Pressure reducing valve group and sampler with same

Abstract

The invention discloses a pressure reducing valve group and a sampler with the same, relates to the technical field of pipelines, and aims to solve the problem that relatively constant gas conforming to a set output pressure value cannot be obtained under the condition that gas pressure in a pipeline fluctuates. The pressure reducing valve group comprises a valve seat and a pressure reducing valve group main body, the pressure reducing valve group main body is arranged on the valve seat, the pressure reducing valve group main body comprises a plurality of pressure reducing valves, and the plurality of pressure reducing valves are configured to perform pressure reduction on gas for multiple times so as to output gas meeting a set output pressure value. In the flowing direction of the gas, the multiple pressure reducing valves are sequentially arranged, and every two adjacent pressure reducing valves in the multiple pressure reducing valves are communicated.

Description

Technical Field

[0001] The present application relates to the field of pipeline technology, and in particular to a pressure reducing valve assembly and a sampler having the same. Background Art

[0002] The pressure reducing valve group is a key pressure regulating device in a gas (e.g., natural gas) pipeline. The pressure reducing valve can be used to reduce the pressure of the natural gas in the pipeline to meet the demand for natural gas at different pressures.

[0003] In the related art, the pressure reducing valve has the following characteristics: after the pressure value is set, when the pressure of the natural gas in the pipeline fluctuates (e.g., rises), that is, when the pressure of the natural gas on the input side (i.e., inlet) of the pressure reducing valve rises, the pressure value of the natural gas on the output side (i.e., outlet) of the pressure reducing valve decreases instead; when the pressure of the natural gas in the pipeline fluctuates (e.g., drops), that is, when the pressure of the natural gas on the input side of the pressure reducing valve drops, the pressure value of the natural gas on the output side of the pressure reducing valve increases instead.

[0004] Thus, since the pressure fluctuation of the natural gas on the input side of the pressure reducing valve is obvious, the pressure fluctuation of the natural gas on the output side of the pressure reducing valve is also obvious, and thus it is impossible to obtain a relatively constant natural gas that meets the set output pressure value. Summary of the Invention

[0005] The purpose of the present application is to provide a pressure reducing valve group and a sampler having the same, aiming to solve the problem that when the gas pressure in the pipeline fluctuates, it is impossible to obtain a relatively constant gas that meets the set output pressure value.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] The present application provides a pressure reducing valve group, which includes a valve seat and a pressure reducing valve group body. The pressure reducing valve group body is arranged on the valve seat. The pressure reducing valve group body includes multiple pressure reducing valves. The multiple pressure reducing valves are configured to reduce the pressure of gas in a pipeline multiple times to output gas that meets a set output pressure value; in the flow direction of the gas, the multiple pressure reducing valves are arranged in sequence, and two adjacent pressure reducing valves among the multiple pressure reducing valves are connected.

[0008] The pressure reducing valve group provided in the embodiment of the present application reduces the pressure of the gas multiple times through multiple pressure reducing valves to reduce the fluctuation of the gas pressure, thereby obtaining a relatively constant gas that meets the set output pressure value.

[0009] In some embodiments, the plurality of pressure reducing valves include a first pressure reducing valve, a second pressure reducing valve, and a third pressure reducing valve. The first pressure reducing valve is configured to reduce the pressure of gas entering the pressure reducing valve assembly from a pipeline for a first time. The second pressure reducing valve is configured to reduce the pressure of the gas that has undergone the first pressure reduction for a second time. The third pressure reducing valve is configured to reduce the pressure of the gas that has undergone the second pressure reduction for a third time.

[0010] In some embodiments, the pressure reducing valve assembly further comprises a first output port, a second output port, and a third output port. The first output port is located on the output side of the first pressure reducing valve and is configured to output the gas after the first pressure reduction. The second output port is located on the output side of the second pressure reducing valve and is configured to output the gas after the second pressure reduction. The third output port is located on the output side of the third pressure reducing valve and is configured to output the gas after the third pressure reduction.

[0011] In some embodiments, the first pressure-reducing valve includes a first valve port gasket having a first through hole, the second pressure-reducing valve includes a second valve port gasket having a second through hole, and the third pressure-reducing valve includes a third valve port gasket having a third through hole. The diameter of the first through hole is smaller than the diameter of the second through hole, and the diameter of the second through hole is smaller than the diameter of the third through hole.

[0012] In some embodiments, the first pressure reducing valve further comprises a first spring, the second pressure reducing valve further comprises a second spring, and the third pressure reducing valve further comprises a third spring. The stiffness of the first spring is greater than the stiffness of the second spring, and the stiffness of the second spring is greater than the stiffness of the third spring.

[0013] In some embodiments, the pressure reducing valve group further includes a collection chamber, a drain valve, a filter element, and a relief valve. The collection chamber is located at the inlet of the pipeline into the pressure reducing valve group and is configured to collect condensed water and impurities in the gas in the pipeline. The drain valve is located in the collection chamber and is configured to discharge condensed water and impurities in the collection chamber. The filter element is located at the output side of the collection chamber and is configured to filter the gas flowing through the collection chamber. The relief valve is located at the output side of the third pressure reducing valve and is configured to discharge gas whose pressure exceeds a preset pressure value.

[0014] In some embodiments, the pressure reducing valve assembly further comprises a first pressure gauge, a second pressure gauge, a third pressure gauge, and a fourth pressure gauge. The first pressure gauge is located at the output side of the first pressure reducing valve and is configured to monitor the pressure of the gas after the first pressure reduction. The second pressure gauge is located at the output side of the second pressure reducing valve and is configured to monitor the pressure of the gas after the second pressure reduction. The third pressure gauge is located at the output side of the third pressure reducing valve and is configured to monitor the pressure of the gas after the third pressure reduction. The fourth pressure gauge is located at the output side of the filter element and is configured to monitor the pressure of the gas in the pipeline.

[0015] In some embodiments, the pressure reducing valve assembly further includes a first handle, a second handle, and a third handle. The first handle is connected to the first pressure reducing valve and is configured to control the opening of the first pressure reducing valve. The second handle is connected to the second pressure reducing valve and is configured to control the opening of the second pressure reducing valve. The third handle is connected to the third pressure reducing valve and is configured to control the opening of the third pressure reducing valve.

[0016] In some embodiments, a line connecting the first pressure-reducing valve and the third pressure-reducing valve and a line connecting the second pressure-reducing valve and the valve seat are perpendicular to each other.

[0017] In some embodiments, the first pressure-reducing valve and the third pressure-reducing valve are symmetrically arranged with respect to a line connecting the second pressure-reducing valve and the valve seat.

[0018] The present application also provides a sampler, which includes a sampling valve group and the pressure reducing valve group, and the pressure reducing valve group is connected to the sampling valve group.

[0019] The sampler provided in the present application includes the above-mentioned pressure reducing valve group. Therefore, the pressure reducing valve group provided in the present application solves the same technical problem and has the same technical effect as the flat pressure reducing valve group of the above-mentioned technical solution, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 is a front view of a pressure reducing valve assembly according to some embodiments;

[0022] Figure 2 is a rear view of a pressure reducing valve assembly according to some embodiments;

[0023] Figure 3A is a structural diagram of a valve port gasket according to some embodiments;

[0024] Figure 3B is a structural diagram of another valve port gasket according to some embodiments;

[0025] Figure 3C is a structural diagram of another valve port gasket according to some embodiments;

[0026] Figure 4 is a block diagram of a pressure reducing valve according to some embodiments;

[0027] Figure 5 is a flow chart of a natural gas flow path according to some embodiments;

[0028] Figure 6 is a block diagram of a sampler according to some embodiments.

[0029] Reference numerals:

[0030] 1-first handle; 2-fourth pressure gauge; 3-first pressure gauge; 4-second handle; 5-second pressure gauge; 6-third pressure gauge; 7-third handle; 8-third output port; 9-drain valve; 10-second output port; 11-filter element; 12-first output port; 13-drain valve; 14-valve seat; 15-first valve port gasket; 150-first through hole; 16-second valve port gasket; 160-second through hole; 17-third valve port gasket; 170-first Three-way hole; 18-pressure reducing valve group body; 19-pressure reducing valve; 190-screw; 191-first pressure reducing valve; 192-second pressure reducing valve; 193-third pressure reducing valve; 194-spring; 195-diaphragm; 196-thimble; 197-valve port pad; 198-valve core; 20-output port; 21-first through hole; 22-second through hole; 23-third through hole; 24-through hole; 30-sampling valve group; 40-sampler; 100-pressure reducing valve group. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "front," "back," "inner," "outer," and the like, indicating directions or positional relationships, are based on the directions or relative positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this application. Unless otherwise specified, the above-mentioned directionality descriptions may be flexibly set in actual application, provided that the relative positional relationships shown in the accompanying drawings are met.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be directly connected, indirectly connected through an intermediary, or internally connected between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0035] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, article, or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, article, or device comprising the element.

[0036] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0037] In the related art, the pressure reducing valve has the following physical effect: after the pressure value is set, when the pressure of the gas (e.g., natural gas) in the pipeline fluctuates (e.g., rises), that is, when the pressure of the natural gas on the input side (i.e., inlet) of the pressure reducing valve rises, the pressure value of the natural gas on the output side (i.e., outlet) of the pressure reducing valve decreases instead; when the pressure of the natural gas in the pipeline fluctuates (e.g., drops), that is, when the pressure of the natural gas on the input side of the pressure reducing valve drops, the pressure value of the natural gas on the output side of the pressure reducing valve increases instead.

[0038] For example, the natural gas pressure in a pipeline is 10 MPa. The flow rate of natural gas in the pipeline will change according to actual demand, causing the natural gas pressure to fluctuate. When the outflow of natural gas in the pipeline exceeds the inflow, the natural gas pressure in the pipeline will drop (for example, slightly less than 10 MPa); when the inflow of natural gas in the pipeline exceeds the outflow, the natural gas pressure in the pipeline will rise (for example, slightly greater than 10 MPa). If the pressure of the natural gas output by the pressure reducing valve (the set output pressure value) is set to 6 MPa, then when the natural gas pressure in the pipeline rises, the natural gas pressure output by the pressure reducing valve will be less than 6 MPa; when the natural gas pressure in the pipeline drops, the natural gas pressure output by the pressure reducing valve will be greater than 6 MPa.

[0039] In this way, since the pressure fluctuation of the natural gas on the input side of the pressure reducing valve is obvious, the pressure fluctuation of the natural gas on the output side of the pressure reducing valve will be affected significantly, so that a relatively constant natural gas that meets the set output pressure value cannot be obtained, affecting the stability of natural gas sampling.

[0040] In order to solve the above problems, some embodiments of the present disclosure provide a pressure reducing valve group, which is used for sampling gas in a pipeline. For example, the gas in the pipeline may be natural gas, and through sampling, it can serve the sample gas supply of a chromatograph, a hydrocarbon dew point meter, a calorific value meter, a water dew point meter, a hydrogen sulfide analyzer, etc.

[0041] The preceding article uses a pressure reducing valve assembly for sampling a natural gas pipeline as an example. However, the present disclosure is not limited to this application. The pipeline may also contain other gases besides natural gas, such as hydrogen or carbon dioxide. In other words, the pressure reducing valve assembly can be used to sample a variety of gases within the pipeline. The present disclosure does not impose any restrictions on the type of gas within the pipeline.

[0042] The following description will be made using the example of natural gas as the gas in the pipeline.

[0043] Figure 1 is a front view of a pressure reducing valve assembly according to some embodiments. Figure 2 is a rear view of a pressure reducing valve assembly according to some embodiments.

[0044] like Figure 1 and Figure 2As shown, pressure reducing valve assembly 100 includes a valve seat 14 and a pressure reducing valve assembly body 18. Pressure reducing valve assembly body 18 is mounted on valve seat 14. Pressure reducing valve assembly body 18 includes multiple pressure reducing valves 19. These pressure reducing valves 19 are configured to reduce the pressure of natural gas multiple times to output natural gas at a set output pressure. The pressure reducing valves 19 are arranged sequentially in the direction of natural gas flow, with adjacent valves 19 communicating with each other.

[0045] Here, the sequential arrangement of multiple pressure reducing valves 19 may mean that the natural gas in the pipeline flows sequentially through the multiple pressure reducing valves 19. For example, the multiple pressure reducing valves 19 include N pressure reducing valves 19. The communication between two adjacent pressure reducing valves 19 in the multiple pressure reducing valves 19 may mean that the outlet side of the first pressure reducing valve 19 is connected to the inlet side of the second pressure reducing valve 19, the outlet side of the second pressure reducing valve 19 is connected to the outlet side of the third pressure reducing valve 19, ... the outlet side of the (N-1)th pressure reducing valve 19 is connected to the inlet side of the Nth pressure reducing valve 19, and so on. The inlet side of the first pressure reducing valve 19 is connected to the natural gas in the pipeline.

[0046] The pressure value of the natural gas in the pipeline fluctuating (i.e., rising or falling) is set to a preset fluctuation value. The pressure value of the natural gas output by the first pressure reducing valve 19 is set to a first pressure value before the natural gas in the pipeline fluctuates. This first pressure value is also the set pressure value of the natural gas output by the first pressure reducing valve 19. Taking the case where the natural gas pressure fluctuation in the pipeline is a pressure rise as an example, since the inlet side of the first pressure reducing valve 19 is connected to the natural gas in the pipeline, when the natural gas pressure fluctuation in the pipeline is a pressure rise, the pressure of the natural gas at the inlet side of the first pressure reducing valve 19 rises. After passing through the first pressure reducing valve 19, the pressure of the natural gas at the outlet side of the first pressure reducing valve 19 will decrease, thereby becoming less than the first pressure value. The reduced pressure value is set to the first fluctuation value.

[0047] After the first decompression, as the natural gas pressure value decreases, the first fluctuation value will be smaller than the preset fluctuation value.

[0048] Before the natural gas in the pipeline fluctuates, the pressure of the natural gas output by the second pressure reducing valve 19 is a second pressure value, which is also the set pressure value of the natural gas output by the second pressure reducing valve 19. Because the outlet of the first pressure reducing valve 19 is connected to the inlet of the second pressure reducing valve 19, if the pressure of the natural gas at the inlet of the second pressure reducing valve 19 drops, the pressure of the natural gas at the outlet of the second pressure reducing valve 19 will rise after passing through the second pressure reducing valve 19, thus exceeding the second pressure value. This increased pressure value is set as the second fluctuation value.

[0049] After the second decompression, as the natural gas pressure value further decreases, the second fluctuation value will be smaller than the first fluctuation value.

[0050] It should be noted that the smaller the fluctuation in the natural gas pressure at the input side of the pressure reducing valve 19, the smaller the fluctuation in the natural gas pressure at the output side of the pressure reducing valve 19. The more times the pressure is reduced, the smaller the fluctuation. Thus, with multiple pressure reductions, the fluctuation in the natural gas pressure at each outlet of the pressure reducing valve assembly 100 will continue to decrease, thereby achieving a constant natural gas pressure that meets the set output pressure value.

[0051] Compared with the pressure reducing valve in the related art that reduces the pressure only once, when the adjusted pressure difference is large, such as directly reducing 10 MPa to 1 MPa, the pressure reducing valve group 100 in some embodiments of the present disclosure reduces the pressure from 10 MPa to 1 MPa multiple times (e.g., at least three times), which can greatly reduce the fluctuation at the outlet and reduce the physical effect of the pressure reducing valve, thereby achieving a constant natural gas pressure value.

[0052] In related technologies, pressure reducing valves typically use a single-stage pressure reduction mechanism. Consequently, when the pressure differential is large, such as from 10 MPa to 1 MPa, the Joule-Thomson effect occurs during the pressure reduction process. As the pressure decreases, the temperature of the natural gas decreases by approximately 0.5°C / 0.1 MPa. This causes light hydrocarbons to condense and solidify, forming ice on the valve core, affecting flow stability and normal output. Severe hydrocarbon precipitation can affect the chromatograph's accurate analysis of the molar content of natural gas components, directly impacting the accuracy of natural gas metering.

[0053] The pressure reducing valve group 100 of some embodiments of the present disclosure adopts multi-stage pressure reduction. In this way, each time it passes through a pressure reducing valve 19, the pressure is reduced to a certain extent. By adjusting a larger pressure difference through multiple pressure reducing valves 19, the condensation and solidification of light hydrocarbon components can be reduced, thereby reducing the formation of ice, and further improving the accuracy of the molar content analysis of natural gas components.

[0054] In the related art, the pressure reducing valve is provided with only one output port, and the output port outputs natural gas of one pressure, which cannot meet the demand for natural gas of multiple pressures.

