Gas metering valve with pressure stabilizing function

Abstract

The gas metering valve with the pressure stabilizing function comprises a valve seat, a valve cover, a pressure reducing valve module, a metering module and a pilot-operated type stop 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 through 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 utility model relates to gas metering valve technical field, in particular to a kind of gas metering valve with pressure stabilizing function. BACKGROUND

[0002] Gas engine is the engine using various gas fuel to work.The control of air intake quantity directly influences its working state, if air intake quantity is too little, mixed concentration reaches the requirement of combustion, then cannot realize ignition, or even after ignition, also cannot guarantee the stable output of engine power;If air intake quantity is too much, again due to combustion is not sufficient, produce a large amount of tail gas, cause pollution, therefore, need to carry out metering control to air intake quantity, to realize the control of air intake quantity by engine control system, to guarantee engine working state.

[0003] After engine gas comes out from LNG / CNG gas tank, need to stabilize the outlet pressure in certain range, then, the size of engine air intake quantity is controlled by gas air intake quantity, currently, outlet pressure is controlled using gas pressure reducing valve, and gas air intake quantity is controlled using metering valve, such as authorized announcement No.CN219974649U utility model patent discloses the structure of a kind of gas pressure reducing valve, but the gas pressure reducing valve needs to be equipped with corresponding gas metering valve when using, two components are separate, and work separately, both increase component quantity, make gas pipeline design complexification, difficult to guarantee control precision, and multiple components increase the overall cost. CONTENT OF UTILITY MODEL

[0004] The utility model solves the technical problems: in order to overcome the deficiency in the prior art, the utility model provides a kind of gas metering valve with pressure stabilizing function.

[0005] The utility model solves its technical problem adopts the technical scheme that a kind of gas metering valve with pressure stabilizing function, including valve seat, valve cover, pressure reducing valve module, metering module and pilot type cut-off valve module, wherein, the first passageway, piston cavity, valve stem cavity, second passageway, third passageway, fourth passageway, fifth passageway and metering cavity are equipped in the valve seat, the pressure reducing valve module is set in the middle part of valve seat, and upper end is sealed by valve cover;The pressure reducing valve module includes pressure reducing valve piston assembly, pressure reducing valve stem and diaphragm assembly, wherein, pressure reducing valve piston assembly is located in piston cavity, and pressure reducing valve stem is located in valve stem cavity, and its lower end is connected with pressure reducing valve piston assembly, and upper end is connected with diaphragm assembly;The metering cavity is multiple, and one metering module is equipped in each metering cavity, and the metering module is two groups, and symmetrically set in the two sides of pressure reducing valve module;The valve seat side between two groups of metering modules is equipped with pilot type cut-off valve module, and the valve seat close to pilot type cut-off valve module is equipped with air inlet, and the valve seat away from pilot type cut-off valve module is equipped with air outlet;Pressure reducing valve module plays a role of stable pressure to the gas entering air inlet, and the size of engine air intake is controlled by metering module, and after the gas is stabilized by pressure reducing valve module, the gas enters metering module again, can guarantee the accuracy of the measurement of metering module, to guarantee the size of accurately controlled air intake, avoid the influence on the performance of gas engine;The air intake end of pressure reducing valve module controls the air intake situation of pilot type cut-off valve module controller air intake end, and flow compensation design is introduced, to make control more accurate.

[0006] The air inlet is communicated with one end of the first passageway through the cut-off valve piston assembly of the pilot type cut-off valve module, the other end of the first passageway is communicated with the piston cavity, the piston cavity is located below the valve stem cavity, and the two are communicated with each other, the second passageway is two, and is symmetrically arranged at the two ends of the valve stem cavity along the radial direction, one end of the second passageway is communicated with the valve stem cavity, the other end extends outward along the radial direction and is communicated with the third passageway, the third passageway on each side is communicated with the upper end of the metering cavity where a group of metering modules on the same side, the fifth passageway is two, and is arranged below the two third passageways, the lower end of the same side metering cavity is communicated with the same side fifth passageway, the fourth passageway is arranged at one end of the fifth passageway, and the two fifth passageways are communicated with the fourth passageway, and the end of the fourth passageway is connected with the air outlet.

