CN107725795B - PRATT large-diameter butterfly valve valve seat insert replacing options - Google Patents
PRATT large-diameter butterfly valve valve seat insert replacing options Download PDFInfo
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- CN107725795B CN107725795B CN201710778163.6A CN201710778163A CN107725795B CN 107725795 B CN107725795 B CN 107725795B CN 201710778163 A CN201710778163 A CN 201710778163A CN 107725795 B CN107725795 B CN 107725795B
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- valve seat
- injecting glue
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- seat insert
- pratt
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- 239000003292 glue Substances 0.000 claims abstract description 80
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 19
- 239000003822 epoxy resin Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 229920000647 polyepoxide Polymers 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 4
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- 229940106691 bisphenol a Drugs 0.000 claims description 3
- 210000000080 chela (arthropods) Anatomy 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 210000002445 nipple Anatomy 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000002269 spontaneous effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000008439 repair process Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000011160 research Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 241001573355 Schizomussaenda henryi Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
-
- 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
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention belongs to power station operating maintenance technical fields, more particularly to a kind of PRATT large-diameter butterfly valve valve seat insert replacing options, purpose is to research and develop the valve seat insert replacement technology of heavy caliber PRATT butterfly valve, solve the problems, such as that such large-diameter butterfly valve equipment country, three factories can not repair, spare parts purchasing and site examining and repairing cost are saved, work on the spot demand is met.It is characterized by: it includes the steps that clearing up air test, injecting glue and the dress watch before old valve seat, equipped valve seat, injecting glue.It is repaired from PRATT butterfly valve seat sealing ring after replacing technological development success, successively amounts to and successfully repaired about 130 Taiwan Straits water system PRATT large-diameter butterfly valves, save about 50,000,000 yuan of equipment purchase fund or more.
Description
Technical field
The invention belongs to power station operating maintenance technical fields, and in particular to a kind of PRATT large-diameter butterfly valve valve seat insert
Replacing options.
Background technique
Three factory's sea water service system heavy caliber PRATT butterfly valve of the Qin is the manufacturing of U.S. HENRY PRATT company, dimensions master
Have 42 ", 54 ", 90 " and 108 ", two unit equipment total numbers are 72.Because system arrangement, valve structural design,
The composite factors such as in-site installation mode and three phases severe briny environment influence, and cause this kind of large-diameter butterfly valve equipment in scene big
Part premature failure, scene need timely repair process.
In view of the factors such as site examining and repairing environment and equipment deficiency processing requirement, scene generally all takes directly replacement whole
Spare part is come the defect elimination at the scene of completing.For many years, scene is replaced such number of devices to get off and has been increasing.Because of these equipment
Purchase cost is very high (every equipment purchase expense is 40 to 2,000,000 yuan or so and differs), needs to implement repair process, extends equipment
Service life saves spare parts purchasing expense.
Three factory's sea water service system large-diameter butterfly valves are that the Triton-XR70 series of U.S. Henry Pratt company design is single inclined
The heart, line with rubber, soft seal electric butterfly valve (being detailed in Fig. 1), primary structure include valve seat 1, butterfly plate 2, valve rod 3, promote 4 and valve body 5.
Such equipment valve seat insert uses E-LOK Seal Design, and rubber valve seat sealing ring is hollow design, and overall structure is semicircle
Shape, surface design have multiple tooth seal line.After the sealing ring is installed in the dovetail groove of valve seat, by injection special glue to sealing ring
It is fixed, the installation requirement (being detailed in Fig. 2) of the valve seat insert is reached using some technical characterstics after dedicated adhesive curing.
Reparation for such valve, we face the replacement that main difficulty is exactly valve seat insert, and for relevant
Special glue ingredient and performance and sealing ring replacement concrete operation method etc., Pratt company implements technology blockage.
To solve three factories to replaced numerous implementable effective reparations of heavy caliber PRATT butterfly valve equipment, scene is saved
The cost of overhaul needs to research and develop the valve seat insert replacement technology of such heavy caliber PRATT butterfly valve, thoroughly breaks external producer's technology
Block meets three factory's work on the spot demands.
Summary of the invention
The purpose of the present invention is the valve seat inserts of research and development heavy caliber PRATT butterfly valve to replace technology, and solving three factories, such is big
The bore butterfly valve equipment country can not repair problem, save spare parts purchasing and site examining and repairing cost, meet work on the spot demand.
The present invention is implemented as follows:
A kind of PRATT large-diameter butterfly valve valve seat insert replacing options, specifically comprise the following steps:
Step 1: old valve seat is cleared up
Step 1.1: horizontal positioned valve body, and make sealing surface of seat one end upward, butterfly plate is opened, old valve seat is removed；
Step 1.2: cleaning scrap rubber and valve seat fragment make valve seat mounting groove keep clean；
Step 1.3: the hole for injecting glue of two injecting glues and tapping are symmetrically bored in valve flange plane；
Step 1.4: with sand paper polishing valve seat mounting groove, so that the inner wall surface layer of slot is exposed matrix and scrub；
Step 2: equipped valve seat
Step 2.1: clamping valve seat insert with rubber pincers, squeeze into valve seat mounting groove, squeeze into valve seat in 180 ° of directions of face
Sealing ring, while valve seat insert is beaten with rubber hammer, feed them into predetermined size range；
Step 2.2: valve seat insert is gradually got on a point both sides, is tapped valve seat insert with rubber hammer, is allowed to fully enter
Valve seat mounting groove；
Step 2.3: close butterfly plate, adjust the center of butterfly plate so that butterfly plate outer circle between body cavity at a distance from phase
Unanimously, while checking whether butterfly plate is completely closely sealed with valve seat；
Step 3: the air test before injecting glue
Step 3.1: connecting test pipeline, adjust test bleed pressure；
Step 3.2: closing a pipe nipple, block a hole for injecting glue, slowly filled from another hole for injecting glue to valve seat mounting groove
Gas, while full circumference checks whether gas leakage, adjustment valve seat is gently shaken with rubber hammer, it is ensured that valve base cavity is fully sealed；
Step 3.3: gradually boosting makes valve seat insert sufficiently outwardly against butterfly plate；
Step 4: special glue modulation
Bisphenol-A epoxy type resin glue and complete curing agent are selected, epoxy resin and curing agent carry out 60 DEG C of bakings simultaneously
2.5 hours or more；
To be subject to adequately to stir to exhaust the air in epoxy resin in modulation, after resin glue color is uniform, pour into
Injecting glue is carried out in injecting glue tank；
Step 5: injecting glue
Step 5.1: first using compressed air purging valve seat insert inner cavity, keep clean injecting glue again；
Step 5.2: when starting injecting glue, using injecting glue tool, into a hole for injecting glue, injecting glue, initial injection pressure are
0.3MPa keeps injection pressure to stablize, and subsequent injection pressure is in 0.5~0.6MPa, until another hole for injecting glue flows out asphalt mixtures modified by epoxy resin
Until rouge；
Step 5.3: after another hole for injecting glue extrusion, confirmation is discharged without air resin glue, closes another hole for injecting glue, delays
The slow injection pressure that promoted checks that whether there is or not resin leakages around valve seat insert to 0.7MPa, and confirms that valve seat insert is expanded into
Position；
Step 5.4: closing butterfly plate, but retain 2 °~5 ° apertures；
Step 5.5: pressure being unloaded down, 0.3MPa is dropped to and keeps stable, resin glue is allowed slowly to solidify；
Step 5.6: removing relevant injecting glue tool, and continue spontaneous curing at least 12 hours；
Step 6: dress watch
After the work of valve seat insert injecting glue is fully completed, opens butterfly plate and check whether valve seat insert is installed with valve seat completely
The fixed bonding of slot, the foreign matter on cleaning removal valve seat insert surface.
The mass ratio of step 4 as described above, curing agent and epoxy resin is 1:6.
Step 5 as described above, injecting glue time are 20 minutes.
Step 5.5 as described above, the setting time of resin glue are 20~24 hours.
The beneficial effects of the present invention are:
It is repaired from PRATT butterfly valve seat sealing ring after replacing technological development success, successively amounts to and successfully repaired about 130
Taiwan Straits water system PRATT large-diameter butterfly valve saves about 50,000,000 yuan of equipment purchase fund or more.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of PRATT large-diameter butterfly valve；
Fig. 2 is the sealing ring mounting structure schematic diagram of PRATT large-diameter butterfly valve.
Wherein: 1. valve seats, 2. butterfly plates, 3. valve rods, 4. promote, 5. valve bodies, 6. valve flanges, 7. hole for injecting glue, 8. valve seats peace
Tankage, 9. valve seat inserts.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and examples.
A kind of PRATT large-diameter butterfly valve valve seat insert replacing options, specifically comprise the following steps:
Step 1: old valve seat is cleared up
Step 1.1: horizontal positioned valve body 5, and make sealing surface of seat one end upward, butterfly plate 2 is opened, old valve seat 1 is removed.
Step 1.2: cleaning scrap rubber and valve seat fragment keeps valve seat mounting groove 8 completely, and damage valve seat should be avoided in when work
8 surface of mounting groove.
Step 1.3: the hole for injecting glue 7 of two injecting glues and tapping are symmetrically bored in 6 plane of valve flange.
Step 1.4: with sand paper polishing valve seat mounting groove 8, so that the inner wall surface layer of slot is exposed matrix and scrub.
Step 2: equipped valve seat
Step 2.1: clamping valve seat insert 9 with rubber pincers, squeeze into valve seat mounting groove 8, squeeze into valve in 180 ° of directions of face
Seat sealing ring 9, while valve seat insert 9 is beaten with rubber hammer, feed them into predetermined size range；
Step 2.2: valve seat insert 9 is gradually got on point both sides, with rubber hammer tap valve seat insert 9, be allowed to all into
Enter valve seat mounting groove 8；
Step 2.3: close butterfly plate 2, adjust butterfly plate 2 center so that between 5 inner cavity of 2 outer circle of butterfly plate and valve body away from
From consistent, while checking whether butterfly plate 2 is completely closely sealed with valve seat 1；
Step 3: the air test before injecting glue
Step 3.1: connecting test pipeline, adjust test bleed pressure.
Step 3.2: closing a pipe nipple, block a hole for injecting glue 7, slowly from another hole for injecting glue 7 to valve seat mounting groove 8
Inflation, while full circumference checks whether gas leakage, and adjustment valve seat 1 is gently shaken with rubber hammer, closes gas source when necessary and readjusts
Valve seat 1, it is ensured that 1 inner cavity of valve seat is fully sealed.
Step 3.3: gradually boosting makes valve seat insert 9 sufficiently outwardly against butterfly plate.
Step 4: special glue modulation
Select relevant bisphenol-A epoxy type resin glue, i.e. 0164 epoxy resin and complete curing agent, epoxy resin and solid
Agent carries out 60 DEG C of bakings 2.5 hours or more simultaneously, and according to current weather conditions, modulates mass ratio appropriate and adjusted
With epoxy resin.The mass ratio general control of curing agent and epoxy resin is in 1:6.
To be subject to adequately to stir to exhaust the air in epoxy resin in modulation, after resin glue color is uniform, pour into
Injecting glue is carried out in injecting glue tank, the injecting glue time must complete at 20 minutes.
Step 5: injecting glue
Step 5.1: first using 9 inner cavity of compressed air purging valve seat insert, keep clean injecting glue again.
Step 5.2: when starting injecting glue, using injecting glue tool, into a hole for injecting glue 7, injecting glue, initial injection pressure are
0.3MPa keeps injection pressure to stablize, mitigation, unsuitable too fast, and subsequent injection pressure keeps stablizing, air pressure 0.5~
0.6MPa, until another hole for injecting glue 7 flows out epoxy resin.
Step 5.3: after another hole for injecting glue 7 extrusion, confirmation is discharged without air resin glue, closes another hole for injecting glue 7,
It slowly promotes injection pressure and checks that whether there is or not resin leakages around valve seat insert 9 to 0.7MPa, and confirm that valve seat insert 9 is swollen
It is swollen in place.
Step 5.4: closing butterfly plate 2, but retain certain aperture.Different according to valve size specification, corresponding butterfly plate is opened
Degree is also different, and for the PRATT butterfly valve of theme, 2 aperture general control of butterfly plate at this time is between 2 ° -5 °.
Step 5.5: pressure being unloaded down, 0.3MPa is dropped to and keeps stable, resin glue is allowed slowly to solidify.According at that time
Environment temperature is different, and the setting time of resin glue is almost between 20~24 hours.
After step 5.6:24 hours, relevant injecting glue tool is removed, and continues spontaneous curing at least 12 hours.
Step 6: dress watch
After the work of 9 injecting glue of valve seat insert is fully completed, opens butterfly plate 2 and check valve seat insert 9 whether completely and valve seat
The fixed bonding of mounting groove 8, the foreign matter on cleaning removal 9 surface of valve seat insert.
The above is only the preferred embodiments of the invention, is illustrated herein: method based on the principle of the invention improve and
Structural adjustment all will be regarded as protection scope of the present invention.
Claims (4)
1. a kind of PRATT large-diameter butterfly valve valve seat insert replacing options, specifically comprise the following steps:
Step 1: old valve seat is cleared up
Step 1.1: horizontal positioned valve body (5), and make sealing surface of seat one end upward, it opens butterfly plate (2), removes old valve seat
(1)；
Step 1.2: cleaning scrap rubber and valve seat (1) fragment make valve seat mounting groove (8) to keep clean；
Step 1.3: the hole for injecting glue (7) of two injecting glues and tapping are symmetrically bored in valve flange (6) plane；
Step 1.4: being polished valve seat mounting groove (8) with sand paper, so that the inner wall surface layer of slot is exposed matrix and scrub；
Step 2: equipped valve seat
Step 2.1: clamping valve seat insert (9) with rubber pincers, squeeze into valve seat mounting groove (8), squeeze into valve in 180 ° of directions of face
Seat sealing ring (9), while valve seat insert (9) are beaten with rubber hammer, feed them into predetermined size range；
Step 2.2: valve seat insert (9) are gradually got on point both sides, with rubber hammer tap valve seat insert (9), be allowed to all into
Enter valve seat mounting groove (8)；
Step 2.3: closing butterfly plate (2), the center of butterfly plate (2) is adjusted, so that between butterfly plate (2) outer circle and valve body (5) inner cavity
Distance it is consistent, while check butterfly plate (2) whether with valve seat (1) completely it is closely sealed；
Step 3: the air test before injecting glue
Step 3.1: connecting test pipeline, adjust test bleed pressure；
Step 3.2: closing a pipe nipple, block a hole for injecting glue (7), delay from another hole for injecting glue (7) to valve seat mounting groove (8)
Trickle charge gas, while full circumference checks whether gas leakage, adjustment valve seat (1) is gently shaken with rubber hammer, it is ensured that valve seat (1) inner cavity is complete
Sealing；
Step 3.3: gradually boosting makes valve seat insert (9) sufficiently outwardly against butterfly plate；
Step 4: special glue modulation
Bisphenol-A epoxy type resin glue and complete curing agent are selected, it is small that epoxy resin and curing agent carry out 60 DEG C of bakings 2.5 simultaneously
When more than；
To be subject to adequately to stir to exhaust the air in epoxy resin in modulation, after resin glue color is uniform, pour into injecting glue
Injecting glue is carried out in tank；
Step 5: injecting glue
Step 5.1: first using compressed air purging valve seat insert (9) inner cavity, keep clean injecting glue again；
Step 5.2: when starting injecting glue, using injecting glue tool to an interior injecting glue of hole for injecting glue (7), initial injection pressure is
0.3MPa keeps injection pressure to stablize, and subsequent injection pressure is in 0.5~0.6MPa, until another hole for injecting glue (7) flows out epoxy
Until resin；
Step 5.3: after resin glue is squeezed out from another hole for injecting glue (7), confirmation is discharged without air, closes another hole for injecting glue (7),
It slowly promotes injection pressure and checks that whether there is or not resin leakages around valve seat insert (9) to 0.7MPa, and confirm valve seat insert
(9) it expands in place；
Step 5.4: closing butterfly plate (2), but retain 2 °~5 ° apertures；
Step 5.5: pressure being unloaded down, 0.3MPa is dropped to and keeps stable, resin glue is allowed slowly to solidify；
Step 5.6: removing relevant injecting glue tool, and continue spontaneous curing at least 12 hours；
Step 6: dress watch
After the work of valve seat insert (9) injecting glue is fully completed, opens butterfly plate (2) and check valve seat insert (9) whether completely and valve
The fixed bonding of seat mounting groove (8), the foreign matter on cleaning removal valve seat insert (9) surface.
2. PRATT large-diameter butterfly valve valve seat insert replacing options according to claim 1, it is characterised in that: described
The mass ratio of step 4, curing agent and epoxy resin is 1:6.
3. PRATT large-diameter butterfly valve valve seat insert replacing options according to claim 1, it is characterised in that: described
Step 5, injecting glue time are 20 minutes.
4. PRATT large-diameter butterfly valve valve seat insert replacing options according to claim 1, it is characterised in that: described
Step 5.5, the setting time of resin glue is 20~24 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710778163.6A CN107725795B (en) | 2017-09-01 | 2017-09-01 | PRATT large-diameter butterfly valve valve seat insert replacing options |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710778163.6A CN107725795B (en) | 2017-09-01 | 2017-09-01 | PRATT large-diameter butterfly valve valve seat insert replacing options |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107725795A CN107725795A (en) | 2018-02-23 |
| CN107725795B true CN107725795B (en) | 2019-08-13 |
Family
ID=61204925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710778163.6A Active CN107725795B (en) | 2017-09-01 | 2017-09-01 | PRATT large-diameter butterfly valve valve seat insert replacing options |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107725795B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109079701B (en) * | 2018-09-21 | 2020-06-16 | 上海沪东造船阀门有限公司 | Auxiliary tool for pre-assembling butterfly valve sealing ring and method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5975494A (en) * | 1995-10-12 | 1999-11-02 | Orbit Valve Company | Replaceable seal members for butterfly valve |
| CN1409037A (en) * | 2001-09-25 | 2003-04-09 | 上海冠龙阀门机械有限公司 | Composite elastic soft sealing |
| CN101451626A (en) * | 2008-12-30 | 2009-06-10 | 广东联塑市政工程管道有限公司 | Method for replacing valve sealing filler |
| CN202100740U (en) * | 2011-06-08 | 2012-01-04 | 无锡市宝牛阀业有限公司 | Three-eccentric sealing butterfly valve |
| CN202252028U (en) * | 2011-09-21 | 2012-05-30 | 铁岭方众阀门有限公司 | Metal-rubber sealing sub butterfly valve |
| EP2657582A1 (en) * | 2012-04-27 | 2013-10-30 | Metso Automation MAPAG GmbH | Shut-off valve with a shut-off disc with a rotating bearing |
| CN203656229U (en) * | 2013-11-15 | 2014-06-18 | 浙江时代铸造有限公司 | Butterfly plate device for butterfly valve |
-
2017
- 2017-09-01 CN CN201710778163.6A patent/CN107725795B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5975494A (en) * | 1995-10-12 | 1999-11-02 | Orbit Valve Company | Replaceable seal members for butterfly valve |
| CN1409037A (en) * | 2001-09-25 | 2003-04-09 | 上海冠龙阀门机械有限公司 | Composite elastic soft sealing |
| CN101451626A (en) * | 2008-12-30 | 2009-06-10 | 广东联塑市政工程管道有限公司 | Method for replacing valve sealing filler |
| CN202100740U (en) * | 2011-06-08 | 2012-01-04 | 无锡市宝牛阀业有限公司 | Three-eccentric sealing butterfly valve |
| CN202252028U (en) * | 2011-09-21 | 2012-05-30 | 铁岭方众阀门有限公司 | Metal-rubber sealing sub butterfly valve |
| EP2657582A1 (en) * | 2012-04-27 | 2013-10-30 | Metso Automation MAPAG GmbH | Shut-off valve with a shut-off disc with a rotating bearing |
| CN203656229U (en) * | 2013-11-15 | 2014-06-18 | 浙江时代铸造有限公司 | Butterfly plate device for butterfly valve |
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| Publication number | Publication date |
|---|---|
| CN107725795A (en) | 2018-02-23 |
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