A ball valve for pneumatic high pressure difference emergency drainage

Abstract

The utility model relates to the technical field of ball valve, and disclose a kind of ball valve for pneumatic high pressure difference emergency drain, including valve body, and emergency drain assembly is arranged on valve body, emergency drain assembly includes two protective boxes, protective box is respectively fixedly connected on the upper and lower surfaces of valve body, bearing is fixedly installed in the inside of protective box, by setting emergency drain assembly, when main channel drain efficiency is insufficient or local high pressure exists in pipeline, control system can open the micro stop valve on auxiliary drain pipe synchronously, water flows through auxiliary drain pipe, connecting pipe and converges into main drain pipe, forms main channel plus auxiliary channel double drain;The design not only improves drain efficiency, ensures that pressure difference is rapidly reduced to safe range, but also can accurately control auxiliary channel through micro stop valve, avoid excessive drain to cause water resource waste, adapt to the drain demand of different high pressure difference scene, solve the problem that traditional single-channel drain efficiency is low and scene adaptability is poor.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, specifically a ball valve for emergency drainage under pneumatic high pressure differential. Background Technology

[0002] In high-pressure fluid systems (such as steam pipelines and high-temperature, high-pressure water systems) in fields such as chemical engineering, power, and energy, it is necessary to use condensate draining devices to promptly remove accumulated condensate or excess fluid from the system. This is to prevent excessive pressure differentials (often reaching 0.5-2 MPa) within the pipelines, which could lead to overpressure, equipment corrosion, or decreased fluid transport efficiency. Especially in emergency situations (such as a sudden increase in system pressure), condensate draining devices must have rapid response and efficient drainage capabilities to ensure the safe and stable operation of the system.

[0003] However, existing pneumatic steam trap ball valves generally adopt a single-channel single-drainage design. The single-channel structure relies solely on the ball's flow hole to achieve drainage. Under high pressure differential, the water flow resistance is large, the fluid flow velocity is limited by the cross-sectional area of ​​the flow hole, the drainage speed is slow, and it is impossible to quickly reduce the pipeline pressure differential to a safe range. Furthermore, it lacks an auxiliary diversion structure. When the main channel is slightly blocked by fluid impurities or faces a local high-pressure area, there is no backup drainage channel to be used, and it can only rely on the main channel to hold on, which further reduces the drainage efficiency. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a ball valve for emergency drainage under pneumatic high pressure differential. It solves the problems of existing pneumatic drainage ball valves that generally adopt a single-channel, single-drainage design. The single-channel structure relies solely on the flow hole of the ball to achieve drainage, resulting in high water flow resistance under high pressure differential. The fluid flow velocity is limited by the cross-sectional area of ​​the flow hole, leading to slow drainage speed and an inability to quickly reduce the pipeline pressure differential to a safe range. Furthermore, it lacks an auxiliary diversion structure. When the main channel is slightly blocked by fluid impurities or faces a local high-pressure area, there is no backup drainage channel to be used, and the main channel must be relied upon to maintain its position, further reducing drainage efficiency.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a ball valve for emergency drainage of pneumatic high pressure differential, comprising a valve body, an emergency drainage assembly provided on the valve body, the emergency drainage assembly comprising two protective boxes, the protective boxes being fixedly connected to the upper and lower surfaces of the valve body respectively, and bearings being fixedly installed inside the protective boxes;

[0008] The inner walls of both bearings are fixedly fitted with connecting shafts, and the opposite ends of the two connecting shafts are rotatably connected to the inner walls of the corresponding protective boxes.

[0009] The two bearings have opposite ends that penetrate into the interior of the valve body, and a ball is installed inside the valve body.

[0010] In this configuration, the opposite ends of both bearings are fixedly connected to the ball.

[0011] The front and rear surfaces of the upper protective box are provided with convex grooves that communicate with its interior.

