CA1103646A - Housing for gate valves - Google Patents
Housing for gate valvesInfo
- Publication number
- CA1103646A CA1103646A CA342,279A CA342279A CA1103646A CA 1103646 A CA1103646 A CA 1103646A CA 342279 A CA342279 A CA 342279A CA 1103646 A CA1103646 A CA 1103646A
- Authority
- CA
- Canada
- Prior art keywords
- housing
- section
- halves
- gate
- lower section
- 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.)
- Expired
Links
- 238000005242 forging Methods 0.000 claims description 9
- 238000003754 machining Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000010959 steel 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/10—Welded housings
- F16K27/105—Welded housings for gate 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/044—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members
- F16K27/047—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members with wedge-shaped obturating members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve Housings (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Forging (AREA)
- Lift Valve (AREA)
Abstract
1957-39a ABSTRACT OF THE DISCLOSURE
The housing of a gate valve has a forged lower section and a forged bonnet. The lower section has two halves which are mirror symmetrical to each other with reference to the central plane of the gate and are bonded to each other by a circular welded seam. A circular or oval welded seam connects the lower section to the bonnet, and the lower section has a guide groove for the gate. The groove is bounded by two surfaces forming part of circular surfaces whose centers are located on an axis including the center of curvature of the seam between the two halves of the lower section. This simplifies the machining and assembly of the lower section because the surfaces bounding the guide groove can be machined simultaneously with the edge faces bounding the seam between the halves of the lower section.
The housing of a gate valve has a forged lower section and a forged bonnet. The lower section has two halves which are mirror symmetrical to each other with reference to the central plane of the gate and are bonded to each other by a circular welded seam. A circular or oval welded seam connects the lower section to the bonnet, and the lower section has a guide groove for the gate. The groove is bounded by two surfaces forming part of circular surfaces whose centers are located on an axis including the center of curvature of the seam between the two halves of the lower section. This simplifies the machining and assembly of the lower section because the surfaces bounding the guide groove can be machined simultaneously with the edge faces bounding the seam between the halves of the lower section.
Description
1~03646 The present invention relates to valves in general, and more particularly to i~provements in bodies or housings for shutoff valves. Still more particularly, the invention relates to improvements in housings for shutoff valves, especially gate valves, wherein sections which preferably constitute forgings are bonded to each other by welded seams.
It is already known to assemble the housing for a gate valve of several sections which are produced by forging and are assembled in part by resorting to a welding technique. For example, the housing may comprise an upper section or bonnet and a lower section which is assembled of two substantially mirror symmetrical halves. The two halves are welded to each other, and the two sections are riveted or bolted to each other. The seam of weldant which connects the two halves of the lower section is located in the central plane of the reciprocable gate. The bonnet accommodates the customary components of the gate valve. The tubular portions of the lower section are made by forging and serve to connect the housing with the adjacent portions of a pipeline~ Reference may be had to German Utility Model No. 1,706,081 wherein the lower section has a top flange which can be attached to the lower end of the bonnet.
German Patent No. 1,114,683 discloses a modified valve housing which exhibits the advantage that its component parts can be more readily welded to each other, i.e., that such parts can be more readily welded in existing machines. However, the patented housing is not a forging but rather a body which is assembled and made almost exclusively by welding.
A drawback of the above outlined conventional housings is that they lack adequate guide means for the gate. As a rule, or at least in many gate valves, the gate is guided exclusively ``` 1~03646 by the bonnet which is undesirable in many instances because the stem or spindle for the gate is subjected to excessive stresses. It is also known to subject an assembled valve housing to a secondary treatment which involves the installation of guide means for the gate in the lower section of the housing.
In many instances, the subsequently installed guide means includes strips which are secured to the lower section by welding.
This involves additional expenses and is likely to lead to inaccuracies which can be eliminated by resorting to a further treatment, e.g., to removal of material in a lathe, a milling machine ox a turning machine.
In accordance with the invention, those portions of the halves of the lower section of the valve body or housing which are adjacent to the welded seam have a circular outline, and the surfaces bounding the guide groove for the gate are integrated into the halves of the lower section. Such surfaces are portions of circular surfaces whose centers are located on an axis 'including the center of curvature of the seam. The just defined construction exhibits the important advantage that the problem of properly guiding the gate in the interior of the lower section of the valve housing is solved in a simple, reliable and inexpensive manner. The halves of the lower section of the housing preferably constitute forgings, and the lower section is preferabl~ welded to the other section or bonnet of the housing.
The novel features which are considered as characteristic of the invention are set forth in particular in the appended claims. The improved valve housing itself, however, both as to its construction and the mode of assembling the same, together with additional features and advantages thereof, will 1~1)3646 be best understood upon perusal of the following detailed description of certain specific embodiments with reference to the accompanying drawing.
Figure 1 is a fragmentary axial sectional view of a valve housing which embodies the invention, a portion of the bonnet being indicated by phantom lines;
Figure 2 is a horizontal sectional view as seen in the direction of arrows from the line II-II of Figure l; and Figure 3 is a sectional view as seen in the direction of arrows from the line III-III of Figure 1.
The drawing shows the housing of a shutoff valve, namely, of a gate valve having a lower section which is assembled of two mirror symmetrical halves 1, 2 and an upper section or bonnet 10 a portion of which is denoted by phantom lines (see Figures 1 and 3). The bonnet 10 and the halves 1, ~ are steel forgings. A first welded seam 3 permanently connects the halves 1, 2 to each other, and a second welded seam 11 connects the circular or oval upper end face of the lower section to the complementary underside of the bonnet 10.
The halves 1 and 2 of the lower section of the valve housing have finished surfaces 4 and 5 which define the seat for the gate, not shown. Furthermore, the halves 1, 2 have finished surfaces 6, 7 defining a guide groove 12 for the wedge gate, not shown. The tubular portions 8, 9 of the halves 1, 2 can be connected with the adjacent components of a pipe line, not shown.
FIG. 2 shows that the planes of the surfaces 6, 7 bounding the guide groove 12 are offset relative to and flank the plane of the seam 3. These planes may be parallel to each other, or the planes of the surfaces 6, 7 can be mirror 1~13646 symmetrical to each other with reference to the plane of the seam 3, depending on the design of the gate.
Referring to FIG. 3, it will be seen that the center of curvature 3A of the circular seam 3 is located on an axis which extends at right angles to the plane of the drawing. The surfaces 6 and 7 constitute portions of circular surfaces whose centers are also located on the just mentioned axis. This simplifies the manufacture and reduces the cost of the housing.
The axis passing through the center of curvature 3A is parallel to the common axis of the tubular portions 8 and 9. Those portions of the halves 1 and 2 which are adjacent to the seam 3 have a circular outline and the seam 3 has a substantially triangular cross-sectional configuration.
The improved valve housing exhibits the aforementioned advantage that the gate can be properly guided in the lower section of the housing. The guide means includes the groove 12, and more particularly the surfaces 6 and 7 which flank the ` groove. The centers of circular surfaces which include the- surfaces 6 and 7 are located on the axis which also includes the center of curvature of the seam 3. This greatly reduces the manufacturing cost of the section including the halves 1 and 2.
Another advantage of the improved housing is that the surfaces 6, 7 can be formed by forging simultaneously with forging of the surfaces 4 and 5, i.e., with the finishing of the seat for the gate which latter is preferably but need not necessarily be a wedge~ This renders it possible to finish the edge faces for the seam 3 and the surfaces 6, 7 (and also the surfaces 4, 5) during a single insertion into a turning or another suitable finishing machine. Moreover, such treatment can be carried out by resorting to a relatively simple and A
36~
inexpensive machine. The same holds true for the machine which is used to make the seam 11 and/or 3. The section including the halves 1 and 2 is ready for attachment to the section or bonnet 10 as soon as the making of the seam 3 is completed, i.e., there is no need for aftertreatment or secondary treatment of the interior of the lower section subsequent to bonding of the halves 1 and 2 to each other.
