CN209485935U - A kind of multistage gradient pressure stabilizing water pressure test in borehole device - Google Patents
A kind of multistage gradient pressure stabilizing water pressure test in borehole device Download PDFInfo
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- CN209485935U CN209485935U CN201920198561.5U CN201920198561U CN209485935U CN 209485935 U CN209485935 U CN 209485935U CN 201920198561 U CN201920198561 U CN 201920198561U CN 209485935 U CN209485935 U CN 209485935U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 24
- 208000005189 Embolism Diseases 0.000 claims abstract description 35
- 230000035699 permeability Effects 0.000 claims abstract description 30
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 230000003204 osmotic effect Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 abstract description 7
- 238000013480 data collection Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- 238000010998 test method Methods 0.000 description 7
- 239000002689 soil Substances 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004153 renaturation Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model relates to a kind of multistage gradient pressure stabilizing water pressure test in borehole devices, comprising: water system, multistage voltage-stabilizing system, four part of data collection system and bore closed system.Water system is made of water tank, water pump, high-pressure hose, check valve and drilling rod；Multistage voltage-stabilizing system is made of pressure stabilizing chamber, 3 threeways, 3 control valves, the relief valve of 3 required gradient pressures and water return pipeline；Data collection system is made of flow sensor, osmotic pressure sensor and DT data collecting instrument；Bore closed system surveys pressure hose by power supply case, water injecting pump, 2 control valves, upper rubber water-proof embolism, lower rubber water-proof embolism and high pressure and pressure gauge forms.The utility model is able to solve the problem of existing packer permeability test device can not be precisely controlled pressure water pressure, while the real-time acquisition of fields water injection flow in process and osmotic pressure may be implemented, and effectively increases the efficiency and quality of packer permeability test.
Description
Technical field
The utility model belongs to crack rock original position testing permeability and mortar depositing construction effect detection in-situ test device skill
A kind of art field, and in particular to multistage gradient pressure stabilizing water pressure test in borehole device.
Background technique
Water pressure test in borehole is normal in engineering geology, hydrogeologic condition prospecting and underground engineering mortar depositing construction effect detection
A kind of home position testing method seeps control measure and provides basic document to evaluate Penetration Signature and the design of crack rock.Drilling
Packer permeability test is to be isolated the test section in drilling using special sealing embolism, then with stable hydraulic pressure to being isolated
Section internal pressure water, for water by the crack around distance piece hole wall to rock mass internal penetration, the water finally permeated can tend to fixed value,
Rock And Soil Penetration Signature, rock cranny aperture, fracture filling property, grouting effect inspection are determined according to the relationship of pressure and flow
Survey etc..
Regulation water pressure test in borehole should be by three stage pressures, five stages in " hydraulic and hydroelectric engineering water pressure test in borehole regulation "
That is P1→P2→P3→P4(=P2)→P5(=P1), P1< P2< P3It carries out.P1、P2、P3Three-level pressure value be preferably respectively 0.3MPa,
0.6MPa and 1MPa；When be isolated section buried depth it is shallower when, the preferably appropriate examination section pressure that reduces is 0.1MPa, 0.3MPa and 0.6MPa.
Every first class pressure reaches stablize after, interval 1-2min observed volume variation, when flow is without lasting increase tendency, and five flows
When the difference that the difference of maximal and minmal value is less than 10% or maximal and minmal value of end value in reading is less than 1L/min, this rank
Section test can terminate, and take end value as calculated value.Test pressure is adjusted to new predetermined value, repeats above-mentioned tested
Journey, the test until completing the stage.After the completion of test, by collected data, the variation for drawing pressure P and flow Q is bent
Line determines the P-Q curve type of examination section, is to belong to A (laminar flow) type, B (turbulent flow) type, C (expansion) type, D according to curve feature
(erosion) type, E (filling) type are any, then calculate permeability rate and infiltration coefficient, calculation formula are as follows:
In formula: q is the permeability rate (Lu) for trying section；L is examination segment length；Q3For the regime flow (L/min) of phase III；P3
For the examination section pressure of phase III.
When try section be located at level of ground water hereinafter, and permeability rate q < 10Lu, P-Q curve for A (laminar flow) type when, can be under
Formula calculates Rockmass Permeabuity Coefficient:
In formula: k is the infiltration coefficient (m/d) for trying section；Q3Flow (the m in Rock And Soil is pressed into for third stage pressure3/d)；H is
Test head (m)；L is examination segment length；r0For boring radius (m).