[0055] In some embodiments, as Figure 2 As shown, the pressure reducing valve assembly 100 further includes a plurality of output ports 20, which are provided corresponding to the plurality of pressure reducing valves 19. For example, each output port 20 is located on the output side of a corresponding pressure reducing valve 19 and is configured to output natural gas after the pressure has been reduced by the pressure reducing valve 19. Thus, by providing the pressure reducing valve assembly 100 with multiple output ports 20, natural gas at multiple different pressures can be output, meeting various pressure requirements (e.g., for use with different analyzers), allowing for flexible selection of output ports.

[0056] Figure 3A 1 is a structural diagram of a valve port gasket according to some embodiments. Figure 3Bis a structural diagram of another valve port gasket according to some embodiments. Figure 3C FIG. 4 is a structural diagram of another valve port gasket according to some embodiments.

[0057] In some embodiments, as Figure 2 、 Figures 3A to 3C As shown, the pressure reducing valve group 100 further includes a plurality of valve port pads 197, and the plurality of valve port pads 197 correspond to the plurality of pressure reducing valves 19. Each valve port pad 197 includes a through hole 24, and the through holes 24 of the plurality of valve port pads 197 have different sizes (e.g., diameters) to output natural gas at different flow rates, thereby outputting natural gas at different pressures.

[0058] In some embodiments, the material of the multiple valve port gaskets 197 can be polychlorotrifluoroethylene (PCTFE), which has the characteristics of high temperature resistance, low temperature resistance and corrosion resistance, thereby providing long-lasting and reliable sealing performance. In addition, it is safer and simpler to maintain during use.

[0059] Combined with the following Figures 2 to 3C The following description takes the example of the multiple pressure reducing valves 19 including three pressure reducing valves 19. Of course, the multiple pressure reducing valves 19 may also include more than three pressure reducing valves 19, such as four pressure reducing valves 19, five pressure reducing valves 19, etc. Correspondingly, the multiple output ports 20 may also include more than three output ports 20, such as four output ports 20, five output ports 20, etc., and this disclosure is not limited to this.

[0060] In some embodiments, as Figure 2 As shown, the plurality of pressure reducing valves 19 include a first pressure reducing valve 191, a second pressure reducing valve 192, and a third pressure reducing valve 193. The first pressure reducing valve 191 is configured to perform a first pressure reduction on the natural gas entering the pressure reducing valve assembly 100 from the pipeline. The second pressure reducing valve 192 is configured to perform a second pressure reduction on the natural gas that has undergone the first pressure reduction. The third pressure reducing valve 193 is configured to perform a third pressure reduction on the natural gas that has undergone the second pressure reduction.

[0061] In some embodiments, as Figure 2 As shown, the pressure reducing valve assembly 100 includes a first output port 12, a second output port 10, and a third output port 8. The first output port 12 is located on the output side of the first pressure reducing valve 191 and is configured to output the natural gas that has undergone the first pressure reduction. The second output port 10 is located on the output side of the second pressure reducing valve 192 and is configured to output the natural gas that has undergone the second pressure reduction. The third output port 8 is located on the output side of the third pressure reducing valve 193 and is configured to output the natural gas that has undergone the third pressure reduction.

[0062] In some embodiments, as Figure 2 、 Figures 3A to 3CAs shown, the plurality of valve port gaskets 197 include three valve port gaskets 197, wherein the first pressure reducing valve 191 includes a first valve port gasket 15 having a first through hole 21. The second pressure reducing valve 192 includes a second valve port gasket 16 having a second through hole 22. The third pressure reducing valve 193 includes a third valve port gasket 17 having a third through hole 23.

[0063] Here, the diameter of the first through hole 21 is smaller than that of the second through hole 22 , and the diameter of the second through hole 22 is smaller than that of the third through hole 23 .

[0064] Due to the high pressure of natural gas in the pipeline, first pressure reducing valve 191 uses a low-flow valve port gasket (first valve port gasket 15) to ensure the safe flow of natural gas output. Second pressure reducing valve 192 uses an intermediate-flow valve port gasket (second valve port gasket 16) to ensure sufficient output flow. Third pressure reducing valve 193 uses a high-flow valve port gasket (third valve port gasket 17) to prevent insufficient flow after multi-stage pressure reduction and increase the stability of output flow and pressure.

