CN108253300A - Underground pressure regulating box - Google Patents
Underground pressure regulating box Download PDFInfo
- Publication number
- CN108253300A CN108253300A CN201611233399.3A CN201611233399A CN108253300A CN 108253300 A CN108253300 A CN 108253300A CN 201611233399 A CN201611233399 A CN 201611233399A CN 108253300 A CN108253300 A CN 108253300A
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- Prior art keywords
- box
- valve
- lower box
- pressure
- welded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 23
- 230000033228 biological regulation Effects 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 7
- 238000003795 desorption Methods 0.000 claims abstract 2
- 238000009434 installation Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 17
- 239000000567 combustion gas Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
A kind of Underground pressure regulating box, including blow-down pipe and the upper box, lower box and pressure regulation core that are placed in subsurface, multiple interfaces are welded on blow-down pipe, upper box and lower box are assembled integrally, form on upper box is installed, openable upper cover is connected at the top of upper box.Upper box surrounding, which is welded with, diffuses interface and check-valves interface passes through connection by metal hose with the interface on desorption tube respectively；Lower box includes inlet valve, inlet tube, outlet, outlet valve and pressure regulation core, one end of inlet valve and inlet tube connects, the other end of inlet tube is welded with lower box, one end of outlet valve and outlet connects, the other end of outlet is welded with lower box, and pressure regulation core is mounted on inside lower box；The pressure regulation core is made of operation equipment and main voltage regulator.The apparatus structure is compact, safe and reliable, it can be achieved that gas pressure regulating voltage stabilizing, parameter are shown and superpressure diffuses cut-out.
Description
Technical field：
The invention belongs to the Gas Regulator in a kind of gas transmission and distribution system, more particularly to a kind of Underground pressure regulation
Case.
Background technology：
Domestic conventional gas pressure regulating box largely to arrange on the ground, and box house is by pipeline by valve, filter, pressure regulation
Device etc. is connected in turn.There are following defects for this Rose Box：1st, occupied space is big, safeguards complicated.2nd, part box house
Ground is moist, ventilation is not smooth, and device therefor easily corrodes, and there are security risks.3rd, most batch meters are arranged in beside road, are held
Sight easily is blocked, the uncivil behavior of some passerbys in addition causes tank surface cut significantly to have spot, influences beauty.4th, exist
The risk of gas leakage is caused by Vehicular impact.5th, babinet is easy to be opened, and there is be illegally modified parameter and cut-out combustion gas
The risk of supply.
Invention content：
The purpose of the present invention, which is that, overcomes above-mentioned the deficiencies in the prior art, provides a kind of Underground pressure regulation dress
It puts, the apparatus structure is compact, safe and reliable, it can be achieved that gas pressure regulating voltage stabilizing, parameter are shown and superpressure diffuses cut-out.
As above conceive, technical scheme is as follows：
A kind of Underground pressure regulating box, including blow-down pipe and the upper box, lower box and pressure regulation core that are placed in subsurface, emptying
Multiple interfaces are welded on pipe, upper box and lower box are assembled integrally, and form is equipped on upper box, is connected at the top of upper box
There is openable upper cover；It is characterized in that：Upper box surrounding be welded with diffuse interface and check-valves interface respectively on blow-down pipe
Interface pass through connection by metal hose；Lower box includes inlet valve, inlet tube, outlet, outlet valve and pressure regulation core, entrance
One end of valve and inlet tube connects, and the other end and the lower box of inlet tube weld, and one end of outlet valve and outlet connects,
The other end of outlet is welded with lower box, and pressure regulation core is mounted on inside lower box；The pressure regulation core is by operation equipment and homophony
Depressor forms, and operation equipment includes terminal pad and inlet pressure gauge mounted thereto, difference gauge, pilot valve, stop valve, ball valve
And delivery gauge, main voltage regulator are made of filter core and pressure regulator, pressure regulator is used cooperatively with pilot valve, at the difference gauge two
Pressure tappings are connected across filter core both sides.
Above-mentioned upper box surrounding is welded with expansion interface.
The inlet tube and outlet of above-mentioned lower box and the junction of lower box are welded with floor.
Above-mentioned lower box top is installed by Safety relief valve.
Above-mentioned inlet valve and outlet valve can be welded using buried welding ball valve with pipe network.
Hanging ring is installed in the terminal pad of aforesaid operations equipment.
Blowdown valve is installed in the terminal pad of aforesaid operations equipment.
The present invention has the advantage that and good effect：
1st, the present invention is integrally placed at underground, and only upper cover is above ground level a little, so there is no need to build needed for traditional pressure regulating box compared with
Big civil engineering amount, saves floor space, and avoid the shortcomings of such as blocking sight, eliminates by the risk of Vehicular impact.
2nd, the present invention by integration of equipments such as pilot valve, stop valve, filter, pressure regulator, pipelines to together, it is compact-sized,
It is small, realize efficiently using for space.
3rd, the present invention is whole makes lid-opening type babinet, and babinet is welded using steel plate, and closed place uses rubber ring
Sealing, can load-bearing, explosion-proof, waterproof, anti-leak.
4th, the present invention can be equipped with transparent window under upper-opening upper cover, and opening upper cover can facilitate the every instrument of observation to read
Number and equipment working condition conducive to inspection, and use seal with elastometic washer between transparent window and babinet, it is ensured that waterproof and dustproof,
Anti-leak.
5th, the present invention is gas leakage caused by reply equipment fault and Rig up error, and blow-down pipe is disposed by babinet, is led to
Cross metal hose on the upper box diffuse interface and check-valves interface is connected.About four meters of the blow-down pipe height, can have
Effect discharges into the atmosphere leakage combustion gas dilution.
6th, openable upper cover of the present invention needs to operate using nonstandard spanner, increases the difficulty illegally uncapped, while
Ensure that pilot valve be not illegally modified parameter and cut-out gas supply.
7th, using modularized design, internal unit can be proposed integrally the present invention, maintain easily and replace component.Pressure regulation core by
Terminal pad and instrument mounted thereto, filter core and pressure regulator composition, can integrally propose, realize modularization repair easy to disassemble
Function.
8th, the present invention is internal can connect sensor (or gas is led to external sensor by stainless steel capillary), sense
Device line is connected to external integrated electronic instrument box, and can not have to unlatching pressure regulation box cover just can conveniently check equipment work feelings
Condition, such as temperature, pressure and other parameters；Parameter stored record also can be copied to outside by parameter teletransmission to operating room by instrument box
Storage device.
Description of the drawings：
Fig. 1 is the front view of the present invention；
Fig. 2 is the vertical view of the present invention；
Fig. 3 is present device meter diagram；
Fig. 4 is blow-down pipe schematic diagram；
Fig. 5 is integrated instrument box schematic diagram.
The title of each component is in figure：
1- inlet valves；2- inlet tubes；3- pressure regulation cores；4- upper boxes；5- upper covers；6- floors；7- outlets；8- outlet valves
Door；9- lower boxes；10- forms；11- diffuses interface；12- expansion interfaces one；13- expansion interfaces two；14- check-valves interfaces；15-
Inlet pressure gauge；16- terminal pads；17- difference gauges；18- Safety relief valves；19- blowdown valves；20- pressure vessels；21- pilot valves；
22- stop valves；23- hanging rings；24- ball valves；25- delivery gauges；26- interfaces；27- blow-down pipes；28- integrated electronic instrument boxs；
29- casees are locked；30- case lids；31- integrates instrument.
Specific embodiment：
A kind of Underground pressure regulating box, including blow-down pipe and the upper box, lower box and pressure regulation core that are placed in subsurface.Top box
Installation and operating space of the body for instrumentation pass through bolt and lower box connecting plate installation composition one.Upper box and nowel
Rubber cushion is accompanied between body connecting plate to reach sealing water-proof function.
First, upper box structure explanation：
1st, 4 top of upper box is equipped with unilateral open-type upper cover 5 by nonstandard bolt, and upper cover open side is welded with handle,
Conveniently lift upper cover.5 surrounding of upper cover is sealed upper cover 5 and 4 seam crossing of upper box when upper cover covers tightly equipped with a circle sealing strip
Item tamps, and reaches sealing waterproof anti-leak function.
2nd, 5 middle part of upper cover is welded with stiffener plate, can improve upper cover rigidity in the case where weightening is few, increase can load-bearing
Amount.
3rd, form 10 is installed in upper box 4.Form by a general frame install water white transparency light-high-strength plate, four
Week is embedded with rubber ring.Form is integrally fixed on by wing nut in upper box 4, is formed one of interlayer to internal unit, can be prevented
Water and dust enter lower space, while can also prevent the combustion gas of leakage from entering form and the space in upper cover.Form 10 with it is upper
Lid 5 forms two seals, improves safety.
4th, 4 surrounding of upper box, which is welded with, diffuses interface 11, check-valves interface 14, expansion interface 1, expansion interface 2 13,
It can be respectively used to signal pipe of installation check-valves, the outlet connecting leg of Safety relief valve 18 and other purposes etc..
5th, check-valves is installed on check-valves interface 14, it can be ensured that internal unit occur gas leakage when combustion gas can and
When spilt into air by the blow-down pipe of check-valves and connected metal hose into four meters above ground level.The peace of check-valves
Dress is eliminated because internal gas leakage makes form and upper cover bear gaseous-pressure gas injection when checking maintenance opens upper cover and go out to occur
Dangerous hidden danger；It can so that the combustion gas stream of leakage goes out babinet and external humid air can not flow into using check-valves, avoid
Air fuel gas mixed gas is formed, reduces potential explosion danger, while also avoid equipment caused by inner air humidity
Corrosion.
2nd, lower box structure explanation：
1st, lower box 9 is mainly welded by inlet valve 1, inlet tube 2, outlet 7, outlet valve 8.Inlet tube 2 goes out
Mouth pipe 7 is welded with floor 6 with 9 junction of lower box, to improve integral strength, avoids because of welding pipe network sedimentation increase discrepancy nozzle
Pulling force between cylinder weld seam makes the risk of welding seam breaking.Entry and exit valve uses buried welding ball valve, can be welded with pipe network
It connects.
2nd, lower box top installation Safety relief valve 18, after outlet pressure is higher than and diffuses setting value, Safety relief valve 18
Action, ensures that way of escape pressure no longer rises discharging by way of combustion gas in outlet.
3rd, installation pressure regulation core 3 in lower box.Pressure regulation core 3 is made of operation equipment and main voltage regulator.Equipment is operated by connecting
Disk 16 and inlet pressure gauge 15 mounted thereto, difference gauge 17, pilot valve 21, stop valve 22, hanging ring 23, ball valve 24 and outlet
Pressure gauge 25 forms.Pressure regulator is separate unit indirect acting type, axial flow pressure regulator, is used cooperatively with pilot valve 21.
1. stop valve 22 can set cut-out pressure value, valve events are cut off when exit pressure levels are more than cut-out pressure value, are closed
Close pressure regulator entrance.
2. pressure tappings are connected across filter core both sides at 17 liang of difference gauge, filter core both sides generate pressure drop when filter core blocks,
Difference gauge 17 shows reading.Filter core clean-up performance can determine whether by reading to replace filter core in time.
Integral lifting provides lifting point when 3. hanging ring 23 is installation and checking maintenance.
4. pipe network is caused to be intake in view of slipping up in practical application there are gas ductwork because of construction, and then also big inside pressure regulating box
Amount water inlet and combustion gas not dry zone water situation, therefore blowdown valve 19 is set on lower box, it is connected under blowdown valve stainless
Steel pipe leads directly to babinet minimum point.Can not have to integral demounting in water entering accident can discharge sewage recovery gas supply, treat that accident is thorough
Integral demounting processing is done after processing again.
5. ball valve 24 is communicated with inside, gas access way can be provided in test and checking maintenance.
