CN109488807A - A kind of double release type ball valves of forged steel easy to use - Google Patents
A kind of double release type ball valves of forged steel easy to use Download PDFInfo
- Publication number
- CN109488807A CN109488807A CN201811647449.1A CN201811647449A CN109488807A CN 109488807 A CN109488807 A CN 109488807A CN 201811647449 A CN201811647449 A CN 201811647449A CN 109488807 A CN109488807 A CN 109488807A
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- valve
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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
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/06—Devices for relieving the pressure on the sealing faces for taps or cocks
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
Abstract
The invention discloses a kind of double release type ball valves of forged steel easy to use, including end valve body, middle valve body, sphere, lower valve pipe spreader, lower valve shaft, bottom cover, first O-ring, soket head cap screw, first sliding axle is held, lengthen sleeve, first flat key, upper valve shaft, second O-ring, second sliding axle is held, upper central siphon set, airtight and watertight padding, packing press ring, first terminal pad, first grease pouring valve, second terminal pad, studs, first hex nut, extension bar connector sleeve, lengthen rod bush, extension bar, diffusion valve extension pipe, floating ball valve, shut-off valve, diffusion valve connecting tube, grease pouring valve pipe, second grease pouring valve, turbine terminal pad, second flat key, turbine-driven set, connecting stud, second hex nut, flange gasket, anti-static device, bleeder valve, blowdown valve, valve seat support ring, valve seat insert, compressed spring, Third O-ring and the 4th O-ring, the equipment is easy to use, and structure is simple, easy for installation.
Description
Technical field
The present invention relates to diffusion valve technical field, the double release type ball valves of specially a kind of forged steel easy to use.
Background technique
Diffusion valve is a kind of safety early warning device of pipeline gas, when the air pressure in pipeline is more than setting atmospheric pressure value
When, that is, the valve of a certain amount of gas is discharged, is an indispensable equipment in pipeline gas transmission, traditional diffusion valve is needing to open
Open defeated deflation pressure when, because diffusion valve valve ball in off position when, there is pressure difference on ball both sides, and input end has pressure, and outlet end does not have
Pressure, valve opening difficulty increases in this case, and therefore, designing a kind of double release type ball valves of forged steel easy to use is to have very much
It is necessary.
Summary of the invention
The purpose of the present invention is to provide a kind of double release type ball valves of forged steel easy to use, to solve above-mentioned background technique
The problem of middle proposition.
In order to solve the above technical problem, the present invention provides following technical solutions: a kind of double releases of forged steel easy to use
Type ball valve, including end valve body, middle valve body, sphere, lower valve pipe spreader, lower valve shaft, bottom cover, the first O-ring, soket head cap screw,
One sliding bearing, lengthen sleeve, the first flat key, upper valve shaft, the second O-ring, second sliding axle are held, upper central siphon set, airtight and watertight padding,
Packing press ring, the first terminal pad, the first grease pouring valve, the second terminal pad, studs, the first hex nut, extension bar connector sleeve,
Lengthen rod bush, extension bar, diffusion valve extension pipe, floating ball valve, shut-off valve, diffusion valve connecting tube, grease pouring valve pipe, the second greasing
Valve, turbine terminal pad, the second flat key, turbine-driven set, connecting stud, the second hex nut, flange gasket, antistatic dress
It sets, bleeder valve, blowdown valve, valve seat support ring, valve seat insert, compressed spring, third O-ring and the 4th O-ring, the middle valve
Body two sides are installed by welding with end valve body, and the middle valve body bottom end center is logical to be installed by welding with lower valve pipe spreader, the lower valve axle sleeve
It is inlayed between pipe and bottom cover and the first O-ring is installed, the bottom cover top is placed with lower valve shaft, the lower valve shaft top welding peace
It is held equipped with first sliding axle, the first sliding axle is held to inlay and is mounted in sphere, and end valve body two sides, which are installed by welding with, to be added
Long sleeve, the end valve inner are provided with sphere, and the sphere bottom end is equipped with blowdown valve, the sphere top by screw
Bleeder valve is installed by screw, end valve interior wall both ends are placed with valve seat support ring, the valve seat support ring and sphere
Between inlay valve seat insert be installed, inlayed between the valve seat support ring and end valve body and compressed spring be installed, the valve
Seat supports circle bottom end side, which is inlayed, is equipped with third O-ring, and the valve seat support ring bottom end other side inlays that be equipped with the 4th O-shaped
Circle, the sphere top are equipped with upper valve shaft by the first flat key, and the middle top end of the valve body, which is inlayed, is equipped with central siphon set, described
Upper valve shaft side by adjust the second O-ring is installed, the upper valve shaft top is installed by welding with second sliding axle and holds, it is described on
Central siphon set top is installed by welding with the first terminal pad, and first terminal pad two sides are equipped with the second connection by studs
Disk, first terminal pad are connected and fixed with the second terminal pad by the first hex nut, and the second sliding axle holds top two
Side is filled with airtight and watertight padding, and the airtight and watertight padding top is placed with packing press ring, and the second sliding axle holds mobile terminal and passes through set
It connects and packing press ring is installed, the second sliding axle holds one end and is equipped with the first grease pouring valve, second terminal pad by screw
Top passes through socket on the outside of the extension bar and is equipped with lengthening rod bush, the lengthening by being installed by welding with lengthening rod bush
Bar bottom end is installed by welding with extension bar connector sleeve, and extension bar connector sleeve bottom end is held with second sliding axle by welding and connect,
Extension bar connector sleeve top is installed by welding with turbine terminal pad, and turbine terminal pad top is equipped with turbine by screw
Driving device, extension bar top side connect diffusion valve extension pipe top with turbine-driven set by the second flat key
Floating ball valve is installed by connecting stud and the second hex nut, the floating ball valve top passes through connecting stud and the two or six
Angle nut is equipped with shut-off valve, inlays between the floating ball valve and shut-off valve and is equipped with flange gasket, the shut-off valve top
Connecting stud and the second hex nut are equipped with diffusion valve connecting tube, and the lengthening rod bush side both ends are fixedly installed with greasing
Valve pipe, grease pouring valve tube top end, which is inlayed, is equipped with the second grease pouring valve, inlays and is equipped between the upper valve shaft and upper central siphon set
Anti-static device is inlayed between the upper valve shaft and sphere and is equipped with anti-static device.
Further, the lower valve shaft casing shoe is equipped with bottom cover by soket head cap screw.
Further, the second sliding axle holds outside and is equipped with central siphon set by socket.
Further, the lengthening sleeve top two sides are installed by welding with diffusion valve extension pipe.
Further, it is inlayed between the floating ball valve and diffusion valve extension pipe and flange gasket is installed.
Compared with prior art, the beneficial effects obtained by the present invention are as follows being: by by the floating of diffusion valve extension pipe two sides
Ball valve and shut-off valve are fully open, make importEndIt is transported to outlet end by diffusion valve extension pipe, keeps the pressure of sphere two sides flat
Weighing apparatus, can easily open sphere.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the enlarged drawing of A of the invention；
Fig. 3 is the enlarged drawing of B of the invention；
In figure: 1, end valve body；2, middle valve body；3, sphere；4, lower valve pipe spreader；5, lower valve shaft；6, bottom cover；7, the first O-ring；8,
Soket head cap screw；9, first sliding axle is held；10, sleeve is lengthened；11, the first flat key；12, upper valve shaft；13, the second O-ring；14,
Second sliding axle is held；15, upper central siphon set；16, airtight and watertight padding；17, packing press ring；18, the first terminal pad；19, the first grease pouring valve；
20, the second terminal pad；21, studs；22, the first hex nut；23, extension bar connector sleeve；24, rod bush is lengthened；25, add
Stock；26, diffusion valve extension pipe；27, floating ball valve；28, shut-off valve；29, diffusion valve connecting tube；30, grease pouring valve pipe；31,
Two grease pouring valves；32, turbine terminal pad；33, the second flat key；34, turbine-driven set；35, connecting stud；36, the second hexagonal spiral shell
It is female；37, flange gasket；38, anti-static device；39, bleeder valve；40, blowdown valve；41, valve seat support ring；42, valve seat insert；
43, compressed spring；44, third O-ring；45, the 4th O-ring.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-3 is please referred to, the present invention provides a kind of technical solution: a kind of double release type ball valves of forged steel easy to use, packet
Include end valve body 1, middle valve body 2, sphere 3, lower valve pipe spreader 4, lower valve shaft 5, bottom cover 6, the first O-ring 7, soket head cap screw 8, first
Sliding bearing 9, lengthening sleeve 10, the first flat key 11, upper valve shaft 12, the second O-ring 13, second sliding axle hold 14, upper central siphon set
15, airtight and watertight padding 16, packing press ring 17, the first terminal pad 18, the first grease pouring valve 19, the second terminal pad 20, studs 21,
One hex nut 22, extension bar connector sleeve 23, lengthen rod bush 24, extension bar 25, diffusion valve extension pipe 26, floating ball valve 27,
Shut-off valve 28, diffusion valve connecting tube 29, grease pouring valve pipe 30, the second grease pouring valve 31, turbine terminal pad 32, the second flat key 33, turbine
Driving device 34, connecting stud 35, the second hex nut 36, flange gasket 37, anti-static device 38, bleeder valve 39, blowdown valve
40, valve seat support ring 41, valve seat insert 42, compressed spring 43, third O-ring 44 and the 4th O-ring 45, middle 2 two sides of valve body
It is installed by welding with end valve body 1, middle 2 bottom end center of valve body is logical to be installed by welding with lower valve pipe spreader 4, and 4 bottom end of lower valve pipe spreader passes through
Soket head cap screw 8 is equipped with bottom cover 6, inlays between lower valve pipe spreader 4 and bottom cover 6 and is equipped with the first O-ring 7, and 6 top of bottom cover is put
It is equipped with lower valve shaft 5,5 top of lower valve shaft is installed by welding with first sliding axle and holds 9, and first sliding axle, which is held 9 and inlayed, is mounted on sphere 3
Interior, 1 two sides of end valve body, which are installed by welding with, lengthens sleeve 10, and end valve body 1 is internally provided with sphere 3, and 3 bottom end of sphere is pacified by screw
Equipped with blowdown valve 40,3 top of sphere is equipped with bleeder valve 39 by screw, and 1 inner wall both ends of end valve body are placed with valve seat support ring
41, it is inlayed between valve seat support ring 41 and sphere 3 and valve seat insert 42 is installed, inlayed between valve seat support ring 41 and end valve body 1
Embedding to be equipped with compressed spring 43,41 bottom end side of valve seat support ring, which is inlayed, is equipped with third O-ring 44,41 bottom end of valve seat support ring
The other side, which is inlayed, is equipped with the 4th O-ring 45, and 3 top of sphere is equipped with valve shaft 12, middle 2 top of valve body by the first flat key 11
It inlays and central siphon set 15 is installed, upper 12 side of valve shaft is equipped with the second O-ring 13 by adjusting, upper 12 top of valve shaft welding peace
14 are held equipped with second sliding axle, second sliding axle holds 14 outsides and is equipped with central siphon set 15 by socket, and upper central siphon covers 15 tops
It is installed by welding with the first terminal pad 18,18 two sides of the first terminal pad are equipped with the second terminal pad 20 by studs 21, and first
Terminal pad 18 is connected and fixed with the second terminal pad 20 by the first hex nut 22, and second sliding axle is held 14 top two sides and is filled with
Airtight and watertight padding 16,16 top of airtight and watertight padding are placed with packing press ring 17, and second sliding axle is held 14 mobile terminals and is equipped with by socket
Packing press ring 17, second sliding axle hold 14 one end and are equipped with the first grease pouring valve 19 by screw, and 20 top of the second terminal pad passes through
It is installed by welding with and lengthens rod bush 24, be equipped on the outside of extension bar 25 by socket and lengthen rod bush 24, the weldering of 25 bottom end of extension bar
It connects and extension bar connector sleeve 23 is installed, 14 connections, extension bar are held with second sliding axle by welding in 23 bottom end of extension bar connector sleeve
23 top of connector sleeve is installed by welding with turbine terminal pad 32, and 32 top of turbine terminal pad is equipped with turbine-driven set by screw
34,25 top side of extension bar is connect by the second flat key 33 with turbine-driven set 34, lengthens the welding of 10 top two sides of sleeve
Diffusion valve extension pipe 26 is installed, 26 top of diffusion valve extension pipe is equipped with by connecting stud 35 with the second hex nut 36 floating
Dynamic ball valve 27, inlays between floating ball valve 27 and diffusion valve extension pipe 26 and is equipped with flange gasket 37, and 27 top of floating ball valve is logical
It crosses connecting stud 35 and the second hex nut 36 is equipped with shut-off valve 28, inlay and be equipped between floating ball valve 27 and shut-off valve 28
Flange gasket 37,28 top connecting stud 35 of shut-off valve and the second hex nut 36 are equipped with diffusion valve connecting tube 29, extension bar
24 side both ends of casing are fixedly installed with grease pouring valve pipe 30, and 30 top of grease pouring valve pipe, which is inlayed, is equipped with the second grease pouring valve 31, upper valve
Inlay anti-static device 38 be installed between axis 12 and upper central siphon set 15, inlayed between upper valve shaft 12 and sphere 3 be equipped with prevent it is quiet
Electric installation 38；In use, making import by the way that the floating ball valve 27 of 26 two sides of diffusion valve extension pipe and shut-off valve 28 is fully open
End is transported to outlet by diffusion valve extension pipe 26, makes the pressure balance of 3 two sides of sphere, is driven and is added by turbine-driven set 34
Stock 25 makes extension bar connector sleeve 23 that second sliding axle be driven to hold 14, and valve shaft 12 is made to drive sphere 3, opens sphere 3, simultaneously
When pressure rise in pipeline, or pressure release is needed, it, can will as long as just removing floating ball valve 27 and shut-off valve 28 any one
Pressure is released in 3 both sides pipeline of sphere, and there are also let out which side pressure just removes which side valve also if necessary.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (5)
1. a kind of double release type ball valves of forged steel easy to use, including end valve body (1), middle valve body (2), sphere (3), lower valve axle sleeve
Pipe (4), lower valve shaft (5), bottom cover (6), the first O-ring (7), soket head cap screw (8), first sliding axle hold (9), lengthen sleeve
(10), the first flat key (11), upper valve shaft (12), the second O-ring (13), second sliding axle hold (14), upper central siphon set (15), sealing
Filler (16), packing press ring (17), the first terminal pad (18), the first grease pouring valve (19), the second terminal pad (20), studs
(21), the first hex nut (22), extension bar connector sleeve (23), lengthening rod bush (24), extension bar (25), diffusion valve extension pipe
(26), floating ball valve (27), shut-off valve (28), diffusion valve connecting tube (29), grease pouring valve pipe (30), the second grease pouring valve (31), whirlpool
Take turns terminal pad (32), the second flat key (33), turbine-driven set (34), connecting stud (35), the second hex nut (36), flange
Gasket (37), anti-static device (38), bleeder valve (39), blowdown valve (40), valve seat support ring (41), valve seat insert (42),
Compressed spring (43), third O-ring (44) and the 4th O-ring (45), it is characterised in that: middle valve body (2) the two sides welding peace
Equipped with end valve body (1), middle valve body (2) the bottom end center is logical to be installed by welding with lower valve pipe spreader (4), the lower valve pipe spreader
(4) it inlays and is equipped with the first O-ring (7) between bottom cover (6), bottom cover (6) top is placed with lower valve shaft (5), under described
Valve shaft (5) top is installed by welding with first sliding axle and holds (9), and the first sliding axle, which is held (9) and inlayed, to be mounted in sphere (3),
End valve body (1) two sides, which are installed by welding with, lengthens sleeve (10), and the end valve body (1) is internally provided with sphere (3), the ball
Body (3) bottom end is equipped with blowdown valve (40) by screw, and sphere (3) top is equipped with bleeder valve (39), institute by screw
It states end valve body (1) inner wall both ends to be placed with valve seat support ring (41), inlays peace between the valve seat support ring (41) and sphere (3)
Equipped with valve seat insert (42), is inlayed between the valve seat support ring (41) and end valve body (1) and compressed spring (43), institute are installed
It states valve seat support ring (41) bottom end side and inlays and be equipped with third O-ring (44), valve seat support ring (41) the bottom end other side
It inlays and the 4th O-ring (45) is installed, sphere (3) top is equipped with valve shaft (12) by the first flat key (11), described
Middle valve body (2) top, which is inlayed, to be equipped with central siphon set (15), and upper valve shaft (12) side is equipped with the second O-ring by adjusting
(13), upper valve shaft (12) top is installed by welding with second sliding axle and holds (14), upper central siphon set (15) the top welding peace
Equipped with the first terminal pad (18), the first terminal pad (18) two sides are equipped with the second terminal pad by studs (21)
(20), first terminal pad (18) is connected and fixed with the second terminal pad (20) by the first hex nut (22), and described second
Sliding bearing (14) top two sides are filled with airtight and watertight padding (16), and airtight and watertight padding (16) top is placed with packing press ring
(17), the second sliding axle holds (14) mobile terminal and is equipped with packing press ring (17) by socket, and the second sliding axle is held
(14) one end is equipped with the first grease pouring valve (19) by screw, and the second terminal pad (20) top is by being installed by welding with lengthening
Rod bush (24), extension bar (25) outside is equipped with by socket lengthens rod bush (24), extension bar (25) bottom end
It is installed by welding with extension bar connector sleeve (23), (14) are held with second sliding axle by welding in extension bar connector sleeve (23) bottom end
Connection, extension bar connector sleeve (23) top are installed by welding with turbine terminal pad (32), turbine terminal pad (32) top
It is equipped with turbine-driven set (34) by screw, extension bar (25) the top side is driven by the second flat key (33) and turbine
Dynamic device (34) connect diffusion valve extension pipe (26) top and are installed by connecting stud (35) and the second hex nut (36)
Have floating ball valve (27), floating ball valve (27) top is equipped with by connecting stud (35) and the second hex nut (36) and is cut
Only valve (28) inlay between the floating ball valve (27) and shut-off valve (28) and are equipped with flange gasket (37), the shut-off valve
(28) top connecting stud (35) and the second hex nut (36) are equipped with diffusion valve connecting tube (29), the lengthening rod bush
(24) side both ends are fixedly installed with grease pouring valve pipe (30), and grease pouring valve pipe (30) top, which is inlayed, is equipped with the second grease pouring valve
(31), it inlays and is equipped with anti-static device (38) between the upper valve shaft (12) and upper central siphon set (15), the upper valve shaft (12)
It is inlayed between sphere (3) and anti-static device (38) is installed.
2. a kind of double release type ball valves of forged steel easy to use according to claim 1, it is characterised in that: the lower valve shaft
Casing (4) bottom end is equipped with bottom cover (6) by soket head cap screw (8).
3. a kind of double release type ball valves of forged steel easy to use according to claim 1, it is characterised in that: described second is sliding
Central siphon set (15) are equipped with by socket on the outside of dynamic bearing (14).
4. a kind of double release type ball valves of forged steel easy to use according to claim 1, it is characterised in that: the lengthening sleeve
Pipe (10) top two sides are installed by welding with diffusion valve extension pipe (26).
5. a kind of double release type ball valves of forged steel easy to use according to claim 1, it is characterised in that: the float ball
It is inlayed between valve (27) and diffusion valve extension pipe (26) and flange gasket (37) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811647449.1A CN109488807A (en) | 2018-12-29 | 2018-12-29 | A kind of double release type ball valves of forged steel easy to use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811647449.1A CN109488807A (en) | 2018-12-29 | 2018-12-29 | A kind of double release type ball valves of forged steel easy to use |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109488807A true CN109488807A (en) | 2019-03-19 |
Family
ID=65713560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811647449.1A Pending CN109488807A (en) | 2018-12-29 | 2018-12-29 | A kind of double release type ball valves of forged steel easy to use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109488807A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797865A (en) * | 2012-07-26 | 2012-11-28 | 北京京燃凌云燃气设备有限公司 | Polyethylene (PE) double-diffusing ball valve |
| CN202612770U (en) * | 2012-05-18 | 2012-12-19 | 株洲新奥燃气有限公司 | Connecting pipe for opening ball valve with double blow off mouths |
| CN202719177U (en) * | 2012-08-02 | 2013-02-06 | 苏州工业园区思达德阀门有限公司 | Double-blocking and double-bleeding ball valve |
| CN105114652A (en) * | 2015-09-13 | 2015-12-02 | 苏州市燃气设备阀门制造有限公司 | Steel-plastics ball valve structure |
| CN206874892U (en) * | 2017-04-12 | 2018-01-12 | 良工阀门集团有限公司 | A kind of special full welding double-diffusing ball valve of natural gas |
| CN207278923U (en) * | 2017-10-19 | 2018-04-27 | 唐工阀门集团有限公司 | A kind of double adapters of band lengthen welds buried fuel gas ball valve entirely |
-
2018
- 2018-12-29 CN CN201811647449.1A patent/CN109488807A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202612770U (en) * | 2012-05-18 | 2012-12-19 | 株洲新奥燃气有限公司 | Connecting pipe for opening ball valve with double blow off mouths |
| CN102797865A (en) * | 2012-07-26 | 2012-11-28 | 北京京燃凌云燃气设备有限公司 | Polyethylene (PE) double-diffusing ball valve |
| CN202719177U (en) * | 2012-08-02 | 2013-02-06 | 苏州工业园区思达德阀门有限公司 | Double-blocking and double-bleeding ball valve |
| CN105114652A (en) * | 2015-09-13 | 2015-12-02 | 苏州市燃气设备阀门制造有限公司 | Steel-plastics ball valve structure |
| CN206874892U (en) * | 2017-04-12 | 2018-01-12 | 良工阀门集团有限公司 | A kind of special full welding double-diffusing ball valve of natural gas |
| CN207278923U (en) * | 2017-10-19 | 2018-04-27 | 唐工阀门集团有限公司 | A kind of double adapters of band lengthen welds buried fuel gas ball valve entirely |
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Application publication date: 20190319 |