RU164807U1 - VALVE STOCK SUPPORT BUSHING - Google Patents

Abstract

1. The valve stem support sleeve, wherein said support sleeve (1) is sized to fit the outer diameter of the valve stem (2), characterized in that said valve stem support sleeve (1) contains an perforated thin steel plate (11) in contact with the valve body (4), and made on the inside of the specified perforated thin steel plate (11) corrosion-resistant layer (12) in contact with the specified valve stem (2); while in the holes of the specified perforated thin steel plate (11) a corrosion-resistant compacted layer (13) is provided; at the same time, a seam (14) is also provided on the indicated supporting sleeve (1) of the valve stem, making it easier to put it on the specified valve stem (2). 2. Support sleeve according to claim 1, characterized in that said seam (14) is an inclined seam extending at an angle of 70 °, while the width L of said seam (14) is 0.3 mm≤L≤0.8 mm. 3. The supporting sleeve according to claim 1, characterized in that said corrosion-resistant layer (12) and said corrosion-resistant compacted layer (13) are made entirely using reinforced polytetrafluoroethylene material. 4. The support sleeve according to claim 1, characterized in that said perforated thin steel plate (11) is made using SUS316 stainless steel material.

Description

VALVE STOCK SUPPORT BUSHING

Technical field

The present utility model relates to a sealed element of a valve seat of a large-diameter ball valve, in particular to a valve stem support sleeve.

State of the art

For a large-diameter ball valve, the most important element of the device should be a sealed valve seat element (for example, a sealed valve seat model with a rubber ring made of rubber), as well as the material of the valve stem and bearing construction.

The closest analogue of this utility model is disclosed in the Valve Design Practical Guide, 3rd ed., ISBN: 978-7-11-38999-6, author: Peyven Lu, publ. China Machine Press, 11.10.2012 (Practical Manual of Valve Design, the third edition, ISBN: 978-7-11-38999-6, publisher: China Machine Press, compilation: LU, Peiwen, date of publication: 2012.10.11) , which shows that the support sleeve of the valve stem, as a rule, is made of one material. However, this technical solution has several disadvantages. For example, the manufacture of a valve stem support sleeve from copper can lead to an increase in the coefficient of friction and torque, while the manufacture of the valve stem support sleeve from reinforced polytetrafluoroethylene, which is wear-resistant but has poor refractoriness, not only leads to an increase in the friction coefficient and torque, but also affects tightness and reduces valve life.

The essence of the utility model

Accordingly, the technical task arising from the foregoing is to provide a valve stem support sleeve that will overcome the above-mentioned disadvantages of existing technical solutions. In this utility model, a structural model is mainly used, consisting of a perforated plate and corrosion-resistant material connected to each other, as a result of which foreign objects are prevented from entering the structure, and it is equally possible to provide stable torque and extend the service life.

In the present utility model, the following technical means are applied.

The valve stem support sleeve, wherein said support sleeve is sized to fit the outer diameter of the valve stem, characterized in that said valve stem support sleeve externally comprises a perforated thin steel plate in contact with the valve body and made on the inside of said perforated thin steel plate corrosion resistant layer in contact with the specified valve stem; while in the holes of the specified perforated thin steel plate provided corrosion-resistant compacted layer; on the specified supporting sleeve of the valve stem is also provided with a seam that facilitates putting it on the specified valve pusher.

In addition, the specified seam is an inclined seam extending at an angle of 70 °, while the width L _{1 of the} specified seam is 0.3 mm ≤ L ₁ ≤0.8 mm.

In addition, the specified corrosion-resistant layer and the specified corrosion-resistant compacted layer are made entirely using reinforced polytetrafluoroethylene material.

Furthermore, said perforated thin steel plate is made using SUS316 stainless steel material.

