Monitoring and pressure regulating device for fluid in natural gas pipeline

Abstract

The invention relates to a monitoring and pressure regulating device for fluid in a natural gas pipeline. Comprising a gas inlet pipe, a monitoring assembly, an adapter pipe, a pressure regulating assembly and a gas outlet pipe which are sequentially connected, the monitoring assembly comprises a monitoring director and a monitoring valve, and the pressure regulating assembly comprises a pressure regulating director and a pressure regulating valve; the air inlet pipe, the first adjusting plate, the adapter pipe, the second adjusting plate and the air outlet pipe are sequentially communicated to form a through flow guide cavity; and the monitoring director and the pressure regulating director are consistent in structure and are divided into an upper end part and a lower end part through a dynamic diaphragm. The monitoring valve is additionally arranged in front of the pressure regulating valve, the set pressure of the monitoring valve is slightly higher than the set pressure of the pressure regulating valve, and the set pressure of the monitoring valve is higher than the pressure of the air outlet pipe, so that the monitoring valve is in a full-open state, and the monitoring valve can keep working after the downstream pressure is increased due to the fault of the pressure regulating valve.

Description

Technical Field

[0001] The invention belongs to the technical field of natural gas pipeline monitoring, and in particular relates to a fluid monitoring and pressure regulating device in a natural gas pipeline. Background Art

[0002] As an important clean energy, natural gas plays an increasingly important role in modern society. As its main mode of transportation, natural gas pipelines have the advantages of low leakage, low pollution, and high efficiency. However, during pipeline transportation, the control of fluid parameters such as pressure and flow is crucial to ensure transportation safety and efficiency.

[0003] Natural gas is flammable and explosive. If the fluid pressure in the pipeline is too high or too low, it may cause a safety accident. Therefore, it is necessary to monitor the fluid in the pipeline in real time and adjust the pressure as needed to ensure transportation safety. In natural gas pipeline transportation, the pressure of the fluid directly affects its transportation efficiency. Through monitoring and pressure regulation, it can ensure that the fluid runs at the optimal pressure in the pipeline, thereby improving transportation efficiency.

[0004] The pressure regulating valve is a commonly used pressure regulating device in natural gas pipelines. Its basic principle is to use the regulating function of the valve to control the flow and pressure of the gas by adjusting the opening of the valve. However, in actual applications, when a simple pressure regulating valve fails, the downstream will stop supplying gas due to the interruption of the fault, which will cause energy supply interruption during the emergency repair period and cause economic and property losses. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a fluid monitoring and pressure regulating device in a natural gas pipeline. By adding a monitoring valve in front of the pressure regulating valve, the set pressure of the monitoring valve is slightly higher than the set pressure of the pressure regulating valve. Since the set pressure of the monitoring valve is higher than the outlet pipe pressure, the monitoring valve is in a fully open state, ensuring that the pressure regulating valve can maintain operation through the monitoring valve after the downstream pressure increases due to a failure of the pressure regulating valve.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A fluid monitoring and pressure regulating device in a natural gas pipeline comprises an inlet pipe, a monitoring component, a transfer pipe, a pressure regulating component and an outlet pipe connected in sequence, the monitoring component comprises a monitoring commander and a monitoring valve, a first regulating plate is arranged in the monitoring valve, and a first left cavity and a first right cavity are arranged at the left and right ends of the first regulating plate; the pressure regulating component comprises a pressure regulating commander and a pressure regulating valve, a second regulating plate is arranged in the pressure regulating valve, and a second left cavity and a second right cavity are arranged at the left and right ends of the second regulating plate; the inlet pipe, the first regulating plate, the transfer pipe, the second regulating plate and the outlet pipe are connected in sequence to form a through guide pipe. flow cavity; the structures of the monitoring controller and the pressure regulating controller are consistent and are separated into an upper end and a lower end by a dynamic diaphragm; the first pipe provided on the outlet pipe is connected to the lower ends of the monitoring controller and the pressure regulating controller respectively, the second pipe on the outlet pipe is connected to the upper end and the second left cavity of the pressure regulating controller respectively, and the third pipe on the outlet pipe is connected to the upper end and the first left cavity of the monitoring controller respectively; the fourth pipe on the inlet pipe passes through the upper end of the monitoring controller in sequence and is connected to the first right cavity, and the fifth pipe on the transfer pipe passes through the upper end of the pressure regulating controller in sequence and is connected to the second right cavity.

