A manually pressure-regulated sampling probe

Abstract

The present application provides a kind of manual pressure regulating sampling probe, comprising: sampling valve group, pressure reducing valve group, the pressure reducing valve group is installed in the top of sampling valve group, pressure regulating mechanism and temperature regulating mechanism are equipped in the pressure reducing valve group.Manual pressure regulating sampling probe is composed of sampling valve group, pressure reducing valve group, by manual adjustment, import pressure is reduced to certain required export pressure, and rely on the energy of medium itself, make export pressure automatically keep stable.Hand pressure regulating and manual heating function are realized.The modularization problem of natural gas sampling probe is solved, so that sampling probe is more convenient to maintain, disassembly is convenient, can be quickly assembled and quickly repaired.When pipeline pressure is certain, as long as manual adjustment output pressure to a fixed value, its pressure will remain unchanged, and constant, so that pressure regulating valve group design makes pressure regulating more simple and safe.

Description

Technical Field

[0001] This invention relates to the field of sampling equipment technology, and in particular to a manually adjustable voltage sampling probe. Background Technology

[0002] In the long-distance natural gas pipeline transportation, the analysis of the natural gas's quality and characteristics is crucial to ensuring the quality of the incoming natural gas, conducting objective and impartial inspection and quarantine, safeguarding the economic interests of both trading parties, and guaranteeing the safe operation of the pipeline. Typically, analytical instruments are installed at the first station of the long-distance natural gas pipeline to analyze the natural gas's quality and characteristics.

[0003] The purposes of natural gas sampling are: to conduct gas and gas quality monitoring, which includes monitoring of pollutants (impurities), monitoring whether the gas and gas quality meet the agreed and standardized requirements of the parties involved in the transfer, and quality supervision and testing; to obtain gas and gas composition data, to calculate physical property parameters such as density, compressibility factor, and calorific value, and to participate in flow rate (trade transfer measurement) calculations.

[0004] Analytical sampling methods are divided into direct sampling and indirect sampling. In direct sampling, the sample is directly transported from the gas source to the analytical unit, that is, from the sampling point of the gas pipeline to the online process analysis instruments, mainly including gas chromatographs, H2S analyzers, moisture analyzers, and hydrocarbon dew point analyzers. For indirect natural gas sampling, an online automatic sampling system needs to be set up at the station to collect the most representative sample gas from the pipeline to the sample gas cylinder for offline analysis.

[0005] The sampling probe of the online automatic sampling system is installed on the main natural gas pipeline. Natural gas passes through the sampling pipeline, and a sufficient amount of representative gas sample is directly, automatically, and continuously collected into a mobile sample cylinder. The sampling controller completes the predetermined sample collection and transmits the sampling control signal to the upper control system. Typically, the automatic sampling system can continuously and repeatedly extract small amounts of sample without operator intervention, ensuring that any changes in the composition of the natural gas are reflected in the sample.

[0006] Existing sampling devices all use imported sampling probes, which are expensive, pose a high risk of pressure maintenance, require venting natural gas for safe maintenance and repair, and have all functions integrated into a single unit, making operation complex. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a manually adjustable voltage sampling probe to address the shortcomings of the prior art.

[0008] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A manual pressure regulating sampling probe, comprising: a sampling valve group and a pressure reducing valve group, wherein the pressure reducing valve group is installed on the top of the sampling valve group, and the pressure reducing valve group is provided with a pressure regulating mechanism and a temperature regulating mechanism.

[0009] The beneficial effects of adopting the technical solution of this invention are as follows: The manual pressure regulating sampling probe consists of a sampling valve assembly and a pressure reducing valve assembly. Through manual adjustment, the inlet pressure is reduced to a desired outlet pressure, and the outlet pressure is automatically stabilized by the energy of the medium itself. This achieves both manual pressure regulation and manual heating functions. It solves the modularity problem of natural gas sampling probes, making the probe more convenient to maintain and disassemble, allowing for rapid assembly and repair. When the pipeline pressure is constant, as long as the output pressure is manually adjusted to a fixed value, the pressure will remain constant. The material wall thickness is designed to far exceed the operating pressure, making pressure regulation simpler and safer.

[0010] Furthermore, the sampling valve assembly is connected to a flanged full-bore ball valve, and the pressure reducing valve assembly is detachably installed on top of the sampling valve assembly.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the sampling probe is directly inserted into the gas pipeline after passing through a matching flanged full-bore ball valve. The operator can close the ball valve (flanged full-bore ball valve) to cut off the natural gas and safely remove or insert the sampling probe from the pressurized pipeline, realizing online insertion and removal of the probe (sampling probe). Gas transmission does not need to be stopped when the probe is being maintained. The manually adjustable pressure sampling probe is part of a modular design, making it convenient to use. Only the high-pressure section is needed; only the sampling valve assembly needs to be installed. The output pressure is the pressure inside the pipeline and can be directly supplied to the equipment. If the equipment requires pressure reduction, a pressure-reducing valve assembly is installed on top of the sampling valve assembly, and the pressure is reduced before being supplied to the user's equipment.

[0012] Furthermore, the sampling valve assembly includes: a sampling rod, an inlet valve, an outlet valve, and a drain valve. The inlet valve, the outlet valve, and the drain valve are all installed on the sampling rod. The outlet valve is located above the inlet valve, and the drain valve is located above the outlet valve.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are: after sampling from the pipeline, the sample passes through two needle valves. When purging, the drain valve can be opened, and the high-pressure airflow will be sprayed out through the air inlet valve, air outlet valve, and drain valve to blow out the impurities adsorbed on the inner wall of the sampling rod.