[0065] In some embodiments, the first pressure-reducing valve 191 also includes a first spring (high-pressure spring) to ensure a safe and stable natural gas flow and output at a sufficiently high pressure. The second pressure-reducing valve 192 also includes a second spring (medium-pressure spring) to output natural gas at a lower pressure. The third pressure-reducing valve 193 also includes a third spring (low-pressure spring) to output natural gas at an extremely low pressure. The stiffness of the first spring is greater than that of the second spring, which in turn is greater than that of the third spring.

[0066] In some embodiments, such as Figure 2 As shown, the pressure reducing valve group 100 also includes a collecting chamber, a drain valve 13, a filter element 11 and a relief valve 9. The collecting chamber is provided at the inlet of the pipeline into the pressure reducing valve group and is configured to collect condensed water and impurities in the natural gas in the pipeline. The drain valve 13 is provided in the collecting chamber and is configured to discharge the condensed water and impurities in the collecting chamber. The filter element 11 is provided on the output side of the collecting chamber and is configured to filter the natural gas flowing through the collecting chamber. The relief valve 9 is provided on the output side of the third pressure reducing valve 193 and is configured to discharge natural gas whose pressure exceeds a preset pressure value. Here, the main function of the relief valve 9 is to prevent damage to the analyzer due to overpressure. Because the flow rate is very small in the design and will not exceed 300CC / min, the relief valve can discharge the overpressure gas. The pressure after the first two stages of pressure reduction will stabilize at a normal value without overpressure due to insufficient incoming gas flow.

[0067] In some embodiments, such as Figure 2As shown, the pressure reducing valve assembly 100 further includes a first pressure gauge 3, a second pressure gauge 5, a third pressure gauge 6, and a fourth pressure gauge 2. The first pressure gauge 3 is located at the output side of the first pressure reducing valve 191 and is configured to monitor the pressure of the natural gas after the first pressure reduction. The second pressure gauge 5 is located at the output side of the second pressure reducing valve 192 and is configured to monitor the pressure of the natural gas after the second pressure reduction. The third pressure gauge 6 is located at the output side of the third pressure reducing valve 193 and is configured to monitor the pressure of the natural gas after the third pressure reduction. The fourth pressure gauge 2 is located at the output side of the filter element 11 and is configured to monitor the pressure of the natural gas in the pipeline.

[0068] In some embodiments, as Figure 2 As shown, the pressure reducing valve assembly 100 further includes a first handle 1, a second handle 4, and a third handle 7. The first handle 1 is connected to the first pressure reducing valve 191 and is configured to control the opening of the first pressure reducing valve 191. The second handle 4 is connected to the second pressure reducing valve 192 and is configured to control the opening of the second pressure reducing valve 192. The third handle 7 is connected to the third pressure reducing valve 193 and is configured to control the opening of the third pressure reducing valve 193.

[0069] In some embodiments, as Figure 1 and Figure 2 As shown, the line connecting the first pressure reducing valve 191 and the third pressure reducing valve 193 and the line connecting the second pressure reducing valve 192 and the valve seat are perpendicular to each other.

[0070] In some embodiments, as Figure 1 and Figure 2 As shown, the first pressure reducing valve 191 and the third pressure reducing valve 193 are symmetrically arranged about the line connecting the second pressure reducing valve 192 and the valve seat 14 .

[0071] In this way, by setting the pressure reducing valve group 100 to a symmetrical structure, the appearance of the pressure reducing valve group 100 can be improved, and the circulation of natural gas and processing and production can be facilitated.

[0072] Figure 4 is a block diagram of a pressure reducing valve according to some embodiments.

[0073] like Figure 4 As shown, each pressure reducing valve 19 includes a screw 190, at least one spring 194, a diaphragm 195, a pin 196, a valve port gasket 197, and a valve core 198. The screw 190, at least one spring 194, the diaphragm 195, the pin 196, the valve port gasket 197, and the valve core 198 are connected in sequence to achieve the pressure reducing function of the pressure reducing valve 19.

[0074] In some embodiments, the main interface of the pressure reducing valve assembly 100 adopts a 1 / 2NPT external thread interface to prevent natural gas leakage. An O-ring groove is provided on the thread and a high ejector pin is provided on the outside to achieve an anti-drop design.

[0075] Combined with the following Figure 5 , the flow path of high-pressure natural gas from the pipeline into the pressure reducing valve group 100 is described.

[0076] Figure 5 FIG. 4 is a flow chart illustrating a natural gas flow path according to some embodiments.