When try section be located at level of ground water hereinafter, and permeability rate q < 10Lu, P-Q curve for B (turbulent flow) type when, use the first stage
Pressure P1(being converted into head height, calculate with m) and flow Q1Bring formula calculation permeability coefficient into.When permeability rate is larger, P-
Q curve is C (expansion) type, D (erosion) type and E (filling) type, using other Hydrogeological Test Methods measurement rock mass infiltration system
Number.
It is the size by adjusting pressure regulator valve in the technical equipment of existing packer permeability test, the adjusting of Lai Shixian pressure,
But this method have the defects that it is certain: (1) adjustment process is mainly by artificial control, and test needs repeatedly to adjust every time
Section, takes a long time, inefficiency；(2) pressure carries out estimating reading mostly in reference to the position of gauge hand, and accuracy rating is lower,
It cannot achieve the accurate control of pressure；(3) since the pressure of pressure water mainly relies on gauge hand position to carry out estimating reading,
When not can guarantee each test, pressure is consistent, therefore the comparability of data obtained is poor, and test also can not weigh
Renaturation.Defect of the existing packer permeability test equipment in terms of multistage gradient steady pressure adjusting, has limited the effect of packer permeability test
The acquisition of rate and high-precision test result.
Utility model content
For above situation, in order to overcome, existing packer permeability test device hydraulic pressure control and data acquisition program be cumbersome, precision
Low defect, the purpose of this utility model are just to provide a kind of multistage gradient pressure stabilizing water pressure test in borehole device and test method,
Operate more convenient, efficient, hydraulic pressure control is more stable, accurate, and the data of acquisition are more accurate, understanding that can be more accurate
The Penetration Signature of underground Rock And Soil provides reliable on-site parameters for correlation engineering design, and is more in line with " hydraulic and hydroelectric engineering
Water pressure test in borehole regulation " relevant regulations.
To achieve the goals above, the utility model is achieved by following technical scheme:
A kind of multistage gradient pressure stabilizing water pressure test in borehole device, including be sequentially communicated by high-pressure hose water tank, pressure
Water pump, check valve, pressure stabilizing chamber, 3 threeways, drilling rod, borehole test section；3 threeways are separately connected control valve one, control
Valve two and control valve three, control valve one, control valve two and control valve three are separately connected relief valve one, relief valve two
With relief valve three；The high-pressure hose is equipped with flow sensor and osmotic pressure sensor, flow sensor and osmotic pressure
Sensor is separately connected data collecting instrument；The pressure of relief valve one, relief valve two and relief valve three is respectively water pressure test in borehole
Required the first stage pressure, the second stage pressure and third stage pressure.
Further, the relief valve is connected to the water tank by water return pipeline.
Further, rubber water-proof embolism, lower rubber water-proof embolism is respectively set in the upper and lower side of the borehole test section,
Connection hose is connected between upper rubber water-proof embolism, lower rubber water-proof embolism；Upper rubber water-proof embolism is soft by high pressure survey pressure
Pipe is connected to water injecting pump；The water injecting pump is connected to water tank, and high pressure surveys pressure hose and is equipped with control valve four and pressure gauge, and high pressure is surveyed
Hose is pressed to be equipped with branch pipe, branch pipe is equipped with control valve five.
Further, the pressure stabilizing chamber includes pressure-resistant seal tank body, has opening on pressure-resistant seal tank body, upper opening with
Check valve is connected through high-pressure hose, and under shed is connected after high-pressure hose is drawn with threeway.
Water pressure test in borehole method based on above-mentioned experimental rig, includes the following steps:
Step 1: opening water pump and control valve one, control valve two and control valve three are closed, and first order pressure is carried out
Water in water tank is sent into the Rock And Soil crack around borehole test section by the packer permeability test under power, water pump, extra water
It is overflowed from relief valve one；Flow sensor and osmotic pressure sensor store collected data into data collecting instrument；
Step 2: when data on flows reaches the first stage pressure specified in " hydraulic and hydroelectric engineering water pressure test in borehole regulation "
Under ending standard when, closing control valve one, open control valve two, carry out the second stage pressure under packer permeability test；
Step 3: when data on flows reaches the second stage pressure specified in " hydraulic and hydroelectric engineering water pressure test in borehole regulation "
Under ending standard when, closing control valve two, open control valve three, carry out third stage pressure under packer permeability test；
Step 4: when data on flows reaches third stage pressure specified in " hydraulic and hydroelectric engineering water pressure test in borehole regulation "
Under ending standard when, closing control valve three, open control valve two, carry out fourth stage pressure under packer permeability test；
Step 5: when data on flows reaches fourth stage pressure specified in " hydraulic and hydroelectric engineering water pressure test in borehole regulation "
Under ending standard when, closing control valve two, open control valve one, carry out level V pressure under packer permeability test；Work as stream
When amount reaches the ending standard under level V pressure, water pump and data collecting instrument are closed；
Step 6: according to collected data, drawing the change curve of pressure P and flow Q, according to curve feature, determine examination
Then the P-Q curve type of section calculates permeability rate and infiltration coefficient.