Still another advantage of the improved housing is that the guide means (6, 7, 12) for the gate is located in the interior of the lower section. This reduces the stresses upon the gate and its spindle or stem. Also, the stresses which are applied to the gate can be transmitted directly to the housing, i.e., along the shortest path possible.
All of the aforementioned advantages are attributable to the features which are characteristic of the improved valve housing and which can be achieved without any further treatment and/or without resort to any additional apparatus, units or devices.
It is already known to assemble the housing for a gate valve of several sections which are produced by forging and are assembled in part by resorting to a welding technique. For example, the housing may comprise an upper section or bonnet and a lower section which is assembled of two substantially mirror symmetrical halves. The two halves are welded to each other, and the two sections are riveted or bolted to each other. The seam of weldant which connects the two halves of the lower section is located in the central plane of the reciprocable gate. The bonnet accommodates the customary components of the gate valve. The tubular portions of the lower section are made by forging and serve to connect the housing with the adjacent portions of a pipeline~ Reference may be had to German Utility Model No. 1,706,081 wherein the lower section has a top flange which can be attached to the lower end of the bonnet.
German Patent No. 1,114,683 discloses a modified valve housing which exhibits the advantage that its component parts can be more readily welded to each other, i.e., that such parts can be more readily welded in existing machines. However, the patented housing is not a forging but rather a body which is assembled and made almost exclusively by welding.
A drawback of the above outlined conventional housings is that they lack adequate guide means for the gate. As a rule, or at least in many gate valves, the gate is guided exclusively ``` 1~03646 by the bonnet which is undesirable in many instances because the stem or spindle for the gate is subjected to excessive stresses. It is also known to subject an assembled valve housing to a secondary treatment which involves the installation of guide means for the gate in the lower section of the housing.
In many instances, the subsequently installed guide means includes strips which are secured to the lower section by welding.
This involves additional expenses and is likely to lead to inaccuracies which can be eliminated by resorting to a further treatment, e.g., to removal of material in a lathe, a milling machine ox a turning machine.
In accordance with the invention, those portions of the halves of the lower section of the valve body or housing which are adjacent to the welded seam have a circular outline, and the surfaces bounding the guide groove for the gate are integrated into the halves of the lower section. Such surfaces are portions of circular surfaces whose centers are located on an axis 'including the center of curvature of the seam. The just defined construction exhibits the important advantage that the problem of properly guiding the gate in the interior of the lower section of the valve housing is solved in a simple, reliable and inexpensive manner. The halves of the lower section of the housing preferably constitute forgings, and the lower section is preferabl~ welded to the other section or bonnet of the housing.
The novel features which are considered as characteristic of the invention are set forth in particular in the appended claims. The improved valve housing itself, however, both as to its construction and the mode of assembling the same, together with additional features and advantages thereof, will 1~1)3646 be best understood upon perusal of the following detailed description of certain specific embodiments with reference to the accompanying drawing.
Figure 1 is a fragmentary axial sectional view of a valve housing which embodies the invention, a portion of the bonnet being indicated by phantom lines;
Figure 2 is a horizontal sectional view as seen in the direction of arrows from the line II-II of Figure l; and Figure 3 is a sectional view as seen in the direction of arrows from the line III-III of Figure 1.
The drawing shows the housing of a shutoff valve, namely, of a gate valve having a lower section which is assembled of two mirror symmetrical halves 1, 2 and an upper section or bonnet 10 a portion of which is denoted by phantom lines (see Figures 1 and 3). The bonnet 10 and the halves 1, ~ are steel forgings. A first welded seam 3 permanently connects the halves 1, 2 to each other, and a second welded seam 11 connects the circular or oval upper end face of the lower section to the complementary underside of the bonnet 10.