[0007] Further, the downstream of pressure reducing valve module is used to provide gas for metering module, in order to improve the accuracy of metering module, further including pressure temperature sensor, the pressure temperature sensor is arranged on the valve seat, the sixth passageway is equipped in the valve seat, and is communicated to the first diaphragm cavity through the sixth passageway, the first diaphragm cavity is located above the valve stem cavity, and the diaphragm assembly is arranged in the first diaphragm cavity. The pressure and temperature in the first diaphragm cavity downstream of pressure reducing valve module are monitored by pressure temperature sensor, and the pressure and temperature data are provided to control unit, and the opening of metering module can be controlled and adjusted according to the pressure and temperature, so as to achieve the effect of accurately controlling flow.

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

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

[0010] Further, each group comprises a plurality of metering modules, and the plurality of metering modules are arranged in a circumferential direction. According to the size of the engine power, the metering modules can be increased or decreased according to the demand, and preferably, each group of metering modules can be 3-4, facilitating the circumferential distribution.

[0011] Specifically, the shape of the valve seat as a whole is cylindrical. The cylindrical shape facilitates the circumferential distribution of the plurality of metering modules.

[0012] Further, in order to meet the demand of large flow, a compensation structure is further included, the compensation structure comprising a seventh passage arranged in the valve body, one end of the seventh passage being communicated with the fourth passage, and the other end being communicated with a second diaphragm cavity in the valve cover, the second diaphragm cavity being located above a diaphragm assembly of the pressure reducing valve module.

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

[0014] The utility model discloses a kind of gas metering valves with voltage stabilizing function, (1) the function of pressure reducing valve and metering valve is integrated, and the pressure loss between pressure reducing valve and metering valve is greatly reduced in technology, and the cost of customer is also reduced simultaneously;(2) the design of flow compensation is introduced: in high load working condition, metering module needs more gas volume, and high back pressure is also generated in the downstream of metering module, but the outlet pressure of pressure reducing valve module is constant (the constant throttling area), and more gas cannot be provided under high load, after the compensation design is introduced by seventh passage, the pressure of the downstream of metering module can be directly applied to the diaphragm of pressure reducing valve module, so that the main piston of pressure reducing valve module moves towards the opening direction, to increase the output of flow, to meet the demand of more gas volume. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model is further described below in combination with the drawings and examples.

[0016] Figure 1 It is the three-dimensional structure schematic diagram of the gas metering valve with the voltage stabilizing function of the utility model.

[0017] Figure 2 It is the overhead structure schematic diagram of the gas metering valve with the voltage stabilizing function of the utility model.

[0018] Figure 3 It is the side structure schematic diagram of the gas metering valve with the voltage stabilizing function of the utility model.

[0019] Figure 4 It is the section structure schematic diagram of A-A in the utility model. Figure 2

[0020] Figure 5 It is the section structure schematic diagram of B-B in the utility model. Figure 2

[0021] Figure 6 It is the section structure schematic diagram of C-C in the utility model. Figure 2

[0022] Figure 7 It is the gas flow schematic diagram of F-F section in the utility model. Figure 3

[0023] Figure 8 It is the gas flow schematic diagram of A-A section in the utility model. Figure 2

[0024] Figure 9 It is the gas flow schematic diagram of B-B section in the utility model. Figure 2

[0025] Figure 10 It is the gas flow schematic diagram of D-D section in the utility model. Figure 3

[0026] Figure 11 It is the gas flow schematic diagram of E-E section in the utility model. Figure 3

[0027] ​​​​​​​​In the figure: 1, valve seat, 1.1, first channel, 1.2, piston cavity, 1.3, valve rod cavity, 1.4, second channel, 1.5, third channel, 1.6, fourth channel, 1.7, first diaphragm cavity, 1.8, fifth channel, 1.9, sixth channel, 1.10, metering cavity, 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 rod, 4.4, second return spring, 4.5, diaphragm assembly, 5, metering module, 5.1, electrical interface, 5.2, upper housing, 5.3, lower housing, 5.4, flange seat, 5.5, iron core, 5.6, coil skeleton, 5.7, thimble, 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 inlet filter screen, 6, pressure temperature sensor, 7, pilot operated 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 electromagnetic valve assembly, 8, valve cover, 8.1, second diaphragm cavity. DETAILED DESCRIPTION

[0028] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the structure related to the utility model, and the direction and reference (such as up, down, left, right, etc.) can be only used to help the description of the features in the drawings. Therefore, the following detailed description is not in the restrictive sense, and the scope of the claimed subject matter is only limited by the appended claims and their equivalents.