Further, the processing step of the borehole test section includes:
Step 1: drilling carries out hole flushing after accomplishing fluently, and returns clearly to aperture water outlet, and when no rock powder is deposited in bottom hole, hole flushing is completed；
Step 2: the core for requiring and drilling in conjunction with water pressure test in borehole chooses borehole test section, by upper rubber water-proof bolt
Plug is respectively placed in the upper and lower side of borehole test section with lower rubber water-proof embolism；
Step 3: opening water injecting pump, the water in water tank is squeezed into upper rubber water-proof embolism, in upper rubber water-proof embolism
Water flow into lower rubber water-proof embolism by connection hose, it is soft to survey pressure for the high pressure between water injecting pump and upper rubber water-proof embolism at this time
Control valve four on pipe is in the open state, and the control valve five that high pressure is surveyed on the branch pipe of pressure hose is in close state, and sees
Examine high pressure survey pressure hose on pressure gauge variation, when pressure gauge show pressure reach predetermined value, simultaneously close off water injecting pump and control
Valve four processed；
Step 4: after water pressure test in borehole, control valve five is slowly opened, by upper rubber water-proof embolism and lower rubber
Pressure slow release inside sealing embolism.
Compared with existing packer permeability test equipment, the good effect of the utility model is as follows: one kind described in the utility model is more
Grade gradient pressure stabilizing water pressure test in borehole device and test method are high by 3 control valves being installed in parallel and 3 relief valves
Effect accurately realizes fields water injection under the 5 grades of gradient pressures required in " hydraulic and hydroelectric engineering water pressure test in borehole regulation "
Process, wherein P1=P5< P2=P4< P3, while the automatic collection and storage of pressure and data on flows are realized, improve work
Efficiency, test data is more accurate reliable, is more in line with code requirement, can be widely used for the survey of hydraulic and hydroelectric engineering ground permeability
The underground engineering fields such as examination, the grouting regulation effect detection of Karst Fissures rock mass and nuclear waste storage addressing.
Detailed description of the invention
Fig. 1 is a kind of structure principle chart of multistage gradient pressure stabilizing water pressure test in borehole device of the utility model.
Fig. 2 is a kind of flow chart of multistage gradient pressure stabilizing water pressure test in borehole method of the utility model.
In figure, 1 water tank；2 water pumps；3 high-pressure hoses；4 check valves；5 pressure stabilizing chambers；6 threeways；7 control valves one；8 controls
Valve two processed；9 control valves three；10 relief valves one；11 relief valves two；12 relief valves three；13 water return pipelines；14 flow sensings
Device；15 osmotic pressure sensors；16DT data collecting instrument；17 water injecting pumps；18 power supply casees；19 control valves four；20 pressure
Table；Sealing embolism on 21；22 lower sealing embolisms；23 connection hoses；24 high pressures survey pressure hose；25 drilling rods；26 drillings；27 rock mass are split
Gap；28 control valves five.
Specific embodiment
Below the technical scheme in the embodiment of the utility model describe clear, perfectly, it is clear that described reality
Applying example only is a part of the embodiment of the utility model, instead of all the embodiments.Based on the embodiments of the present invention,
Those of ordinary skill in the art's every other embodiment obtained, belongs to the protection scope of the utility model.
With reference to the accompanying drawing to a kind of multistage gradient pressure stabilizing water pressure test in borehole device described in the utility model and test
Method is further described in detail:
A kind of multistage gradient pressure stabilizing water pressure test in borehole device described in the utility model and test method, including for water system
System, multistage voltage-stabilizing system, four part of data collection system and bore closed system.
The water system is made of water tank 1, water pump 2, high-pressure hose 3, check valve 4 and drilling rod 25；Water tank 1 is
Packer permeability test provides water source；Water pump 2 can provide the flow of 100L/min under the pressure of 1MPa；Check valve 4 guarantees water flow
One-way flow, in special circumstances guarantee water pump 2 safety.
