Anti-freezing petrochemical engineering valve

Abstract

The invention relates to the technical field of instrument valves, in particular to an anti-freezing petrochemical engineering valve. Connecting flanges are connected to the two ends of the valve body, closed rings are fixed to the two ends in the valve body, guide grooves are formed in the top ends and the bottom ends of the two ends in the valve body, conical pistons are slidably connected to the inner sides of the guide grooves, and the ends, away from each other, of the two conical pistons are slidably connected with the closed rings; a closing mechanism used for driving the conical piston and the closed ring to be separated or sealed is arranged on the inner side of the valve body. According to the anti-freezing petrochemical engineering valve, the closing mechanism is started to drive the conical piston to be in separation and sealing contact with the closed ring in the direction away from or close to each other, then petroleum in the valve body is effectively isolated or circulated, and the isolation and sealing effects of the petroleum are effectively improved through the arrangement of the conical piston and the closed ring; and through the arrangement of the two closed rings and the conical piston, the petroleum leakage condition is effectively prevented, and the practicability of the device is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument valves, in particular to an antifreeze petrochemical valve. Background Art

[0002] Petrochemicals, short for petrochemical industry, generally refers to the chemical industry system that uses petroleum and natural gas as raw materials. As a core component of the chemical industry, it encompasses a broad range of industries and produces a rich variety of products. It plays a key role in national economic development and is one of my country's key pillar industries. Petrochemical pipelines are primarily used to transport corrosive media such as petroleum and chemical raw materials. Pipeline valves are often installed at branch nodes in these pipelines to effectively control the flow and shutoff of the media within the pipeline.

[0003] For example, patent (CN 219317889 U) discloses a chemical instrument valve that is easy to connect, including an instrument valve body, a first connecting flange is respectively provided on both sides of the lower end of the instrument valve body, connecting pipes are provided on both sides of the instrument valve body, a second connecting flange is provided on the connecting pipe, an annular fixing groove is provided on the first connecting flange, a sealing gasket is provided in the fixing groove, and a limiting structure is also provided on the first connecting flange. The limiting structure includes an L-shaped fixing plate, one end of the fixing plate is against the nut, and a fixing rod is also provided on the fixing plate. A positioning groove is provided on the first connecting flange, and a bolt passes through the positioning groove. A through groove is provided on the bolt, and the fixing rod extends into the positioning groove and passes through the through groove. The utility model arranges a limiting structure to limit the bolts and nuts, reduces the possibility of loosening between the bolts and nuts, and thus ensures the sealing effect. Overall, while increasing the sealing effect, it also ensures the convenience of connecting the instrument valve.

[0004] When using the above technology, it was found that the following technical problems exist in the existing technology: the oil pipeline valves of the existing technology need to be replaced after being damaged during long-term use, so the connecting flanges are bolted to the oil pipeline. When the pipeline valve needs to be replaced, the pipeline valve and the connecting flanges at both ends are effectively disassembled, so as to effectively replace the pipeline valve and effectively ensure the sealing and stability between the pipeline valve and the connecting flanges. In addition, the existing technology usually uses sealing plates to isolate oil from pipeline valves. Due to long-term use of the valves, gaps will appear between the various structures of the control valves, causing oil leakage. For this reason, we design an antifreeze petrochemical valve to provide another technical solution to the above technical problems. Summary of the Invention

[0005] Based on this, it is necessary to provide an antifreeze petrochemical valve to address the above technical problems. The valve body is threadedly connected to the connecting flange, and the connecting flange is bolted to the external oil pipe. At this time, the valve body, connecting flange and external oil pipe are effectively assembled. At this time, the valve body, connecting flange and oil pipe are effectively disassembled later, and the valve body and connecting flange are replaced and repaired. When the valve body, connecting flange and external oil pipe are passed with oil, the closing mechanism is started to drive the conical piston to disengage and seal with the closed loop in the direction away from or close to each other, thereby effectively isolating or circulating the oil inside the valve body. The setting of the conical piston and the closed loop effectively improves the isolation and sealing effect of the oil, and the setting of the two closed loops and the conical piston effectively prevents oil leakage, thereby promoting the practicality of the device.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An antifreeze petrochemical valve includes a valve body, both ends of the valve body are connected to connecting flanges, both ends of the valve body are fixed with closed rings, the top and bottom ends of the valve body are provided with guide grooves, the inner sides of the guide grooves are slidably connected to tapered pistons, the ends of the two tapered pistons that are away from each other are slidably connected to the closed ring, and the inner side of the valve body is provided with a closing mechanism for driving the tapered pistons to separate or seal from the closed ring.

[0008] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, the closing mechanism includes a rotating ring, a transmission rod, a transmission plate and a linkage arm. The middle part of the valve body is rotatably connected to the transmission rod, and a sealing partition is fixed to the top of the inner side of the valve body. The top of the transmission rod passes through the sealing partition and the valve body and is fixed with a rotating ring. The bottom end of the transmission rod is fixed with a transmission plate, and both ends of the bottom end of the transmission plate are rotatably connected to the linkage arm, and the end of the linkage arm away from the transmission plate is rotatably connected to the conical piston.

[0009] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, the connection between the transmission plate and the linkage arm deviates from the center position of the transmission plate.

[0010] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, the top end of the valve body is provided with an anti-seepage mechanism for sealing between the sealing partition and the transmission rod, the anti-seepage mechanism includes a spring and a sealing plate, a spring is sleeved on the outside of the transmission rod and above the sealing partition, the top end of the sealing partition is slidably connected to the sealing plate, the inner side of the sealing plate is slidably connected to the transmission rod, the top end of the spring is fixed to the valve body, and the bottom end of the spring is fixed to the sealing plate.

[0011] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, a sealing mechanism is arranged between the valve body and the connecting flange, and the sealing mechanism includes a spiral pattern, a handle, a resisting spring, a resisting ring and a reinforcement component. A connecting groove is opened inside the connecting flange, and spiral patterns are fixed at both ends of the outer side of the valve body, and the outer side of the spiral pattern is threadedly connected to the connecting flange.

[0012] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, a resistance spring is fixed at one end of the inner side of the connecting groove, a resistance ring is fixed at the end of the resistance spring away from the connecting groove, and the outer side of the resistance ring is slidably connected to the connecting flange.

[0013] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, a sealing gasket is fixed to one end of the resisting ring close to the valve body.

[0014] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, a plurality of handles are fixed to the outer side of the connecting flange.

[0015] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, the reinforcement assembly includes a limit ring, a connecting ring, a fixed ring and a linkage rod. The limit rings are fixed at both ends of the outer side of the valve body, and the ends of the two limit rings close to each other are rotatably connected to the connecting rings. The outer side of the connecting flange is fixed with a fixed ring, and both sides of the fixed ring are rotatably connected to the linkage rods. The end of the linkage rod away from the connecting flange is slidably connected to the connecting ring.

[0016] As a preferred embodiment of the antifreeze petrochemical valve provided by the present invention, T-shaped limit grooves are provided on both sides of the interior of the connecting ring, and the inner sides of the T-shaped limit grooves are slidably connected to the linkage rod.

[0017] It can be seen without a doubt that the above-mentioned technical solution of this application can definitely solve the technical problem to be solved by this application.

[0018] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0019] The present invention provides an antifreeze petrochemical valve. The rotating ring drives the transmission rod to rotate synchronously. The transmission rod drives the transmission plate at the bottom to rotate. Because the connection point between the linkage arm and the transmission plate is offset from the center of the circle, the rotational motion is converted into radial thrust of the linkage arm. The linkage arm pushes the two tapered pistons to move along the guide groove toward the two ends of the valve body until the tapered inclined surfaces are tightly pressed into a closed loop. The tapered pistons on both sides operate independently. Even if the seal on one side fails, the seal on the other side can still be maintained. As a result, the oil is completely blocked at both ends of the valve body, achieving zero leakage.