[0029] As Figures 1-6As shown, the utility model discloses a gas metering valve with pressure stabilizing function, including valve seat 1, valve cover 8, pressure reducing valve module 4, metering module 5 and pilot type cut -off valve module 7, wherein, the overall shape of valve seat 1 is cylindrical. Cylindrical is convenient for the circumferential distribution of multiple metering module 5, be equipped with first channel 1.1, piston cavity 1.2, valve stem cavity 1.3, second channel 1.4, third channel 1.5, fourth channel 1.6, fifth channel 1.8 and metering cavity 1.10 in valve seat 1, pressure reducing valve module 4 sets up in the middle part of valve seat 1, and the upper end is sealed through valve cover 8, pressure reducing valve module 4 includes pressure reducing valve piston assembly 4.1, pressure reducing valve stem 4.3 and diaphragm assembly 4.5, wherein, pressure reducing valve piston assembly 4.1 is located in piston cavity 1.2, and pressure reducing valve stem 4.3 is located in valve stem cavity 1.3, and its lower end is connected with pressure reducing valve piston assembly 4.1, and the upper end is connected with diaphragm assembly 4.5, the metering cavity 1.10 is multiple, and one metering module 5 is equipped in each metering cavity 1.10, the metering module 5 is two groups, and is symmetrically arranged in the two sides of pressure reducing valve module 4, each group includes three metering modules 5 in the embodiment, and three metering modules 5 are arranged along the circumference, and the number of each group includes but is not limited to three. The side surface of valve seat 1 between two metering modules 5 is equipped with pilot type cut -off valve module 7, the valve seat 1 close to pilot type cut -off valve module 7 is equipped with air inlet 2, and the valve seat 1 away from pilot type cut -off valve module 7 is equipped with air outlet 3, pressure reducing valve module 4 plays a stable pressure effect to the gas entering air inlet 2, controls the size of engine air intake through metering module 5, and after the gas is stabilized by pressure reducing valve module 4, the gas enters metering module 5 again, can guarantee the accuracy of metering module 5 measurement, to guarantee the size of accurate control air intake, avoid the influence of gas engine performance, the air intake end of pressure reducing valve module 4 controls the air intake condition of pilot type cut -off valve module 7 controller air intake end, and introduces flow compensation design, makes control more accurate. The air inlet 2 is communicated with one end of first channel 1.1 through the cut -off valve piston assembly of pilot type cut -off valve module 7, the other end of first channel 1.1 is communicated with piston cavity 1.2, and piston cavity 1.2 is located below valve stem cavity 1.3, and the two are communicated, the second channel 1.4 is two, and is symmetrically arranged in the two ends of valve stem cavity 1.3 along the radial direction, one end of second channel 1.4 is communicated with valve stem cavity 1.3, and the other end extends the end and is communicated with third channel 1.5 along the radial direction, and the third channel 1.5 of each side is communicated with the upper end of the metering cavity 1.10 of one group of metering modules 5 on the same side, the third channel 1.5 of the two sides of valve body is mirror image symmetry in the cross section of valve seat 1.The fifth channel 1.8 between the two sides of the valve body is mirror-symmetric in the cross-section of the valve seat 1.

[0030] Downstream of the pressure reducing valve module 4 for providing gas to the metering module 5, in order to improve the accuracy of the metering module 5, a pressure and temperature sensor 6 is further included, which is arranged on the valve seat 1, and the valve seat 1 is provided with a sixth channel 1.9, which is connected to the first diaphragm cavity 1.7 above the valve stem cavity 1.3, and the first diaphragm cavity 1.7 is provided with a diaphragm assembly 4.5 inside. 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, which 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 the assembly of the pressure and temperature sensor 6, it is arranged on the valve seat 1 on the side of the pilot-operated shut-off valve module 7.

[0031] As shown in Figure 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 stem 4.3 (i.e. a piston shaft), a second return spring 4.4, a diaphragm assembly 4.5, a spring support seat, an adjusting screw, etc., and the structure and connection relationship thereof are disclosed in the piston assembly structure of the utility model patent with the authorized announcement number CN219974649U. The metering module 5 mainly includes an electrical interface 5.1, an upper housing 5.2, a lower housing 5.3, a flange seat 5.4, an iron core 5.5, a coil former 5.6, a top pin 5.7, a third return spring 5.8, a metal ring 5.9, a travel ring 5.10, a sealing seat 5.11, a gas outlet nozzle 5.12, an air inlet filter screen 5.13, and a plurality of sealing rings, etc., and the structure and connection relationship thereof are disclosed in the gas nozzle structure of the invention patent with the authorized announcement number CN114233528B. Therefore, the above two parts of structure will not be described here.

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

[0033] As shown in Figure 7 The pilot type cut-off valve module 7 includes cut-off valve assembly 7.1, connector 7.2 and three-way electromagnetic valve assembly 7.3. The cut-off valve piston assembly is arranged in the cut-off valve cavity between the gas inlet 2 and the first channel 1.1. The three-way electromagnetic valve assembly 7.3 is arranged in the electromagnetic valve cavity on one side of the cut-off valve assembly 7.1. The three-way electromagnetic 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 gas inlet 2 is communicated to the air inlet hole of the three-way electromagnetic valve assembly 7.3 through the first process hole arranged in the valve seat 1. The third air outlet hole is communicated to the back of the cut-off valve assembly 7.1 through the second process hole arranged in the valve seat 1. The second air outlet hole is communicated to the gas outlet 3 through the third process hole arranged in the valve seat 1. The cut-off valve assembly 7.1 and the three-way electromagnetic valve assembly 7.3 are sealed in the cut-off valve cavity and the electromagnetic valve cavity of the valve seat 1 by the side cover. The cut-off valve assembly 7.1 mainly includes sealing buffer pad, cut-off valve core and fourth return spring. The structure and connection relationship of the pilot type cut-off valve module 7 are disclosed in the utility model patent with the application number CN202421746080.0, which has a pilot type gas cut-off valve. The cut-off valve assembly and the three-way electromagnetic valve assembly in the utility model patent correspond to the structure and connection relationship of the cut-off valve assembly 7.1 and the three-way electromagnetic valve assembly 7.3 in the present utility model, so this part will not be described again.

[0034] The gas path communication system is as shown in Figure 7 The gas inlet 2 is communicated to one end of the first channel 1.1 through the cut-off valve piston assembly. The other end of the first channel 1.1 extends radially and is communicated to the side of the piston cavity 1.2 in the middle of the valve seat 1, as shown in Figure 8 and Figure 9 The upper end of the piston cavity 1.2 is communicated to the valve stem cavity 1.3. Two groups of metering modules 5 are arranged radially symmetrically on both sides of the valve seat 1 above the valve stem cavity 1.3, as shown in Figure 10As shown, the valve stem cavity 1.3 is connected to the metering module 5 via a second channel 1.4 and a third channel 1.5. One end of the second channel 1.4 is connected to the valve stem cavity 1.3, and the other end extends radially outward to connect to the third channel 1.5. Each side of the third channel 1.5 connects to a set of metering modules 5. In this embodiment, both sides of the third channel 1.5 are straight channels with an included angle α of 20°. The shape and angle of the third channel 1.5 include, but are not limited to, the straight channel and 20°, and can be set according to requirements and the arrangement of the metering modules 5. Figure 11 As shown, the lower part of the valve seat 1 is provided with a fourth channel 1.6 that communicates with the air outlet 3, and two fifth channels 1.8 that communicate with the fourth channel 1.6. The two fifth channels 1.8 are respectively located directly below the two third channels 1.5. The third channel 1.5 is used to connect the upper end of the metering chamber 1.10 with the airflow of the 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 communicate with the fourth channel 1.6 to realize the outflow of airflow. In this embodiment, the fourth channel 1.6 is located on the left side of the valve seat 1.

[0035] Working principle:

[0036] like Figures 6-11 As shown by the red arrow in the middle, the gas flows from... Figure 7 The air enters through the central intake port 2 in direction A, passes through the shut-off valve assembly 7.1, enters the first channel 1.1, and then enters the piston chamber 1.2 in direction B; (e.g., ...) Figure 8 As shown, the airflow passes through the pressure reducing valve piston assembly 4.1 and flows upward in direction C, entering the valve stem chamber 1.3; as Figure 9 As shown, the gas in the valve stem chamber 1.3 enters the second channel 1.4 along direction D; as Figure 10 As shown, the gas enters the third channel 1.5 after passing through the second channel 1.4, and then 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 sprayed out through the nozzle; as shown... Figure 11 As shown, the gas ejected from the nozzle enters the fifth channel 1.8, and the gas in the fifth channel 1.8 on both sides flows into the fourth channel 1.6 along the E direction to merge. The merged gas flows out from the outlet 3 along the F direction.

[0037] Simultaneously, the pressure and temperature sensor 6 monitors the temperature and pressure within the first diaphragm cavity 1.7 and provides this information to the control unit, which then controls the opening degree of the metering module 5 based on this signal; for example... Figure 6 As shown, when the gas volume increases, the gas in the fourth channel 1.6 generates a high back pressure, and its pressure increases. Under the action of this back pressure, the gas passes through the seventh channel 1.11 in the G direction to compensate to the second diaphragm cavity 8.1 of the pressure reducing valve module 4, thereby making the pressure reducing valve piston open more and increasing the flow output.

[0038] With the above ideal embodiment of the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the scope of the present application. The technical scope of the present application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A gas metering valve with pressure stabilizing function, characterized in that: The valve seat, the valve cover, the pressure reducing valve module, the metering module and the pilot cut-off valve module are included, wherein the first channel, the piston cavity, the valve rod cavity, the second channel, the third channel, the fourth channel, the fifth channel and the metering cavity are arranged in the valve seat, 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 includes the pressure reducing valve piston assembly, the pressure reducing valve rod and the diaphragm assembly, wherein the pressure reducing valve piston assembly is located in the piston cavity, the pressure reducing valve rod is located in the valve rod cavity, the lower end of the pressure reducing valve rod is connected with the pressure reducing valve piston assembly, and the upper end of the pressure reducing valve rod is connected with the diaphragm assembly; the metering cavity is multiple, one metering module is arranged in each metering cavity, the metering module is two groups, and the two groups are symmetrically arranged on the two sides of the pressure reducing valve module; the valve seat side between the two groups of metering modules is provided with the pilot cut-off valve module, the air inlet is arranged on the valve seat close to the pilot cut-off valve module, and the air outlet is arranged on the valve seat away from the pilot cut-off valve module; The air inlet is communicated with one end of the first channel through the cut-off valve piston assembly of the pilot cut-off valve module, the other end of the first channel is communicated with the piston cavity, the piston cavity is located below the valve rod cavity, and the piston cavity and the valve rod cavity are communicated with each other, the second channel is two, and the two are symmetrically arranged at the two ends of the valve rod cavity in the radial direction; one end of the second channel is communicated with the valve rod cavity, the other end of the second channel extends to the end of the third channel in the radial direction, the third channel on each side is communicated with the upper end of the metering cavity of the metering module on the same side, the fifth channel is two, and the two are arranged below the two third channels; the lower end of the metering cavity on the same side is communicated with 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 communicated with the fourth channel, and the end of the fourth channel is connected with the air outlet.

2. The gas metering valve with pressure stabilizing function according to claim 1, characterized in that: The pressure temperature sensor is arranged on the valve seat, the sixth channel is arranged in the valve seat, the first diaphragm cavity is communicated to the first diaphragm cavity through the sixth channel, the first diaphragm cavity is located above the valve rod cavity, and the diaphragm assembly is arranged in the first diaphragm cavity.

3. The gas metering valve with pressure stabilizing function according to claim 2, characterized in that: The third channels on the two sides of the valve seat are mirror-symmetric in the cross section of the valve seat.

4. The gas metering valve with pressure stabilizing function according to claim 2, characterized in that: The fifth channels on the two sides of the valve seat are mirror-symmetric in the cross section of the valve seat.

5. The gas metering valve with pressure stabilizing function according to claim 1, characterized in that: Each group includes multiple metering modules, and the multiple metering modules are arranged in the circumferential direction.

6. The gas metering valve with pressure stabilizing function according to claim 1, characterized in that: The shape of the whole valve seat is cylindrical.

7. The gas metering valve with pressure stabilizing function according to any one of claims 1-6, characterized in that: The compensation structure includes the seventh channel arranged in the valve body, one end of the seventh channel is communicated with the fourth channel, the other end of the seventh channel is communicated into 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 stabilizing function according to claim 1, characterized in that: The pilot cut-off valve module comprises a cut-off valve assembly, a connector and a three-way electromagnetic valve assembly, wherein the cut-off valve piston assembly is arranged in a cut-off valve cavity between an air inlet and a first channel, the three-way electromagnetic valve assembly is arranged in an electromagnetic valve cavity on one side of the cut-off valve assembly, the three-way electromagnetic valve assembly has an air inlet hole, a second air outlet hole and a third air outlet hole, high-pressure gas entering from the air inlet hole is communicated to the air inlet hole of the three-way electromagnetic valve assembly through a first process hole arranged in a valve seat, the third air outlet hole is communicated to the back of the cut-off valve assembly through a second process hole arranged in the valve seat, and the second air outlet hole is communicated to an air outlet through a third process hole arranged in the valve seat; the cut-off valve assembly and the three-way electromagnetic valve assembly are sealed in the cut-off valve cavity and the electromagnetic valve cavity of the valve seat through a side cover.

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