CN103322211A - Metal sealed butterfly valve without pin connection - Google Patents
Metal sealed butterfly valve without pin connection Download PDFInfo
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- CN103322211A CN103322211A CN2013102546275A CN201310254627A CN103322211A CN 103322211 A CN103322211 A CN 103322211A CN 2013102546275 A CN2013102546275 A CN 2013102546275A CN 201310254627 A CN201310254627 A CN 201310254627A CN 103322211 A CN103322211 A CN 103322211A
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Abstract
The invention discloses a metal sealed butterfly valve without pin connection. The metal sealed butterfly valve comprises a back bearing block component, hold-down bolts and nuts, packing, a valve body, a valve stem, a valve plate, a packing bushing, a packing gland and a front bearing block component. Packing holes are formed in two ends of the valve body and filled with the packing, the packing is squeezed by the packing bushing and the packing gland, and the packing bushing and the packing gland are fixed on the valve body through the hold-down bolts and nuts. The back bearing block component and the front bearing block component are respectively arranged at two ends of the valve body, the valve stem is positioned and driven by bearings in the back bearing block component and the front bearing block component, and the valve plate is connected with the valve stem through a spline structure. The metal sealed butterfly valve without pin connection has the advantages that possibility of loosening of the inside of the valve or falling-off of parts inside the valve is avoided, friction between the valve stem and a shaft bush is eliminated since the bearings are moved to the outside of the valve body, 'zero friction' during start and stop processes of the valve is guaranteed by the three-eccentric valve plate and the U-shaped valve seat structure, and accordingly the metal sealed butterfly valve is adaptable to places having requirements for quick cutoff.
Description
[technical field]
The present invention relates to does not have the technical field that pin connects metallic sealing butterfly valve, and being specially adapted to medium is the technical field of control butterfly valve in the inflammable and explosive pipe-line system.
[background technique]
Characteristics such as that butterfly valve has is simple in structure, cost is low are extensively applied to every field such as oil, chemical industry, Coal Chemical Industry, light industry.In the existing reed valve, the fixing taper pin that adopts usually between its inner valve rod and valve plate connects, and for preventing that pin comes off in the valve using process, often adopting the spot welding mode is that pin is fixed, and makes valve difficult in dismounting or maintenance process; Moreover the mode of spot welding is also insecure, and chance High Temperature High Pressure or stress deformation meeting pin occurs and come off.Be under the inflammable and explosive special operation condition (as hydrogen) at some media, require the valve internal structure that loosening or caducous component can not be arranged, to prevent that valve from becoming flexible or caducous component come off and valve body or inner-walls of duct generation bump generation spark in running, blast.Simultaneously, these special operation conditions require valve to realize interlocking action fast when fault.In the smaller occasion of some pipe diameters, generally select ball valve to realize control.When pipe diameter was big, the cost of ball valve was high more a lot of than the butterfly valve of same size.
Problems such as present butterfly valve structure adopts pin to connect, and valve internal easily becomes flexible, the component that easily come off, and there is friction phenomenon at valve inner in bearing between valve rod and the axle sleeve, and valve global existence sealing is relatively poor, working life is short, safety reliability is relatively poor.
[summary of the invention]
Purpose of the present invention solves the problems of the prior art exactly, propose a kind of no pin and connect metallic sealing butterfly valve, can eliminate the friction phenomenon that exists between valve rod and the axle sleeve, solve easily loosening and caducous problem of valve internal component, promote safety reliability, increase the service life.
For achieving the above object, the present invention proposes a kind of no pin and connect metallic sealing butterfly valve, comprise the rear bearing block assembly, follower bolt and nut, filler, valve body, valve rod, valve plate, the filler gland, hold-down grid, the front-end bearing pedestal assembly, two ends of valve body has stuffing hole, be provided with filler in the stuffing hole, described filler is pushed by filler gland and hold-down grid, filler gland and hold-down grid adopt follower bolt and nut to be fixed on the valve body, described rear bearing block assembly and front-end bearing pedestal assembly are placed on two ends of valve body respectively, described valve rod positions and transmission by the bearing in rear bearing block assembly and the front-end bearing pedestal assembly, valve rod adopts integral structure, and valve plate connects with valve rod by spline structure.
As preferably, be provided with valve seat between described valve plate and the valve body, described valve seat is the U-shaped valve seat, and the empennage of valve seat is bumped into by hexagon socket head cap screw and is fixed in the valve seat trim ring of valve outlet side, seat design is floating type, has the function at automatic adjustment center under the effect of valve plate.
As preferably, described valve plate is three eccentric structures, makes sealing surface ovalize conical structure.
As preferably, also comprise the filler spacer ring, described filler is separated to form double-layer seal by the filler spacer ring.
As preferably, also comprise pretightening butterfly spring, between described follower bolt and nut and the hold-down grid pretightening butterfly spring is set.
As preferably, also comprise stop collar, described stop collar is installed in the stuffing hole of valve body, and the cylindrical of stop collar and valve body are transition fit, prevent that stop collar from rotating.
As preferably, there is the adjusting play between the front-end face of described stop collar and the valve plate; There is the gap between described stop collar and the valve rod, prevents that stop collar and valve rod from rubbing.
As preferably, described front-end bearing pedestal assembly comprises front-end bearing pedestal, preceding deep groove ball bearing, gland screw, preceding gland, described front-end bearing pedestal and valve body are fixedly connected, deep groove ball bearing is built in the front-end bearing pedestal before described, the outer ring of preceding deep groove ball bearing is by preceding gland location, front step on the described valve rod is by the inner ring location of preceding deep groove ball bearing, and preceding gland is fixedly connected by gland screw and front-end bearing pedestal; The rear bearing block assembly comprises gland screw, rear pressing cover, back deep groove ball bearing, adjusts spacer, rear bearing block, described rear bearing block and valve body are fixedly connected, back deep groove ball bearing is built in the rear bearing block, locate by rear pressing cover the outer ring of back deep groove ball bearing, rear pressing cover is fixedly connected by gland screw and rear bearing block, is provided with the adjustment spacer between the inner ring of back deep groove ball bearing and the backward step of valve rod.
As preferably, be provided with anti-static device between described valve body and the valve plate, described anti-static device is made up of cylindrical spring and steel ball.
Beneficial effect of the present invention: the butterfly valve of the present invention by adopting no pin to connect, avoided valve internal to have the possibility of loosening or the component that easily come off, and bearing moved to the valve body outside, eliminated the friction phenomenon that exists between valve rod and the axle sleeve, guaranteed valve " zero friction " in opening-closing process, the valve rod integral structure has guaranteed the form and position tolerance of valve, and anti-static device has been eliminated mutual fricative electrostatic phenomenon between valve components.Make valve have good airproof performance, long service life, safe and reliable characteristics.Can be widely used in fields such as oil, chemical industry, Coal Chemical Industry, light industry, be specially adapted to medium and be the process control in the inflammable and explosive pipe-line system, and can be applicable to the fast shut-off occasion.
Feature of the present invention and advantage will be elaborated by reference to the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is a kind of structural representation that does not have pin connection metallic sealing butterfly valve of the present invention;
Fig. 2 is a kind of structural representation that does not have the front-end bearing pedestal assembly in the pin connection metallic sealing butterfly valve of the present invention;
Fig. 3 is a kind of structural representation that does not have the rear bearing block assembly in the pin connection metallic sealing butterfly valve of the present invention;
Fig. 4 is a kind of schematic representation that does not have sealing configuration in the pin connection metallic sealing butterfly valve of the present invention.
Among the figure: 1-rear bearing block assembly, 2-follower bolt and nut, the 3-pretightening butterfly spring, the 4-filler, 5-filler spacer ring, the 6-valve body, the 7-stop collar, the 8-anti-static device, the 9-valve rod, the 10-valve plate, 11-filler gland, the 12-hold-down grid, 13-front-end bearing pedestal assembly, the 14-front-end bearing pedestal, deep groove ball bearing before the 15-, the 16-gland screw, gland before the 17-, the 18-rear pressing cover, deep groove ball bearing behind the 19-, 20-adjusts spacer, the 21-rear bearing block, the 22-valve seat, the 23-seal ring, the 24-socket head screw, 25-valve seat trim ring, the 26-gasket seal.
[embodiment]
Consult Fig. 1, the present invention does not have the pin metallic sealing butterfly valve, comprise rear bearing block assembly 1, follower bolt and nut 2, pretightening butterfly spring 3, filler 4, filler spacer ring 5, valve body 6, stop collar 7, anti-static device 8, valve rod 9, valve plate 10, filler gland 11, hold-down grid 12, front-end bearing pedestal assembly 13, described rear bearing block assembly 1 and front-end bearing pedestal assembly 13 are placed on valve body 6 stuffing hole two ends respectively, be fixedly connected by screw and locating stud and valve body, described valve rod 9 positions and transmission by the bearing in rear bearing block assembly 1 and the front-end bearing pedestal assembly 13, greatly reduce the frictional force of valve, reduced the keying moment of valve.Described valve body 6 is cast inblock or forging type, described filler 4 is installed in the stuffing hole of valve body 6, described filler 4 is separated to form double-layer seal by filler spacer ring 5, guarantee the pre-tightness of filler simultaneously, described filler 4 carries out pretension by adjusting follower bolt and nut 2, pushed by filler gland 11 and hold-down grid 12, realize the sealing of filler 4,12 of described follower bolt and nut 2 and hold-down grids also are provided with pretightening butterfly spring 3, when the trace wearing and tearing appear in filler in the valve using process 4, pretightening butterfly spring 3 can be realized from the pretension function, increase valve working life, described stop collar 7 is installed in the valve body 6 afterbody stuffing holes, be positioned on the valve body 6 by afterbody, cylindrical and the valve body 6 of stop collar 7 are transition fit simultaneously, prevent that stop collar 7 from rotating, there are certain slight clearance in 10 of the front-end face of stop collar 7 and valve plates, be used for preventing that axial displacement from use appearring in valve plate 10, there are certain interval in 9 of described stop collar 7 and valve rods, prevent from occurring between stop collar 7 and the valve rod 9 phenomenon of phase mutual friction, described valve rod 9 is integral structure, by rear bearing parts 1 and fore bearing parts 13 location, guaranteed the form and position tolerance of valve, the intensity of valve rod 9 satisfies the design pressure requirement simultaneously, and and valve body 6 and valve plate 10 between be provided with anti-static device 8, make maintenance good electrical conductivity all the time between valve body 6 and the valve plate 10, eliminated valve components because mutual fricative electrostatic phenomenon, adopt splined between described valve rod 9 and the valve plate 10, pin easily comes off and produces the phenomenon of spark when having avoided traditional butterfly valve plate to adopt pin to connect, and makes whole valve cavity not have any easily loosening or component of coming off.
Be splined between valve body 6 and the valve rod 9, make valve internal not have any loosening component, pin easily comes off and produces the phenomenon of spark when having avoided original employing pin to connect.Valve plate 10 is designed to three eccentric structures, and making sealing surface is the oval cone of a uniqueness.The whole pile-up welding hard alloy of sealing surface has improved sealing surface hardness, strengthens performances such as wear-resisting, corrosion-resistant.Valve plate 10 is producing under the effect of eccentric angle under the axial force, and during valve closing, the active force of valve plate 10 makes U-shaped valve seat 22 that deformation take place, and until both tight connectings, forms the linear sealing of metal to metal; When opening, valve plate 10 sealing surfaces can realize hightailing the valve seat 22 of U-shaped, form " zero friction ", increase valve working life.Greatly reduce the wearing and tearing of frictional resistance and sealing surfaces, reduced valve opening moment, prolonged valve working life, effectively avoided simultaneously because the electrostatic phenomenon that sliding friction produces.
Consult Fig. 2, front-end bearing pedestal assembly 13 of the present invention, comprise front-end bearing pedestal 14, preceding deep groove ball bearing 15, gland screw 16, preceding gland 17, described front-end bearing pedestal 14 is fixedly connected by screw and locating stud and valve body 6, deep groove ball bearing 15 is built in the front-end bearing pedestal 14 before described, the outer ring of preceding deep groove ball bearing 15 is by preceding gland 17 location, front step on the described valve rod 9 is by the inner ring location of preceding deep groove ball bearing 15, prevent that effectively valve rod 9 from flying out, simultaneously be provided with the anti-static device mounting hole at valve rod 9, described anti-static device 8 is made up of cylindrical spring and steel ball, make between valve plate 10 and the valve body 6 and remain good electrical conductivity, eliminated valve components because mutual fricative electrostatic phenomenon.Gland 17 is fixedly connected by gland screw 16 and front-end bearing pedestal 14 before described.Deep groove ball bearing 15 adopts the deep groove ball bearing (contact-type) of two sides band seal ring before described, makes the interior steel ball of bearing be effectively protected, and has the characteristics of long service life.
Consult Fig. 3, rear bearing block assembly 1 of the present invention, comprise gland screw 16, rear pressing cover 18, back deep groove ball bearing 19, adjust spacer 20, rear bearing block 21, described rear bearing block 21 is fixedly connected by screw and locating stud and valve body 6, described back deep groove ball bearing 19 is built in the rear bearing block 21, the outer ring of back deep groove ball bearing 19 is by rear pressing cover 18 location, and described rear pressing cover 18 is fixedly connected by gland screw 16 and rear bearing block 21.Be provided with between the inner ring of described back deep groove ball bearing 19 and the backward step of valve rod 9 and adjust spacer 20, the size by this adjustment spacer 20 of suitable adjustment makes valve plate 10 be positioned at the valve central position, the usability of assurance valve.The described back deep groove ball bearing 19 same deep groove ball bearings (contact-type) that adopt the two sides band seal ring, steel ball is effectively protected in the bearing that makes, and has the characteristics of long service life.
Front-end bearing pedestal 14 and rear bearing block 21 are separately positioned on the two ends of valve body 6, be fixedly connected by screw and locating stud and valve body 6, deep groove ball bearing 15 and back deep groove ball bearing 19 before being respectively equipped with in front-end bearing pedestal 14 and the rear bearing block 21, replaced original phenomenon that axle sleeve is set at valve inner, eliminated the friction of 9 of axle sleeve and valve rods, back deep groove ball bearing 19 and 9 of valve rods are provided with and adjust spacer 20 simultaneously, be provided with stop collar 7 at the valve front end, guaranteed that effectively valve plate 10 is all the time in the valve central position, reduced the frictional force of valve rod 9 simultaneously, reduce valve opening and closing moment, improved working life.Deep groove ball bearing 15 and back deep groove ball bearing 19 adopt the deep groove ball bearing of two sides band contact seal circle before described, prevent that rainwater or dust from entering long service life.
Consult Fig. 4, sealed member of the present invention, comprise valve plate 10, valve seat 22, seal ring 23, socket head screw 24, valve seat trim ring 25, gasket seal 26, described valve plate 10 is three eccentric structures, its sealing surface is by the special oval cone that is processed into a uniqueness, and the equal pile-up welding hard alloy of whole sealing surface makes valve plate 10 sealing surfaces have characteristics such as wear-resisting, corrosion-resistant.All valve seats 22 place on the valve body 6, position by valve seat trim ring 25, valve seat 22 adopts " U " type metal ring structure, sealing surface is circular arc line, valve seat 22 empennages place on the valve body 6 on one side, and another side is near valve seat trim ring 25, and and 25 of valve seat trim rings be provided with gasket seal 26, described valve seat trim ring 25 is fixed on the valve body 6 by socket head screw 24, and and 6 of valve bodies be provided with seal ring 23.By seal ring 23 and gasket seal 26, can be good at guaranteeing the sealing of valve seat 22 afterbodys.U-shaped valve seat 22 adopts Martensitic Stain Less Steel or the INCONEL alloy of better mechanical property, has better rebound elasticity.Valve seat 22 empennages are bumped into by hexagon socket head cap screw and are fixed in the valve seat trim ring 25 of valve body 6 outlet sides, and seat design is floating type, have the function at automatic adjustment center under the effect of valve plate 10.
The present invention realizes principle: the present invention does not have pin and connects metallic sealing butterfly valve, and spline is adopted in connecting between valve body 6 and the valve rod 9, has avoided valve internal to exist becoming flexible or the possibility of the component that easily come off.Valve rod 9 adopts integral structure, and position and transmission by the bearings in external rear bearing block assembly 1 and the front-end bearing pedestal assembly 13, improved the concentricity of valve greatly, reduced the frictional force of valve, reduce the keying moment of valve, avoided valve rod 10 and shaft room to produce the phenomenon of friction simultaneously.On valve rod 10, also be provided with anti-static device 8, make each component spare of valve keep good electrical conductivity, can eliminate the static that valve produces in running.Valve plate 10 adopts three eccentric structures, is producing under the effect of eccentric angle under the axial force, and during valve closing, the active force of valve plate 10 makes valve seat 22 that deformation take place, and until both tight connectings, forms the linear sealing of metal to metal; When opening, valve plate 10 sealing surfaces can realize hightailing valve seat 22, form " zero friction ", increase valve working life; This structure greatly reduces the frictional resistance of sealing pair and sealing surfaces wearing and tearing, has reduced valve opening moment, has prolonged valve working life, can be applicable to the fast shut-off occasion, has effectively avoided simultaneously because the electrostatic phenomenon that sliding friction produces.Valve seat 22 is U-shaped metal ring, but axial float, and there are certain clearance in 25 of valve seat 22 and valve seat trim rings, the center of the power automatic capturing valve plate 10 that can apply according to valve plate 10; Simultaneously, valve seat 22 inner chambers are hollow structure, and medium can enter, and make valve seat 22 have certain expansibility, more can effectively guarantee valve seal, improve valve working life; The seal ring 23 at valve seat 22 places and gasket seal 26 have guaranteed that medium does not have any possibility that leaks.
Above-described embodiment is to explanation of the present invention, is not limitation of the invention, any scheme after the simple transformation of the present invention is all belonged to protection scope of the present invention.
Claims (9)
1. a no pin connects metallic sealing butterfly valve, it is characterized in that: comprise rear bearing block assembly (1), follower bolt and nut (2), filler (4), valve body (6), valve rod (9), valve plate (10), filler gland (11), hold-down grid (12), front-end bearing pedestal assembly (13), the two ends of valve body (6) have stuffing hole, be provided with filler (4) in the stuffing hole, described filler (4) is pushed by filler gland (11) and hold-down grid (12), filler gland (11) and hold-down grid (12) adopt follower bolt and nut (2) to be fixed on the valve body (6), described rear bearing block assembly (1) and front-end bearing pedestal assembly (13) are placed on the two ends of valve body (6) respectively, described valve rod (9) positions and transmission by the bearing in rear bearing block assembly (1) and the front-end bearing pedestal assembly (13), valve rod (9) adopts integral structure, and valve plate (10) connects with valve rod (9) by spline structure.
2. a kind of no pin as claimed in claim 1 connects metallic sealing butterfly valve, it is characterized in that: be provided with valve seat (22) between described valve plate (10) and the valve body (6), described valve seat (22) is the U-shaped valve seat, and the empennage of valve seat (22) is bumped into by hexagon socket head cap screw (24) and is fixed in the valve seat trim ring (25) of valve body (6) outlet side.
3. a kind of no pin as claimed in claim 2 connects metallic sealing butterfly valve, and it is characterized in that: described valve plate (10) is three eccentric structures, makes sealing surface ovalize conical structure.
4. a kind of no pin as claimed in claim 1 connects metallic sealing butterfly valve, and it is characterized in that: also comprise filler spacer ring (5), described filler (4) is separated to form double-layer seal by filler spacer ring (5).
5. a kind of no pin as claimed in claim 1 connects metallic sealing butterfly valve, it is characterized in that: also comprise pretightening butterfly spring (3), between described follower bolt and nut (2) and the hold-down grid (12) pretightening butterfly spring (3) is set.
6. a kind of no pin as claimed in claim 1 connects metallic sealing butterfly valve, it is characterized in that: also comprise stop collar (7), described stop collar (7) is installed in the stuffing hole of valve body (6), and the cylindrical of stop collar (7) and valve body (6) are transition fit, prevents that stop collar (7) from rotating.
7. a kind of no pin as claimed in claim 6 connects metallic sealing butterfly valve, it is characterized in that: have the adjusting play between the front-end face of described stop collar (7) and the valve plate (10), have the gap between stop collar (7) and the valve rod (9).
8. a kind of no pin as claimed in claim 1 connects metallic sealing butterfly valve, it is characterized in that: described front-end bearing pedestal assembly (13) comprises front-end bearing pedestal (14), preceding deep groove ball bearing (15), gland screw (16), preceding gland (17), described front-end bearing pedestal (14) is fixedly connected with valve body (6), deep groove ball bearing (15) is built in the front-end bearing pedestal (14) before described, the outer ring of preceding deep groove ball bearing (15) is by preceding gland (17) location, front step on the described valve rod (9) is by the inner ring location of preceding deep groove ball bearing (15), and preceding gland (17) is fixedly connected by gland screw (16) and front-end bearing pedestal (14); Rear bearing block assembly (1) comprises gland screw (16), rear pressing cover (18), back deep groove ball bearing (19), adjust spacer (20), rear bearing block (21), described rear bearing block (21) is fixedly connected with valve body (6), back deep groove ball bearing (19) is built in the rear bearing block (21), the outer ring of back deep groove ball bearing (19) is by rear pressing cover (18) location, rear pressing cover (18) is fixedly connected by gland screw (16) and rear bearing block (21), is provided with between the backward step of the inner ring of back deep groove ball bearing (19) and valve rod (9) to adjust spacer (20).
9. connect metallic sealing butterfly valve as each described a kind of no pin in the claim 1 to 8, it is characterized in that: be provided with anti-static device (8) between described valve body (6) and the valve plate (10), described anti-static device (8) is made up of cylindrical spring and steel ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310254627.5A CN103322211B (en) | 2013-06-24 | 2013-06-24 | A kind of without pin connection metallic seal butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310254627.5A CN103322211B (en) | 2013-06-24 | 2013-06-24 | A kind of without pin connection metallic seal butterfly valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103322211A true CN103322211A (en) | 2013-09-25 |
| CN103322211B CN103322211B (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310254627.5A Active CN103322211B (en) | 2013-06-24 | 2013-06-24 | A kind of without pin connection metallic seal butterfly valve |
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| Country | Link |
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| CN (1) | CN103322211B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644309A (en) * | 2013-11-20 | 2014-03-19 | 江苏亿阀集团有限公司 | Low temperature resistant butterfly valve |
| CN104676019A (en) * | 2015-03-04 | 2015-06-03 | 江苏神通阀门股份有限公司 | Axial limiting structure of butterfly valve |
| CN105485355A (en) * | 2016-01-21 | 2016-04-13 | 江南阀门有限公司 | Hard-sealing and low-temperature butterfly valve and sealing method thereof |
| CN109931419A (en) * | 2019-04-09 | 2019-06-25 | 温州市瓯斯特阀门有限公司 | A kind of wear-resisting separable type fixing ball valve |
| CN115126883A (en) * | 2022-08-11 | 2022-09-30 | 中国空气动力研究与发展中心高速空气动力研究所 | Valve rod blowout prevention device for butterfly valve |
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| CN203335884U (en) * | 2013-06-24 | 2013-12-11 | 浙江中德自控阀门有限公司 | Metal seal butterfly valve free of being connected through pins |
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| CN2155475Y (en) * | 1993-04-27 | 1994-02-09 | 江都县特种阀门一厂 | U-shaped elastic metal sealing eccentric butterfly valve |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644309A (en) * | 2013-11-20 | 2014-03-19 | 江苏亿阀集团有限公司 | Low temperature resistant butterfly valve |
| CN103644309B (en) * | 2013-11-20 | 2017-01-18 | 江苏亿阀集团有限公司 | Low temperature resistant butterfly valve |
| CN104676019A (en) * | 2015-03-04 | 2015-06-03 | 江苏神通阀门股份有限公司 | Axial limiting structure of butterfly valve |
| CN105485355A (en) * | 2016-01-21 | 2016-04-13 | 江南阀门有限公司 | Hard-sealing and low-temperature butterfly valve and sealing method thereof |
| CN105485355B (en) * | 2016-01-21 | 2018-06-08 | 江南阀门有限公司 | A kind of hard sealing low temperature butterfly valve and its encapsulating method |
| CN109931419A (en) * | 2019-04-09 | 2019-06-25 | 温州市瓯斯特阀门有限公司 | A kind of wear-resisting separable type fixing ball valve |
| CN115126883A (en) * | 2022-08-11 | 2022-09-30 | 中国空气动力研究与发展中心高速空气动力研究所 | Valve rod blowout prevention device for butterfly valve |
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| Publication number | Publication date |
|---|---|
| CN103322211B (en) | 2016-06-29 |
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Address after: 313100 No. 659 Changxin Avenue, Taihu street, Zhejiang, Changxing County Applicant after: ZHEJIANG ZHONGDE AUTOMATIC CONTROL TECHNOLOGY CO., LTD. Address before: 313100, No. three, No. 659, Changxin Economic Development Zone, Huzhou, Zhejiang Applicant before: Zhejiang Zhongde Automatic Control Valve Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: ZHEJIANG ZHONGDE AUTOMATIC CONTROL VALVE CO., LTD. TO: ZHEJIANG ZHONGDE AUTOMATIC CONTROL TECHNOLOGY CO., LTD. |
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