11, and then the pressure of the medium in the medium accommodating chamber 16 on the first valve core 14 toward the valve seat 15 will be greatly reduced, and even the clamping force cannot be formed, which will eventually affect the sealing between the first valve core 14 and the valve seat 15. In order to ensure the sealing between the first valve core 14 and the guide sleeve 13, sealing members are respectively provided at the upper and lower ends of the first valve core 14. Specifically, a second mounting groove 142 is provided on the side of the first valve core 14 away from the inlet flow channel 11, and a second sealing member 143 is provided in the second mounting groove 142, and the second sealing member 143 is sealed with the guide sleeve 13. Specifically, the second sealing member 143 includes a first mounting portion 1431 and a first sealing portion 1432. The first mounting portion 1431 is connected to the first valve core 14. The first sealing portion 1432 is used to seal the guide sleeve 13 and the first valve core 14. The first mounting portion 1431 and the first sealing portion 1432 are in an inverted V shape. A first annular flow channel 19 is provided between the first valve core 14 and the guide sleeve 13. The medium accommodating chamber 16, the first annular flow channel 19 and the second mounting groove 142 are in communication. The medium flows to the second mounting groove 142 through the medium accommodating chamber 16 and the first annular flow channel 19, so that the first sealing portion 1432 is pressed against the first valve core 14 and the guide sleeve 13, thereby improving the sealing performance. The first valve core 14 is provided with a third mounting groove 144 on the side close to the inlet flow channel 11. A third sealing member 145 is provided in the third mounting groove 144. The third sealing member 145 is in sealing cooperation with the guide sleeve 13. Specifically, the third sealing member 145 includes a second mounting portion 1451 and a second sealing portion 1452, wherein the second mounting portion 1451 is connected to the first valve core 14, and the second sealing portion 1452 is used to seal the guide sleeve 13 and the first valve core 14, and the second mounting portion 1451 and the second sealing portion 1452 are V-shaped, and a second annular flow channel 20 is provided between the first valve core 14 and the guide sleeve 13, and the inlet flow channel 11, the second annular flow channel 20 and the third mounting groove 144 are in communication. The medium flows into the third mounting groove 144 through the inlet flow channel 11 and the second annular flow channel 20, so that the second sealing portion 1452 is pressed against the first valve core 14 and the guide sleeve 13, thereby improving the sealing performance.

[0029] In order to avoid medium backflow, the first outlet flow channel 121 and the second outlet flow channel 122 are both provided with a check assembly 4, and the check assembly 4 includes a mounting plate 41 and a check column 42. The outer wall of the mounting plate 41 is completely abutted against the main valve body 1, and a first through hole 411 is provided in the middle of the mounting plate 41. The check column 42 is slidably arranged in the first through hole 411, and the end of the check column 42 away from the first valve core 14 abuts against the mounting plate 41 to form a third sealing surface 43. A plurality of second through holes are circumferentially provided at one end 42 of the check column, and the second through holes are communicated with the inlet flow channel 11, so that the check assembly 4 has an open state in which the outlet flow channel is connected to the inlet flow channel 11, and a check state in which the outlet flow channel is not connected to the inlet flow channel 11.

[0030] Specifically, the mounting plate 41 is circumferentially provided with a second groove 412 on the outer side of the first through hole 411, the check column 42 includes a sliding portion 421 and an abutting portion 422, the second through hole is provided on the circumferential side wall of the sliding portion 421, the abutting portion 422 abuts against the second groove 412, and in the check state, the abutting portion 422 separates the outlet flow channel and the inlet flow channel 11.

[0031] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A double-row cryogenic safety valve, comprising a main valve body (1), a valve cover (2) and a pilot valve assembly (3), wherein the valve cover (2) is arranged on the upper end surface of the main valve body (1), an inlet flow channel (11) and an outlet flow channel are arranged in the main valve body (1), the outlet flow channel comprises a first outlet flow channel (121) and a second outlet flow channel (122) respectively located on both sides of the inlet flow channel (11), a guide sleeve (13) is arranged in the main valve body (1), a first valve core (14) is slidably arranged in the guide sleeve (13), and a valve seat (15) is arranged in the main valve body (1) between the first outlet flow channel (121) and the second outlet flow channel (122), characterized in that: A first mounting groove is provided at one end of the first valve core (14) close to the inlet flow channel (11), a first sealing member (141) is provided in the first mounting groove, and the first sealing member (141) and the valve seat (15) form a first sealing surface, a medium accommodating chamber (16) is formed between the first valve core (14) and the valve cover (2) in the guide sleeve (13), the pilot valve assembly (3) is in communication with the medium accommodating chamber (16) and the inlet flow channel (11), and the first sealing member (141) and the valve seat (15) are both elastically deformable, and when the valve seat (15) and the first sealing member (141) are in sealing cooperation, the medium accommodating chamber (16) is filled with medium, which exerts pressure on the first valve core (14) in a direction toward the valve seat (15), causing the first sealing member (141) to squeeze the valve seat (15), thereby increasing the area of ​​the first sealing surface.

