Gas metering valve with pressure stabilizing function

Abstract

The invention provides a gas metering valve with a pressure stabilizing function, which comprises a valve seat, a valve cover, a pressure reducing valve module, a metering module and a pilot-operated cut-off valve module, the pressure reducing valve module is arranged in the middle of the valve seat, and the upper end of the pressure reducing valve module is sealed by the valve cover; the two metering modules are symmetrically arranged on the two sides of the pressure reducing valve module. A pilot-operated type stop valve module is arranged on the side face of the valve seat between the two metering modules, an air inlet is formed in the valve seat close to the pilot-operated type stop valve module, and an air outlet is formed in the valve seat far away from the pilot-operated type stop valve module. The gas metering valve integrates the functions of a pressure reducing valve, a metering valve and a stop valve, the pressure loss between the pressure reducing valve and the metering valve is greatly reduced technically, and meanwhile, the cost of customers is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of gas metering valves, and in particular to a gas metering valve with a pressure stabilizing function. Background Art

[0002] Gas engines are engines that use various gaseous fuels. The control of the intake volume directly affects its working state. If the intake volume is too small, the mixed concentration cannot meet the combustion requirements, and ignition cannot be achieved, or even after ignition, the stable output of engine kinetic energy cannot be guaranteed; if the intake volume is too large, a large amount of exhaust gas will be generated due to incomplete combustion, causing pollution. Therefore, it is necessary to measure and control the intake volume, so as to achieve the control of the intake volume through the engine control system to ensure the working state of the engine.

[0003] After the engine gas comes out of the LNG / CNG tank, the outlet pressure needs to be stabilized within a certain range, and then the engine intake volume is controlled by the gas intake volume. At present, the outlet pressure is controlled by a gas pressure reducing valve, and the gas intake volume is controlled by a metering valve. For example, the invention patent with the authorization announcement number CN219974649U discloses a structure of a gas pressure reducing valve, but the gas pressure reducing valve also needs to be equipped with a corresponding gas metering valve when in use. Both components are separate and work separately, which increases the number of components, complicates the gas pipeline design, and makes it difficult to ensure control accuracy. Multiple components also increase the overall cost. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a gas metering valve with a pressure stabilizing function.

[0005] The technical solution to be adopted by the present invention to solve its technical problems is: a gas metering valve with a pressure stabilizing function, comprising a valve seat, a valve cover, a pressure reducing valve module, a metering module and a pilot cut-off valve module, wherein the valve seat is provided with a first channel, a piston cavity, a valve stem cavity, a second channel, a third channel, a fourth channel, a fifth channel and a metering cavity, the pressure reducing valve module is arranged in the middle of the valve seat, and the upper end is sealed by the valve cover; the pressure reducing valve module comprises a pressure reducing valve piston assembly, a pressure reducing valve stem and a diaphragm assembly, wherein the pressure reducing valve piston assembly is located in the piston cavity, the pressure reducing valve stem is located in the valve stem cavity, the lower end of the pressure reducing valve stem is connected to the pressure reducing valve piston assembly, and the upper end is connected to the diaphragm assembly; there are multiple metering cavities, each metering cavity is provided with a metering module, and the metering module is Two groups are symmetrically arranged on both sides of the pressure reducing valve module; a pilot cut-off valve module is provided on the side of the valve seat between the two groups of metering modules, an air inlet is provided on the valve seat close to the pilot cut-off valve module, and an air outlet is provided on the valve seat far away from the pilot cut-off valve module; the pressure reducing valve module stabilizes the pressure of the gas entering the air inlet, controls the amount of engine air intake through the metering module, and after the pressure of the gas is stabilized by the pressure reducing valve module, the gas enters the metering module again, which can ensure the accuracy of the measurement of the metering module, thereby ensuring precise control of the amount of air intake and avoiding affecting the performance of the gas engine; the air intake end of the pressure reducing valve module controls the air intake end through the pilot cut-off valve module controller, and introduces a flow compensation design to make the control more precise.

[0006] The air inlet is connected to one end of the first channel through the cut-off valve piston assembly of the pilot cut-off valve module, and the other end of the first channel is connected to the piston chamber. The piston chamber is located below the valve stem chamber, and the two are connected to each other. There are two second channels, which are radially symmetrically arranged at both ends of the valve stem chamber. One end of the second channel is connected to the valve stem chamber, and the other end is radially extended outward and connected to the third channel. The third channel on each side is connected to the upper end of the metering chamber where a group of metering modules are located on the same side. There are two fifth channels, which are respectively arranged below the two third channels, and the lower end of the metering chamber on the same side is connected to the fifth channel on the same side. The fourth channel is arranged at one end of the fifth channel, and the two fifth channels are both connected to the fourth channel, and the end of the fourth channel is connected to the air outlet.

[0007] Furthermore, the downstream of the pressure reducing valve module is used to provide gas to the metering module. In order to improve the accuracy of the metering module, it also includes a pressure and temperature sensor, which is arranged on the valve seat. The valve seat is provided with a sixth channel, which is connected to the first diaphragm cavity through the sixth channel. The first diaphragm cavity is located above the valve stem cavity, and a diaphragm assembly is provided inside the first diaphragm cavity. The pressure and temperature in the first diaphragm cavity downstream of the pressure reducing valve module are monitored by the pressure and temperature sensor, and the pressure and temperature data are provided to the control unit. The control unit can control and adjust the opening of the metering module according to the pressure and temperature values, so as to achieve the effect of accurately controlling the flow.

[0008] Preferably, the third channels on both sides of the valve body are mirror-symmetrical in the cross section of the valve seat.

[0009] Preferably, the fifth channels on both sides of the valve body are mirror-symmetrical in the cross section of the valve seat.

[0010] Further, each group includes a plurality of metering modules, and the plurality of metering modules are arranged along the circumference. According to the size of the engine power, the metering modules can be increased or decreased as required, and preferably, each group of metering modules can be 3-4, which is convenient for circumferential distribution.

[0011] Specifically, the overall shape of the valve seat is cylindrical, which facilitates the circumferential distribution of multiple metering modules.

[0012] Furthermore, in order to meet the demand for large flow, a compensation structure is also included, which includes a seventh channel arranged in the valve body, one end of the seventh channel is connected to the fourth channel, and the other end is connected to the second diaphragm cavity in the valve cover, and the second diaphragm cavity is located above the diaphragm assembly of the pressure reducing valve module.

[0013] Specifically, the pilot cut-off valve module includes a cut-off valve assembly, a connector and a three-way solenoid valve assembly, wherein the cut-off valve piston assembly is arranged in a cut-off valve cavity between the air inlet and the first channel, the three-way solenoid valve assembly is arranged in a solenoid valve cavity on one side of the cut-off valve assembly, the three-way solenoid valve assembly has an air inlet, a second air outlet and a third air outlet, the high-pressure gas entering from the air inlet is connected to the air inlet of the three-way solenoid valve assembly through a first process hole arranged in the valve seat, the third air outlet is connected to the back side of the cut-off valve assembly through a second process hole arranged in the valve seat, and the second air outlet is connected to the air outlet through a third process hole arranged in the valve seat; the cut-off valve assembly and the three-way solenoid valve assembly are sealed in the cut-off valve cavity and the solenoid valve cavity of the valve seat by a side cover.

[0014] The beneficial effects of the present invention are as follows: the gas metering valve with a pressure stabilizing function provided by the present invention (1) integrates the functions of a pressure reducing valve and a metering valve, technically greatly reduces the pressure loss between the pressure reducing valve and the metering valve, and also reduces the cost of customers; (2) introduces a flow compensation design: under high load conditions, the metering module requires more gas, and at the same time, a very high back pressure is generated downstream of the metering module, but the outlet pressure of the pressure reducing valve module is constant (the throttling area is constant), and more gas cannot be provided under high load. After the compensation design is introduced through the seventh channel, the pressure downstream of the metering module can directly act on the diaphragm of the pressure reducing valve module, so that the main piston of the pressure reducing valve module moves in the opening direction, thereby increasing the flow output and meeting the demand for more gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a three-dimensional structural schematic diagram of a gas metering valve with a pressure stabilizing function according to the present invention.

[0017] Figure 2 It is a schematic diagram of the top view of the structure of the gas metering valve with a pressure stabilizing function of the present invention.

[0018] Figure 3 It is a side structural schematic diagram of the gas metering valve with a pressure stabilizing function of the present invention.

[0019] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure of AA.

[0020] Figure 5 yes Figure 2 Schematic diagram of the cross-sectional structure of BB.

[0021] Figure 6 yes Figure 2 Schematic diagram of the cross-sectional structure of CC.

[0022] Figure 7 yes Figure 3 Schematic diagram of the airflow in the cross section of FF.

[0023] Figure 8 yes Figure 2 Schematic diagram of the airflow in the cross section of AA.

