High-pressure-resistant flat valve capable of being opened and closed quickly

Abstract

The invention relates to the technical field of valves, in particular to a high-pressure-resistant quick opening and closing flat valve which comprises a valve body, a first valve seat, a second valve seat, a valve plate and a valve rod. The first valve seat and the second valve seat are arranged in a medium channel of the valve body, the valve plate is arranged between the first valve seat and the second valve seat in a sealing and sliding mode, and the valve rod is in driving connection with the valve plate. The middle of the valve rod is slidably connected to a valve deck in the middle of the top of the valve body, the hand wheel driving mechanism is connected to the upper portion of the valve deck, a pressure relief pipeline is arranged on the valve body, and the two ends of the pressure relief pipeline are communicated with a high-pressure side cavity, back to the valve plate, of the first valve seat and a low-pressure side cavity, back to the valve plate, of the second valve seat respectively. The pressure relief pipeline is provided with a pressure relief control valve used for controlling connection and disconnection of the pressure relief pipeline. The pressure difference generated by high-pressure fluid on the two sides of the valve plate can be balanced before the valve plate is opened, the main factor causing huge operation torque is fundamentally eliminated, opening and closing of the valve plate are extremely labor-saving and rapid, and rapid opening and closing under the high-pressure working condition are achieved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically, to a high-pressure resistant, quick-opening and closing flat plate valve. Background Technology

[0002] As a fluid control device, the flat plate valve is widely used in high-pressure pipeline systems in industries such as petroleum, chemical, and energy. Its core working principle is to open and close the pipeline by driving the valve plate to move in a plane perpendicular to the direction of medium flow.

[0003] Under high-pressure conditions, existing flat-plate valves face a significant technical challenge: when the valve is closed, the high-pressure medium acts on the end face of the valve plate, generating enormous static pressure. This static pressure presses the valve plate tightly against the valve seat, causing a sharp increase in friction between the valve plate and the valve seat sealing surfaces. In actual operation, this enormous friction directly translates into the maximum operating torque required to open the valve, requiring operators to expend considerable physical strength to turn the handwheel or handle. This not only makes operation difficult and inefficient but also severely restricts the valve's opening and closing speed, making it difficult to meet the urgent needs for rapid shut-off in the process flow.

[0004] To alleviate the above problems, some improvements exist in the existing technology. For example, some solutions increase the handwheel diameter or add a gearbox to amplify the operator's output torque. However, this method only reduces the operating force to a limited extent and does not fundamentally eliminate the huge static pressure brought by the high-pressure fluid, and often results in a bulky valve structure and slow operation response. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a high-pressure resistant, rapidly openable and closeable flat plate valve, comprising: a valve body, a first valve seat and a second valve seat disposed within a medium channel of the valve body, a valve plate slidably disposed between the first valve seat and the second valve seat, a valve stem drivenly connected to the valve plate, and a handwheel drive mechanism for driving the valve stem. The valve stem is slidably connected in the middle to a valve cover at the top center of the valve body, and the handwheel drive mechanism is connected above the valve cover. A pressure relief pipe is provided on the valve body, and the two ends of the pressure relief pipe are respectively connected to the high-pressure side chamber of the first valve seat facing away from the valve plate and the low-pressure side chamber of the second valve seat facing away from the valve plate. A pressure relief control valve is provided on the pressure relief pipe for controlling the opening and closing of the pressure relief pipe.

[0007] Furthermore, the aforementioned high-pressure resistant and rapidly openable flat plate valve further includes: a balancing plug mechanism; the balancing plug mechanism includes: a plug seat assembly fixedly installed in the low-pressure side chamber, with an air bladder plug assembly connected to the side of the plug seat assembly near the valve plate; when the air bladder plug assembly is inflated, it can seal the medium passage of the plug seat assembly, forming a pressure balance chamber between the valve plate and the plug seat assembly, and the pressure balance chamber is connected to a pressure relief pipe; after the air bladder plug assembly is deflated, it can release the blockage of the medium passage of the plug seat assembly, allowing the medium to flow out through the medium passage of the plug seat assembly.

[0008] Furthermore, the plug assembly includes: an inner ring seat for connecting the airbag plug assembly, the outer side of the inner ring seat being connected to an outer ring seat fixedly connected to the inner wall of the low-pressure side chamber via multiple evenly arranged support beams, and a medium passage is formed between the inner ring seat and the outer ring seat.

[0009] Furthermore, the airbag plug assembly includes: a central shaft connected to the inner ring seat, an annular pressure bearing seat and an annular limiting seat fixedly connected to one end of the central shaft near the valve plate, an annular inflatable airbag sleeved on the central shaft located between the annular pressure bearing seat and the annular limiting seat, and the annular inflatable airbag can seal the side of the outer ring seat near the valve plate after inflation.