[0012] Preferably, rectangular covers are fixedly connected to both the front and rear surfaces of the protective box described above, and the two rectangular covers are respectively connected to the corresponding convex grooves;

[0013] The inner walls of both rectangular covers are slidably connected to movable plates;

[0014] The front protective box contains a rack.

[0015] Preferably, the front and rear ends of the rack slide through the inner walls of the corresponding convex grooves, and the front and rear ends of the rack are fixedly connected to the corresponding movable plates.

[0016] A cylinder is fixedly installed inside the front rectangular cover, and the telescopic end of the cylinder is fixedly connected to the corresponding movable plate.

[0017] Preferably, a gear is fixedly sleeved on the outer wall of the connecting shaft mentioned above, and the gear meshes with the rack.

[0018] Preferably, a valve body inlet pipe communicating with the interior is fixedly connected to the front surface of the valve body, and a valve body outlet pipe communicating with the interior is fixedly connected to the rear surface of the valve body.

[0019] High-precision pressure transmitters are fixedly installed on the upper surfaces of both the valve body outlet pipe and the valve body inlet pipe. The detection ends of the two high-precision pressure transmitters pass through the interior of the valve body outlet pipe and the valve body inlet pipe, respectively.

[0020] Preferably, the valve body inlet pipe is fixedly connected to auxiliary drain pipes communicating with its interior on both the left and right sides, and a miniature shut-off valve is fixedly installed on each of the two auxiliary drain pipes.

[0021] Preferably, each of the two auxiliary drainage pipes has a fixed connection to a connecting pipe that communicates with its interior at its opposite ends, and both connecting pipes are connected to the main drainage pipe.

[0022] Preferably, both the valve body outlet pipe and the valve body inlet pipe are equipped with fixed flanges.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, this utility model provides a ball valve for emergency drainage under pneumatic high pressure differential, which has the following advantages:

[0025] By incorporating an emergency drainage component, when the main channel's drainage efficiency is insufficient or there is localized high pressure in the pipeline, the control system can simultaneously open the miniature shut-off valve on the auxiliary drainage pipe. Water flows through the auxiliary drainage pipe and connecting pipe into the main drain pipe, forming a dual drainage system consisting of the main channel and the auxiliary channel. This design not only improves drainage efficiency and ensures that the pressure difference quickly drops to a safe range, but also precisely controls the auxiliary channel through the miniature shut-off valve, avoiding excessive drainage and water waste. It adapts to the drainage needs of different high pressure difference scenarios, solving the problems of low drainage efficiency and poor scenario adaptability of traditional single-channel drainage systems. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the ball valve for pneumatic high-pressure differential emergency drainage according to this utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the valve body of this utility model;

[0028] Figure 3 This is a schematic diagram of the convex groove of this utility model;

[0029] Figure 4 This is a schematic diagram of the interior of the rectangular cover of this utility model;

[0030] Figure 5 This is a schematic diagram of the replaceable rack of this utility model;

[0031] Figure 6 This is a schematic diagram of the replaceable movable plate of this utility model.

[0032] In the diagram: 1. Valve body; 2. Valve body outlet pipe; 3. High-precision pressure transmitter; 4. Protective box; 5. Rectangular cover; 6. Auxiliary drain pipe; 7. Miniature shut-off valve; 8. Connecting pipe; 9. Gear; 10. Rack; 11. Convex groove; 12. Moving plate; 13. Cylinder; 14. Ball; 15. Connecting shaft; 16. Bearing. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figure 1-6 This utility model provides a new technical solution: a ball valve for emergency drainage under pneumatic high pressure differential, including an emergency drainage component, to achieve accurate monitoring, rapid drainage, and closed-loop control under high pressure differential. The emergency drainage component includes...

[0035] The valve body inlet pipe is fixed on the front surface of the valve body 1 and communicates with the inside of the valve body 1. A high-precision pressure transmitter 3 is fixedly installed on the upper surface, and auxiliary drain pipes 6 are fixedly connected on the left and right sides. It is used to introduce external high-pressure water flow, provide detection points for pressure monitoring, and provide diversion channels for auxiliary draining.

