A double-ball valve for natural gas emergency cut-off

Abstract

The present invention relates to the technical field of valves, and discloses a double-ball valve for natural gas emergency cut-off, which includes a valve body and an actuator assembly provided on the valve body. By rotating the actuator assembly, the channels connected to both ends of the valve body are closed. The valve body includes a first valve body and a second valve body, and the ends of the first valve body and the second valve body are connected by a connection assembly. The connection assembly is used to connect the channels in the valve bodies on both sides, and the connection assembly is a detachable structure. The first valve body and the second valve body are quickly disassembled through the connection assembly. In the present invention, the connection at the joint of the double-ball valve is realized through a mortise and tenon structure, and the rod for detecting air pressure is used as the tenon rod, which can effectively avoid the disadvantages of the double-ball valve connected by structures such as spiral ports or radial buckles, improve the torsional and tensile strength at the joint of the valve, and ensure the connection stability of the double-ball valve on the premise of realizing quick disassembly.

Description

Technical Field

[0001] The present invention relates to the field of valves, and more specifically, it relates to a double-ball valve for emergency cut-off of natural gas. Background Art

[0002] The double-ball valve is applied to scenarios where harmful gases are transported. The double-ball valve combines two ball valves for use. When a pipeline connected to one ball valve has problems and needs to be removed or repaired, the other ball valve is closed, and the faulty ball valve and pipeline are removed and repaired, eliminating the work of plugging and being convenient to use. Between the two ball valves, in order to enable quick assembly, the two ball valves are often clamped together, for example, there is an interlaced rotary interface structure at the clamping port, or there are buckle structures along the pipeline direction on both sides of the opposite docking ports of the two to make the two ball valves stably connected. However, when the pipeline is distorted and radially stretched, the interlaced rotary interface structure and the buckle structure along the pipeline direction will fail, causing leakage at the connection position of the ball valves and affecting the transportation of harmful gases inside the double-ball valve. Summary of the Invention

[0003] The present invention provides a double-ball valve for emergency cut-off of natural gas, which solves the technical problem that in the related art, when the pipeline is distorted and radially stretched, the interlaced rotary interface structure and the buckle structure along the pipeline direction in the double-ball valve fail.

[0004] The present invention provides a double-ball valve for emergency cut-off of natural gas, including a valve body and an actuator assembly provided on the valve body. By rotating the actuator assembly, the channels connected to both ends of the valve body are closed. The valve body includes a first valve body and a second valve body. The ends of the first valve body and the second valve body are connected by a connection assembly. The connection assembly is used to connect the channels inside the two valve bodies on both sides, and the connection assembly is a detachable structure. The first valve body and the second valve body are quickly disassembled through the connection assembly;

[0005] The connection assembly includes a first plug-in part and a second plug-in part. The orthographic projection structure of the ports of the first plug-in part and the second plug-in part is stepped, and the ports of the first plug-in part and the second plug-in part are inserted and matched with each other. Edge port screw holes are provided in the middle of the inner sides of the ports of the first plug-in part and the second plug-in part, and a detection part is connected by threads in the edge port screw holes. The height direction of the detection part is perpendicular to the length direction of the connection assembly;

[0006] When the actuator assembly of the first valve body / second valve body closes the channel inside the valve body, the connection relationship between the detection part and the connection assembly is released, and the second valve body / first valve body moves along the length direction of the connection assembly and is removed from the double-ball valve.

[0007] Further, the ports of the first plug-in part and the second plug-in part are divided into low-side ports and high-side ports. A slot is provided at the lower position on the connection side of the low-side port and the high-side port, and a plug post is provided at the higher position on the connection side of the low-side port and the high-side port. The specifications of the plug post are adapted to the groove type of the slot.

[0008] Further, rubber rings are provided on the low-side port, the high-side port and their connection sides.

[0009] Further, the detection part includes a barometer, a through rod and a fixed head. The fixed head is provided at the bottom end of the through rod, the fixed head seals the rod end of the through rod, the other end of the through rod is connected to the barometer, and several through holes are provided on the outer side wall of the through rod.