[0024] Fig. 9 yes Figure 2 Schematic diagram of the airflow in the cross section of BB.

[0025] Fig.10 yes Figure 3 Schematic diagram of the airflow in the cross section of DD.

[0026] Fig.11 yes Figure 3 Schematic diagram of the airflow in the cross section of EE.

[0027] In the figure: 1. valve seat, 1.1. first channel, 1.2. piston chamber, 1.3. valve stem chamber, 1.4. second channel, 1.5. third channel, 1.6. fourth channel, 1.7. first diaphragm chamber, 1.8. fifth channel, 1.9. sixth channel, 1.10. metering chamber, 1.11. seventh channel, 2. air inlet, 3. air outlet, 4. pressure reducing valve module, 4.1. pressure reducing valve piston assembly, 4.2. first return spring, 4.3. pressure reducing valve stem, 4.4. second return spring, 4.5, diaphragm assembly, 5, metering module, 5.1, electrical interface, 5.2, upper shell, 5.3, lower shell, 5.4, flange seat, 5.5, iron core, 5.6, coil frame, 5.7, ejector pin, 5.8, third return spring, 5.9, metal ring, 5.10, travel ring, 5.11, sealing seat, 5.12, air outlet nozzle, 5.13, air intake filter, 6, pressure and temperature sensor, 7, pilot shut-off valve module, 7.1, shut-off valve assembly, 7.11, sealing buffer pad, 7.12, shut-off valve core, 7.13, fourth return spring, 7.2, connector, 7.3, three-way solenoid valve assembly, 8, valve cover, 8.1, second diaphragm chamber. DETAILED DESCRIPTION

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0029] like Figure 1-Figure 6As shown, a gas metering valve with a pressure stabilizing function of the present invention comprises a valve seat 1, a valve cover 8, a pressure reducing valve module 4, a metering module 5 and a pilot cut-off valve module 7, wherein the overall shape of the valve seat 1 is cylindrical. The cylindrical shape facilitates the circumferential distribution of multiple metering modules 5; the valve seat 1 is provided with a first channel 1.1, a piston cavity 1.2, a valve stem cavity 1.3, a second channel 1.4, a third channel 1.5, a fourth channel 1.6, a fifth channel 1.8 and a metering cavity 1.10, the pressure reducing valve module 4 is arranged in the middle of the valve seat 1, and the upper end is sealed by a valve cover 8; the pressure reducing valve module 4 includes a pressure reducing valve piston assembly 4.1, a pressure reducing valve stem 4.3 and a diaphragm assembly 4.5, wherein the pressure reducing valve piston assembly 4.1 is located in the piston cavity 1.2, the pressure reducing valve stem 4.3 is located in the valve stem cavity 1.3, and its lower end is connected to the pressure reducing valve piston assembly 4.1, and its upper end is connected to the diaphragm assembly 4.5; there are multiple metering cavities 1.10, each metering cavity 1.10 is provided with a metering module 5, and the metering modules 5 are in two groups, which are symmetrically arranged on both sides of the pressure reducing valve module 4; in this embodiment, each group includes three metering modules 5, and the three metering modules 5 are arranged along the circumference, and the number of each group includes but is not limited to three. A pilot cut-off valve module 7 is provided on the side of the valve seat 1 between the two groups of metering modules 5, an air inlet 2 is provided on the valve seat 1 close to the pilot cut-off valve module 7, and an air outlet 3 is provided on the valve seat 1 away from the pilot cut-off valve module 7; the pressure reducing valve module 4 stabilizes the pressure of the gas entering the air inlet 2, controls the size of the engine intake through the metering module 5, and after the pressure of the gas is stabilized by the pressure reducing valve module 4, the gas enters the metering module 5 again, which can ensure the accuracy of the measurement of the metering module 5, thereby ensuring precise control of the size of the intake volume and avoiding affecting the performance of the gas engine; the intake end of the pressure reducing valve module 4 controls the intake situation of the intake end through the pilot cut-off valve module 7 controller, and introduces a flow compensation design to make the control more precise. The air inlet 2 is connected to one end of the first channel 1.1 through the cut-off valve piston assembly of the pilot cut-off valve module 7, and the other end of the first channel 1.1 is connected to the piston chamber 1.2. The piston chamber 1.2 is located below the valve stem chamber 1.3, and the two are connected to each other. There are two second channels 1.4, which are radially symmetrically arranged at both ends of the valve stem chamber 1.3. One end of the second channel 1.4 is connected to the valve stem chamber 1.3, and the other end is radially extended outward and connected to the third channel 1.5. The third channel 1.5 on each side is connected to the upper end of the metering chamber 1.10 where a group of metering modules 5 are located on the same side. The third channels 1.5 on both sides of the valve body are mirror-symmetrical in the cross section of the valve seat 1. There are two fifth channels 1.8, which are respectively arranged below the two third channels 1.5. The lower end of the metering cavity 1.10 on the same side is connected to the fifth channel 1.8 on the same side. The fourth channel 1.6 is arranged at one end of the fifth channel 1.8, and the two fifth channels 1.8 are both connected to the fourth channel 1.6. The end of the fourth channel 1.6 is connected to the air outlet 3.The fifth channels 1.8 on both sides of the valve body are mirror-symmetrical in the cross section of the valve seat 1.

[0030] The downstream of the pressure reducing valve module 4 is used to provide gas to the metering module 5. In order to improve the accuracy of the metering module 5, it also includes a pressure and temperature sensor 6. The pressure and temperature sensor 6 is arranged on the valve seat 1. The valve seat 1 is provided with a sixth channel 1.9, which is connected to the first diaphragm cavity 1.7 through the sixth channel 1.9. The first diaphragm cavity 1.7 is located above the valve stem cavity 1.3. The first diaphragm cavity 1.7 is provided with a diaphragm assembly 4.5. The pressure and temperature in the first diaphragm cavity 1.7 downstream of the pressure reducing valve module 4 are monitored by the pressure and temperature sensor 6, and the pressure and temperature data are provided to the control unit. The control unit can control and adjust the opening of the metering module 5 according to the pressure and temperature values, so as to achieve the effect of accurately controlling the flow. In this embodiment, in order to facilitate assembly, the pressure and temperature sensor 6 is arranged on the valve seat 1 on one side of the pilot cut-off valve module 7.

[0031] like Figure 5 As shown, the figure mainly shows the schematic diagram of the internal structure of the pressure reducing valve module 4 and the metering module 5. The pressure reducing valve module 4 mainly includes a piston cover, a pressure reducing valve piston assembly 4.1, a first return spring 4.2, a pressure reducing valve rod 4.3 (i.e., a piston shaft), a second return spring 4.4, a diaphragm assembly 4.5, a spring support seat and an adjusting screw. The structure and connection relationship thereof refer to the structure of the piston assembly disclosed in the invention patent with the authorization announcement number CN219974649U; the metering module 5 mainly includes an electrical interface 5.1, upper shell 5.2, lower shell 5.3, flange seat 5.4, iron core 5.5, coil skeleton 5.6, ejector pin 5.7, third return spring 5.8, metal ring 5.9, travel ring 5.10, sealing seat 5.11, air outlet nozzle 5.12, air intake filter 5.13 and multiple sealing rings, etc., its structure and connection relationship refer to the structure of the gas nozzle disclosed in the invention patent with authorization announcement number CN114233528B; therefore, the above two parts of the structure are not repeated here.

[0032] like Figure 6As shown, a compensation structure is also added between the downstream of the metering module 5 and the pressure reducing valve module 4, and the compensation structure includes a seventh channel 1.11 arranged in the valve body, one end of the seventh channel 1.11 is connected to the fourth channel 1.6, and the other end is connected to the second diaphragm cavity 8.1 in the valve cover 8, and the second diaphragm cavity 8.1 is located above the diaphragm assembly 4.5 of the pressure reducing valve module 4. The gas in the fourth channel 1.6 acts on the second diaphragm cavity 8.1 of the diaphragm assembly 4.5 through the seventh channel 1.11, so that the main piston of the pressure reducing valve module 4 moves in the opening direction, thereby increasing the output of the flow and realizing the flow compensation. A spring cavity is provided in the valve cover 8 above the second diaphragm cavity 8.1, and the second return spring 4.4 is provided in the spring cavity.