[0036] The valve body outlet pipe 2 is fixed on the rear surface of the valve body 1 and communicates with the interior of the valve body 1. A high-precision pressure transmitter 3 is fixedly installed on the upper surface, and a fixed flange is provided on the pipe body. It is used to discharge condensate water and connect to the external drainage pipeline. At the same time, it carries the pressure monitoring component and provides real-time feedback of the outlet water pressure.

[0037] Two high-precision pressure transmitters 3 are fixed on the upper surfaces of the valve body inlet pipe and valve body outlet pipe 2, respectively, with the detection end penetrating the inside of the inlet pipe; they monitor the inlet and outlet pressures in real time and transmit the pressure data to the control system in real time, providing accurate data support for pressure difference judgment, such as triggering an emergency procedure when ≥0.8MPa and stopping drainage when ≤0.2MPa, avoiding the problem of lag in traditional manual monitoring.

[0038] Fixed flanges are respectively installed on the valve body outlet pipe 2 and the valve body inlet pipe; used for quick fixed connection with external water supply pipes and drainage pipes to ensure tight pipe connection and avoid water leakage during the initial installation stage.

[0039] Two protective boxes 4 are fixed on the upper and lower surfaces of the valve body 1 respectively. Bearings 16 are fixedly installed inside. The upper protective box 4 has convex grooves 11 on the front and rear surfaces and rectangular covers 5 are fixedly connected to the front and rear surfaces. It protects the internal transmission components, provides a mounting base for the bearings 16, the convex grooves 11 provide sliding guides for the rack 10, and the rectangular covers 5 provide horizontal movement space for the moving plate 12.

[0040] Two bearings 16 are fixed inside the two protective boxes 4 respectively, and the inner wall is fixedly sleeved with the connecting shaft 15; to reduce the frictional resistance when the connecting shaft 15 rotates, to ensure that the connecting shaft 15 rotates smoothly, to avoid valve opening and closing delay due to jamming, and to ensure timely drainage of the main channel.

[0041] Two connecting shafts 15 are fixed to the inner walls of two bearings 16 respectively. Their opposite ends penetrate into the valve body 1 and are fixed to the ball 14. A gear 9 is fixedly sleeved on the outer wall of the upper connecting shaft 15; the rotational power of the gear 9 is transmitted to drive the ball 14 to rotate synchronously, thereby realizing the opening and closing of the main channel.

[0042] The ball 14 is located inside the valve body 1 and is fixedly connected to two connecting shafts 15. It has a flow hole. By rotating, the flow hole is aligned with the water inlet and outlet channels of the valve body 1. The main channel is opened, and the high-pressure water flows quickly or is misaligned. The main channel is closed, cutting off the water flow. The sealing surface of the ball 14 cooperates with the internal sealing structure of the valve body 1 to ensure no leakage when closed.

[0043] Gear 9 is fixedly sleeved on the outer wall of the upper connecting shaft 15 and meshes with rack 10; it converts the horizontal sliding of rack 10 into rotational power, driving connecting shaft 15 and ball 14 to rotate, realizing the power conversion for opening and closing the main channel.

[0044] The rack 10 is located inside the upper protective box 4, with its front and rear ends sliding through the convex groove 11 and fixed to the moving plate 12. Driven by the moving plate 12, it slides horizontally along the convex groove 11 and drives the connecting shaft 15 to rotate by meshing with the gear 9. The convex groove 11 restricts the vertical displacement of the rack 10 to avoid meshing misalignment.

[0045] Two rectangular covers 5 are fixed to the front and rear surfaces of the upper protective box 4 respectively, and communicate with the convex groove 11. The moving plate 12 is slidably connected inside. The cylinder 13 is fixedly installed inside the front rectangular cover 5 to provide horizontal guidance for the moving plate 12, prevent the moving plate 12 from shifting laterally, and ensure that the rack 10 slides smoothly.