[0010] Further, threads are provided on the outer side of the connection between the fixed head and the through rod, and threads are also provided on the outer side of the connection between the through rod and the barometer. The threads are adapted to the threads in the side port screw holes.

[0011] Further, both the first valve body and the second valve body include a valve housing and a flange. The flange is provided on the side of the valve housing away from the connection assembly.

[0012] Further, the execution assembly includes a valve seat and a rotating part. The valve seat is provided on the top of the valve housing, and the rotating part is arranged perpendicular to the valve seat. The bottom end of the rotating part extends into the channel inside the valve housing.

[0013] Further, the rotating part includes a handle, a valve rod and a valve ball. The valve rod is connected between the handle and the valve ball. An expansion part is provided inside the valve housing. The valve ball is driven by the handle and the valve rod to rotate 0-90° inside the expansion part.

[0014] Further, a connection port is provided on one side of the valve housing. A valve body detection nozzle is provided inside the connection port. The connection port is communicated with the connection parts of the valve housing and the valve rod. The valve body detection nozzle is used to detect the connection tightness between the valve rod and the valve housing.

[0015] Further, the first valve body and the second valve body are made of brass or stainless steel, and the connection assembly, the through rod and the fixed head are all made of brass.

[0016] The present invention also proposes a method for judging the removal position of a double-ball valve for natural gas emergency cut-off. This method is used to judge the removal position of the first valve body / second valve body of the double-ball valve for natural gas emergency cut-off and the pipeline connected thereto, and includes the following steps:

[0017] S1: A set of double-ball valves need to be installed at both the output end and the input end of the natural gas pipeline, and several sets of double-ball valves can also be set on the conveying path of the natural gas pipeline. The number of double-ball valves on the natural gas pipeline is at least two groups;

[0018] S2: The double-ball valve at the output end is A, the double-ball valve at the input end is C, the double-ball valve on the natural gas pipeline conveying path is B, and the pipeline between the double-ball valve at the output end and the double-ball valve at the input end is AC;

[0019] S3: When the natural gas is in an emergency cut-off state, it is judged by the air pressure gauge value on the double-ball valve. The part of the pipeline in emergency cut-off is located on AC or AB / BC;

[0020] S4: Close the first valve body / second valve body in A, remove the second valve body / first valve body in A, and close the second valve body / first valve body in C, remove the first valve body / second valve body in C, and remove AC connected between the two valve bodies on both sides together.

[0021] The beneficial effect of the present invention is that the connection part of this double-ball valve is connected through a mortise and tenon structure, and the connecting rod for detecting air pressure is used as the tenon rod, which can effectively avoid the disadvantages of the existing technology when the double-ball valve is connected through structures such as spiral ports or radial buckles, improve the torsional and tensile strength of the valve connection part, and ensure the connection stability of the double-ball valve on the premise of realizing quick disassembly. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of a double-ball valve for natural gas emergency cut-off proposed by the present invention;

[0023] Figure 2 is of the present invention Figure 1 schematic structural diagram of the connection component;

[0024] Figure 3 is of the present invention Figure 2 assembly effect schematic diagram of the connection component;

[0025] Figure 4 is of the present invention Figure 1 side view;

[0026] Figure 5 is of the present invention Figure 4 A-A sectional structural schematic diagram;

[0027] Figure 6 is a replacement judgment schematic diagram when multiple groups of double-ball valves of the present invention are used.

[0028] In the figure: 100, the first valve body; 110, the valve housing; 120, the flange; 200, the second valve body; 300, the connection component; 310, the first plug-in component; 311, the low-side port; 312, the side-port screw hole; 313, the plug post; 314, the high-side port; 320, the second plug-in component; 330, the detection component; 331, the pressure gauge; 332, the through rod; 333, the fixed head; 400, the valve body detection nozzle; 500, the execution component; 510, the valve seat; 520, the rotating part; 521, the handle; 522, the valve rod; 523, the valve ball. Specific embodiments

[0029] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described for some examples can also be combined in other examples.

