Light display pressure instrument based on natural gas pressure reduction pry

Abstract

The invention discloses a light display pressure instrument based on a natural gas decompression pry, and belongs to the technical field of natural gas decompression equipment. The light display pressure instrument comprises a base, and a main gas inlet pipe and a main gas outlet pipe are installed at the left end and the right end of the base respectively; a plurality of pressure reducing pipes which are distributed in a linear array are simultaneously connected between the main air inlet pipe and the main air outlet pipe, and each pressure reducing pipe is provided with a pressure regulator and a pressure gauge; the pressure instrument comprises a dial plate and a pointer installed at the circle center of the dial plate and capable of rotating along the dial plate. An annular slot is formed along the edge of the dial plate, and a light display converter which is concentric with the dial plate and does not interfere with the rotation of the pointer is mounted in the annular slot; the light display converter comprises a trigger device and a display device. According to the light display pressure instrument, whether the pressure is qualified can be visually prompted by observing light signals with different colors in the display device, the labor intensity of workers is reduced, and the problems that an existing common pressure instrument needs to read at a short distance, feedback is not timely and reading is difficult at night or in a complex environment are solved.

Description

Technical Field

[0001] This invention relates to the field of natural gas pressure relief equipment technology, specifically to a light-display pressure gauge based on a natural gas pressure relief skid. Background Technology

[0002] In natural gas pressure reducing skids, pressure gauges are needed to monitor the pressure within the pipeline after pressure reduction to determine if it falls within the acceptable range (e.g., 0.05-4.0 MPa). Existing pressure gauges are mostly ordinary mechanical pointer gauges, which generally suffer from the following problems: Readings rely on close observation: The instrument dial is small, and staff need to get close to the instrument to read the values, and then manually judge whether they are within the acceptable range, which is labor-intensive. Untimely feedback: It cannot quickly and intuitively indicate whether the pressure is abnormal, which can easily lead to the risk of pressure exceeding the standard due to negligence; Difficulty in reading at night or in complex environments: It is difficult to clearly read the dial values ​​when there is insufficient light. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a light-display pressure instrument based on a natural gas pressure relief skid. By observing the light signals of different colors, the pressure can be intuitively indicated as qualified, reducing the labor intensity of the staff and solving the problems of existing ordinary pressure instruments that require close-range reading, untimely feedback, and difficulty in reading at night or in complex environments.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A light-display pressure gauge based on a natural gas pressure relief skid includes a base, with a main inlet pipe and a main outlet pipe installed at the left and right ends of the base, respectively; multiple pressure relief pipes arranged in a linear array are connected between the main inlet pipe and the main outlet pipe, and a pressure regulator and a pressure gauge are installed on each pressure relief pipe, with the pressure gauge located near the main outlet pipe and connected to the pressure regulator. Pressure gauges include a dial and a pointer mounted at the center of the dial that can rotate around the dial; Its core improvement lies in the fact that an annular groove is provided along the edge of the dial, and a light display converter is installed in the annular groove that is concentric with the dial and does not interfere with the rotation of the pointer. The optical display converter includes a triggering device and a display device; The triggering device includes a main disc concentric with the dial, with an annular clearance groove on the inner side of the main disc; an upper trigger wire (such as a copper wire) and a lower trigger wire (such as a copper wire) concentric with the dial are fixed at the top and bottom of the annular clearance groove, respectively, wherein the upper trigger wire and the lower trigger wire are vertically aligned and there is a trigger interval between them; the tip of the pointer is fitted with a trigger guide plate (such as a copper plate) that slides along the trigger interval as the pointer rotates and can simultaneously contact the upper trigger wire and the lower trigger wire; the upper trigger wire is separated by two sets of insulating barriers (such as insulating rubber) installed in the annular clearance groove to form upper trigger wire one and upper trigger wire two, and the lower trigger wire is also separated by two sets of insulating barriers installed in the annular clearance groove to form lower trigger wire one and lower trigger wire two; The display device includes a warning light fixture that is detachably fixed to the top of the pressure gauge. The warning light fixture has two LEDs of different colors built in. The two LEDs are respectively connected to control line one and control line two, which are introduced into the annular slot. Control line one is electrically connected to both upper trigger wire one and lower trigger wire one, and control line two is electrically connected to both upper trigger wire two and lower trigger wire two. The coverage area of ​​the upper trigger wire 1 and the lower trigger wire 1 is equal to the area along the dial where the pointer rotates when the pressure value is within the acceptable range after decompression; the coverage area of ​​the upper trigger wire 2 and the lower trigger wire 2 is equal to the area along the dial where the pointer rotates when the pressure value is within the unacceptable range after decompression.

[0005] By adopting the above scheme, when the pointer rotates normally, the trigger guide sleeve on its needle tip will slide along the trigger interval as the pointer rotates: when the pointer is in the qualified range, the trigger guide will simultaneously contact the upper trigger wire one and the lower trigger wire one. At this time, after the control line one forms a closed loop, one of the lamps in the warning light will light up; when the pointer is in the unqualified range, the trigger guide will simultaneously contact the upper trigger wire two and the lower trigger wire two. At this time, after the control line two forms a closed loop, another lamp in the warning light will light up. By observing the different colored light signals, it is possible to intuitively indicate whether the pressure is qualified, reducing the labor intensity of the workers.

[0006] As a preferred embodiment of the optical pressure gauge based on a natural gas pressure relief skid, annular wire grooves are respectively opened on the outer side of the main panel. Control line one and control line two are all hidden in the annular wire grooves, further constraining the control lines and thus avoiding messy control lines.

[0007] As a preferred embodiment of the optical pressure gauge based on a natural gas pressure relief skid, the top and bottom of the annular clearance groove are respectively provided with limiting grooves (such as triangular limiting grooves). The upper trigger wire and the lower trigger wire are all fixed in the limiting groove. After the upper trigger wire and the lower trigger wire are fixed in the limiting groove, they will be more stable and reliable, which can effectively reduce the risk of the trigger wire and the lower trigger wire falling off in the annular clearance groove.

[0008] As a preferred embodiment of the optical pressure gauge based on a natural gas decompression skid, two symmetrically distributed positioning buckles are connected to the left and right sides of the insulating partition, respectively. The positioning buckles tightly abut against the top and bottom of the annular clearance groove, further strengthening the fixation of the insulating partition and preventing the insulating partition from falling off.

[0009] As a preferred embodiment of a light-display pressure gauge based on a natural gas pressure relief skid, the front end of the insulating barrier is connected to a finger located outside the annular clearance groove and close to the inner edge of the main disc. The surface of the main disc has pressure scale lines that are exactly the same as and correspond one-to-one with the pressure values ​​on the dial. The finger points exactly to the pressure scale line on the main disc. The insulating barrier is equivalent to a "boundary" between the pressure qualified range and the pressure unqualified range, thereby facilitating the confirmation of the position of the insulating barrier.

[0010] As a preferred embodiment of a light-display pressure gauge based on a natural gas decompression skid, two fingers are provided, and the two fingers are coaxially connected to an insulating partition. The two fingers located on the same axis are more easily captured by vision, which can further improve the visibility of its indication.

[0011] As a preferred embodiment of a light-display pressure instrument based on a natural gas pressure relief skid, the contact surfaces of the trigger guide plate with the upper and lower trigger wires are all arc surfaces, which can further reduce the friction between the trigger guide plate and the upper and lower trigger wires, making the trigger guide plate smoother when rotating with the pointer.

[0012] As a preferred embodiment of a light-display pressure instrument based on a natural gas pressure relief skid, the inner end of the trigger guide plate is connected to two insulating needles (such as insulating plastic), and at least two positioning needles (such as insulating plastic) are connected to the opposite surfaces of the two insulating needles. All positioning needles are inserted into the micro-holes that pass through the pointer. Two or more positioning needles can achieve the positioning of the trigger guide plate, thereby preventing it from falling off.

[0013] As a preferred embodiment of a light-display pressure gauge based on a natural gas depressurization skid, the two LEDs in the warning light illuminate green and red light respectively. The green light indicates that the pressure value is within the acceptable range after depressurization, while the red light indicates that the pressure value is within the unacceptable range after depressurization, thus providing further color differentiation.

[0014] As a preferred embodiment of the optical pressure gauge based on a natural gas pressure reducing skid, each pressure reducing pipe is also connected to a switch valve one located near the main inlet pipe and a switch valve two located near the main outlet pipe, which can individually close a pressure reducing pipe for convenient maintenance.

[0015] The beneficial effects of this invention are: 1. No need for close-range readings: The pressure is directly reflected by the color of the light (green / red), allowing workers to observe from a distance and reducing labor intensity; 2. Timely and intuitive feedback: The light signal instantly indicates the pressure status, avoiding the risk of pressure exceeding the limit due to negligence; 3. Stable and reliable structure: The arc surface design of the trigger guide and the fixed structure of the insulating barrier ensure stable and reliable signal transmission; 4. Convenient maintenance: Switch valves one and two can be shut off separately to close the pressure reducing pipe without affecting the operation of other pipelines. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 Three-dimensional structure of natural gas pressure relief skid Figure 1 ; Figure 2 Three-dimensional structure of natural gas pressure relief skid Figure 2 ; Figure 3 This is a three-dimensional structural diagram of a light-display pressure gauge; Figure 4 This is a diagram of the internal structure of a light-display pressure gauge. Figure 5 A three-dimensional structural diagram of the trigger device (with pointer) in the optical display converter; Figure 6 This is an external planar structural diagram of the triggering device in the optical display converter, where the triggering device is within the acceptable pressure range. Figure 7 This is a planar structural diagram of the triggering device in the optical display converter, showing it within the acceptable pressure range. Figure 8 This is an external planar structural diagram of the triggering device in the optical display converter when it is in the unqualified pressure range. Figure 9 This is a planar structural diagram of the triggering device in the optical display converter when it is in the unqualified pressure range. Figure 10 This is a diagram showing the internal structure of the trigger device (with a pointer) in the optical display converter; Figure 11 for Figure 10 A magnified view of a section at point A in the middle; Figure 12 for Figure 10 A magnified view of a section at point B in the middle; Figure 13 This is a diagram showing the internal structure of the pointer and trigger plate; Figure 14 for Figure 13 A magnified view of a section at point C; Figure 15 A three-dimensional structural diagram of an insulating barrier.

[0018] The markings in the diagram are: 1-Base; 2-Main air inlet pipe; 3-Main air outlet pipe; 4-Pressure reducing pipe; 5-Pressure regulator; 6-Pressure gauge; 61-Dial; 62-Pointer; 63-Annular slot; 7-Light display converter; 71-Main panel; 72-Annular clearance slot; 73-Upper trigger wire; 731-Upper trigger wire one; 732-Upper trigger wire two; 74-Lower trigger wire; 741-Lower trigger wire one; 742-Lower trigger wire two; 75-Trigger interval; 76-Insulating barrier; 77-Trigger guide plate; 78-Warning light; 79-Control wire one; 710-Control wire two; 711-Annular wire groove; 712-Limiting groove; 713-Positioning buckle; 714-Finger; 715-Insulating needle; 716-Positioning needle; 717-Microhole; 8-Switch valve one; 9-Switch valve two. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 2 As shown, a light-display pressure gauge based on a natural gas pressure relief skid is provided. It is used to display the gas pressure after pressure reduction in a natural gas pressure relief skid. Specifically, it includes a base 1, with a main inlet pipe 2 and a main outlet pipe 3 installed at the left and right ends of the base 1, respectively. Two linearly arrayed pressure relief pipes 4 are connected between the main inlet pipe 2 and the main outlet pipe 3. Each pressure relief pipe 4 is equipped with a pressure regulator 5 and a pressure gauge. The pressure gauge is located near the main outlet pipe 3 and is connected to the pressure regulator 5.

[0021] like Figures 3 to 4 As shown, the pressure gauge 6 includes a dial 61 and a pointer 62 mounted at the center of the dial 61 and capable of rotating along the dial 61; an annular groove 63 is provided along the edge of the dial 61, and a light display converter 7 is installed in the annular groove 63, which is concentrically set with the dial 61 and does not interfere with the rotation of the pointer 62; the light display converter 7 includes a triggering device and a display device.

