A liquid pipeline pressure exhaust valve

Abstract

The present invention discloses a liquid pipeline pressure exhaust valve, comprising a valve body and a fixed support, wherein the valve body has an upper liquid accumulation cavity and a lower liquid accumulation cavity, a transition cavity is formed between the upper liquid accumulation cavity and the lower liquid accumulation cavity, an exhaust cavity is provided at the top of the upper liquid accumulation cavity, and a liquid inlet cavity is provided at the bottom of the lower liquid accumulation cavity; a through hole is provided in the fixed support, and the valve body is sealedly connected to the fixed support through the through hole in the fixed support via the liquid inlet cavity; a float and an exhaust rod are provided in the lower liquid accumulation cavity, the exhaust rod is connected to the float, and a pressing rod extending to the outside of the exhaust cavity is provided in the exhaust cavity, and the pressing rod is connected to the exhaust rod. The exhaust valve of the present invention has a simple structure, is easy to operate, is light in weight, has a low cost, is easy to disassemble and replace, can accurately grasp the working condition of the pipeline, can meet the transportation requirements of the aircraft fuel system, has strong practicality, and has a good application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust equipment in pipeline transportation systems, in particular to a pressure exhaust valve for a liquid pipeline. Background Art

[0002] Aircraft environmental control, hydraulic, and fuel systems involve various piping systems, such as the hydraulic, oxygen, and fuel systems. The fuel system, in particular, requires transporting oil from the tank to the engine for operation. These systems typically involve long, long-distance pipelines. Due to the uneven nature of the pipeline installation, a certain amount of air can accumulate within the pipes during initial transport. During long-distance transport, a booster pump is required to ensure proper fluid flow. Furthermore, in everyday fluid pipelines, such as central heating and air conditioning systems, irrigation systems, and oil transfer systems, air can accumulate within the pipes during the transport process. When this air accumulates to a certain level, it generates significant pressure. This air pressure can damage equipment or prevent the proper flow of the liquid within the pipes. Therefore, it is crucial to promptly remove this accumulated air to ensure proper fluid flow within the piping system.

[0003] An exhaust valve is a device used to release air, primarily used to exhaust pipes in independent heating systems, central heating systems, heating boilers, central air conditioning, floor heating, and solar heating systems. Because water typically contains a certain amount of dissolved air, and its solubility decreases with increasing temperature, gas gradually separates from the water during circulation and gathers to form large bubbles or even columns. Due to the constant replenishment of water, gas is often generated. Currently, the more commonly used exhaust valves come in various configurations, including heating, micro-volume, rapid, and composite types. The main problems with existing exhaust valves used in liquid pipelines are: first, the installation process is complex and cumbersome; second, it is difficult to accurately monitor the pipeline's operating conditions; and third, they are difficult to disassemble and replace after installation. Therefore, to meet the transportation needs of aircraft fuel systems, a simple exhaust valve with convenient installation and operation is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the problems existing in the background technology, thereby providing a valve with a simple structure and easy operation. It is applied in the pipeline to facilitate the timely discharge of gas accumulated in the pipeline, thereby meeting the use requirements. Specifically, it is a liquid pipeline pressure exhaust valve.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a liquid pipeline pressure exhaust valve, including a valve body and a fixed support, the fixed support is installed on the pipe in the pipeline, the valve body has an upper liquid accumulation cavity and a lower liquid accumulation cavity, a transition cavity is formed between the upper liquid accumulation cavity and the lower liquid accumulation cavity, and an exhaust cavity communicating with its inner cavity is provided at the top of the upper liquid accumulation cavity, and a liquid inlet cavity communicating with its inner cavity is provided at the bottom of the lower liquid accumulation cavity. The valve body is connected to the exhaust cavity, the upper liquid accumulation cavity, the transition cavity, the lower liquid accumulation cavity, and the like through the exhaust cavity, the upper liquid accumulation cavity, the transition cavity, and the lower liquid accumulation cavity. The liquid cavity and the liquid inlet cavity are connected in sequence from top to bottom to form an integrated cavity structure with an inner cavity; a through hole corresponding to the liquid inlet cavity is provided in the fixed support, and the valve body is sealedly connected to the fixed support through the liquid inlet cavity through the through hole in the fixed support, and the liquid inlet end of the liquid inlet cavity extends into the pipe in the pipeline; a float and an exhaust rod for sealing the transition cavity are provided in the lower liquid accumulation cavity, the exhaust rod is connected to the float, and a pressing rod extending to the outside of the exhaust cavity is provided in the exhaust cavity, and the pressing rod is connected to the exhaust rod.

[0006] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, wherein the exhaust cavity has a accommodating space and an exhaust channel communicating with the outside, and a first through hole communicating with the upper liquid accumulation cavity is provided at the bottom of the accommodating space; the pressing rod includes a pressing sealing part, a pressing connecting rod and a limiting sealing part, and the pressing sealing part and the limiting sealing part form an integrated structure through the pressing connecting rod, wherein the limiting sealing part is located in the accommodating space in the exhaust cavity, the pressing connecting rod is located in the exhaust channel in the exhaust cavity, and the pressing sealing part is located outside the exhaust cavity, and the exhaust channel contacts or separates from the outlet end of the exhaust channel through the pressing sealing part, or the limiting sealing part contacts or separates from the inlet end of the exhaust channel, forming a closed or conductive state.

[0007] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, wherein the pressing sealing portion in the pressing rod is configured as a hemispherical curved surface structure, the pressing connecting rod is configured as a cylindrical structure corresponding to the exhaust channel, and the limiting sealing portion is configured as a conical structure; wherein the length of the pressing connecting rod is greater than the height of the exhaust channel.

[0008] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, wherein the transition chamber has a closed channel and a second through hole communicating with the upper liquid accumulation chamber, the exhaust rod is used to close or guide the closed channel in the transition chamber, a first connecting rod is installed on the top of the exhaust rod, and a second connecting rod is installed on the bottom thereof, the upper end of the exhaust rod is fixedly connected to the limiting sealing portion in the pressing rod through the first connecting rod through the first through hole; the lower end of the exhaust rod is fixedly connected to the float located in the lower liquid accumulation chamber through the second connecting rod; wherein a spring is also mounted on the first connecting rod, the spring is located in the accommodating space in the exhaust chamber, the upper end of the spring is in abutment and contact with the limiting sealing portion in the pressing rod, and the lower end of the spring is in abutment and contact with the bottom of the accommodating space in the exhaust chamber.

[0009] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, wherein the exhaust rod includes an upper sealing part, a sealing connecting rod and a lower sealing part, and the upper sealing part and the lower sealing part are integrated into a structure through the sealing connecting rod, wherein the upper sealing part is located in the upper liquid accumulation cavity, and the lower sealing part is located in the lower liquid accumulation cavity, the lower end of the sealing connecting rod is fixedly connected to the lower sealing part, and the upper end thereof passes through the second through hole and is fixedly connected to the upper sealing part, and the closed channel in the transition cavity is contacted or separated by the upper sealing part and the second through hole, or the lower sealing part is contacted or separated from the inlet end of the closed channel, to form a closed or conductive state; wherein the upper sealing part in the exhaust rod is set to a spherical cap curved surface structure, the sealing connecting rod is a cylindrical structure corresponding to the second through hole, and the lower sealing part is set to a conical structure; wherein the length of the sealing connecting rod is greater than the height of the closed channel

[0010] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, wherein the upper liquid accumulation cavity in the valve body is configured as a spherical cap curved surface structure, while the lower liquid accumulation cavity is configured as a conical structure, the transition cavity and the liquid inlet cavity are both configured as cylindrical structures, and the exhaust cavity is configured as a stepped cylindrical structure.

[0011] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, in which a ball valve is also installed in the liquid inlet cavity in the valve body. The ball valve is arranged in the liquid inlet cavity close to the side of the lower liquid accumulation cavity. The liquid inlet cavity is in an open or closed state through the ball valve, so as to be in a conductive or closed state with the pipe in the pipeline.

[0012] Furthermore, the present invention discloses a liquid pipeline pressure exhaust valve, wherein a display screen is provided on the outer side of the lower liquid accumulation chamber in the valve body, and a temperature sensor and a pressure sensor for detecting temperature and pressure are provided within the inner cavity of the lower liquid accumulation chamber, each of which is electrically connected to the display screen. The temperature sensor and pressure sensor provided in the lower liquid accumulation chamber can detect and reflect the temperature and pressure within the lower liquid accumulation chamber. When the pressure is too high, the pressing rod can be manually operated to drive the exhaust rod 5 to move, thereby manually exhausting the gas, eliminating safety hazards and preventing safety accidents.

[0013] The working principle of an exhaust valve is as follows: when gas escapes from a system, it rises through the pipes and eventually gathers at the highest point in the system. Exhaust valves are typically installed at this point. When gas enters the valve chamber, it gathers above the valve. As the gas volume increases, the pressure rises. When the gas pressure exceeds the system pressure, the gas causes the water level in the chamber to drop, causing the float to descend with the water level, opening the exhaust port. Once the gas is exhausted, the water level rises, and the float rises with it, closing the exhaust port. Similarly, when negative pressure develops in the system, the water level in the valve chamber drops, opening the exhaust port. Since the outside atmospheric pressure is now greater than the system pressure, atmospheric air can enter the system through the exhaust port, preventing the harmful effects of negative pressure. Tightening the valve cap on the exhaust valve body will stop the exhaust valve from venting. Under normal circumstances, the valve cap should remain open.

[0014] The liquid pipeline pressure exhaust valve described in the present invention has the following advantages over the prior art: utilizing the working principle of the exhaust valve, through the interconnected pressing rod, exhaust rod, and float, gas accumulated in the pipeline can be promptly discharged through the valve body, ensuring the normal operation of the pipeline. The provided ball valve can realize automatic and manual exhaust functions. In addition, since it is also equipped with a temperature sensor and a pressure sensor for detecting temperature and pressure, it can effectively eliminate the safety hazard of excessive pressure. The exhaust valve described in the present invention has a simple structure, is easy to operate, is lightweight, low in cost, and is easy to disassemble and replace. It can also accurately monitor the working status of the pipeline, can meet the transportation needs of aircraft fuel systems, has strong practicality, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in further detail below with reference to the accompanying drawings.

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] As shown in the figure: 1-pressing rod, 2-spring, 3-valve body, 4-upper liquid accumulation cavity, 5-exhaust rod, 6-float, 7-display screen, 8-lower liquid accumulation cavity, 9-ball valve, 10-fixed support. DETAILED DESCRIPTION

[0018] like Figure 1 As shown, a liquid pipeline pressure exhaust valve described in the present invention includes a pressing rod 1, a spring 2, a valve body 3, an exhaust rod 5, a float 6 and a fixed support 10; the fixed support 10 is located at the bottom of the exhaust valve as a supporting component, and is used to be installed and fixed on the pipe in the pipeline, the valve body 3 has an upper liquid accumulation cavity 4 and a lower liquid accumulation cavity 8, a transition cavity is formed between the upper liquid accumulation cavity 4 and the lower liquid accumulation cavity 8, and an exhaust cavity is provided at the top of the upper liquid accumulation cavity 4 and communicated with its inner cavity, and a liquid inlet cavity is provided at the bottom of the lower liquid accumulation cavity 8 and communicated with its inner cavity, the valve body 3 is connected to the upper liquid accumulation cavity 4, the transition cavity and the lower liquid accumulation cavity through the exhaust cavity, the upper liquid accumulation cavity 4, the transition cavity and the lower liquid accumulation cavity. 8 and the liquid inlet cavity are connected in sequence from top to bottom to form an integrated cavity structure with an inner cavity; a through hole corresponding to the liquid inlet cavity is provided in the fixed support 10, and the valve body 3 is sealedly connected to the fixed support 10 through the through hole in the fixed support 10 through the liquid inlet cavity, and the liquid inlet end of the liquid inlet cavity extends into the pipe in the pipeline to form a liquid inlet channel; a float 6 and an exhaust rod 5 for blocking the transition cavity are provided in the lower liquid accumulation cavity 8, the float (6) serves as a sphere for sensing the movement of the liquid surface, the exhaust rod 5 is connected to the float 6, and a pressing rod 1 extending to the outside of the exhaust cavity is provided in the exhaust cavity, and the pressing rod 1 is connected to the exhaust rod 5. The upper liquid accumulation cavity 4 in the valve body 3 is set as a spherical cap curved surface structure, and the lower liquid accumulation cavity 8 is set as a cone structure, the transition cavity and the liquid inlet cavity are both set as cylindrical structures, and the exhaust cavity is set as a stepped cylindrical structure.

[0019] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, wherein the exhaust cavity has a accommodating space and an exhaust channel communicating with the outside, and a first through hole communicating with the upper liquid accumulation cavity 4 is provided at the bottom of the accommodating space; the pressing rod 1 includes a pressing sealing part, a pressing connecting rod and a limiting sealing part, and the pressing sealing part and the limiting sealing part form an integrated structure through the pressing connecting rod, wherein the limiting sealing part is located in the accommodating space in the exhaust cavity, the pressing connecting rod is located in the exhaust channel in the exhaust cavity, and the pressing sealing part is located outside the exhaust cavity, and the exhaust channel contacts or separates with the outlet end of the exhaust channel through the pressing sealing part, or the limiting sealing part contacts or separates with the inlet end of the exhaust channel to form a closed or conductive state; wherein the pressing sealing part in the pressing rod 1 is set to a hemispherical curved surface structure, the pressing connecting rod is set to a cylindrical structure corresponding to the exhaust channel, and the limiting sealing part is set to a conical structure; wherein the length of the pressing connecting rod is greater than the height of the exhaust channel.

[0020] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, wherein the transition chamber has a closed channel and a second through hole communicating with the upper liquid accumulation chamber 4, the exhaust rod 5 is used to close or guide the closed channel in the transition chamber, a first connecting rod is installed on the top of the exhaust rod 5, and a second connecting rod is installed at the bottom thereof, the upper end of the exhaust rod 5 is fixedly connected to the limiting sealing portion in the pressing rod 1 through the first connecting rod through the first through hole; the lower end of the exhaust rod 5 is fixedly connected to the float 6 located in the lower liquid accumulation chamber 8 through the second connecting rod; wherein a spring 2 is also mounted on the first connecting rod, the spring 2 is located in the accommodating space in the exhaust chamber, the upper end of the spring 2 is in abutment and contact with the limiting sealing portion in the pressing rod 1, and the lower end of the spring 2 is in abutment and contact with the bottom of the accommodating space in the exhaust chamber.

[0021] Furthermore, the present invention describes a liquid pipeline pressure exhaust valve, wherein the exhaust rod 5 includes an upper sealing portion, a sealing connecting rod and a lower sealing portion, wherein the upper sealing portion and the lower sealing portion are integrated into a structure via the sealing connecting rod, wherein the upper sealing portion is located in the upper liquid accumulation cavity 4, and the lower sealing portion is located in the lower liquid accumulation cavity 8, the lower end of the sealing connecting rod is fixedly connected to the lower sealing portion, and the upper end thereof is fixedly connected to the upper sealing portion through the second through hole, and the closed channel in the transition cavity is contacted or separated with the second through hole through the upper sealing portion, or the lower sealing portion is contacted or separated with the inlet end of the closed channel, thereby forming a closed or conductive state. In addition, in order to improve the sealing effect of the entire exhaust valve, the upper sealing portion in the exhaust rod 5 is configured as a spherical cap curved surface structure, the sealing connecting rod is a columnar structure corresponding to the second through hole, and the lower sealing portion is configured as a conical structure; wherein the length of the sealing connecting rod is greater than the height of the closed channel.

[0022] Furthermore, to facilitate the exhaust operation of the exhaust valve, a ball valve 9 is also installed in the liquid inlet cavity of the valve body 3. The ball valve 9 is arranged in the liquid inlet cavity near the side of the lower liquid accumulation cavity 8. The liquid inlet cavity is opened or closed by the ball valve 9, thereby achieving a conductive or closed state with the pipeline in the pipeline. It can be seen that the ball valve 9 installed in the liquid inlet cavity forms a seal to open and close the liquid inlet cavity, thereby controlling the working state of the entire exhaust valve.

[0023] Furthermore, to provide visibility into the status of liquid delivery in the pipeline and achieve automatic monitoring, a display screen 7 is provided on the exterior of the lower fluid chamber 8 within the valve body 3. A temperature sensor and a pressure sensor for detecting temperature and pressure are also provided within the interior of the lower fluid chamber 8. These temperature and pressure sensors are electrically connected to the display screen 7. The temperature and pressure sensors within the lower fluid chamber 8 can detect and reflect the temperature and pressure within the chamber. When the pressure is too high, manually operating the pressure lever 1 drives the exhaust lever 5 to move, thereby manually exhausting the gas, eliminating potential safety hazards and preventing accidents.

[0024] The exhaust valve of the present invention operates as follows: first, the fixed support 10 is fixed to the pipe in the pipeline according to the exhaust and detection requirements. Then, the exhaust valve is installed as required. Under the action of its own weight and the float 6, the exhaust rod 5 pulls the pressing rod 1 through the exhaust rod 5, blocking the transition cavity between the upper and lower fluid accumulation cavities, making it contact with the closed channel in the transition cavity, thereby closing the entire exhaust valve. During the downward movement of the pressing rod 1, the spring 2 is compressed, thereby connecting the upper fluid accumulation cavity with the outside world, achieving the purpose of exhaust.

[0025] When the liquid in the pipeline is flowing, the ball valve 9 is opened, and the liquid and gas in the pipeline will enter the lower liquid accumulation cavity 4 through the liquid inlet cavity. During the rising process, the liquid in the lower liquid accumulation cavity 4 rises under the action of buoyancy using the float 6, pushing the exhaust rod 5 to rise, thereby opening the closed channel, and the gas and part of the liquid enter the upper liquid accumulation cavity 4. Under the action of pressure, the gas rises with the pressing rod 1 and is discharged through the exhaust channel in the exhaust cavity.

[0026] When the exhaust rod 5 rises to a certain extent, all the gas enters the upper liquid accumulation cavity, and finally the exhaust rod 5 is used to close the closed channel, and the liquid no longer rises. At the same time, the exhaust rod 5 blocks the exhaust channel in the exhaust cavity under the joint action of the pressing rod 1 and the spring 2, and the gas no longer flows out. At the same time, it also ensures that the liquid will not flow out of the valve body 3.

[0027] When the liquid drops, the exhaust rod 5 drops synchronously with the liquid under the action of its own gravity and the float 6, thereby opening the closed channel, and the liquid in the upper liquid accumulation cavity 4 automatically flows back to the lower liquid accumulation cavity 8. At the same time, the pressing rod 1 drops synchronously with the exhaust rod 5, so that the exhaust channel in the exhaust cavity is also opened at the same time, and the gas will continue to be discharged from the valve body 3 under the action of pressure.

[0028] Thus, by repeating this process, the gas is automatically discharged while preventing liquid leakage. When the pressure on the display 7 is too high, it indicates that the exhaust valve is clogged or the pressure in the pipeline is too high. In this case, the push rod 1 can be manually pressed to open the exhaust channel and discharge the gas. This allows for timely maintenance of the exhaust valve or cessation of liquid flow in the pipeline, preventing safety accidents.

[0029] By installing a ball valve 9 within the liquid inlet chamber, it functions to open and close the liquid inlet chamber, thereby controlling the overall operating state of the exhaust valve. When the exhaust valve is no longer required or when the pipeline is no longer flowing with liquid, the ball valve 9 can be closed. Furthermore, the ball valve 9 also needs to be closed when inspecting the exhaust valve. The fixed support 10 is used to secure the exhaust valve to the pipe in the pipeline to be vented. A threaded connection or a clamp connection can be used, as long as a secure connection is achieved to form a sealed structure. Furthermore, a display screen 7 is provided, and a temperature sensor and a pressure sensor for detecting temperature and pressure are also provided within the inner cavity of the lower liquid accumulation chamber 8. These temperature sensors and pressure sensors are electrically connected to the display screen 7. The temperature and pressure sensors can promptly detect and reflect the temperature and pressure within the lower liquid accumulation chamber 8. The temperature sensor, pressure sensor, and display screen 7 are all common devices in the prior art. Their application in the present invention is intended to facilitate control, not to improve the devices themselves. Therefore, no detailed description is provided, as long as they meet the requirements of use.

[0030] It can be seen that by setting the pressing rod 1, exhaust rod 5 and float 6 to be connected to each other as a whole, the gas accumulated in the pipeline can be discharged in time through the valve body 3 to ensure the normal operation of the pipeline, and the ball valve 9 is set, the functions of automatic exhaust and manual exhaust can be realized. In addition, since a temperature sensor and a pressure sensor for detecting temperature and pressure are also provided, the safety hazard of excessive pressure can be effectively eliminated.

[0031] In summary, the exhaust valve described in the present invention has a simple structure, is easy to operate, is light in weight, low in cost, is easy to disassemble and replace, and can accurately grasp the working conditions of the pipeline. It can meet the transportation needs of the aircraft fuel system, is highly practical, and has good application prospects.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various changes and variations may be made. Any modifications, equivalent replacements, improvements, etc. made using the present invention should be included in the scope of protection of the present invention.

Claims

1. A liquid pipeline pressure exhaust valve, characterized by: The invention comprises a valve body (3) and a fixed support (10), wherein the fixed support (10) is installed on a pipe in a pipeline, the valve body (3) has an upper liquid accumulation cavity (4) and a lower liquid accumulation cavity (8), a transition cavity is formed between the upper liquid accumulation cavity (4) and the lower liquid accumulation cavity (8), and an exhaust cavity communicating with the inner cavity of the upper liquid accumulation cavity (4) is provided at the top, and a liquid inlet cavity communicating with the inner cavity of the lower liquid accumulation cavity (8) is provided at the bottom, and the valve body (3) is connected in sequence from top to bottom through the exhaust cavity, the upper liquid accumulation cavity (4), the transition cavity, the lower liquid accumulation cavity (8) and the liquid inlet cavity. The invention relates to a one-piece cavity structure having an inner cavity; a through hole corresponding to the liquid inlet cavity is provided in the fixed support (10); the valve body (3) is sealedly connected to the fixed support (10) through the through hole in the fixed support (10) via the liquid inlet cavity; the liquid inlet end of the liquid inlet cavity extends into the pipe in the pipeline; a float (6) and an exhaust rod (5) for sealing the transition cavity are provided in the lower liquid accumulation cavity (8); the exhaust rod (5) is connected to the float (6); and a pressing rod (1) extending to the outside of the exhaust cavity is provided in the exhaust cavity, and the pressing rod (1) is connected to the exhaust rod (5); The exhaust cavity has a accommodating space and an exhaust passage communicating with the outside, and a first through hole communicating with the upper liquid accumulation cavity (4) is provided at the bottom of the accommodating space; the pressing rod (1) includes a pressing sealing portion, a pressing connecting rod and a limiting sealing portion, and the pressing sealing portion and the limiting sealing portion form an integrated structure through the pressing connecting rod, wherein the limiting sealing portion is located in the accommodating space in the exhaust cavity, the pressing connecting rod is located in the exhaust passage in the exhaust cavity, and the pressing sealing portion is located outside the exhaust cavity, and the exhaust passage contacts or separates with the outlet end of the exhaust passage through the pressing sealing portion, or the limiting sealing portion contacts or separates with the inlet end of the exhaust passage, thereby forming a closed or open state; The transition cavity has a closed passage and a second through hole communicating with the upper liquid accumulation cavity (4); the exhaust rod (5) is used to close or guide the closed passage in the transition cavity; a first connecting rod is installed on the top of the exhaust rod (5), and a second connecting rod is installed on the bottom of the exhaust rod (5); the upper end of the exhaust rod (5) is fixedly connected to the limiting sealing portion in the pressing rod (1) through the first connecting rod passing through the first through hole; the lower end of the exhaust rod (5) is fixedly connected to the float (6) located in the lower liquid accumulation cavity (8) through the second connecting rod; A spring (2) is also mounted on the first connecting rod. The spring (2) is located in the accommodation space in the exhaust cavity, with its upper end abutting and contacting with the limiting sealing portion in the pressing rod (1), and its lower end abutting and contacting with the bottom of the accommodation space in the exhaust cavity. The exhaust rod (5) includes an upper blocking portion, a blocking connecting rod and a lower blocking portion, wherein the upper blocking portion and the lower blocking portion form an integrated structure through the blocking connecting rod, wherein the upper blocking portion is located in the upper liquid accumulation cavity (4), and the lower blocking portion is located in the lower liquid accumulation cavity (8), the lower end of the blocking connecting rod is fixedly connected to the lower blocking portion, and the upper end thereof is fixedly connected to the upper blocking portion through the second through hole, and the closed channel in the transition cavity is contacted or separated with the second through hole through the upper blocking portion, or the lower blocking portion is contacted or separated with the inlet end of the closed channel, thereby forming a closed or conductive state.

2. A liquid pipeline pressure exhaust valve according to claim 1, characterized in that: The pressing sealing portion in the pressing rod (1) is configured as a hemispherical curved surface structure, the pressing connecting rod is configured as a columnar structure corresponding to the exhaust channel, and the limiting sealing portion is configured as a cone structure; wherein the length of the pressing connecting rod is greater than the height of the exhaust channel.

3. The liquid pipeline pressure exhaust valve according to claim 1, characterized in that: The upper blocking portion in the exhaust rod (5) is configured as a spherical cap curved surface structure, the blocking connecting rod is a columnar structure corresponding to the second through hole, and the lower blocking portion is configured as a cone structure; wherein the length of the blocking connecting rod is greater than the height of the closed channel.

4. The liquid pipeline pressure exhaust valve according to claim 1, characterized in that: The upper liquid accumulation cavity (4) in the valve body (3) is configured as a spherical cap curved surface structure, while the lower liquid accumulation cavity (8) is configured as a cone structure. The transition cavity and the liquid inlet cavity are both configured as cylindrical structures, and the exhaust cavity is configured as a stepped cylindrical structure.

5. A liquid pipeline pressure exhaust valve according to any one of claims 1 to 4, characterized in that: A spherical valve (9) is also installed in the liquid inlet cavity of the valve body (3). The spherical valve (9) is arranged in the liquid inlet cavity on the side close to the lower liquid accumulation cavity (8). The liquid inlet cavity is in an open or closed state through the spherical valve (9), thereby achieving a conducting or closed state with the pipeline in the pipeline.

6. A liquid pipeline pressure exhaust valve according to claim 5, characterized in that: A display screen (7) is also provided on the outer side of the lower liquid accumulation cavity (8) in the valve body (3), and a temperature sensor and a pressure sensor for detecting temperature and pressure are also provided in the inner cavity of the lower liquid accumulation cavity (8), and the temperature sensor and the pressure sensor are electrically connected to the display screen (7) respectively.

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