Special valve for collecting biogas in HDPE (high-density polyethylene) pipeline and manufacturing method of special valve

Abstract

The invention relates to the field of valves, in particular to a special HDPE pipeline biogas collection valve and a manufacturing method thereof.The special HDPE pipeline biogas collection valve comprises a positioning connecting flange, a blocking pipe, a biogas collection pipeline, a biogas diversion three-way pipe and a discharge pipe used for extracting biogas, and the biogas diversion three-way pipe is communicated with the biogas collection pipeline, the discharge pipe and a biogas detection port; a control valve is arranged on the discharge pipe; the positioning connecting flange is detachably arranged on the biogas collecting pipeline, the blocking pipe is arranged on the positioning connecting flange, and the blocking pipe is connected with the biogas collecting pipeline through a supporting device; the length of the blocking pipe below the positioning connecting flange is greater than that of the biogas collecting pipeline below the positioning connecting flange; and communicating holes are uniformly distributed in the blocking pipe.

Description

Technical Field

[0001] The present invention relates to the field of valves, and more specifically, to a special valve for collecting biogas in a HDPE pipeline and a manufacturing method thereof. Background Art

[0002] In some densely populated areas, for the sake of sustainable development, people will collect excrement or organic matter in batches, and then ferment the excrement or organic matter in a fermentation tank, so that the excrement or organic matter decomposes into a large amount of biogas and a liquid containing a large amount of organic molecules. The biogas can be used for combustion and heating, while the liquid containing a large amount of organic molecules can be used for irrigation of crops, which not only saves resources but also makes the land more fertile.

[0003] However, at present, during the fermentation process of excrement or organic matter, people do not know the fermentation status of excrement or organic matter in the fermentation tank, nor the concentration of biogas and the height of liquid in the fermentation tank. Therefore, each time, the concentration of biogas and the height of liquid can only be measured after opening the connecting flange of the biogas collection valve. However, since the installation and disassembly of the flange is relatively complicated and larger tools are required to disassemble the flange of the biogas collection valve, a valve body that can facilitate people to detect and collect the concentration of biogas is exactly what is needed.

[0004] Therefore, it is necessary to propose a special valve for collecting biogas in HDPE pipelines and a manufacturing method thereof for solving the above problems. Summary of the invention

[0005] In order to overcome at least one defect (shortcoming) of the above-mentioned prior art, the present invention provides a special valve for collecting biogas in a HDPE pipeline and a manufacturing method thereof.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows: a special valve for collecting biogas in HDPE pipelines, comprising a positioning connection flange, a barrier pipe, a biogas collection pipeline, a biogas diversion tee pipe and a discharge pipe for extracting biogas;

[0007] The biogas diversion three-way pipe is respectively connected to the biogas collection pipeline, the discharge pipe and the biogas detection port, and the discharge pipe is provided with a control valve;

[0008] The positioning connection flange is detachably arranged on the biogas collection pipe, the barrier pipe is arranged on the positioning connection flange, and the barrier pipe is connected to the biogas collection pipe via a support;

[0009] The length of the barrier pipe below the positioning connection flange is greater than the length of the biogas collection pipe below the positioning connection flange;

[0010] The barrier tube is evenly provided with connecting holes. Since the biogas diversion tee is respectively connected with the biogas collecting pipe, the discharge pipe and the biogas detection port, when maintenance personnel detect the biogas concentration in the fermentation tank, they no longer need to use large tools to open the positioning connection flange. They only need to open the biogas detection port and insert the detection instrument to detect the biogas concentration, liquid height and other data in the fermentation tank. Since the length of the barrier tube below the positioning connection flange is greater than the length of the biogas collecting pipe below the positioning connection flange, the barrier tube can allow biogas to enter from multiple directions and angles when biogas enters, thereby making the measurement of biogas concentration more accurate.

[0011] Furthermore, a limiting protrusion with an external thread is provided on the biogas collection pipe, and a mounting hole with an internal thread is provided on the positioning connecting flange. The positioning connecting flange is sleeved on the limiting protrusion with an external thread through the mounting hole with an internal thread. The setting of the limiting protrusion facilitates the fixing of the positioning connecting flange on the limiting protrusion.