[0022] like Figures 5 to 12As shown, the triggering device includes a main plate 71 concentric with the dial 61, and an annular clearance groove 72 is provided on the inner side of the main plate 71. An upper trigger wire 73 (copper wire) and a lower trigger wire 74 (copper wire) concentric with the dial 61 are fixed at the top and bottom of the annular clearance groove 72, respectively. The upper trigger wire 73 and the lower trigger wire 74 are vertically aligned and there is a trigger interval 75 between them. The tip of the pointer 62 is fitted with a trigger guide plate 77 (copper plate) that slides along the trigger interval 75 as the pointer 62 rotates and can simultaneously contact the upper trigger wire 73 and the lower trigger wire 74. The upper trigger wire 73 is separated by two sets of insulating barriers 76 (insulating rubber) installed in the annular clearance groove 72 to form upper trigger wire one 731 and upper trigger wire two 732. The lower trigger wire 74 is also separated by two sets of insulating barriers 76 installed in the annular clearance groove 72 to form lower trigger wire one 741 and lower trigger wire two 742.

[0023] like Figures 3 to 12 As shown, the display device includes a warning light 78 that is detachably fixed to the top of the pressure gauge 6 with screws. The warning light 78 contains two LEDs of different colors. The two LEDs illuminate green and red, respectively. Green light indicates that the pressure value after decompression is within the acceptable range, while red light indicates that the pressure value after decompression is within the unacceptable range. The green and red LEDs are respectively connected to control line 1 79 and control line 2 710, which are introduced into the annular slot 63. Control line 1 79 is electrically connected to both upper trigger wire 1 731 and lower trigger wire 1 741, and control line 2 710 is electrically connected to both upper trigger wire 2 732 and lower trigger wire 2 742. The coverage area of ​​upper trigger wire 1 731 and lower trigger wire 1 741 is equal to the area where the pointer 62 rotates along the dial 61 when the pressure value after decompression is within the acceptable range. The coverage area of ​​the second trigger lead 732 and the second lower trigger lead 742 is equal to the area of ​​the pointer 62 rotating along the dial 61 when the pressure value is in the unqualified range after depressurization. When the pointer 62 rotates normally, the trigger guide 77 sleeved at its needle tip will slide along the trigger interval 75 as the pointer 62 rotates. When the pointer 62 is in the qualified range, the trigger guide 77 will simultaneously contact the first upper trigger lead 731 and the first lower trigger lead 741. At this time, the control line 79 forms a closed loop and illuminates the green LED in the warning light 78. When the pointer 62 is in the unqualified range, the trigger guide 77 will simultaneously contact the second upper trigger lead 732 and the second lower trigger lead 742. At this time, the control line forms a closed loop and illuminates the red LED in the warning light 78. By observing the different colored light signals, the pressure can be intuitively indicated as qualified, reducing the labor intensity of the workers.

[0024] like Figure 11As shown, annular wire grooves 711 are provided on the outer side of the main disk 71. Control line 1 79 and control line 2 710 are all hidden in the annular wire grooves 711, which further constrains the control lines and avoids the control lines from becoming messy.

[0025] Continue as Figure 11 As shown, the top and bottom of the annular clearance groove 72 are respectively provided with limiting grooves 712 (triangular limiting grooves), in which the upper trigger wire 73 and the lower trigger wire 74 are all fixed in the limiting grooves 712. After the upper trigger wire 73 and the lower trigger wire 74 are fixed in the limiting grooves 712, they will be more stable and reliable, which can effectively reduce the risk of the trigger wires and the lower trigger wire 74 falling off in the annular clearance groove 72.

[0026] like Figure 15 As shown, two symmetrically distributed positioning buckles 713 are connected to the left and right sides of the insulating barrier 76, respectively. The positioning buckles 713 tightly abut against the top and bottom of the annular relief groove 72, further strengthening the fixation of the insulating barrier 76 and preventing the insulating barrier 76 from falling off.

[0027] like Figure 7 , Figure 9 , Figure 15 As shown, the front end of the insulating barrier 76 is connected to a finger 714 located outside the annular clearance groove 72 and close to the inner edge of the main plate 71. The surface of the main plate 71 is provided with pressure scale lines that are exactly the same as and correspond one-to-one with the pressure values ​​of the dial 61. The finger 714 points exactly to the pressure scale line of the main plate 71. The insulating barrier 76 is equivalent to the "boundary" between the pressure qualified area and the pressure unqualified area, thereby facilitating the confirmation of the position of the insulating barrier 76.

[0028] like Figure 15 As shown, there are two fingers 714. The two fingers 714 are coaxially connected to an insulating partition 76. The two fingers 714 located on the same axis are more easily captured by vision, which can further improve the visibility of their indication.

[0029] like Figure 10 As shown, the contact surfaces of the trigger guide 77 with the upper trigger wire 73 and the lower trigger wire 74 are all arc surfaces, which can further reduce the friction between the trigger guide 77 and the upper trigger wire 73 and the lower trigger wire 74, making the trigger guide 77 smoother when rotating with the pointer 62.

[0030] like Figures 13 to 14As shown, the inner end of the trigger guide plate 77 is connected to two insulating pins 715 (insulating plastic), and two positioning pins 716 (insulating plastic) are respectively connected to the opposite surfaces of the two insulating pins 715. All positioning pins 716 are inserted into the micro-holes 717 that pass through the pointer 62. The two positioning pins 716 can realize the positioning of the trigger guide plate 77, thereby preventing it from falling off.

[0031] like Figures 1 to 2 As shown, each pressure reducing pipe 4 is also connected to a switch valve 8 located near the main intake pipe 2 and a switch valve 9 located near the main exhaust pipe 3, which can be used to shut down a pressure reducing pipe 4 individually for easy maintenance.

[0032] The working principle of this invention is as follows: The working process of a natural gas pressure relief skid: as follows Figures 1 to 2 As shown, a pressure gauge 6 with a light display is installed at the end of the pressure reducing pipe 4 of the natural gas pressure reducing skid. High-pressure natural gas is input through the main inlet pipe 2, and then the high-pressure natural gas is evenly distributed into the two pressure reducing pipes 4. After being depressurized by the pressure regulator 5, the depressurized natural gas is output through the main outlet pipe 3. The pressure gauge 6 monitors the pressure after depressurization.

[0033] The working process of pressure gauges: such as Figures 3 to 4 As shown, an annular slot 63 is made on the edge of the dial 61 of a standard mechanical pointer 62 watch. The trigger device of the optical display converter 7 is then snapped and fixed within the annular slot 63, so that the pressure scale lines on the main dial 71 coincide with the pressure scale lines on the dial 61. The display device (warning light 78) of the optical display converter 7 is fixed to the watch head with screws, and the trigger device is electrically connected to the display device. Figures 6 to 9 As shown, based on the actual pressure of the natural gas pressure relief skid (e.g., the acceptable pressure relief range is 2-2.5 MPa), the positions of the two sets of insulating barriers 76 are adjusted according to the pressure scale lines on the main panel 71, so that the tips 714 of the two sets of insulating barriers 76 correspond to 2 MPa and 2.5 MPa respectively. When the pointer 62 rotates normally to display the pressure value, the trigger guide 77 sleeved on its needle tip will slide along the trigger interval 75 as the pointer 62 rotates: when the pointer 62 is in the acceptable range of 2-2.5 MPa, the trigger guide 77 will simultaneously contact the upper trigger wire 731 and the lower trigger wire 741. At this time, the control line 79 forms a closed circuit and illuminates the green LED in the warning light 78; when the pointer 62 is in the 0-2 MPa range... When the pressure is above 2.5MPa or in the unqualified range, the triggering plate 77 will simultaneously contact the upper triggering wire 732 and the lower triggering wire 742. At this time, after the control line forms a closed circuit, the red LED in the warning light 78 will light up. By observing the different colored light signals, the pressure can be intuitively indicated as qualified, reducing the labor intensity of the staff.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A light-display pressure gauge based on a natural gas pressure relief skid, comprising a base, wherein a main inlet pipe and a main outlet pipe are respectively installed at the left and right ends of the base; multiple pressure relief pipes arranged in a linear array are connected between the main inlet pipe and the main outlet pipe, and a pressure regulator and a pressure gauge are respectively installed on each pressure relief pipe, wherein the pressure gauge is located near the main outlet pipe and is connected to the pressure regulator. The pressure gauge includes a dial and a pointer mounted at the center of the dial and capable of rotating along the dial. Its features are: An annular slot is provided along the edge of the dial, and a light display converter that is concentric with the dial and does not interfere with the rotation of the pointer is installed in the annular slot. The optical display converter includes a triggering device and a display device; The triggering device includes a main disc concentric with the dial, and an annular clearance groove is formed on the inner side of the main disc. An upper trigger wire and a lower trigger wire concentric with the dial are fixed at the top and bottom of the annular clearance groove, respectively. The upper trigger wire and the lower trigger wire are vertically aligned and there is a trigger interval between them. The tip of the pointer is fitted with a trigger guide plate that slides along the trigger interval as the pointer rotates and can simultaneously contact the upper trigger wire and the lower trigger wire. The upper trigger wire is separated by two sets of insulating barriers installed in the annular clearance groove to form upper trigger wire one and upper trigger wire two. The lower trigger wire is also separated by two sets of insulating barriers installed in the annular clearance groove to form lower trigger wire one and lower trigger wire two. The display device includes a warning light fixture that is detachably fixed to the top of the pressure gauge. The warning light fixture has two LEDs of different colors built in. The two LEDs are respectively connected to control line one and control line two, which are introduced into the annular slot. Control line one is electrically connected to both upper trigger wire one and lower trigger wire one, and control line two is electrically connected to both upper trigger wire two and lower trigger wire two. The coverage area of ​​the upper trigger wire one and the lower trigger wire one is equal to the area of ​​the pointer rotating along the dial when the pressure value is within the qualified range after decompression; the coverage area of ​​the upper trigger wire two and the lower trigger wire two is equal to the area of ​​the pointer rotating along the dial when the pressure value is within the unqualified range after decompression.