[0010] Furthermore, the annular limiting seat is located between the annular pressure bearing seat and the inner ring seat; multiple open sliding grooves are evenly arranged around the outer surface of the annular limiting seat, and multiple limiting slide plates are slidably connected in the multiple open sliding grooves. Each of the multiple limiting slide plates has a limiting baffle fixedly connected to its outer end, and the multiple limiting baffles are engaged with the outer side of the multiple annular expansion airbags; multiple limiting slots are opened on the inner side of the outer ring seat near the valve plate, which are one-to-one with the multiple limiting baffles; after the annular expansion airbag is inflated, it can push and drive the multiple limiting baffles to move in the direction of the multiple limiting slots. When the multiple limiting baffles are engaged in the multiple limiting slots, the annular expansion airbag is in contact with the side of the outer ring seat near the valve plate.

[0011] Furthermore, a return spring is fixedly connected between each limiting baffle and the annular limiting seat. After the annular expansion airbag is inflated, it causes the limiting baffle to stretch the return spring. After the annular expansion airbag is deflated, the limiting baffle returns to the axis of the annular limiting seat under the elastic force of the return spring.

[0012] Furthermore, a limiting block is fixed on the limiting slide, and the limiting block slides within the limiting groove on the side of the annular limiting seat.

[0013] Furthermore, each limiting baffle is fixed with an auxiliary stop bar at one end near the annular pressure seat, and the inner end of the auxiliary stop bar is slidably fitted in the auxiliary groove on the outer ring surface of the annular pressure seat.

[0014] Furthermore, multiple inflation and deflation tubes are uniformly and fixedly connected around the inner ring surface of the annular inflation bladder. These multiple inflation and deflation tubes are sealed and fixed within multiple air holes on the outer side of the central shaft. These multiple air holes communicate with the inflation and deflation chamber located inside the central shaft. The inflation and deflation chamber is fixedly connected to one end of an L-shaped air tube, which is located on the side of the central shaft away from the valve plate. The other end of the L-shaped air tube extends through a through-hole in the side wall of the valve body to the outside of the valve body. The through-hole and the L-shaped air tube are sealed and fixedly connected.

[0015] Furthermore, a tapered flow divider is provided on the side of the annular pressure bearing seat near the valve plate.

[0016] Furthermore, the central shaft is slidably connected in the central hole of the inner ring seat, and the protrusion fixed in the central hole of the inner ring seat is slidably fitted in the guide groove on the outer side of the central shaft; the annular limiting seat and the inner ring seat are connected by a buffer compression spring sleeved on the central shaft; the L-shaped air tube is a telescopic flexible tube.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: This invention discloses a high-pressure resistant, rapidly openable and closeable flat plate valve. Through a pressure relief pipe and a pressure relief control valve mounted on the valve body, it balances the pressure difference generated by the high-pressure fluid on both sides of the valve plate before opening, fundamentally eliminating the main cause of the large operating torque. This makes the valve plate opening and closing extremely effortless and rapid, achieving rapid opening and closing under high-pressure conditions. The invention also includes a balancing plug mechanism. When the air-filled plug assembly inflates, it seals the medium passage of the plug seat assembly, forming a pressure balance chamber between the valve plate and the plug seat assembly. This pressure balance chamber is connected to the pressure relief pipe, and the pressure balance chamber and the pressure relief pipe work together to construct a pressure-balanced chamber on the back of the valve plate, further ensuring and optimizing the pressure balance effect. Because the valve plate operates under light load after the pressure difference is essentially eliminated, wear and impact erosion on the valve plate and valve seat sealing surfaces are greatly reduced, effectively extending the service life of the flat plate valve. Simultaneously, the overall structure is compact, eliminating the need for a large and complex external force-saving mechanism, making it highly practical.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a perspective view of the flat plate valve of the present invention; Figure 2 This is a top view of the flat plate valve of the present invention; Figure 3 This is a cross-sectional view of the flat plate valve of the present invention; Figure 4 This is a first-view schematic diagram of the balance plug mechanism of the present invention; Figure 5 This is a second-view schematic diagram of the balance plug mechanism of the present invention; Figure 6 This is a schematic diagram of the plug assembly of the present invention; Figure 7 This is a schematic diagram of the airbag plug assembly of the present invention; Figure 8 This is a cross-sectional view of the airbag plug assembly of the present invention; Figure 9 This is a schematic diagram of the annular inflatable airbag of the present invention; Figure 10 This is a schematic diagram of the annular pressure bearing seat and the conical flow divider head of the present invention; Figure 11 This is a schematic diagram of the annular limiting seat of the present invention; Icons: Valve body 1; First valve seat 2; Second valve seat 3; Valve plate 4; Valve stem 5; Handwheel drive mechanism 6; Pressure relief pipe 7; Pressure relief control valve 8; Balance plug mechanism 9; Valve cover 10; Plug seat assembly 100; Inner ring seat 101; Support beam 102; Outer ring seat 103; Restriction groove 104; Airbag plug assembly 200; Central shaft 201; Annular pressure bearing seat 202; Annular restriction seat 203; Annular expansion airbag 204; Restriction slide plate 205; Restriction baffle 206; Buffer spring 207; Return spring 208; Auxiliary stop bar 209; Inflation / depression pipe 210; Inflation / depression chamber 211; L-shaped air pipe 212; Conical diverter head 213. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0022] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0023] The following is in conjunction with the appendix Figures 1-11 The present invention will be described in further detail below.