[0014] Furthermore, the sampling rod is inserted above the pipe at a distance of 1 / 2 to 1 / 3 of the pipe diameter, and the insertion depth of the sampling rod in the pipe is no more than 120 mm.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are: the sampling probe is inserted into the pipeline at 1 / 2 to 1 / 3 of its diameter above the pipeline, preventing high-speed airflow in the pipeline from causing probe resonance and making it less prone to blockage, thus ensuring the representativeness of the sample gas. It needs to be inserted between 1 / 3 and 1 / 2 of the pipeline diameter; for large pipelines, the insertion depth should not exceed 120 mm.

[0016] Furthermore, the sampling valve assembly is equipped with a bidirectional drain port.

[0017] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the sampling valve assembly (sampling valve group) is installed with a bidirectional drain port, and the drain method is special, which can quickly purge the dirt on the wall of the sampling straight pipe. When the needle valve of the sampling valve assembly is closed, the gas in the upper part can be released by opening the drain port. When the needle valve of the sampling valve assembly is not closed, the residual liquid can be sprayed out.

[0018] Furthermore, the sampling valve assembly is provided with threads or flanges.

[0019] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: for high-pressure sampling above 6 MPa, flange connection is used, with the inner diameter as small as possible. According to the requirements of the required analyzer, there are three specifications: 3 mm, 4 mm, and 5 mm. For low-pressure sampling below 4 MPa, 3 / 4 NPT threaded connection is used. The flange material should be the same as the pipeline material and welded to the pipeline.

[0020] Furthermore, the pressure reducing valve assembly includes: a first housing, an electric heating element, a temperature sensor, a relief valve, a primary pressure gauge, a secondary pressure gauge, a pressure sensor, and a safety valve. The relief valve is installed at the bottom of the first housing, the electric heating element, the temperature sensor, and the primary pressure gauge are all installed in the middle of the first housing, the electric heating element is located above the relief valve, the temperature sensor is located above the electric heating element, the primary pressure gauge is located above the temperature sensor, and the secondary pressure gauge, the pressure sensor, and the safety valve are all installed at the top of the first housing.

[0021] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: The pressure reducing valve assembly is the core component of the modular sampler (probe), integrating multiple functions into one, with complete functions available as needed. Collected oil, water, and other contaminants are discharged through the vent valve. The filter element used for the first filtration is eliminated. A primary pipeline pressure gauge (primary pressure gauge) allows monitoring of the pressure within the pipeline. A secondary pressure gauge and pressure sensor are installed after pressure reduction in the pressure reducing assembly. A safety valve protects downstream equipment for safe operation. Fine dust and moisture filtration can be installed using ordinary clamps. The hydrocarbon dew point pressure reducing assembly is eliminated. From bottom to top, it is divided into the following layers: First layer: Drain valve, which allows the collected oil, water, and other contaminants to be discharged. During operation, do not directly face the drain valve or the outlet. Assess whether the analyzer needs to be stopped during drainage. Second layer: Pressure reducing valve assembly heating layer, isolated from the gas path. Two 100W DC24V heating rods are used to heat the inside of the pressure reducing valve assembly, with the temperature controlled at 50-60 degrees Celsius, to prevent poor drainage or unstable pressure regulation in extremely cold regions. The third layer: Temperature sensors, using an NTC10K temperature probe and an 18B20 digital temperature probe to monitor the temperature rise of the pressure reducing valve assembly. If the 18B20 digital probe fails, the NTC10K temperature probe will automatically take over, transmitting the temperature signal to the temperature controller for automatic control. The second and third layers share an explosion-proof terminal for voltage setting and signal transmission. The fourth layer: A high-pressure gauge (primary pressure gauge) monitors the pipeline pressure. This layer also houses a domestically produced coarse filter element, which intercepts large particles in the natural gas. The filter element can be replaced periodically based on the gas quality. Replacement involves first closing the valve on the sampling valve assembly, opening the drain valve on the first layer to release the pressure, removing the pressure gauge, unscrewing the plug opposite the pressure gauge, and removing the spring. Use a probe to gently push the filter element through the pressure gauge port; the filter element will be pushed out from the plug. After replacing the filter element, install the spring and plug, and finally install the pressure gauge. The fifth layer: Four equipment components in total, mounted face-to-face in an octahedral configuration for ease of installation and processing. Pressure Gauge (Secondary Pressure Gauge): Monitors low pressure after pressure reduction. Calibrates every six months and uses only after passing the calibration. Safety Relief Valve (Safety Valve): Automatically opens to relieve pressure when the pressure relief valve fails to regulate or when pressure rises to the threshold due to operational error, protecting the analyzer from high-pressure surges. Calibrates annually according to analyzer requirements. Pressure Sensor: Provides signal feedback after automatic pressure regulation to complete the automatic pressure adjustment. Can be removed if not needed. Gas Outlet: Includes fine dust and moisture filters; can be removed if not needed. Small High-Pressure Ball Valve: Used to cut off low-pressure gas flow, facilitating maintenance and pressure boosting of the pressure relief valve assembly. Output thread is 1 / 4 NPT internal thread. The pressure regulating assembly, the core component, is located at the top center. Manual pressure adjustment is achieved by pulling the clutch and using the spring mechanism of the assembly. Stability and flow rate during pressure regulation are entirely controlled by this core component.

[0022] Furthermore, the electric heating core includes two heating rods with a power of 100W and a voltage of DC24V. The temperature sensors are an NTC10K temperature probe and an 18B20 digital temperature probe. A filter element is provided near the primary pressure gauge.

[0023] The beneficial effects of adopting the above-mentioned further technical solution are as follows: Two 100W electric heating elements ensure that the required temperature is achieved at low temperatures. The heating layer of the pressure reducing valve assembly is isolated from the gas path, and two 100W DC24V heating rods heat the inside of the pressure reducing valve assembly, controlling the temperature at 50-60 degrees Celsius, preventing poor drainage or unstable pressure regulation in extremely cold regions. Temperature sensors, using an NTC10K temperature probe and an 18B20 digital temperature probe, monitor the temperature rise of the pressure reducing valve assembly. If the 18B20 digital probe fails, the NTC10K temperature probe will automatically take over.

[0024] Furthermore, the pressure regulating mechanism is a manual pressure regulating valve, and the pressure reducing valve assembly is equipped with a clutch, with the pressure regulating mechanism connected to the clutch.

[0025] The beneficial effects of adopting the above-mentioned further technical solution are: the clutch can be manually engaged, and manual pressure adjustment can be achieved through the spring device of the pressure regulating assembly. The stability of the pressure adjustment process and the flow rate are all controlled by the core components. By adjusting the pressure reducing valve, the inlet pressure is reduced to a certain required outlet pressure, and the outlet pressure is automatically kept stable by relying on the energy of the medium itself.

[0026] Furthermore, the pressure regulating mechanism includes: a second housing, a piston, a valve stem, a spring, and an adjusting handle. The second housing has an inlet and an outlet. The piston is mounted on the valve stem, which is slidably mounted in the second housing. The two ends of the spring are respectively connected to the second housing and the valve stem. The adjusting handle is connected to the valve stem.

[0027] The beneficial effects of adopting the above-mentioned further technical solution are as follows: Compressed air with pressure P1 enters from the left end and, after being throttled by the inlet valve, its pressure drops to output P2. The value of P2 can be adjusted by the pressure regulating spring. If the regulating handle is rotated clockwise, the pressure regulating spring is compressed, pushing the diaphragm and valve stem downward, opening the inlet valve, and resulting in air pressure output at the output port. Simultaneously, the output air pressure acts on the diaphragm through the feedback conduit, generating an upward thrust. When this thrust is balanced with the force of the pressure regulating spring, the valve has a stable pressure output. If the output pressure exceeds the set value, the diaphragm moves away from the equilibrium position and deforms upward, causing the overflow valve to open, and excess air is discharged into the atmosphere through the overflow port. When the output pressure approaches the set value, the overflow valve closes, and the forces on the diaphragm remain in a balanced state. If the handle is moved counterclockwise, the pressure regulating spring relaxes, and the air pressure acting on the diaphragm is greater than the spring force, opening the overflow valve and reducing the output pressure until it reaches zero.

[0028] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1 This is one of the structural schematic diagrams of the manually adjustable voltage sampling probe provided in an embodiment of the present invention.

[0030] Figure 2 This is the second schematic diagram of the structure of the manually adjustable voltage sampling probe provided in the embodiment of the present invention.

[0031] Figure 3 This is the third schematic diagram of the structure of the manually adjustable voltage sampling probe provided in the embodiment of the present invention.

[0032] Figure 4 This is one of the structural schematic diagrams of the sampling valve assembly provided in an embodiment of the present invention.

[0033] Figure 5 This is the second schematic diagram of the sampling valve assembly provided in an embodiment of the present invention.

[0034] Figure 6 This is the third schematic diagram of the sampling valve assembly provided in the embodiment of the present invention.

[0035] Figure 7 The fourth schematic diagram of the sampling valve assembly provided in the embodiment of the present invention.

[0036] Figure 8 This is one of the structural schematic diagrams of the pressure reducing valve assembly provided in an embodiment of the present invention.

[0037] Figure 9 This is a second schematic diagram of the pressure reducing valve assembly provided in an embodiment of the present invention.

[0038] Figure 10 This is the third schematic diagram of the pressure reducing valve assembly provided in the embodiment of the present invention.

[0039] Figure 11 The fourth schematic diagram of the pressure reducing valve assembly provided in the embodiment of the present invention.

[0040] Figure 12 for Figure 10 The diagram shows a structure cut along section line AA.

[0041] Figure 13 for Figure 10 The diagram shows a structure cut along section line BB.

[0042] Figure 14 for Figure 10 The diagram shows a structure cut along section line CC.

[0043] Figure 15 for Figure 10 The diagram shows a structure cut along section line DD.

[0044] Figure 16 for Figure 10 The diagram shows a structure cut along section line EE.

[0045] Figure 17 for Figure 10 The diagram shows a structure cut along section line FF.

[0046] Figure 18 for Figure 12 The diagram shows the assembly structure of the structure shown.

[0047] Figure 19 for Figure 13 The diagram shows the assembly structure of the structure shown.

[0048] Figure 20 for Figure 14 The diagram shows the assembly structure of the structure shown.

[0049] Figure 21 for Figure 15 The diagram shows the assembly structure of the structure shown.

[0050] Figure 22 for Figure 16 The diagram shows the assembly structure of the structure shown.

[0051] Figure 23 for Figure 17 The diagram shows the assembly structure of the structure shown.

[0052] Figure 24 This is a schematic diagram of the gas path structure of the sampling valve assembly provided in an embodiment of the present invention.

[0053] Figure 25 This is a schematic diagram of the sampling rod provided in an embodiment of the present invention.

[0054] The following are the reference numerals: 1. Sampling valve assembly; 2. Pressure reducing valve assembly; 4. Sampling rod; 7. Inlet valve; 8. Outlet valve; 9. Drain valve; 10. Drain outlet; 13. Pressure sensor; 14. Safety valve; 15. Secondary pressure gauge; 16. Primary pressure gauge; 17. Filter element; 18. Heating rod; 19. Temperature sensor. Detailed Implementation

[0055] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0056] like Figures 1 to 25As shown, a manually adjustable pressure sampling probe includes: a sampling valve group 1 and a pressure reducing valve group 2. The pressure reducing valve group 2 is installed on the top of the sampling valve group 1, and the pressure reducing valve group 2 is provided with a pressure regulating mechanism and a temperature regulating mechanism.

[0057] The beneficial effects of adopting the technical solution of this invention are as follows: The manual pressure regulating sampling probe consists of a sampling valve assembly and a pressure reducing valve assembly. Through manual adjustment, the inlet pressure is reduced to a desired outlet pressure, and the outlet pressure is automatically stabilized by the energy of the medium itself. This achieves both manual pressure regulation and manual heating functions. It solves the modularity problem of natural gas sampling probes, making the probe more convenient to maintain and disassemble, allowing for rapid assembly and repair. When the pipeline pressure is constant, as long as the output pressure is manually adjusted to a fixed value, the pressure will remain constant. The material wall thickness is designed to far exceed the operating pressure, making pressure regulation simpler and safer.

[0058] Among them, the so-called pressure reducing valve (pressure reducing valve assembly) is a valve that reduces the inlet pressure to a certain required outlet pressure by adjustment, and relies on the energy of the medium itself to automatically maintain a stable outlet pressure.

[0059] The sampling probe (manually adjustable pressure sampling probe) is a device inserted into a gas pipeline, with the other end connected to a sampling conduit. The sampling probe is inserted into the pipeline at 1 / 2 to 1 / 3 of its diameter. The design of the probe (manually adjustable pressure sampling probe) should consider the potential resonance caused by high-speed gas flow in the pipeline and should be resistant to clogging to ensure representativeness of the sample gas. The sampling probe is directly inserted into the gas pipeline after passing through a matching flanged full-bore ball valve. The operator can close the ball valve (flanged full-bore ball valve) to cut off the natural gas supply and safely remove or insert the sampling probe from the pressurized pipeline, enabling online insertion and removal of the probe (sampling probe). Gas supply does not need to be stopped during probe maintenance. The sampling probe features a dual-probe design: one probe is used for sample gas intake, and the other probe is used for sample gas recirculation. This allows the natural gas in the pipeline to provide the back pressure system's gas source, and excess natural gas is returned to the main natural gas pipeline through the other interface of the sampling probe.

[0060] The basic components of a natural gas sample processing system typically include: sample extraction (also known as sampling or collection), sample transfer, sample processing (also known as sample conditioning), and sample discharge. Different types of sampling probes are required for sampling and analysis of different processes and operating conditions.

[0061] Using a sampling probe is an effective means of obtaining parameters of the sampled object. The selection principle of the sampling probe depends on the working conditions of the sampling point, including comprehensive factors such as temperature, pressure, dust content, moisture content, interfering substances, and the components of the process being measured. The sampling probe system ensures that the components of the sample gas are not distorted during the sampling process and achieves primary filtration of the sample through the sampling process.

[0062] The manually adjustable pressure sampling probe is part of a modular design and is easy to use. For example, if only the high-pressure part is used, only the sampling valve assembly needs to be installed, and the output pressure is the pressure inside the pipeline, which can be directly supplied to the equipment. If the equipment needs to reduce pressure, a pressure reducing valve assembly needs to be installed on top of the sampling valve assembly, and the pressure is reduced before being supplied to the user's equipment.

[0063] This invention provides a manually adjustable voltage sampling probe. The sampling probe can be designed as a modular, manually adjustable voltage sensor. Modular design offers advantages such as easy maintenance and disassembly, rapid assembly and repair, and electrical isolation.

[0064] Considering that the natural gas sample contains small amounts of sulfur compounds, mercury, carbon dioxide, water, etc., the material should be 4CrNi1810 and 4CrMo17122 stainless steel. If possible, a polytetrafluoroethylene coating should be used to eliminate the influence of sulfur adsorption on the inner wall.

[0065] Modularization is a way of breaking down complex systems into better manageable modules. It's the process of dividing a system into several modules, layer by layer, from top to bottom when solving a complex problem. Each module has various attributes reflecting its internal characteristics. Each module performs a specific sub-function, and all modules are assembled in a certain way.

[0066] The initial concept of modularization emphasized miniaturization, rapid assembly, and independent modularity. Components are installed when needed and removed when not. These include filters, heaters, purging units, branch outputs, atmospheric pressure sampling, pressure reducing, venting, fine filtration, water removal, integrated microcontroller circuit boards, microcontroller voltage regulating circuit boards, and microcontroller temperature regulating circuit boards. All components can be quickly assembled according to their function, allowing for rapid disassembly, replacement, and repair.

[0067] To function as a whole, modules fulfill the required functions of the entire system. Within the system's structure, modules are combinable, decomposable, and replaceable units. By assigning different functions to different components, a problem can be broken down into multiple small, independent, and interacting components to handle complex, large-scale issues. For natural gas pipeline sampling probes, modularity allows for the determination of required functions based on site conditions.

[0068] like Figures 1 to 25 As shown, the sampling valve assembly 1 is further connected to a flanged full-bore ball valve, and the pressure reducing valve assembly 2 is detachably installed on top of the sampling valve assembly 1.

[0069] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the sampling probe is directly inserted into the gas pipeline after passing through a matching flanged full-bore ball valve. The operator can close the ball valve (flanged full-bore ball valve) to cut off the natural gas and safely remove or insert the sampling probe from the pressurized pipeline, realizing online insertion and removal of the probe (sampling probe). Gas transmission does not need to be stopped when the probe is being maintained. The manually adjustable pressure sampling probe is part of a modular design, making it convenient to use. Only the high-pressure section is needed; only the sampling valve assembly needs to be installed. The output pressure is the pressure inside the pipeline and can be directly supplied to the equipment. If the equipment requires pressure reduction, a pressure-reducing valve assembly is installed on top of the sampling valve assembly, and the pressure is reduced before being supplied to the user's equipment.

[0070] like Figures 1 to 25 As shown, the sampling valve assembly 1 further includes: a sampling rod 4, an inlet valve 7, an outlet valve 8, and a drain valve 9. The inlet valve 7, the outlet valve 8, and the drain valve 9 are all installed on the sampling rod 4. The outlet valve 8 is located above the inlet valve 7, and the drain valve 9 is located above the outlet valve 8.

[0071] The beneficial effects of adopting the above-mentioned further technical solution are: after sampling from the pipeline, the sample passes through two needle valves. When purging, the drain valve can be opened, and the high-pressure airflow will be sprayed out through the air inlet valve, air outlet valve, and drain valve to blow out the impurities adsorbed on the inner wall of the sampling rod.

[0072] During use, the sampling valve assembly will accumulate sulfur compounds, water, dust, etc., on its inner wall. Depending on site requirements, the inner wall of the sampling rod should be periodically purged with a high-pressure natural gas stream. A pressure drop will occur during purging, leading to inaccurate analyzer readings; therefore, the machine must be stopped before purging. Open the blowdown valve to release the gas; the high-pressure airflow will blow out the contaminants from the inner wall of the sampling rod. During operation, personnel should not face the purging valve or the high-pressure exhaust port to prevent personal injury. Closing the inlet valve and opening the gas outlet valve and blowdown valve will reduce the gas pressure in the analyzer's duct to 0 MPa for easier maintenance.

[0073] like Figures 1 to 25 As shown, the sampling rod 4 is inserted above the pipe at a distance of 1 / 2 to 1 / 3 of the pipe diameter, and the insertion depth of the sampling rod 4 in the pipe is no more than 120 mm.

[0074] The beneficial effects of adopting the above-mentioned further technical solution are: the sampling probe is inserted into the pipeline at 1 / 2 to 1 / 3 of its diameter above the pipeline, preventing high-speed airflow in the pipeline from causing probe resonance and making it less prone to blockage, thus ensuring the representativeness of the sample gas. It needs to be inserted between 1 / 3 and 1 / 2 of the pipeline diameter; for large pipelines, the insertion depth should not exceed 120 mm.

[0075] like Figures 1 to 25 As shown, the sampling valve assembly 1 is further provided with a bidirectional drain port 10.

[0076] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the sampling valve assembly (sampling valve group) is installed with a bidirectional drain port, and the drain method is special, which can quickly purge the dirt on the wall of the sampling straight pipe. When the needle valve of the sampling valve assembly is closed, the gas in the upper part can be released by opening the drain port. When the needle valve of the sampling valve assembly is not closed, the residual liquid can be sprayed out.

[0077] like Figures 1 to 25 As shown, the sampling valve assembly 1 is further provided with threads or flanges.

[0078] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: for high-pressure sampling above 6 MPa, flange connection is used, with the inner diameter as small as possible. According to the requirements of the required analyzer, there are three specifications: 3 mm, 4 mm, and 5 mm. For low-pressure sampling below 4 MPa, 3 / 4 NPT threaded connection is used. The flange material should be the same as the pipeline material and welded to the pipeline.

[0079] like Figures 1 to 25 As shown, the pressure reducing valve assembly 2 further includes: a first housing, an electric heating element, a temperature sensor 19, a relief valve, a primary pressure gauge 16, a secondary pressure gauge 15, a pressure sensor 13, and a safety valve 14. The relief valve is installed at the bottom of the first housing. The electric heating element, the temperature sensor 19, and the primary pressure gauge 16 are all installed in the middle of the first housing. The electric heating element is located above the relief valve, the temperature sensor 19 is located above the electric heating element, the primary pressure gauge is located above the temperature sensor, and the secondary pressure gauge 15, the pressure sensor 13, and the safety valve are all installed at the top of the first housing.

[0080] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: The pressure reducing valve assembly is the core component of the modular sampler (probe), integrating multiple functions into one, with complete functions available as needed. Collected oil, water, and other contaminants are discharged through the vent valve. The filter element used for the first filtration is eliminated. A primary pipeline pressure gauge (primary pressure gauge) allows monitoring of the pressure within the pipeline. A secondary pressure gauge and pressure sensor are installed after pressure reduction in the pressure reducing assembly. A safety valve protects downstream equipment for safe operation. Fine dust and moisture filtration can be installed using ordinary clamps. The hydrocarbon dew point pressure reducing assembly is eliminated. From bottom to top, it is divided into the following layers: First layer: Drain valve, which allows the collected oil, water, and other contaminants to be discharged. During operation, do not directly face the drain valve or the outlet. Assess whether the analyzer needs to be stopped during drainage. Second layer: Pressure reducing valve assembly heating layer, isolated from the gas path. Two 100W DC24V heating rods are used to heat the inside of the pressure reducing valve assembly, with the temperature controlled at 50-60 degrees Celsius, to prevent poor drainage or unstable pressure regulation in extremely cold regions. The third layer: Temperature sensors, using an NTC10K temperature probe and an 18B20 digital temperature probe to monitor the temperature rise of the pressure reducing valve assembly. If the 18B20 digital probe fails, the NTC10K temperature probe will automatically take over, transmitting the temperature signal to the temperature controller for automatic control. The second and third layers share an explosion-proof terminal for voltage setting and signal transmission. The fourth layer: A high-pressure gauge (primary pressure gauge) monitors the pipeline pressure. This layer also houses a domestically produced coarse filter element, which intercepts large particles in the natural gas. The filter element can be replaced periodically based on the gas quality. Replacement involves first closing the valve on the sampling valve assembly, opening the drain valve on the first layer to release the pressure, removing the pressure gauge, unscrewing the plug opposite the pressure gauge, and removing the spring. Use a probe to gently push the filter element through the pressure gauge port; the filter element will be pushed out from the plug. After replacing the filter element, install the spring and plug, and finally install the pressure gauge. The fifth layer: Four equipment components in total, mounted face-to-face in an octahedral configuration for ease of installation and processing. Pressure Gauge (Secondary Pressure Gauge): Monitors low pressure after pressure reduction. Calibrates every six months and uses only after passing the calibration. Safety Relief Valve (Safety Valve): Automatically opens to relieve pressure when the pressure relief valve fails to regulate or when pressure rises to the threshold due to operational error, protecting the analyzer from high-pressure surges. Calibrates annually according to analyzer requirements. Pressure Sensor: Provides signal feedback after automatic pressure regulation to complete the automatic pressure adjustment. Can be removed if not needed. Gas Outlet: Includes fine dust and moisture filters; can be removed if not needed. Small High-Pressure Ball Valve: Used to cut off low-pressure gas flow, facilitating maintenance and pressure boosting of the pressure relief valve assembly. Output thread is 1 / 4 NPT internal thread. The pressure regulating assembly, the core component, is located at the top center. Manual pressure adjustment is achieved by pulling the clutch and using the spring mechanism of the assembly. Stability and flow rate during pressure regulation are entirely controlled by this core component.

[0081] like Figures 1 to 25 As shown, the electric heating core further includes two heating rods 18, each with a power of 100W and a voltage of DC24V. The temperature sensors are an NTC10K temperature probe and an 18B20 digital temperature probe. A filter element 17 is provided near the position of the primary pressure gauge 16.

[0082] The beneficial effects of adopting the above-mentioned further technical solution are as follows: Two 100W electric heating elements ensure that the required temperature is achieved at low temperatures. The heating layer of the pressure reducing valve assembly is isolated from the gas path, and two 100W DC24V heating rods heat the inside of the pressure reducing valve assembly, controlling the temperature at 50-60 degrees Celsius, preventing poor drainage or unstable pressure regulation in extremely cold regions. Temperature sensors, using an NTC10K temperature probe and an 18B20 digital temperature probe, monitor the temperature rise of the pressure reducing valve assembly. If the 18B20 digital probe fails, the NTC10K temperature probe will automatically take over.

[0083] Furthermore, the pressure regulating mechanism is a manual pressure regulating valve, and the pressure reducing valve assembly is equipped with a clutch, with the pressure regulating mechanism connected to the clutch.

[0084] The beneficial effects of adopting the above-mentioned further technical solution are: the clutch can be manually engaged, and manual pressure adjustment can be achieved through the spring device of the pressure regulating assembly. The stability of the pressure adjustment process and the flow rate are all controlled by the core components. By adjusting the pressure reducing valve, the inlet pressure is reduced to a certain required outlet pressure, and the outlet pressure is automatically kept stable by relying on the energy of the medium itself.

[0085] The pressure regulating assembly, the core component of the pressure reducing valve group, is located at the center. Manual pressure regulation can be achieved by manually engaging the clutch and using the spring mechanism of the pressure regulating assembly. The stability of the pressure regulation process and the flow rate are entirely controlled by this core component.

[0086] A manual pressure regulating valve is a type of regulating valve that allows for manual pressure adjustment. As the name suggests, a pressure regulating valve (also known as a regulating mechanism or control valve) is a type of valve whose pressure is adjusted manually. It plays a significant role in some mechanical products. High-pressure gases transported in pipelines, such as natural gas, biogas, and hydrogen, are reduced in pressure by being forced into a relatively large cavity through a small orifice. This pressure reduction is achieved by throttling. One side of the diaphragm or piston is the outlet, and the other side is where the manually applied pressure is applied. This pressure is connected to a valve stem and diaphragm (piston) that control the size of the orifice. Thus, as long as a fixed pressure is applied, the pressure in the outlet will always be equal to that pressure. This manually applied pressure can be provided by a spring, a pneumatic source, or a hydraulic source.

[0087] Furthermore, the pressure regulating mechanism includes: a second housing, a piston, a valve stem, a spring, and an adjusting handle. The second housing has an inlet and an outlet. The piston is mounted on the valve stem, which is slidably mounted in the second housing. The two ends of the spring are respectively connected to the second housing and the valve stem. The adjusting handle is connected to the valve stem.

[0088] The beneficial effects of adopting the above-mentioned further technical solution are as follows: Compressed air with pressure P1 enters from the left end and, after being throttled by the inlet valve, its pressure drops to output P2. The value of P2 can be adjusted by the pressure regulating spring. If the regulating handle is rotated clockwise, the pressure regulating spring is compressed, pushing the diaphragm and valve stem downward, opening the inlet valve, and resulting in air pressure output at the output port. Simultaneously, the output air pressure acts on the diaphragm through the feedback conduit, generating an upward thrust. When this thrust is balanced with the force of the pressure regulating spring, the valve has a stable pressure output. If the output pressure exceeds the set value, the diaphragm moves away from the equilibrium position and deforms upward, causing the overflow valve to open, and excess air is discharged into the atmosphere through the overflow port. When the output pressure approaches the set value, the overflow valve closes, and the forces on the diaphragm remain in a balanced state. If the handle is moved counterclockwise, the pressure regulating spring relaxes, and the air pressure acting on the diaphragm is greater than the spring force, opening the overflow valve and reducing the output pressure until it reaches zero.

[0089] The main functions of this invention (manual pressure regulating sampling probe) include: purging the sampling gas path, venting the pressure reducing valve group, coarse filtration of the sampling gas path, sewage discharge and drainage, pressure reduction of high-pressure gas, monitoring of high-pressure gas and monitoring of low-pressure gas, heating inside the pressure reducing valve group, safety relief of overpressure, and filtration of ultra-fine dust and moisture.

[0090] After sampling from the pipeline, the sample passes through two needle valves. During purging, the blowdown valve can be opened, and high-pressure airflow will be ejected through the inlet valve, gas outlet valve, and blowdown valve to blow out the impurities adsorbed on the inner wall of the sampling rod.

[0091] The main body of this invention embodiment is divided into a sampling valve group and a pressure reducing valve group.

[0092] (1) Sampling valve assembly

[0093] The sampling valve assembly has two connection methods on the pipeline: threaded connection and flange connection.

[0094] This invention employs flange connections for high-pressure sampling above 6 MPa, with the inner diameter kept as small as possible. Three specifications are available: 3mm, 4mm, and 5mm, depending on the required analyzer. For low-pressure sampling below 4 MPa, 3 / 4 NPT threaded connections are used. The flange material should match the pipeline material and be welded to the pipeline. The high-end sampling valve assembly (sampling valve assembly) is installed with a bidirectional drain port and a unique draining method that allows for rapid purging of contaminants from the sampling straight pipe wall.

[0095] With the sampling valve assembly needle valve closed, the upper gas can be released by opening the drain port. Leaving the sampling valve assembly needle valve open will allow residual liquid to be sprayed out.

[0096] It needs to be inserted into the pipeline to 1 / 3 or 1 / 2 of its length. If it is a large pipeline, the insertion depth should not exceed 120mm.

[0097] There is no difference between low-pressure and high-pressure rods; pipe supports are used for low-pressure applications, while flanges are used for high-pressure applications.

[0098] (2) Pressure reducing valve assembly

[0099] The pressure reducing valve assembly is the core component of the modular sampler (probe), integrating multiple functions into one, offering a full range of features to suit various needs.

[0100] The pressure reducing valve consists of the following parts: 1. Two 100W electric heating elements to ensure the required temperature is reached at low temperatures; 2. Oil, water, and other contaminants are collected and discharged through a relief valve; 3. The filter element used for the first filtration is not required; 4. A primary pipeline pressure gauge to monitor the pressure inside the pipeline; 5. A secondary pressure gauge and pressure sensor after pressure reduction by the pressure reducing assembly; 6. A safety valve to protect downstream equipment for safe operation; 7. The ultrafine dust and moisture filtration item can be installed using a standard clamp; 8. The hydrocarbon dew point pressure reducing assembly is not required.

[0101] The internal air passage of the pressure reducing valve assembly is divided into the following layers from bottom to top:

[0102] First layer: Sewage discharge valve (sewage valve), which can discharge the oily and sludge collected here through the discharge valve. Do not operate directly in front of the discharge valve or the air outlet. When discharging sewage, assess whether the analyzer equipment needs to be stopped.

[0103] The second layer is the pressure reducing valve assembly heating layer, which is isolated from the gas path. Two 100W DC24V heating rods are used to heat the inside of the pressure reducing valve assembly, and the temperature is controlled at 50-60 degrees Celsius. This prevents poor drainage or unstable pressure regulation in extremely cold regions.

[0104] The third layer consists of temperature sensors. An NTC10K temperature probe and an 18B20 digital temperature probe are used to monitor the temperature rise of the pressure reducing valve assembly. If the 18B20 digital probe fails, the NTC10K temperature probe will automatically take over, transmitting the temperature signal to the temperature controller for automatic control. The second and third layers share a single explosion-proof terminal for voltage input and signal transmission.

[0105] The fourth layer: A high-pressure gauge (primary pressure gauge) is used to monitor the pipeline pressure. This layer also contains a coarse filter element; large particles in the natural gas are intercepted here. The filter element can be replaced periodically based on the gas quality conditions. To replace it, first close the valve on the sampling valve assembly, open the drain valve on the first layer to release the pressure, remove the pressure gauge, unscrew the plug opposite the pressure gauge, and remove the spring. Use a probe to gently push the filter element through the pressure gauge port; the filter element can be pushed out from the plug. After replacing the filter element, install the spring and plug, and finally install the pressure gauge.

[0106] The fifth layer consists of four equipment components, which are mounted face-to-face in an octahedral manner for ease of installation and processing.

[0107] Pressure gauge (secondary pressure gauge): A pressure gauge after pressure reduction, used to monitor low pressure. It should be calibrated every six months and used only after passing the calibration.

[0108] Safety relief valve (safety valve): When the pressure reducing valve assembly fails to regulate the pressure and the pressure rises due to an operational error, or when the pressure rises to the threshold value, the safety relief valve automatically opens to release pressure, protecting the analyzer from damage caused by high-pressure surges. The safety relief valve should be calibrated annually, with the set value adjusted according to the analyzer's requirements.

[0109] Pressure sensor: Used for signal feedback after automatic pressure regulation to complete the automatic pressure regulation process. Installation can be omitted if not needed.

[0110] Gas outlet: Equipped with a fine dust and moisture filter assembly; this can be omitted if not needed. A small high-pressure ball valve is used to cut off the low-pressure gas path, facilitating maintenance and pressure boosting adjustments of the pressure reducing valve assembly. The output thread interface is a 1 / 4 NPT internal thread. The pressure regulating assembly, the core component for pressure regulation, is located at the top center. Manual pressure regulation is achieved by manually engaging the clutch and using the spring mechanism of the pressure regulating assembly. The stability of the pressure regulation process and the flow rate are entirely controlled by this core component.

[0111] Compressed air at pressure P1 enters from the left end, and after being throttled by the inlet valve, the pressure drops to output pressure P2. P2 can be adjusted by the pressure regulating spring. Turning the regulating handle clockwise compresses the spring, pushing the diaphragm and valve stem downwards, opening the inlet valve, and resulting in air pressure output at the outlet. Simultaneously, the output air pressure acts on the diaphragm through the feedback conduit, generating an upward thrust. When this thrust balances the force of the pressure regulating spring, the valve provides a stable pressure output.

[0112] If the output pressure exceeds the set value, the diaphragm moves upward from its equilibrium position, causing the relief valve to open and allowing excess air to escape into the atmosphere through the overflow port. When the output pressure approaches the set value, the relief valve closes, and the forces on the diaphragm remain in equilibrium. If the handle is turned counterclockwise, the pressure regulating spring relaxes, and the air pressure acting on the diaphragm exceeds the spring force, causing the relief valve to open and the output pressure to decrease until it reaches zero.

[0113] The modular design of the natural gas sampling probe addresses this issue, making it easier to maintain and disassemble, allowing for rapid assembly and repair. In the event of a gas leak, combustible gas will not escape into the explosion-proof enclosure (explosion-proof control box), achieving electrical separation. When the pipeline pressure is constant, the pressure remains unchanged and constant once the output pressure is manually adjusted to a set value. The material wall thickness is designed to far exceed the operating pressure, making manual pressure adjustment simpler and safer.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A manually adjustable voltage sampling probe, characterized in that, The system includes: a sampling valve assembly and a pressure reducing valve assembly. The pressure reducing valve assembly is installed on top of the sampling valve assembly and includes a pressure regulating mechanism and a temperature regulating mechanism. The sampling valve assembly is connected to a flanged full-bore ball valve, and the pressure reducing valve assembly is detachably installed on top of the sampling valve assembly. The sampling valve assembly includes: a sampling rod, an inlet valve, an outlet valve, and a drain valve. The inlet valve, the outlet valve, and the drain valve are all installed on the sampling rod. The outlet valve is located above the inlet valve, and the drain valve is located above the outlet valve. The sampling rod is inserted into the pipe at a depth of 1 / 2 to 1 / 3 of the pipe diameter, and the insertion depth of the sampling rod in the pipe is no more than 120 mm. The sampling valve assembly has a bidirectional drain port.

2. The manually adjustable voltage sampling probe according to claim 1, characterized in that, The sampling valve assembly is equipped with threads or flanges.

3. The manually adjustable voltage sampling probe according to claim 1, characterized in that, The pressure reducing valve assembly includes: a first housing, an electric heating element, a temperature sensor, a relief valve, a primary pressure gauge, a secondary pressure gauge, a pressure sensor, and a safety valve. The relief valve is installed at the bottom of the first housing. The electric heating element, the temperature sensor, and the primary pressure gauge are all installed in the middle of the first housing. The electric heating element is located above the relief valve, the temperature sensor is located above the electric heating element, and the primary pressure gauge is located above the temperature sensor. The secondary pressure gauge, the pressure sensor, and the safety valve are all installed at the top of the first housing.

4. A manually adjustable voltage sampling probe according to claim 3, characterized in that, The electric heating element includes two heating rods with a power of 100W and a voltage of DC24V. The temperature sensors are an NTC10K temperature probe and an 18B20 digital temperature probe. A filter element is located near the primary pressure gauge.

5. A manually adjustable voltage sampling probe according to claim 1, characterized in that, The pressure regulating mechanism is a manual pressure regulating valve, and the pressure reducing valve group is equipped with a clutch. The pressure regulating mechanism is connected to the clutch.

6. A manually adjustable voltage sampling probe according to claim 5, characterized in that, The pressure regulating mechanism includes: a second housing, a piston, a valve stem, a spring, and an adjusting handle. The second housing has an inlet and an outlet. The piston is mounted on the valve stem, which is slidably mounted in the second housing. The two ends of the spring are respectively connected to the second housing and the valve stem. The adjusting handle is connected to the valve stem.

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