[0008] The monitoring commander and the pressure regulating commander both include a voltage stabilizing part, a detection part and a pressure regulating part. The voltage stabilizing part and the pressure regulating part are both arranged in the upper end and respectively abut the detection part of the lower end through the dynamic diaphragm; the voltage stabilizing part is provided with a push plate connected to the dynamic diaphragm, the push plate of the monitoring commander is connected to the fourth pipeline, and the push plate of the pressure regulating commander is connected to the fifth pipeline; the detection part is provided with a first spring, and the first spring abuts the lower end of the push plate and the dynamic diaphragm. The detection parts of the monitoring commander and the pressure regulating commander are connected to each other and connected to the first pipeline; the pressure regulating part includes an adjusting stud, an adjusting diaphragm, an adjusting pressure rod and an adjusting cavity. The adjusting stud passes through the pressure regulating part from top to bottom and abuts on the adjusting diaphragm. The lower end of the adjusting diaphragm abuts on the adjusting The lower end of the pressure rod penetrates into the regulating chamber, one end of the regulating chamber is connected to the push plate in the voltage stabilizing part, the other end of the regulating chamber of the monitoring commander is connected to the first right chamber, and the other end of the regulating chamber of the pressure regulating commander is connected to the second right chamber; the pressure regulating part also includes a top pressure plate and a second spring, the upper end of the second spring is connected to the top pressure plate, the lower end of the second spring is connected to the regulating diaphragm, and the lower end of the regulating stud abuts against the top pressure plate; the pressure regulating part also includes a balancing chamber and a balancing stud, the balancing chamber is connected to the regulating chamber, the balancing stud penetrates from the outside of the regulating part and is between the connection between the balancing chamber and the regulating chamber and separates the balancing chamber from the regulating chamber, the balancing chamber of the monitoring commander is respectively connected to the first left chamber and the third pipeline, and the balancing chamber of the pressure regulating commander is respectively connected to the second left chamber and the second pipeline.

[0009] In the natural gas pipeline fluid monitoring and pressure regulating device of this structure, the natural gas entering the intake pipe has its fourth pipeline connected to the push plate of the monitoring controller, and the natural gas pressure in the intake pipe will push the push plate, so that the hydraulic pressure in the intake pipe connected to the first right chamber maintains the pressure, and the first left chamber is connected to the outlet pipe through the third pipeline, and the first pipeline of the intake pipe is connected to the detection part of the monitoring controller, and the detection part presses against the dynamic diaphragm, and the dynamic diaphragm presses against the push plate under the auxiliary force of the first spring, so that a dynamic balance is formed with the push plate on the detection part and the pressure stabilizing part. Therefore, when the pressure in the outlet pipe changes, it will act on the first left chamber, so as to adjust the first regulating plate to adjust the monitoring valve. Outlet; After the natural gas enters the transfer tube through the monitoring valve, it enters the pressure regulating valve. The fifth pipeline on the transfer tube is connected to the push plate of the pressure regulating commander. The natural gas pressure in the transfer tube will push the push plate, so that the hydraulic pressure connected to the second right chamber inside it maintains pressure, and the second left chamber is connected to the air outlet pipe through the second pipeline, and the first pipeline of the air inlet pipe is connected to the detection part of the pressure regulating commander. The detection part presses against the dynamic diaphragm, and the dynamic diaphragm presses against the push plate under the auxiliary force of the first spring, so that a dynamic balance is formed with the push plate on the detection part and the pressure stabilizing part. Therefore, when the pressure in the air outlet pipe changes, it will act on the second left chamber, thereby adjusting the second regulating plate to adjust the outlet of the pressure regulating valve. In order to ensure that the pressure regulating valve plays a pressure regulating role first during daily work, the monitoring valve plays a secondary monitoring role. When the pressure regulating valve fails and loses its regulating ability, the monitoring valve intervenes to ensure a continuous supply of natural gas. Therefore, the adjusting stud in the monitoring commander is turned to change the pressure of the top pressure plate on the regulating diaphragm through the second spring, so that its pressure is slightly higher than the pressure of the pressure regulating commander. Therefore, the dynamic change of pressure in the outlet pipe will first act on the pressure regulating valve for regulation, and the monitoring commander with higher pressure itself keeps the air pressure of the inlet pipe and the transfer pipe unobstructed. When the pressure regulating valve fails and loses its regulating ability, the monitoring valve intervenes to ensure the normal pressure regulating function of the natural gas pipeline and ensure that the natural gas supply will not be interrupted.