According to the present utility model, heated reinforced polytetrafluoroethylene is pressed against a perforated thin steel plate made using SUS316 stainless steel material, while reinforced polytetrafluoroethylene is pressed into the holes of the perforated thin steel plate, thereby forming an integral plastiform valve stem support sleeve. Then, one side of the reinforced polytetrafluoroethylene acts as the inner side, and the plate is cylindrical in shape, as shown in FIG. 1. To prevent local concentration of loads, an inclined seam is provided, passing at an angle of 70 °.

In use, due to the ability to compress material from reinforced polytetrafluoroethylene, the valve stem support sleeve can be pressed tightly against the valve stem to obtain a tight connection with almost no gap, and even if surface pressure of 95 MPa (surface pressure intensity 12 MPa) or higher is applied, it can also stay very durable.

According to this utility model, foreign objects can be prevented from entering, while foreign objects cannot fall between the valve stem and a layer of reinforced polytetrafluoroethylene, and even if small foreign objects get in there, it is a feature of the valve stem support sleeve to rub and absorb foreign objects therefore they cannot influence a torque. In addition, by retaining the thrust bearing in the ball valve, the valve stem support sleeve cannot change its central position even during continuous use.

According to the present utility model, due to the compact design, the surface pressure rises, foreign objects are prevented from entering the structure, and a stable torque can be provided; by changing the shape of the perforated plate, a surface pressure of 95 MPa or higher can also be used; Due to the function of absorbing foreign objects from reinforced polytetrafluoroethylene material, changes in torque cannot occur and stability of the torque can be ensured for a long period of time.

Description of graphic materials

Below, with reference to the accompanying graphic materials, a method for realizing the present utility model is described in more detail.

In FIG. 1 is a schematic illustration of a device according to the present utility model.

In FIG. 2 shows a schematic representation of a mode using the present utility model.

Reference Positions:

1. supporting sleeve of the valve stem;

11. perforated thin steel plate;

12. corrosion resistant layer;

13. corrosion resistant compacted layer;

14. seam;

2. valve stem;

3. ball;

4. valve body;

5. gland flange;

6. port for supplying sealant;

7. gasket;

8. thrust bearing.

Specific method of implementation

In FIG. 1 shows the arrangement of a valve stem support sleeve, wherein said valve stem support sleeve 1 is sized to fit the outer diameter of the valve stem 2; the specified supporting sleeve 1 of the valve stem from the outside contains a perforated thin steel plate 11 in contact with the valve body 4, and made on the inside of the specified perforated thin steel plate 11 is a corrosion-resistant layer 12 in contact with the specified valve stem 2; in the holes of the specified perforated thin steel plate 11 provides a corrosion-resistant compacted layer 13; a seam 14 is also provided on said support sleeve 1 of the valve stem, making it easier to put it on said valve stem 2.

The specified seam 14 is an inclined seam extending at an angle of 70 °, while the width L _{1 of the} specified seam 14 is 0.3 mm ≤ L ₁ ≤0.8 mm.

The specified corrosion-resistant layer 12 and the specified corrosion-resistant compacted layer 13 are made entirely using reinforced polytetrafluoroethylene material.

The specified perforated thin steel plate 11 is made using SUS316 stainless steel material.

An example of implementation 1

In FIG. 2 shows the upper part of the valve stem design with an operation element of the support sleeve in the upper part. The valve stem experiences the action of fluid pressure inside the ball valve, therefore, a clearance is made on the downstream side to prevent the valve stem 2 from contacting the valve body 4, the width L _{6 of} which is 0.25 mm.

The heated reinforced polytetrafluoroethylene is pressed onto the perforated thin steel plate 11 of the valve stem support sleeve 1 made using SUS316 stainless steel material, thickness L _{3 of} which is 0.8 mm, while the reinforced polytetrafluoroethylene is pressed into the holes of the perforated thin steel plate 11, in as a result of which a corrosion-resistant layer 12 and a corrosion-resistant compacted layer 13 are formed, as a result of which an integral plastiform support sleeve 1 of the valve stem is formed, the thickness L _{4 of} which with leaves 1.63 mm. Then, one side of the corrosion-resistant layer 12 made of reinforced polytetrafluoroethylene acts as an inner side, and the plate is cylindrical in shape, as shown in FIG. 1. As a result, the model consists of a corrosion-resistant layer 12, the thickness L _{2 of} which is 0.83 mm and one side of which is in contact with the valve stem 2, and a perforated thin steel plate AND of 0.8 mm thick SUS316 stainless steel, one side of which is in contact with valve body 4. Finally, to prevent local concentration of loads, an inclined seam 14 is provided extending at an angle of 70 °, while the width L _{1 of the} seam 14 is 0.3 mm≤L ₁ ≤0.8 mm.

If the outer diameter of the support sleeve 1 of the valve stem is ΦD = 100.5 mm, then the inner diameter is dd = 100100.5-t1.63 * 2 = 9797.24 mm. However, the size of the outer diameter of the valve stem 2 of the finished product is Ф97.3 mm, the value of pressing in reinforced polytetrafluoroethylene is determined as 97.24-97.3 = -0.06 mm, in one direction by -0.03 mm, then there is a need to carry out compression by 0.03 mm.

In addition, the tolerance for axial connection (L ₇ ) is 600Aclass, 1400class.

Thus, the thickness of the support sleeve 1 of the valve stem is compressed by 0.03 mm, while in the axial direction a tight joint is obtained with almost no gap, which, when applying a surface pressure of 95 MPa (surface pressure intensity 12 MPa) and higher, can also remain very strong .

In order to prevent foreign objects from falling into the gap between the valve body 4 and the valve stem 2, it corresponds to the tolerance of the insertion element between the two sides of the support sleeve 1 of the valve stem and the valve stem 2, while the length L _{5 of the} insertion element must be 1.63-0.25 = 1.38 mm.

Now, foreign objects cannot easily penetrate between the valve stem 2 and the corrosion-resistant layer 12, and even if small foreign objects get in there, the feature of the valve stem support sleeve is that it scuffs and absorbs foreign objects, so they cannot affect the torque .

Again, due to the fact that without limiting the power, a thrust bearing 8 is used (a gasket 7 is located on top of the thrust bearing 8, a port for supplying sealant 6 is provided on top of the gasket 7, an oil seal flange 5 is firmly installed on top of the port for supplying sealant 6), and taking into account the load applied to the ball 3, a thickness of 0.9 mm is applied (the thickness of reinforced polytetrafluoroethylene is 0.5 mm), small gaps located at a distance, a small diameter of the holes in the perforated thin steel plate, therefore Even with continuous use, the central position also cannot change.

Thus, only the preferred embodiment of the utility model is presented here. However, the scope of protection of the utility model is not limited to this embodiment, and in addition to the embodiments of the utility model described above, other embodiments are possible, using an equivalent replacement or equivalent technical solution is included in the scope of protection of the utility model.

Claims (4)

1. The valve stem support sleeve, wherein said support sleeve (1) is sized to fit the outer diameter of the valve stem (2), characterized in that said valve stem support sleeve (1) contains an perforated thin steel plate (11) in contact with the valve body (4), and made on the inside of the specified perforated thin steel plate (11) corrosion-resistant layer (12) in contact with the specified valve stem (2); while in the holes of the specified perforated thin steel plate (11) a corrosion-resistant compacted layer (13) is provided; at the same time, a seam (14) is also provided on the indicated supporting sleeve (1) of the valve stem, which facilitates putting it on the specified valve stem (2). 2. The support sleeve according to claim 1, characterized in that said seam (14) is an inclined seam extending at an angle of 70 °, while the width L _{1 of} said seam (14) is 0.3 mm ≤ L ₁ ≤0.8 mm . 3. A support sleeve according to claim 1, characterized in that said corrosion-resistant layer (12) and said corrosion-resistant compacted layer (13) are made entirely using reinforced polytetrafluoroethylene material. 4. The support sleeve according to claim 1, characterized in that said perforated thin steel plate (11) is made using SUS316 stainless steel material.

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