[0046] Two movable plates 12 are slidably connected inside the two rectangular covers 5 and fixed to the front and rear ends of the rack 10. The front movable plate 12 is fixed to the telescopic end of the cylinder 13. It receives the telescopic power of the cylinder 13 and drives the rack 10 to move horizontally synchronously. It is the intermediate carrier for power transmission.

[0047] The cylinder 13 is fixed inside the front rectangular cover 5, and the telescopic end is fixed to the front movable plate 12; it provides a power source for the movement of the rack 10, gear 9, connecting shaft 15 and ball 14, and drives the movable plate 12 and rack 10 to move through the extension and retraction of the telescopic end, so as to realize the automatic opening and closing of the main channel.

[0048] Two auxiliary drainage pipes 6 are fixed on the left and right sides of the valve body inlet pipe respectively, and are connected to the inside of the valve body inlet pipe. A miniature shut-off valve 7 is fixedly installed on the upper surface, and a connecting pipe 8 is fixedly connected to the opposite end; it is used to divert the high-pressure water flow in the valve body inlet pipe to form an auxiliary drainage channel outside the main channel, thereby improving drainage efficiency.

[0049] Two miniature shut-off valves 7 are fixed on two auxiliary drainage pipes 6 respectively; the opening and closing are precisely controlled by the control system to avoid excessive drainage in the auxiliary channel, which would lead to water waste. They are suitable for different high pressure differential scenarios, such as insufficient efficiency of the main channel and drainage needs of local high pressure, solving the problems of low drainage efficiency and poor scenario adaptability of traditional single-channel drainage.

[0050] Two connecting pipes 8 are fixed to opposite ends of two auxiliary drainage pipes 6 and connected to the main drainage pipe; the diverted water flow in the auxiliary drainage pipes 6 is introduced into the main drainage pipe to achieve unified discharge of water flow in the main channel and auxiliary channel, ensuring the continuity of the dual drainage process.

[0051] Furthermore, when using the ball valve for pneumatic high-pressure differential emergency drainage, firstly, the ball valve is fixedly connected to the external water supply pipeline and drainage pipeline respectively through the fixed flange on the valve body outlet pipe 2 and the valve body inlet pipe; at the same time, the connecting pipes 8 on the two auxiliary drainage pipes 6 are fixedly connected to the main drainage pipe to ensure that the pipeline connection is tight and to avoid water leakage during the initial installation stage; then, the pipeline valves on the valve body outlet pipe 2 and the valve body inlet pipe are opened to allow water to flow into the valve body 1, and at the same time, the two high-precision pressure transmitters 3 are activated. The detection end of the high-precision pressure transmitters 3 monitors the inlet water pressure of the valve body inlet pipe and the outlet water pressure of the valve body outlet pipe 2 in real time, and transmits the pressure data to the control system in real time to provide accurate data support for subsequent judgment of high-pressure differential emergency drainage;

[0052] When the control system determines, based on the feedback data from the high-precision pressure transmitter 3, that the pressure difference between the valve body inlet pipe and the valve body outlet pipe 2 exceeds a preset threshold, such as when the pressure difference is set to ≥0.8MPa under high-pressure conditions, an emergency drainage procedure is immediately triggered: the cylinder 13 located inside the front rectangular cover 5 is activated, and the telescopic end of the cylinder 13 drives the movable plate 12, which is fixedly connected to it, to slide along the inner wall of the rectangular cover 5. The rectangular cover 5 provides horizontal guidance for the movable plate 12 to prevent lateral displacement; the movable plate 12 drives the rack 10 to move synchronously, and the front and rear ends of the rack 10 slide along the inner walls of the convex grooves 11 of the two protective boxes 4 respectively. The convex grooves 11 restrict the vertical displacement of the rack 10 to ensure that it only moves in a straight line in the horizontal direction, avoiding misalignment between the rack and the gear 9.