2. A double row cryogenic safety valve according to claim 1, characterized in that: The diameter of the first sealing member (141) gradually increases in a direction approaching the inlet flow channel (11), and the diameter of the valve seat (15) gradually decreases in a direction away from the inlet flow channel (11).

3. A double row cryogenic safety valve according to claim 2, characterized in that: The main valve body (1) is provided with a first groove (17) behind the valve seat (15), and the main valve body (1) is provided with a protrusion (18) facing the first groove (17); the valve seat (15), the first groove (17) and the protrusion (18) form a bend connecting the inlet flow channel (11) and the outlet flow channel.

4. A double row cryogenic safety valve according to claim 3, characterized in that: The lower end of the first sealing member (141) extends toward the outlet flow channel to form a sealing protrusion (1411), and the sealing protrusion (1411) is located in the first groove (17). When the medium accommodating chamber (16) is filled with medium, pressure is exerted on the first valve core (14) in a direction toward the valve seat (15), so that when the first sealing member (141) abuts against the first groove (17), the sealing protrusion (1411) and the first groove (17) form a second sealing surface, and at this time, the area of ​​the first sealing surface is the largest.

5. A double row cryogenic safety valve according to claim 4, characterized in that: A first mounting ring (146) is provided between the first sealing member (141) and the first valve core (14); a fourth mounting groove matched with the first mounting ring (146) is provided on the outer periphery of the first sealing member (141); the first mounting ring (146) is arranged in the fourth mounting groove; and an end of the first mounting ring (146) away from the first sealing member (141) abuts against the first valve core (14).

6. A double row cryogenic safety valve according to claim 5, characterized in that: A third groove is provided at one end of the fourth mounting groove close to the valve seat (15), and a fourth groove is provided at one end of the fourth mounting groove away from the valve seat (15). A first limiting protrusion (1461) and a second limiting protrusion (1462) are provided at both ends of the first mounting ring (146), respectively. The third groove is interference fit with a limiting protrusion (1461), and the fourth groove is interference fit with the second limiting protrusion (1462).

7. A double row cryogenic safety valve according to claim 1, characterized in that: A second valve core (9) is provided at the lower end of the first valve core (14), and the second valve core (9) comprises a connecting rod (91) and a non-deformable support block (92), one end of the connecting rod (91) is connected to the first valve core (14) and the other end is connected to the support block (92), the support block (92) is located in the inlet flow channel (11), and the outer wall of the support block (92) abuts against the valve seat (15) to form a fourth sealing surface.

8. A double row cryogenic safety valve according to claim 7, characterized in that: The cross-sectional shape of the support block (92) away from the first valve core (14) is adapted to the shape of the valve seat (15), and the diameter of the support block (92) at one end close to the first valve core (14) gradually decreases, and the end of the support block (92) close to the first valve core (14) forms a guide groove (93) with the inner wall of the first valve core (14).

9. A double row cryogenic safety valve according to claim 8, characterized in that: The cleaning assembly (30) further comprises a cleaning assembly (30), the cleaning assembly (30) comprising a second mounting ring (301) and a connecting column (302), the outer periphery of the second mounting ring (301) being provided with a plurality of convex rings (3011) distributed along the axial direction, the convex rings (3011) being in contact with the valve seat (15), and the connecting column (302) being connected to the supporting block (92), so that the connecting column (302) and the supporting block (92) move synchronously.

10. A double row cryogenic safety valve according to claim 9, characterized in that: A plurality of support plates (303) are arranged between the second mounting ring (301) and the connecting column (302) along the circumferential direction, and connecting grooves are formed between adjacent support plates (303), wherein the connecting grooves are in communication with the inlet flow channel (11).

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