CN211315165U - Valve plate positioning pin for welding-free butterfly valve - Google Patents
Valve plate positioning pin for welding-free butterfly valve Download PDFInfo
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- CN211315165U CN211315165U CN201922482622.3U CN201922482622U CN211315165U CN 211315165 U CN211315165 U CN 211315165U CN 201922482622 U CN201922482622 U CN 201922482622U CN 211315165 U CN211315165 U CN 211315165U
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- positioning pin
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- annular groove
- pin body
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Abstract
The utility model discloses a valve plate positioning pin for a welding-free butterfly valve, which comprises a positioning pin body; the method is characterized in that: the mounting direction of the positioning pin is along the direction of water flow, wherein the large-diameter end is a water-facing end; the locating pin body is conical structure, the conicity of locating pin body is 1: 50, an annular groove is arranged at the position which is at least 20mm close to the large-diameter end of the positioning pin body and is not more than half of the length of the positioning pin body, the depth of the annular groove is 5% -7% of the diameter of the positioning pin body at the position of the annular groove, and a sealing ring is arranged in the annular groove. Compared with the traditional welding and sealing structure, the technical scheme has the advantages of good sealing effect, easy disassembly and assembly and the like. And simultaneously, the labor intensity of maintenance personnel during maintenance is reduced.
Description
Technical Field
The utility model belongs to the technical field of the valve, especially, relate to a exempt from to weld valve plate locating pin for butterfly valve suitable for heavy-medium-caliber butterfly valve.
Background
As is well known, a butterfly valve is a regulating valve with a simple structure, and a butterfly valve used for on-off control of low-pressure pipeline media refers to a valve in which a closing member (a valve clack or a butterfly plate) is a disk and rotates around a valve shaft to open and close. Mainly comprises a valve body, a valve rod, a butterfly plate and a sealing ring. The valve body is cylindrical, the axial length is short, a butterfly plate is arranged in the valve cavity of the valve body, the butterfly plate needs to be fixedly connected with a valve rod, the connection mode of the valve body and the valve rod is mainly realized by adopting a positioning pin component at present, namely, a positioning pin hole is correspondingly arranged on the valve rod and a valve rod sleeve of the butterfly plate, then a positioning pin is inserted into the positioning pin hole, the position of the positioning pin hole is leaked due to the fact that the surface precision of the positioning pin and the positioning pin hole is not good during actual construction, particularly, a large-diameter butterfly valve and a medium-diameter butterfly valve which are larger than DN350 are particularly formed, and a; the problem of leakage at the positioning pin of the large and medium-diameter butterfly valve is generally solved by adopting the following two modes: firstly, the processing precision of the positioning pin hole and the positioning pin is improved, so that the processing cost is greatly increased; secondly, sealing welding is carried out at two ends of the positioning pin, please refer to fig. 3, the cost is relatively low compared with the improvement of the processing precision, and because the sealing ring between the valve plate and the valve body belongs to a quick-wear part, the valve plate needs to be replaced when the wear sealing fails, and the valve plate needs to be taken out from the valve cavity when the valve plate is replaced; if a welding sealing structure is adopted, the welding on the positioning pin and the valve rod sleeve is needed to be ground, and then the valve plate can be detached; due to the limitation of the valve cavity space of the valve body, the labor intensity of maintenance personnel is high during maintenance; generally, 2-4 positioning pins are needed to be connected with the valve rod from top to bottom of the valve plate of each butterfly valve, so that the maintenance efficiency of maintenance personnel is relatively low.
Therefore, the utility model provides an above-mentioned technical problem, provide an easily installation and dismantle, sealed effectual, the firm welding-free valve plate locating pin for butterfly valve of installation.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides an easily install with dismantle, sealed effectual, install firm exempt from to weld valve plate locating pin for butterfly valve.
The utility model is realized in such a way that the valve plate positioning pin for the welding-free butterfly valve comprises a positioning pin body; the method is characterized in that: the mounting direction of the positioning pin is along the direction of water flow, wherein the large-diameter end is a water-facing end; the locating pin body is conical structure, the conicity of locating pin body is 1: 50, an annular groove is arranged at a position which is at least 20mm close to the large-diameter end of the positioning pin body and is not more than half of the length of the positioning pin body; the depth of the annular groove is 5% -7% of the diameter of the positioning pin body at the position of the annular groove, and a sealing ring is arranged in the annular groove.
Preferably, in the above technical solution, the cross section of the annular groove is formed in a U shape, a rectangular shape, a trapezoidal shape, or a V shape.
Preferably, the rough Ra of the outer surface of the positioning pin is not higher than 3.2 μm.
The utility model has the advantages and positive effect: the utility model adopts the above technical scheme and traditional welded seal structure compare have sealed effectual, easily dismantle advantages such as installation. And simultaneously, the labor intensity of maintenance personnel during maintenance is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a view showing the usage state of the present invention;
fig. 3 is a schematic diagram of a prior art structure.
Fig. 1, locating pin body; 1-1, an annular groove; 2. a sealing ring 3 and a valve rod; 4. a valve plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2, the present invention provides a valve plate positioning pin for a welding-free butterfly valve, which comprises a positioning pin body 1; the mounting direction of the positioning pin is along the direction of water flow, wherein the large-diameter end is a water-facing end; the locating pin body is conical structure, the conicity of locating pin body is 1: 50, the taper is adopted to be in sealing fit with the taper holes in the valve rod 3 and the valve plate 4, an annular groove 1-1 is arranged at a position which is at least 20mm close to the large-diameter end of the positioning pin body and is not more than half of the length of the positioning pin body, the position of the annular groove is not too short, the sealing effect of the annular groove is influenced, the depth of the annular groove is 5% -7% of the diameter of the positioning pin body at the position of the annular groove, the annular groove is not too deep, and the strength of the positioning pin body is influenced by the too; and a sealing ring is arranged in the annular groove, and the sealing ring and the butterfly plate are sealed by deformation to prevent a medium from leaking from the taper pin hole.
Preferably, in the above technical solution, the cross section of the annular groove is formed in a U shape, a rectangular shape, a trapezoidal shape, or a V shape.
Preferably, the rough Ra of the outer surface of the positioning pin is not higher than 3.2 μm.
By adopting the technical scheme, the cost is relatively low compared with the mode of improving the processing precision by sealing and welding the two ends of the positioning pin in the prior art; because the sealing ring between the valve plate and the valve body belongs to a quick-wear part, the valve plate needs to be replaced when the wear sealing fails, and then the valve plate needs to be taken out from the valve cavity when the valve plate is replaced; by adopting the technical scheme of the utility model, the valve plate can be disassembled only by applying a certain acting force on the small-diameter end without adopting cutting equipment or grinding equipment for grinding, and then the valve plate can be disassembled; the labor intensity of maintenance personnel during maintenance is greatly reduced; the maintenance efficiency is improved.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A valve plate positioning pin for a welding-free butterfly valve comprises a positioning pin body; the method is characterized in that: the mounting direction of the positioning pin is along the direction of water flow, wherein the large-diameter end is a water-facing end; the locating pin body is conical structure, the conicity of locating pin body is 1: 50, an annular groove is arranged at the position which is at least 20mm close to the large-diameter end of the positioning pin body and is not more than half of the length of the positioning pin body, the depth of the annular groove is 5% -7% of the diameter of the positioning pin body at the position of the annular groove, and a sealing ring is arranged in the annular groove.
2. The welding-free valve plate positioning pin for the butterfly valve according to claim 1, wherein: the section of the annular groove is formed into a U shape, a rectangular shape, a trapezoidal shape or a V shape.
3. The welding-free valve plate positioning pin for the butterfly valve according to claim 1, wherein: the roughness Ra of the outer surface of the positioning pin is not higher than 3.2 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922482622.3U CN211315165U (en) | 2019-12-31 | 2019-12-31 | Valve plate positioning pin for welding-free butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922482622.3U CN211315165U (en) | 2019-12-31 | 2019-12-31 | Valve plate positioning pin for welding-free butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211315165U true CN211315165U (en) | 2020-08-21 |
Family
ID=72075905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922482622.3U Active CN211315165U (en) | 2019-12-31 | 2019-12-31 | Valve plate positioning pin for welding-free butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211315165U (en) |
-
2019
- 2019-12-31 CN CN201922482622.3U patent/CN211315165U/en active Active
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