[0030] Example 1

[0031] Refer to Figures 1 - 6 As shown, a double-ball valve for natural gas emergency cut-off includes a valve body and an execution component 500 provided on the valve body. By rotating the execution component 500, the channels connected to both ends of the valve body are closed. The valve body includes a first valve body 100 and a second valve body 200. The ends of the first valve body 100 and the second valve body 200 are connected by a connection component 300. The connection component 300 is used to connect the channels inside the valve bodies on both sides. The connection component 300 is a detachable structure, and the first valve body 100 and the second valve body 200 are quickly disassembled through the connection component 300;

[0032] The connection component 300 includes a first plug-in component 310 and a second plug-in component 320. The orthographic projection structures of the ports of the first plug-in component 310 and the second plug-in component 320 are stepped, and the ports of the first plug-in component 310 and the second plug-in component 320 are inserted and matched with each other. Side-port screw holes 312 are provided in the middle of the inner sides of the ports of the first plug-in component 310 and the second plug-in component 320. A detection component 330 is connected to the side-port screw holes 312 by threads. The height direction of the detection component 330 is perpendicular to the length direction of the connection component 300;

[0033] The ports of the first connector 310 and the second connector 320 are divided into a low-side port 311 and a high-side port 314. A slot is provided at the low position on the connection side of the low-side port 311 and the high-side port 314, and a plug post 313 is provided at the high position on the connection side of the low-side port 311 and the high-side port 314. The specification of the plug post 313 is adapted to the slot type of the slot. Rubber rings are provided on the low-side port 311, the high-side port 314 and their connection sides. When the low-side port 311 of the first valve body 100 abuts and connects with the high-side port 314 of the second valve body 200, the high-side port 314 of the second valve body 200 and the low-side port 311 of the first valve body 100 abut and connect correspondingly. Both groups of plug posts 313 are inserted into the slots, as Figure 3 shown in the state of mating insertion. After mating insertion, the edge port screw holes 312 on the inner sides of the ports of the first connector 310 and the second connector 320 correspond to form a complete screw hole structure;

[0034] When the actuating assembly 500 of the first valve body 100 / the second valve body 200 closes the passage in the valve body, the connection relationship between the detecting member 330 and the connecting assembly 300 is released, and the second valve body 200 / the first valve body 100 moves along the length direction of the connecting assembly 300 and is removed from the double-ball valve;

[0035] The detecting member 330 includes a pressure gauge 331, a through rod 332 and a fixed head 333. The fixed head 333 is provided at the bottom end of the through rod 332. The fixed head 333 plugs the rod end of the through rod 332. The other end of the through rod 332 is connected to the pressure gauge 331. A plurality of through holes are provided on the outer side wall of the through rod 332.

[0036] Threads are provided on the outer side of the connection between the fixed head 333 and the through rod 332, and threads are also provided on the outer side of the connection between the through rod 332 and the pressure gauge 331. The threads are adapted to the threads in the edge port screw holes 312.

[0037] Both the first valve body 100 and the second valve body 200 include a valve housing 110 and a flange 120. The flange 120 is provided on the side of the valve housing 110 away from the connection assembly 300. A connection port is provided on one side of the valve housing 110, and a valve body detection nozzle 400 is provided in the connection port. The connection port is communicated with the connection parts of the valve housing 110 and the valve stem 522. The valve body detection nozzle 400 is used to detect the connection sealing performance between the valve stem 522 and the valve housing 110. A one-way structure is provided inside the valve body detection nozzle 400. The one-way structure includes a sealing plate. A rod body is connected to the middle of the sealing plate, and a return spring is sleeved on the rod body. During daily use, the return spring is in a stretched state, driving the sealing plate to block the port of the valve body detection nozzle 400. During detection, the detection end is inserted into the valve body detection nozzle 400 to push open the sealing plate. The detection end is connected to a device for detecting natural gas leakage. This device for detecting natural gas leakage is a prior art, so it will not be elaborated here. The one-way structure is also a conventional setting, only to ensure the sealing performance of the valve seat 510 in the non-detection state. In the detection state, the sealing performance of the connection between the valve housing 110 and the valve stem 522 can be detected, excluding the reason for the emergency state of natural gas being caused by the sealing problem of the valve itself. That is, only the pipeline between the two needs to be replaced. If a sealing problem of the valve body is detected, the corresponding valve body structure is replaced;