Multistage voltage-stabilizing system by 5, three threeways 6 of pressure stabilizing chamber, control valve 1, control valve 28, control valve 39,
Relief valve 1, relief valve 2 11, relief valve 3 12 and water return pipeline 13 form；36 arranged in series of threeway；Control valve one
7, control valve 28, control valve 39 are arranged in parallel；Relief valve 1, relief valve 2 11, relief valve 3 12 are arranged in parallel；It returns
13 main function of water lines is that the water flow of relief valve outflow is introduced into water tank 1, is recycled.
Data collection system is made of flow sensor 14, osmotic pressure sensor 15 and DT data collecting instrument 16；Flow
Sensor 14 has the function of monitoring instantaneous flow and integrated flux data in high-pressure hose 3；Osmotic pressure sensor 15 has
Monitor the function of pressure data in high-pressure hose 3；DT data collecting instrument 16 and flow sensor 14 and osmotic pressure sensor 15
It is applied in combination, has the function of acquisition and storing data.
Bore closed system by water injecting pump 17, power supply case 18, control valve 4 19, upper rubber water-proof embolism 21, under
Rubber water-proof embolism 22, high pressure are surveyed pressure hose 24, connection hose 23, control valve 5 28 and pressure gauge 20 and are formed；Connect hose
23 connect upper rubber water-proof embolism 21 and lower rubber water-proof embolism 22；Control valve 4 19 and pressure gauge 20 are series at high pressure and survey pressure
On hose 24, pressure gauge 20 is located at after control valve 4 19；Water is mainly squeezed into upper rubber from water tank 1 and stopped by water injecting pump 17
Inside water embolism 21 and lower rubber water-proof embolism 22.
The pressure stabilizing chamber 5 is made of the pressure-resistant seal tank body of a 20L, above has opening, and upper opening and check valve 4 pass through
High-pressure hose 3 connects, and under shed is connected after the extraction of high-pressure hose 3 with first threeway 6；
The water tank 1 is that water pump 2 and water injecting pump 17 supply water；
Respectively at relief valve 1, relief valve after the control valve 1, control valve 28 are in parallel with control valve 39
2 11 connect with relief valve 3 13；
The water return pipeline 13 drawn by relief valve 1, relief valve 2 11 with relief valve 3 12 and 1 phase of water tank
Connection；
The DT data collecting instrument 16 is applied in combination with flow sensor 14 and osmotic pressure sensor 15, has acquisition simultaneously
The function of storing data, flow sensor 14 are connected with osmotic pressure sensor 15, and are connected to DT data collecting instrument 16；
The control valve 1, control valve 28, control valve 39, control valve 4 19 and control valve 5 28 are equal
For ball valve.
A kind of above-mentioned multistage gradient pressure stabilizing water pressure test in borehole device and test method, the test method include following step
It is rapid:
Step 1: drilling 26 accomplish fluently after by hole flushing, returned to aperture water outlet clear, when no rock powder is deposited in bottom hole, hole flushing is complete
At.
Step 2: it in conjunction with the core of test requirements document and drilling 26, chooses packer permeability test and surveys section, by upper rubber water-proof embolism 21
It is in place with lower rubber water-proof embolism 22.
Step 3: power supply case 18 and water injecting pump 17 are opened, the water in water tank 1 is squeezed into upper rubber water-proof embolism
21, the water in upper rubber water-proof embolism 21 can flow into lower rubber water-proof embolism 22 by connection hose 23, at this time control valve four
19 is in the open state, and control valve 5 28 is in close state.The variation for observing pressure gauge 20, when pressure gauge 20 shows pressure
When reaching predetermined value, generally 2MPa or so, water injecting pump 17 and control valve 4 19 are simultaneously closed off.
Step 4: according to test and code requirement, choosing and install relief valve 1, relief valve 2 11, relief valve 3 12,
Generally 0.3MPa, 0.6MPa, 1MPa or 0.1MPa, 0.3MPa, 0.6MPa can also voluntarily be set according to specific test requirements document
It is fixed.
Step 5: opening DT data collecting instrument, and sensor acquisition parameter, such as acquisition time, frequency acquisition, acquisition is arranged
Precision, stability criterion etc..Water pump 2 and control valve 1 are opened, control valve 28 and control valve 39, which are in, at this time closes
State.The water in water tank 1 will constantly enter in the Rock And Soil crack 27 of drilling 26 being isolated around section at this time, extra
Water will be recycled to inside water tank 1 after the spilling of relief valve 1 by water return pipeline 13.