[0012] Furthermore, it also includes a positioning reinforcement sleeve, the limiting protrusion and the biogas diversion three-way pipe are both provided with latching teeth, the inner side of the positioning reinforcement sleeve is provided with a latching groove matching the latching teeth, and the positioning reinforcement sleeve is locked with the limiting protrusion and the latching teeth on the biogas diversion three-way pipe through the latching groove;

[0013] A first metal locking band is provided on the outer side of the positioning reinforcement sleeve. By providing latch teeth on the limiting protrusion and the biogas diversion tee, a latch groove matching the latch teeth is provided on the inner side of the positioning reinforcement sleeve, and then the positioning reinforcement sleeve is fastened between the biogas collection pipe and the biogas diversion tee by binding with the first metal locking band.

[0014] Furthermore, the support device includes a support baffle, a support collar and a limiting groove arranged in the support collar;

[0015] The biogas collection pipe is provided with an inclined limiting protrusion;

[0016] The support baffle is arranged on the outside of the support collar. When the support collar is sleeved on the biogas collection pipe, the limit groove on the support collar is clamped on the inclined limit protrusion of the biogas collection pipe.

[0017] A second metal locking band is sleeved on the outer side of the support collar. Since an inclined limiting protrusion is provided on the biogas collection pipe, the limiting groove on the support collar can be well clamped on the inclined limiting protrusion to realize the installation and fixation of the support device. The second metal locking band can strengthen the fixation of the support collar.

[0018] Furthermore, it also includes a locking screw with a sealing ring, and the biogas detection port is provided with a locking thread. The locking screw with a sealing ring and the locking thread on the biogas detection port are locked with each other. By providing a locking screw with a sealing ring on the biogas detection port, it is convenient to detect biogas concentration and the like.

[0019] Furthermore, heat welding is adopted between the biogas collection pipe and the biogas diversion tee pipe, between the positioning connection flange and the barrier pipe, and between the barrier pipe and the support baffle. By heat welding, the sealing connection and mutual fixation between the related components can be conveniently achieved.

[0020] Furthermore, the biogas collection pipe, the barrier pipe, the support baffle and the positioning connection flange are sealed with each other to form a sealed space, and inert gas is filled in the sealed space. In the prior art, if the amount of biogas in the fermentation tank is not detected and used for a long time, the amount of biogas in the fermentation tank will be very high. At this time, the biogas will exert pressure on the sealed space. Therefore, the support baffle of the traditional biogas collection dedicated valve will often be deformed or burst. However, if the biogas collection dedicated valve is not pulled out for inspection, the maintenance personnel cannot judge the deformation or burst of the support baffle. Therefore, the present invention fills inert gas in the sealed space. Therefore, if the support baffle bursts, the inert gas will leak out. When the maintenance personnel are measuring the biogas concentration, the maintenance personnel will insert the instrument into the biogas collection pipe through the biogas detection port to detect the biogas concentration. If inert gas is detected, it means that the support baffle or the barrier pipe has been cracked and needs to be checked and replaced in time.

[0021] Furthermore, reinforcing ribs are heat-melted mutually between the biogas collecting pipe, the barrier pipe, the supporting baffle and the positioning connecting flange. The overall compressive strength of the enclosed space can be enhanced by the heat-melting setting of the reinforcing ribs.

[0022] Furthermore, the positioning connecting flange, barrier tube, biogas collection pipe, biogas diversion tee and discharge pipe are all made of high-density polyethylene material. In actual applications, the positioning connecting flange, barrier tube, biogas collection pipe, biogas diversion tee and discharge pipe can also be made of other materials according to the needs of use, which are easily thought of by technical personnel in this field.

[0023] The present invention also discloses a method for manufacturing a special valve for collecting biogas in a HDPE pipeline, comprising the following steps:

[0024] S1, when producing the biogas collection pipe, the limiting protrusion and the inclined limiting protrusion are integrally formed with the biogas collection pipe, and external threads are cut on the limiting protrusion;

[0025] S2, installing the positioning connection flange on the limiting protrusion, clamping the support on the inclined limiting protrusion of the biogas collection pipe, and sleeve a second metal locking belt on the support;

[0026] S3, hot-melting the biogas diversion tee pipe and bonding it to the biogas collection pipe, arranging the positioning reinforcement sleeve between the biogas collection pipe and the biogas diversion tee pipe, and installing the first metal locking belt to lock it;

[0027] S4, setting the reinforcing ribs between the positioning connection flange, the barrier sheet, the biogas collection pipe and the support, and hot-melting the barrier sheet and bonding it between the positioning connection flange and the support, and then sealing it to form a barrier tube, at this time, a sealed cavity is formed between the positioning connection flange, the barrier tube, the biogas collection pipe and the support;

[0028] S5, filling the sealed cavity with inert gas;

[0029] S6. Screw on the locking screw with a sealing ring on the side of the biogas detection port of the biogas diversion tee pipe, and connect the control valve on the discharge pipe side of the biogas diversion tee pipe.

