CN214748709U - Device for checking tightness of valve seat of safety valve - Google Patents
Device for checking tightness of valve seat of safety valve Download PDFInfo
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- CN214748709U CN214748709U CN202120553555.4U CN202120553555U CN214748709U CN 214748709 U CN214748709 U CN 214748709U CN 202120553555 U CN202120553555 U CN 202120553555U CN 214748709 U CN214748709 U CN 214748709U
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Abstract
The device belongs to the field of machinery, and in particular relates to a device for checking the tightness of a safety valve seat. The main steam safety valve is formed by welding key sensitive equipment (SPV) of a nuclear power plant on a super pipeline, the sealing performance of a sealing surface of a valve seat cannot be verified, the sealing performance can only be verified after the valve seat is started, and due to the fact that the main line works, major repair plans are seriously frustrated, and huge economic loss is caused. The device comprises an adjusting bolt, a spring, an air pipe, a false valve core and a valve cover plate; the adjusting bolt is installed on the valve cover plate, the spring is located under the adjusting bolt, the valve cover plate covers the false valve core, and the air pipe penetrates through the valve cover plate and the false valve core. The sealing online inspection device is simple and convenient to operate, wide in application range, simple and reliable in structure, high in working efficiency and low in manufacturing and using cost, the sealing performance of the valve seat sealing surface of the main steam safety valve is verified in advance, and the conditions that leakage and even a unit retreats from a state and the like caused by unreliable sealing of the valve seat after starting are avoided.
Description
Technical Field
The device belongs to the field of machinery, and in particular relates to a device for checking the tightness of a safety valve seat.
Background
The main steam safety valve is a nuclear power plant key sensitive equipment (SPV), which is a two-circuit pressure boundary. Because the safety valve is welded on a super pipeline, the tightness of the sealing surface of the valve seat cannot be verified, and the safety valve can only be verified after starting the machine, if leakage occurs, the safety valve has to be in a retreated state for disassembly and maintenance, and due to the fact that mainline work is adopted, major repair plans are seriously frustrated, and huge economic loss is caused. The main steam safety valve of domestic nuclear power is mostly the same product of France GRISS, and by now, the total installation quantity reaches 672 platforms, all has the problem that the disk seat leakproofness can not be inspected and confirmed in advance.
In order to solve the problems, the device for online inspection of the sealing surface of the valve seat of the safety valve is urgently needed to be developed so as to inspect and confirm the inspection quality of the sealing surface in advance and avoid economic loss caused by the state rollback of a unit.
Disclosure of Invention
1. The purpose is as follows:
the device for the online inspection of the sealing surface of the valve seat of the safety valve, which is simple and convenient to operate and widely used, is designed, and the maintenance quality of the sealing surface is improved.
2. The technical scheme is as follows:
a device for checking the tightness of a safety valve seat comprises an adjusting bolt, a spring, an air pipe, a false valve core and a valve cover plate; the adjusting bolt is installed on the valve cover plate, the spring is located under the adjusting bolt, the valve cover plate covers the false valve core, and the air pipe penetrates through the valve cover plate and the false valve core.
The plane of the upper part of the false valve core is provided with a bulge, the spring is wound on the bulge part of the false valve core, and the height of the spring exceeds the height of the bulge part in a natural state.
Two ends of the false valve core are provided with screws which penetrate through the false valve core, and the height of the false valve core is adjusted by the screws.
The other end of the screw rod is fixed on the bottom end, and an O-shaped sealing ring and a valve cavity sealing plug are fixedly surrounded on the bottom end.
The valve cover plate is in an inner buckle cover shape, and the inner structure is hollow.
The lower part of the false valve core is in a water drop shape.
The length of two ends of the false valve core is the same as the length of the inside of the valve cover plate.
3. The effect is as follows:
the sealing online inspection device is simple and convenient to operate, wide in application range, simple and reliable in structure, high in working efficiency and low in manufacturing and using cost, the sealing performance of the valve seat sealing surface of the main steam safety valve is verified in advance, and the conditions that leakage and even a unit retreats from a state and the like caused by unreliable sealing of the valve seat after starting are avoided.
Drawings
FIG. 1 is a schematic structural diagram of a device for checking the tightness of a safety valve seat
FIG. 2 is a view showing the installation effect of a device for checking the sealing performance of a valve seat of a safety valve
In the figure: 1. adjusting bolt, 2, spring, 3, trachea, 4, false valve core, 5, valve cover plate, 6, screw rod, 7, O type sealing washer, 8, valve chamber sealing plug.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
As shown in figure 1, a sealing plug is arranged in the inner cavity of the valve seat, the false valve core 4 is arranged and fixed by utilizing the thread of the lower adjusting ring of the valve seat, and the sealing pressure is changed by adjusting the pressure spring force.
And (3) injecting pressure into a cavity between the false valve core 4 and the valve cavity sealing plug 8, and observing the pressure change to judge the effectiveness of sealing of the valve seat sealing surface.
The device for the online inspection of the sealing surface of the valve seat of the safety valve consists of a valve cavity sealing plug 8, a false valve core 4, a spring 2, a valve cover plate 5 and an air inlet assembly.
The valve cavity sealing plug 8 and the valve are sealed by an O-shaped ring and fixed on the valve core through a bolt to prevent sliding.
During the use, install to the disk seat after assembling valve chamber sealing plug 8, false case 4, spring 2 and valve cover plate 5, adjust spring pressure, connect the air supply and inwards suppress, treat that pressure is stable back, observe internal pressure through the manometer, judge sealed face leakproofness. And after the work is finished, the pressure is released and the air is exhausted.
As shown in fig. 2, the specific operation steps are as follows:
1. removing the lower adjusting ring of the valve seat;
2. the false valve core 4 and the valve cavity sealing plug 8 are assembled into a whole;
3. mounting the assembled parts on a valve seat;
4. a spring 2, a valve cover plate 5 and an adjusting bolt 1 are sequentially arranged;
5. screwing the valve cover plate 5, and adjusting the pressure of the spring 2 to a proper value through the adjusting bolt 1;
6. pressurizing from the air pipe 3 to a fixed value;
7. and (4) observing the pressure gauge, wherein if the pressure in the valve cavity is unchanged, the sealing surface of the valve seat is qualified, otherwise, the sealing surface of the valve seat is unqualified.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (7)
1. An apparatus for checking the tightness of a seat of a safety valve, characterized in that: comprises an adjusting bolt (1), a spring (2), an air pipe (3), a false valve core (4) and a valve cover plate (5); adjusting bolt (1) is installed on valve cover plate (5), and spring (2) are located adjusting bolt (1) under, and valve cover plate (5) lid is in false valve core (4) top, and trachea (3) pass valve cover plate (5) and false valve core (4).
2. The device for checking the tightness of a seat of a safety valve according to claim 1, characterized in that: the plane of the upper part of the false valve core (4) is provided with a bulge, the spring (2) is wound on the bulge part of the false valve core (4), and the height of the spring (2) exceeds the height of the bulge part in a natural state.
3. The device for checking the tightness of a seat of a safety valve according to claim 1, characterized in that: two ends of the false valve core (4) are provided with screws (6) which penetrate through, and the height of the false valve core (4) is adjusted by the screws (6).
4. A device for checking the tightness of a seat of a safety valve according to claim 3, characterized in that: the other end of the screw rod (6) is fixed on the bottom end, and an O-shaped sealing ring (7) and a valve cavity sealing plug (8) are fixedly surrounded on the bottom end.
5. The device for checking the tightness of a seat of a safety valve according to claim 1, characterized in that: the valve cover plate (5) is in an inner buckle cover shape, and the inner structure is hollow.
6. The device for checking the tightness of a seat of a safety valve according to claim 1, characterized in that: the lower part of the false valve core (4) is in a water drop shape.
7. A device for checking the tightness of a seat of a safety valve according to claim 3, characterized in that: the length of two ends of the false valve core (4) is the same as the length of the inside of the valve cover plate (5).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202120553555.4U CN214748709U (en) | 2021-03-18 | 2021-03-18 | Device for checking tightness of valve seat of safety valve |
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CN202120553555.4U CN214748709U (en) | 2021-03-18 | 2021-03-18 | Device for checking tightness of valve seat of safety valve |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113820074A (en) * | 2021-11-22 | 2021-12-21 | 日照朝力信息科技有限公司 | Split testing equipment and testing method for sealing performance of overflow valve |
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2021
- 2021-03-18 CN CN202120553555.4U patent/CN214748709U/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113820074A (en) * | 2021-11-22 | 2021-12-21 | 日照朝力信息科技有限公司 | Split testing equipment and testing method for sealing performance of overflow valve |
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