At this point, flow sensor 14 and osmotic pressure sensor 15 are by collected data, DT data collecting instrument is arrived in storage
It is interior.When data on flows reaches the ending standard under the first stage pressure specified in " hydraulic and hydroelectric engineering water pressure test in borehole regulation "
When, closing control valve 1 opens simultaneously control valve 28, carries out the packer permeability test under the second stage pressure.When flow reaches
When ending standard under the second stage pressure, closing control valve 28 opens simultaneously control valve 39, carries out under third stage pressure
Packer permeability test.When flow reaches the ending standard under third stage pressure, closing control valve 39, while being again turned on control
Valve 28 processed carries out the packer permeability test under fourth stage pressure, when flow reaches the ending standard under fourth stage pressure, closes
Control valve 28 opens simultaneously control valve 1, the packer permeability test under level V pressure is carried out, when flow reaches level V pressure
When ending standard under power, water pump 2 and DT data collecting instrument 16 are closed.
Step 6: control valve 5 28 is slowly opened, inside upper rubber water-proof embolism 21 and lower rubber water-proof embolism 22
Pressure slow release；
Step 7: carrying out next packer permeability test for surveying section, repeat step 1 to step 6.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (4)
1. a kind of multistage gradient pressure stabilizing water pressure test in borehole device, which is characterized in that including what is be sequentially communicated by high-pressure hose
Water tank, water pump, check valve, pressure stabilizing chamber, 3 threeways, drilling rod, borehole test section；3 threeways are separately connected control valve
Men Yi, control valve two and control valve three, control valve one, control valve two and control valve three are separately connected relief valve
One, relief valve two and relief valve three；The high-pressure hose is equipped with flow sensor and osmotic pressure sensor, flow sensor
Data collecting instrument is separately connected with osmotic pressure sensor；The pressure of relief valve one, relief valve two and relief valve three is respectively to bore
First stage pressure, the second stage pressure needed for the packer permeability test of hole and third stage pressure.
2. a kind of multistage gradient pressure stabilizing water pressure test in borehole device according to claim 1, which is characterized in that the pressure release
Valve is connected to the water tank by water return pipeline.
3. a kind of multistage gradient pressure stabilizing water pressure test in borehole device according to claim 1, which is characterized in that the drilling
Rubber water-proof embolism, lower rubber water-proof embolism, upper rubber water-proof embolism, lower rubber water-proof is respectively set in the upper and lower side of test section
Connection hose is connected between embolism；Upper rubber water-proof embolism surveys pressure hose by high pressure and is connected to water injecting pump；The water injecting pump connects
Logical water tank, high pressure survey pressure hose and are equipped with control valve four and pressure gauge, and high pressure surveys pressure hose and is equipped with branch pipe, sets on branch pipe
There is control valve five.
4. a kind of multistage gradient pressure stabilizing water pressure test in borehole device according to claim 1, which is characterized in that the pressure stabilizing
Room includes pressure-resistant seal tank body, and opening is had on pressure-resistant seal tank body, and upper opening and check valve are connected through high-pressure hose, under open
Mouth is connected after high-pressure hose is drawn with the threeway.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920198561.5U CN209485935U (en) | 2019-02-13 | 2019-02-13 | A kind of multistage gradient pressure stabilizing water pressure test in borehole device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920198561.5U CN209485935U (en) | 2019-02-13 | 2019-02-13 | A kind of multistage gradient pressure stabilizing water pressure test in borehole device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682742A (en) * | 2019-02-13 | 2019-04-26 | 华北有色工程勘察院有限公司 | A kind of multistage gradient pressure stabilizing water pressure test in borehole device and test method |
| CN114763742A (en) * | 2022-05-06 | 2022-07-19 | 南京理工大学 | Improved drilling water-pressing test equipment |
| CN120063588A (en) * | 2025-03-12 | 2025-05-30 | 江苏通达船用阀泵有限公司 | Pressure release value intelligent detection equipment with step pressure regulating function for pressure release valve |
-
2019
- 2019-02-13 CN CN201920198561.5U patent/CN209485935U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682742A (en) * | 2019-02-13 | 2019-04-26 | 华北有色工程勘察院有限公司 | A kind of multistage gradient pressure stabilizing water pressure test in borehole device and test method |
| CN114763742A (en) * | 2022-05-06 | 2022-07-19 | 南京理工大学 | Improved drilling water-pressing test equipment |
| CN120063588A (en) * | 2025-03-12 | 2025-05-30 | 江苏通达船用阀泵有限公司 | Pressure release value intelligent detection equipment with step pressure regulating function for pressure release valve |
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Granted publication date: 20191011 Termination date: 20210213 |