[0033] like Figure 7 As shown, the pilot cut-off valve module 7 includes a cut-off valve assembly 7.1, a connector 7.2 and a three-way solenoid valve assembly 7.3, wherein the cut-off valve piston assembly is arranged in the cut-off valve cavity between the air inlet 2 and the first channel 1.1, the three-way solenoid valve assembly 7.3 is arranged in the solenoid valve cavity on one side of the cut-off valve assembly 7.1, the three-way solenoid valve assembly 7.3 has an air inlet hole, a second air outlet hole and a third air outlet hole, the high-pressure gas entering from the air inlet 2 is connected to the air inlet hole of the three-way solenoid valve assembly 7.3 through the first process hole arranged in the valve seat 1, the third air outlet hole is connected to the back of the cut-off valve assembly 7.1 through the second process hole arranged in the valve seat 1, and the second air outlet hole is connected to the air outlet 3 through the third process hole arranged in the valve seat 1; the cut-off valve assembly 7.1 and the three-way solenoid valve assembly 7.3 are sealed in the cut-off valve cavity and the solenoid valve cavity of the valve seat 1 through the side cover. The cut-off valve assembly 7.1 mainly includes components such as a sealing cushion, a cut-off valve core and a fourth reset spring. The structure and connection relationship of the pilot shut-off valve module 7 refer to the gas pressure reducing valve with a pilot gas shut-off valve disclosed in the invention patent with application number CN202421746080.0, in which the shut-off valve assembly and the three-way solenoid valve assembly respectively correspond to the structure and connection relationship of the shut-off valve assembly 7.1 and the three-way solenoid valve assembly 7.3 in the present invention, and therefore, they will not be described in detail here.

[0034] The gas line connecting pipe system is as follows: Figure 7 As shown, the air inlet 2 is connected to one end of the first channel 1.1 through the cut-off valve piston assembly, and the other end of the first channel 1.1 extends radially and communicates with the side of the piston cavity 1.2 in the middle of the valve seat 1, as shown in FIG. Figure 8 and Fig. 9 As shown, the upper end of the piston cavity 1.2 is connected to the valve stem cavity 1.3, and two groups of metering modules 5 are symmetrically arranged on the valve seat 1 on both sides of the valve stem cavity 1.3 along the radial direction. Fig.10As shown, the valve stem cavity 1.3 is connected to the metering module 5 through the second channel 1.4 and the third channel 1.5, wherein one end of the second channel 1.4 is connected to the valve stem cavity 1.3, and the other end is connected to the third channel 1.5 along the radially outwardly extending end, and the third channel 1.5 on each side is connected to a group of metering modules 5. In this embodiment, the third channels 1.5 on both sides are straight channels, and the angle α between them is 20°. The shape and angle of the third channel 1.5 include but are not limited to the above-mentioned straight channel and 20°, which can be set according to the needs and the arrangement of the metering modules 5; Fig.11 As shown, a fourth channel 1.6 connected to the air outlet 3 is provided at the lower portion of the valve seat 1, and two fifth channels 1.8 connected to the fourth channel 1.6 are provided. The two fifth channels 1.8 are respectively provided directly below the two third channels 1.5. The third channel 1.5 is used to connect the airflow of the upper end of the metering chamber 1.10 with the air intake direction pressure reducing valve module 4. The fifth channel 1.8 is used to connect the lower end of the metering chamber 1.10 and connect with the fourth channel 1.6 to realize the outflow of the airflow. In this embodiment, the fourth channel 1.6 is provided on the left side of the valve seat 1.

[0035] Working principle: like Figure 6-Figure 11 As shown by the red arrow, the gas flows from Figure 7 The air inlet 2 enters along direction A, passes through the cut-off valve assembly 7.1, enters the first channel 1.1, and then enters the piston chamber 1.2 along direction B; Figure 8 As shown, the airflow passes through the pressure reducing valve piston assembly 4.1 and flows upward in the direction C and enters the valve stem cavity 1.3; Fig. 9 As shown, the gas in the valve stem cavity 1.3 enters the second channel 1.4 along the direction D; Fig.10 As shown, the gas enters the third channel 1.5 after passing through the second channel 1.4, and enters the upstream of the metering module 5 through the third channel 1.5. The gas upstream of the metering module 5 flows downward and is ejected through the nozzle; Fig.11 As shown, the gas sprayed from the nozzle enters the fifth channel 1.8, and the gas in the fifth channels 1.8 on both sides flows into the fourth channel 1.6 along the E direction and merges, and the merged gas flows out from the gas outlet 3 along the F direction.

[0036] At the same time, the pressure and temperature sensor 6 monitors the temperature and pressure in the first diaphragm chamber 1.7 and provides the signals to the control unit, which controls the opening of the metering module 5 according to the signals; Figure 6 As shown, when the gas volume increases, the gas in the fourth channel 1.6 generates a very high back pressure, and its pressure increases. Under the action of the back pressure, the gas passes through the seventh channel 1.11 along the G direction to compensate to the second diaphragm chamber 8.1 of the pressure reducing valve module 4, thereby making the pressure reducing valve piston open wider and increasing the flow output.

[0037] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A gas metering valve with a pressure stabilizing function, characterized in that: It comprises a valve seat, a valve cover, a pressure reducing valve module, a metering module and a pilot cut-off valve module, wherein the valve seat is provided with a first channel, a piston cavity, a valve stem cavity, a second channel, a third channel, a fourth channel, a fifth channel and a metering cavity, the pressure reducing valve module is arranged in the middle of the valve seat, and the upper end is sealed by the valve cover; the pressure reducing valve module comprises a pressure reducing valve piston assembly, a pressure reducing valve stem and a diaphragm assembly, wherein the pressure reducing valve piston assembly is located in the piston cavity, the pressure reducing valve stem is located in the valve stem cavity, the lower end of the pressure reducing valve stem is connected to the pressure reducing valve piston assembly, and the upper end is connected to the diaphragm assembly; there are multiple metering cavities, each metering cavity is provided with a metering module, and the metering modules are in two groups, which are symmetrically arranged on both sides of the pressure reducing valve module; a pilot cut-off valve module is arranged on the side of the valve seat between the two groups of metering modules, an air inlet is arranged on the valve seat close to the pilot cut-off valve module, and an air outlet is arranged on the valve seat away from the pilot cut-off valve module; The air inlet is connected to one end of the first channel through the cut-off valve piston assembly of the pilot cut-off valve module, and the other end of the first channel is connected to the piston chamber. The piston chamber is located below the valve stem chamber, and the two are connected to each other. There are two second channels, which are radially symmetrically arranged at both ends of the valve stem chamber. One end of the second channel is connected to the valve stem chamber, and the other end is radially extended outward and connected to the third channel. The third channel on each side is connected to the upper end of the metering chamber where a group of metering modules are located on the same side. There are two fifth channels, which are respectively arranged below the two third channels, and the lower end of the metering chamber on the same side is connected to the fifth channel on the same side. The fourth channel is arranged at one end of the fifth channel, and the two fifth channels are both connected to the fourth channel, and the end of the fourth channel is connected to the air outlet.

2. The gas metering valve with pressure stabilization function as claimed in claim 1, characterized in that: It also includes a pressure and temperature sensor, which is arranged on the valve seat. A sixth channel is arranged in the valve seat and connected to the first diaphragm cavity through the sixth channel. The first diaphragm cavity is located above the valve stem cavity. A diaphragm assembly is arranged inside the first diaphragm cavity.

3. The gas metering valve with pressure stabilization function as claimed in claim 2, characterized in that: The third channels on both sides of the valve body are mirror-symmetrical in the cross section of the valve seat.

4. The gas metering valve with pressure stabilization function as claimed in claim 2, characterized in that: The fifth channels on both sides of the valve body are mirror-symmetrical in the cross section of the valve seat.

5. The gas metering valve with pressure stabilization function as claimed in claim 1, characterized in that: Each group includes a plurality of metering modules, and the plurality of metering modules are arranged along a circumference.

6. The gas metering valve with pressure stabilization function according to claim 1, characterized in that: The valve seat is cylindrical in shape as a whole.

7. The gas metering valve with pressure stabilization function according to any one of claims 1 to 6, characterized in that: It also includes a compensation structure, which includes a seventh channel arranged in the valve body, one end of the seventh channel is connected to the fourth channel, and the other end is connected to the second diaphragm cavity in the valve cover, and the second diaphragm cavity is located above the diaphragm assembly of the pressure reducing valve module.

8. The gas metering valve with pressure stabilization function as claimed in claim 1, characterized in that: The pilot cut-off valve module includes a cut-off valve assembly, a connector and a three-way solenoid valve assembly, wherein the cut-off valve piston assembly is arranged in a cut-off valve cavity between the air inlet and the first channel, the three-way solenoid valve assembly is arranged in a solenoid valve cavity on one side of the cut-off valve assembly, the three-way solenoid valve assembly has an air inlet, a second air outlet and a third air outlet, the high-pressure gas entering from the air inlet is connected to the air inlet of the three-way solenoid valve assembly through a first process hole arranged in the valve seat, the third air outlet is connected to the back side of the cut-off valve assembly through a second process hole arranged in the valve seat, and the second air outlet is connected to the air outlet through a third process hole arranged in the valve seat; the cut-off valve assembly and the three-way solenoid valve assembly are sealed in the cut-off valve cavity and the solenoid valve cavity of the valve seat through a side cover.

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