[0024] Example 1: like Figures 1-11 As shown, a high-pressure resistant, quick-opening and closing flat valve includes: a valve body 1, a first valve seat 2 and a second valve seat 3 disposed within a medium channel of the valve body 1, a valve plate 4 slidably disposed between the first valve seat 2 and the second valve seat 3, a valve stem 5 drivenly connected to the valve plate 4, and a handwheel drive mechanism 6 for driving the valve stem 5. The valve stem 5 is slidably connected to a valve cover 10 at the top center of the valve body 1. The handwheel drive mechanism 6 is connected above the valve cover 10. A pressure relief pipe 7 is provided on the valve body 1. The two ends of the pressure relief pipe 7 are respectively connected to the high-pressure side chamber of the first valve seat 2 facing away from the valve plate 4 and the low-pressure side chamber of the second valve seat 3 facing away from the valve plate 4. A pressure relief control valve 8 is provided on the pressure relief pipe 7 for controlling the opening and closing of the pressure relief pipe 7.

[0025] The working principle and technical effects of the above scheme are as follows: In a high-pressure resistant, rapidly openable and closeable flat plate valve of the present invention, when the valve is in the closed state, the high-pressure medium acts on the end face of the valve plate 4. The side of the first valve seat 2 facing away from the valve plate 4 is the high-pressure side chamber, and the side of the second valve seat 3 facing away from the valve plate 4 is the low-pressure side chamber. There is a large pressure difference between the high-pressure side chamber and the low-pressure side chamber. This pressure difference causes the valve plate 4 to be tightly pressed against the valve seat, resulting in a sharp increase in the friction between the valve plate 4 and the valve seat sealing surface, increasing the difficulty of opening the valve. When it is necessary to open the valve, the operator first opens the pressure relief control valve 8 installed on the pressure relief pipe 7. At this time, the pressure relief pipe 7 connects the high-pressure side chamber and the low-pressure side chamber, and the high-pressure medium in the high-pressure side chamber flows to the low-pressure side chamber through the pressure relief pipe 7, thereby balancing the pressure difference generated by the high-pressure fluid on both sides of the valve plate 4. After the pressure difference decreases, the friction between the valve plate 4 and the valve seat sealing surface decreases significantly. The operator drives the valve stem 5 to move via the handwheel drive mechanism 6. The handwheel drive mechanism 6 can adopt a conventional handwheel structure, which will not be described in detail here. The valve stem 5 drives the valve plate 4 to slide in a sealing manner between the first valve seat 2 and the second valve seat 3, thereby opening the valve. When closing the valve, the process is reversed: first, the handwheel drive mechanism 6 drives the valve stem 5 to move the valve plate 4 to the closed position, and then the pressure relief control valve 8 is closed.

[0026] Example 2: like Figures 1-11 As shown, the high-pressure resistant and quick-opening / closing flat valve further includes a balancing plug mechanism 9. The balancing plug mechanism 9 includes a plug seat assembly 100 fixedly installed in the low-pressure side chamber, and an air bladder plug assembly 200 connected to the side of the plug seat assembly 100 near the valve plate 4. When the air bladder plug assembly 200 is inflated, it can seal the medium passage of the plug seat assembly 100, so that a pressure balance chamber is formed between the valve plate 4 and the plug seat assembly 100, and the pressure balance chamber is connected to the pressure relief pipe 7. After the air bladder plug assembly 200 is deflated, it can release the blockage of the medium passage of the plug seat assembly 100, so that the medium can flow out through the medium passage of the plug seat assembly 100.

[0027] The working principle and technical effects of the above scheme are as follows: In a high-pressure resistant, rapidly openable and closeable flat valve of the present invention, the plug seat assembly 100 of the balancing plug mechanism 9 is fixedly installed in the low-pressure side chamber, and an air bladder plug assembly 200 is connected to the side of the valve plate 4. When it is necessary to form a pressure balance chamber between the valve plate 4 and the plug seat assembly 100, the air bladder plug assembly 200 is inflated, thereby sealing the medium passage of the plug seat assembly 100. At this time, the pressure balance chamber is connected to the pressure relief pipe 7, and the medium in the high-pressure side chamber can enter the pressure balance chamber through the pressure relief pipe 7 to achieve pressure balance. When it is necessary to discharge the medium, the air bladder plug assembly 200 is deflated, and the air bladder plug assembly 200 releases the blockage of the medium passage of the plug seat assembly 100, allowing the medium to flow out through the medium passage of the plug seat assembly 100.