[0053] In this system, the rack 10 meshes with the gear 9 located on the outer wall of the upper connecting shaft 15. The horizontal sliding of the rack 10 will drive the gear 9 to rotate synchronously. The gear 9 drives the connecting shaft 15 to rotate around the bearing 16 inside the protective box 4. The bearing 16 reduces the frictional resistance when the connecting shaft 15 rotates, ensuring its smooth rotation and avoiding valve opening and closing delays due to jamming. The lower end of the connecting shaft 15 is fixedly connected to the ball 14 inside the valve body 1, thereby driving the ball 14 to rotate synchronously. When the flow hole of the ball 14 is fully aligned with the inlet and outlet water channels of the valve body 1, the valve body 1 is in a fully open state. The high-pressure water flows quickly from the valve body inlet pipe to the valve body outlet pipe 2 through the ball flow hole inside the valve body 1, realizing emergency drainage of the main channel and quickly reducing the pressure difference in the pipeline.

[0054] If the main channel drainage efficiency of valve body 1 is insufficient, or if there are still local high-pressure areas in the pipeline, the control system can simultaneously open the miniature shut-off valves 7 on the two auxiliary drainage pipes 6. The water flow is diverted through the valve body inlet pipe to the auxiliary drainage pipes 6, and then flows into the main drain pipe through the auxiliary drainage pipes 6 and connecting pipe 8, forming a dual drainage structure of main channel drainage plus auxiliary channel drainage, which further improves drainage efficiency and ensures that the pressure difference in the pipeline is quickly reduced to a safe range. The precise control of the miniature shut-off valves 7 can avoid water waste caused by excessive drainage of the auxiliary channels and adapt to the drainage needs of different high pressure difference scenarios.

[0055] During the emergency drainage process, two high-precision pressure transmitters 3 continuously monitor the pressure difference. When the control system determines that the pressure difference has dropped to a preset safe value, such as ≤0.2MPa, it immediately controls the cylinder 13 to retract in the opposite direction, causing the moving plate 12 and rack 10 to move in the opposite direction. The rack 10 drives the gear 9 and connecting shaft 15 to rotate in the opposite direction, thereby causing the ball 14 to rotate to the closed position. The sealing surface of the ball 14 is tightly fitted with the sealing structure inside the valve body 1, cutting off the main channel water flow. At the same time, the miniature shut-off valves 7 on the two auxiliary drainage pipes 6 are closed to stop the auxiliary drainage, completing the closed-loop control of the entire emergency drainage process.

[0056] In this design, by setting up an emergency drainage component, when the drainage efficiency of the main channel is insufficient or there is local high pressure in the pipeline, the control system can simultaneously open the miniature shut-off valve 7 on the auxiliary drainage pipe 6. Water flows through the auxiliary drainage pipe 6 and the connecting pipe 8 into the main drain pipe, forming a dual drainage system of the main channel and the auxiliary channel. This design not only improves drainage efficiency and ensures that the pressure difference is quickly reduced to a safe range, but also accurately controls the auxiliary channel through the miniature shut-off valve 7 to avoid excessive drainage and waste of water resources. It adapts to the drainage needs of different high pressure difference scenarios and solves the problems of low drainage efficiency and poor scenario adaptability of traditional single-channel drainage.

[0057] Example 1: Application of high-pressure vibration pipeline scenario where a T-shaped rack replaces the original rack 10.

