CN105351537A - Butterfly valve with two valve clacks - Google Patents
Butterfly valve with two valve clacks Download PDFInfo
- Publication number
- CN105351537A CN105351537A CN201510801833.2A CN201510801833A CN105351537A CN 105351537 A CN105351537 A CN 105351537A CN 201510801833 A CN201510801833 A CN 201510801833A CN 105351537 A CN105351537 A CN 105351537A
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- Prior art keywords
- gear
- valve
- pressure
- clack
- box
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Classifications
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- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/223—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves with a plurality of valve members
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- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
- F16K31/535—Mechanical actuating means with toothed gearing for rotating valves
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- 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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a butterfly valve with two valve clacks. A gearbox is arranged on the upper portion of a valve body. The front valve clack and the rear valve clack are arranged in the valve body. A front valve rod and a rear valve rod penetrate through the front valve clack and the rear valve clack to be fixedly connected with the front valve clack and the rear valve clack respectively. The front valve rod and the rear valve rod rotate to make the front valve clack and the rear valve clack open/close the valve respectively. A gear B and a gear C are fixedly installed on the front valve rod and the rear valve rod respectively. A gear A is arranged between the gear B and the gear C. The gear A can drive the gear B and the gear C to rotate. The gear A, the gear B and the gear C are all installed in the gearbox. The upper portion of a transmission rod penetrates through a turbine shaft hole in a turbine reducer and is fixedly connected with a turbine. By the adoption of the butterfly valve with the multiple valve clacks, the problems that a traditional butterfly valve is poor in sealing performance and is extremely prone to leakage are solved; the butterfly valve can give an alarm automatically, and the pressure of media in the valve can be observed in real time.
Description
Technical field
The present invention relates to valve technology field, particularly a kind of Double-clack butterfly valve.
Background technique
Butterfly valve, as the one of valve, can be used for the flowing controlling all kinds fluids such as air, water, steam, various Korrosionsmedium, mud, oil product, liquid metal and radiating medium.On pipeline, main rising is cut off and throttling action.Butterfly valve open-shut device is a discoidal butterfly plate, rotates in valve body around the axis of himself, thus reaches the object opening and closing or regulate.Butterfly valve has that structure is simple, volume is little, lightweight, material consumption is economized, installation dimension is little, and switch is rapid, 90 ° of reciprocating rotatings, the features such as driving moment is little, for blocking, connecting, regulate the medium in pipeline, there is good fluid handling properties and close sealability
Carry some Korrosionsmediums toxic gas or high-pressure medium time, to the sealing of butterfly valve and reliability requirement just very high, and one of common butterfly valve large shortcoming is exactly sealing reliability difference, after throttle down, the leakage of valve is difficult to be monitored to, pipe-line system makes pipe-line system pressure sharply increase because of blocking or other reasons, if do not give warning in advance, probably brings the problems such as the equipment in pipe bursting, leakage, destruction pipe-line system.
Summary of the invention
For above-mentioned Problems existing, technical purpose of the present invention is to provide a kind of many flaps butterfly valve, solve traditional butterfly valve seal poor, in use very easily there is the problem of leaking, pressure transducer, alarm, display device is provided with in butterfly valve, so just can monitor the working pressure in valve and whether occur leaking after butterfly valve cuts out, to occur in valve that the too high or butterfly valve of working pressure occurs leaking after cutting out, then butterfly valve can automatic alarm, enable staff find out failure cause in time, avoid other production accidents to occur.
The present invention is achieved through the following technical solutions:
A kind of Double-clack butterfly valve, comprise valve body and valve rod, described valve body top is provided with gear-box, front flap and rear flap is provided with in described valve body, described front valve rod and rear valve rod are each passed through front flap and are fixedly connected with rear flap, described front valve rod and rear valve rod rotate and can make front flap and rear flap opening/closing valve respectively, described front valve rod and rear valve rod are installed with gear B and gear C respectively, gear A is provided with between described gear B and gear C, described gear A rotational driven gear B and gear C rotate, described gear A, gear B and gear C are all installed in gear-box, described gear A is installed on drive link bottom, the top of described drive link is passed the turbine axis hole in reducer of turbodrill and is fixedly connected with turbine.
Due to said structure, by being provided with the Double-clack structure of front flap and rear flap in valve body, when making the front flap of butterfly valve occur to leak, rear flap can also to medium-tight in valve, make the reliability of this butterfly valve stronger, its repair cycle also can correspondingly expand; Described gear A, gear B and gear C are all on horizontal plane, and all can only rotate around respective axis, the bottom of drive link is inserted in the axis hole of gear, drive rod rotation driven gear B and the equidirectional rotation of gear C, enable front flap and the synchronous opening/closing of rear flap, and settle at one go; The gear-box installed on the top of butterfly valve is used for gear A, gear B, gear C and transmission part thereof to be installed on gear-box inside, and the mutual transmission of these mechanisms coordinates to come the opening and closing of control valve.
A kind of Double-clack butterfly valve, described gear A, gear B and gear C are straight toothed spur gear, and the material of described gear A, gear B and gear C is structural carbon steel, and the diameter of gear B, gear C equals the diameter of gear A.
Due to said structure, gear A, gear B and gear C being designed to straight toothed spur gear can make the transmission efficiency between gear high, the structure of straight toothed spur gear is simple, material is structural carbon steel, make production cost lower, by 2 times that the diameter design of gear B and gear C is gear A diameter, can make the moment acted on drive link can not be excessive, also make the space shared by gear A, gear B and gear C can not be excessive.
A kind of Double-clack butterfly valve, the bottom surface of described gear-box is the cambered surface of fitting with valve body contact, and in described laminating cambered surface, be provided with positioning strip, described valve outer wall is provided with locating slot, and described gear-box is fixedly connected with valve body screw rod.
Due to said structure, by by the bottom surface of gear-box being the cambered surface of fitting with valve body contact and being provided with positioning strip fitting in cambered surface, valve outer wall is provided with locating slot, positioning strip inserts locating slot and gear-box is located, make the structure of gear-box and valve body outer compact, and gear-box can not be made relative to valve body slides, fixing more firm, gear-box be fixedly connected with valve body screw rod can facilitate gear-box be installed on dismounting.
A kind of Double-clack butterfly valve, described positioning strip is rectangular shape, described positioning strip is positioned at four limits of gear-box, the quantity of described positioning strip is 4, the length of described positioning strip is 0.5 times of the corresponding teeth roller box length of side, the width of described positioning strip is 0.1 times of the corresponding teeth roller box length of side, and the height of described positioning strip is 5mm.
Due to said structure, a positioning strip is provided with by individual on four limits of gear-box, totally four, can in all directions limiting gear case relative to valve body slides, the length of positioning strip, width are respectively 0.5 times, 0.1 times of the corresponding teeth roller box length of side, the height of positioning strip is 5mm, and such length can either prevent the slip of gear-box, does not also need the wall thickness expanding valve body especially.
A kind of Double-clack butterfly valve, described reducer of turbodrill is installed on the top of gear-box, and the power input shaft of described reducer of turbodrill is provided with handle, rotates the rotation that described handle can control drive link.
Due to said structure, reducer of turbodrill is located at the top of gear-box, the length of drive link can be made minimum, the space taken is minimum, and solid and reliable, the handle that the power input shaft on reducer of turbodrill is provided with, can be used for the aperture of regulating valve at any time, reducer of turbodrill butterfly valve is had self-lock ability, enables flap be parked in outer being arbitrarily set up, makes the operating characteristics of valve also better.
A kind of Double-clack butterfly valve, the outside of described butterfly valve is provided with display device and alarm, the ingress of described butterfly valve valve is provided with pressure transducer 1, pressure transducer 2 is provided with between described front flap and rear flap, the pressure signal recorded can be passed to MCU by described pressure transducer 1 and pressure transducer 2, described MCU is by pressure P 1, the numerical value of P2 shows over the display in real time, the pressure P 2 of described MCU to the pressure P 1 at pressure transducer 1 place and pressure transducer 2 place contrasts, if valve is in buttoned-up status, pressure P 2 >=0.5P1, then front flap is poorly sealed, there is leakage, described MCU shows the signal of poorly sealed warning word to display device transmission, described display device shows poorly sealed warning word, described MCU sends alarm signal to alarm, described alarm equipment alarm, if described P1/P2 is greater than the specified pressure-bearing value P of pipe-line system, then described MCU sends alarm signal to alarm, described alarm equipment alarm, and the warning message that display system pressure is excessive over the display.
