Large-flow safety valve

Abstract

The embodiment of the invention provides a high-flow safety valve which comprises a valve body with two through ends, a liquid inlet is formed in the first end of the valve body, a valve seat is arranged on the inner side of the first end of the valve body, a plug used for introducing gas into the valve body is arranged at the second end of the valve body, a movable valve element is arranged in the valve body, and the valve element is arranged in the valve body. High-pressure gas used for adjusting movement of the valve element is filled between the valve element and the plug, a liquid drainage hole is formed in the side face of the valve body, and the liquid drainage hole is opened or closed through movement of the valve element. According to the embodiment of the invention, liquid feeding and discharging adjustment under the large-flow working condition can be achieved, high-pressure gas is used for replacing an elastic element, the conical surface sealing position of the valve port can be evenly stressed, the conditions that a traditional spring is large in spring machining difficulty in use, and the spring is subjected to fatigue fracture after multiple times of opening can be avoided, and the service life of the spring is prolonged. Therefore, the safety and the reliability of a hydraulic system using the safety valve are improved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of valve devices, and in particular to a large flow safety valve. Background Art

[0002] The safety valve is an overpressure protection device in the hydraulic system. When the pressure before the valve exceeds the preset opening pressure of the safety valve, the safety valve opens to release the pressure, thereby reducing the pressure in the hydraulic system. Figure 1 As shown, the safety valve comprises a valve body 30, in which a movable valve core 20 is arranged, and the end of the valve core 20 is connected to a spring 10, and the opening pressure of the valve core 20 is controlled by adjusting the preload force of the spring 10. When the pressure of the liquid inlet of the valve body 30 reaches a predetermined opening pressure, the valve core 20 is pushed by the pressure of the liquid inlet to open and release the pressure, and the liquid is discharged to the atmosphere through the liquid discharge hole of the valve body 30.

[0003] However, the current large flow safety valve has the following technical disadvantages:

[0004] One is that the increment of the pre-valve pressure is high in the fully open state. Specifically, when the pressure of the safety valve inlet is constant, the flow rate of the safety valve is mainly determined by the opening of the valve core, that is, the larger the opening of the valve core, the greater the flow rate through the safety valve. However, since the opening power of the valve core is completely provided by the inlet pressure, during the opening process of the valve core, the inlet pressure needs to have a certain increment from the overflow of the valve core opening to the full opening of the valve core to meet the nominal flow requirements. If the pressure is too high when fully opened, it will increase the hydraulic pressure on the safety valve and the hydraulic system where the safety valve is located, which is not conducive to the safety of the hydraulic system.

[0005] Figure 1 The existing safety valve shown is fully open before the valve core 20 is opened, and has no throttling and pressure-maintaining effect. Therefore, when the valve core 20 is opened and overflowed, the high-pressure liquid reaches the chamber 30A of the valve body 30, and the pressure is close to the atmospheric pressure and basically drops to zero. Therefore, during the opening process of the valve core 20, the effective area pushed by the high-pressure liquid is the same as the channel area of ​​the valve seat position of the valve body 30, and the effective area is small and significantly smaller than the matching diameter of the valve core 3 and the valve body 30. At the same time, the opening driving force of the valve core 20 is the product of the pressure of the high-pressure liquid and the effective area of ​​the high-pressure liquid, so a higher inlet liquid pressure is required to increase the valve core opening, thereby increasing the safety valve flow. Therefore, the overshoot pressure of the safety valve is increased, which is not conducive to the safety of the hydraulic system.

[0006] The second is that the conical seal of the valve port is subjected to uneven spring pressure, and the seal is unreliable. Specifically, for example Figure 1After the spring 10 is compressed and deformed, it will not only generate axial elastic force on the valve core 20, but also radial torsional force on the valve core 20, so that the force on the conical surface sealing position of the valve port is uneven. When the valve core 20 is opened and closed many times under high pressure and large flow conditions, the conical surface seal will wear due to uneven force, reducing the sealing reliability.

[0007] The third is that the spring processing is difficult and the service life is short. Specifically, the channel sealing diameter of the large flow safety valve is generally large, which requires a large spring preload, making the spring processing difficult. At the same time, the spring wire is subjected to great stress during operation, which reduces the durability of the spring. Summary of the invention

[0008] In order to solve the problems existing in the prior art such as high increment of pre-valve pressure in the fully open state, uneven spring pressure on the conical surface seal of the valve port, difficulty in spring processing and short life, etc., the present disclosure provides a large flow safety valve.

[0009] In view of this, an embodiment of the present disclosure provides a large-flow safety valve, including a valve body with two through-going ends, a liquid inlet is arranged at the first end of the valve body, a valve seat is arranged on the inner side of the first end of the valve body, a plug is arranged at the second end of the valve body for introducing gas into the valve body, a movable valve core is arranged in the valve body, high-pressure gas for regulating the movement of the valve core is filled between the valve core and the plug, a drainage hole is arranged on the side of the valve body, and the drainage hole is opened or closed by moving the valve core.

[0010] In some embodiments, the plug includes a partition portion, a first recess is provided on a first side of the partition portion close to the valve seat, an inflatable push rod is provided in the first recess, a through hole connecting the first recess and an external air source is provided on the partition portion, and the inflatable push rod can move in the first recess along the extension direction of the valve body.

[0011] In some embodiments, the inflation ejector includes a main body and an air inlet portion, the outer diameter of the main body is larger than the outer diameter of the air inlet portion and larger than the inner diameter of the gas cavity of the valve body, and the axial length of the main body is smaller than the depth of the first recess.

[0012] In some embodiments, a first air inlet channel and a second air inlet channel are arranged at the end of the air inlet portion, the first air inlet channel is consistent with the extension direction of the valve body, one end of the first air inlet channel is arranged on the end surface of the air inlet portion, and the other end thereof is connected to one end of the second air inlet channel, the second air inlet channel is perpendicular to the extension direction of the valve body, and the other end of the second air inlet channel is arranged on the side of the air inlet portion and can be closed by the inner surface of the through hole.

[0013] In some embodiments, an air intake seal is arranged between the end surface of the main body and the surface of the partition portion, and a sealed cavity is formed between the end surface of the main body and the surface of the partition portion. A third air intake channel is arranged on the main body, and an extension direction of the third air intake channel is consistent with an extension direction of the valve body. One end of the third air intake channel is connected to the sealed cavity, and the other end thereof is arranged on the end surface of the main body and is connected to the gas cavity of the valve body.

[0014] In some embodiments, a blocking cap is further included, a second recess is provided on a second side of the partition portion away from the valve seat, and the blocking cap is disposed in the second recess.

[0015] In some embodiments, the diameter of the valve core matched with the valve body is larger than the outer diameter of the liquid inlet channel of the valve seat.

[0016] In some embodiments, a spring is disposed in the gas cavity of the valve body to increase the elastic force driving the valve core to move.

[0017] In some embodiments, the valve core moves between the valve seat and the inflation ejector rod, and the contact surface between the valve core and the valve seat is a conical surface or a rounded surface.

[0018] In some embodiments, the valve seat includes a first part close to the liquid inlet and a second part away from the liquid inlet, the outer diameter of the first part is larger than the outer diameter of the second part, a first step is arranged on the inner surface of the first end of the valve body, the valve seat is positioned by abutting and matching the first part and the first step, a threaded connection is adopted between the outer surface of the first part and the inner surface of the valve body, a valve seat seal is arranged between the outer surface of the second part and the inner surface of the valve body; a second step for limiting the position of the plug is arranged on the inner surface of the valve body.

[0019] The disclosed embodiment can achieve the regulation of liquid inlet and outlet under large flow conditions, and uses high-pressure gas instead of elastic elements, so that the conical sealing position of the valve port can be evenly stressed. It can also avoid the problem of difficult spring processing and spring fatigue fracture after multiple openings during use of traditional springs, thereby improving the safety and reliability of the hydraulic system used by the safety valve.

[0020] In order to make the above-mentioned objectives, features and advantages of the embodiments of the present disclosure more obvious and understandable, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0022] Figure 1 It is a structural diagram of an existing large flow safety valve;

[0023] Figure 2 It is a structural schematic diagram of a large flow safety valve in an embodiment provided in the embodiment of the present disclosure;

[0024] Figure 3 It is a partial structural schematic diagram of a large flow safety valve in an embodiment provided in the embodiment of the present disclosure.

[0025] Among them, the above-mentioned Figure 2 and Figure 3 The following reference numerals are included:

[0026] 1-valve seat; 11-first part; 12-second part; 2-valve body; 2a-first end; 2b-second end; 21-flow channel through hole; 22-liquid inlet; 23-first step; 24-valve seat seal; 25-drain hole; 26-second step; 3-valve core; 4-inflatable push rod; 41-main body; 411-third air inlet channel; 42-air inlet part; 421-first air inlet channel; 422-second air inlet channel; 5-plug; 51-partition; 52-first recess; 53-second recess; 54-through hole; 55-inlet seal; 56-sealing chamber; 6-plug cap. DETAILED DESCRIPTION

[0027] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0028] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0030] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0031] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0032] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0033] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0035] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0036] The disclosed embodiment provides a large flow safety valve, which can solve the technical problems of the existing large flow safety valve, such as excessively high opening pressure, unreliable cone seal and poor spring durability, thereby improving the safety and reliability of the hydraulic system used by the safety valve. Figure 2 and Figure 3 As shown, the large-flow safety valve includes a valve body 2, and the valve body 2 has a flow channel through hole 21. The valve body 2 is based on the flow channel through hole 21 to form a through structure with openings at both ends. The first end 2a of the valve body 2 is a liquid inlet 22, and a valve seat 1 is arranged on the inner side of the first end 2a of the valve body 2, and external liquid enters the valve seat 1 through the liquid inlet 22.

[0037] Preferably, the valve seat 1 comprises a first portion 11 close to the liquid inlet 21 and a second portion 12 away from the liquid inlet 11, the outer diameter of the first portion 11 is greater than the outer diameter of the second portion 12, and in order to match the structure of the valve seat 1, a first step 23 is provided on the inner surface of the first end of the valve body 2, and the valve seat 1 is clamped and positioned to be arranged at a position inside the first end 2a of the valve body 2 through the abutment and cooperation between the first portion 11 of the valve seat 1 and the first step 23. Here, the outer surface of the first portion 11 and the inner surface of the valve body 2 are preferably connected by threads, and a valve seat seal 24 is provided between the outer surface of the second portion 12 and the inner surface of the valve body 2 to achieve sealing between the valve seat 1 and the valve body 2.

[0038] Further, a movable valve core 3 is provided in the valve body 2, and a liquid discharge hole 25 is provided on the side of the valve body 2. The valve core 3 can reciprocate in the valve body 2 along the extension direction of the flow through hole 21 and open or close the liquid discharge hole 25 during the movement. The diameter of the valve core 3 matched with the valve body 2 is larger than the outer diameter of the liquid inlet channel of the valve seat 1.

[0039] Here, the contact surface between the valve core 3 and the end of the valve seat 1 is conical, and a conical seal is formed between the end of the valve seat 1 and the contact surface of the valve core 3 to form a cavity A. The valve core 3 moves especially between the end of the valve seat 1 and the second end 2b of the valve body 2. Of course, the contact surface can also be a rounded surface or other shapes suitable for sealing.

[0040] Further, a plug 5 is provided at the second end 2b of the valve body 2, and the plug 5 can be connected to the valve body 2 by a fastener, for example. The plug 5 is used to seal the second end 2b of the valve body 2 after high-pressure gas is introduced into the valve body 2. A gas cavity is formed between the valve core 3 and the plug 5 to fill the high-pressure gas used to adjust the movement of the valve core 3. A plug cap 6 is provided on the side of the plug 5 away from the valve seat 1, and the plug cap 6 is connected to the plug 5 by a thread, for example. When the valve body 2 is filled with high-pressure gas, the valve body 2 can be completely sealed by the plug cap 6 to ensure the high-pressure environment in the valve body 2. When it is necessary to increase or release pressure, for example, the plug cap 6 can be removed from the plug 5.

[0041] Furthermore, a second step 26 is provided on the inner surface of the valve body 2 , and the second step 26 is used to limit the position of the plug 5 so that the plug 5 is fixed to the second end 2 b of the valve body 2 .

[0042] Specifically, when external liquid enters the valve seat 1 through the liquid inlet 22, the pressure of the liquid can push the valve core 3 to move in the direction away from the valve seat 1 to open the drainage hole 25. The pressure of the high-pressure gas filled between the valve core 3 and the plug 5 can also push the valve core 3 to move in the direction close to the valve seat 1 to close the drainage hole 25. In this way, the drainage hole 25 can be opened or closed by moving the valve core 3.

[0043] The outer surface of the valve core 3 in this embodiment is tightly fitted with the inner surface of the valve seat 1, thereby achieving a sealing effect. Of course, a valve core seal can also be provided to achieve sealing. In addition, the contact position between the valve core 3 and the drainage hole 25 of the valve body 2 is a clearance fit structure.

[0044] Furthermore, an inflatable push rod 4 is provided on the first side of the plug 5 close to the valve seat 1, and the inflatable push rod 4 here is used to assist in pressurizing or depressurizing the valve body 2. For example, when performing a pressurizing operation, after the plug cap 6 is removed, when an external gas source passes high-pressure gas into the gas cavity of the valve body 2 through the plug 5, the inflatable push rod 4 is first driven to move toward the valve seat 1, and the external gas source is connected to the gas cavity of the valve body 2 through the movement of the inflatable push rod 4, so that the gas cavity can be pressurized, which can ensure a high-pressure environment in the gas cavity without leakage. For example, when performing a depressurizing operation, after the plug cap 6 is removed, the movement of the inflatable push rod 4 is controlled by an external device so that the high-pressure gas in the gas cavity flows out from the plug 5.

[0045] Furthermore, in order to realize the arrangement of the inflation push rod 4 on one side of the plug 5, the plug 5 includes a partition 51, a first recess 52 is arranged on the first side of the partition 51 close to the valve seat 1, and a second recess 53 is arranged on the second side of the partition 51 away from the valve seat 1, the inflation push rod 4 is arranged in the first recess 52, the nut 6 is arranged in the second recess 53, and a through hole 54 is arranged on the partition 51, and the through hole 54 can connect the first recess 52 and the second recess 53, and the inflation push rod 4 can reciprocate in the first recess 52 along the extension direction of the valve body 2.

[0046] Specifically, the inflatable top rod 4 includes a main body 41 and an air inlet 42, the outer diameter of the main body 41 is larger than the outer diameter of the air inlet 42, the outer diameter of the main body 41 matches the inner diameter of the first recess 51, and the outer diameter of the air inlet 42 matches the inner diameter of the through hole 53, so that the main body 41 is arranged in the first recess 52, and the air inlet 42 passes through the through hole 53 and extends into the second recess 53.

[0047] Furthermore, the outer diameter of the main body 41 is greater than the inner diameter of the flow channel through hole 11, and the axial length of the main body 41 is less than the depth of the first recess 52, so that the inflation ejector rod 4 can not only be confined in the first recess 52 but also can reciprocate in the first recess 52.

[0048] A first air intake channel 421 and a second air intake channel 422 are provided at the end of the air intake portion 42, the first air intake channel 421 is consistent with the extension direction of the valve body 2, one end of the first air intake channel 421 is provided on the end face of the air intake portion 42, and the other end thereof is connected to one end of the second air intake channel 422, the second air intake channel 422 is perpendicular to the extension direction of the valve body 2, the other end of the second air intake channel 422 is provided on the side of the air intake portion 42, and can be closed by the inner surface of the through hole 54.

[0049] Furthermore, an air intake seal 55 is provided between the end surface of the main body 41 and the surface of the partition 51, and a sealing cavity 56 is formed between the end surface of the main body 41 and the surface of the partition 51, so that the gas cavity of the valve body 2 is isolated from the external gas source.

[0050] Furthermore, a third air inlet channel 411 is provided on the main body 41, and an extension direction of the third air inlet channel 411 is consistent with an extension direction of the valve body 2, one end of the third air inlet channel 411 is connected to the sealing cavity 56, and the other end thereof is provided on the end surface of the main body 41 and is connected to the gas cavity of the valve body 2.

[0051] When using this embodiment, first open the blocking cap 6 so that the high-pressure gas provided by the external gas source can enter the air inlet portion 42 of the inflation push rod 4 through the blocking cap 5, and by pushing the air inlet portion 42 toward the valve seat 1, the second air inlet channel 422 is no longer closed, but is connected with the sealing cavity 56. In this way, the high-pressure gas enters the second air inlet channel 422 from the first air inlet channel 421, and then enters the third air inlet channel 411 through the sealing cavity 56, and finally enters the gas cavity of the valve body 2, so that the gas cavity is filled with high-pressure gas, and finally the blocking cap 6 is installed.

[0052] When external liquid enters the valve seat 1 through the liquid inlet 22, the liquid inlet pressure is greater than the opening pressure of the valve core 3, thereby pushing the valve core 3 to move away from the valve seat 1; when the drainage hole 25 is fully opened by the movement of the valve core 3, the pressure in the gas chamber will continue to increase, and the valve core 3 will move to a position close to the inflation push rod 4. When the liquid inlet pressure becomes smaller, the high pressure in the gas chamber drives the valve core 3 in the reverse direction toward the valve seat 1, thereby gradually closing the drainage hole 25.

[0053] In the above process, high-pressure gas is used to replace the elastic element, so that the conical sealing position of the valve port is evenly stressed, and the spring is prevented from generating radial torsional force on the valve core 3, thereby improving the reliability of the valve port seal. In addition, the use of high-pressure gas to replace the elastic element can also avoid the problem of difficult spring processing and spring fatigue fracture after multiple openings in the use of traditional springs.

[0054] Of course, under the premise of using high-pressure gas, a spring can also be arranged in the gas chamber of the valve body 2. By arranging the spring to increase the elastic force of the valve core 3, the movement of the valve core 3 is made faster.

[0055] Based on the fact that this embodiment can achieve the regulation of large flow of liquid inlet and outlet, when the valve core 3 is in the closed state, the liquid discharge hole 25 on the valve body 2 is blocked by the valve core 3 and closed; when the valve core 3 is gradually opened under the action of the liquid inlet pressure from the liquid inlet hole 22, the liquid inlet pressure is greater than the opening pressure of the valve core 3, thereby pushing the valve core 3 to move in the direction away from the valve seat 1, so that the liquid discharge hole 25 on the valve body 2 is gradually opened. Compared with directly fully opening the liquid discharge hole 25, the gradual opening of the liquid discharge hole 25 on the valve body 2 has a throttling and pressure-maintaining effect. To this end, when the high-pressure liquid flows through the valve seat 1 and reaches the position of the cavity A in the valve body 2, the liquid pressure from the liquid inlet 22 increases the opening driving force of the valve core 3, thereby increasing the opening of the valve core 3, which can significantly increase the liquid flow through the large-flow safety valve. When pressure relief is required, it is only necessary to open the plug cap 6 to relieve the pressure of the high-pressure gas in the gas chamber through the cooperation of the plug 5 and the inflation push rod 4.

[0056] The disclosed embodiment can achieve the regulation of liquid inlet and outlet under large flow conditions, and uses high-pressure gas instead of elastic elements, so that the conical sealing position of the valve port can be evenly stressed. It can also avoid the problem of difficult spring processing and spring fatigue fracture after multiple openings during use of traditional springs, thereby improving the safety and reliability of the hydraulic system used by the safety valve.

[0057] In the above embodiments of the present disclosure, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0059] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present disclosure.

[0060] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0061] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A large flow safety valve, characterized in that: It comprises a valve body with two ends through which a liquid inlet is arranged at the first end of the valve body, a valve seat is arranged on the inner side of the first end of the valve body, a plug is arranged at the second end of the valve body for introducing gas into the valve body, a movable valve core is arranged in the valve body, a space between the valve core and the plug is filled with high-pressure gas for regulating the movement of the valve core, a drainage hole is arranged on the side of the valve body, and the drainage hole is opened or closed by the movement of the valve core.

2. The large flow safety valve according to claim 1, characterized in that: The plug includes a partition, a first recess is arranged on a first side of the partition close to the valve seat, an inflatable push rod is arranged in the first recess, a through hole connecting the first recess and an external air source is arranged on the partition, and the inflatable push rod can move in the first recess along the extension direction of the valve body.

3. The large flow safety valve according to claim 2, characterized in that: The inflation ejector includes a main body and an air inlet. The outer diameter of the main body is larger than the outer diameter of the air inlet and larger than the inner diameter of the gas cavity of the valve body. The axial length of the main body is smaller than the depth of the first recess.

4. The large flow safety valve according to claim 3, characterized in that: A first air intake channel and a second air intake channel are arranged at the end of the air intake portion, the first air intake channel is consistent with the extension direction of the valve body, one end of the first air intake channel is arranged on the end surface of the air intake portion, and the other end of the first air intake channel is connected to one end of the second air intake channel, the second air intake channel is perpendicular to the extension direction of the valve body, and the other end of the second air intake channel is arranged on the side of the air intake portion and can be closed by the inner surface of the through hole.

5. The large flow safety valve according to claim 4, characterized in that: An air intake seal is arranged between the end face of the main body and the surface of the partition, and a sealed cavity is formed between the end face of the main body and the surface of the partition. A third air intake channel is arranged on the main body, and an extension direction of the third air intake channel is consistent with an extension direction of the valve body. One end of the third air intake channel is connected to the sealed cavity, and the other end of the third air intake channel is arranged on the end face of the main body and connected to the gas cavity of the valve body.

6. The large flow safety valve according to claim 2, characterized in that: A blocking cap is also included. A second recess is provided on a second side of the partition away from the valve seat, and the blocking cap is provided in the second recess.

7. The large flow safety valve according to claim 1, characterized in that: The diameter of the valve core matched with the valve body is larger than the outer diameter of the liquid inlet passage of the valve seat.

8. The large flow safety valve according to claim 1, characterized in that: A spring is arranged in the gas cavity of the valve body to increase the elastic force driving the valve core to move.

9. The large flow safety valve according to claim 1, characterized in that: The valve core moves between the valve seat and the plug, and the contact surface between the valve core and the valve seat is a conical surface or a rounded surface.

10. The large flow safety valve according to claim 1, characterized in that: The valve seat includes a first part close to the liquid inlet and a second part away from the liquid inlet, the outer diameter of the first part is larger than the outer diameter of the second part, a first step is arranged on the inner surface of the first end of the valve body, the valve seat is positioned by abutting and matching the first part and the first step, a threaded connection is adopted between the outer surface of the first part and the inner surface of the valve body, a valve seat seal is arranged between the outer surface of the second part and the inner surface of the valve body; a second step for limiting the position of the plug is arranged on the inner surface of the valve body.

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