[0077] like Figure 5 As shown, the flow path of natural gas from the pipeline into the pressure reducing valve assembly 100 includes steps 101 to 105.

[0078] In step 101, high-pressure natural gas enters a collection chamber, which collects impurities such as moisture, dust, and oil. A drain valve 13 is provided on the collection chamber, which can be opened to periodically drain the waste. For example, after the drain valve is opened, the high-pressure natural gas is used to blow impurities out of the collection chamber.

[0079] In step 102, natural gas is coarsely filtered through a filter element 11. For example, the filter element 11 comprises a 50-micron filter element. The filtered natural gas reaches a fourth pressure gauge 2, which displays the pressure of the natural gas in the pipeline.

[0080] In step 103, the natural gas reaches the first pressure reducing valve 191 and undergoes a first pressure reduction, and then the pressure is monitored by the first pressure gauge 3. The natural gas after the first pressure reduction can be output through the first output port 12. If output is not required, the first output port 12 can be blocked with a plug.

[0081] In step 104, the natural gas continues to flow to the second pressure reducing valve 192 and undergoes a second pressure reduction. The pressure is then monitored by the second pressure gauge 5. The natural gas after the second pressure reduction can be output through the second output port 10. If output is not required, the second output port 10 can be blocked with a plug.

[0082] In step 105, the natural gas continues to flow to the third pressure reducing valve 193 and undergoes a third pressure reduction. The pressure is then monitored by the third pressure gauge 6. The natural gas after the third pressure reduction can be output through the third output port 8. If output is not desired, the third output port 8 can be blocked with a plug.

[0083] It should be noted that the pressure of the natural gas after the third decompression is low and can be directly supplied to an analyzer, for example, a 20 Psi chromatograph analyzer (the corresponding natural gas pressure is approximately 0.14 MPa).

[0084] It should be noted that after the third decompression, an ultrafine dust filter assembly can be installed on the output side of the third output port 8 to remove dust and moisture from the natural gas. The interface of the ultrafine dust filter assembly can be a 1 / 4 NPT male and female thread, which facilitates quick and easy installation. For example, the ultrafine dust filter assembly includes a dust filter and moisture-absorbing filter paper. If the natural gas output from the third output port 8 is supplied to a water dew point analyzer, the ultrafine dust filter assembly (i.e., the dust filter and moisture-absorbing filter paper) can be omitted.

[0085] It should be noted that since the relief valve is located on the output side of the third output port, if it is necessary to output natural gas after passing through first pressure reducing valve 191 and to ensure the use of the relief valve, the second-stage and third-stage pressure reducing valves must be fully opened (e.g., fully screwed clockwise). That is, the natural gas after passing through first pressure reducing valve 191 passes directly through the second-stage and third-stage pressure reducing valves without undergoing the second and third pressure reductions, and can be directly output through the third output port, thereby allowing the relief valve to perform its protective function. Similarly, if it is necessary to output natural gas after passing through second pressure reducing valve 192, the third pressure reducing valve must be opened. That is, the natural gas after passing through second pressure reducing valve 192 passes directly through third pressure reducing valve 193 without undergoing the third pressure reduction, thereby allowing the relief valve to perform its protective function and ensure a smooth gas path.

[0086] It should be noted that all components in the pressure reducing valve assembly 100 (eg, drain valve, pressure gauge, etc.) adopt 1 / 4NPT internal thread to facilitate standard installation.

[0087] The pressure reducing valve group 100 of some embodiments of the present disclosure has a sewage purge function, a filtering function, a pressure selection function according to demand, an ultrafine dust dehumidification function, and a pressure protection safety relief function to protect the precision components of the analyzer and prevent overpressure damage.

[0088] Figure 6 is a block diagram of a sampler according to some embodiments.

[0089] like Figure 6 As shown, some embodiments of the present disclosure further provide a sampler 40, which includes a sampling valve group 30 and a pressure reducing valve group. The pressure reducing valve group can be the pressure reducing valve group 100 described above, and the pressure reducing valve group 100 is connected to the sampling valve group 30 (for example, a detachable connection). For example, the pressure reducing valve group 100 is located above the sampling valve group 30, and a portion of the sampling valve group 30 can be inserted into a pipeline to enable sampling of natural gas. In the description of this specification, specific features, structures, materials, or characteristics can be combined in any appropriate manner in any one or more embodiments or examples.