[0010] Furthermore, a third spring is provided in the first left cavity, and the first regulating plate opens and closes the monitoring valve by the action of the third spring; a fourth spring is provided in the second left cavity, and the second regulating plate opens and closes the pressure regulating valve by the action of the fourth spring.

[0011] Compared with the prior art, the advantages of the present invention are: by twisting the adjusting stud in the monitoring controller, the pressure of the top pressure plate on the adjusting diaphragm through the second spring is changed, so that its pressure is slightly higher than the pressure of the pressure regulating controller. Therefore, the dynamic change of pressure in the outlet pipe will preferentially act on the pressure regulating valve for regulation, and the monitoring controller with a higher pressure itself will keep the air pressure of the inlet pipe and the transfer pipe unobstructed. When the pressure regulating valve fails and loses its regulating ability, the monitoring valve will intervene to ensure the normal pressure regulating function of the natural gas pipeline and ensure that the natural gas supply will not be cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 is a schematic diagram of the present invention;

[0014] Figure 2 For the present invention Figure 1 A local enlarged view of point A;

[0015] Figure 3 For the present invention Figure 1 A partial enlarged view of point B;

[0016] Figure 4 For the present invention Figure 1 A partial enlarged view of point C.

[0017] Among them: 1. intake pipe; 11. fourth pipeline; 2. monitoring component; 21. monitoring controller; 22. monitoring valve; 221. first regulating plate; 222. first left chamber; 2221. third spring; 223. first right chamber; 23. dynamic diaphragm; 231. upper end; 232. lower end; 233. voltage stabilizing part; 2331. push plate; 234. detection part; 2341. first spring; 235. voltage regulating part; 2351. regulating stud; 2 352, regulating diaphragm; 2353, regulating pressure rod; 2354, regulating chamber; 2355, top pressure plate; 2356, second spring; 2357, balancing chamber; 2358, balancing stud; 4, pressure regulating assembly; 41, pressure regulating controller; 42, pressure regulating valve; 421, second regulating plate; 422, second left chamber; 4221, fourth spring; 423, second right chamber; 5, outlet pipe; 51, first pipeline; 52, second pipeline; 53, third pipeline. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0019] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings:

[0020] like Figure 1-4 As shown, a fluid monitoring and pressure regulating device in a natural gas pipeline comprises an intake pipe 1, a monitoring component 2, a transfer pipe, a pressure regulating component 4 and an outlet pipe 5 connected in sequence, the monitoring component 2 comprises a monitoring commander 21 and a monitoring valve 22, a first regulating plate 221 is arranged in the monitoring valve 22, and a first left cavity 222 and a first right cavity 223 are arranged at the left and right ends of the first regulating plate 221; the pressure regulating component 4 comprises a pressure regulating commander 41 and a pressure regulating valve 42, a second regulating plate 421 is arranged in the pressure regulating valve 42, and a second left cavity 422 and a second right cavity 423 are arranged at the left and right ends of the second regulating plate 421; the intake pipe 1, the first regulating plate 221, the transfer pipe, the second regulating plate 421 and the outlet pipe 5 are connected in sequence to form a through flow guiding cavity; The monitoring controller 21 and the pressure regulating controller 41 have the same structure and are separated into an upper end 231 and a lower end 232 by a dynamic diaphragm 23; the first pipe 51 provided on the air outlet pipe 5 is connected to the monitoring controller 21 and the lower end 232 in the pressure regulating controller 41 respectively, the second pipe 52 on the air outlet pipe 5 is connected to the upper end 231 and the second left cavity 422 of the pressure regulating controller 41 respectively, and the third pipe 53 on the air outlet pipe 5 is connected to the upper end 231 and the first left cavity 222 of the monitoring controller 21 respectively; the fourth pipe 11 on the air inlet pipe 1 sequentially penetrates the upper end 231 of the monitoring controller 21 and is connected to the first right cavity 223, and the fifth pipe on the transfer pipe sequentially penetrates the upper end 231 of the pressure regulating controller 41 and is connected to the second right cavity 423.

