US20050274014A1 - Manufacturing process to make a valve ball - Google Patents
Manufacturing process to make a valve ball Download PDFInfo
- Publication number
- US20050274014A1 US20050274014A1 US10/852,563 US85256304A US2005274014A1 US 20050274014 A1 US20050274014 A1 US 20050274014A1 US 85256304 A US85256304 A US 85256304A US 2005274014 A1 US2005274014 A1 US 2005274014A1
- Authority
- US
- United States
- Prior art keywords
- valve ball
- punched
- manufacturing process
- punch
- top hat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
-
- 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
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49405—Valve or choke making
- Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49405—Valve or choke making
- Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
- Y10T29/49414—Joining plural semi-circular components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49405—Valve or choke making
- Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
- Y10T29/49416—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49405—Valve or choke making
- Y10T29/49412—Valve or choke making with assembly, disassembly or composite article making
- Y10T29/49416—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting
- Y10T29/49423—Valve or choke making with assembly, disassembly or composite article making with material shaping or cutting including metal deforming
Definitions
- the present invention relates to hydro-electric parts and more particularly to a manufacturing process to make a valve ball which has two layers made up with punching method.
- FIG. 12 shows a valve ball 70 which is made with forging process and has a pair of identical hemi-spherical housings 71 each of which has a passage way 72 in the center.
- the pair of hemi-spherical housings are connected together by welding means to finish a valve ball 70 . Due to that a forging object has to be through a chemical disposal. There must be the residual chemicals remained on the surface of the valve ball 70 which may harm the human health if it is used in a water supply system. However, most of the producers are now gave up this process.
- valve ball 80 which is made with continuous punching method. So it punches a copper plate 81 at first, then punch the plate 81 into the small arcuate pieces 81 ′, and punch again the small arcuate pieces 81 ′ into the large circular pieces 81 ′′ and then punch the large circular pieces 81 ′′ into the hemi-spherical pieces. Finally, put a pair of the hemi-spherical pieces respectively into an upper and a lower mold to facilitate a welding procedure. A valve ball is therefore accomplished after the polishing of the connection seam. This manufacturing process is somewhat too complicated in comparison with other manufacturing process because it wastes time and is unpractical.
- FIGS. 16 to 19 show still another prior art valve ball which also adapts repeated punching process. It punches a piece of plate into a cup shaped semi-finished product 91 and punch the semi-finished products 91 with an upper and lower mold into the hemi-spherical shapes. Then remove the flat circular bottoms of the hemi-spherical shapes that became a pair circular openings 921 and then punch a rectangular through hole 922 in a lateral arcuate wall for connecting a valve stem. You'll see that the repeated punching activities not only cause stripes around the opening 921 which have to dealt with after the finishing of the valve ball, but also causes uneven thickness on the lower arcuate portion. So it produces large rate of unqualified products.
- FIGS. 20 to 24 introduce a further prior art valve ball which is manufactured with roller ramming process.
- This process is punching a flat plate 1 into a hollow cylindrical shaped semi-finished product 2 with flap 3 therearound and remove the flap 3 and the bottom 2001 , then punch the cylindrical shaped semi-finished product into the spherical shape 4 and the punch a rectangular hole 5 in a lateral periphery, a valve ball is therefore finished.
- This process includes two times of cutting action and because the roller ramming product is always coursed uneven arc on the whole body that produce high rate of unqualified products, too.
- the present invention has a main object to provide a manufacturing process to make a valve ball which is manufactured with punching method to rapidly produce a double-layer valve ball in good quality of uniform arc and thickness. Besides, it provides high rate of qualified products and convenient assembly.
- the manufacturing process to make a valve ball of the present invention comprises generally the following steps:
- This process may promote the qualified proportion and suit to mass production.
- FIG. 1 is a sectional view to show a flat circular metallic plate disposed between an upper and a lower molds
- FIG. 2 is a perspective view to show that the plate is punched into a top hat configuration
- FIG. 3 is a sectional view to show that the top hat shaped configuration is put into an upper mold ready to punch by a lower mold
- FIG. 4 is a perspective view to show that the top of the hat is punched into an opening and the brim thereof being punched a rectangular indentation
- FIG. 5 is a sectional view to show that the top hat shaped configuration is put into a lower mold and gets ready to punch by an upper mold
- FIG. 6 is a perspective view to show that the top hat shaped configuration is punched into a hemi-spherical shape including an inner wall in the center,
- FIG. 7 is a sectional view of FIG. 6 .
- FIG. 8 is a perspective view to show that a pair of identical hemi-spherical shapes are combined together by means of welding,
- FIG. 9 is a sectional view of FIG. 8 .
- FIG. 10 is a sectional view to show that the valve ball is polished by a polishing machine
- FIG. 11 is a perspective view to show a finished valve ball of the present invention.
- FIG. 12 is a perspective to show a first prior art valve ball which is manufactured by forging process
- FIG. 13 to 17 are the plane, perspective and sectional views to show a second prior art valve ball which is manufactured by punching process
- FIGS. 18 and 19 are the sectional views to show a third prior art valve ball which is of an improvement of the second prior art valve ball.
- FIG. 20 to 24 are the sectional and perspective view to show a fourth prior art valve ball which is manufactured by roller ramming process.
- the manufacturing process to make a valve ball of the present invention comprises the following steps:
- the crown of the top hat shaped is disposed tightly into a central depression 411 of a lower punch 41 which prevent the working piece from displacement problem. So that the hemi-sphere shapes 10 c are of uniform arc and thickness in order to promote the rate of qualification. Not as the prior art manufacturing processes which use only one piece of flat plate through repeated punching steps that can't avoid the problems of displacement of the working piece and deformation of the products that cause a high rate of unqualified products.
- valve ball 10 d of the present invention except the outer housing, it has a inner passage way 14 d which provides a reinforcement function to cause the valve ball more durable. Further, the previously punched rectangular retaining through hole can prevent the valve ball from deformation.
Abstract
A manufacturing process to make a valve ball includes the following steps: a) prepare a plurality of flat circular metallic plates; b) put the plate one by one into a pair of first molds and is punched into a top hat shaped piece; c) put the top hat shaped pieces individually into a pair of second molds and is punched an opening in the top of the crown and a rectangular indentation in a circumference of the brim; d) put the punched top hat again into a pair of third molds and where is punched into a hemi-spherical shaped piece; e) combine pair by pair of the hemi-spherical shaped pieces together with their rectangular indentations facing each other to form a rectangular retaining through hole, then connected by welding means. So that a qualified valve ball is therefore finished after the conducting of trimming, smoothing and polishing steps.
Description
- The present invention relates to hydro-electric parts and more particularly to a manufacturing process to make a valve ball which has two layers made up with punching method.
- The valve ball is a popular part used in the hydro-electric engineering. The manufacturing process of a prior art valve ball can be categorized of punching, forging and/or roller ramming, etc.,
FIG. 12 shows avalve ball 70 which is made with forging process and has a pair of identical hemi-spherical housings 71 each of which has apassage way 72 in the center. The pair of hemi-spherical housings are connected together by welding means to finish avalve ball 70. Due to that a forging object has to be through a chemical disposal. There must be the residual chemicals remained on the surface of thevalve ball 70 which may harm the human health if it is used in a water supply system. However, most of the producers are now gave up this process. FIGS. 13 to 15 show another priorart valve ball 80 which is made with continuous punching method. So it punches acopper plate 81 at first, then punch theplate 81 into the smallarcuate pieces 81′, and punch again the smallarcuate pieces 81′ into the largecircular pieces 81″ and then punch the largecircular pieces 81″ into the hemi-spherical pieces. Finally, put a pair of the hemi-spherical pieces respectively into an upper and a lower mold to facilitate a welding procedure. A valve ball is therefore accomplished after the polishing of the connection seam. This manufacturing process is somewhat too complicated in comparison with other manufacturing process because it wastes time and is unpractical. - FIGS. 16 to 19 show still another prior art valve ball which also adapts repeated punching process. It punches a piece of plate into a cup shaped
semi-finished product 91 and punch thesemi-finished products 91 with an upper and lower mold into the hemi-spherical shapes. Then remove the flat circular bottoms of the hemi-spherical shapes that became a paircircular openings 921 and then punch a rectangular throughhole 922 in a lateral arcuate wall for connecting a valve stem. You'll see that the repeated punching activities not only cause stripes around the opening 921 which have to dealt with after the finishing of the valve ball, but also causes uneven thickness on the lower arcuate portion. So it produces large rate of unqualified products. - FIGS. 20 to 24 introduce a further prior art valve ball which is manufactured with roller ramming process. This process is punching a
flat plate 1 into a hollow cylindrical shapedsemi-finished product 2 withflap 3 therearound and remove theflap 3 and thebottom 2001, then punch the cylindrical shaped semi-finished product into thespherical shape 4 and the punch arectangular hole 5 in a lateral periphery, a valve ball is therefore finished. This process includes two times of cutting action and because the roller ramming product is always coursed uneven arc on the whole body that produce high rate of unqualified products, too. - The present invention has a main object to provide a manufacturing process to make a valve ball which is manufactured with punching method to rapidly produce a double-layer valve ball in good quality of uniform arc and thickness. Besides, it provides high rate of qualified products and convenient assembly.
- Accordingly, the manufacturing process to make a valve ball of the present invention comprises generally the following steps:
-
- a) prepare pieces of flat circular
metallic plates 10; - b) put the
plates 10 one by one between anupper mold 20 and alower mold 21 in a punching machine and punched theplates 10 into a top hat shaped configuration which includes acrown 11 a and abrim 10 a; - c) punch the top of the crown into a
circular opening 12 b and thebrim 10 a an indentation in a circumference; - d) put the top hat shape inversely in a
depression 411 of anotherlower mold 41 which has around top 412 and anotherupper mold 40 which has a symmetrical ¼ spherical grooves around a central cylindrical post by which the top hat shape is punched into a bowl shaped hemi-sphere 10 c including a bottom, arectangular indentation 13 b and a tubular inner wall (not shown); - e) combine a pair of identical hemi-sphere shapes together with their indentations engaged with each other to form a rectangular retaining through hole;
- f) polish the connection seam and the outer surface of the entire body. A qualified valve ball which has an inner wall, an outer wall in uniform arc and thickness is accomplished.
- a) prepare pieces of flat circular
- This process may promote the qualified proportion and suit to mass production.
- The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings.
-
FIG. 1 is a sectional view to show a flat circular metallic plate disposed between an upper and a lower molds, -
FIG. 2 is a perspective view to show that the plate is punched into a top hat configuration, -
FIG. 3 is a sectional view to show that the top hat shaped configuration is put into an upper mold ready to punch by a lower mold, -
FIG. 4 is a perspective view to show that the top of the hat is punched into an opening and the brim thereof being punched a rectangular indentation, -
FIG. 5 is a sectional view to show that the top hat shaped configuration is put into a lower mold and gets ready to punch by an upper mold, -
FIG. 6 is a perspective view to show that the top hat shaped configuration is punched into a hemi-spherical shape including an inner wall in the center, -
FIG. 7 is a sectional view ofFIG. 6 , -
FIG. 8 is a perspective view to show that a pair of identical hemi-spherical shapes are combined together by means of welding, -
FIG. 9 is a sectional view ofFIG. 8 , -
FIG. 10 is a sectional view to show that the valve ball is polished by a polishing machine, -
FIG. 11 is a perspective view to show a finished valve ball of the present invention, -
FIG. 12 is a perspective to show a first prior art valve ball which is manufactured by forging process, -
FIG. 13 to 17 are the plane, perspective and sectional views to show a second prior art valve ball which is manufactured by punching process, -
FIGS. 18 and 19 are the sectional views to show a third prior art valve ball which is of an improvement of the second prior art valve ball, and -
FIG. 20 to 24 are the sectional and perspective view to show a fourth prior art valve ball which is manufactured by roller ramming process. - With reference to
FIGS. 1 and 2 of the drawings, the manufacturing process to make a valve ball of the present invention comprises the following steps: -
- a) prepare a plurality of flat circular
metallic plates 10; - b) put the
plates 10 one by one between a first upper and alower molds cylindrical depression 201 in the center and the first lower mold has acylindrical punch 211 slidably disposed within the central bore engageable withcylindrical depression 201; - c) the
plate 10 is punched by thepunch 211 and pressed by the upper andlower molds cylindrical crown 11 a and abrim 10 a; - c) put the
crown 11 a of the top hat into acentral bore 31 of a second cylindricalupper mold 30 and punched by acylinder punch 32 of a second lower mold, so that the top of thecrown 11 a becomes acircular opening 12 b and thebrim 10 a becomes 10 b because of arectangular indentation 13 b is formed in a circumference (as shown inFIGS. 3 and 4 ); - e) put the opened
crown 12 b of the top hat shape inversely into alower punch 41 of a third lower mold which has acentral depression 411 engageable with the central post surrounded by ¼circular groove 401 in a thirdupper mold 40, meanwhile, thelower punch 41 has a round top engageable with thegroove 401. When the thirdupper mold 40 is closed to thebrim 10 b of the top hat shape and thepunch 41 strokes upward, so that the top hat shaped becomes a hemi-spherical shape including an opened top and arectangular indentation 13 b in a rim (as shown inFIGS. 5 and 6 ); - f) combine each pair of the identical hemi-
spherical shapes 10 c together and connected by welding means with theirdepressions 13 b engaged with each other to form a rectangular retaining throughhole 13 d capable of engaging with a valve stem and theirinner walls 14 c combined into acylindrical passage way 14 d. Avalve ball 10 d is therefore formed (as shown inFIGS. 7, 8 and 9); - g) trim and smooth the welding seam and conduct a solidification process;
- h) polish the outer surface by sleeving the valve ball on a
rotatable rod 50 and engage the outer surface of the valve to anintrorse surface 61 of a polishing machine. A qualified valve ball is therefore finished after removing the rotatable rod 50 (as shown inFIGS. 10 and 11 ).
- a) prepare a plurality of flat circular
- conclusively, during the step punching the
top hat shape 10 b into a hemi-spherical shape 10 c, the crown of the top hat shaped is disposed tightly into acentral depression 411 of alower punch 41 which prevent the working piece from displacement problem. So that the hemi-sphere shapes 10 c are of uniform arc and thickness in order to promote the rate of qualification. Not as the prior art manufacturing processes which use only one piece of flat plate through repeated punching steps that can't avoid the problems of displacement of the working piece and deformation of the products that cause a high rate of unqualified products. - Although the forging process (as discussed in
FIG. 12 ) can avoid the problems of the displacement and the deformation. But the residual chemical remained in the surface is harmful to human health if the valve ball is used in a water supply system. - The
valve ball 10 d of the present invention, except the outer housing, it has ainner passage way 14 d which provides a reinforcement function to cause the valve ball more durable. Further, the previously punched rectangular retaining through hole can prevent the valve ball from deformation. - Note that the specification relating to the above embodiment should be construed as an exemplary rather than as a limitative of the present invention, with many variations and modifications being readily attainable by a person of average skill in the art without departing from the spirit or scope thereof as defined by the appended claims and their legal equivalents.
Claims (4)
1. A manufacturing process to make a valve ball comprising the following steps:
a) preparing a plurality of flat circular metallic plats;
b) putting said plates one by one between a first upper and lower mold of a punching machine;
c) punch said plate into a top hat shaped pieces which has a crown and a brim;
d) putting said top hat shaped piece into a second upper and lower mold where said crown is punched an opening and said brim is punched a rectangular depression in a circumference;
e) putting said punched top hat shape piece between a third upper and lower mold of a punching maching where said top hat is punched into a hemi-spherical shaped piece which has an opening in top abutting a tubular inner wall an a rectangular indentation in a rim;
f) combining said hemi-spherical shaped pieces pair by pair together to form a semi-finished valve ball and connected by welding means;
g) trimming and smoothing weld seam on said valve ball;
h) polishing outer surface of said valve ball in a polishing machine which has a rotatable rod inserted through a central passage way of said valve ball and an introrse surface engaged with the outer surface of said valve ball;
whereby, a qualified valve ball is finished including an inner passage way between said openings and rectangular retaining through hole in a middle periphery.
2. The manufacturing process as recited in claim 1 , wherein said first upper mold has a cylindrical central depression and said first lower mold has a cylindrical punch slidably disposed within a central bore engageable with the central depression of said first upper mold.
3. The manufacturing process as recited in claim 1 , wherein said second upper mold has a cylindrical central bore engageable with a cylinder punch of a second lower mold thereof;
4. The manufacturing process as recited in claim 1 , wherein said third upper mold has a central post surrounded by a ¼ circular groove and said third lower mold has a cylinder punch slidably disposed in a central bore thereof, said punch has a central depression engageable with the central post and a round top engageable with the groove of said third upper mold.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/852,563 US20050274014A1 (en) | 2004-05-25 | 2004-05-25 | Manufacturing process to make a valve ball |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/852,563 US20050274014A1 (en) | 2004-05-25 | 2004-05-25 | Manufacturing process to make a valve ball |
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US20050274014A1 true US20050274014A1 (en) | 2005-12-15 |
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US10/852,563 Abandoned US20050274014A1 (en) | 2004-05-25 | 2004-05-25 | Manufacturing process to make a valve ball |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102441771A (en) * | 2011-10-18 | 2012-05-09 | 天津国际机械有限公司 | Processing technique of valve parts in ball valve with hard seal structure |
CN104368947A (en) * | 2014-10-30 | 2015-02-25 | 黄勇 | Method for manufacturing ball valve element |
CN107314124A (en) * | 2017-08-31 | 2017-11-03 | 郑州鼎盛新技术有限公司 | A kind of processing method of the compound ball valve core of ceramet |
GB2569128A (en) * | 2017-12-05 | 2019-06-12 | Glenalmond Group Ltd | A valve |
CN112570983A (en) * | 2019-09-27 | 2021-03-30 | 吴宗权 | Method for manufacturing stainless steel tiger feet |
WO2022004962A1 (en) * | 2020-07-01 | 2022-01-06 | (주) 케이투앤 | Valve ball manufacturing method and valve ball manufactured by same method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3447222A (en) * | 1967-05-31 | 1969-06-03 | Dillingham Corp | Method of fabricating gate valve |
US3505718A (en) * | 1968-01-15 | 1970-04-14 | Gen Ind Inc | One-piece sheet metal hollow ball for ball valves |
US3518742A (en) * | 1967-08-30 | 1970-07-07 | Sem Tec Inc | Cavity wall valve balls and a method of manufacturing them |
US5979873A (en) * | 1998-11-16 | 1999-11-09 | Wu; Lei-Jui | Method of making ball valves |
US6471183B2 (en) * | 1998-08-19 | 2002-10-29 | Bogdan Roszkowski | Ball valve |
US20030213125A1 (en) * | 2002-05-20 | 2003-11-20 | Su-Yueh Chiuchang | Ball valve body manufacturing method |
-
2004
- 2004-05-25 US US10/852,563 patent/US20050274014A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3447222A (en) * | 1967-05-31 | 1969-06-03 | Dillingham Corp | Method of fabricating gate valve |
US3518742A (en) * | 1967-08-30 | 1970-07-07 | Sem Tec Inc | Cavity wall valve balls and a method of manufacturing them |
US3505718A (en) * | 1968-01-15 | 1970-04-14 | Gen Ind Inc | One-piece sheet metal hollow ball for ball valves |
US6471183B2 (en) * | 1998-08-19 | 2002-10-29 | Bogdan Roszkowski | Ball valve |
US5979873A (en) * | 1998-11-16 | 1999-11-09 | Wu; Lei-Jui | Method of making ball valves |
US20030213125A1 (en) * | 2002-05-20 | 2003-11-20 | Su-Yueh Chiuchang | Ball valve body manufacturing method |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102441771A (en) * | 2011-10-18 | 2012-05-09 | 天津国际机械有限公司 | Processing technique of valve parts in ball valve with hard seal structure |
CN104368947A (en) * | 2014-10-30 | 2015-02-25 | 黄勇 | Method for manufacturing ball valve element |
CN107314124A (en) * | 2017-08-31 | 2017-11-03 | 郑州鼎盛新技术有限公司 | A kind of processing method of the compound ball valve core of ceramet |
GB2569128A (en) * | 2017-12-05 | 2019-06-12 | Glenalmond Group Ltd | A valve |
GB2569128B (en) * | 2017-12-05 | 2022-02-23 | Glenalmond Group Ltd | A valve |
CN112570983A (en) * | 2019-09-27 | 2021-03-30 | 吴宗权 | Method for manufacturing stainless steel tiger feet |
WO2022004962A1 (en) * | 2020-07-01 | 2022-01-06 | (주) 케이투앤 | Valve ball manufacturing method and valve ball manufactured by same method |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |