A hard-sealed ball valve with low-temperature protection function

Abstract

The present invention discloses a hard-sealed ball valve with a low-temperature protection function, comprising: a first connecting pipe of the ball valve, a second connecting pipe of the ball valve arranged outside the first connecting pipe of the ball valve, and a ball valve bead installed inside the first connecting pipe of the ball valve. It further includes: a first connecting outer ring, the outer end of the first connecting pipe of the ball valve is welded and fixed with the first connecting outer ring, and the outer end of the first connecting outer ring is fitted with a second connecting outer ring. This hard-sealed ball valve with a low-temperature protection function solves the problems that the existing hard-sealed ball valve cannot effectively connect and buffer internal parts, is not convenient for better long-term use of internal parts, the ball valve is prone to damage when winter comes during the use of the ball valve, it is not convenient to better protect the ball valve against low temperature, and it is not convenient to better open the automatic protection mechanism of the ball valve and effectively dissipate heat when the temperature is too high in summer, and it is not suitable for use in various weather conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of hard-sealed ball valves, and particularly to a hard-sealed ball valve with a low-temperature protection function. Background Technique

[0002] A ball valve is a valve in which a closing member (ball) is driven by a valve stem and rotates around the axis of the ball valve. The ball valve can be opened and closed by rotating 90 degrees. It has simple operation and small fluid resistance, and is widely used in industries such as petroleum, chemical industry, and electric power. Due to its compact structure, reliable sealing, and convenient operation, the ball valve occupies an important position in the national economy. For example:

[0003] A hard-sealed ball valve provided in the publication number CN107044546A includes a valve body, a valve stem, a ball, a hard-sealed valve seat, and a valve stem driving device. A flow channel is provided in the valve body. The valve stem and the ball are arranged in a linkage manner. The hard-sealed valve seat is installed in the flow channel and is in sealing cooperation with the ball. The ball includes sub-balls symmetrically arranged on both sides of the rotation axis of the valve stem. The cross-sections of the sub-balls on both sides are arc-shaped and the openings face each other. The arc-shaped lower end of the sub-ball is the installation end and is in rotational cooperation with the installation end of the other sub-ball. The arc-shaped upper end is the swinging end and approaches and moves away from the swinging end of the other sub-ball. A guiding member for guiding the swinging end of the ball to approach and rotate is provided at the end of the valve stem in linkage with the ball. A linkage cavity for the guiding block to extend into is provided at the swinging end of each sub-ball. The valve body is provided with a valve stem linkage portion around the valve stem and coaxial with the valve stem. With the above solution, the present invention provides a hard-sealed ball valve that extends the service life of the valve seat, shortens the response time of the valve, and reduces the starting torque requirement of the valve stem driving device.

[0004] Another example is a new type of hard-sealed ball valve provided in the publication number CN109268528A, which includes a main valve body and a sub-valve body fixedly connected by bolts. The main valve body includes a main valve seat, and the sub-valve body includes a sub-valve seat. The ball valve is connected to the main valve body and the sub-valve body through the main valve seat and the sub-valve seat respectively. An upper rotation unit and a lower rotation unit with the same structure are respectively provided at the top and bottom of the ball valve. They respectively include a first valve stem and a second valve stem, which can apply rotational forces to the ball valve respectively to make the ball valve rotate. When ensuring that the valve stem will not be damaged due to excessive torque, the ball valve can receive a rotation twice that of a single valve stem.

[0005] The above existing technical solutions have the following defects:

[0006] 1. Although the existing hard-sealed ball valves can shorten the response time of the valve and reduce the starting torque requirement of the valve stem driving device when in use, they cannot effectively buffer the connection of internal parts during the rotation and closing and opening, which is not convenient for better long-term use of internal parts.

[0007] 2. When using the ball valve, since winter is approaching, the ball valve is prone to damage, making it inconvenient to better protect the ball valve from low temperatures.

[0008] 3. In summer, due to the too high temperature, it is not convenient to better open the automatic protection mechanism of the ball valve for effective heat dissipation, and it is not suitable for use in various weather conditions. Therefore, the present invention provides a hard-sealed ball valve with a low-temperature protection function to solve the above-mentioned problems. Summary of the Invention

[0009] The purpose of the present invention is to provide a hard-sealed ball valve with a low-temperature protection function to solve the problems in the above-mentioned background technology that the existing hard-sealed ball valve cannot effectively connect and buffer internal parts, is not convenient for better long-term use of internal parts, when using the ball valve, it is prone to damage due to the approaching of winter, it is not convenient to better protect the ball valve from low temperatures, in summer, due to the too high temperature, it is not convenient to better open the automatic protection mechanism of the ball valve for effective heat dissipation, and it is not suitable for use in various weather conditions.

[0010] To achieve the above purpose, the present invention provides the following technical solution: A hard-sealed ball valve with a low-temperature protection function, including: a first connection pipe of the ball valve, a second connection pipe of the ball valve arranged outside the first connection pipe of the ball valve, and a ball valve bead installed inside the first connection pipe of the ball valve, and further including:

[0011] A first connection outer ring, the outer end of the first connection pipe of the ball valve is welded and fixed with the first connection outer ring, and the outer end of the first connection outer ring is fitted with a second connection outer ring, and threaded rods are installed inside both the first connection outer ring and the second connection outer ring, nuts are arranged on the outer surface of the threaded rods, a ball valve through groove is opened inside the ball valve bead, and the lower end of the first connection pipe of the ball valve is connected with a heat preservation bottom plate;

[0012] A connection cylinder, which is fixedly arranged in the middle of the upper end of the first connection pipe of the ball valve, and a first protection plate is arranged outside the connection cylinder, the outer end of the first protection plate is rotatably connected with a second protection plate, and heat preservation pipes are arranged inside both the first protection plate and the second protection plate, a motor is arranged at the upper end of the first protection plate, a side protection outer plate is connected through the inside of the first protection plate, a connection groove is opened at the upper end inside the second protection plate, and a T-shaped groove is opened below the connection groove.

[0013] As a preferred technical solution of the present invention, the ball valve through groove further includes a spacer column arranged at the upper end of the ball valve through groove, a connection groove is opened inside the spacer column, a blocking block is arranged inside the connection groove, a spring is installed on the outer surface of the blocking block, a support pressure rod is arranged at the upper end of the blocking block, a hand lever is arranged at the upper end of the support pressure rod, and a connection top cover connected with the connection cylinder is arranged outside the support pressure rod.

[0014] As a preferred technical solution of the present invention, the blocking blocks are arranged at equal angles on the outer surface of the lower end of the supporting pressure rod, and groove-shaped structures matching the blocking blocks are opened at equal angles inside the connecting groove, and the supporting pressure rod is relatively slidably connected to the spacer column through a spring.

[0015] As a preferred technical solution of the present invention, the motor further includes a stable support rod arranged at the lower end of the motor, a collar block is installed on the outer surface of the stable support rod, a stable rod is fixedly connected to the outer end of the collar block, and a fixing rod is arranged at the outer end of the collar block.

[0016] As a preferred technical solution of the present invention, the stable support rod and the collar block are connected by a threaded manner, and the collar block is slidably connected to the second protective plate through the stable rod.

[0017] As a preferred technical solution of the present invention, the collar block is fixedly connected to the side protective outer plate through the fixing rod, and the side protective outer plate is slidably connected to the first protective plate.

[0018] As a preferred technical solution of the present invention, the stable support rod further includes a protective block arranged at the lower end of the stable support rod, an installation disc fixedly connected to the stable support rod is arranged inside the protective block, a limiting disc is arranged at the outer end of the installation disc, a first support rod is installed at the outer end of the limiting disc, a second support rod is arranged inside the first support rod, a stable outer block is installed at the outer end of the second support rod, and a T-shaped outer plate is arranged at the outer end of the stable outer block.

[0019] As a preferred technical solution of the present invention, the installation disc and the limiting disc are connected by an engaging manner, and the limiting disc is fixedly connected to the first support rod.

[0020] As a preferred technical solution of the present invention, the first support rod and the second support rod are connected by a threaded manner, and the thread directions at the front and rear ends of the second support rod are opposite.

[0021] As a preferred technical solution of the present invention, the stable outer block and the T-shaped outer plate are rotatably connected, and the T-shaped outer plate is slidably connected to the second protective plate.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The hard-sealed ball valve with low-temperature protection function solves the problems that the existing hard-sealed ball valve cannot effectively connect and buffer internal parts, is not convenient for better long-term use of internal parts, the ball valve is prone to damage when in use due to the coming of winter, it is not convenient for better low-temperature protection of the ball valve, and it is not convenient for better opening of the automatic protection mechanism of the ball valve and effective heat dissipation in summer due to too high temperature, and it is not suitable for use in various weather conditions.

[0023] 1. The blocking blocks are arranged at equal angles on the outer surface of the lower end of the supporting pressure rod, and groove-like structures that match the blocking blocks are opened at equal angles inside the connecting groove. Moreover, the supporting pressure rod is connected to the spacer column through a spring for relative sliding connection. Through the setting of the blocking blocks, the blocking blocks are connected to the spacer column. When the supporting pressure rod is rotated, the supporting pressure rod can drive the ball valve bead to rotate through the spacer column, facilitating the adjustment of the opening and closing of the ball valve. At the same time, when rotating, the spring expands and contracts, and the blocking blocks slide inside the spacer column, enabling the ball valve bead to stably fit against the inner wall of the first connecting pipe of the ball valve, thereby buffering the interior during rotation and increasing the service life of the parts.

[0024] 2. The T-shaped outer plate is connected to the second protective plate in a sliding manner. By starting the motor, the motor drives the stable support rod to rotate. At the same time, the collar block slides on the outer surface of the stable support rod. When the collar block slides, a connecting groove is opened at the upper end inside the second protective plate, and a T-shaped groove is opened below the connecting groove. The stable rod follows the collar block and slides inside the T-shaped groove, driving the collar block to drive the side protective outer plate to slide inside the second protective plate, thereby opening the left and right ends of the ball valve. Through the movement of the side protective outer plate, the two sides of the ball valve can be simultaneously closed, increasing the protection and improving the low-temperature protection degree.

[0025] 3. When the stable support rod is rotated, the mounting disc rotates accordingly, driving the limiting disc to rotate, thereby moving the second support rod inside the first support rod. At the same time, the stable outer block rotates inside the T-shaped outer plate, causing the T-shaped outer plate to move inside the T-shaped groove of the second protective plate, and the second protective plate rotates at the outer end of the first protective plate, causing the second protective plate to tilt. When the second protective plate is rotated and opened, it will open the outer end of the ball valve for heat dissipation, facilitating use in summer. In winter, rotate the stable support rod in the reverse direction to close and protect the outer end of the ball valve, playing a role in low-temperature protection. The automatic opening and closing improve the automation level. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the overall sectional structure of the connection between the first protective plate and the second protective plate of the present invention;

[0028] Figure 3 It is a schematic diagram of the overall sectional structure of the connection between the second protective plate and the heat preservation bottom plate of the present invention;

[0029] Figure 4 It is a schematic diagram of the overall sectional structure of the connection between the first connecting pipe of the ball valve and the through groove of the ball valve of the present invention;

[0030] Figure 5 Schematic diagram of the overall sectional structure of the heat preservation bottom plate and the second protection plate of the present invention;

[0031] Figure 6 Schematic diagram of the overall exploded structure of the connection between the first support rod and the second support rod of the present invention;

[0032] Figure 7 Schematic diagram of the overall sectional structure of the connection between the connecting cylinder and the protection block of the present invention;

[0033] Figure 8 For the present invention Figure 5 Schematic diagram of the enlarged structure at position A in;

[0034] Figure 9 Schematic diagram of the overall exploded structure of the connection between the ball valve bead and the support pressure rod of the present invention;

[0035] Figure 10 For the present invention Figure 7 Schematic diagram of the enlarged structure at position B in.

[0036] In the figure: 1. First connecting pipe of the ball valve; 2. First connecting outer ring; 3. Second connecting pipe of the ball valve; 4. Second connecting outer ring; 5. Threaded rod; 6. Nut; 7. Ball valve bead; 8. Ball valve through groove; 9. Spacer column; 10. Connecting groove; 11. Support pressure rod; 12. Blocking block; 13. Spring; 14. Connecting top cover; 15. Hand lever; 16. Connecting cylinder; 17. First protection plate; 18. Second protection plate; 19. Heat preservation pipe; 20. Heat preservation bottom plate; 21. Motor; 22. Stable support rod; 23. Sleeve block; 24. Stable rod; 25. Fixed rod; 26. Protection block; 27. Installation disc; 28. Limit disc; 29. First support rod; 30. Second support rod; 31. Stable outer block; 32. T-shaped outer plate; 33. Side protection outer plate; 34. T-shaped groove; 35. Connecting groove. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figures 1-10, the present invention provides a technical solution: a hard-sealed ball valve with low-temperature protection function, including a first connecting pipe 1 of the ball valve, a second connecting pipe 3 of the ball valve arranged outside the first connecting pipe 1 of the ball valve, and a ball valve bead 7 installed inside the first connecting pipe 1 of the ball valve. It further includes: a first connecting outer ring 2, the outer end of the first connecting pipe 1 of the ball valve is welded and fixed with the first connecting outer ring 2, and the outer end of the first connecting outer ring 2 is attached with a second connecting outer ring 4, and threaded rods 5 are installed inside both the first connecting outer ring 2 and the second connecting outer ring 4. As Figure 1 and Figure 4 shown, nuts 6 are arranged on the outer surface of the threaded rods 5, a ball valve through groove 8 is opened inside the ball valve bead 7, and the lower end of the first connecting pipe 1 of the ball valve is connected with a heat preservation bottom plate 20; by rotating the hand lever 15, the hand lever 15 drives the support pressure rod 11 to rotate, thereby driving the ball valve bead 7 to rotate. At this time, the ball valve through groove 8 and the second connecting pipe 3 of the ball valve are horizontally opened, so that water is conveyed through the second connecting pipe 3 of the ball valve to the inside of the other second connecting pipe 3 of the ball valve and discharged. Specifically, as Figure 2 and Figure 5 shown, a connecting cylinder 16 is fixedly arranged in the middle of the upper end of the first connecting pipe 1 of the ball valve, a first protection plate 17 is arranged outside the connecting cylinder 16, a second protection plate 18 is rotatably connected to the outer end of the first protection plate 17, and heat preservation pipes 19 are arranged inside both the first protection plate 17 and the second protection plate 18. A motor 21 is arranged at the upper end of the first protection plate 17, and a side protection outer plate 33 penetrates and is connected inside the first protection plate 17. The outer end of the ball valve is protected by the first protection plate 17, the second protection plate 18 and the heat preservation bottom plate 20. At the same time, the arrangement of the heat preservation pipes 19 can well heat-insulate the outer end of the ball valve, thereby providing low-temperature protection.

[0039] Specifically, as Figure 7 and Figure 9Among them, the ball valve through groove 8 further includes a spacer column 9 provided at the upper end of the ball valve through groove 8, and an engagement groove 10 is provided inside the spacer column 9. A blocking block 12 is provided inside the engagement groove 10, and a spring 13 is installed on the outer surface of the blocking block 12. A support pressure rod 11 is provided at the upper end of the blocking block 12, and a handle rod 15 is provided at the upper end of the support pressure rod 11. A connection top cover 14 connected to the connection cylinder 16 is provided on the outer side of the support pressure rod 11. The blocking blocks 12 are arranged at equal angles on the outer surface of the lower end of the support pressure rod 11, and groove-like structures that match the blocking blocks 12 are provided at equal angles inside the engagement groove 10. Moreover, the support pressure rod 11 is connected to the spacer column 9 through the spring 13 for relative sliding connection. Through the setting of the blocking block 12, the blocking block 12 is connected to the spacer column 9. When the support pressure rod 11 is rotated, the support pressure rod 11 can drive the ball valve bead 7 to rotate through the spacer column 9, facilitating the adjustment of the opening and closing of the ball valve. At the same time, when rotating, the spring 13 expands and contracts, sliding the blocking block 12 inside the spacer column 9, enabling the ball valve bead 7 to stably fit against the inner wall of the ball valve first connection pipe 1, thereby buffering the interior during rotation and increasing the service life of the parts.

[0040] Specifically, as Figure 3 and Figure 6In it, the motor 21 further includes a stable support rod 22 arranged at the lower end of the motor 21, and a collar block 23 is installed on the outer surface of the stable support rod 22, and a stable rod 24 is fixedly connected to the outer end of the collar block 23. A fixing rod 25 is arranged at the outer end of the collar block 23. The stable support rod 22 is connected to the collar block 23 in a threaded manner, and the collar block 23 is connected to the second protection plate 18 in a sliding manner through the stable rod 24. The collar block 23 is fixedly connected to the side protection outer plate 33 through the fixing rod 25, and the side protection outer plate 33 is connected to the first protection plate 17 in a sliding manner. The stable support rod 22 further includes a protection block 26 arranged at the lower end of the stable support rod 22, and an installation disc 27 fixedly connected to the stable support rod 22 is arranged inside the protection block 26. A limiting disc 28 is arranged at the outer end of the installation disc 27, and a first support rod 29 is installed at the outer end of the limiting disc 28. A second support rod 30 is arranged inside the first support rod 29, and a stable outer block 31 is installed at the outer end of the second support rod 30. A T-shaped outer plate 32 is arranged at the outer end of the stable outer block 31. The installation disc 27 is connected to the limiting disc 28 in a meshing manner, and the limiting disc 28 is fixedly connected to the first support rod 29. The first support rod 29 is connected to the second support rod 30 in a threaded manner, and the thread directions at the front and rear ends of the second support rod 30 are opposite. The stable outer block 31 is connected to the T-shaped outer plate 32 in a rotating manner, and the T-shaped outer plate 32 is connected to the second protection plate 18 in a sliding manner. By starting the motor 21, the motor 21 drives the stable support rod 22 to rotate. At the same time, the collar block 23 slides on the outer surface of the stable support rod 22. When the collar block 23 slides, a connection groove 35 is opened at the upper end inside the second protection plate 18, and a T-shaped groove 34 is opened at the lower side of the connection groove 35. The stable rod 24 slides inside the T-shaped groove 34 following the collar block 23, driving the collar block 23 to drive the side protection outer plate 33 to slide inside the second protection plate 18, thereby opening the left and right ends of the ball valve. Through the movement of the side protection outer plate 33, the two sides of the ball valve can be closed simultaneously at both ends, increasing the protection performance and improving the low-temperature protection degree.

[0041] Specifically, as Figure 8 and Figure 10When the stabilizing support rod 22 is rotated simultaneously, the mounting disc 27 is driven to rotate, and the mounting disc 27 drives the limiting disc 28 to rotate, so as to move the second support rod 30 inside the first support rod 29. At the same time, the stabilizing outer block 31 rotates inside the T-shaped outer plate 32, causing the T-shaped outer plate 32 to move in the T-shaped groove 34 inside the second protective plate 18, and the second protective plate 18 to rotate at the outer end of the first protective plate 17, so that the second protective plate 18 tilts. When the second protective plate 18 is rotated, when it is opened, the outer end of the ball valve will be opened for heat dissipation, which is convenient for use in summer. In winter, the stabilizing support rod 22 is rotated in the reverse direction to close and protect the outer end of the ball valve, playing a role in low-temperature protection. The automatic opening and closing improve the automation level. This is the usage method of the hard-sealed ball valve with low-temperature protection function.

[0042] All the standard parts used in the present invention can be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0043] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hard-sealed ball valve with low-temperature protection function, comprising: The first connecting pipe (1) of the ball valve, the second connecting pipe (3) of the ball valve arranged outside the first connecting pipe (1) of the ball valve, and the ball valve bead (7) installed inside the first connecting pipe (1) of the ball valve are characterized in that it further comprises: The first connecting outer ring (2), the outer end of the first connecting pipe (1) of the ball valve is welded and fixed with the first connecting outer ring (2), and the outer end of the first connecting outer ring (2) is fitted with the second connecting outer ring (4), and threaded rods (5) are installed inside both the first connecting outer ring (2) and the second connecting outer ring (4). Nuts (6) are arranged on the outer surface of the threaded rods (5). A ball valve through groove (8) is opened inside the ball valve bead (7). The lower end of the first connecting pipe (1) of the ball valve is connected with a heat preservation bottom plate (20); The connecting cylinder (16) is fixedly arranged in the middle of the upper end of the first connecting pipe (1) of the ball valve. A first protection plate (17) is arranged on the outer side of the connecting cylinder (16). The outer end of the first protection plate (17) is rotatably connected with a second protection plate (18). Heat preservation pipes (19) are arranged inside both the first protection plate (17) and the second protection plate (18). A motor (21) is arranged at the upper end of the first protection plate (17). A side protection outer plate (33) is connected through the inside of the first protection plate (17). A connecting groove (35) is opened at the upper end inside the second protection plate (18), and a T-shaped groove (34) is opened at the lower side of the connecting groove (35). The ball valve through groove (8) further comprises a spacer column (9) arranged at the upper end of the ball valve through groove (8). An engagement groove (10) is opened inside the spacer column (9). A blocking block (12) is arranged inside the engagement groove (10). A spring (13) is installed on the outer surface of the blocking block (12). A support pressure rod (11) is arranged at the upper end of the blocking block (12). A handle rod (15) is arranged at the upper end of the support pressure rod (11). A connecting top cover (14) connected with the connecting cylinder (16) is arranged on the outer side of the support pressure rod (11); The blocking blocks (12) are arranged at equal angles on the outer surface of the lower end of the support pressure rod (11). Groove structures matching the blocking blocks (12) are opened at equal angles inside the engagement groove (10). The support pressure rod (11) is connected with the spacer column (9) through the spring (13) in a relatively sliding manner. The motor (21) further comprises a stable support rod (22) arranged at the lower end of the motor (21). A collar block (23) is installed on the outer surface of the stable support rod (22). A stable rod (24) is fixedly connected to the outer end of the collar block (23). A fixed rod (25) is arranged at the outer end of the collar block (23).

2. The hard-sealed ball valve with a low-temperature protection function according to claim 1, wherein: The stable support rod (22) is connected with the collar block (23) in a threaded manner, and the collar block (23) is connected with the second protection plate (18) in a sliding manner through the stable rod (24).

3. A hard-sealed ball valve with a low-temperature protection function according to claim 1, characterized in that: The collar block (23) is fixedly connected with the side protection outer plate (33) through the fixed rod (25), and the side protection outer plate (33) is connected with the first protection plate (17) in a sliding manner.

4. A hard-sealed ball valve with a low-temperature protection function according to claim 1, characterized in that: The stable support rod (22) further includes a protective block (26) provided at the lower end of the stable support rod (22), and an installation disc (27) fixedly connected to the stable support rod (22) is provided inside the protective block (26). A limiting disc (28) is provided at the outer end of the installation disc (27), and a first support rod (29) is installed at the outer end of the limiting disc (28). A second support rod (30) is provided inside the first support rod (29), and a stable outer block (31) is installed at the outer end of the second support rod (30). A T-shaped outer plate (32) is provided at the outer end of the stable outer block (31).

5. The hard-sealed ball valve with low-temperature protection function according to claim 4, characterized in that: The installation disc (27) and the limiting disc (28) are connected in a meshing manner, and the limiting disc (28) is fixedly connected to the first support rod (29).

6. A hard-sealed ball valve with a low-temperature protection function according to claim 4, characterized in that: The first support rod (29) and the second support rod (30) are connected in a threaded manner, and the thread directions at the front and rear ends of the second support rod (30) are opposite.

7. A hard-sealed ball valve with low-temperature protection function according to claim 4, characterized in that: The stable outer block (31) and the T-shaped outer plate (32) are connected in a rotatable manner, and the T-shaped outer plate (32) and the second protective plate (18) are connected in a slidable manner.

Images