CN217003343U - Straight stroke valve rod seal assembly - Google Patents
Straight stroke valve rod seal assembly Download PDFInfo
- Publication number
- CN217003343U CN217003343U CN202220687797.7U CN202220687797U CN217003343U CN 217003343 U CN217003343 U CN 217003343U CN 202220687797 U CN202220687797 U CN 202220687797U CN 217003343 U CN217003343 U CN 217003343U
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- valve rod
- valve
- bellows
- pipe
- corrugated pipe
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Abstract
The utility model relates to the technical field of valves, in particular to a straight stroke valve rod sealing assembly which comprises a corrugated pipe, a thrust pipe and a fixing ring, wherein the thrust pipe is installed in the corrugated pipe, a valve rod is installed in the thrust pipe, a first sealing ring is installed between the corrugated pipe and the thrust pipe, the fixing ring is installed on the outer circumference of the upper portion of the corrugated pipe and is installed on a connecting flange between a valve cover and a valve body, a second sealing ring is installed on a sealing surface of the bottom of the corrugated pipe, a valve core is installed at the bottom of the valve rod, the upper portion of the valve rod is locked through a locking nut, and in the screwing process of the locking nut, a sealing surface at the top of the valve core and a sealing surface at the bottom of the corrugated pipe are gradually attached and sealed.
Description
Technical Field
The utility model relates to the technical field of valves, in particular to a straight-stroke valve rod sealing assembly.
Background
The valve rod of the fluorine-lined straight stroke valve is mostly sealed in a packing sealing mode at present, the packing sealing is contact sealing, the valve which frequently acts is worn to a certain extent by the valve rod and the packing at the contact part of the valve rod and the packing, when the valve rod and the packing are worn to a certain extent, leakage can be generated, and the sealing mode is not suitable for strong corrosion and toxic and harmful media under the background that the national and social requirements on safety and environmental protection are stricter and stricter.
In addition, the forces to be overcome by the action of the straight stroke valve mainly include friction force between the filler and the valve rod, pressure difference of media, self weight of the valve core assembly and the like. Friction force can be greatly different due to different tightness of the filler, the valve rod can be leaked when the filler is pressed to be too loose, friction force is large when the filler is pressed to be too tight, the load of an actuator is increased, if the power margin of the actuator is not enough, the valve can be difficult to open and close seriously, and the service life of the valve is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a straight stroke valve rod sealing assembly to solve the problem that a fluorine-lined straight stroke valve in the prior art is easy to leak.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a straight stroke valve rod seal assembly, includes bellows, distance tube and solid fixed ring, the distance tube is installed in the bellows, the valve rod is installed in the distance tube, install first sealing washer between bellows and the distance tube, install solid fixed ring on the outer circumference on bellows upper portion, gu fixed ring installs on the flange between valve gap and valve body, install the second sealing washer on the sealed face of bellows bottom, the case is installed to the valve rod bottom, valve rod upper portion is passed through lock nut and is locked, lock nut screws up in the process, the sealed face of case top and the sealed face of bellows bottom paste tight seal gradually.
Preferably, a third sealing ring is installed on the outer circumference of the upper portion of the corrugated pipe, and the third sealing ring is located below the fixing ring.
Preferably, the bellows is a tetrafluoro bellows.
Preferably, an elastic pad is arranged between the locking nut and the thrust pipe.
Compared with the prior art, the utility model has the beneficial effects that: the friction force between the valve rod and the filler, which needs to be overcome when the valve is started, is changed into the problem of overcoming the elastic deformation force of the tetrafluoro bellows, and the force required by elastic deformation does not change in principle, so that the material property cannot change greatly.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is an exploded view of the present invention.
In the figure: 1 valve rod, 2 lock nut, 3 bullet pads, 4 thrust pipes, 5 solid fixed rings, 6 third sealing rings, 7 first sealing rings, 8 bellows, 9 second sealing rings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a straight stroke valve rod sealing assembly comprises a corrugated pipe 8, a thrust pipe 4 and a fixing ring 5, wherein the thrust pipe 4 is installed in the corrugated pipe 8, a valve rod 1 is installed in the thrust pipe 4, a first sealing ring 7 is installed between the corrugated pipe 8 and the thrust pipe 4, the fixing ring 5 is installed on the outer circumference of the upper portion of the corrugated pipe 8, the fixing ring 5 is installed on a connecting flange between a valve cover and a valve body, a second sealing ring 9 is installed on the sealing surface of the bottom of the corrugated pipe 8, a valve core is installed at the bottom of the valve rod 1, the upper portion of the valve rod 1 is locked through a locking nut 2, in the screwing process of the locking nut 2, the sealing surface of the top of the valve core and the sealing surface of the bottom of the corrugated pipe 8 are gradually attached and sealed, so that the friction force between the valve rod 1 and a filler which needs to be overcome when the valve is started is changed into the force for overcoming the elastic deformation of the PTFE corrugated pipe 8, and the force for the elastic deformation of the PTFE corrugated pipe 8 is almost stable, consequently can not appear revealing the problem along with the increase of live time, this application has also reduced the moment that the valve need when opening and close in addition, has prolonged the life of equipment.
Preferably, a third sealing ring 6 is installed on the outer circumference of the upper part of the corrugated pipe 8, the third sealing ring 6 is located below the fixing ring 5, and the third sealing ring 6 is used for sealing the valve body and the valve cover.
Preferably, the bellows 8 in this embodiment is a tetrafluoro bellows 8, which is not easy to corrode and age, and has a small elastic deformation force and a long service life.
Preferably, an elastic pad 3 is arranged between the locking nut 2 and the thrust pipe 4.
The installation step: the first sealing ring 7 is arranged in a corrugated pipe 8, the thrust pipe 4 is arranged in the corrugated pipe 8, then the valve rod 1 is arranged in the thrust pipe 4, the second sealing ring 9 is embedded in the sealing surface at the bottom of the corrugated pipe 8, then the lower part of the valve rod 1 is provided with a valve core such as a flashboard of a gate valve, a valve core of a stop valve or a regulating valve and the like, threads at the lower part of the valve rod 1 are screwed, the valve core is fixed on the valve rod 1, then an elastic pad 3 and a locking nut 2 are sequentially arranged from the upper part of the valve rod 1, the components with different specifications of the locking nut 2 are screwed, the torque is different, the thrust pipe 4 slides towards the lower part along with the screwing process of the locking nut 2, simultaneously pressing force is applied to the lower part of the corrugated pipe 8, the sealing surface at the bottom of the corrugated pipe 8 is gradually attached to the sealing surface of the valve core, sealing is formed by the deformation of the second sealing ring 9, and then a third sealing ring 6 and a fixing ring 5 are sequentially arranged at the upper part of the corrugated pipe 8 respectively, and (5) finishing the assembly.
According to the utility model, the friction force between the valve rod 1 and the filler which needs to be overcome when the valve is started is changed into the problem of overcoming the elastic deformation force of the tetrafluoro bellows 8, and the material property can not be changed greatly because the force required by elastic deformation does not change in principle.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A straight stroke valve stem seal assembly characterized by: including bellows (8), thrust pipe (4) and solid fixed ring (5), install in bellows (8) thrust pipe (4), install in thrust pipe (4) valve rod (1), install first sealing washer (7) between bellows (8) and thrust pipe (4), install solid fixed ring (5) on the outer circumference in bellows (8) upper portion, gu fixed ring (5) install on the flange between valve gap and valve body, install second sealing washer (9) on the sealed face of bellows (8) bottom, the case is installed to valve rod (1) bottom, valve rod (1) upper portion is locked through lock nut (2), lock nut (2) screw up in-process, the sealed face of case top and bellows (8) bottom progressively pastes tight seal.
2. A straight stroke valve stem seal assembly as defined in claim 1 wherein: install third sealing washer (6) on bellows (8) upper portion outer circumference, third sealing washer (6) are located the below of solid fixed ring (5).
3. A straight stroke valve stem seal assembly as defined in claim 1 wherein: the corrugated pipe (8) is a PTFE corrugated pipe (8).
4. A straight stroke valve stem seal assembly as defined in claim 1 wherein: and an elastic pad (3) is arranged between the locking nut (2) and the thrust pipe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220687797.7U CN217003343U (en) | 2022-03-28 | 2022-03-28 | Straight stroke valve rod seal assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220687797.7U CN217003343U (en) | 2022-03-28 | 2022-03-28 | Straight stroke valve rod seal assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217003343U true CN217003343U (en) | 2022-07-19 |
Family
ID=82371832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220687797.7U Active CN217003343U (en) | 2022-03-28 | 2022-03-28 | Straight stroke valve rod seal assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217003343U (en) |
-
2022
- 2022-03-28 CN CN202220687797.7U patent/CN217003343U/en active Active
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| GR01 | Patent grant |