[0058] like Figure 5 As shown

[0059] The high-pressure steam pipeline in a chemical workshop is subjected to high-frequency vibration for extended periods. Using the existing planar rack 10 revealed several key problems: First, vibration easily caused the rack to shift vertically, increasing the meshing clearance with the gear 9 and causing slippage. This resulted in delayed opening and closing of the ball 14, preventing the main channel from opening promptly during emergency drainage and causing a significant increase in pipeline pressure differentials. Second, the shifted rack experienced increased hard friction against the inner wall of the convex groove 11, leading to rapid wear of the rack teeth and requiring frequent replacement, resulting in high maintenance costs. Third, vibration caused uneven stress at the connection points between the rack ends and the moving plate 12, easily causing weld cracking and further compromising transmission stability, threatening the safety of the high-pressure pipeline. To address this, the original rack 10 was replaced with a T-shaped rack. The toothless side of the rack is integrally formed with a rectangular sliding plate, and the inner wall of the convex groove 11 has a groove adapted to the rectangular sliding plate. The machining precision of the rack teeth remains unchanged, and the fixed connection with the moving plate 12 is retained. The sliding plate and rack are made of the same high-strength alloy.

[0060] The rectangular slide plate and the groove of the convex groove 11 form a precise sliding fit, which completely limits the vertical displacement of the rack. Even under high frequency vibration, the meshing gap between the rack and the gear 9 remains stable and there is no meshing slippage. The ball 14 opens and closes in a timely manner. In case of emergency drainage, the main channel can be fully opened within a preset time to avoid abnormal increase in pipeline pressure difference and meet the safe operation requirements of high pressure vibration pipeline.

[0061] The guiding fit between the slide plate and the groove significantly reduces the hard friction between the rack and the inner wall of the convex groove 11. At the same time, the slide plate can disperse the impact force caused by vibration, avoid local overload of the teeth, and significantly reduce the wear rate of the rack teeth. The overall service life of the rack is greatly extended, reducing the number of downtime maintenance, reducing the pipeline maintenance cost in the chemical workshop, and ensuring production continuity.

[0062] The T-shaped structure makes the rack more evenly stressed, and there is no stress concentration at the connection between the two ends and the moving plate 12, which completely solves the problem of weld cracking. The power transmission is smooth during the transmission process without jamming or interruption, ensuring that the ball 14 moves smoothly during emergency drainage, further improving the overall reliability of the high-pressure pipeline drainage system and reducing safety hazards.

[0063] Example 2: Application of frequent start-stop pipeline scenarios where the original moving plate 12 is replaced by a ball-bearing moving plate. Figure 6 As shown

[0064] In the high-pressure feedwater system of thermal power plants, frequent emergency drainage start-up and shutdown operations are required. The original planar sliding structure of the movable plate 12 has revealed obvious problems during long-term use: First, the movable plate and the inner wall of the rectangular cover 5 are subject to sliding friction, and the cylinder 13 needs to output more power to push it. Long-term operation leads to high cylinder energy consumption, and the metal debris generated by friction is easy to accumulate in the rectangular cover, causing the movable plate to jam. During emergency drainage, there is a delay in action, which affects the pipeline pressure control. Second, the planar movable plate wears quickly, and frequent sliding makes the edge of the plate easy to produce burrs, which further aggravates the jamming phenomenon. Frequent grinding and maintenance are required, which affects the system response efficiency. Third, the high frictional resistance makes the connecting bolts between the movable plate and the rack 10 easy to loosen. Frequent inspection and tightening are required, which increases the workload of maintenance personnel. At this time, the original movable plate 12 is replaced with a ball-shaped movable plate. The four sides of the movable plate 12 that contact the inner wall of the rectangular cover 5 are inlaid with miniature balls. The ball material is wear-resistant ceramic. The plate structure remains unchanged, and the fixed connection with the telescopic end of the cylinder 13 and the rack 10 is retained. The ball protrudes slightly from the plate surface.

[0065] The miniature ball bearings convert the sliding friction between the moving plate and the inner wall of the rectangular cover 5 into rolling friction, which greatly reduces frictional resistance, reduces the power consumption of the cylinder 13, and eliminates the accumulation of metal debris. Even with frequent start-stop, the moving plate moves smoothly without jamming or delay. In emergency drainage, it can quickly drive the rack to slide, ensuring timely opening and closing of the main channel, which is suitable for the high-frequency drainage operation requirements of thermal power plants.

[0066] The reduced frictional resistance makes the connecting bolts between the moving plate and the rack 10 more evenly stressed, eliminating the risk of loosening and eliminating the need for frequent checks and tightening, thus significantly reducing the workload of maintenance personnel. At the same time, the failure rate of the cylinder 13 also decreases due to the reduced load, further reducing the overall maintenance cost of the high-pressure water supply system of the thermal power plant and improving the long-term reliable operation capability of the drainage system.

[0067] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ball valve for pneumatic high-pressure differential emergency drainage, comprising a valve body (1), characterized in that: An emergency drainage assembly is provided on the valve body (1). The emergency drainage assembly includes two protective boxes (4). The protective boxes (4) are fixedly connected to the upper and lower surfaces of the valve body (1) respectively. Bearings (16) are fixedly installed inside the protective boxes (4). Among them, the inner walls of the two bearings (16) are fixedly sleeved with connecting shafts (15), and the opposite ends of the two connecting shafts (15) are rotatably connected to the inner walls of the corresponding protective boxes (4); The two bearings (16) have their opposite ends penetrating into the interior of the valve body (1), and a ball (14) is provided inside the valve body (1). The opposite ends of the two bearings (16) are fixedly connected to the ball (14); Among them, the front and rear surfaces of the upper protective box (4) are provided with convex grooves (11) that communicate with its interior. Rectangular covers (5) are fixedly connected to the front and rear surfaces of the protective box (4) above, and the two rectangular covers (5) are respectively connected to the corresponding convex grooves (11); The inner walls of the two rectangular covers (5) are slidably connected with movable plates (12). Among them, a rack (10) is installed inside the front protective box (4). The front and rear ends of the rack (10) slide through the inner wall of the corresponding convex groove (11), and the front and rear ends of the rack (10) are fixedly connected to the corresponding movable plate (12). Among them, a cylinder (13) is fixedly installed inside the front rectangular cover (5), and the telescopic end of the cylinder (13) is fixedly connected to the corresponding movable plate (12); A gear (9) is fixedly sleeved on the outer wall of the connecting shaft (15) mentioned above, and the gear (9) meshes with the rack (10); The front surface of the valve body (1) is fixedly connected to the valve body inlet pipe that communicates with its interior, and the rear surface of the valve body (1) is fixedly connected to the valve body outlet pipe (2) that communicates with its interior. Among them, high-precision pressure transmitters (3) are fixedly installed on the upper surfaces of the valve body outlet pipe (2) and the valve body inlet pipe. The detection ends of the two high-precision pressure transmitters (3) pass through the interior of the valve body outlet pipe (2) and the valve body inlet pipe, respectively. The valve body inlet pipe is fixedly connected to auxiliary drain pipes (6) that communicate with its interior on both the left and right sides, and miniature shut-off valves (7) are fixedly installed on both auxiliary drain pipes (6).

2. A ball valve for pneumatic high-pressure differential emergency drainage according to claim 1, characterized in that: The two auxiliary drainage pipes (6) are fixedly connected to each other at opposite ends by a connecting pipe (8) that communicates with their interiors, and both connecting pipes (8) are connected to the main drainage pipe.

3. A ball valve for emergency drainage under pneumatic high pressure differential as described in claim 1, characterized in that: Both the valve body outlet pipe (2) and the valve body inlet pipe are equipped with fixed flanges.

4. A ball valve for pneumatic high-pressure differential emergency drainage according to claim 1, characterized in that: The rack (10) can be replaced with a T-shaped rack. The toothless side of the rack is integrally formed into a rectangular sliding plate. The processing accuracy of the rack teeth remains unchanged, and the fixed connection with the moving plate (12) is retained.

5. A ball valve for emergency drainage under pneumatic high pressure differential as described in claim 1, characterized in that: The movable plate (12) can be replaced with a ball-shaped movable plate, and the four sides of the movable plate (12) that contact the inner wall of the rectangular cover (5) are rotatably embedded with micro-balls.

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