CN103759024B - There is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function - Google Patents

There is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function Download PDF

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Publication number
CN103759024B
CN103759024B CN201410008910.4A CN201410008910A CN103759024B CN 103759024 B CN103759024 B CN 103759024B CN 201410008910 A CN201410008910 A CN 201410008910A CN 103759024 B CN103759024 B CN 103759024B
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China
Prior art keywords
valve
valve seat
butterfly valve
valve body
airtight tank
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CN201410008910.4A
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Chinese (zh)
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CN103759024A (en
Inventor
罗先武
陈晓刚
季斌
李振东
陈智本
王琳
黄仁芳
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TIELING SPECIAL VALVE CORP
Tsinghua University
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TIELING SPECIAL VALVE CORP
Tsinghua University
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Priority to CN201410008910.4A priority Critical patent/CN103759024B/en
Publication of CN103759024A publication Critical patent/CN103759024A/en
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Classifications

    • 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
    • F16K1/226—Shaping or arrangements of the sealing
    • F16K1/2268—Sealing means for the axis of rotation
    • 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
    • F16K1/224—Details of bearings for the axis of rotation
    • 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
    • F16K1/226—Shaping or arrangements of the sealing
    • F16K1/228—Movable sealing bodies
    • F16K1/2285—Movable sealing bodies the movement being caused by the flowing medium
    • 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
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F16K27/0218—Butterfly valves
    • 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
    • F16N—LUBRICATING
    • F16N1/00—Constructional modifications of parts of machines or apparatus for the purpose of lubrication

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)

Abstract

There is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function, relate to the bidirectional sealed butterfly valve of two bias or three eccentricity.Technical characteristics of the present invention is provided with in the valve body lower portion of butterfly valve the airtight tank arranged along valve interior wall circumferencial direction, valve interior wall is provided with the first elastic seal ring around this airtight tank, airtight tank is provided with water injection hole.The present invention can make valve seat can move more easily along valve body direction of axis line, and the operating characteristics of eccentric-butterfly-valve when opening and closing is significantly improved.Adopt press water passage and elastic seal ring to constitute jointly anti-sediment structure, in avoiding butterfly valve to use, in fluid, impurities enters the matching gap between valve shaft and axle sleeve, effectively prevents wearing and tearing, reaches the effect of protection valve shaft and axle sleeve simultaneously.The convenience of butterfly valve operation and the reliability of sealing when the present invention effectively can improve reverse pressure-bearing, and expand the Applicable scope of butterfly valve.

Description

There is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function
Technical field
The present invention relates to the bidirectional sealed butterfly valve with the floating type valve seat of fluid power and anti-silt function, particularly the bidirectional sealed butterfly valve of two bias or three eccentricity, be suitable for single-phase or containing solid impurity heterogeneous fluid and carry.
Background technique
The butterfly valve technology of current advanced person generally adopts the principle of two bias or three eccentricity, can reduce operational torque during butterfly valve forward pressure-bearing like this, makes the unlatching of valve with closed more convenient, quick.So, the eccentric-butterfly-valve using one-way sealing both at home and abroad more.For bidirectional sealed butterfly valve, when valve plate reverse pressure-bearing, not only face the butterfly valve because water opplied moment is large and open and close the problem of operating difficulties, and be easy to occur that frictional force between valve seat and valve body is excessive and the contingency such as can not normally opening of causing or closedown.In addition, in order to limit axial displacement when valve plate bears backpressure, bidirectional sealed butterfly valve often adopts integrally-built metal collar.When butterfly valve diameter is larger, the weight of metal collar is very large, makes the processing of butterfly valve like this and assembles very difficult.Therefore, by improving the structure of eccentric two-way seal butterfly valve, the performance optimizing bidirectional sealed butterfly valve is imperative.
Because butterfly valve is often used in the occasion containing solid phase impurity, in order to expand the engineer applied of eccentric two-way seal butterfly valve further, necessary innovation must be carried out to the valve shaft sealing structure of butterfly valve.
The present invention devises the bidirectional sealed butterfly valve with the floating type valve seat of fluid power and anti-silt function.This structure, except can effectively meet except the requirement of two way sealed, mainly by adopting the floating type valve seat of fluid power and blocking type back-up ring, improves the operating characteristics of butterfly valve, is conducive to the utilization efficiency improving butterfly valve; By increasing the structure with anti-silt function, making this butterfly valve go for containing the flowing of solid impurity, expanding the using scope of butterfly valve.
Summary of the invention
The object of the invention is the bidirectional sealed butterfly valve proposing there is the floating type valve seat of fluid power and anti-silt function, this structure mainly improves keying operating characteristics during eccentric-butterfly-valve reverse pressure-bearing, the requirement of the two way sealed of butterfly valve can be ensured, enhance the anti-silt effect of butterfly valve simultaneously, improve the performance of butterfly valve on the whole.
Technological scheme of the present invention is as follows:
There is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function, comprise valve body, valve seat, sealing clamp, valve plate, briquetting, back-up ring, Lower shaft sleeve and Lower shaft sleeve lubri-cating-water groove, lower valve shaft and upper valve shaft.Wherein sealing clamp is fixed on valve plate, and Lower shaft sleeve lubri-cating-water groove is located at the outer surface of Lower shaft sleeve; Lower valve shaft and upper valve shaft concentrically line, valve plate is supported by lower valve shaft and upper valve shaft.It is characterized in that: the bottom of described valve body is provided with airtight tank, this airtight tank is arranged along valve interior wall circumferencial direction, and the central angle θ that the radius R of airtight tank place circular arc is corresponding is 10 ° ~ 180 °, the width L=G of airtight tank 0/ [2p 01× R × sin (θ/2)], in formula: p 01for the hydraulic pressure in airtight tank, G 0for the weight of valve seat;
This airtight tank is provided with water injection hole, and water injection hole is connected with the external world through valve body; The inwall of valve body is provided with the first elastic seal ring around airtight tank.
Technical characteristics of the present invention is also: described valve body is provided with press water import and pressurized water outlet, press water import is connected with Lower shaft sleeve lubri-cating-water groove respectively with one end of pressurized water outlet, and press water import is connected with the external world respectively with the other end of pressurized water outlet; The second elastic seal ring and the 3rd elastic seal ring is respectively equipped with at the two ends of Lower shaft sleeve.
Another technical characteristics of the present invention is: described back-up ring adopts fraction block structure, and is embedded on valve body; Back-up ring is fixed with along the circumferential direction uniform briquetting.
Axial clearance is provided with between described valve seat and valve body.
The present invention compared with prior art, has the following advantages and technique effect: 1. because airtight tank is arranged on the bottom of valve body, and hydraulic pressure acts on the direction of valve seat for vertically upward, namely contrary with the action direction of gravity.When butterfly valve starts, the clear water with certain pressure passes into airtight tank via water injection hole.Valve seat enters state of suspension (namely now the active force of water is more than or equal to the gravity of valve seat) under the pressure effect passing into clear water, becomes the floating type valve seat of fluid power.Make valve seat can move more easily along valve body direction of axis line like this, thus the operating characteristics of eccentric-butterfly-valve when opening and closing is significantly improved.2. adopt press water passage and elastic seal ring to constitute jointly anti-sediment structure, in avoiding butterfly valve to use, in fluid, impurities enters the matching gap between valve shaft and axle sleeve, effectively prevents wearing and tearing, reaches the effect of protection valve shaft and axle sleeve; Press water passage is directly communicated with Lower shaft sleeve lubri-cating-water groove, enhances the effect of lubricative axle sleeve.3. the back-up ring of butterfly valve have employed split type structural type, overcomes eccentric butter-fly valve and to maximize the processing that brings and the shortcoming of assembling difficulty, be also conducive to the manufacture and the assembly precision that improve butterfly valve.4. be provided with axial clearance between valve seat and valve body, the axial position adjustment of valve seat during butterfly valve reverse pressure-bearing can be ensured, effectively realize the two way sealed function of butterfly valve.
The structure of bidirectional sealed butterfly valve can be made so compacter, and processing is convenient with assembling, swift to operate, reliable operation, and the Applicable scope of effective expansion butterfly valve.
Accompanying drawing explanation
Fig. 1 is the main sectional view with the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function provided by the invention.
Fig. 2 is the sectional view of K-K section in Fig. 1.
Fig. 3 is the A partial enlarged drawing of Fig. 1.
Fig. 4 is the partial enlarged drawing of lower valve shaft and surrounding structure.
Fig. 5 is the C partial enlarged drawing of Fig. 1.
Fig. 6 is the structural drawing of back-up ring.
In figure: 1-valve body; 2-valve seat; 3-sealing clamp; 4-valve plate; 5-briquetting; 6-back-up ring; 7-water injection hole; The airtight tank of 8-; 9-first elastic seal ring; 10-axial clearance; The import of 11-press water; 12-Lower shaft sleeve; 13-second elastic seal ring; 14-pressurized water outlet; 15-lower valve shaft; 16-the 3rd elastic seal ring; The upper valve shaft of 17-; 18-Lower shaft sleeve lubri-cating-water groove; 19-first piecemeal; 20-second piecemeal; 21-back-up ring fixed plate.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention, structure are further described.
Fig. 1 is the main sectional view of the bidirectional sealed butterfly valve with the floating type valve seat of fluid power and anti-silt function.This bidirectional sealed butterfly valve comprises valve body 1, valve seat 2, sealing clamp 3, valve plate 4, briquetting 5, back-up ring 6, Lower shaft sleeve 12, Lower shaft sleeve lubri-cating-water groove 18, lower valve shaft 15 and upper valve shaft 17.Sealing clamp 3 is fixed on valve plate 4; Lower valve shaft 15 and upper valve shaft 17 concentrically line, and be installed on valve body 1; Valve plate 4 is by lower valve shaft 15 and upper valve shaft 17 common support.When upper valve shaft 17 rotates under external force, band moving valve rotates around the center line of upper valve shaft, realizes the opening and closing of butterfly valve.
When water (flow) direction is forward (namely from right to left), the trend that valve plate 4 is subject to hydraulic pressure effect and has to left movement.Because sealing clamp 3 and the surface of contact of valve seat 2 are the conical surface, the water pressure that valve plate bears is transmitted to valve body 1 by valve seat 2 and back-up ring 6.Make sealing clamp 3 and valve seat 2 keep close contact like this, realize forward sealing.
When water (flow) direction is reverse (namely from left to right), valve plate 4 is subject to hydraulic pressure effect and has the trend moved right.Because be provided with axial clearance 10 between valve seat 2 and valve body 1, the water pressure acted on back-up ring 6 promotes valve seat 2 by briquetting 5 and moves right, thus ensures the excellent sealing effect between sealing clamp 3 and valve seat 2.
In order to ensure that butterfly valve opens and closes smoothly, be provided with airtight tank 8 in valve body 1 bottom, this airtight tank is arranged along valve interior wall circumferencial direction, and the central angle θ that the radius R of place circular arc is corresponding is 10 ° ~ 180 °, the width L=G of airtight tank 0/ [2p 01× R × sin (θ/2)], wherein, p 01for the hydraulic pressure in airtight tank, G 0for the weight of valve seat 2.Valve body 1 is provided with the first elastic seal ring 9 around airtight tank, and the fluid inside and outside airtight tank and valve body is isolated in its effect.Airtight tank is provided with water injection hole 7, and water injection hole is connected with the external world through valve body.
Enter state of suspension (namely now the active force of hydraulic pressure is more than or equal to the gravity of valve seat) under the effect of water pressure of valve seat 2 in airtight tank, become the floating type valve seat of fluid power.Valve seat is made to be easy to mobile along valve body direction of axis line like this, the convenience of butterfly valve operation and the reliability of sealing when effectively can improve reverse pressure-bearing.
In order to expand the Applicable scope of bidirectional sealed butterfly valve, press water import 11 and pressurized water outlet 14 is also arranged in the bottom of valve body 1, press water import 11 is connected with Lower shaft sleeve lubri-cating-water groove 18 separately with one end of pressurized water outlet 14, and press water import 11 is connected with the external world separately with pressurized water outlet 14 the other end.When valve starts or close, press water (hydraulic pressure should be greater than butterfly valve working pressure) enters Lower shaft sleeve 12 from press water import 11, play the effect of lubrication Lower shaft sleeve on the one hand, compress the second elastic seal ring 13 and the 3rd elastic seal ring 16 at Lower shaft sleeve two ends on the one hand, stop silt and other impurity to enter Lower shaft sleeve.This part pressure water is finally outside pressurized water outlet 14 exits valve body.
Butterfly valve have employed the back-up ring 6 of fraction block structure, and this back-up ring is embedded on valve body 1, is made up of the first piecemeal 19, second piecemeal 20 and back-up ring fixed plate 21.First piecemeal and the second piecemeal are bolted on back-up ring fixed plate.The quantity of the first piecemeal and the second piecemeal determines according to the size of butterfly valve, with the processing of each part of convenient back-up ring be assembled into principle.This structure overcomes traditional integral type back-up ring in processing, the shaping and narrow limitation installed, adapts to the needs that butterfly valve maximizes better.Back-up ring is fixed with along the circumferential direction uniform briquetting 5.
The working procedure with the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function is as follows:
When butterfly valve normally uses, the clear water of certain pressure (hydraulic pressure should be greater than butterfly valve working pressure) must be passed into from press water import 11.When needs opened butterfly valve, upper valve shaft 17 rotates under applied moment effect, drives valve plate 4 to rotate at the inner chamber of valve body 1.Make sealing clamp 3 and valve seat 2 disengage like this, the fluid of valve plate both sides is interconnected.When butterfly valve closed by needs, upper valve shaft 17 rotates under applied moment effect, drives valve plate 4 to rotate at the inner chamber of valve body 1.The sealing clamp 3 be fixed on valve plate 4 contacts gradually with valve seat 2.If flow direction from right to left, then valve plate 4 is subject to hydraulic pressure effect and the trend had to left movement.Because sealing clamp 3 and the surface of contact of valve seat 2 are the conical surface, make sealing clamp 3 and valve seat 2 close contact like this, cut off the connection of valve plate two side liquid, the water pressure of simultaneously valve plate bearing is transmitted to valve body 1 by valve seat 2 and back-up ring 6; When water (flow) direction from left to right time, valve plate 4 is subject to hydraulic pressure effect and has the trend moved right.Under hydraulic pressure effect, promotion valve seat 2 moves right by back-up ring 6 and briquetting 5, thus ensures the excellent sealing effect between sealing clamp 3 and valve seat 2.
For macrotype butterfly valve, because valve seat has larger weight, between itself and valve body, there is larger frictional force.For this reason, being the clear water of p01 from water injection hole 7 injection pressure in advance when operating butterfly valve, passing into airtight tank 8.Due to airtight tank 8 by the first elastic seal ring 9 around, the water in airtight tank 8 and other fluid inside and outside valve body are in isolation.Valve seat 2 enters state of suspension (namely the active force of water is more than or equal to the gravity of valve seat) under the effect passing into press water, becomes the floating type valve seat of fluid power.Make the frictional force between valve seat and valve body greatly reduce like this, back-up ring and briquetting are just easy to promote valve seat and move right, thus ensure that valve seat and sealing clamp 3 fit tightly.
Therefore, the convenience of eccentric-butterfly-valve operation and the reliability of sealing when adopting structure of the present invention effectively can improve reverse pressure-bearing, and expand the Applicable scope of butterfly valve.

Claims (4)

1. there is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function, comprise valve body (1), valve seat (2), sealing clamp (3), valve plate (4), briquetting (5), back-up ring (6), Lower shaft sleeve (12), Lower shaft sleeve lubri-cating-water groove (18), lower valve shaft (15) and upper valve shaft (17); Described sealing clamp (3) is fixed on valve plate (4), and Lower shaft sleeve lubri-cating-water groove (18) is located at the outer surface of Lower shaft sleeve (12); Described lower valve shaft (15) and upper valve shaft (17) concentrically line, and be arranged on valve body (1); Valve plate (4) is by lower valve shaft (15) and upper valve shaft (17) common support, it is characterized in that: the bottom of described valve body (1) is provided with airtight tank (8), this airtight tank is arranged along valve body (1) inwall circumferencial direction, the central angle θ that the radius R of airtight tank place circular arc is corresponding is 10 ° ~ 180 °, the width L=G of airtight tank 0/ [2p 01' R ' sin (θ/2)];
In formula: p 01for the hydraulic pressure in airtight tank, G 0for the weight of valve seat (2); This airtight tank (8) is provided with water injection hole (7), and water injection hole is connected with the external world through valve body; The inwall of valve body is provided with the first elastic seal ring (9) around airtight tank.
2. according to the bidirectional sealed butterfly valve with the floating type valve seat of fluid power and anti-silt function according to claim 1, it is characterized in that: described valve body (1) is provided with press water import (11) and pressurized water outlet (14), press water import (11) is connected with Lower shaft sleeve lubri-cating-water groove (18) respectively with one end of pressurized water outlet (14), and press water import (11) is connected with the external world respectively with pressurized water outlet (14) the other end; The second elastic seal ring (13) and the 3rd elastic seal ring (16) is respectively equipped with at the two ends of Lower shaft sleeve (12).
3. according to the bidirectional sealed butterfly valve with the floating type valve seat of fluid power and anti-silt function described in claim 1 or 2, it is characterized in that: described back-up ring (6) adopts fraction block structure, and is embedded on valve body (1); Described briquetting (5) is along the circumferential direction distributed on this back-up ring.
4. according to the bidirectional sealed butterfly valve with the floating type valve seat of fluid power and anti-silt function described in claim 1 or 2, it is characterized in that: between described valve seat (2) and valve body (1), be provided with axial clearance (10).
CN201410008910.4A 2014-01-08 2014-01-08 There is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function Active CN103759024B (en)

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Application Number Priority Date Filing Date Title
CN201410008910.4A CN103759024B (en) 2014-01-08 2014-01-08 There is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function

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CN201410008910.4A CN103759024B (en) 2014-01-08 2014-01-08 There is the bidirectional sealed butterfly valve of the floating type valve seat of fluid power and anti-silt function

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CN103759024B true CN103759024B (en) 2016-04-20

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109899533B (en) * 2019-03-08 2020-06-05 河南宇宙流体科技有限公司 Energy-saving rubber sealing butterfly valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5655760A (en) * 1979-10-15 1981-05-16 Hitachi Ltd Water seal device for fluid valve
CN200993241Y (en) * 2006-12-05 2007-12-19 江苏神通阀门股份有限公司 Water-sealed butterfly valve
CN101713468A (en) * 2009-11-17 2010-05-26 江苏省鑫通阀门制造有限公司 Butterfly valve with single valve seat and multi-sealing structure
CN103375595A (en) * 2012-04-12 2013-10-30 上海康泉阀门有限公司 Zero-friction bidirectional metal seal butterfly valve
CN103383008A (en) * 2013-08-09 2013-11-06 博纳斯威阀门有限公司 Water seal butterfly valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5655760A (en) * 1979-10-15 1981-05-16 Hitachi Ltd Water seal device for fluid valve
CN200993241Y (en) * 2006-12-05 2007-12-19 江苏神通阀门股份有限公司 Water-sealed butterfly valve
CN101713468A (en) * 2009-11-17 2010-05-26 江苏省鑫通阀门制造有限公司 Butterfly valve with single valve seat and multi-sealing structure
CN103375595A (en) * 2012-04-12 2013-10-30 上海康泉阀门有限公司 Zero-friction bidirectional metal seal butterfly valve
CN103383008A (en) * 2013-08-09 2013-11-06 博纳斯威阀门有限公司 Water seal butterfly valve

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