CN107191784A - A kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system - Google Patents
A kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system Download PDFInfo
- Publication number
- CN107191784A CN107191784A CN201710524800.7A CN201710524800A CN107191784A CN 107191784 A CN107191784 A CN 107191784A CN 201710524800 A CN201710524800 A CN 201710524800A CN 107191784 A CN107191784 A CN 107191784A
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- Prior art keywords
- valve
- meltable
- stop valve
- combustion gas
- protection system
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/40—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint
- F16K17/403—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint with a fracturing valve member
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The present invention relates to a kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system; meltable valve is additionally provided with the pressure guiding pipe at the rear of stop valve; the A ends of meltable valve are connected with main gas circuit; B ends are connected with stop valve, and C-terminal is connected with extraneous air, when generation fire or temperature are drastically raised; metallics fusing in meltable valve; gas discharge in the BC ports conducting of meltable valve, stop valve diaphragm chamber to meltable valve, stop valve is cut off due to under-voltage；Or, meltable valve is additionally provided with the pressure guiding pipe at the rear of stop valve, the B ends of the meltable valve are connected with main gas circuit, and A ends are connected with stop valve, C-terminal is connected with the inlet ductwork of pressure regulator, under fire condition, when environment temperature reaches meltable valve design temperature, the metallics fusing in meltable valve, the BC ports conducting of meltable valve, stop valve diaphragm chamber is connected with inlet pressure, is cut off due to superpressure, and reliability is also further improved.
Description
Technical field
The present invention relates to a kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system, belong to combustion gas fire-proof protection skill
Art field.
Background technology
In gas application, widely, surge tank is generally located on roadside or city for surge tank, pressure regulating box application
Public place near the cell of town, pressure regulating box is generally located in town region on skin.Surrounding environment is as prominent in occurred
Fire incident is sent out, Gas Pressure Regulating Equipment failure is may result in, pressure regulation and safety means failure etc. is mainly shown as, it is existing at present
The less research all kinds of gas pressure regulating facilities under fire hazard environment of technology avoid fire when occurring caused supply accident taken
Correlation technique measure.How in fire, surge tank, the security performance of pressure regulating box are improved, is the technology that this area is badly in need of solving
Problem.
The content of the invention
The purpose of the present invention is, by the way that the various components in surge tank are designed with transformation, to improve surge tank, pressure regulation
The fire safety performance of case, eliminates safe hidden trouble.
A kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system, it is characterised in that：Including pressure regulator 3, stop valve
3.1st, latching device L；Diaphragm in the Stress control head B of the stop valve 3.1 is connected with push rod D, push rod D bottoms and guide cylinder
Connection, the push rod D and guide cylinder are arranged within closing housing, and the closing lower housing portion is provided with accommodating and spacing first bullet
Spring E structure, the first spring E is fixedly connected with guide cylinder；Second spring F, second spring F are set inside the guide cylinder
Upper end is connected with push rod D, and lower end is connected with guide cylinder bottom；The push rod D is promoted up or down, can drive opening to latch
Mechanism L, makes stop valve 3.1 implement cutoff action；Meltable valve 3.2, institute are additionally provided with the pressure guiding pipe at the rear of the stop valve 3.1
The A ends for stating meltable valve 3.2 are connected with main gas circuit, and B ends are connected with stop valve 3.1, and C-terminal is connected with extraneous air, occur fire or
When temperature is drastically raised, the metallics fusing in meltable valve, the BC ports conducting of meltable valve, stop valve diaphragm chamber to meltable valve
Interior gas discharge, stop valve is cut off due to under-voltage.
A kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system, including pressure regulator 3, stop valve 3.1, latching device
L；Diaphragm in the Stress control head B of the stop valve 3.1 is connected with push rod D, and push rod D bottoms are connected with guide cylinder, described to push away
Bar D and guide cylinder are arranged within closing housing, structure of the closing lower housing portion provided with accommodating and spacing first spring E,
The first spring E is fixedly connected with guide cylinder；Meltable valve 3.2 is additionally provided with the pressure guiding pipe at the rear of stop valve 3.1, it is described easy
The B ends of molten valve 3.2 are connected with main gas circuit, and A ends are connected with stop valve 3.1, and C-terminal is connected with the inlet ductwork of pressure regulator 3.
Further, second spring F is set inside the guide cylinder, and second spring F upper ends are connected with push rod D, lower end and
Guide cylinder bottom is connected；The push rod D is promoted up or down, can be driven opening latching device L, be implemented stop valve 3.1
Cutoff action；
Further, the fusing point of the material of the diaphragm in the Stress control head B is molten much larger than the diaphragm in pressure regulator 3
Point.
Further, the material of the diaphragm in the Stress control head B is the film in metal material, the pressure regulator 3
Piece is quality of rubber materials.
Further, the C-terminal is connected by pressure regulation ball valve 3.3 with the inlet ductwork of pressure regulator 3.
Further, being set respectively with rearmost end foremost for system is protected in the meltable valve assist type combustion gas fire-proof pressure regulation
There are import block valve 1 and outlet block valve 6.
Further, import first pressure table 2 and regulating valve 2.1 are provided between the import block valve 1 and pressure regulator 3；
Second pressure table 4 and regulating valve 2.1 are provided between the outlet block valve 6 and pressure regulator 3.
Further, debugging ball valve 5 is set between the second pressure table 4 and outlet block valve 6.
Further, the push rod D is promoted up or down, and push rod D bands moving cam H is rotated clockwise or counterclockwise, convex
Take turns H drives latching device L to open by follow-up transmission mechanism.
The beneficial effects of the present invention are：
1) inside of stop valve is ingenious to be provided with second spring E in addition to the first conventional spring F, so that cutting
Disconnected valve 3.1 both can be with excess pressure cutout, again can be with undervoltage, and two kinds of cutting functions are mutually independent of each other, and improve stop valve
Reliability, the reply abnormal condition such as fire on this basis, sets meltable valve, the A ends of meltable valve are connected with main gas circuit, B
End is connected with stop valve, and C-terminal is connected with extraneous air, under normal circumstances, and fire occurs for A, B end connection, stop valve normal work
Or environment temperature is when drastically raising, the metallics fusing in meltable valve, the BC ports conducting of meltable valve, stop valve diaphragm chamber is extremely
Gas is discharged in meltable valve, and quick action emergency valve is cut off due to under-voltage, forms dual fail-safe, and reliability is further improved, and forms double
Insure (scheme one).
2) pressure guiding pipe at the rear of stop valve 3.1 is provided with meltable valve 3.2, and B ends and the main gas circuit of the meltable valve 3.2 connect
Connect, A ends are connected with stop valve 3.1, C-terminal is connected with the inlet ductwork of pressure regulator 3, under Normal Environmental Temperature, the AB of meltable valve
Port is turned on, and quick action emergency valve works by normal mode；Under fire condition, when environment temperature reaches meltable valve design temperature,
Metallics fusing in meltable valve, the BC ports conducting of meltable valve, stop valve diaphragm chamber is connected with inlet pressure, due to superpressure
And cut off, reliability is also further improved.(scheme two).
3) diaphragm in stop valve 3.1 uses metallic membrane, and fusing point is far above the rubber diaphragm in pressure regulator, due to metal
The fusing point of diaphragm is substantially higher in rubber diaphragm, therefore under fire condition, pressure regulator diaphragm must be prior to emergency cut-off valve film
Breakage, now, pressure regulator outlet pressure are increased to after quick action emergency valve setting pressure, and quick action emergency valve energy excess pressure cutout enters one
Step improves reliability (as preferably).
Brief description of the drawings
Fig. 1 is the meltable valve assist type combustion gas fire-proof pressure regulation protection system schematic of prior art.
Fig. 2 is the scheme schematic diagram that system embodiment one is protected in meltable valve assist type combustion gas fire-proof pressure regulation of the invention.
Fig. 3 is the scheme schematic diagram that system embodiment two is protected in meltable valve assist type combustion gas fire-proof pressure regulation of the invention.
During Fig. 4 is embodiment one, in meltable valve assist type combustion gas fire-proof pressure regulation protection system, the structural representation of stop valve
Figure.
In figure, 1. import block valves, 2. inlet pressure gauges, 3. pressure regulators, 3.1 --- stop valve, 3. meltable valve MTV, 4.
Delivery gauge, 5. debugging ball valves, 6. outlet block valves, A. flaps, B. Stress control heads, C. manual reset mechanisms, D. push rods,
E. the first spring, F. second springs, the springs of G. the 3rd, L. latching devices.
Embodiment
The present invention is further described with specific embodiment below in conjunction with the accompanying drawings.
Embodiment one：
Referring to Fig. 2 and 4, a kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system, it is characterised in that：Including pressure regulation
Device 3, stop valve 3.1, latching device L；Diaphragm in the Stress control head B of the stop valve 3.1 is connected with push rod D, under push rod D
Portion is connected with guide cylinder, and the push rod D and guide cylinder are arranged within closing housing, and the closing lower housing portion, which is provided with, to be housed simultaneously
Spacing first spring E structure, the first spring E is fixedly connected with guide cylinder；Second spring is set inside the guide cylinder
F, second spring F upper ends are connected with push rod D, and lower end is connected with guide cylinder bottom；The push rod D is promoted up or down, equal energy
Drive and open latching device L, stop valve 3.1 is implemented cutoff action；It is additionally provided with the pressure guiding pipe at the rear of the stop valve 3.1
Meltable valve 3.2, the A ends of the meltable valve 3.2 are connected with main gas circuit, and B ends are connected with stop valve 3.1, and C-terminal connects with extraneous air
It is logical, when generation fire or temperature are drastically raised, the metallics fusing in meltable valve, the BC ports conducting of meltable valve, stop valve
Gas is discharged in diaphragm chamber to meltable valve, and stop valve is cut off due to under-voltage.
Fusing point of the fusing point of the material of diaphragm in the Stress control head B much larger than the diaphragm in pressure regulator 3.
The material of diaphragm in the Stress control head B is that the diaphragm in metal material, the pressure regulator 3 is rubber material
Matter.
Referring to Fig. 2, being set respectively with rearmost end foremost for system is protected in the meltable valve assist type combustion gas fire-proof pressure regulation
There are import block valve 1 and outlet block valve 6.
Referring to Fig. 2, import first pressure table 2 and regulating valve 2.1 are provided between the import block valve 1 and pressure regulator 3；Institute
State and second pressure table 4 and regulating valve 2.1 are provided between outlet block valve 6 and pressure regulator 3.
Referring to Fig. 2, debugging ball valve 5 is set between the second pressure table 4 and outlet block valve 6.
Referring to Fig. 4, the push rod D is promoted up or down, and push rod D bands moving cam H is rotated clockwise or counterclockwise, cam
H drives latching device L to open by follow-up transmission mechanism.
During specific experiment, the quick action emergency valve with superpressure and undervoltage function is installed on test dress as shown in Figure 4
Put, pressure regulator is set as that 2kPa, quick action emergency valve are set as 4kPa (superpressure) and 1.1kPa (under-voltage).
Step A：Ventilated 0.1MPa to test device at from 1 import block valve, open test valve 5, and with flame gun pair
Pressure regulator diaphragm chamber flame for a period of time after, find delivery gauge 4 show pressure suddenly rise after be reduced to zero, while promptly cutting
Disconnected valve has been turned off；Pressure regulator diaphragm chamber is opened, it is found that pressure regulator diaphragm is damaged.
Step B：Change pressure regulator diaphragm after, again to test device ventilate 0.1MPa, open test valve 5, and with spray
Firelock to quick action emergency valve diaphragm chamber flame for a period of time after, find delivery gauge 4 show pressure decrease up to zero suddenly, together
When quick action emergency valve have been turned off；Quick action emergency valve diaphragm chamber is opened, it is found that emergency cut-off valve film is damaged.
At the same time, meltable valve is placed in high-low temperature chamber, its 3 interfaces (A, B and C) are respectively connecting to shown in Fig. 2
In test device, and pressure regulator is set as that 2kPa, quick action emergency valve are set as 4kPa (superpressure) and 1.1kPa (under-voltage), it is meltable
Valve design temperature is 130 DEG C.To test device ventilation 0.1MPa at from 1 import block valve, test valve 5 is opened, by high/low temperature
Case progressively heats up, when temperature reaches 132 DEG C, and C mouthfuls have gas discharge, delivery gauge 4 to be reduced to the cut-out of zero, quick action emergency valve.
It is repeated 3 times, temperature when stop valve is cut off is respectively 125 DEG C, 131 DEG C and 136 DEG C.Double guarantors are formed with above-mentioned steps A and step B
Danger.
Embodiment two：
Referring to Fig. 3 and 4, meltable valve 3.2, the meltable valve 3.2 are additionally provided with the pressure guiding pipe at the rear of the stop valve 3.1
B ends be connected with main gas circuit, A ends are connected with stop valve 3.1, and C-terminal is connected with the inlet ductwork of pressure regulator 3.
Under Normal Environmental Temperature, the AB ports conducting of meltable valve, quick action emergency valve works by normal mode；
Under fire condition, when environment temperature reaches meltable valve design temperature (100 DEG C, 130 DEG C or 160 DEG C), meltable valve
Interior metallics fusing, the BC ports conducting of meltable valve, stop valve diaphragm chamber is connected with inlet pressure, cut due to superpressure
It is disconnected.
During specific implementation：
Meltable valve is placed in high-low temperature chamber, its 3 interfaces (A, B and C) are respectively connecting to the test device shown in Fig. 3
On, and pressure regulator is set as that 4kPa, quick action emergency valve are set as 3kPa (superpressure) and 1.1kPa (under-voltage), meltable valve setting temperature
Spend for 130 DEG C.
To test device ventilation 0.1MPa at from 1 import block valve, test valve 5 is opened, high-low temperature chamber is progressively heated up,
When temperature reaches 128 DEG C, quick action emergency valve cut-out, delivery gauge 4 are reduced to zero.It is repeated 3 times, temperature when stop valve is cut off
Respectively 135 DEG C, 126 DEG C and 132 DEG C.
Claims (10)
1. a kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system, it is characterised in that：
Including pressure regulator (3), stop valve (3.1), latching device (L)；
Diaphragm in the Stress control head (B) of the stop valve (3.1) is connected with push rod (D), and push rod (D) bottom connects with guide cylinder
Connect, the push rod (D) and guide cylinder are arranged within closing housing, and the closing lower housing portion is provided with accommodating and spacing first bullet
The structure of spring (E), first spring (E) is fixedly connected with guide cylinder；
Second spring (F) is set, and second spring (F) upper end is connected with push rod (D), lower end and guide cylinder bottom inside the guide cylinder
Portion is connected；
The push rod (D) promotes up or down, can drive opening latching device (L), stop valve (3.1) is implemented cut-out dynamic
Make；
Meltable valve (3.2), the A ends of the meltable valve (3.2) and master are additionally provided with the pressure guiding pipe at the rear of the stop valve (3.1)
Gas circuit is connected, and B ends are connected with stop valve (3.1), and C-terminal is connected with extraneous air, meltable when generation fire or temperature are drastically raised
Metallics fusing in valve, the BC ports conducting of meltable valve, gas discharge in stop valve diaphragm chamber to meltable valve, stop valve by
In under-voltage and cut off.
2. a kind of meltable valve assist type combustion gas fire-proof pressure regulation protection system, it is characterised in that：
Including pressure regulator (3), stop valve (3.1), latching device (L)；
Diaphragm in the Stress control head (B) of the stop valve (3.1) is connected with push rod (D), and push rod (D) bottom connects with guide cylinder
Connect, the push rod (D) and guide cylinder are arranged within closing housing, and the closing lower housing portion is provided with accommodating and spacing first bullet
The structure of spring (E), first spring (E) is fixedly connected with guide cylinder；
Meltable valve (3.2), B ends and the main gas circuit of the meltable valve (3.2) are additionally provided with the pressure guiding pipe at the rear of stop valve (3.1)
Connection, A ends are connected with stop valve (3.1), and C-terminal is connected with the inlet ductwork of pressure regulator (3).
3. meltable valve assist type combustion gas fire-proof pressure regulation protection system as claimed in claim 2, it is characterised in that：
Second spring (F) is set, and second spring (F) upper end is connected with push rod (D), lower end and guide cylinder bottom inside the guide cylinder
Portion is connected；
The push rod (D) promotes up or down, can drive opening latching device (L), stop valve (3.1) is implemented cut-out dynamic
Make.
4. meltable valve assist type combustion gas fire-proof pressure regulation protection system as claimed in claim 1 or 2, it is characterised in that：It is described
Fusing point of the fusing point of the material of diaphragm in Stress control head (B) much larger than the diaphragm in pressure regulator (3).
5. meltable valve assist type combustion gas fire-proof pressure regulation protection system as claimed in claim 4, it is characterised in that：The pressure
The material for controlling the diaphragm in head (B) is that the diaphragm in metal material, the pressure regulator (3) is quality of rubber materials.
6. meltable valve assist type combustion gas fire-proof pressure regulation protection system as claimed in claim 2, it is characterised in that：The C-terminal
Connected by pressure regulation ball valve (3.3) with the inlet ductwork of pressure regulator (3).
7. meltable valve assist type combustion gas fire-proof pressure regulation protection system as claimed in claim 1 or 2, it is characterised in that：It is described
Meltable valve assist type combustion gas fire-proof pressure regulation protection system is respectively equipped with import block valve (1) and outlet with rearmost end foremost
Block valve (6).
8. meltable valve assist type combustion gas fire-proof pressure regulation protection system as claimed in claim 1 or 2, it is characterised in that：It is described
Import first pressure table (2) and regulating valve (2.1) are provided between import block valve (1) and pressure regulator (3)；The outlet block valve
(6) second pressure table (4) and regulating valve (2.1) are provided between pressure regulator (3).
9. meltable valve assist type combustion gas fire-proof pressure regulation protection system as claimed in claim 8, it is characterised in that：Described second
Debugging ball valve (5) is set between pressure gauge (4) and outlet block valve (6).
10. meltable valve assist type combustion gas fire-proof pressure regulation protection system as claimed in claim 1, it is characterised in that：It is described to push away
Bar (D) is promoted up or down, and push rod (D) band moving cam (H) is rotated clockwise or counterclockwise, and cam (H) is by being subsequently driven
Mechanism drives latching device (L) to open.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710524800.7A CN107191784B (en) | 2017-06-30 | 2017-06-30 | Auxiliary gas fire hazard prevention pressure regulating protection system for fusible valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710524800.7A CN107191784B (en) | 2017-06-30 | 2017-06-30 | Auxiliary gas fire hazard prevention pressure regulating protection system for fusible valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107191784A true CN107191784A (en) | 2017-09-22 |
| CN107191784B CN107191784B (en) | 2023-03-21 |
Family
ID=59881268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710524800.7A Active CN107191784B (en) | 2017-06-30 | 2017-06-30 | Auxiliary gas fire hazard prevention pressure regulating protection system for fusible valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107191784B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237982A (en) * | 2017-07-03 | 2017-10-10 | 上海飞奥燃气设备有限公司 | One kind is super, undervoltage formula combustion gas fire-proof pressure-adjusting protection device |
| CN111750163A (en) * | 2020-07-15 | 2020-10-09 | 浙江挺宇流体设备股份有限公司 | Emergency cut-off pneumatic control system |
Citations (3)
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|---|---|---|---|---|
| CN201487554U (en) * | 2009-08-11 | 2010-05-26 | 河北慧星调压器有限公司 | Cutting-off pressure-regulating integrated gas pressure regulator |
| DE102009034805A1 (en) * | 2009-07-25 | 2011-01-27 | Schaeffler Technologies Gmbh & Co. Kg | Switchable valve train |
| CN202140637U (en) * | 2011-07-08 | 2012-02-08 | 谷红军 | Fuel gas cut off valve |
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2017
- 2017-06-30 CN CN201710524800.7A patent/CN107191784B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009034805A1 (en) * | 2009-07-25 | 2011-01-27 | Schaeffler Technologies Gmbh & Co. Kg | Switchable valve train |
| CN201487554U (en) * | 2009-08-11 | 2010-05-26 | 河北慧星调压器有限公司 | Cutting-off pressure-regulating integrated gas pressure regulator |
| CN202140637U (en) * | 2011-07-08 | 2012-02-08 | 谷红军 | Fuel gas cut off valve |
Non-Patent Citations (1)
| Title |
|---|
| 降涛;: "谈燃气锅炉房燃烧器安全管理" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237982A (en) * | 2017-07-03 | 2017-10-10 | 上海飞奥燃气设备有限公司 | One kind is super, undervoltage formula combustion gas fire-proof pressure-adjusting protection device |
| CN111750163A (en) * | 2020-07-15 | 2020-10-09 | 浙江挺宇流体设备股份有限公司 | Emergency cut-off pneumatic control system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107191784B (en) | 2023-03-21 |
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Inventor after: Xi Dan Inventor after: Tang Qian Inventor after: Li Shenghua Inventor after: Pan Liang Inventor after: Ruan Ming Inventor after: Yang Yueshan Inventor after: Shi Hanlong Inventor after: Qiao Tao Inventor before: Xi Dan Inventor before: Tang Qian Inventor before: Li Shenghua Inventor before: Pan Liang Inventor before: Ruan Ming Inventor before: Yang Yueshan Inventor before: Shi Hanlong |
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Effective date of registration: 20180514 Address after: No. 4493 Longdong Road, Pudong New Area, Shanghai Applicant after: SHANGHAI FIORENTINI GAS EQUIPMENT Co.,Ltd. Applicant after: HONG KONG AND CHINA GAS INVESTMENT LTD. Applicant after: Hong Kong China Gas Investment Co.,Ltd. Address before: No. 4493 Longdong Road, Pudong New Area, Shanghai Applicant before: SHANGHAI FIORENTINI GAS EQUIPMENT Co.,Ltd. Applicant before: HONG KONG AND CHINA GAS INVESTMENT LTD. |
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