[0021] The monitoring commander 21 and the pressure regulating commander 41 both include a voltage stabilizing portion 233, a detection portion 234 and a voltage regulating portion 235. The voltage stabilizing portion 233 and the voltage regulating portion 235 are both arranged in the upper end portion 231 and are respectively in contact with the detection portion 234 of the lower end portion 232 through the dynamic diaphragm 23; a push plate 2331 connected to the dynamic diaphragm 23 is arranged in the voltage stabilizing portion 233; the push plate 2331 of the monitoring commander 21 is connected to the fourth pipeline 11, and the push plate 2331 of the pressure regulating commander 41 is connected to the fifth pipeline; the detection portion 234 is provided with a first The first spring 2341 is abutted against the lower end of the connection between the push plate 2331 and the dynamic diaphragm 23. The detection part 234 of the monitoring commander 21 and the pressure regulating commander 41 are connected to each other and connected to the first pipeline 51. The pressure regulating part 235 includes an adjusting stud 2351, an adjusting diaphragm 2352, an adjusting pressure rod 2353 and an adjusting cavity 2354. The adjusting stud 2351 passes through the pressure regulating part 235 from top to bottom and abuts against the adjusting diaphragm 2352. The lower end of the adjusting pressure rod 2353 abuts against the lower end of the adjusting diaphragm 2352. The regulating chamber 2354 is connected to the push plate 2331 in the voltage stabilizing part 233, and the other end of the regulating chamber 2354 of the monitoring commander 21 is connected to the first right chamber 223, and the other end of the regulating chamber 2354 of the voltage regulating commander 41 is connected to the second right chamber 423; the voltage regulating part 235 also includes a top pressure plate 2355 and a second spring 2356, the upper end of the second spring 2356 is connected to the top pressure plate 2355, the lower end of the second spring 2356 is connected to the regulating diaphragm 2352, and the lower end of the regulating stud 2351 is connected to the regulating diaphragm 2352. Abutting on the top pressure plate 2355; the pressure regulating part 235 also includes a balancing chamber 2357 and a balancing stud 2358, the balancing chamber 2357 is communicated with the regulating chamber 2354, the balancing stud 2358 penetrates from the outside of the regulating part and is between the connection between the balancing chamber 2357 and the regulating chamber 2354 and separates the balancing chamber 2357 from the regulating chamber 2354, the balancing chamber 2357 of the monitoring commander 21 is respectively connected to the first left chamber 222 and the third pipeline 53, and the balancing chamber 2357 of the pressure regulating commander 41 is respectively connected to the second left chamber 422 and the second pipeline 52.

[0022] Furthermore, a third spring 2221 is provided in the first left chamber 222 , and the first regulating plate 221 opens and closes the monitoring valve 22 through the force of the third spring 2221 ; a fourth spring 4221 is provided in the second left chamber 422 , and the second regulating plate 421 opens and closes the pressure regulating valve 42 through the force of the fourth spring 4221 .

[0023] Description of the working method of the present invention:

