CN205207737U - Fixed ball valve valve rod of metal seal and centering shaft connection structure - Google Patents
Fixed ball valve valve rod of metal seal and centering shaft connection structure Download PDFInfo
- Publication number
- CN205207737U CN205207737U CN201520839543.2U CN201520839543U CN205207737U CN 205207737 U CN205207737 U CN 205207737U CN 201520839543 U CN201520839543 U CN 201520839543U CN 205207737 U CN205207737 U CN 205207737U
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- CN
- China
- Prior art keywords
- spheroid
- valve rod
- centration axis
- valve
- centering shaft
- 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.)
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- Sealing Devices (AREA)
Abstract
The utility model relates to a fixed ball valve valve rod of metal seal and centering shaft connection structure, including centering shaft, the spheroid, seal cover and valve rod, spheroid top and below are equipped with square shrinkage pool and circular concave hole respectively, the circular concave hole phase -match of centering shaft and spheroid below, and insert the circular concave hole of spheroid below, the square shrinkage pool phase -match of valve rod lower extreme and spheroid top, and pass the seal cover and insert the square shrinkage pool above the spheroid, the seal cover is the hollow cylinder structure, set up the thrust pad between centering shaft top and the spheroid, centering shaft and spheroid contact surface build -up welding abrasion -resistant alloy, valve rod and seal cover contact surface build -up welding abrasion -resistant alloy. The utility model discloses reduce frictional force between valve rod, centering shaft and the spheroid, reduced the moment of torsion the when valve is opened and close to the life of valve has been prolonged.
Description
Technical field
The utility model belongs to metal sealing fixing ball valve technical field, particularly a kind of metal sealing fixing ball valve valve rod and centration axis linkage structure.
Background technique
The working principle of metal sealing fixing ball valve is by centration axis supporting sephere, then drives spheroid to do 90 ° of rotations to reach the object of switch by valve rod.Metal sealing fixing ball valve valve rod before a kind of improvement as shown in Figure 2 and centration axis linkage structure, its spheroid directly contacts with centration axis, valve rod and stuffing box gland axle sleeve coordinate, valve is in running, centration axis and spheroid, between valve rod and stuffing box gland, frictional force is large, long-time switch may cause contact surface abrasion, thus moment of torsion when increasing unlatching (closedown) of valve, to such an extent as to valve damages until scrap.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of metal sealing fixing ball valve valve rod and centration axis linkage structure, reduces valve rod, frictional force between centration axis and spheroid, reduces valve opening and closing moment of torsion, extends valve working life.
The utility model solves the technological scheme that its technical problem adopts and is to provide a kind of metal sealing fixing ball valve valve rod and centration axis linkage structure, comprise centration axis, spheroid, stuffing box gland and valve rod, square shrinkage pool and circular shrinkage hole is respectively equipped with above and below described spheroid, circular shrinkage hole below described centration axis and spheroid matches, and the circular shrinkage hole inserted below spheroid, square shrinkage pool above described valve rod lower end and spheroid matches, and insert the square shrinkage pool above spheroid through stuffing box gland, described stuffing box gland is hollow cylindrical structure, between described centration axis top and spheroid, thrust pad is set, described centration axis and spheroid contact surface build-up wear-resistant alloy, described valve rod and stuffing box gland contact surface build-up wear-resistant alloy.
Described abrasion resistance alloy is Si Taili cemented carbide.
The built-up welding thickness of described Si Taili cemented carbide is not less than 1mm.
Described thrust pad is made up of 304 nitrided stainless steels.
Beneficial effect
The utility model arranges thrust pad between centration axis top and spheroid, and to avoid between centration axis with spheroid direct contacts, and is conducive to reducing wear; By at centration axis and spheroid, valve rod and stuffing box gland contact surface build-up wear-resistant alloy, reduce valve centration axis and spheroid, frictional force between valve rod and seal ring in opening-closing process, reduce wearing and tearing, reduce the moment of torsion of valve opening and closing, extend the working life of valve.
Accompanying drawing explanation
Fig. 1 is the linkage structure schematic diagram of the utility model centration axis and valve rod.