[0038] The actuating assembly 500 includes a valve seat 510 and a rotating member 520. The valve seat 510 is provided on the top of the valve housing 110, and the rotating member 520 is arranged perpendicular to the valve seat 510. The bottom end of the rotating member 520 extends into the channel inside the valve housing 110. The rotating member 520 includes a handle 521, a valve stem 522, and a valve ball 523. The valve stem 522 is connected between the handle 521 and the valve ball 523. An expansion part is provided inside the valve housing 110. The valve ball 523 is driven to rotate 0 - 90° inside the expansion part by the handle 521 and the valve stem 522. A channel is provided in the middle of the valve ball 523. When rotated by ninety degrees, this channel forms a ninety-degree angle with the channel inside the valve body to achieve blocking.

[0039] It should be added that the first valve body 100 and the second valve body 200 are made of brass or stainless steel, and the connection assembly 300, the through rod 332, and the fixed head 333 are all made of brass. The selection of materials is to improve the corrosion resistance of the double-ball valve and enhance the use stability of the valve.

[0040] When this double-ball valve is installed on a pipeline, the flange 120 ends of the first valve body 100 and the second valve body 200 are both connected to the pipeline through threads. Then, the connection assembly 300 of the first valve body 100 and the second valve body 200 is inserted into each other. When inserting, the insertion post 313 is correspondingly inserted into the slot, and the low side port 311 and the high side port 314 are abutted and sealed against each other. In the detection member 330, the fixed head 333 first passes through the side port screw hole 312 located on the upper side through threads and is then fixed to the side port screw hole 312 on the lower side, forming a stable connection structure. At this time, the connection assembly 300 between the first valve body 100 and the second valve body 200 is stably fixed. At the same time, the natural gas passing through the inner channel of the valve body can also enter the pressure gauge 331 through the through hole on the through rod 332, and the pressure gauge 331 can detect the pressure at the position of this double-ball valve in real time;

[0041] The first insertion member 310 and the second insertion member 320 are fixed through a mortise and tenon structure. Among them, the through rod 332 for detecting pressure also serves as a tenon rod. The connection structure of the first insertion member 310 and the second insertion member 320 improves the anti-torsion effect at the connection position of the first valve body 100 and the second valve body 200. At the same time, by using the vertical fixation of the detection member 330, the radial tensile effect at the connection position of the first valve body 100 and the second valve body 200 is improved;

[0042] When disassembling, only need to screw up the through rod 332 connected to the pressure gauge 331 upwards. At this time, the threads on the fixed head 333 and the through rod 332 are both disengaged from the side port screw hole 312. At this time, only need to move towards each other along the first insertion member 310 and the second insertion member 320 to realize the quick disassembly operation of the first valve body 100 and the second valve body 200.

[0043] Embodiment 2

[0044] Refer to Figure 6 As shown, a method for judging the disassembly position of a double-ball valve for natural gas emergency cut-off. This method is used to judge the disassembly position of the first valve body 100 / second valve body 200 of the double-ball valve for natural gas emergency cut-off and the pipeline connected thereto. Specifically, it includes the following steps:

[0045] S1: A set of double-ball valves need to be installed at both the output end and the input end of the natural gas pipeline, and several sets of double-ball valves can also be set on the conveying path of the natural gas pipeline. The number of double-ball valves on the natural gas pipeline is at least two groups;

[0046] That is, there may be no double-ball valves on the conveying path of the natural gas pipeline, and there are only two sets of valves, which are located at the input end and the output end respectively;

[0047] S2: The double-ball valve at the output end is A, the double-ball valve at the input end is C, and the double-ball valve located on the natural gas pipeline conveying path is B. The pipeline between the double-ball valve at the output end and the double-ball valve at the input end is AC;

[0048] That is, the number of Bs can be 0. At this time, the pipeline AC is a complete pipeline. Similarly, when the number of Bs is n (n ≥ 0, n = 1, 2, 3...), the pipeline AC is divided into n segments;

[0049] S3: When the natural gas is in an emergency cut-off state, it is judged by the value of the pressure gauge 331 on the double-ball valve that the part of the pipeline in emergency cut-off is located on AC or AB / BC;

[0050] As Figure 6 shown, the number of Bs is 1. At this time, there are three groups of double-ball valves. If the damaged valve body or pipeline is located on AB, it can be judged by whether the numerical difference of the pressure gauge 331 on AB exceeds the standard value after the pressure loss of the pipeline conveying. The pressure loss of the pipeline conveying means that when natural gas is conveyed in pipelines of different lengths, the pressure of the natural gas decreases due to loss. The longer the conveying path, the greater the pressure loss. The pressure loss is related to pipeline friction, pipeline diameter reduction, valves, and flow meters. The specifications of the national standard natural gas conveying pipeline are: diameter 219mm - 3620mm; wall thickness 5mm - 26mm; material L245 - L555. The standard value of its pressure loss is that the standard value of the pressure loss per 100 meters is between 0.1% and 0.2%;

[0051] S4: Close the first valve body 100 / second valve body 200 in A, remove the second valve body 200 / first valve body 100 in A, and close the second valve body 200 / first valve body 100 in C, remove the first valve body 100 / second valve body 200 in C, and remove AC connected between the valve bodies on both sides together;

[0052] In step S3, if it is judged that the valve body or pipeline connected to AB is in an emergency treatment state, it is necessary to remove the first valve body 100 / second valve body 200 on A, and at the same time remove the second valve body 200 / first valve body 100 on B. Then reconnect a new double-ball valve to the second valve body 200 / first valve body 100 and the first valve body 100 / second valve body 200 on A and B. After connecting the pipeline, check the value of the pressure gauge 331 until the pressure loss between the two groups of double-ball valves meets the standard value.

[0053] The above describes the embodiments of this example, but this example is not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this example, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this example.

Claims

1. A double-ball valve for natural gas emergency cut-off, comprising a valve body and an actuator assembly (500) provided on the valve body. By rotating the actuator assembly (500), the channels connected to both ends of the valve body are closed. It is characterized in that, The valve body includes a first valve body (100) and a second valve body (200). The ends of the first valve body (100) and the second valve body (200) are connected by a connecting component (300). The connecting component (300) is used to connect the channels in the valve bodies on both sides. The connecting component (300) is a detachable structure, and the first valve body (100) and the second valve body (200) are quickly disassembled through the connecting component (300). The connecting component (300) includes a first plug-in part (310) and a second plug-in part (320). The orthographic projection structures of the ports of the first plug-in part (310) and the second plug-in part (320) are stepped, and the ports of the first plug-in part (310) and the second plug-in part (320) are inserted and matched with each other. Side port screw holes (312) are provided in the middle of the inner sides of the ports of the first plug-in part (310) and the second plug-in part (320). A detecting part (330) is connected in the side port screw holes (312) by threads. The height direction of the detecting part (330) is perpendicular to the length direction of the connecting component (300). When the actuating component (500) of the first valve body (100) / the second valve body (200) closes the channel in the valve body, the connection relationship between the detecting part (330) and the connecting component (300) is released, and the second valve body (200) / the first valve body (100) moves along the length direction of the connecting component (300) and is removed from the double-ball valve. The ports of the first plug-in part (310) and the second plug-in part (320) are divided into a low side port (311) and a high side port (314). A slot is provided at the low position on the connecting side of the low side port (311) and the high side port (314), and a plug post (313) is provided at the high position on the connecting side of the low side port (311) and the high side port (314). The specification of the plug post (313) is adapted to the groove type of the slot.

2. The double-ball valve for natural gas emergency cut-off according to claim 1, characterized in that, Gaskets are provided on the low side port (311), the high side port (314) and their connecting sides.

3. The double-ball valve for natural gas emergency shut-off according to claim 2, wherein, The detecting part (330) includes a pressure gauge (331), a through rod (332) and a fixed head (333). The fixed head (333) is arranged at the bottom end of the through rod (332). The fixed head (333) plugs the rod end of the through rod (332). The other end of the through rod (332) is connected to the pressure gauge (331). A plurality of through holes are provided on the outer side wall of the through rod (332).

4. A double-ball valve for natural gas emergency shutdown according to claim 3, characterized in that, Threads are provided on the outer side of the connection between the fixed head (333) and the through rod (332), and threads are also provided on the outer side of the connection between the through rod (332) and the pressure gauge (331). The threads are adapted to the threads in the side port screw holes (312).

5. A double-ball valve for natural gas emergency shut-off according to claim 4, characterized in that, Both the first valve body (100) and the second valve body (200) include a valve housing (110) and a flange (120). The flange (120) is arranged on the side of the valve housing (110) away from the connecting component (300).

6. The double-ball valve for natural gas emergency cut-off according to claim 5, characterized in that, The actuating component (500) includes a valve seat (510) and a rotating part (520). The valve seat (510) is arranged at the top of the valve housing (110), and the rotating part (520) is arranged perpendicular to the valve seat (510). The bottom end of the rotating part (520) extends into the channel in the valve housing (110).

7. A double-ball valve for natural gas emergency shut-off according to claim 6, characterized in that, The rotating member (520) includes a handle (521), a valve stem (522), and a valve ball (523). The valve stem (522) is connected between the handle (521) and the valve ball (523). An expansion portion is provided inside the valve housing (110). The valve ball (523) is driven by the handle (521) and the valve stem (522) to rotate 0 - 90° within the expansion portion.

8. A double-ball valve for natural gas emergency shutdown according to claim 7, characterized in that, One side of the valve housing (110) is provided with a connection port, and a valve body detection nozzle (400) is provided inside the connection port. The connection port is communicated with the connection parts of the valve housing (110) and the valve stem (522). The valve body detection nozzle (400) is used to detect the connection sealing performance between the valve stem (522) and the valve housing (110).

9. A method for determining the removal position of a double-ball valve for natural gas emergency cut-off, which is used to determine the removal position of the first valve body (100) / second valve body (200) of a double-ball valve for natural gas emergency cut-off as described in claim 8 and the pipelines connected thereto, characterized in that, It includes the following steps: S1: A set of double - ball valves need to be installed at both the output end and the input end of the natural gas pipeline, and several sets of double - ball valves are also arranged on the conveying path of the natural gas pipeline. The number of double - ball valves on the natural gas pipeline is at least two sets. S2: The double - ball valve at the output end is A, the double - ball valve at the input end is C, and the double - ball valves on the conveying path of the natural gas pipeline are B. The pipeline between the double - ball valve at the output end and the double - ball valves on the conveying path of the natural gas pipeline is AB; the pipeline between the double - ball valve at the input end and the double - ball valves on the conveying path of the natural gas pipeline is BC. S3: When the natural gas is in an emergency cut - off state, it is judged by the value of the pressure gauge (331) on the double - ball valve that the part of the pipeline in emergency cut - off is located on AB or BC. S4: Close the first valve body (100) / second valve body (200) in A, remove the second valve body (200) / first valve body (100) in A, and close the second valve body (200) / first valve body (100) in B, remove the first valve body (100) / second valve body (200) in B, and remove AB connected between the two side valve bodies together. Or, close the first valve body (100) / second valve body (200) in B, remove the second valve body (200) / first valve body (100) in B, and close the second valve body (200) / first valve body (100) in C, remove the first valve body (100) / second valve body (200) in C, and remove BC connected between the two side valve bodies together.

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