[0090] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A pressure reducing valve assembly, comprising a valve seat and a pressure reducing valve assembly body, wherein the pressure reducing valve assembly body is arranged on the valve seat, characterized in that: The main body of the pressure reducing valve group includes multiple pressure reducing valves, which are configured to reduce the pressure of the gas in the pipeline multiple times to output gas that meets the set output pressure value; wherein, in the flow direction of the gas, the multiple pressure reducing valves are arranged in sequence, and two adjacent pressure reducing valves among the multiple pressure reducing valves are connected.

2. The pressure reducing valve assembly according to claim 1, characterized in that: The plurality of pressure reducing valves include: a first pressure reducing valve, configured to reduce the pressure of the gas entering the pressure reducing valve group from the pipeline for the first time; a second pressure reducing valve configured to perform a second pressure reduction on the gas that has undergone the first pressure reduction; and The third pressure reducing valve is configured to perform a third pressure reduction on the gas that has undergone the second pressure reduction.

3. The pressure reducing valve assembly according to claim 2, characterized in that: The pressure reducing valve group further includes: a first output port, located at an output side of the first pressure reducing valve and configured to output the gas that has undergone the first pressure reduction; a second output port, located at an output side of the second pressure reducing valve and configured to output the gas that has undergone a second pressure reduction; and The third output port is located at the output side of the third pressure reducing valve and is configured to output the gas that has undergone the third pressure reduction.

4. The pressure reducing valve assembly according to claim 3, characterized in that: The first pressure reducing valve includes a first valve port gasket having a first through hole, the second pressure reducing valve includes a second valve port gasket having a second through hole, and the third pressure reducing valve includes a third valve port gasket having a third through hole; The diameter of the first through hole is smaller than that of the second through hole, and the diameter of the second through hole is smaller than that of the third through hole.

5. The pressure reducing valve assembly according to claim 4, characterized in that: The first pressure reducing valve further includes a first spring, the second pressure reducing valve further includes a second spring, and the third pressure reducing valve further includes a third spring; The stiffness of the first spring is greater than that of the second spring, and the stiffness of the second spring is greater than that of the third spring.

6. The pressure reducing valve assembly according to claim 5, characterized in that: The pressure reducing valve group further includes: a collecting chamber, provided at the inlet of the pipeline into the pressure reducing valve group, and configured to collect condensed water and impurities in the gas in the pipeline; a drain valve, disposed in the collecting chamber and configured to discharge condensed water and impurities in the collecting chamber; a filter element, disposed at an output side of the collecting chamber and configured to filter the gas flowing through the collecting chamber; and The relief valve is provided at the output side of the third pressure reducing valve and is configured to discharge gas whose pressure exceeds a preset pressure value.

7. The pressure reducing valve assembly according to claim 6, characterized in that: The pressure reducing valve group further includes: a first pressure gauge, provided at an output side of the first pressure reducing valve and configured to monitor the pressure of the gas that has undergone the first pressure reduction; a second pressure gauge, provided at an output side of the second pressure reducing valve and configured to monitor the pressure of the gas that has undergone the second pressure reduction; a third pressure gauge, provided at an output side of the third pressure reducing valve and configured to monitor the pressure of the gas that has undergone the third pressure reduction; and A fourth pressure gauge is provided at the output side of the filter element and is configured to monitor the pressure of the gas in the pipeline.

8. The pressure reducing valve assembly according to claim 7, characterized in that: The pressure reducing valve group further includes: a first handle connected to the first pressure reducing valve and configured to control the opening of the first pressure reducing valve; a second handle connected to the second pressure reducing valve and configured to control the opening of the second pressure reducing valve; and The third handle is connected to the third pressure reducing valve and is configured to control the opening of the third pressure reducing valve.

9. The pressure reducing valve assembly according to claim 8, characterized in that: A line connecting the first pressure reducing valve and the third pressure reducing valve and a line connecting the second pressure reducing valve and the valve seat are perpendicular to each other.

10. The pressure reducing valve assembly according to claim 9, characterized in that: The first pressure reducing valve and the third pressure reducing valve are symmetrically arranged with respect to a line connecting the second pressure reducing valve and the valve seat.

11. A sampler, characterized in that: include: Sampling valve group; as well as The pressure reducing valve group according to any one of claims 1 to 10, wherein the pressure reducing valve group is connected to the sampling valve group.

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