[0030] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0031] The HDPE pipeline biogas collection special valve disclosed in the present invention has a biogas diversion tee pipe that is respectively connected to the biogas collection pipeline, the discharge pipe and the biogas detection port. Therefore, when maintenance personnel detect the biogas concentration in the fermentation tank, they no longer need to use large tools to open the positioning connection flange. They only need to open the biogas detection port and insert the detection instrument to detect the biogas concentration, liquid height and other data in the fermentation tank. Since the length of the barrier tube below the positioning connection flange is greater than the length of the biogas collection pipeline below the positioning connection flange, the barrier tube can allow biogas to enter from multiple directions and angles when biogas enters, thereby making the biogas concentration measurement more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural schematic diagram of the first angle of the special valve for collecting biogas in HDPE pipelines in the present invention.

[0033] Figure 2 This is a structural schematic diagram of the second angle of the special valve for collecting biogas in HDPE pipelines in the present invention.

[0034] Figure 3 It is a structural schematic diagram of the third angle of the special valve for collecting biogas in HDPE pipelines in the present invention.

[0035] Figure 4 It is a schematic diagram of the structure of the special valve for collecting biogas in HDPE pipelines in the present invention after the barrier pipe and the reinforcing ribs are removed.

[0036] Figure 5 It is a schematic diagram of the structure of the special valve for collecting biogas in HDPE pipelines in the present invention after the barrier pipe, reinforcing ribs, positioning reinforcing sleeve and support are removed.

[0037] Figure 6 It is a schematic diagram of the structure of the special valve for collecting biogas in HDPE pipelines in the present invention after the barrier pipe, reinforcing ribs, positioning connection flange and support are removed.

[0038] Figure 7 It is a cross-sectional view of the special valve for collecting biogas in HDPE pipelines in the present invention.

[0039] Figure 8 It is a cross-sectional view of the special valve for collecting biogas in HDPE pipelines in the present invention after the barrier pipe and the reinforcing ribs are removed.

[0040] Fig. 9 It is an enlarged view of the special valve for collecting biogas in HDPE pipelines in the present invention at the location of the positioning reinforcement sleeve.

[0041] Fig.10 It is an enlarged view of the special valve for collecting biogas in HDPE pipelines in the present invention at the support.

[0042] In the figure, 1 is a positioning connecting flange, 2 is a barrier pipe, 3 is a biogas collection pipeline, 4 is a biogas diversion tee pipe, 5 is a discharge pipe, 6 is a biogas detection port, 7 is a control valve, 8 is a support, 9 is a connecting hole, 10 is an external thread, 11 is a limiting protrusion, 12 is an internal thread, 13 is a mounting hole, 14 is a positioning reinforcement sleeve, 15 is a latch tooth, 16 is a latch groove, 17 is a first metal locking belt, 18 is a support baffle, 19 is a support collar, 20 is a limiting groove, 21 is an inclined limiting protrusion, 22 is a second metal locking belt, 23 is a sealing ring, 24 is a locking screw, 25 is a locking thread, 26 is a sealing space, and 27 is a reinforcing rib. DETAILED DESCRIPTION

[0043] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be said that the internal connection of two components is connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and embodiments.

[0045] like Figure 1-3 As shown, a special valve for biogas collection in HDPE pipelines comprises a positioning connection flange 1, a barrier pipe 2, a biogas collection pipeline 3, a biogas diversion tee pipe 4 and a discharge pipe 5 for extracting biogas; the biogas diversion tee pipe 4 is respectively connected to the biogas collection pipeline 3, the discharge pipe 5 and the biogas detection port 6, and a control valve 7 is provided on the discharge pipe 5; the positioning connection flange 1 is detachably arranged on the biogas collection pipeline 3, the barrier pipe 2 is arranged on the positioning connection flange 1, and the barrier pipe 2 and the biogas collection pipeline 3 are connected by a support 8; the length of the barrier pipe 2 below the positioning connection flange 1 is greater than the length of the biogas collection pipeline 3 below the positioning connection flange 1; the barrier pipe 2 is evenly distributed on the barrier pipe 2. It is provided with connecting holes 9. Since the biogas diversion tee pipe 4 is respectively connected with the biogas collecting pipe 3, the discharge pipe 5 and the biogas detection port 6, when the maintenance personnel detect the biogas concentration in the fermentation tank, they no longer need to use large tools to open the positioning connecting flange 1. They only need to open the biogas detection port 6 and insert the detection instrument to detect the biogas concentration, liquid height and other data in the fermentation tank. Since the length of the barrier tube 2 under the positioning connecting flange 1 is greater than the length of the biogas collecting pipe 3 under the positioning connecting flange 1, the barrier tube 2 can allow biogas to enter from multiple directions and angles when biogas enters, so that the biogas concentration measurement is more accurate.