[0020] The spring of the anti-seepage mechanism continuously compresses the PTFE sealing plate, automatically compensating for wear and thermal deformation to ensure long-term sealing reliability. The sealing plate is made of PTFE material, and the tapered piston is combined with low-temperature grease to ensure normal operation in an environment of -50°C.

[0021] A hard stop is formed by the linkage rod and the T-shaped limit groove to prevent the flange from reversing and loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure between the connecting flange and the valve body of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the valve body and connecting flange of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure between the connecting groove and the valve body of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure between the closed loop and the tapered piston of the present invention;

[0028] Figure 6 Schematic diagram of the anti-seepage mechanism structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure between the rotating ring and the transmission plate of the present invention;

[0030] Figure 8 This is a schematic structural diagram of the sealing mechanism of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the resisting spring and resisting ring of the present invention;

[0032] Figure 10 This is a structural schematic diagram of the reinforcement component of the present invention.

[0033] In the figure: 1. Valve body; 2. Connecting flange; 3. Connecting ring; 4. Fixed ring; 5. Handle; 6. Rotating ring; 7. Sealing partition; 8. Spring; 9. Sealing plate; 10. Transmission rod; 11. Transmission plate; 12. Linkage arm; 13. Closed ring; 14. Conical piston; 15. Guide groove; 16. Limiting ring; 17. Connecting groove; 18. Spiral pattern; 19. Resistance spring; 20. Resistance ring; 21. T-type limit groove; 22. Linkage rod. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] Example 1

[0039] Please refer to Figure 1-Figure 7 , an antifreeze petrochemical valve, including a valve body 1, both ends of the valve body 1 are connected with connecting flanges 2, both ends of the valve body 1 are fixed with closed rings 13, the top and bottom ends of the valve body 1 are provided with guide grooves 15, the inner side of the guide groove 15 is slidably connected with a tapered piston 14, the inclined surface design of the tapered piston 14 reduces the friction resistance of the sealing contact surface. The guide groove 15 ensures the linear movement of the tapered piston 14 to avoid poor sealing caused by deflection. The ends of the two tapered pistons 14 away from each other are slidably connected with the closed ring 13, and a closing mechanism for driving the tapered piston 14 to disengage or seal with the closed ring 13 is provided on the inner side of the valve body 1. The inclined surface design of the tapered piston 14 reduces the friction resistance of the sealing contact surface. The two tapered pistons 14 and the closed ring 13 form a double sealing barrier, which can prevent leakage even if the seal on one side fails;

[0040] When in use, when the valve body 1 is threadedly connected to the connecting flange 2, the connecting flange 2 is bolted to the external oil pipe, and the valve body 1, the connecting flange 2 and the external oil pipe are effectively assembled. At this time, the valve body 1, the connecting flange 2 and the oil pipe are effectively disassembled at a later time, and the valve body 1 and the connecting flange 2 are replaced and repaired. When the valve body 1, the connecting flange 2 and the external oil pipe are passed with oil, the closing mechanism is started at this time to drive the tapered piston 14 to move away from or approach each other to disengage and seal with the closed ring 13, thereby effectively isolating or circulating the oil inside the valve body 1. The setting of the tapered piston 14 and the closed ring 13 effectively improves the isolation and sealing effect of the oil, and the setting of the two closed rings 13 and the tapered piston 14 effectively prevents oil leakage, thereby promoting the practicality of the device;

[0041] The closing mechanism includes a rotating ring 6, a transmission rod 10, a transmission plate 11 and a linkage arm 12. The transmission rod 10 is rotatably connected to the middle of the valve body 1. A sealing partition 7 is fixed to the top of the inner side of the valve body 1. The top of the transmission rod 10 passes through the sealing partition 7 and the valve body 1 to fix the rotating ring 6. The bottom end of the transmission rod 10 is fixed to a transmission plate 11. Both ends of the bottom end of the transmission plate 11 are rotatably connected to the linkage arm 12. The end of the linkage arm 12 away from the transmission plate 11 is rotatably connected to the tapered piston 14. The connection point between the transmission plate 11 and the linkage arm 12 deviates from the center of the circle of the transmission plate 11. The connection point between the transmission plate 11 and the linkage arm 12 deviates from the center of the circle, thereby increasing the torque conversion efficiency.

[0042] The rotating ring 6 rotates clockwise, and the transmission plate 11 pushes the linkage arm 12, causing the conical piston 14 to press against the closed ring 13 to form a seal. The rotating ring 6 rotates in the opposite direction, and the conical piston 14 is separated from the closed ring 13, allowing the oil to circulate.

[0043] Specifically, by rotating the rotating ring 6, the transmission rod 10 is driven to rotate, and the transmission rod 10 drives the transmission plate 11 to rotate, and the transmission plate 11 drives the linkage arm 12 and the tapered piston 14 to move along the guide groove 15, so that the two tapered pistons 14 are sealed and separated from each other in the direction of moving away from or approaching each other, and the closed ring 13 and the tapered piston 14 are sealed, effectively isolating the oil inside the valve body 1, and the closed ring 13 and the tapered piston 14 are separated, effectively allowing the oil inside the valve body 1 to circulate, so as to effectively control the oil flow rate;

[0044] The top of the valve body 1 is provided with an anti-seepage mechanism for sealing between the sealing diaphragm 7 and the transmission rod 10. The anti-seepage mechanism includes a spring 8 and a sealing plate 9. The spring 8 is sleeved on the outside of the transmission rod 10 and above the sealing diaphragm 7. The top of the sealing diaphragm 7 is slidably connected to the sealing plate 9. The inner side of the sealing plate 9 is slidably connected to the transmission rod 10. The top of the spring 8 is fixed to the valve body 1, and the bottom of the spring 8 is fixed to the sealing plate 9. The spring 8 continuously presses the sealing plate 9 to fit the sealing diaphragm 7. Even if the transmission rod 10 rotates or wears, the seal is still maintained. The sealing plate 9 is made of polytetrafluoroethylene (PTFE) and is still elastic at -50°C.

[0045] Furthermore, the transmission rod 10 is driven to rotate by the rotating ring 6, and the transmission rod 10 is in contact with the sealing partition 7 and the valve body 1. Over time, oil will penetrate from the connection between the transmission rod 10 and the sealing partition 7. At this time, the elasticity of the spring 8 drives the sealing plate 9 to apply pressure to the sealing partition 7, and the sealing plate 9 effectively reduces the probability of penetration and effectively prevents oil penetration.

[0046] Example 2

[0047] Please refer to Figure 7-10 , an antifreeze petrochemical valve, a sealing mechanism is provided between the valve body 1 and the connecting flange 2, the sealing mechanism includes a spiral pattern 18, a handle 5, a resistance spring 19, a resistance ring 20 and a reinforcement component, a plurality of handles 5 are fixed to the outside of the connecting flange 2, a connecting groove 17 is provided inside the connecting flange 2, spiral patterns 18 are fixed at both ends of the outside of the valve body 1, the valve body 1 and the connecting flange 2 are quickly assembled by threads, replacing traditional bolts, the outer side of the spiral pattern 18 is threadedly connected to the connecting flange 2, one end of the inner side of the connecting groove 17 is fixed with a resistance spring 19, and the end of the resistance spring 19 away from the connecting groove 17 is fixed with a resistance ring 20, the outer side of the resistance ring 20 is slidably connected to the connecting flange 2, and the resistance spring 19 pushes the resistance ring 20 to press the valve body 1 to compensate for the thread gap;

[0048] Specifically, the valve body 1 is threadedly connected to the connecting flange 2, and the handle 5 is held to drive the connecting flange 2 to connect with the valve body 1. At this time, the valve body 1 is connected to the connecting groove 17, and the elasticity of the resisting spring 19 drives the resisting ring 20 and the sealing gasket to resist the valve body 1, thereby effectively preventing oil leakage from the valve body 1 and the connecting flange 2.

[0049] A sealing gasket is fixed to one end of the resisting ring 20 close to the valve body 1, and the sealing gasket improves the sealing effect between the valve body 1 and the connecting flange 2;

[0050] The reinforcement assembly includes a limit ring 16, a connecting ring 3, a fixed ring 4 and a linkage rod 22. The limit rings 16 are fixed at both ends of the outer side of the valve body 1. The ends of the two limit rings 16 close to each other are rotatably connected to the connecting ring 3. The fixing ring 4 is fixed to the outer side of the connecting flange 2. Both sides of the fixing ring 4 are rotatably connected to the linkage rod 22. The end of the linkage rod 22 away from the connecting flange 2 is slidably connected to the connecting ring 3. T-shaped limit grooves 21 are opened on both sides of the interior of the connecting ring 3. The inner side of the T-shaped limit groove 21 is slidably connected to the linkage rod 22.

[0051] Furthermore, the handle 5 is held to drive the connecting flange 2 to be threadedly connected to the valve body 1, and the connecting flange 2 is sealed with the valve body 1 by the bottom resistance spring 19 and the resistance ring 20. At this time, the elasticity of the resistance spring 19 drives the resistance ring 20 to resist the valve body 1, greatly improving the sealing effect between the valve body 1 and the connecting flange 2.

[0052] When the connecting flange 2 rotates, the linkage rod 22 slides along the T-shaped limit groove 21, and the flange displacement is limited by the connecting ring 3 to prevent loosening.

[0053] The use process of an antifreeze petrochemical valve provided by the present invention is as follows: the spiral patterns 18 at both ends of the valve body 1 are screwed into the internal threads of the connecting flange 2, and the connecting flange 2 is bolted to the external oil pipe. The handle 5 is manually tightened, and the resisting spring 19 pushes the resisting ring 20 to press the end face of the valve body 1 to compensate for the processing tolerance and thermal expansion and contraction gap. When the connecting flange 2 rotates, the linkage rod 22 on the fixing ring 4 slides along the T-shaped limit groove 21 of the connecting ring 3. When the flange is tightened into place, the linkage rod 22 is snapped into the end of the T-shaped groove to form a mechanical lock to prevent reverse loosening. Therefore, the device is effectively assembled, and the valve body 1, the connecting flange 2 and the external oil pipe are effectively disassembled, which is convenient for repairing and replacing parts in the device.

[0054] Rotate the rotating ring 6 clockwise to drive the transmission rod 10 to rotate synchronously. The transmission rod 10 drives the transmission plate 11 at the bottom to rotate. Since the connection point between the linkage arm 12 and the transmission plate 11 deviates from the center of the circle, the rotational motion is converted into radial thrust of the linkage arm 12. The linkage arm 12 pushes the two tapered pistons 14 along the guide groove 15 toward the two ends of the valve body 1 until the tapered inclined surface tightly presses the closed ring 13. The tapered pistons 14 on both sides act independently. Even if the seal on one side fails, the seal on the other side can still be maintained. As a result, the oil is completely blocked at both ends of the valve body 1, achieving zero leakage.

[0055] When the rotating ring 6 is rotated counterclockwise, the transmission rod 10 rotates in the opposite direction, and the transmission plate 11 pulls the tapered piston 14 toward the center of the valve body 1 through the linkage arm 12, disengaging from the closed loop 13, thereby circulating the oil, and the rotation angle effectively adjusts the circulation speed.

[0056] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An antifreeze petrochemical valve, characterized in that: The invention comprises a valve body (1), both ends of the valve body (1) are connected with connecting flanges (2), both ends of the interior of the valve body (1) are fixed with closed rings (13), the top and bottom ends of both ends of the interior of the valve body (1) are provided with guide grooves (15), the inner side of the guide groove (15) is slidably connected with a conical piston (14), the ends of the two conical pistons (14) that are away from each other are slidably connected with the closed ring (13), and the inner side of the valve body (1) is provided with a closing mechanism for driving the conical piston (14) to separate or seal from the closed ring (13).

2. The antifreeze petrochemical valve according to claim 1, characterized in that: The closing mechanism comprises a rotating ring (6), a transmission rod (10), a transmission plate (11) and a linkage arm (12); the transmission rod (10) is rotatably connected to the middle of the valve body (1); a sealing partition (7) is fixed to the top of the inner side of the valve body (1); the top of the transmission rod (10) passes through the sealing partition (7) and the valve body (1) and is fixed with the rotating ring (6); the bottom end of the transmission rod (10) is fixed with a transmission plate (11); both ends of the bottom end of the transmission plate (11) are rotatably connected to the linkage arm (12); and the end of the linkage arm (12) away from the transmission plate (11) is rotatably connected to the conical piston (14).

3. The antifreeze petrochemical valve according to claim 2, characterized in that: The connection point between the transmission plate (11) and the linkage arm (12) deviates from the center position of the transmission plate (11).

4. The antifreeze petrochemical valve according to claim 3, characterized in that: The top end of the valve body (1) is provided with an anti-seepage mechanism for sealing between the sealing partition (7) and the transmission rod (10), and the anti-seepage mechanism includes a spring (8) and a sealing plate (9). The spring (8) is sleeved on the outside of the transmission rod (10) and located above the sealing partition (7). The top end of the sealing partition (7) is slidably connected to the sealing plate (9), and the inner side of the sealing plate (9) is slidably connected to the transmission rod (10). The top end of the spring (8) is fixed to the valve body (1), and the bottom end of the spring (8) is fixed to the sealing plate (9).

5. The antifreeze petrochemical valve according to claim 2, characterized in that: A sealing mechanism is provided between the valve body (1) and the connecting flange (2), and the sealing mechanism includes a spiral pattern (18), a handle (5), a resistance spring (19), a resistance ring (20) and a reinforcement component. A connecting groove (17) is provided inside the connecting flange (2), and spiral patterns (18) are fixed at both ends of the outer side of the valve body (1), and the outer side of the spiral pattern (18) is threadedly connected to the connecting flange (2).

6. The antifreeze petrochemical valve according to claim 5, characterized in that: A resisting spring (19) is fixed to one end of the inner side of the connecting groove (17), and a resisting ring (20) is fixed to one end of the resisting spring (19) away from the connecting groove (17). The outer side of the resisting ring (20) is slidably connected to the connecting flange (2).

7. The antifreeze petrochemical valve according to claim 5, characterized in that: A sealing gasket is fixed to one end of the resisting ring (20) close to the valve body (1).

8. The antifreeze petrochemical valve according to claim 6, characterized in that: A plurality of handles (5) are fixed on the outer side of the connecting flange (2).

9. The antifreeze petrochemical valve according to claim 5, characterized in that: The reinforcement assembly comprises a limiting ring (16), a connecting ring (3), a fixing ring (4) and a linkage rod (22); limiting rings (16) are fixed at both ends of the outer side of the valve body (1); the ends of the two limiting rings (16) close to each other are rotatably connected to the connecting ring (3); a fixing ring (4) is fixed on the outer side of the connecting flange (2); both sides of the fixing ring (4) are rotatably connected to the linkage rod (22); the end of the linkage rod (22) away from the connecting flange (2) is slidably connected to the connecting ring (3).

10. The antifreeze petrochemical valve according to claim 9, characterized in that: T-shaped limiting grooves (21) are provided on both sides of the interior of the connecting ring (3), and the inner sides of the T-shaped limiting grooves (21) are slidably connected to the linkage rod (22).

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