[0024] In the natural gas pipeline fluid monitoring and pressure regulating device of this structure, the natural gas entering the intake pipe 1 is connected to the push plate 2331 of the monitoring commander 21 through the fourth pipeline 11. The natural gas pressure in the intake pipe 1 pushes the push plate 2331, so that the hydraulic pressure in the intake pipe 1 connected to the first right chamber 223 maintains pressure, and the first left chamber 222 is connected to the outlet pipe 5 through the third pipeline 53. The first pipeline 51 of the intake pipe 1 is connected to the detection part 234 of the monitoring commander 21, and the detection part 234 is pressed against the dynamic diaphragm 23. The dynamic diaphragm 23 is in the first spring 2341. The auxiliary force presses against the push plate 2331, so that a dynamic balance is formed between the detection part 234 and the voltage stabilizing part 233 and the push plate 2331. Therefore, when the pressure in the outlet pipe 5 changes, it will act on the first left chamber 222, so as to adjust the first regulating plate 221 to adjust the outlet of the monitoring valve 22. The first regulating plate 221 maintains the contact force under the action of the basic elastic force of the third spring 2221. Once the monitoring commander 21 loses its adjustment ability, the third spring 2221 can seal the monitoring valve 22 with the first regulating plate 221 to directly After the natural gas enters the transfer pipe through the monitoring valve 22, it enters the pressure regulating valve 42. The fifth pipeline on the transfer pipe is connected to the push plate 2331 of the pressure regulating commander 41. The natural gas pressure in the transfer pipe pushes the push plate 2331, so that the hydraulic pressure in the second right chamber 423 is maintained, and the second left chamber 422 is connected to the outlet pipe 5 through the second pipeline 52. The first pipeline 51 of the intake pipe 1 is connected to the detection part 234 of the pressure regulating commander 41. The detection part 234 is pressed against the dynamic diaphragm 23. The dynamic diaphragm 23 is assisted by the first spring 2341. The push plate 2331 is pushed down with force to form a dynamic balance with the push plate 2331 on the detection part 234 and the voltage stabilizing part 233. Therefore, when the pressure in the outlet pipe 5 changes, it will act on the second left chamber 422, thereby adjusting the second adjusting plate 421 to adjust the outlet of the pressure regulating valve 42. The second adjusting plate 421 maintains the abutment force under the action of the basic elastic force of the fourth spring 4221. Once the pressure regulating commander 41 loses its adjustment ability, the fourth spring 4221 can seal the second adjusting plate 421 to directly close the pressure regulating valve 42 when it is out of control.In order to ensure that the pressure regulating valve 42 plays a pressure regulating role first during daily work, the monitoring valve 22 plays a secondary monitoring role. When the pressure regulating valve 42 fails and loses its regulating ability, the monitoring valve 22 intervenes to ensure a continuous supply of natural gas. Therefore, the adjusting stud 2351 in the monitoring commander 21 is turned to change the pressure of the top pressure plate 2355 on the regulating diaphragm 2352 through the second spring 2356, so that its pressure is slightly higher than the pressure of the pressure regulating commander 41. Therefore, the dynamic change of pressure in the outlet pipe 5 will preferentially act on the pressure regulating valve 42 for regulation, and the monitoring commander 21 with a higher pressure itself keeps the air pressure of the inlet pipe 1 and the transfer pipe unobstructed. When the pressure regulating valve 42 fails and loses its regulating ability, the monitoring valve 22 intervenes to ensure the normal pressure regulating function of the natural gas pipeline and ensure that the natural gas supply will not be interrupted.

[0025] The beneficial effect of the present invention is that by twisting the adjusting screw 2351 in the monitoring commander 21, the pressure of the top pressure plate 2355 on the adjusting diaphragm 2352 is changed through the second spring 2356, so that its pressure is slightly higher than the pressure of the pressure regulating commander 41. Therefore, the dynamic change of pressure in the outlet pipe 5 will preferentially act on the pressure regulating valve 42 for regulation, and the monitoring commander 21 with a higher pressure itself keeps the air pressure of the inlet pipe 1 and the transfer pipe unobstructed. When the pressure regulating valve 42 fails and loses its regulating ability, the monitoring valve 22 intervenes to ensure the normal pressure regulation of the natural gas pipeline and ensure that the natural gas supply will not be interrupted.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fluid monitoring and pressure regulating device in a natural gas pipeline, characterized in that: The invention comprises an air inlet pipe, a monitoring component, a transfer pipe, a pressure regulating component and an air outlet pipe connected in sequence, wherein the monitoring component comprises a monitoring commander and a monitoring valve, wherein a first regulating plate is arranged in the monitoring valve, and a first left cavity and a first right cavity are arranged at the left and right ends of the first regulating plate; the pressure regulating component comprises a pressure regulating commander and a pressure regulating valve, wherein a second regulating plate is arranged in the pressure regulating valve, and a second left cavity and a second right cavity are arranged at the left and right ends of the second regulating plate; the air inlet pipe, the first regulating plate, the transfer pipe, the second regulating plate and the air outlet pipe are connected in sequence to form a through flow guiding cavity; the monitoring commander The structures of the controller and the pressure regulating controller are consistent and are separated into an upper end and a lower end by a dynamic diaphragm; the first pipe provided on the outlet pipe is connected to the lower ends of the monitoring controller and the pressure regulating controller respectively, the second pipe on the outlet pipe is connected to the upper end and the second left cavity of the pressure regulating controller respectively, and the third pipe on the outlet pipe is connected to the upper end and the first left cavity of the monitoring controller respectively; the fourth pipe on the inlet pipe passes through the upper end of the monitoring controller in sequence and is connected to the first right cavity, and the fifth pipe on the transfer pipe passes through the upper end of the pressure regulating controller in sequence and is connected to the second right cavity.

2. The device for monitoring and regulating fluid pressure in a natural gas pipeline according to claim 1, characterized in that: The monitoring controller and the voltage regulating controller both include a voltage stabilizing part, a detection part and a voltage regulating part. The voltage stabilizing part and the voltage regulating part are both arranged in the upper end and abut against the detection part of the lower end through a dynamic diaphragm.

3. The device for monitoring and regulating fluid pressure in a natural gas pipeline according to claim 2, characterized in that: A push plate connected to the dynamic diaphragm is provided in the pressure stabilizing part, the push plate of the monitoring commander is connected to the fourth pipeline, and the push plate of the pressure regulating commander is connected to the fifth pipeline.

4. The device for monitoring and regulating fluid pressure in a natural gas pipeline according to claim 3, characterized in that: A first spring is arranged in the detection part, and the first spring abuts against the lower end of the connection between the push plate and the dynamic diaphragm. The detection parts of the monitoring commander and the pressure regulating commander are interconnected and connected to the first pipeline.

5. The device for monitoring and regulating fluid pressure in a natural gas pipeline according to claim 4, characterized in that: The voltage regulating part includes an adjusting stud, an adjusting diaphragm, an adjusting pressure rod and an adjusting chamber. The adjusting stud passes through the voltage regulating part from top to bottom and abuts on the adjusting diaphragm. The lower end of the adjusting pressure rod abutted by the lower end of the adjusting diaphragm penetrates into the adjusting chamber. One end of the adjusting chamber is connected to the push plate in the voltage stabilizing part. The other end of the adjusting chamber of the monitoring commander is connected to the first right chamber, and the other end of the adjusting chamber of the pressure regulating commander is connected to the second right chamber.

6. The device for monitoring and regulating fluid pressure in a natural gas pipeline according to claim 5, characterized in that: The pressure regulating part further includes a top pressure plate and a second spring, the upper end of the second spring is connected to the top pressure plate, the lower end of the second spring is connected to the regulating diaphragm, and the lower end of the regulating stud abuts against the top pressure plate.

7. The device for monitoring and regulating fluid pressure in a natural gas pipeline according to claim 6, characterized in that: The pressure regulating part also includes a balancing chamber and a balancing stud, the balancing chamber is connected to the regulating chamber, the balancing stud penetrates from the outside of the regulating part and is located between the connecting part of the balancing chamber and the regulating chamber and separates the balancing chamber from the regulating chamber, the balancing chamber of the monitoring controller is respectively connected to the first left chamber and the third pipeline, and the balancing chamber of the pressure regulating controller is respectively connected to the second left chamber and the second pipeline.

8. The device for monitoring and regulating fluid pressure in a natural gas pipeline according to claim 1, characterized in that: A third spring is disposed in the first left cavity, and the first regulating plate opens and closes the monitoring valve through the action force of the third spring.

9. The device for monitoring and regulating fluid pressure in a natural gas pipeline according to claim 8, characterized in that: A fourth spring is disposed in the second left chamber, and the second regulating plate opens and closes the pressure regulating valve through the action of the fourth spring.

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