[0046] like Figure 4-5As shown, a limiting protrusion 11 with an external thread 10 is provided on the biogas collection pipe 3, and a mounting hole 13 with an internal thread 12 is provided on the positioning connection flange 1. The positioning connection flange 1 is sleeved on the limiting protrusion 11 with the external thread 10 through the mounting hole 13 with the internal thread 12. The setting of the limiting protrusion 11 facilitates the positioning connection flange 1 to be fixed on the limiting protrusion 11. In addition, a positioning reinforcement sleeve 14 is also included. The limiting protrusion 11 and the biogas diversion tee pipe 4 are both provided with a latch tooth 15. The inner side of the positioning reinforcement sleeve 14 is provided with a latch tooth The teeth 15 are matched with the slots 16, and the positioning reinforcement sleeve 14 is locked with the teeth 15 on the limiting protrusion 11 and the biogas diversion three-way pipe 4 through the slots 16; the outer side of the positioning reinforcement sleeve 14 is sleeved with a first metal locking belt 17, and the limiting protrusion 11 and the biogas diversion three-way pipe 4 are both provided with teeth 15, and the inner side of the positioning reinforcement sleeve 14 is provided with a slot 16 matching the teeth 15, and then the first metal locking belt 17 is bound to achieve the positioning reinforcement sleeve 14 Fastened between the biogas collection pipe 3 and the biogas diversion three-way pipe 4.

[0047] like Figure 6-10As shown, the support device 8 includes a support baffle 18, a support collar 19 and a limiting groove 20 arranged in the support collar 19; an inclined limiting protrusion 21 is arranged on the biogas collection pipe 3; the support baffle 18 is arranged on the outer side of the support collar 19, and when the support collar 19 is sleeved on the biogas collection pipe 3, the limiting groove 20 on the support collar 19 is clamped on the inclined limiting protrusion 21 of the biogas collection pipe 3;A second metal locking belt 22 is sleeved on the outside of the support collar 19. Since a tilting limit block 21 is provided on the biogas collection pipe 3, the limit groove 20 on the support collar 19 can be well clamped on the tilting limit block 21 to achieve the installation and fixation of the support device 8. The second metal locking belt 22 can strengthen the fixation of the support collar 19. In addition, it also includes a locking screw 24 with a sealing ring 23. A locking thread 25 is provided on the biogas detection port 6. The locking screw 24 with a sealing ring 23 is locked with the locking thread 25 on the biogas detection port 6. By providing a locking screw 24 with a sealing ring 23 on the biogas detection port 6, When testing the concentration, etc., it is convenient to carry out the test. Among them, hot welding is adopted between the biogas collection pipe 3 and the biogas diversion tee pipe 4, between the positioning connection flange 1 and the barrier pipe 2, and between the barrier pipe 2 and the support baffle 18. Through the hot welding method, the sealing connection and mutual fixation between the related parts can be conveniently realized. In the present invention, the biogas collection pipe 3, the barrier pipe 2, the support baffle 18 and the positioning connection flange 1 are sealed with each other to form a sealed space 26, and inert gas is poured into the sealed space 26. In the prior art, if the amount of biogas in the fermentation tank is not detected and used for a long time, the amount of biogas in the fermentation tank will be very high, and the biogas will be The sealed space 26 plays a compressive role, so the conventional dedicated valve for biogas collection will often cause the support baffle 18 to deform or burst. However, if the dedicated valve for biogas collection is not pulled out for inspection, the maintenance personnel cannot judge whether the support baffle 18 is deformed or burst. Therefore, the present invention fills the sealed space 26 with inert gas. Therefore, if the support baffle 18 bursts, the inert gas will leak out. When the maintenance personnel measure the biogas concentration, they will insert the instrument into the biogas collection pipe 3 through the biogas detection port 6 to detect the biogas concentration. If the inert gas is detected, it means that the support baffle 18 or the barrier pipe 2 is deformed or burst. If cracks have occurred, they need to be checked and replaced in time. Among them, the reinforcing ribs 27 are mutually hot-melted between the biogas collection pipe 3, the barrier pipe 2, the support baffle 18 and the positioning connection flange 1. The hot-melting setting of the reinforcing ribs 27 can strengthen the overall compressive strength of the enclosed space 26. The positioning connection flange 1, the barrier pipe 2, the biogas collection pipe 3, the biogas diversion tee pipe 4 and the discharge pipe 5 are all made of high-density polyethylene material. In actual application, the positioning connection flange 1, the barrier pipe 2, the biogas collection pipe 3, the biogas diversion tee pipe 4 and the discharge pipe 5 can also be made of other materials according to the needs of use, which are all easily thought of by those skilled in the art. ;

[0048] The present invention also discloses a method for manufacturing a special valve for collecting biogas in a HDPE pipeline, comprising the following steps:

[0049] S1, when producing the biogas collection pipe, the limiting protrusion and the inclined limiting protrusion are integrally formed with the biogas collection pipe, and external threads are cut on the limiting protrusion;

[0050] S2, installing the positioning connection flange on the limiting protrusion, clamping the support on the inclined limiting protrusion of the biogas collection pipe, and sleeve a second metal locking belt on the support;

[0051] S3, hot-melting the biogas diversion tee pipe and bonding it to the biogas collection pipe, arranging the positioning reinforcement sleeve between the biogas collection pipe and the biogas diversion tee pipe, and installing the first metal locking belt to lock it;

[0052] S4, setting the reinforcing ribs between the positioning connection flange, the barrier sheet, the biogas collection pipe and the support, and hot-melting the barrier sheet and bonding it between the positioning connection flange and the support, and then sealing it to form a barrier tube, at this time, a sealed cavity is formed between the positioning connection flange, the barrier tube, the biogas collection pipe and the support;

[0053] S5, filling the sealed cavity with inert gas;

[0054] S6. Screw on the locking screw with a sealing ring on the side of the biogas detection port of the biogas diversion tee pipe, and connect the control valve on the discharge pipe side of the biogas diversion tee pipe.

[0055] Example

[0056] In the present embodiment, the biogas diversion tee is respectively connected with the biogas collecting pipe, the discharge pipe and the biogas detection port, a control valve is arranged on the discharge pipe, a positioning connection flange is detachably arranged on the biogas collecting pipe, a barrier pipe is arranged on the positioning connection flange, the barrier pipe and the biogas collecting pipe are connected by a support, the length of the barrier pipe below the positioning connection flange is greater than the length of the biogas collecting pipe below the positioning connection flange, and connecting holes are evenly distributed on the barrier pipe. Since the biogas diversion tee is respectively connected with the biogas collecting pipe, the discharge pipe and the biogas detection port, when maintenance personnel detect the biogas concentration in the fermentation tank, they no longer need to use large tools to open the positioning connection flange. They only need to open the biogas detection port and insert the detection instrument to detect the biogas concentration, liquid height and other data in the fermentation tank. Since the length of the barrier pipe below the positioning connection flange is greater than the length of the biogas collecting pipe below the positioning connection flange, the barrier pipe can allow biogas to enter from multiple directions and angles when biogas enters, thus making biogas The concentration can be measured more accurately. In addition, since the biogas collection pipeline, the barrier tube, the support baffle and the positioning connection flange are sealed with each other to form a sealed space, and inert gas is filled in the sealed space, in the prior art, if the amount of biogas in the fermentation tank is not detected and used for a long time, the amount of biogas in the fermentation tank will be very high. At this time, the biogas will exert a pressure on the sealed space. Therefore, the support baffle of the traditional biogas collection valve will often deform or burst. However, if the biogas collection valve is not pulled out for inspection, the maintenance personnel cannot judge whether the support baffle is deformed or burst. Therefore, the present invention fills inert gas in the sealed space. Therefore, if the support baffle bursts, the inert gas will leak out. When the maintenance personnel are measuring the biogas concentration, the maintenance personnel will insert the instrument into the biogas collection pipeline through the biogas detection port to detect the concentration of biogas. If inert gas is detected, it means that the support baffle or the barrier tube has cracked and needs to be checked and replaced in time.

[0057] In the figure, the description of the positional relationship is only for illustrative purposes and should not be understood as a limitation on this patent; obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A special valve for collecting biogas in HDPE pipeline, comprising a positioning connection flange, a barrier pipe, a biogas collection pipeline, a biogas diversion tee pipe and a discharge pipe for extracting biogas, characterized in that: The biogas diversion three-way pipe is respectively connected to the biogas collection pipeline, the discharge pipe and the biogas detection port, and the discharge pipe is provided with a control valve; The positioning connection flange is detachably arranged on the biogas collection pipe, the barrier pipe is arranged on the positioning connection flange, and the barrier pipe is connected to the biogas collection pipe via a support; The length of the barrier pipe below the positioning connection flange is greater than the length of the biogas collection pipe below the positioning connection flange; The barrier tube is evenly distributed with communicating holes.

2. The HDPE pipeline biogas collection special valve according to claim 1 is characterized by: The biogas collecting pipe is provided with a limiting protrusion with external threads, the positioning connecting flange is provided with a mounting hole with internal threads, and the positioning connecting flange is sleeved on the limiting protrusion with external threads through the mounting hole with internal threads.

3. The HDPE pipeline biogas collection special valve according to claim 2 is characterized by: It also includes a positioning reinforcement sleeve, the limiting protrusion and the biogas diversion three-way pipe are both provided with latching teeth, the inner side of the positioning reinforcement sleeve is provided with a latching groove matching the latching teeth, and the positioning reinforcement sleeve is locked with the limiting protrusion and the latching teeth on the biogas diversion three-way pipe through the latching groove; A first metal locking belt is sleeved on the outer side of the positioning reinforcement sleeve.

4. The HDPE pipeline biogas collection special valve according to claim 1 is characterized by: The support device comprises a support baffle, a support collar and a limiting groove arranged in the support collar; The biogas collection pipe is provided with an inclined limiting protrusion; The support baffle is arranged on the outside of the support collar. When the support collar is sleeved on the biogas collection pipe, the limit groove on the support collar is clamped on the inclined limit protrusion of the biogas collection pipe. A second metal locking belt is sleeved on the outer side of the supporting collar.

5. The HDPE pipeline biogas collection special valve according to claim 1 is characterized by: It also includes a locking screw with a sealing ring. The biogas detection port is provided with a locking thread. The locking screw with the sealing ring and the locking thread on the biogas detection port are locked with each other.

6. The HDPE pipeline biogas collection special valve according to claim 4 is characterized by: The biogas collecting pipe and the biogas diversion tee pipe, the positioning connection flange and the barrier pipe, and the barrier pipe and the supporting baffle are all hot-melted.

7. The HDPE pipeline biogas collection special valve according to claim 4 is characterized by: The biogas collecting pipeline, the barrier pipe, the supporting baffle and the positioning connecting flange are sealed with each other to form a sealed space, and inert gas is filled in the sealed space.

8. The special valve for collecting biogas in HDPE pipeline according to claim 7, characterized in that: Reinforcing ribs are mutually heat-fused between the biogas collecting pipe, the barrier pipe, the supporting baffle and the positioning connecting flange.

9. The special valve for collecting biogas in HDPE pipeline according to claim 1, characterized in that: The positioning connection flange, the barrier pipe, the biogas collecting pipeline, the biogas diversion tee pipe and the discharge pipe are all made of high-density polyethylene material.

10. A method for manufacturing a special valve for collecting biogas in HDPE pipelines, characterized in that: The following steps are involved: S1, when producing the biogas collection pipe, the limiting protrusion and the inclined limiting protrusion are integrally formed with the biogas collection pipe, and external threads are cut on the limiting protrusion; S2, installing the positioning connection flange on the limiting protrusion, clamping the support on the inclined limiting protrusion of the biogas collection pipe, and sleeve a second metal locking belt on the support; S3, hot-melting the biogas diversion tee pipe and bonding it to the biogas collection pipe, arranging the positioning reinforcement sleeve between the biogas collection pipe and the biogas diversion tee pipe, and installing the first metal locking belt to lock it; S4, setting the reinforcing ribs between the positioning connection flange, the barrier sheet, the biogas collection pipe and the support, and hot-melting the barrier sheet and bonding it between the positioning connection flange and the support, and then sealing it to form a barrier tube, at this time, a sealed cavity is formed between the positioning connection flange, the barrier tube, the biogas collection pipe and the support; S5, filling the sealed cavity with inert gas; S6. Screw on the locking screw with a sealing ring on the side of the biogas detection port of the biogas diversion tee pipe, and connect the control valve on the discharge pipe side of the biogas diversion tee pipe.

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