Due to said structure, by being provided with display device to butterfly valve, alarm, pressure transducer, MCU, butterfly valve is made to be provided with an automatic warning system, by being provided with pressure transducer 1 in the ingress of valve, pressure transducer 2 is provided with between described front flap and rear flap, staff is monitored in real time to valve internal pressure, when butterfly valve cuts out completely, during front flap sealing No leakage, the pressure of medium acts on front flap completely, the pressure at pressure transducer 2 place is very little, the pressure data P1 that MCU passes back according to pressure transducer, P2, use formula P2 >=0.3P1, if set up, then butterfly valve has leakage, now MCU sends the warning of signal triggered alarm, the printed words of display medium leakage over the display simultaneously, when service conduits, if poisonous medium, seldom all very large threat can be caused to the safety of the staff of downstream maintenance as long as reveal, if butterfly valve is when opening/closing, the pressure at pressure transducer 1 or pressure transducer 2 place is higher than the specified pressure-bearing value P of pipe-line system, so certainly, now there are equipment or pipe network to occur problem, after MCU receives pressure signal, triggered alarm is reported to the police, over the display by warning reason display simultaneously, make staff have sufficient time to judge where occurred problem, and solve a problem promptly.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, Double-clack butterfly valve of the present invention, by being provided with two flaps in valve body, i.e. front flap and rear flap, when one of them flap has leakage, another flap can also play a role, and the butterfly valve of such Double-clack can make the better effects if of sealing, seals more reliable.
2, Double-clack butterfly valve of the present invention, by being provided with gear drive between reducer of turbodrill and butterfly valve flap, staff is passed through ON/OFF that a handle of regulating wheel retarder just can regulate two flaps simultaneously, and make the operating process of Double-clack butterfly valve identical with the operating process of single butterfly valve.
3, Double-clack butterfly valve of the present invention, by the entrance at valve and be provided with pressure transducer between front flap and rear flap, and outside valve, be provided with display device and alarm, make staff can observe the pressure of medium in valve at any time, if occur, the situation of overpressure can also send warning automatically; After valve closing, reveal if front flap exists, alarm automatically gives the alarm and by the display of alarm reason over the display, so just makes Double-clack butterfly valve apply safer aborning, break down and can give warning in advance.
Accompanying drawing explanation
Fig. 1 is the structural representation of Double-clack butterfly valve of the present invention;
Mark in figure: 1 be valve body, 2 be front flap, 3 be rear flap, 4 be front valve rod, 5 be rear valve rod, 6 be gear, 7 be drive link, 8 be gear-box, 9 be reducer of turbodrill, 10 for handle.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
1, as shown in Figure 1, Double-clack butterfly valve of the present invention, comprises valve body 1, front flap 2, rear flap 3, front valve rod 4, rear valve rod 5, gear 6, drive link 7, gear-box 8, reducer of turbodrill 9, handle 10, it is characterized in that: described valve body 1 top is provided with gear-box 8, front flap 2 and rear flap 3 is provided with in described valve body 1, described front valve rod 4 and rear valve rod 5 are each passed through front flap 2 and are fixedly connected with rear flap 3, described front valve rod 4 and rear valve rod 5 rotate and can make front flap 2 and rear flap 3 opening/closing valve respectively, described front valve rod 4, rear valve rod 5, drive link 7 is all installed with gear 6, between the gear 6 of gear 6 on described drive link 7 on front valve rod 4 and the gear 6 on rear valve rod 5, gear 6 rotational on described drive link 7 drives the gear 6 on front valve rod 4 and the gear 6 on rear valve rod 5 to rotate, described front valve rod 4, rear valve rod 5, gear 6 on drive link 7 is all installed in gear-box (8), and the gear 6 on described drive link 7 is installed on the bottom of drive link 7, and the top of described drive link 7 is passed the turbine axis hole in reducer of turbodrill 9 and is fixedly connected with turbine, described gear 6 is straight toothed spur gear, the material of described gear 6 is structural carbon steel, also the better material such as 20Cr, 20CrMo can be selected as required, in order to control gear case size and can easy manipulation handle 10, the gear 6 be installed in lever 7 equals the diameter of the gear 6 on front valve rod 4 and the gear 6 on rear valve rod 5, the bottom surface of described gear-box 8 is the cambered surface of fitting with valve body contact, in described laminating cambered surface, be provided with positioning strip, and described valve body 1 outer wall is provided with locating slot, and described gear-box 8 is fixedly connected with screw rod with valve body 1, described positioning