Fig. 2 is the linkage structure schematic diagram of centration axis and valve rod before improving.
Embodiment
Below in conjunction with specific embodiment, set forth the utility model further.Should be understood that these embodiments are only not used in restriction scope of the present utility model for illustration of the utility model.In addition should be understood that those skilled in the art can make various changes or modifications the utility model, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the utility model instruction.
A kind of metal sealing fixing ball valve valve rod as shown in Figure 1 and centration axis linkage structure, comprise centration axis 1, spheroid 3, stuffing box gland 4 and valve rod 5.Be respectively equipped with square shrinkage pool and circular shrinkage hole above and below spheroid 3, centration axis 1 matches with the circular shrinkage hole below spheroid 3 and inserts the circular shrinkage hole below spheroid 3, and play the effect in fixing spheroid 3 axle center, spheroid 3 can rotate along centration axis 1.Be provided with a thrust pad 2 between centration axis 1 top and spheroid 3, this thrust pad 2 is made up of 304 nitrided stainless steels, thus avoids centration axis 1 top directly to contact with spheroid 3, is conducive to reducing wear.
Square shrinkage pool above valve rod 5 lower end and spheroid 3 matches and passes stuffing box gland 4 and inserts square shrinkage pool above spheroid 3, and stuffing box gland 4 is hollow cylindrical structure.Spheroid 3 can realize the keying of valve along with the rotation of valve rod 5, valve rod 5 also exists relatively rotating in rotation process and between stuffing box gland 4.
In order to the contact surface and valve rod 5 and stuffing box gland 4 that reduce valve centration axis 1 and spheroid 3 in opening-closing process contact surface between frictional force, at surface overlaying one deck abrasion resistance alloy that centration axis 1 contacts with stuffing box gland 4 with spheroid 3, valve rod 5, this abrasion resistance alloy can select Si Taili cemented carbide, and the thickness of built-up welding is not less than 1mm.
Claims (4)
1. a metal sealing fixing ball valve valve rod and centration axis linkage structure, comprise centration axis (1), spheroid (3), stuffing box gland (4) and valve rod (5), described spheroid is respectively equipped with square shrinkage pool and circular shrinkage hole above and below (3), described centration axis (1) matches with the circular shrinkage hole of spheroid (3) below, and insert the circular shrinkage hole of spheroid (3) below, the square shrinkage pool of described valve rod (5) lower end and spheroid (3) top matches, and the square shrinkage pool of spheroid (3) top is inserted through stuffing box gland (4), described stuffing box gland (4) is hollow cylindrical structure, it is characterized in that: thrust pad (2) is set between described centration axis (1) top and spheroid (3), described centration axis (1) and spheroid (3) contact surface build-up wear-resistant alloy, described valve rod (5) and stuffing box gland (4) contact surface build-up wear-resistant alloy.
2. a kind of metal sealing fixing ball valve valve rod according to claim 1 and centration axis linkage structure, is characterized in that: described abrasion resistance alloy is Si Taili cemented carbide.
3. a kind of metal sealing fixing ball valve valve rod according to claim 2 and centration axis linkage structure, is characterized in that: the built-up welding thickness of described Si Taili cemented carbide is not less than 1mm.
4. a kind of metal sealing fixing ball valve valve rod according to claim 1 and centration axis linkage structure, is characterized in that: described thrust pad is made up of 304 nitrided stainless steels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520839543.2U CN205207737U (en) | 2015-10-27 | 2015-10-27 | Fixed ball valve valve rod of metal seal and centering shaft connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520839543.2U CN205207737U (en) | 2015-10-27 | 2015-10-27 | Fixed ball valve valve rod of metal seal and centering shaft connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205207737U true CN205207737U (en) | 2016-05-04 |
Family
ID=55845455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520839543.2U Active CN205207737U (en) | 2015-10-27 | 2015-10-27 | Fixed ball valve valve rod of metal seal and centering shaft connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205207737U (en) |
-
2015
- 2015-10-27 CN CN201520839543.2U patent/CN205207737U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |