A pressure sampling pressure loss valve structure and a gas shut-off valve

Abstract

This utility model discloses a pressure sampling pressure loss valve structure, including a valve body with an inlet and an outlet. The passage of the valve body forms a pressure loss structure to create a pressure difference between the inlet and outlet of the valve body. Sampling mechanisms are installed on both sides of the pressure loss structure, and the sampling mechanisms are connected to sensor components, mainly gas pressure sensors. The gas shut-off valve including this valve structure is installed on a gas pipeline. By measuring the gas pressure difference between the inlet and outlet, the flow rate of the flowing gas can be interpreted. The accuracy and range of this interpretation are far superior to the original method of measurement by a single gas pressure sensor. By adjusting the pressure loss structure, it can adapt to different accuracy requirements of the pressure sensor.

Description

Technical Field

[0001] This utility model relates to the field of gas solenoid valve technology, and in particular to a pressure sampling pressure loss valve structure and a gas shut-off valve that provides more accurate pressure measurement. Background Technology

[0002] To ensure the safe use of gas, people install gas concentration detectors indoors and connect emergency shut-off valves to gas pipelines. When the gas concentration detector detects that the indoor gas concentration exceeds the set value, it will issue an alarm and control the emergency shut-off valve to close immediately to prevent gas from continuing to leak out.

[0003] A gas shut-off valve is an electromagnetic shut-off valve with a self-learning function installed after a gas meter. It monitors the pressure and temperature of the gas pipeline at the installation location through temperature and pressure sensors. When the pressure and temperature exceed the set threshold and change threshold, it uploads the information.

[0004] For example, application number 2023206724726 discloses a gas shut-off valve with a self-closing function. The gas shut-off valve is connected to a gas pipeline and includes a valve body and an actuator mounted on the valve body. A gas pressure sensing mechanism is also installed on the valve body and is electrically connected to the actuator. The gas pressure sensing mechanism includes a pressure chamber connected to the valve body, a pressure sensor disposed in the pressure chamber, and a connecting cable connecting the pressure sensor to the actuator. When gas passes through the valve body, it enters the pressure chamber. The pressure sensor measures the pressure and transmits the measured data to the actuator through the connecting cable. If the measured result shows overpressure or underpressure, the actuator performs an action to shut off the gas pipeline.

[0005] Its drawback is that the gas pressure sensing mechanism of the gas shut-off valve only has one pressure sensor. During detection, it can only detect the pressure value of the gas pipeline when there is gas and when there is no gas. Therefore, the accuracy requirement of the pressure sensor is high. The actuator on the upper part of the valve body is electrically connected to the gas pressure sensing mechanism. If it is not possible to guarantee that there is no gas leakage, the actuator on the upper part of the valve body should be replaced.

[0006] Therefore, those skilled in the art are dedicated to developing a pressure sampling pressure loss valve structure and a gas shut-off valve that can measure pressure more accurately. Utility Model Content

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is to develop a pressure sampling pressure loss valve structure and a gas shut-off valve that can be electrically and manually controlled to switch the solenoid valve.

[0008] To achieve the above objectives, this utility model provides a pressure sampling pressure loss valve structure, including a valve body with an inlet and an outlet. The passage of the valve body forms a pressure loss structure so that there is a pressure difference between the inlet and outlet of the valve body. Sampling mechanisms are respectively installed on both sides of the pressure loss structure, and the sampling mechanisms are connected to sensor components.

[0009] Furthermore, sampling holes for accommodating the sampling mechanism are respectively provided on both sides of the pressure loss structure on the valve body.

[0010] Furthermore, the pressure loss structure is a pressure loss channel formed by the passage of the valve body, and the pressure loss channel is vertically arranged on the passage of the valve body and has a variable diameter.

[0011] Furthermore, the pressure loss structure is composed of an integrated vertical connecting pipe and a horizontal connecting pipe. The top of the vertical connecting pipe is open and can communicate with the inlet, while the bottom of the vertical connecting pipe is sealed. One end of the horizontal connecting pipe is connected to one side of the vertical connecting pipe, and the other end extends into the outlet. The inner diameter of the vertical connecting pipe is smaller than the inner diameter of the inlet.

[0012] Furthermore, a recessed groove is provided at the top of the vertical connecting pipe, which is used to install an adjusting washer.

[0013] This utility model also provides a gas shut-off valve, including the pressure sampling and pressure loss valve structure described above, and further including a sealing assembly installed in the valve body; an actuator detachably installed on the upper part of the valve body, the handle of the sealing assembly extending from above the actuator; and a sensor assembly installed on the actuator.

[0014] Furthermore, the sampling mechanism includes a valve core installed in the sampling hole, a first sealing gasket, and a gas chamber opened by the actuator. The first sealing gasket is fixed to the end of the valve core near the actuator and is disposed between the gas chamber and the valve core. The first sealing gasket is used to ensure that gas flows from the sampling hole into the gas chamber and does not flow into the atmosphere. When the actuator is installed on the valve body, the valve core is normally open, and the gas chamber and the sampling hole are connected. When the actuator is removed from the valve body, the valve core is normally closed.

[0015] Furthermore, the valve core includes a first spring, a valve housing, a valve stem, and an O-ring fitted onto the valve housing. The valve housing is installed inside the sampling port, and the valve stem is disposed inside the valve housing along the axial direction. The end of the valve stem away from the actuator extends out of the valve housing. The first spring is also installed at the end of the valve stem near the actuator. Under the action of the first spring, the valve stem can drive the O-ring to seal with the sampling port.

[0016] Furthermore, the valve housing has external threads, and the valve housing is threadedly connected to the sampling hole of the valve body through the external threads.

[0017] Furthermore, a second sealing gasket is fitted on the end of the valve stem away from the actuator, and under the action of the first spring, the valve stem can drive the second sealing gasket to seal with the sampling hole.

[0018] The beneficial effects of this utility model are as follows: The pressure sampling and pressure loss valve structure of this utility model includes a valve body with an inlet and an outlet. The passage of the valve body forms a pressure loss structure so that there is a pressure difference between the inlet and outlet of the valve body. Sampling mechanisms are installed on both sides of the pressure loss structure. The sampling mechanisms are connected to a sensor assembly, which is mainly a gas pressure sensor. The valve including this valve structure is installed on a gas pipeline. By measuring the gas pressure difference between the inlet and outlet, the flow rate of the flowing gas can be interpreted. The accuracy and range of this interpretation are far superior to the original method of measurement by a single gas pressure sensor. By adjusting the pressure loss structure, it can adapt to different accuracy requirements of the pressure sensor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pressure sampling and pressure loss valve structure of this utility model;

[0020] Figure 2 This is a top view of the pressure sampling and pressure loss valve structure of this utility model;

[0021] Figure 3 yes Figure 2 Sectional view at point BB.

[0022] Figure 4 This is an exploded view of the gas shut-off valve of this utility model;

[0023] Figure 5 This is a top view of the gas shut-off valve of this utility model;

[0024] Figure 6 for Figure 5 Sectional view at point AA;

[0025] Figure 7 This is another cross-sectional view of the gas shut-off valve of this utility model;

[0026] Figure 8 This is a front view (exploded view) of the gas shut-off valve of this utility model;

[0027] Figure 9 for Figure 8 Enlarged view at point B in the middle;

[0028] Figure 10 for Figure 8 Enlarged view of point C in the middle.

[0029] The reference numerals in the attached figures are as follows:

[0030] Valve body 1, pressure loss structure 11, passage 12, sealing assembly 2, spindle 21, second spring 22, valve disc 23, permanent magnet 24, actuator 3, handle 31, sensor assembly 32, electromagnetic coil 33, housing 34, sampling hole 341, positioning post 342, positioning hole 343, protective cover 35, power cord 36, valve cover 37, cover seal 371, sampling mechanism 4, valve housing 41, valve stem 42, first sealing gasket 43, first spring 44, second sealing gasket 45, O-ring 46. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] like Figures 1 to 4 As shown, a pressure sampling and pressure loss valve structure includes a valve body 1 with an inlet 121 and an outlet 122. A pressure loss structure 11 is formed in the passage of the valve body 1 to create a pressure difference between the valve body inlet 121 and the outlet 122. Sampling mechanisms 4 are installed on both sides of the pressure loss structure 11, and the sampling mechanisms 4 are connected to sensor assemblies. A valve with this structure is installed on a gas pipeline. By measuring the gas pressure difference between the inlet and outlet, the flow rate of the flowing gas can be determined. The accuracy and range of this determination are far superior to the original method using a single gas pressure sensor. By adjusting the pressure loss structure, it can adapt to different accuracy requirements of the pressure sensor.

[0033] In this embodiment, sampling holes 341 for accommodating the sampling mechanism 4 are respectively provided on both sides of the pressure loss structure 11 on the valve body 1.

[0034] The pressure loss structure 11 is a pressure loss channel formed by the passage of the valve body. The pressure loss channel is vertically arranged on the valve body passage and has a variable diameter. Preferably, the pressure loss structure 11 consists of an integrated vertical connecting pipe 111 and a horizontal connecting pipe 112. The top of the vertical connecting pipe 111 is open and can communicate with the inlet, while the bottom of the vertical connecting pipe 111 is sealed. One end of the horizontal connecting pipe 112 is connected to one side of the vertical connecting pipe 111, and the other end extends into the outlet. The inner diameter of the vertical connecting pipe 111 is smaller than the inner diameter of the inlet, resulting in a simple structure.

[0035] The top of the vertical connecting pipe 111 is also provided with a recess 113, which is used to install adjusting washers, and different pressure losses are generated by washers with different orifice diameters.

[0036] like Figures 1 to 10 As shown, this embodiment also provides a gas shut-off valve, including the pressure sampling and pressure loss valve structure described above, and further including a sealing assembly 2 installed in the valve body 1; an actuator 3 detachably installed on the upper part of the valve body 1, the handle 31 of the sealing assembly 2 extending from above the actuator 3; and the sensor assembly installed on the actuator 3.

[0037] And, sampling mechanism 4, which is installed on the side of the valve body 1 near the actuator 3, the passage 12 of the valve body 1 forms a pressure loss structure 11 so that there is a pressure difference between the inlet and outlet of the valve body 1, there are two sampling mechanisms 4 and they are distributed on both sides of the pressure loss structure 11, and the other end of the sampling mechanism 4 cooperates with the sensor assembly 32 installed on the actuator 3.

[0038] According to a specific embodiment of this utility model, one end of the valve body 1 is a gas inlet, and the other end is a gas outlet. During installation, the passage 12 of the valve body 1 can be set horizontally or vertically. Alternatively, the actuator 3 can be installed below the valve body 1. The valve body 1 achieves sealing and blocks the gas flow through the sealing assembly 2, and the handle 31 of the sealing assembly 2 is set vertically to the passage 12. The sensor assembly 32 may specifically include a pressure sensor and a temperature sensor, as well as encapsulated structures, such as a gas chamber shell. The sensor assembly 32 is fixed to the bottom of the actuator 3.

[0039] The actuator 3 is detachably installed on the upper part of the valve body 1. The actuator 3 has a housing 34, and a power cord 36 is connected to one side of the housing 34. When the actuator 3 is removed, the sampling mechanism 4 is used to seal the gas inside the valve body 1, thereby preventing gas leakage from the valve body 1 and increasing the safety and convenience of replacement and maintenance of this utility model. When replacing the gas shut-off valve of this utility model, only the actuator 3 on the upper part of the valve body 1 needs to be replaced, without disassembling the entire gas shut-off valve, while ensuring no gas leakage. When the actuator 3 is installed on the upper part of the valve body 1, the sensor assembly 32 can act on the sampling mechanism 4 to allow gas to flow again.

[0040] This invention features a pressure loss structure 11 formed in the passage 12 of the valve body 1 to create a pressure difference between the inlet and outlet of the valve body 1. There are two sampling mechanisms 4 distributed on both sides of the pressure loss structure 11. By setting two sampling mechanisms 4 and two sensor components 32, the flow rate of the flowing gas can be interpreted. By adjusting the pressure loss structure 11, different accuracy requirements of the pressure sensor can be adapted.

[0041] Furthermore, the pressure loss structure 11 is a pressure loss channel formed by the passage 12 of the valve body 1. The pressure loss channel is arranged on the passage 12 of the valve body 1 and the pressure loss channel has a variable diameter structure.

[0042] According to a specific embodiment provided by this utility model, such as Figure 6 As shown, the pressure loss structure 11 is an integral part of the valve body 1. The pressure loss channel can be set on the passage 12 of the valve body 1. The angle of the pressure loss channel is not specifically limited here. Specifically, a groove can be opened at the top of the pressure loss channel. A pressure loss structure (waist) that changes the pressure loss value can be placed in the groove, so that the diameter of the pressure loss channel can be variable, and the pressure loss value can be adjusted.

[0043] Furthermore, the valve body 1 has two sampling holes 341, which are distributed at the inlet and outlet ends of the pressure loss structure 11. The sampling mechanism 4 includes a valve core installed in the sampling holes 341, a first sealing gasket 43, and a gas chamber opened by the actuator 3. The first sealing gasket 43 is fixed to the end of the valve core near the actuator 3 and is disposed between the gas chamber and the valve core. The first sealing gasket 43 is used to ensure that gas flows into the gas chamber from the sampling holes 341 and does not flow into the atmosphere. When the actuator 3 is installed on the valve body 1, the valve core is normally open, and the gas chamber and the sampling holes 341 are connected. When the actuator 3 is removed from the valve body 1, the valve core is normally closed.

[0044] According to a specific embodiment provided by the present utility model, sampling holes 341 are opened on both sides of the pressure loss structure 11, and the sampling mechanism 4 is installed through the sampling holes 341. In this embodiment, the valve core adopts an existing structure, and the valve core is directly fixedly installed with the sampling holes 341, such as by interference fit or bonding. The first sealing gasket 43 is sleeved and fixed at one end of the valve core close to the actuator 3. The first sealing gasket 43 is arranged between the gas chamber and the valve core. When the actuator 3 is installed on the valve body 1, the sensor assembly 32 presses the first sealing gasket 43 so that gas flows into the gas chamber from the sampling holes 341 instead of flowing into the atmosphere. When the actuator 3 is installed on the valve body 1, the valve core is常开 (the description here seems incorrect, assuming it should be "常开" translated as "normally open"), the gas chamber and the sampling holes 341 are connected, and when the actuator 3 is detached from the valve body 1, the valve core is常闭 (assuming it should be "常闭" translated as "normally closed").

[0045] Further, as Figure 8 、 Figure 10 shown, the valve core includes a first spring 44, a valve housing 41, a valve stem 42, and an O-ring 46 sleeved on the valve housing 41. The valve housing 41 is installed in the sampling holes 341. The valve stem 42 is arranged in the valve housing 41 along the axial direction. One end of the valve stem 42 far from the actuator 3 extends out of the valve housing 41. The first spring 44 is also installed at one end of the valve stem 42 close to the actuator 3. Under the action of the first spring 44, the valve stem 42 can带动 (assuming it should be "带动" translated as "drive") the O-ring 46 to seal with the sampling holes 341.

[0046] The valve stem 42 can move along the axial direction of the valve housing 41. One end of the valve stem 42 close to the actuator 3 is the upper end. The first sealing gasket 43 is sleeved on the upper end of the valve stem 42. The first sealing gasket 43 can adopt a suitable thickness according to the actual situation. The first sealing gasket 43 has a structure with a "middle" shape in the longitudinal section. The O-ring 46 of the valve housing 41 contacts the inner wall of the sampling holes 341 to achieve sealing.

[0047] Further, the valve housing 41 has an external thread, and the valve housing 41 is threadedly connected to the sampling holes 341 of the valve body 1 through the external thread. This embodiment provides another fixing method for the valve housing 41 and the sampling holes 341. The valve housing 41 has an external thread, and internal threads are opened in the sampling holes 341 of the valve body 1. The valve housing 41 is threadedly connected to the sampling holes 341 of the valve body 1 through the external thread.

[0048] Furthermore, a second sealing gasket 45 is fitted onto the end of the valve stem 42 furthest from the actuator 3. Under the action of the first spring 44, the valve stem 42 can drive the second sealing gasket 45 to seal against the sampling hole 341. The elastic force of the first spring 44 drives the second sealing gasket 45 to move, and the second sealing gasket 45 contacts the inner wall of the sampling hole 341 to achieve a seal. The lower end of the valve stem 42 is fitted with and fixed to the second sealing gasket 45. The second sealing gasket 45 cooperates with the O-ring 46 to achieve the external sealing of the sampling mechanism 4.

[0049] Furthermore, such as Figure 9 As shown, the actuator 3 includes a housing 34 and electrical components installed within the housing 34. The electrical components may include a circuit board assembly. The housing 34 has a gas chamber corresponding to the sampling mechanism 4, located on the side of the housing 34 opposite to the valve body 1. The sensor assembly 32 is installed within the gas chamber and is electrically connected to the electrical components. A valve cover 37 is provided between the housing 34 and the valve body 1. The valve cover 37 has a hole corresponding to the sampling mechanism 4, allowing a first sealing gasket 43 to be located within the hole. After installation, the valve cover 37 presses the first sealing gasket 43 against the inner wall of the sampling hole 341, achieving a static seal between the valve cover 37 and the valve core. The valve cover 37 has a cylindrical channel at its center, with a sealing ring installed on the inner wall of the cylindrical channel for dynamic sealing. A cover seal 371 (sealing ring, annular sealing gasket, or annular corner gasket) is also installed at the lower part of the valve cover 37 to achieve a radial or planar static seal on the valve body 1.

[0050] Furthermore, such as Figure 6 and Figure 7 As shown, the sealing assembly 2 includes a spindle 21, a second spring 22 sleeved on the spindle 21, a valve disc 23, a permanent magnet 24, and a handle 31;

[0051] One end of the spindle 21 passes through the housing 34 and extends into the valve body 1. This end of the spindle 21 is connected to the valve disc 23, which is used to seal the passage 12 of the valve body 1. The end of the spindle 21 away from the valve disc 23 is coaxially fixed with the handle 31, and the other end of the handle 31 extends out of the housing 34.

[0052] The other end of the second spring 22 abuts against the inner wall of the housing 34. Under the action of the second spring 22, the valve disc 23 can seal the passage 12 of the valve body 1. The permanent magnet 24 is fixed inside the housing 34. Under the action of the permanent magnet 24, the spring resistance can be overcome, allowing the valve disc 23 to release the seal. The sealing ring on the inner wall of the cylindrical channel is fitted on the spindle 21 to achieve a dynamic seal on the valve cover 37.

[0053] According to a specific embodiment of the present invention, the spindle 21 of the present invention can move up and down or rotate along the hole opened in the housing 34 of the actuator 3. The second spring 22 is installed at one end of the spindle 21. One end of the second spring 22 abuts against the valve cover 37, and the other end of the second spring 22 abuts against the valve disc 23. The valve disc 23 is equipped with a sealing gasket. The valve disc 23 can adopt the existing structure, so that the spindle 21 can push the sealing gasket of the valve disc 23 to seal the passage 12 of the valve body 1 under the push of the second spring 22.

[0054] The permanent magnet 24 is fixed to the inner wall of the hole in the housing 34. Two permanent magnets 24 are used. Figure 7 As shown, permanent magnets 24 are symmetrically arranged on both sides of the spindle 21. The permanent magnets 24 are located above the second spring 22. When the end of the outer handle 31 of the housing 34 is pulled, it overcomes the resistance of the second spring 22. At the same time, the permanent magnets 24 attract the spindle 21 to fix its position, so that the valve disc 23 releases the seal of the passage 12 of the valve body 1.

[0055] Furthermore, an electromagnetic coil 33 is installed inside the housing 34. The electromagnetic coil 33 is electrically connected to a current forward and reverse rotation control circuit. The electromagnetic coil 33 is wound around the outside of the spindle 21 and is located above the permanent magnet 24, so that when the electromagnetic coil 33 is energized, it generates the same or opposite magnetic force as the permanent magnet 24, so that the valve disc 23 releases the seal or seals the passage 12 of the valve body 1.

[0056] To further improve the automation level of the gas shut-off valve of this utility model, an electromagnetic coil 33 is installed inside the housing 34 in this embodiment. When overpressure, underpressure, overtemperature, or overcurrent occurs, the electromagnetic coil 33 receives an external electrical signal, generates an instantaneous magnetic field force, quickly releases the permanent magnet 24 and releases the elastic force of the second spring 22, and the valve quickly closes and remains closed. The valve can be opened by manual or automatic control.

[0057] Furthermore, the housing 34 extends circumferentially to form an installation plane on the side near the valve body 1. A positioning post 342 is installed on the side of the housing 34 facing the valve body 1. The positioning post 342 is located at the bottom of the actuator 3 housing. The positioning post 342 corresponds to the positioning hole 343 opened on the valve body 1. At the same time, a through hole is also opened on the valve cover 37 corresponding to the positioning post 342. The installation plane is a rectangular structure and the four corners are fixed to the valve body 1 by fasteners. A protective cover 35 is also installed on the upper part of the housing 34. The protective cover 35 covers the upper part of the handle 31.

[0058] This design facilitates the disassembly and installation of the valve body 1 and the housing 34. The mounting plane is a rectangular structure and the four corners are fixed to the valve body 1 by fasteners. At this time, the sensor assembly 32 can overcome the resistance of the first spring 44, causing the valve stem 42 to drive the second sealing gasket 45 to release the seal.

[0059] In use, the valve body 1 and the housing 34 of the actuator 3 are connected and fixed by screws. After connection, the sensor assembly 32 will compress the first sealing gasket 43 downward and push the valve stem 42 downward to separate the second sealing gasket 45 from the bottom sealing surface of the housing 34. This allows the gas in the valve body 1 to come into contact with the sensor assembly 32 through the sampling hole 341, thereby collecting and outputting the pressure at the inlet and outlet of the pressure loss structure 11.

[0060] When it is necessary to replace the actuator 3, remove the screws and take off the actuator 3. Under the action of the spring force of the first spring 44, the second sealing gasket 45 cooperates with the bottom sealing surface of the housing 34 to seal and prevent gas leakage.

[0061] Finally, it should be noted that in the description of this utility model, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 utility model.

[0062] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure-sampling pressure-loss valve structure comprising a valve body (1) provided with an inlet (121) and an outlet (122), characterized in that: The passage of the valve body (1) is formed with a pressure loss structure (11) so that there is a pressure difference between the valve body inlet (121) and outlet (122). Sampling mechanisms (4) are installed on both sides of the pressure loss structure (11), and the sampling mechanisms (4) are connected to sensor components.

2. The pressure-sampling pressure-loss valve structure of claim 1, wherein: The valve body (1) is provided with sampling holes (341) on both sides of the pressure loss structure (11) to accommodate the sampling mechanism (4).

3. The pressure-sampling pressure-loss valve structure of claim 2, wherein: The pressure loss structure (11) is a pressure loss channel formed by the passage of the valve body. The pressure loss channel is vertically arranged on the passage of the valve body and the pressure loss channel has a variable diameter structure.

4. The pressure-sampling pressure-loss valve structure of claim 3, wherein: The pressure loss structure (11) is composed of an integrated vertical connecting pipe (111) and a horizontal connecting pipe (112). The top of the vertical connecting pipe (111) is open and can communicate with the inlet, and the bottom of the vertical connecting pipe (111) is sealed. One end of the horizontal connecting pipe (112) is connected to one side of the vertical connecting pipe (111), and the other end extends into the outlet. The inner diameter of the vertical connecting pipe (111) is smaller than the inner diameter of the inlet.

5. The pressure-sampling pressure-loss valve structure of claim 4, wherein: The top of the vertical connecting pipe (111) is also provided with a recess (113), which is used to install the adjusting washer.

6. A gas shutoff valve characterized by: The pressure sampling pressure loss valve structure according to any one of claims 2 to 5 further includes a sealing assembly installed in the valve body; an actuator detachably installed on the upper part of the valve body, the handle of the sealing assembly extending from above the actuator; and the sensor assembly installed on the actuator.

7. Gas shut-off valve according to claim 6, characterized in that The sampling mechanism includes a valve core installed in the sampling hole, a first sealing gasket, and a gas chamber opened by the actuator. The first sealing gasket is fixed to the end of the valve core near the actuator and is disposed between the gas chamber and the valve core. The first sealing gasket is used to ensure that gas flows from the sampling hole into the gas chamber and does not flow into the atmosphere. When the actuator is installed on the valve body, the valve core is normally open, and the gas chamber and the sampling hole are connected. When the actuator is removed from the valve body, the valve core is normally closed.

8. Gas shut-off valve according to claim 7, characterized in that The valve core includes a first spring, a valve housing, a valve stem, and an O-ring fitted onto the valve housing. The valve housing is installed inside the sampling port, and the valve stem is disposed inside the valve housing along the axial direction. The end of the valve stem away from the actuator extends out of the valve housing. The first spring is also installed at the end of the valve stem near the actuator. Under the action of the first spring, the valve stem can drive the O-ring to seal with the sampling port.

9. Gas shut-off valve according to claim 8, characterized in that The valve housing has external threads, and the valve housing is threadedly connected to the sampling hole of the valve body through the external threads.

10. The gas shutoff valve of claim 8, wherein: The valve stem is fitted with a second sealing gasket at the end away from the actuator, and under the action of the first spring, the valve stem can drive the second sealing gasket to seal with the sampling hole.

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