The halves 1 and 2 of the lower section of the valve housing have finished surfaces 4 and 5 which define the seat for the gate, not shown. Furthermore, the halves 1, 2 have finished surfaces 6, 7 defining a guide groove 12 for the wedge gate, not shown. The tubular portions 8, 9 of the halves 1, 2 can be connected with the adjacent components of a pipe line, not shown.
FIG. 2 shows that the planes of the surfaces 6, 7 bounding the guide groove 12 are offset relative to and flank the plane of the seam 3. These planes may be parallel to each other, or the planes of the surfaces 6, 7 can be mirror 1~13646 symmetrical to each other with reference to the plane of the seam 3, depending on the design of the gate.
Referring to FIG. 3, it will be seen that the center of curvature 3A of the circular seam 3 is located on an axis which extends at right angles to the plane of the drawing. The surfaces 6 and 7 constitute portions of circular surfaces whose centers are also located on the just mentioned axis. This simplifies the manufacture and reduces the cost of the housing.
The axis passing through the center of curvature 3A is parallel to the common axis of the tubular portions 8 and 9. Those portions of the halves 1 and 2 which are adjacent to the seam 3 have a circular outline and the seam 3 has a substantially triangular cross-sectional configuration.
The improved valve housing exhibits the aforementioned advantage that the gate can be properly guided in the lower section of the housing. The guide means includes the groove 12, and more particularly the surfaces 6 and 7 which flank the ` groove. The centers of circular surfaces which include the- surfaces 6 and 7 are located on the axis which also includes the center of curvature of the seam 3. This greatly reduces the manufacturing cost of the section including the halves 1 and 2.
Another advantage of the improved housing is that the surfaces 6, 7 can be formed by forging simultaneously with forging of the surfaces 4 and 5, i.e., with the finishing of the seat for the gate which latter is preferably but need not necessarily be a wedge~ This renders it possible to finish the edge faces for the seam 3 and the surfaces 6, 7 (and also the surfaces 4, 5) during a single insertion into a turning or another suitable finishing machine. Moreover, such treatment can be carried out by resorting to a relatively simple and A
36~
inexpensive machine. The same holds true for the machine which is used to make the seam 11 and/or 3. The section including the halves 1 and 2 is ready for attachment to the section or bonnet 10 as soon as the making of the seam 3 is completed, i.e., there is no need for aftertreatment or secondary treatment of the interior of the lower section subsequent to bonding of the halves 1 and 2 to each other.
Still another advantage of the improved housing is that the guide means (6, 7, 12) for the gate is located in the interior of the lower section. This reduces the stresses upon the gate and its spindle or stem. Also, the stresses which are applied to the gate can be transmitted directly to the housing, i.e., along the shortest path possible.
All of the aforementioned advantages are attributable to the features which are characteristic of the improved valve housing and which can be achieved without any further treatment and/or without resort to any additional apparatus, units or devices.
Claims (10)
1. A housing for a sate valve, comprising a first section and a second section, said first section having two halves which are mirror symmetrical to each other with reference to the central plane of the gate and said first section further having an internal guide groove for the gate, said guide groove being bounded by two surfaces forming part of circular surfaces and the first section further having a circular welded seam connecting said halves to each other, the center of curvature of said seam and the centers of said circular surfaces being located on a common axis.
2. The housing of claim 1, wherein said halves of the first section are forgings.
3. The housing of claim 2, wherein said halves have coaxial tubular portions.
4. The housing of claim 2, wherein the surfaces bounding said groove are inclined relative to and mirror symmetrical to each other with reference to the central plane of the gate.
5. The housing of claim 2, wherein that portion of the first section which is adjacent to the circular seam has a substantially circular cross-sectional outline.
6. The housing of claim 2, wherein said first section has a pair of additional surfaces which are outwardly adjacent to the surfaces bounding said groove and define a seat for the gate.
7. The housing of claim 1, wherein said first section is the lower section of the housing and said second section is a bonnet.
8. The housing of claim 7, further comprising a circular or oval second welded seam connecting said first and second sections.
9. The housing of claim 1, wherein said halves have coaxial tubular portions and the common axis of such tubular portions is parallel to said first mentioned axis.
10. The housing of claim 1, wherein said seam has a substantially triangular cross-sectional outline.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2855034.7 | 1978-12-20 | ||
| DE2855034A DE2855034C2 (en) | 1978-12-20 | 1978-12-20 | Valve housing for gate valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1103646A true CA1103646A (en) | 1981-06-23 |
Family
ID=6057765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA342,279A Expired CA1103646A (en) | 1978-12-20 | 1979-12-19 | Housing for gate valves |
Country Status (8)
| Country | Link |
|---|---|
| CA (1) | CA1103646A (en) |
| CH (1) | CH643929A5 (en) |
| DD (1) | DD148091A5 (en) |
| DE (1) | DE2855034C2 (en) |
| FR (1) | FR2444875A1 (en) |
| GB (1) | GB2037954B (en) |
| IT (1) | IT1127724B (en) |
| SE (1) | SE438543B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3244020A1 (en) * | 1982-11-27 | 1984-05-30 | Walter 4788 Warstein Siepmann | SHUT-OFF VALVE |
| US4588164A (en) * | 1983-05-11 | 1986-05-13 | Kemp Willard E | Through conduit gate valve |
| CN110805732B (en) * | 2019-11-21 | 2024-06-04 | 替科斯科技集团丽水流体设备有限公司 | Production process of all-welded ball valve |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2065035A (en) * | 1935-04-22 | 1936-12-22 | Taylor James Hall | Valve housing and method of making same |
| GB569833A (en) * | 1943-10-07 | 1945-06-11 | Bolton S Superheater & Pipewor | Improvements relating to the manufacture of valves for the control of fluids |
| DE1706081U (en) * | 1950-04-21 | 1955-09-01 | Siepmann Werke Ag | COUNTER-FORGED HOUSING PART FOR VALVE HOUSING. |
| NL160643C (en) * | 1969-11-05 | 1979-11-15 | Holland Bergen Machine | SLIDE VALVE. |
| DE2164929B2 (en) * | 1971-12-28 | 1976-01-02 | Preussag Ag, 3000 Hannover U. 1000 Berlin | Composite welded gate valve housing - has pressed and machined components seam welded to form housing |
| DE2725799C2 (en) * | 1977-06-08 | 1982-10-07 | Kreuz, geb. von Pidoll, Hildegard, 4050 Mönchengladbach | Valve housing blank |
-
1978
- 1978-12-20 DE DE2855034A patent/DE2855034C2/en not_active Expired
-
1979
- 1979-11-22 SE SE7909643A patent/SE438543B/en not_active IP Right Cessation
- 1979-11-27 CH CH1054579A patent/CH643929A5/en not_active IP Right Cessation
- 1979-11-29 FR FR7929412A patent/FR2444875A1/en active Granted
- 1979-12-17 IT IT28063/79A patent/IT1127724B/en active
- 1979-12-17 DD DD79217766A patent/DD148091A5/en unknown
- 1979-12-18 GB GB7943511A patent/GB2037954B/en not_active Expired
- 1979-12-19 CA CA342,279A patent/CA1103646A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2444875A1 (en) | 1980-07-18 |
| DE2855034A1 (en) | 1980-07-10 |
| FR2444875B1 (en) | 1984-10-19 |
| SE7909643L (en) | 1980-06-21 |
| SE438543B (en) | 1985-04-22 |
| GB2037954A (en) | 1980-07-16 |
| IT1127724B (en) | 1986-05-21 |
| IT7928063A0 (en) | 1979-12-17 |
| CH643929A5 (en) | 1984-06-29 |
| GB2037954B (en) | 1983-02-16 |
| DE2855034C2 (en) | 1985-11-21 |
| DD148091A5 (en) | 1981-05-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |