Post-treatment system with pressure detection tubing assembly.

Abstract

An aftertreatment system includes a housing and a tube assembly. The housing has a peripheral wall including an outer surface, an inner surface defining a passage configured to receive a flow of exhaust gas, and a peripheral wall aperture. The tube assembly includes a fitting assembly and a conveying tube. The fitting assembly includes a fitting body and a fitting tube. The fitting body includes a fitting body aperture, an upper surface, and a lower surface. The fitting body is inserted within the peripheral wall aperture and coupled to the outer surface. The fitting tube extends from the lower surface and is disposed in the passage and includes a fitting tube aperture at an inner end. The conveying tube is positioned partially within the fitting body aperture and extends outward from the fitting body and includes a conveying tube aperture at an inner end.

Description

1 / 30 Post-treatment system with pressure detection tubing assembly. REFERENCE BY WAY TO RELATED REQUEST

[0001] This PCT application claims the benefit and priority of U.S. Provisional Patent Application No. 18 / 120,043, filed March 10, 2023, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present disclosure relates generally to systems and devices for detecting the pressure of an exhaust gas in an after-treatment system of an internal combustion engine system. BACKGROUND OF THE INVENTION

[0003] For internal combustion engine systems, such as diesel engine systems, pressure sensors can be used in various applications within an aftertreatment system to measure the pressure (e.g., static pressure) of the exhaust gases. In some applications, for example, it may be desirable to use a pressure sensor to measure the backpressure caused by a particulate filter, such as a diesel particulate filter (DPF). A particulate filter is used to remove particulate matter (PM) (e.g., soot particles, carbon, ash, metallic abrasion particles, sulfates, and silicates) from the exhaust gases. By measuring the backpressure near the particulate filter, the proper functioning of the aftertreatment system can be maintained.

[0004] Pressure measurements can be obtained using a transport tube that extends into an exhaust duct and directs the exhaust gas to a pressure sensor. The transport tube can be inserted deep into the exhaust duct to increase the accuracy of the pressure readings. SUMMARY Petition 870250077872, dated 01 / 09 / 2025, pages 195 / 230 2 / 30

[0005] When a transport tube is used for pressure measurements, the insertion depth of the transport tube dictates the amount of space (e.g., clearance, etc.) required to remove, repair, or install a transport tube. Depending on the arrangement of surrounding components, the amount of space available to facilitate the removal, service, or installation of the pressure sampling tube may be limited. The embodiments of the present disclosure address this problem.

[0006] In one embodiment, an aftertreatment system includes a housing and a tube assembly. The housing has a perimeter wall including an outer surface and an inner surface. The inner surface defines a passage configured to receive an exhaust gas flow. The perimeter wall also includes a perimeter wall opening. The tube assembly includes a fitting assembly and a transport tube. The fitting assembly includes a fitting body and a fitting tube. The fitting body includes a fitting body opening, an upper surface, and a lower surface. The fitting body is inserted within the perimeter wall opening and coupled to the outer surface. The fitting tube extends from the lower surface and is disposed in the passage and includes a fitting tube opening at an inner end of the fitting tube.The transport tube is positioned partially inside the opening of the fitting body and extends outside the fitting body, and includes a transport tube opening at one inner end of the transport tube.

[0007] In another embodiment, a pressure sensing tube assembly includes a plug-in assembly, a coupling tube, and a nut. The plug-in assembly includes a plug-in body and a plug-in tube. The plug-in body includes a plug-in body opening, an upper surface, and a lower surface. The plug-in tube extends from the surface Petition 870250077872, dated 01 / 09 / 2025, pp. 196 / 230 The 3 / 30 lower section includes a fitting tube opening at one inner end of the fitting tube. The inner end is distal to the fitting body. The coupling tube includes an enlarged end. The nut is disposed between the coupling tube and the fitting body and is configured to be threaded onto the fitting body so as to compress the enlarged end against the fitting body.

[0008] In yet another embodiment, a set of fittings for a pressure sensing tube assembly includes a fitting body, a fitting tube, and a nut. The fitting body includes a fitting body opening, an upper surface, a lower surface, and an inner surface. The socket body opening is not threaded. The inner surface includes a threaded fitting portion. The fitting tube extends from the lower surface and includes a fitting tube opening at an inner end of the fitting tube. The inner end is distal to the fitting body. The nut includes a nut insertion portion and a nut opening. The nut insertion portion includes a threaded nut portion that is configured to be threaded onto the threaded fitting portion.The nut opening is not threaded and is configured to align with the opening of the fitting body when the threaded portion of the nut is threaded onto the threaded portion of the fitting. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic block diagram of an exemplary after-treatment system; Figure 2 is a perspective view of a portion of an after-treatment system including an example pressure sensing assembly with the tubing assembly shown partially removed from a housing of the pressure sensing assembly; Petition 870250077872, dated 01 / 09 / 2025, pp. 197 / 230 4 / 30 Figure 3 is a cross-sectional view of a portion of the post-treatment system shown in Figure 2, obtained along plane AA, according to various embodiments; Figure 4 is a perspective view of the socket assembly of the pipe assembly shown in Figure 3; Figure 5 is a back view of the set of fittings shown in Figure 4; Figure 6 is a front view of the set of fittings shown in Figure 4; Figure 7 is a cross-sectional view of the set of fittings shown in Figure 4 taken along plane AA; Figure 8 is a cross-sectional view of a portion of the post-treatment system shown in Figure 2 according to various embodiments; Figure 9 is a side view of a portion of the pipe assembly shown in Figure 8; Figure 10 is a perspective view of another example set of fittings for a pipe assembly; Figure 11 is a back view of the set of fittings shown in Figure 10; Figure 12 is a front view of the set of fittings shown in Figure 10; Figure 13 is a side view of the set of fittings shown in Figure 10; Figure 14 is a perspective view of an example fitting tube for a fitting assembly; Figure 15 is a bottom view of the fitting tube shown in Figure 14; Figure 16 is a perspective view of another sample socket tube for a socket set; Figure 17 is a bottom view of the fitting tube shown in Figure 16; Petition 870250077872, dated 01 / 09 / 2025, pp. 198 / 230 5 / 30 Figure 18 is a side view of the fitting tube shown in Figure 16; Figure 19 is a perspective view of another example set of fittings for a pipe assembly; Figure 20 is a background view of the socket assembly shown in Figure 19; Figure 21 is a side view of the socket assembly shown in Figure 19; Figure 22 is a perspective view of another set of sample fittings for a set of tubes; Figure 23 is a back view of the assembly of fittings shown in Figure 22; and Figure 24 is a side view of the assembly of fittings shown in Figure 22. DETAILED DESCRIPTION

[0009] The following provides more detailed descriptions of various concepts related to, and implementations of, methods, apparatus, and for exhaust gas sampling in an after-treatment system of an internal combustion engine. The various concepts presented above and discussed in more detail below can be implemented in various ways, as the concepts described are not limited to any specific method of implementation. The examples of specific implementations and applications are provided primarily for illustrative purposes. I. Overview

[0010] Internal combustion engines (e.g., diesel internal combustion engines, etc.) produce exhaust gas containing particulate matter. In some applications, a sensor monitors the amount of particulate matter. When the amount of particulate matter is above a threshold, for example, in a diesel particulate filter (DPF), the sensor signals a controller (e.g., engine control unit (ECU)). Petition 870250077872, dated 01 / 09 / 2025, pages 199 / 230 6 / 30 engine control unit) to initiate a regeneration process (e.g., injecting fuel into the exhaust system) to burn and clean the particulate matter.

[0011] Exhaust gas monitoring can be achieved by sampling the exhaust gas flow within the aftertreatment system using various sensors, such as a pressure sensor. Sampling is performed using a tube that collects samples of the exhaust gas flow and carries exhaust gas to a pressure sensor to measure the exhaust gas pressure in the tube. The transport tube extends into a passageway through which the exhaust gases flow. The exhaust gas pressure within the transport tube changes so that the exhaust gas pressure within the transport tube matches the pressure of the sampled exhaust gas flow. Over time, the transport tube may fail due to corrosion, cracks, blockages, and other failures. Therefore, maintenance (e.g., repair, replacement, removal, installation, etc.) of the transport tube may be desired.Typical transport pipes require an amount of available space outside the aftertreatment system equivalent to the depth of insertion of the transport pipe, in order to remove and repair the transport pipe. However, as aftertreatment systems become increasingly larger and more complex, the available space around the aftertreatment system is becoming more scarce. As a result, transport pipes may require more space for maintenance than is available, reducing operability. In such situations, service procedures may require the removal of the exhaust system or additional non-exhaust-related components nearby. In some cases, maintenance can be omitted entirely and the entire exhaust assembly can be replaced.

[0012] Pressure sensors may require transport tubing that extends to various positions and depths, depending on the constraints associated with a specific application. For example, some applications require Petition 870250077872, dated 01 / 09 / 2025, pp. 200 / 230 7 / 30 that transport tubes be inserted deep into the passage within which the exhaust gas flows, such as in the center of the exhaust gas flow, to reduce the effects of thermophoresis and facilitate a more uniform pressure reading. Thermophoresis is the transport force that occurs due to the presence of a temperature gradient. This can cause exhaust particulate particles less than 10 μm in diameter to migrate to lower temperature regions in the transport tube. Thermophoresis can cause the formation of deposits in transport tubes, resulting in blockages and inaccurate pressure readings by the pressure sensor. However, the amount of space required to accommodate these transport tubes may exceed the available space, resulting in undesirable service procedures such as the removal of the entire DPF system or drive shaft of a vehicle, increasing service time and cost.As a result, it is important that the proper insertion depth be maintained to reduce thermophoretic forces, minimizing the space required to accommodate a transport tube.

[0013] The implementations described in the present invention relate to a tube assembly including a set of fittings extending into a passage within which exhaust gas flows and a transport tube inserted within the fitting assembly to sample the exhaust gas for pressure detection. As a result, the tube assembly described in the present invention is capable of sampling exhaust gases while reducing the amount of space required to accommodate the transport tube, thereby improving operability, particularly in space-constrained applications. II. Example of a post-treatment system

[0014] Figure 1 represents a post-treatment system 100 that has an exemplary reducing agent release system 102 for a system of Petition 870250077872, dated 01 / 09 / 2025, pages 201 / 230 8 / 30 exhaust duct 104. The after-treatment system 100 includes the reductant injection system 102, a particulate filter (e.g., a diesel particulate filter (DPF)) 106, a regeneration device 103, a pressure sensing assembly 152, a decomposition chamber 108 (e.g., a reactor, a reactor piping, etc.) and a selective catalytic reduction (SCR) catalyst 110.

[0015] The DPF 106 is configured to remove particulate matter, such as soot, from the exhaust gases flowing in the exhaust duct system 104. The DPF 106 includes an inlet, where the exhaust gas is received, and an outlet, from which the exhaust gas exits after the particulate matter has been substantially filtered from the exhaust gas and / or after converting the particulate matter into carbon dioxide.

[0016] The regeneration device 103 is configured to initiate a process to regenerate the DPF 106 by injecting a hydrocarbon fluid (e.g., fuel, oil, etc.) into the exhaust gas stream to heat the exhaust gas stream. Periodic regeneration of the DPF 106 is necessary for proper operation. The regeneration device 103 is fluidly coupled to the exhaust duct system 104 upstream of the DPF 106. The regeneration device 103 can burn off accumulated soot in the DPF 106 to reduce harmful exhaust emissions and facilitate prolonged operation of the DPF 106 for engine efficiency. In various embodiments, the regeneration device 103 can be coupled to a catalyst, such as a diesel oxidation catalyst (DOC), to oxidize hydrocarbons and carbon monoxide in the exhaust gases and generate heat to regenerate the DPF 106.In various embodiments, the 103 regeneration device may include an injector (e.g., fuel injector, hydrocarbon injector, etc.). In these embodiments, the 103 regeneration device may also include an igniter (e.g., ignition spark, etc.) which is... Petition 870250077872, dated 01 / 09 / 2025, pp. 202 / 230 9 / 30 configured to facilitate the combustion of the injected hydrocarbon fluid. In some embodiments, the regeneration device 103 is or includes an electric heater (e.g., resistance heater, etc.).

[0017] The pressure sensing assembly 152 is configured to facilitate the measurement of exhaust gas pressure. In several embodiments, the pressure sensing assembly 152 is positioned downstream of the DPF 106. However, in other embodiments, the pressure sensing assembly 152 is additionally or alternatively positioned upstream of the DPF 106.

[0018] The pressure sensing assembly 152 may include a pressure sensor 148. The pressure sensor 148 is configured to monitor and measure the static pressure of the exhaust gases flowing through the pressure sensing assembly 152. The pressure sensor 148 can measure the backpressure caused by an exhaust aftertreatment device, such as the DPF 106. In some embodiments, the pressure sensor 148 is a differential pressure sensor connected to the DPF 106 through two conduits (e.g., hoses, pipes, etc.), one connecting upstream of the DPF 106 and the other downstream of the DPF 106. The differential pressure sensor can measure and compare the exhaust gas pressure difference before and after the DPF 106 to estimate the amount of particulate matter trapped in the DPF 106. As soot accumulates in the DPF 106, the pressure difference between one pressure of Exhaust gas on the inlet side and an increase in the exhaust gas pressure on the outlet side of the DPF 106.

[0019] Pressure sensor 148 is configured to communicate with a central controller 136 (e.g., engine control unit (ECU)), engine control module (ECM), etc.) of an internal combustion engine that has the after-treatment system 100. Pressure sensor 148 communicates data to the central controller 136, which will interpret the data to determine when to trigger regeneration via the regeneration device 103. Petition 870250077872, dated 01 / 09 / 2025, pages 203 / 230 10 / 30

[0020] Figures 2 to 9 illustrate the pressure sensing assembly 152 in more detail according to various embodiments. The pressure sensing assembly 152 includes a tube assembly 200 including the socket assembly 220. Figures 10 to 24 illustrate the socket assembly 220, or portions of the socket assembly 220, in more detail according to various embodiments. As explained in more detail in the present invention, the pressure sensing assembly 152 is configured to facilitate sampling of the exhaust gas flowing through the pressure sensing assembly 152 so that a pressure sensor can measure the exhaust gas pressure. The pressure sensing assembly 152 is structured so that the insertion depth of a transport tube into the exhaust gas flow for sampling the exhaust gas is reduced.In some applications, maintaining a conveyor tube can become difficult when the required external space for conveyor tube maintenance is unavailable (e.g., tight spaces), because removing the conveyor tube may require removing the exhaust system or additional nearby components such as the DPF 106. Therefore, the 152 pressure sensing assembly offers advantages over other systems that do not minimize the external space required to service the conveyor tube.

[0021] Decomposition chamber 108 is configured to convert a reducing agent into ammonia. The reducing agent may be, for example, urea, diesel exhaust fluid (DEF), AdBlue®, a urea water solution (UWS), an aqueous urea solution (e.g., AUS32, etc.) and other similar fluids. Decomposition chamber 108 includes an inlet fluid-coupled to (e.g., fluid-configured to communicate with) DPF 106 to receive the exhaust gas and an outlet for the Petition 870250077872, dated 01 / 09 / 2025, pages 204 / 230 11 / 30 exhaust gas, ammonia and / or the reducing agent flow to the SCR 110 catalyst.

[0022] The reducer injection system 102 includes a dosing module 112 (e.g., metering device, etc.) configured to dose the reducer entering the decomposition chamber 108 (e.g., via an injector). The dosing module 112 is mounted in the decomposition chamber 108 so that the dosing module 112 can dose the application of reducer in the exhaust gas flowing through the exhaust duct system 104. The dosing module 112 may include an insulator interposed between a portion of the dosing module 112 and the portion of the decomposition chamber 108 in which the dosing module 112 is mounted.

[0023] The dosing module 112 is fluidly coupled to a reducer source 114. The reducer source 114 may include multiple reducer sources 114. The reducer source 114 may be, for example, a diesel exhaust fluid tank containing AdBlue®. A reducer pump 116 (e.g., a supply unit, etc.) is used to pressurize the reducer from the reducer source 114 for injection into the dosing module 112. In some embodiments, the reducer pump 116 is pressure-controlled (e.g., controlled to achieve a target pressure, etc.). The reducer pump 116 includes a reducer filter 118. The reducer filter 118 filters the reducer before it is supplied to the internal components (e.g., pistons, blades, etc.) of the reducer pump 116.

[0024] The dosing module 112 includes at least one injector 120. Each injector 120 is configured to dose the reducer into the exhaust gas (e.g., into the decomposition chamber 108, etc.). In some embodiments, the reducer delivery system 102 also includes an air pump 122. In these embodiments, the air pump 122 draws air from an air source 124 (e.g., air intake, etc.) and through an air filter 126 located upstream of the air pump 122. Additionally, the air pump 122 supplies air to the dosing module 112 through a duct. In these embodiments, the module of Petition 870250077872, dated 01 / 09 / 2025, pages 205 / 230 The 12 / 30 dosing module 112 is configured to mix air and reducer into an air-reducer mixture and supply the air-reducer mixture to the decomposition chamber 108. In other embodiments, the reducer release system 102 does not include the air pump 122 or the air source 124. In such embodiments, the dosing module 112 is not configured to mix the reducer with air.

[0025] The dosing module 112 and the reducer pump 116 are also electrically or communicatively coupled to a reducer application system controller 128. The reducer injection system controller 128 is configured to control the dosing module 112 to dose the reducer into the decomposition chamber 108. The reducer application system controller 128 can also be configured to control the reducer pump 116.

[0026] The reducer release system controller 128 includes a processing circuit 130. The processing circuit 130 includes a processor 132 and a memory 134. The processor 132 may include a microprocessor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), etc., or combinations thereof. The memory 134 may include, but is not limited to, an electronic, optical, magnetic, or any other storage or transmission device capable of providing program instructions to a processor, an ASIC, an FPGA, etc.This memory 134 may include a memory chip, an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), flash memory, or any other suitable memory from which the reducer release system controller 128 can read the instructions. The instructions may include code in any programming language. Petition 870250077872, dated 01 / 09 / 2025, pages 206 / 230 13 / 30 proper programming. Memory 134 may include several modules containing instructions that are configured to be implemented by processor 132. In several embodiments, the reducer release system controller 128 is configured to communicate with the central controller 136. In some embodiments, the central controller 136 and the reducer release system controller 128 are integrated into a single controller.

[0027] In some embodiments, the central controller 136 is communicable with a display device (e.g., a screen, a monitor, a touch screen, a heads-up display (HUD), an indicator light, etc.). The display device can be configured to change state in response to receiving information from the central controller 136. For example, the display device can be configured to switch between a static state (e.g., showing a green light, displaying a “SYSTEM OK” message, etc.) and an alarm state (e.g., showing a flashing red light, displaying a “MAINTENANCE REQUIRED” message, etc.) based on communication from the central controller 136. With the change of state, the display device can provide an indication to a user (e.g., an operator, etc.) of a state (e.g., in operation, in need of maintenance, etc.) of the reducer release system 102.

[0028] The decomposition chamber 108 is located upstream of the SCR catalyst 110. As a result, the reductant is injected upstream of the SCR catalyst 110, so that the SCR catalyst 110 receives a mixture of the reductant and the exhaust gas. The reductant droplets are subjected to evaporation, thermolysis and hydrolysis processes to form NOx-free emissions (e.g., gaseous ammonia, etc.) in the exhaust duct system 104.

[0029] The SCR 110 catalyst is configured to assist in reducing Petition 870250077872, dated 01 / 09 / 2025, pages 207 / 230 14 / 30 NOx emissions by accelerating a NOx reduction process between ammonia and exhaust NOx into diatomic nitrogen, water and / or carbon dioxide. The SCR catalyst 110 includes a fluidly coupled inlet to the decomposition chamber 108 from which the exhaust gas and reductant are received and a fluidly coupled outlet to one end of the exhaust duct system 104.

[0030] In some implementations, the DPF 106 may be positioned downstream of the decomposition chamber 108. For example, the DPF 106 and the SCR catalyst 110 may be combined into a single unit. In some implementations, the metering module 112 may instead be positioned downstream of a turbocharger or upstream of a turbocharger.

[0031] In several embodiments, the post-treatment system 100 also includes a mixing unit 138 (e.g., mixer, multi-stage mixer, etc.). The mixing assembly 138 is disposed between an upstream portion of the decomposition chamber 140 and a downstream portion of the decomposition chamber 142. Together, the upstream portion of the decomposition chamber 140, the mixing assembly 138, and the downstream portion of the decomposition chamber 142 form the decomposition chamber 108. The dosing module 112 is coupled to the mixing assembly 138, and the injector 120 is configured to dose the reducing agent into the mixing assembly 138. As will be explained in more detail in the present invention, the mixing assembly 138 functions to mix the exhaust gas received from the upstream portion of the decomposition chamber 140 with the reducing agent supplied by the mixing assembly 138 and to supply the exhaust gas that has been mixed with the reducing agent to the downstream portion of the decomposition chamber 142.

[0032] Although the after-treatment system 100 has been shown and described in the context of use with a diesel internal combustion engine, Petition 870250077872, dated 01 / 09 / 2025, pages 208 / 230 15 / 30 It is understood that the after-treatment system 100 can be used with other internal combustion engines, such as gasoline internal combustion engines, hybrid internal combustion engines, propane internal combustion engines and other similar internal combustion engines. Furthermore, other components or devices, not shown, may be included in the after-treatment system 100. III. First example of a pressure sensing assembly

[0033] Figures 2 and 3 illustrate an example pressure sensing assembly 152. The pressure sensing assembly 152 facilitates the measurement of exhaust gas pressure in an after-treatment system. As exhaust gases flow through the after-treatment system, it may be desirable to measure and monitor the exhaust backpressure, since increased backpressure levels can cause increased emissions and fuel consumption and negatively impact engine performance.

[0034] The pressure sensing assembly 152 includes a housing 210. The housing 210 is configured to house a plurality of exhaust aftertreatment components, such as a catalyst or the DPF 106. The housing 210 has a perimeter wall and is configured to receive exhaust gases through an inlet. The exhaust gas exits the housing 210 through an outlet. The perimeter wall includes an outer surface 212 and an inner surface 214. Brackets, clamps, or fasteners may be attached to the outer surface 212 to couple the housing 210 to an upstream exhaust duct at the inlet and to a downstream exhaust duct at the outlet. Other aftertreatment devices, such as sensors, may be mounted on the outer surface 212. The inner surface 214 defines a passage (e.g., cylindrical passage, cylindrical opening, etc.) within which the exhaust gases flow.The inner surface 214 further defines a housing width, with a length of 218 in Figure 3. Petition 870250077872, dated 01 / 09 / 2025, pp. 209 / 230 16 / 30 showing half of a housing width. The perimeter wall also includes a perimeter wall opening 216 that extends through the outer surface 212 and the inner surface 214 of the perimeter wall.

[0035] In several embodiments, the dimensions and geometry of the housing 210 can accommodate the after-treatment system and the components configured to be housed within the housing 210. In some embodiments, the housing 210 is arranged on top of (e.g., overlays, covers, etc.) a liner 217. In some embodiments, the housing can be made of several sections.

[0036] The pressure sensing assembly 152 also includes a tube assembly 200. As exhaust gas flows within the housing 210, the tube assembly 200 is configured to allow a pressure sensor to sample the exhaust gas flow, carrying exhaust gas to the pressure sensor. The tube assembly 200 includes a socket assembly 220. Figures 4 to 7 show the socket assembly 220 of Figures 2 to 3 in more detail. The socket assembly 220 is disposed within the housing passage 210 and is coupled to the housing to provide a sampling location to allow the pressure sensor to measure the pressure.

[0037] The fitting assembly 220 includes a fitting body 230. The fitting body 230 is inserted into the peripheral wall opening 216 and is coupled (e.g., welded, threaded, fixed) to the outer surface 212 of the housing 210. The fitting body 230 is defined by a fitting body height 237 from an upper surface 234 of the fitting body 230 to a lower surface 236 of the fitting body 230. The upper surface 234 defines the top of the fitting body 230 and is disposed above the outer surface 212 of the housing 210. The lower surface 236 defines the bottom of the fitting body 230 and is disposed below the inner surface 214 of the housing 210. The body Petition 870250077872, dated 01 / 09 / 2025, pp. 210 / 230 The 17 / 30 fitting 230 includes an inner surface 238 configured to receive and removablely couple with at least one mounting component (e.g., threaded fastener, pins, clips, notches, keying feature, etc.). In some embodiments, the mounting component is a nut 270. In these embodiments, the fitting body 230 includes a threaded fitting portion 239 along a portion of the inner surface 238 for threaded coupling with the nut 270. The fitting body 230 also includes a fitting body opening 232 that extends through the fitting body 230 from the lower surface 236 to the inner surface 238. The height of the fitting body 237 is large enough to allow space for the fitting body opening 232 and the inner surface 238.

[0038] In several embodiments, the fitting body 230 is configured so that the upper surface 234 is substantially parallel to the outer surface 212 of the housing 210. In some embodiments, the fitting body 230 is configured so that the upper surface 234 and the lower surface 236 are substantially parallel to each other. In some embodiments, the fitting body 230 is configured so that the inner surface 238 is angled or tapered relative to the upper surface 234 so that a mounting component can be press-fitted into the fitting body 230.

[0039] In some embodiments, the threaded fitting portion 239 is located along the entire circumference of the inner surface 238. In some embodiments, the threaded fitting portion 239 is located only on a portion or portions of the circumference of the inner surface 238. For example, the threaded fitting portion 239 may be arranged along half the circumference of the inner surface 238. In some embodiments, the threaded fitting portion 239 is arranged along the entire height of the inner surface 238. In some embodiments, the threaded fitting portion Petition 870250077872, dated 01 / 09 / 2025, pp. 211 / 230 18 / 30 is arranged along a portion of the height of the inner surface 238.

[0040] The fitting assembly 220 also includes a fitting tube 240. The fitting tube 240 extends from the lower surface 236 of the fitting body 230 along a longitudinal geometric axis 245 of the fitting tube 240 so that the fitting tube 240 is disposed in the passage of the housing 210. The fitting tube has a fitting tube length 248 from an inner end 244 of the fitting tube 240 located distal to the fitting body 230, to the lower surface 236 of the fitting body 230. The fitting tube 240 includes a fitting tube opening 242 at the inner end 244 of the fitting tube 240 configured to sample the exhaust gas flow. The fitting tube 240 contains exhaust gas that is stagnant relative to the exhaust gas flow moving around the fitting tube 240.The exhaust gas inside the fitting tube 240 compresses or decompresses based on the exhaust gas flow sampled through the fitting tube opening 242 so that the exhaust gas pressure inside the fitting tube 240 matches the exhaust gas flow pressure. By configuring the fitting tube 240 to be located within the exhaust gas flow in housing 210, the exhaust gas flow heats the fitting tube 240 as it flows through housing 210 to a temperature closer to the temperature of the exhaust gas flow and reduces the effects of thermophoresis on the opening of the fitting tube 242. As a result, at an insertion depth 246 measured from the inner end 244 of the fitting tube 240 to the inner surface 214 of housing 210, the opening of the fitting tube 242 is less susceptible to the formation of particulate deposits / blockages and can facilitate more uniform and accurate pressure readings by a pressure sensor.The insertion depth largely depends on the application and configuration of the pressure sensing assembly 152, such as the diameter of the fitting tube 240. In various embodiments, the insertion depth is... Petition 870250077872, dated 01 / 09 / 2025, pp. 212 / 230 19 / 30 between 20% and 80% of the housing width. In these embodiments, the fitting tube 240 extends into the housing passage 210 so that deposit formation is reduced and pressure sensor performance is improved.

[0041] In several embodiments, the fitting body 230 is integrally formed with the fitting tube 240 (e.g., cast, machined, etc.). In some embodiments, the fitting body 230 is integrally formed with the fitting tube by means of additive manufacturing. For example, the fitting assembly 220 can be integrally formed using 3D printing, selective laser sintering, selective laser melting (SLM), direct metal laser sintering (DMLS), electron beam melting (EBM), ultrasonic additive manufacturing (UAM), fused deposition modeling (FDM), fused filament fabrication (FFF), stereolithography (SLA), material blasting, binder blasting, or other similar processes.The 220 fitting body can be formed as part of a single manufacturing step (e.g., 3D printing, selective laser sintering, SLM, DMLS, EBM, UAM, FDM, FFF, SLA, material blasting, binder blasting, etc.) to create a single-piece or unitary construction that cannot be disassembled without at least partial destruction of the 220 fitting assembly. In some embodiments, the 230 fitting body and the 240 fitting tube are separate parts coupled (e.g., threaded, welded, brazed, etc.) together.

[0042] The 200 tube assembly also includes a 250 transport tube. The 250 transport tube is removablely coupled to the 220 fitting assembly. When coupled, the 250 transport tube fluidly couples the exhaust gas inside the fitting tube 240 to a pressure sensor. The pressure of the exhaust gas inside the fitting tube 240 and the 250 transport tube is the same. The tube of Petition 870250077872, dated 01 / 09 / 2025, pp. 213 / 230 The 20 / 30 transport 250 includes a transport tube opening 252 at an inner end 256 of the transport tube 250 distal to the fitting assembly 220. In various applications, it may be desirable to minimize the width difference between the transport tube opening 252 and the fitting tube opening 242 so as to avoid creating any sharp edges or protrusions that could collect particles or create turbulent flow, resulting in interrupted exhaust gas flow. Typical transport tubes are coupled (e.g., welded, brazed, threaded, etc.) to a housing and require a greater insertion depth into the housing (e.g., the length of the portion of the transport tube extending into the housing) to sample the exhaust gas. In contrast, the transport tube 250 may be positioned partially within the fitting body opening 232 and does not couple to the outer surface 212 of the housing 210.As a result of the 220 fitting assembly extending into the 210 housing instead of the 250 transport tube extending into the 210 housing, the 250 transport tube requires a shorter insertion depth compared to typical transport tubes. By decreasing the insertion depth of the 250 transport tube, the amount of space required to accommodate the 250 transport tube is significantly reduced, improving operability.

[0043] In various embodiments, the transport tube 250 is coupled to the fitting assembly 220 by a coupling tube 260 and nut 270. The coupling tube 260 and nut 270 removablely couple the transport tube 250 to the fitting body 230 so that the exhaust gas flows to the transport tube opening 252 to transport the exhaust gas to a pressure sensor. As a result, when servicing the transport tube 250, the transport tube 250 can be easily removed independently of the fitting assembly 220. The coupling tube 260 is arranged around the outside of the transport tube 250 and includes a Petition 870250077872, dated 01 / 09 / 2025, pp. 214 / 230 21 / 30 enlarged end 262 extending outward from its center. The enlarged end 262 is located at one end of the coupling tube 260 near the fitting body 230. In some embodiments, the coupling tube 260 may be welded or brazed to the transport tube 250. The nut 270 includes a nut opening 274 configured to receive the coupling tube 260 so that the nut 270 sits atop the enlarged end 262. When threaded onto the fitting body 230, the nut opening 274 aligns with the fitting body opening 232. The nut 270 also includes a threaded nut portion that is configured to be threaded onto the threaded fitting portion 239 along a portion of the inner surface 238 of the fitting body 230.To secure the transport tube 250 to the fitting body 230, the nut 270 is threaded onto the fitting body 230 so that the threaded portion of the nut engages with the threaded portion of the fitting 239 and compresses the enlarged end 262 against the inner surface 238 of the fitting body 230. As a result, the enlarged end 262 prevents exhaust gases flowing from the fitting tube 240 to the transport tube 250 from escaping through the opening of the fitting body 232.

[0044] In various embodiments, the transport tube 250 is coupled to a pressure sensor coupling (e.g., joint, adapter, bushing, etc.) (not shown) at an end opposite the inner end 256. In some embodiments, the pressure sensor coupling is welded to the transport tube 250. In other embodiments, the pressure sensor coupling is threaded into the inside of the transport tube 250. In still other embodiments, the pressure sensor coupling is press-fitted (e.g., through a friction fitting, etc.) into the transport tube 250. The pressure sensor coupling includes a configured pressure sensor coupling opening. Petition 870250077872, dated 01 / 09 / 2025, pages 215 / 230 22 / 30 to receive a pressure sensor, such as pressure sensor 148 in Figure 1.

[0045] Although the pressure sensing assembly 152 is shown and described as including the fitting tube 240 being circular with a constant diameter along the longitudinal geometric axis 245 of the fitting tube 240, it is understood that the cross-sectional shape of the fitting tube 240 taken perpendicular to the longitudinal geometric axis 245 of the fitting tube 240 may not be constant (e.g., tapered or varied along the fitting tube 240, etc.). Furthermore, it is understood that the cross-sectional shape of the fitting tube 240 taken perpendicular to the longitudinal geometric axis 245 of the fitting tube 240 may be oval in shape or a commonly available pipe shape.Similarly, while the fitting tube 240 is shown and described as extending from the lower surface 236 of the fitting body 230 along a longitudinal geometric axis 245 of the fitting tube 240, it is understood that the fitting tube 240 may extend along a curve or otherwise non-linearly so that pressure sensing is tailored to a target application. Furthermore, although the fitting body opening 232 and the fitting tube opening 242 are shown as coaxially aligned, it is understood that the fitting body opening 232 and the fitting tube opening 242 may not be coaxial.

[0046] Although the housing 210 is shown as cylindrical, it is understood that the housing may be oval, elliptical, polygonal, or otherwise similarly shaped, so that the pressure sensing assembly 152 is adjusted for a target application. Furthermore, it is understood that the inner surface 214 of the housing 210 may have a shape that is different from the shape of the outer surface 212 of the housing. IV. Second example of a pressure sensing assembly

[0047] Figures 8 and 9 illustrate a pressure detection assembly 152 Petition 870250077872, dated 01 / 09 / 2025, pp. 216 / 230 Example 23 / 30. The previously mentioned description of pressure sensing assembly 152 in relation to Figures 2 to 7 applies similarly to pressure sensing assembly 152 illustrated in Figures 8 and 9.

[0048] The pressure sensing assembly 152 is configured so that the transport tube opening 252 is not axially aligned with the fitting tube opening 242. The longitudinal geometric axis 245 of the fitting tube 240 is parallel to a central geometric axis 255 of the transport tube 250. The longitudinal geometric axis 245 of the fitting tube 240 is radially offset from the central geometric axis 255 of the transport tube 250 by an offset length 254 within the housing 210. In some applications, space constraints around the housing 210, as another component, may prevent the transport tube 250 from sampling exhaust gas at a desired location. The offset length 254 allows the transport tube to sample at the desired location.Furthermore, the displacement length 254 allows the pressure sensing assembly 152 to be accessible from different maintenance locations and allows the pressure sensing assembly 152 to be used with various exhaust aftertreatment systems (e.g., as aftertreatment system 100). For example, it may be desirable for the transport pipe 250 to be serviceable at a location along the housing 210 that has been designed to accommodate a pressure sensor. It may also be desirable for the fitting assembly 220 to sample at a different location within the housing 210.

[0049] As shown in Figures 8 and 9, the fitting body 230 is positioned within a perimeter wall opening 216 and coupled to the outer surface 212 of the housing 210. The perimeter wall opening 216 may be located at a location along the perimeter wall of the housing 210 chosen for operability. The fitting body 230 includes a Petition 870250077872, dated 01 / 09 / 2025, pp. 217 / 230 24 / 30 conduit (e.g., tube, channel, passage, etc.) that directs exhaust gas between the fitting tube 240 and the transport tube 250. The fitting tube 240 extends from the fitting body 230 to a sampling location within the housing passage 210 and is fluidly coupled to the transport tube 250 through the fitting body 230. In some embodiments, the conduit is space within the fitting body 230. In some embodiments, the conduit may be a separate component that is disposed within the fitting body 230. The fitting body 230 also defines the height of the fitting body 237 from the upper surface 234 to the lower surface 236. The height of the fitting body 237 is dimensioned so that the conduit can be disposed or defined within the fitting body 230. V. First example of the socket set

[0050] Figures 10 to 18 illustrate examples of 220 fitting assemblies and / or 240 fitting tubes of the 200 tube assembly with various cross-sections of the 240 fitting tube taken along a plane perpendicular to the longitudinal geometric axis 245 of the 240 fitting tube, according to various embodiments. The previous description of the 220 fitting assembly of the pressure sensing assembly 152 in relation to Figures 2 to 7 applies similarly to the 220 fitting assembly illustrated in Figures 10 to 18. Different cross-sections of the 240 fitting tube may be used depending on the desired sensor performance, qualities (e.g., velocity, temperature, etc.) of the exhaust gas, size limitations associated with the DPF 106 and / or the like.

[0051] Figures 10 to 13 illustrate an example of a 220 fitting assembly configured so that the fitting tube 240 has a non-constant cross-sectional shape. Unlike Figures 2 to 7, the fitting tube 240 has a circular cross-sectional shape close to the fitting body 230 and Petition 870250077872, dated 01 / 09 / 2025, pages 218 / 230 25 / 30 transitions to an oval cross-sectional shape at the inner end 244. In some embodiments, the circumference of the oval cross-sectional shape is substantially the same as the circumference of the circular cross-sectional shape. The fitting tube 240 can be configured so that the main geometric axis of the oval is along the direction of the exhaust gas flow. As a result of the oval cross-section, the exhaust gases can flow more smoothly around the fitting tube 240 and reduce backpressure, thus improving engine efficiency. Furthermore, the uniform circular cross-section near the fitting body 230 can allow the fitting body 230 and the fitting tube 240 to be more easily joined (e.g., by welding, brazing, etc.).

[0052] Figures 14 and 15 illustrate an example of a 240 fitting tube configured so that the 240 fitting tube has a teardrop cross-sectional shape. The 240 fitting tube has a teardrop cross-sectional shape along the length of the 240 fitting tube. The teardrop shape can be configured to reduce the flow separation of the exhaust gas as it flows around the 240 fitting tube. The reduction in flow separation around the 240 fitting tube results in a reduction in turbulent flow downstream of the 240 fitting tube, which can be advantageous for detecting various downstream exhaust gas characteristics. As a result of the reduced turbulent flow, the backpressure that can be caused by the 240 fitting tube is also reduced. In some embodiments, the teardrop shape includes a circular portion and a conical portion.

[0053] Figures 16 and 18 illustrate an example of a 240 fitting tube configured so that the 240 fitting tube is tapered. The 240 fitting tube has a circular cross-sectional shape with a first diameter 241 at a location along the longitudinal geometric axis 245 of the tube. Petition 870250077872, dated 01 / 09 / 2025, pages 219 / 230 26 / 30 of fitting 240 close to fitting body 230 and transitions to the second diameter 243 at a location opposite to the first location. The first diameter 241 is smaller than the second diameter 243. As a result of the second diameter 243 at the inner end 244 of fitting tube 240 being larger, the opening of fitting tube 242 is more open for escape, which may further decrease the formation of the deposit pattern. In some embodiments, the first diameter may be larger than the second diameter. VI. Second example of a set of interlocking parts

[0054] Figures 19 to 24 illustrate examples of socket assemblies 220 of the tube assembly 200 with multiple socket tubes 240 extending non-linearly from the lower surface 236 of the socket body 230, according to various embodiments. The preceding description of the socket assembly 220 of the pressure sensing assembly 152 in relation to Figures 2 to 7 applies similarly to the socket assembly 220 illustrated in Figures 19 to 24. In some applications, a straight socket tube 240 may not be feasible due to space constraints in the housing 210. In some embodiments, the socket tubes 240 include curved and / or bent portions to accommodate the geometry of the DPF 106. The socket tubes 240 may include curved and / or bent portions that allow the socket tube 240 to target a specific sampling location within the housing passage 210.Segmenting a sampling location within the passage allows the pressure in a specific area to be measured and monitored.

[0055] Figures 19 to 21 illustrate an example set of fittings 220 configured such that the fitting tube 240 defines a first linear portion, a bent portion, and a second linear portion. The first linear portion extends linearly away from the fitting body 230 such that a central geometric axis of the first linear portion is coaxial with the body opening. Petition 870250077872, dated 01 / 09 / 2025, pages 220 / 230 27 / 30 of fitting 232. The folded portion is contiguous to the first linear portion and the second linear portion and fluidly couples the second linear portion to the first linear portion and thus to the fitting body opening 232. The second linear portion extends away from the folded portion, opposite the first linear portion. The longitudinal geometric axis of the second linear portion is parallel to a central axis of the first linear portion. The longitudinal geometric axis of the second linear portion is offset from the central axis of the first linear portion in a direction perpendicular to the longitudinal geometric axis. The length of the first linear portion and the second linear portion may depend on the location of the folded portion. For example, if the folded portion is closer to the fitting body 230 than to the inner end 244, the second linear portion is longer than the first portion.If the bent portion is closer to the inner end 244 of the fitting tube 240 than to the fitting body 230, the first linear portion may be longer than the second portion. In some embodiments, the lengths of the first linear portion and the second linear portion are equal. In some embodiments, the fitting tube 240 defines only one bent portion and at most one of the first linear portion and the second linear portion.

[0056] Figures 22 to 24 illustrate an example socket set 220 configured such that the socket tube 240 defines a linear portion and a curved portion. In some embodiments, the socket tube 240 defines only a curved portion. The first linear portion extends away from the central geometric axis of the socket body opening 232 of the socket body 230. The first linear portion is contiguous to the curved portion, the curved portion extending away from the first linear portion opposite the socket body 230. In some embodiments, the curved portion curves in the same direction as the exhaust gas flows so that the socket tube opening 242 is downstream of the exhaust gas. VII. Construction of example modalities Petition 870250077872, dated 01 / 09 / 2025, pp. 221 / 230 28 / 30

[0057] Although this descriptive report contains many implementation-specific details, these should not be interpreted as limitations on the scope of what can be claimed, but rather as descriptions of specific features for specific implementations. Certain features described in this descriptive report, in the context of separate implementations, may also be implemented in combination in a single implementation. Conversely, several features described in the context of a single implementation may also be implemented in multiple implementations, separately or in any suitable subcombination. Furthermore, although features may be described as present in certain combinations and even initially claimed in that way, one or more features of a claimed combination may, in some cases, be removed from the combination, and the claimed combination may be directed to a subcombination or a variation of a subcombination.

[0058] As used in the present invention, the terms substantially, “generally,” “approximately,” and similar terms are intended to have a broad meaning and to be in harmony with the common and accepted usage of those skilled in the art to which the subject matter of this disclosure relates. Those skilled in the art reviewing the present disclosure should understand that these terms are intended to create a description of certain described and claimed features without restricting the scope of those features to the exact numerical ranges provided. Consequently, these terms should be interpreted as indicating that irrelevant or inconsequential modifications or alterations of the described and claimed subject matter are considered to be within the scope of the invention, as mentioned in the appended claims.

[0059] The term “coupled” and similar terms, as used herein, mean the union of two components directly or indirectly to one another. Such a union may be Petition 870250077872, dated 01 / 09 / 2025, pages 222 / 230 29 / 30 stationary (e.g., permanent) or mobile (e.g., removable or releasable). Such a union can be obtained when the two components or the two components and any additional intermediate components are integrally formed as a single unitary body with each other, when the two components or the two components and any additional intermediate components are fixed to each other.

[0060] The terms “fluidly coupled” and similar terms, as used herein, mean that there is a route between the two components or objects through which a fluid, such as air, exhaust gas, liquid reducer, gaseous reducer, aqueous reducer, gaseous ammonia, etc., can flow with or without intermediate components or objects. Examples of fluid couplings or configurations to enable fluid communication may include piping, channels, or any other components suitable for enabling the flow of a fluid from one component or object to another.

[0061] It is important to note that the construction and arrangement of the system shown in the various exemplary implementations are merely illustrative and not restrictive. It is intended that all changes and modifications that are within the spirit and / or scope of the implementations described be protected. It should be understood that some features may not be necessary and implementations lacking various features may be considered within the scope of the application, the scope of which is defined by the following claims. When the expression “a portion” is used, the item may include a portion and / or the entire item, except as otherwise specified.

[0062] Furthermore, the term “or” is used in its inclusive sense (and not in its exclusive sense) so that when used, for example to connect a list of elements, the term “or” means one, some, or all of the elements in the list. Conjunctive language such as the sentence “at least one of X, Y, and Z”, the Petition 870250077872, dated 01 / 09 / 2025, pp. 223 / 230 30 / 30, unless specifically stated otherwise, should be understood in context as generally used to represent that an item, term, etc., can be X, Y, Z, X and Y, X and Z, Y and Z, or X, Y and Z (that is, any combination of X, Y, and Z). Thus, such conjunctive language is not intended generically to imply that certain modalities require that at least one of each of X, at least one of Y, and at least one of Z be present, except where indicated otherwise.

[0063] Additionally, the use of value ranges (e.g., W to P, etc.) in the present invention includes their maximum and minimum values ​​(e.g., W to P includes W and includes P, etc.), except where otherwise indicated. Furthermore, a value range (e.g., W to P, etc.) does not necessarily require the inclusion of intermediate values ​​within the value range (e.g., W to P may include only W and P, etc.), except where otherwise indicated. Petition 870250077872, dated 01 / 09 / 2025, pages 224 / 230

Claims

1 / 6 CLAIMS 1. After-treatment system characterized by comprising: a housing having a perimeter wall, the perimeter wall having an outer surface and an inner surface, the inner surface defining a passage configured to receive an exhaust gas flow, the perimeter wall comprising a perimeter wall opening;and a set of tubes for pressure detection, the tube set comprising: a set of fittings comprising: a fitting body comprising a fitting body opening, an upper surface and a lower surface, the fitting body inserted within the peripheral wall opening and coupled to the outer surface, and a fitting tube extending from the lower surface and disposed in the passage, the fitting tube comprising a fitting tube opening at an inner end of the fitting tube, and a transport tube positioned partially within the fitting body opening and extending outward from the fitting body, the transport tube comprising a transport tube opening at an inner end of the transport tube.

2. Post-treatment system, according to claim 1, characterized in that the inner end of the fitting tube is separated from the inner surface by a distance between 20% and 80% of the passage width.

3. Post-treatment system, according to claim 1, characterized in that the length of the fitting tube along a longitudinal geometric axis of the fitting tube is greater than the distance between the upper surface and the lower surface.

4. Post-treatment system, according to claim 1, Petition 870250077872, dated 01 / 09 / 2025, pp. 225 / 230 2 / 6, characterized by further comprising: a coupling tube disposed around the transport tube, the third tube comprising an enlarged end; and a nut disposed between the coupling tube and the fitting body, the nut threaded onto the fitting body and compressing the enlarged end against the fitting body.

5. Post-treatment system, according to claim 1, characterized in that at least one of the following is true: the fitting tube is integrally formed with the fitting body; the fitting tube is threaded onto the fitting body; the fitting tube is welded to the fitting body; the fitting tube is brazed to the fitting body; or the fitting tube is press-fitted onto the fitting body.

6. Post-treatment system, according to claim 1, characterized in that the fitting tube has a longitudinal geometric axis and the fitting tube has an oval shape along a cross-section of the fitting tube taken perpendicular to the longitudinal geometric axis.

7. Post-treatment system, according to claim 1, characterized in that: the fitting tube is defined by a first diameter at a first location close to the fitting body and a second diameter at a second location opposite the first location; and the first diameter is different from the second diameter.

8. Pressure sensing tube assembly, the pressure sensing tube assembly being characterized by comprising: a set of fittings comprising: a fitting body comprising a fitting body opening, Petition 870250077872, dated 01 / 09 / 2025, p. 226 / 230 3 / 6 an upper surface and a lower surface, and a fitting tube extending from the lower surface, the fitting tube comprising a fitting tube opening at an inner end of the fitting tube, the inner end distal to the fitting body; a coupling tube comprising an enlarged end; and a nut disposed between the coupling tube and the fitting body, the nut configured to be threaded onto the fitting body to compress the enlarged end against the fitting body.

9. A set of tubes according to claim 8, characterized in that the length of the fitting tube along a longitudinal geometric axis of the fitting tube is greater than the distance between the upper surface and the lower surface.

10. Assembly of tubes, according to claim 8, characterized in that the opening of the fitting tube is aligned with the opening of the fitting body at the inner end of the fitting tube.

11. A set of tubes according to claim 8, further characterized by comprising: a transport tube configured to be positioned partially within the body opening of the fitting, the transport tube comprising a transport tube opening configured to sample exhaust gas; and a pressure sensor coupling configured to be coupled to the transport tube, the pressure sensor coupling comprising a pressure sensor coupling opening configured to receive a pressure sensor.

12. Assembly of tubes, according to claim 8, characterized in that at least one of the following is true: the fitting tube being integrally formed with the fitting body; Petition 870250077872, dated 01 / 09 / 2025, p. 227 / 230 4 / 6 the fitting tube being threaded onto the fitting body; the fitting tube being welded to the fitting body; the fitting tube being brazed to the fitting body; or the fitting tube being press-fitted onto the fitting body.

13. A set of tubes according to claim 8, characterized in that the fitting tube has a longitudinal geometric axis and the fitting tube has an oval shape along a cross-section of the fitting tube taken perpendicular to the longitudinal geometric axis.

14. A set of tubes according to claim 8, characterized in that: the fitting tube is defined by a first diameter at a first location close to the fitting body and a second diameter at a second location opposite the first location; and the first diameter is different from the second diameter.

15. Set of fittings for a set of tubes for pressure detection characterized in that the fitting comprises: a fitting body comprising: a fitting body opening that is not threaded, an upper surface; a lower surface and an inner surface comprising a threaded fitting portion; a fitting tube extending from the lower surface of the fitting body, the fitting tube comprising a fitting tube opening at an inner end of the fitting tube, the inner end distal to the fitting body; and a nut comprising: a nut insertion portion comprising a threaded nut portion that is configured to be threaded onto the Petition 870250077872, dated 01 / 09 / 2025, p.228 / 230 5 / 6 threaded socket, and a nut opening that is not threaded and is configured to be aligned with the socket body opening when the threaded portion of the nut is threaded onto the threaded socket portion.

16. A set of fittings according to claim 15, characterized in that the length of the fitting tube along a longitudinal geometric axis of the fitting tube is greater than the distance between the upper surface and the lower surface.

17. A set of fittings according to claim 15, characterized in that the opening of the fitting tube is aligned with the opening of the fitting body at the inner end of the fitting tube.

18. A set of fittings according to claim 15, characterized in that at least one of the following features is present: the fitting tube being integrally formed with the fitting body; the fitting tube being threaded onto the fitting body; the fitting tube being welded to the fitting body; the fitting tube being brazed to the fitting body; or the fitting tube being press-fitted into the fitting body.

19. A set of fittings according to claim 15, characterized in that the fitting tube has a longitudinal geometric axis and the fitting tube has an oval shape along a cross-section of the fitting tube taken perpendicular to the longitudinal geometric axis.

20. A set of fittings according to claim 15, characterized in that: the fitting tube is defined by a first diameter at a first location close to the fitting body and a second diameter at a second location opposite the first location; and Petition 870250077872, dated 01 / 09 / 2025, pp. 229 / 230 6 / 6 the first diameter is different from the second diameter.

21. Product, process, system, kit, means or use, characterized by comprising one or more elements described in the descriptive report, claims, drawings, sequence listing, or summary of this application, when applicable. Petition 870250077872, dated 01 / 09 / 2025, pp. 230 / 230

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