2. The optical pressure gauge based on a natural gas pressure relief skid according to claim 1, characterized in that: The outer side of the main disk is provided with annular wire grooves, and control line one and control line two are all hidden in the annular wire grooves.

3. The optical pressure gauge based on a natural gas pressure relief skid according to claim 1, characterized in that: Limiting grooves are respectively provided at the top and bottom of the annular clearance groove, wherein the upper trigger wire and the lower trigger wire are all fixed in the limiting groove.

4. The optical pressure gauge based on a natural gas pressure relief skid according to claim 1, characterized in that: The insulating barrier is connected to two symmetrically distributed positioning buckles on its left and right sides, with the positioning buckles tightly abutting against the top and bottom of the annular clearance groove.

5. The optical pressure gauge based on a natural gas pressure relief skid according to claim 1, characterized in that: The front end of the insulating barrier is connected to a finger located outside the annular clearance groove and close to the edge of the inner wall of the main plate. The surface of the main plate is provided with pressure scale lines that are exactly the same as and correspond one-to-one with the pressure values ​​on the dial, and the finger points exactly to the pressure scale line of the main plate.

6. The optical pressure gauge based on a natural gas pressure relief skid according to claim 5, characterized in that: There are two fingers in total, and the two fingers are coaxially connected to an insulating barrier.

7. The optical pressure gauge based on a natural gas pressure relief skid according to claim 1, characterized in that: The contact surfaces between the trigger guide plate and the upper and lower trigger wires are all arc surfaces.

8. The optical pressure gauge based on a natural gas pressure relief skid according to claim 1, characterized in that: The inner end of the trigger guide is connected to two insulating needles, and at least two positioning needles are connected to the opposite surfaces of the two insulating needles respectively. All positioning needles are inserted into the micro-holes that pass through the pointer.

9. The optical pressure gauge based on a natural gas pressure relief skid according to claim 1, characterized in that: The two LEDs in the warning light illuminate green and red, respectively. Green light indicates that the pressure value is within the acceptable range after decompression, while red light indicates that the pressure value is within the unacceptable range after decompression.

10. The optical pressure gauge based on a natural gas pressure relief skid according to claim 1, characterized in that: Each pressure reducing pipe is also connected to a switch valve one located near the main intake pipe and a switch valve two located near the main exhaust pipe.

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