[0028] This invention, through the inflation and deflation of the airbag plug assembly 200, allows for flexible control of the formation of the pressure balance chamber and the flow of the medium, thereby achieving precise adjustment of the pressure on both sides of the valve plate 4. Compared to simple pressure relief methods, this structure can more accurately balance the pressure, improving the stability and reliability of the valve. When the valve is closed, the formation of the pressure balance chamber makes the pressure on both sides of the valve plate 4 more uniform, reducing the risk of leakage caused by uneven pressure and enhancing the valve's sealing performance.

[0029] Furthermore, when the flat valve is closed, the balancing plug mechanism 9 can also prevent leakage. In this state, the airbag plug assembly 200 is inflated, causing it to expand and seal the medium passage of the seat assembly 100, forming a leak-proof zone between the balancing plug mechanism 9 and the valve plate 4. A liquid sensor is installed within this leak-proof zone. With the flat valve closed, the special structure of the balancing plug mechanism 9 allows the airbag plug assembly 200 to expand and seal the medium passage of the seat assembly 100, forming a leak-proof zone between the balancing plug mechanism 9 and the valve plate 4. A liquid sensor is installed in this zone, enabling both leak prevention and leakage monitoring. The seat assembly 100 in the balancing plug mechanism 9 is fixedly installed in the low-pressure side chamber. When the flat valve is closed, the airbag plug assembly 200 is inflated, sealing the medium passage of the seat assembly 100. This creates a relatively enclosed space between the balancing plug mechanism 9 and the valve plate 4, forming a leak-proof zone. This leak-proof zone acts as a physical barrier, preventing the medium from further leaking from the low-pressure side chamber to other areas. Even with a certain sealing gap between the valve plate 4 and the valve seat, the leak-proof zone can still block the leakage path of the medium to a certain extent, improving the overall sealing performance of the flat valve and enhancing the reliability of the valve in the closed state. The leak-proof zone can also act as a pressure buffer area. When a small amount of high-pressure medium leaks between the valve plate 4 and the balance plug mechanism 9, the leak-proof zone can contain the leaked medium, preventing it from directly spreading to the outside, thereby reducing the impact of leakage on the surrounding environment and equipment.

[0030] Furthermore, a liquid sensor is positioned within the leak-proof zone formed by the balance plug mechanism 9 and the valve plate 4. When media leaks into this zone, the liquid sensor detects its presence and transmits a signal to the relevant monitoring system. The liquid sensor can monitor the leak-proof zone in real time for any media leakage. Once a leak is detected, an alarm is issued promptly, notifying operators to take appropriate measures, such as checking the valve seal and performing maintenance. This helps to identify potential leaks in a timely manner, preventing further deterioration and ensuring the safe operation of the equipment. Analysis of the liquid sensor data allows for the evaluation and prediction of the valve's sealing performance. If the liquid sensor frequently detects leaks, or if the leakage gradually increases, it indicates a potential sealing failure in the valve, prompting an early warning signal for preventative maintenance and reducing equipment malfunctions and downtime.

[0031] Example 3: like Figures 1-11As shown, the plug assembly 100 includes an inner ring seat 101 for connecting the airbag plug assembly 200. The outer side of the inner ring seat 101 is connected to an outer ring seat 103 fixedly connected to the inner wall of the low-pressure side chamber via multiple evenly arranged support beams 102. A medium passage is formed between the inner ring seat 101 and the outer ring seat 103. The airbag plug assembly 200 includes a central shaft 201 connected to the inner ring seat 101. One end of the central shaft 201 near the valve plate 4 is fixedly connected to an annular pressure bearing seat 202 and an annular limiting seat 203. An annular inflatable airbag 204, sleeved on the central shaft 201, is located between the annular pressure bearing seat 202 and the annular limiting seat 203. After inflation, the annular inflatable airbag 204 can seal the outer ring seat 103 on the side near the valve plate 4.

[0032] The working principle and technical effects of the above scheme are as follows: In a high-pressure resistant, rapidly openable and closeable flat valve of the present invention, the plug seat assembly 100 is composed of an inner ring seat 101, a support beam 102, and an outer ring seat 103. The inner ring seat 101 connects to the airbag plug assembly 200, and its outer surface is connected to the outer ring seat 103, which is fixedly connected to the inner wall of the low-pressure side chamber, via multiple evenly arranged support beams 102. A medium passage is formed between the inner ring seat 101 and the outer ring seat 103. When the medium needs to flow out from the low-pressure side chamber through the plug seat assembly 100, it passes through this medium passage. The multiple evenly arranged support beams 102 ensure the stability of the connection between the inner ring seat 101 and the outer ring seat 103, enabling the plug seat assembly 100 to withstand certain pressure and external impacts, ensuring that it will not easily deform or be damaged under high-pressure conditions, thereby ensuring the reliability and stability of the entire balanced plug mechanism 9. The medium passage formed between the inner ring seat 101 and the outer ring seat 103 provides a smooth flow channel for the medium. The uniform distribution of the support beam 102 avoids excessive obstruction to the flow of the medium, allowing the medium to pass through the medium passage more evenly, reducing flow resistance and pressure loss, and improving the working efficiency of the valve; the inner ring seat 101 is specifically used to connect the air bladder plug assembly 200, making the installation of the air bladder plug assembly 200 more convenient and accurate, and facilitating the coordinated work of the air bladder plug assembly 200 and the plug seat assembly 100.

[0033] In the airbag plug assembly 200, the central shaft 201 is connected to the inner ring seat 101, and its end near the valve plate 4 is fixedly connected to the annular pressure bearing seat 202 and the annular limiting seat 203. The annular expansion airbag 204 is sleeved on the central shaft 201 and located between the annular pressure bearing seat 202 and the annular limiting seat 203. When the annular expansion airbag 204 is inflated, it expands and seals the side of the outer ring seat 103 near the valve plate 4, thereby sealing the medium passage of the plug assembly 100. When the annular expansion airbag 204 is deflated, it contracts and releases the seal on the medium passage. After inflation, the annular expansion airbag 204 can tightly seal the side of the outer ring seat 103 near the valve plate 4, forming a good sealing effect. The method of sealing by airbag expansion can adapt to different sealing surface shapes and sizes. Even if the sealing surface has certain unevenness or minor defects, effective sealing can be achieved through the elastic deformation of the airbag, greatly improving the reliability of the seal. The annular pressure-bearing seat 202 and the annular limiting seat 203 protect and restrict the annular expansion bladder 204. During the inflation of the annular expansion bladder 204, the annular pressure-bearing seat 202 and the annular limiting seat 203 work together to limit the expansion range of the annular expansion bladder 204, causing it to expand laterally and fit against the outer ring seat 103, thus limiting the expansion direction and ensuring a sealing effect. By inflating and deflating the annular expansion bladder 204, the opening and closing of the medium passage can be conveniently and flexibly controlled. This control method has a fast response speed and can adjust the valve's working state in a timely manner according to actual needs, achieving rapid pressure balance and medium flow control, thereby improving the valve's operating performance.

[0034] Furthermore, under high pressure, when the annular expansion bladder 204 blocks the outer ring seat 103, after the pressure relief control valve 8 is opened, the high-pressure medium in the high-pressure side chamber flows into the pressure balance chamber through the pressure relief pipe 7. As the pressure inside the pressure balance chamber increases, the high-pressure medium further compresses the annular expansion bladder 204, making it fit more tightly with the outer ring seat 103, thereby automatically enhancing the sealing effect. This adaptive sealing enhancement is naturally generated under high pressure and does not require additional control or operation, ensuring the pressure relief balance effect of the valve under high pressure.

[0035] Example 4: like Figures 1-11As shown, the annular limiting seat 203 is located between the annular pressure bearing seat 202 and the inner ring seat 101; multiple open sliding grooves are evenly arranged around the outer surface of the annular limiting seat 203, and multiple limiting slide plates 205 are slidably connected in the multiple open sliding grooves. Each of the multiple limiting slide plates 205 has a limiting baffle 206 fixedly connected to its outer end. The multiple limiting baffles 206 are engaged with the outer side of the multiple annular expansion airbags 204; multiple limiting slots 104 are opened on the inner side of the outer ring seat 103 near the valve plate 4, which are one-to-one with the multiple limiting baffles 206; after the annular expansion airbags 204 are inflated, they can push and drive the multiple limiting baffles 206 to move in the direction of the multiple limiting slots 104. When the multiple limiting baffles 206 are engaged in the multiple limiting slots 104, the annular expansion airbags 204 are in contact with the side of the outer ring seat 103 near the valve plate 4. Each of the multiple limiting slots 104 is fixedly equipped with a positioning sensor. When the multiple limiting baffles 206 are inserted into the multiple limiting slots 104 one by one, they press against the positioning sensors that cooperate with them, thereby detecting the position status of the multiple limiting baffles 206. Each limiting baffle 206 is fixedly connected to the annular limiting seat 203 with a return spring 208. After the annular expansion airbag 204 is inflated, it causes the limiting baffle 206 to stretch the return spring 208. After the annular expansion airbag 204 is deflated, the limiting baffle 206 returns to the axis of the annular limiting seat 203 under the elastic force of the return spring 208. A limiting block is fixed on the limiting slide plate 205, and the limiting block slides in the limiting groove on the side of the annular limiting seat 203. Each limiting baffle 206 is fixed with an auxiliary stop rod 209 at one end near the annular bearing seat 202. The inner end of the auxiliary stop rod 209 slides in the auxiliary groove on the outer ring surface of the annular bearing seat 202.

[0036] The working principle and technical effects of the above scheme are as follows: In a high-pressure resistant, rapidly openable and closeable flat valve of the present invention, an annular limiting seat 203 is located between an annular pressure bearing seat 202 and an inner annular seat 101. Multiple open grooves are evenly distributed around its outer surface, and multiple limiting slide plates 205 slide within these open grooves. When the annular expansion airbag 204 inflates, it presses against and drives multiple limiting baffles 206 towards multiple limiting slots 104. The limiting slide plates 205 slide along the open grooves, providing guidance for the movement of the limiting baffles 206. The cooperation between the open grooves and the limiting slide plates 205 ensures that the limiting baffles 206 can move accurately in a predetermined direction, avoiding deviation and wobbling during movement. This allows the limiting baffles 206 to accurately engage within the limiting slots 104, ensuring the stability and reliability of the entire structure. The multiple evenly distributed limiting baffles 206 can evenly distribute the pressure generated by the expansion of the annular expansion airbag 204 onto the outer annular seat 103, preventing damage caused by excessive local pressure and extending the service life of the components. The inner side of the outer ring seat 103 near the valve plate 4 has multiple limiting slots 104 that correspond one-to-one with the multiple limiting baffles 206. Position sensors are fixedly installed in each of the multiple limiting slots 104. When the multiple limiting baffles 206 are inserted into the multiple limiting slots 104, they press against the corresponding position sensors. The position sensors detect the position status of the limiting baffles 206 and send corresponding signals. The position sensors can monitor in real time whether the limiting baffles 206 are accurately engaged in the limiting slots 104, thereby indirectly reflecting whether the annular expansion bladder 204 has reached the expected expansion and sealing state. Through the feedback signals, operators can promptly understand the valve's operating status, facilitating fault diagnosis and maintenance. A return spring 208 is fixedly connected between each limiting baffle 206 and the annular limiting seat 203. After the annular expansion bladder 204 inflates, it causes the limiting baffle 206 to stretch the return spring 208. When the annular expansion bladder 204 deflates, the limiting baffle 206 returns to its original position towards the axis of the annular limiting seat 203 under the elastic force of the return spring 208. The return spring 208 enables the limiting baffle 206 to automatically return to its original position after the annular expansion bladder 204 deflates, without manual intervention. This ensures that the valve can return to its initial state after multiple uses, preparing it for the next operation and improving the efficiency and convenience of valve use. A limiting block is fixed on the limiting slide plate 205, and the limiting block slides in the limiting groove on the side of the annular limiting seat 203 to prevent the limiting slide plate 205 from detaching from the annular limiting seat 203. Each limiting baffle 206 has an auxiliary stop rod 209 fixed at one end near the annular pressure seat 202. The inner end of the auxiliary stop rod 209 slides in the auxiliary groove on the outer ring surface of the annular pressure seat 202. The above structure further restricts the movement trajectory of the limiting baffle 206.The auxiliary stop 209, the limiting baffle 206, and the limiting slide plate 205 work together to constrain the expansion direction of the annular inflatable airbag 204 from multiple directions, ensuring that it expands toward a preset position. This also prevents unnecessary shaking and tilting of the limiting baffle 206 during movement, ensuring that the limiting baffle 206 can accurately engage with the limiting slot 104. The end of the limiting baffle 206 near the limiting slot 104 also has a rounded or chamfered corner, thereby improving its insertion efficiency into the limiting slot 104.

[0037] In this invention, when the annular expansion airbag 204 inflates and presses against the limiting baffle 206, which engages with the limiting groove 104, not only is the position of the annular expansion airbag 204 restricted and locked, but the sealing effect between the annular expansion airbag 204 and the outer ring seat 103 is further enhanced. As the pressure increases, the fit between the limiting baffle 206 and the limiting groove 104 becomes tighter, making the continued expansion of the annular expansion airbag 204 and its contact with the outer ring seat 103 more secure, thus enhancing the sealing performance and reliability of the annular expansion airbag 204 during sealing. The annular expansion airbag 204 is made of high-pressure resistant rubber material, has a stable structure, and will not easily burst under high pressure.

[0038] Furthermore, the positioning sensor in this invention can not only monitor whether the limiting baffle 206 is in position (the positioning sensor can be a commonly available pressure sensor), but also determine whether there is a fault in the entire structure by analyzing the sensor signal. For example, if a positioning sensor fails to detect the positioning signal of the limiting baffle 206, it may indicate problems such as abnormal expansion of the annular expansion bladder 204 or obstruction of movement of the limiting baffle 206. This fault warning function can promptly detect potential safety hazards, providing additional protection for the safe operation of the valve.

[0039] Example 5: like Figures 1-11 As shown, multiple inflation / deflation tubes 210 are uniformly and fixedly connected around the inner ring surface of the annular inflation bladder 204. These tubes are sealed and fixed within multiple air holes on the outer side of the central shaft 201, and these air holes communicate with an inflation / deflation chamber 211 located inside the central shaft 201. One end of the inflation / deflation chamber 211 is fixedly connected to an L-shaped air tube 212, which is located on the side of the central shaft 201 away from the valve plate 4. The other end of the L-shaped air tube 212 extends through a through-hole in the side wall of the valve body 1 to the outside of the valve body 1, and the through-hole is sealed and fixedly connected to the L-shaped air tube 212. A conical diverter head 213 is provided on the side of the annular pressure seat 202 near the valve plate 4.

[0040] The working principle and technical effects of the above scheme are as follows: In a high-pressure resistant, rapidly openable and closeable flat valve of the present invention, the inflation and deflation of the annular expansion bladder 204 are achieved through a gas path system integrated inside the central shaft 201. Specifically, multiple inflation / deflation pipes 210 are uniformly and fixedly arranged around the inner annular surface of the annular expansion bladder 204 and sealed to the air holes on the surface of the central shaft 201. These air holes ultimately converge into the inflation / deflation chamber 211 inside the central shaft 201. The inflation / deflation chamber 211, as an integrated gas distribution chamber, is connected to the gas source control system outside the valve body 1 through an L-shaped air pipe 212. The L-shaped air pipe 212 passes through a through-hole in the side wall of the valve body 1 and is sealed and fixed there, ensuring the sealing integrity of the valve body.

[0041] This invention utilizes multiple inflation / deflation pipes 210 to simultaneously supply or depress air to the annular expansion bladder 204 from the inner ring surface, enabling it to expand or contract rapidly and uniformly. This multi-channel air supply avoids problems such as localized bulging, deformation, or delayed response that can occur with single-point air supply, ensuring that the annular expansion bladder 204 can quickly and smoothly seal the outer ring seat 103, improving the reliability and speed of the sealing action. Furthermore, this invention integrates the main air path inside the central shaft 201, avoiding the need for complex external hoses within the high-pressure chamber, greatly reducing the risk of failure due to pipe entanglement, wear, and fatigue. The L-shaped air pipe 212 leads the control interface to the outside of the valve body 1, allowing for easy interface with an external pneumatic control system to control the inflation / deflation of the annular expansion bladder 204, enabling automated or remote valve control, while also facilitating routine inspection and maintenance.

[0042] In this invention, the conical diverter head 213 is fixedly installed on the side of the annular pressure bearing seat 202 near the valve plate 4. When the valve is opened, and the medium flows from the high-pressure side to the low-pressure side and through the medium passage of the plug assembly 100, the conical diverter head 213 faces the incoming flow direction. Its conical structure can effectively divert the medium, guiding it to smoothly bypass itself and pass through the medium passage formed by the support beam 102, thereby significantly reducing local flow resistance and turbulence. This not only reduces the pressure loss of the valve and improves the flow capacity, but also reduces vibration and noise caused by eddies and impacts.

[0043] Furthermore, when the high-pressure medium flows out at high speed, that is, after the annular expansion bladder 204 deflates and contracts, the conical diverter head 213 provides a protective buffer for the annular expansion bladder 204, annular limiting seat 203 and other components behind it. It directly bears the main impact of the fluid, avoiding the frontal impact of the high-pressure medium and damage to the relatively fragile annular expansion bladder 204, which greatly extends the service life of the bladder and improves the durability of the entire balance plug mechanism under harsh working conditions.

[0044] Example 6: like Figures 1-11As shown, the central shaft 201 is slidably connected in the central hole of the inner ring seat 101, and the protrusion fixed in the central hole of the inner ring seat 101 is slidably fitted in the guide groove on the outer side of the central shaft 201; the annular limiting seat 203 is connected to the inner ring seat 101 by a buffer spring 207 sleeved on the central shaft 201; the L-shaped air tube 212 is a telescopic hose.

[0045] The working principle and technical effects of the above scheme are as follows: In a high-pressure resistant, rapidly openable and closeable flat valve of the present invention, the central shaft 201 is not rigidly locked to the inner ring seat 101, but rather is slidably connected within its central hole, allowing the central shaft 201 to slide slightly along its axial direction along with the entire airbag plug assembly 200. Simultaneously, the protrusion fixed within the central hole of the inner ring seat 101 engages with a guide groove on the outer surface of the central shaft 201, restricting relative rotation of the central shaft 201 while allowing axial sliding. Allowing axial sliding of the central shaft 201 enables the airbag plug assembly 200 to undergo slight positional adaptation during inflation and sealing, based on actual contact conditions, ensuring optimal contact between the annular expansion airbag 204 and the end face of the outer ring seat 103. A buffer spring 207, sleeved on the central shaft 201, is installed between the annular limiting seat 203 and the inner ring seat 101. The buffer spring 207 provides elastic support for the entire sliding airbag plug assembly 200. When the valve suddenly opens or closes, or when pressure fluctuations occur in the piping system, the valve plate 4 may impact the airbag plug assembly 200. The buffer spring 207 can absorb and buffer these impact energies, preventing rigid collisions from causing deformation or damage to components such as the central shaft 201 and the annular bearing seat 202.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A high-pressure resistant, quick-opening and closing flat plate valve, characterized in that, include: The valve body comprises a first valve seat and a second valve seat disposed within the medium passage of the valve body, a valve plate that is slidably disposed between the first valve seat and the second valve seat, a valve stem that is drivenly connected to the valve plate, and a handwheel drive mechanism that drives the valve stem. The valve body is provided with a pressure relief pipe, the two ends of which are respectively connected to the high-pressure side chamber of the first valve seat facing away from the valve plate and the low-pressure side chamber of the second valve seat facing away from the valve plate. A pressure relief control valve is provided on the pressure relief pipe for controlling the opening and closing of the pressure relief pipe.

2. The high-pressure resistant, quick-opening and closing flat valve according to claim 1, characterized in that, Also includes: The balancing plug mechanism includes: a plug seat assembly fixedly installed in the low-pressure side chamber, with an airbag plug assembly connected to the side of the plug seat assembly near the valve plate; when the airbag plug assembly is inflated, it can seal the medium passage of the plug seat assembly, forming a pressure balance chamber between the valve plate and the plug seat assembly, and the pressure balance chamber is connected to the pressure relief pipeline; after deflating, the airbag plug assembly can release the blockage of the medium passage of the plug seat assembly, allowing the medium to flow out through the medium passage of the plug seat assembly.

3. A high-pressure resistant, quick-opening and closing flat valve according to claim 2, characterized in that, The plug assembly includes: an inner ring seat for connecting the airbag plug assembly, the outer side of the inner ring seat being connected to an outer ring seat fixedly connected to the inner wall of the low-pressure side chamber by multiple evenly arranged support beams, and a medium passage is formed between the inner ring seat and the outer ring seat.

4. A high-pressure resistant, quick-opening and closing flat valve according to claim 3, characterized in that, The airbag plug assembly includes: a central shaft connected to the inner ring seat, an annular pressure bearing seat and an annular limiting seat fixedly connected to one end of the central shaft near the valve plate, an annular expansion airbag sleeved on the central shaft located between the annular pressure bearing seat and the annular limiting seat, and the annular expansion airbag can seal the side of the outer ring seat near the valve plate after inflation.

5. A high-pressure resistant, quick-opening and closing flat valve according to claim 4, characterized in that, The annular limiting seat is located between the annular pressure bearing seat and the inner ring seat. Multiple open sliding grooves are evenly arranged around the outer surface of the annular limiting seat. Multiple limiting slide plates are slidably connected in the multiple open sliding grooves. Each of the multiple limiting slide plates has a limiting baffle fixedly connected to its outer end. The multiple limiting baffles are engaged with the outer side of the multiple annular expansion airbags. Multiple limiting slots are opened on the inner side of the outer ring seat near the valve plate, which are one-to-one with the multiple limiting baffles. After the annular expansion airbag is inflated, it can push and drive the multiple limiting baffles to move in the direction of the multiple limiting slots. When the multiple limiting baffles are engaged in the multiple limiting slots, the annular expansion airbag is in contact with the side of the outer ring seat near the valve plate.

6. A high-pressure resistant, quick-opening and closing flat valve according to claim 5, characterized in that, Each limiting baffle is fixedly connected to the annular limiting seat with a return spring. After the annular expansion airbag is inflated, it causes the limiting baffle to stretch the return spring. After the annular expansion airbag is deflated, the limiting baffle returns to the axis of the annular limiting seat under the elastic force of the return spring.

7. A high-pressure resistant, quick-opening and closing flat valve according to claim 6, characterized in that, A limiting block is fixed on the limiting slide, and the limiting block slides in the limiting groove on the side of the annular limiting seat.

8. A high-pressure resistant, quick-opening and closing flat valve according to claim 6, characterized in that, Each limiting baffle is fixed with an auxiliary baffle at one end near the annular bearing seat, and the inner end of the auxiliary baffle slides in the auxiliary groove on the outer ring surface of the annular bearing seat.

9. A high-pressure resistant, quick-opening and closing flat valve according to claim 6, characterized in that, Multiple inflation and deflation tubes are evenly and fixedly connected around the inner ring surface of the annular inflation bladder. These tubes are sealed and fixed within multiple air holes on the outer side of the central shaft. These air holes communicate with the inflation and deflation chamber located inside the central shaft. The inflation and deflation chamber is fixedly connected to one end of an L-shaped air tube, which is located on the side of the central shaft away from the valve plate. The other end of the L-shaped air tube extends through a through-hole in the side wall of the valve body to the outside of the valve body. The through-hole and the L-shaped air tube are sealed and fixedly connected.

10. A high-pressure resistant, quick-opening and closing flat valve according to claim 9, characterized in that, A tapered flow divider is installed on the side of the annular pressure seat near the valve plate.

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