6. inlet pressure gauge 15 can real-time display pressure regulating box inlet and outlet pressure with delivery gauge 25.
7. main voltage regulator is mainly made of filter core and pressure regulator, gas first enters back into pressure regulator after filter element filtering.Pressure regulation
Device is single flow indirect acting type, is used cooperatively with pilot valve 21.Pressure regulator aperture can be controlled by adjusting pilot valve 21
And then outlet pressure is adjusted, and by outlet pressure stabilization in setting value.Pressure regulator is fail close formula, i.e. pressure regulator breaks down
When will turn off pressure regulation access, will not cause because of failure back outlet pressure rise.
3rd, blow-down pipe 27 is after setting, and four meters above ground level of top nozzle, lower weld has interface 26, which passes through
Metal hose and pressure regulating box diffuse interface 11,14 interface of check-valves connects, according to different situations also can with expansion interface 1,
Expansion interface 2 13 connects.Integrated electronic instrument box 28 can be equipped on blow-down pipe simultaneously, pressure regulating box is not openedly played in realization
Observation device parameters and to data carry out the functions such as Macro or mass analysis and teletransmission.The integrated electronic instrument box has following spy
Point：
1st, internal integrated electronic instrument is monolithic devices, can connect multiple signals, such as temperature, pressure, flow signal, can be real
When be shown on liquid crystal display；
2nd, recording frequency can be set and parameter that stored record arrives, and store operation note, can to the parameter of storage and
The reading of operation note and deletion setting associated rights, conveniently check and ensure that data are true；
3rd, equipped with USB interface, movable storage device and computer can be connected, facilitates export data and modification systematic parameter；
4th, can outer signal line also can wirelessly teletransmission to monitoring room computer, be run in equipment by external equipment
When there is abnormal and relevant parameter (such as temperature, pressure, interior storage capacity) and reaches setting value in situation, can integrated instrument with
Sound-light alarm is realized on monitoring room computer；
5th, every integrated instrument is signed with unique hardware digital, it is ensured that modification parameter can only be by specified professional
In integrated instrument or the calculating hands- operation of connection.
The present invention the course of work be：
Fuel gas from fecder system network enters from intake line and inlet valve inside the pressure regulating box of underground, through pressure regulation core
Enter pressure regulator after inner filter core filtering, enter low-pressure pipe network through outlet outflow pressure regulating box after pressure regulation.It is controlled and adjusted by pilot valve
Depressor adjusts setting outlet pressure.After outlet pressure is more than Safety relief valve setting pressure, Safety relief valve automatic relief,
Gas enters blow-down pipe via metal hose and spills into air；When pressure regulating box outlet pressure sets pressure beyond stop valve
Afterwards, valve events are cut off, close pressure regulator access.In actual use can more parallel connections in groups, separate unit failure when need to repair only
This entrance valve need to be closed, without influencing whole ventilation.
Claims (7)
1. a kind of Underground pressure regulating box, including blow-down pipe and the upper box, lower box and pressure regulation core that are placed in subsurface, blow-down pipe
On be welded with multiple interfaces, upper box and lower box are assembled integrally, and are equipped with form on upper box, are connected at the top of upper box
Openable upper cover；It is characterized in that：Upper box surrounding be welded with diffuse interface and check-valves interface respectively on desorption tube
Interface passes through connection by metal hose；Lower box includes inlet valve, inlet tube, outlet, outlet valve and pressure regulation core, inlet valve
Door is connect with one end of inlet tube, and the other end and the lower box of inlet tube weld, and one end of outlet valve and outlet connects, and goes out
The other end of mouth pipe is welded with lower box, and pressure regulation core is mounted on inside lower box；The pressure regulation core is by operation equipment and main pressure regulator
Device forms, operation equipment include terminal pad and inlet pressure gauge mounted thereto, difference gauge, pilot valve, stop valve, ball valve and
Delivery gauge, main voltage regulator are made of filter core and pressure regulator, and pressure regulator is used cooperatively with pilot valve, are taken at the difference gauge two
Pressure mouth is connected across filter core both sides.
2. Underground pressure regulating box according to claim 1, it is characterised in that：Above-mentioned upper box surrounding is welded with extension and connects
Mouthful.
3. Underground pressure regulating box according to claim 1, it is characterised in that：The inlet tube and outlet of above-mentioned lower box
Floor is welded with the junction of lower box.
4. Underground pressure regulating box according to claim 1, it is characterised in that：Above-mentioned lower box top installation safety is diffused
Valve.
5. Underground pressure regulating box according to claim 1, it is characterised in that：Above-mentioned inlet valve and outlet valve use
Buried welding ball valve can be welded with pipe network.
6. Underground pressure regulating box according to claim 1, it is characterised in that：It is installed in the terminal pad of aforesaid operations equipment
There is hanging ring.
7. Underground pressure regulating box according to claim 1, it is characterised in that：It is installed in the terminal pad of aforesaid operations equipment
There is blowdown valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611233399.3A CN108253300A (en) | 2016-12-28 | 2016-12-28 | Underground pressure regulating box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611233399.3A CN108253300A (en) | 2016-12-28 | 2016-12-28 | Underground pressure regulating box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108253300A true CN108253300A (en) | 2018-07-06 |
Family
ID=62720068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611233399.3A Pending CN108253300A (en) | 2016-12-28 | 2016-12-28 | Underground pressure regulating box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108253300A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109253395A (en) * | 2018-11-15 | 2019-01-22 | 特瑞斯能源装备股份有限公司 | A kind of high leakproofness underground voltage regulating station |
| CN110393991A (en) * | 2019-08-28 | 2019-11-01 | 上海飞奥燃气设备有限公司 | Buried gas filter |
| CN113719756A (en) * | 2021-10-09 | 2021-11-30 | 河北瑞星燃气设备股份有限公司 | Direct-buried underground pressure regulating box and using method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2375851Y (en) * | 1998-12-31 | 2000-04-26 | 天津市天然气公司 | Gas underground pressure regulator |
| CN203797351U (en) * | 2014-04-08 | 2014-08-27 | 乐山市山鹰模具有限责任公司 | Fully-balanced gas pressure regulator system |
| CN204647860U (en) * | 2015-04-09 | 2015-09-16 | 黄金萍 | Underground pressure-regulating box |
| CN204649248U (en) * | 2015-04-09 | 2015-09-16 | 黄金萍 | Underground batch meter |
| CN205806943U (en) * | 2016-05-18 | 2016-12-14 | 王翔宇 | Underground pressure regulating box |
-
2016
- 2016-12-28 CN CN201611233399.3A patent/CN108253300A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2375851Y (en) * | 1998-12-31 | 2000-04-26 | 天津市天然气公司 | Gas underground pressure regulator |
| CN203797351U (en) * | 2014-04-08 | 2014-08-27 | 乐山市山鹰模具有限责任公司 | Fully-balanced gas pressure regulator system |
| CN204647860U (en) * | 2015-04-09 | 2015-09-16 | 黄金萍 | Underground pressure-regulating box |
| CN204649248U (en) * | 2015-04-09 | 2015-09-16 | 黄金萍 | Underground batch meter |
| CN205806943U (en) * | 2016-05-18 | 2016-12-14 | 王翔宇 | Underground pressure regulating box |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109253395A (en) * | 2018-11-15 | 2019-01-22 | 特瑞斯能源装备股份有限公司 | A kind of high leakproofness underground voltage regulating station |
| CN110393991A (en) * | 2019-08-28 | 2019-11-01 | 上海飞奥燃气设备有限公司 | Buried gas filter |
| CN110393991B (en) * | 2019-08-28 | 2024-04-30 | 上海飞奥燃气设备有限公司 | Buried gas filter |
| CN113719756A (en) * | 2021-10-09 | 2021-11-30 | 河北瑞星燃气设备股份有限公司 | Direct-buried underground pressure regulating box and using method thereof |
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