strip is rectangular shape, described positioning strip is positioned at four limits of gear-box 8, and the quantity of described positioning strip is 4, and the length of described positioning strip is 0.5 times of corresponding teeth roller box 8 length of side, the width of described positioning strip is 0.1 times of corresponding teeth roller box 8 length of side, and the height of described positioning strip is 5mm, described reducer of turbodrill 9 is installed on the top of gear-box 8, and the power input shaft of described reducer of turbodrill 9 is provided with handle 10, rotates the rotation that described handle 10 can control drive link 7, the outside of described butterfly valve is provided with display device and alarm, the ingress of described butterfly valve valve is provided with pressure transducer 1, pressure transducer 2 is provided with between described front flap 2 and rear flap 3, the pressure signal recorded can be passed to MCU by described pressure transducer 1 and pressure transducer 2, described MCU is by pressure P 1, the numerical value of P2 shows over the display in real time, the pressure P 2 of described MCU to the pressure P 1 at pressure transducer 1 place and pressure transducer 2 place contrasts, if valve is in buttoned-up status, pressure P 2 >=0.3P1, then front flap 2 is poorly sealed, there is leakage, described MCU shows the signal of poorly sealed warning word to display device transmission, described display device shows poorly sealed warning word, described MCU sends alarm signal to alarm, described alarm equipment alarm, if described P1/P2 is greater than the specified pressure-bearing value P of pipe-line system, then described MCU sends alarm signal to alarm, described alarm equipment alarm, and the excessive warning message of display system pressure over the display.
Double-clack butterfly valve of the present invention, is realized by following steps:
1, Double-clack butterfly valve is arranged on pipeline, after pipeline is connected with medium, just the pressure in pipeline is can be observed by display device, when needs throttle down, just rotatable handles 10, pass torque to drive link 7 by reducer of turbodrill 9, closedown moment is passed to front valve rod 4 and rear valve rod 5 by gear 6 by described drive link 7, and front valve rod 4 and rear valve rod 5 drive front flap 2 and rear flap 3 to rotate with throttle down respectively;
2, after valve closing, pressure transducer 1 and pressure transducer 2 by the pressure signal transmission that measures to MCU, the pressure recorded is respectively P1, P2, if pressure P 2 >=0.3P1, then there is leakage in valve, and front flap 2 is poorly sealed, MCU shows the signal of poorly sealed warning word to display device transmission, described display device shows poorly sealed warning word, and described MCU sends alarm signal to alarm, described alarm equipment alarm; If described P1 or P2 is greater than the specified pressure-bearing value P of pipe-line system, then described MCU sends alarm signal to alarm, described alarm equipment alarm, and the excessive warning message of display system pressure over the display, to notify the reason that personnel systems goes wrong.
When valve needs to open, handle with sleeve 10, makes front flap 2 and rear flap 3 rotate by reducer of turbodrill 9, drive link 7, gear 6, front valve rod 4 and rear valve rod 5, butterfly valve is opened; In valve open state, if butterfly valve is in open mode, pipe-line system internal pressure sharply increases, when exceeding the specified pressure-bearing value P of system, pressure transducer 1 or pressure transducer 2 by the pressure signal transmission recorded to MCU, MCU receive the pressure signal P 1/P2 recorded be greater than P value time, MCU sends alarm signal to alarm, alert device is reported to the police, and measured pressure value P 1 and P2 is shown over the display, and the excessive warning word of display system pressure.
Claims (6)
1. a Double-clack butterfly valve, comprise valve body (1) and valve rod (4), it is characterized in that: described valve body (1) top is provided with gear-box (8), front flap (2) and rear flap (3) is provided with in described valve body (1), described front valve rod (4) and rear valve rod (5) are each passed through front flap (2) and are fixedly connected with rear flap (3), described front valve rod (4) and rear valve rod (5) rotate and can make front flap (2) and rear flap (3) opening/closing valve respectively, described front valve rod (4) and rear valve rod (5) are installed with gear B and gear C respectively, gear A is provided with between described gear B and gear C, described gear A rotational driven gear B and gear C rotate, described gear A, gear B and gear C are all installed in gear-box (8), described gear A is installed on the bottom of drive link (7), the top of described drive link (7) is passed the turbine axis hole in reducer of turbodrill (9) and is fixedly connected with turbine.
2. Double-clack butterfly valve according to claim 1, is characterized in that, described gear A, gear B and gear C are straight toothed spur gear, and the material of described gear A, gear B and gear C is structural carbon steel, and the diameter of gear B, gear C equals the diameter of gear A.
3. Double-clack butterfly valve according to claim 2, it is characterized in that, the bottom surface of described gear-box (8) is the cambered surface of fitting with valve body contact, positioning strip is provided with in described laminating cambered surface, described valve body (1) outer wall is provided with locating slot, and described gear-box (8) is fixedly connected with screw rod with valve body (1).
4. Double-clack butterfly valve according to claim 3, it is characterized in that, described positioning strip is rectangular shape, described positioning strip is positioned at four limits of gear-box (8), the quantity of described positioning strip is 4, the length of described positioning strip is 0.5 times of corresponding teeth roller box (8) length of side, and the width of described positioning strip is 0.1 times of corresponding teeth roller box (8) length of side, and the height of described positioning strip is 5mm.
5. Double-clack butterfly valve according to claim 4, it is characterized in that, described reducer of turbodrill (9) is installed on the top of gear-box (8), the power input shaft of described reducer of turbodrill (9) is provided with handle (10), rotates the rotation that described handle (10) can control drive link (7).
6. Double-clack butterfly valve according to claim 5, it is characterized in that, the outside of described butterfly valve is provided with display device and alarm, the ingress of described butterfly valve valve is provided with pressure transducer 1, pressure transducer 2 is provided with between described front flap (2) and rear flap (3), the pressure signal recorded can be passed to MCU by described pressure transducer 1 and pressure transducer 2, described MCU is by pressure P 1, the numerical value of P2 shows over the display in real time, the pressure P 2 of described MCU to the pressure P 1 at pressure transducer 1 place and pressure transducer 2 place contrasts, if valve is in buttoned-up status, pressure P 2 >=0.3P1, then front flap (2) is poorly sealed, there is leakage, described MCU shows the signal of poorly sealed warning word to display device transmission, described display device shows poorly sealed warning word, described MCU sends alarm signal to alarm, described alarm equipment alarm, if described P1/P2 is greater than the specified pressure-bearing value P of pipe-line system, then described MCU sends alarm signal to alarm, described alarm equipment alarm, and the excessive warning message of display system pressure over the display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510801833.2A CN105351537A (en) | 2015-11-19 | 2015-11-19 | Butterfly valve with two valve clacks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510801833.2A CN105351537A (en) | 2015-11-19 | 2015-11-19 | Butterfly valve with two valve clacks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105351537A true CN105351537A (en) | 2016-02-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510801833.2A Pending CN105351537A (en) | 2015-11-19 | 2015-11-19 | Butterfly valve with two valve clacks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105351537A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606254A (en) * | 2017-10-25 | 2018-01-19 | 杭州老板电器股份有限公司 | Check-valves and central cooking fume control equipment |
| CN110525982A (en) * | 2019-09-20 | 2019-12-03 | 中冶长天国际工程有限责任公司 | The air leak test method and ash discharging system of Double-deck cinder discharge valve |
| CN110671503A (en) * | 2019-09-18 | 2020-01-10 | 中国电建集团山东电力建设第一工程有限公司 | Leakage-proof butterfly valve |
| CN110686165A (en) * | 2019-10-15 | 2020-01-14 | 西南石油大学 | Intelligent natural gas pipeline corrosion monitoring device |
| CN111609151A (en) * | 2020-05-12 | 2020-09-01 | 青岛正宇机电制造有限公司 | Bidirectional non-return plastic valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107606254A (en) * | 2017-10-25 | 2018-01-19 | 杭州老板电器股份有限公司 | Check-valves and central cooking fume control equipment |
| CN107606254B (en) * | 2017-10-25 | 2024-04-12 | 杭州老板电器股份有限公司 | Check valve and central oil smoke clarification plant |
| CN110671503A (en) * | 2019-09-18 | 2020-01-10 | 中国电建集团山东电力建设第一工程有限公司 | Leakage-proof butterfly valve |
| CN110525982A (en) * | 2019-09-20 | 2019-12-03 | 中冶长天国际工程有限责任公司 | The air leak test method and ash discharging system of Double-deck cinder discharge valve |
| CN110686165A (en) * | 2019-10-15 | 2020-01-14 | 西南石油大学 | Intelligent natural gas pipeline corrosion monitoring device |
| CN111609151A (en) * | 2020-05-12 | 2020-09-01 | 青岛正宇机电制造有限公司 | Bidirectional non-return plastic valve |
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Application publication date: 20160224 |