Sealing structure of ball valve rod

Abstract

The utility model discloses a sealing structure of a valve rod of a ball valve, which relates to the technical field of sealing of the valve rod of the ball valve and comprises a valve body, a ball body is rotatably connected in the valve body, the upper end of the ball body is fixedly connected with the valve rod, a gland is movably arranged above the valve body, a sealing cover is movably arranged above the gland, and the valve rod is fixedly connected with the sealing cover. A first containing groove is formed in the junction of the gland and the valve body, a first sealing piece is arranged in the first containing groove, and spring steel is fixed in the first sealing piece. The first sealing piece is located at the junction of the valve rod, the valve body and the gland, after the gland compresses the first sealing piece, the first sealing piece can guarantee the sealing performance among the valve rod, the valve body and the gland, spring steel is further arranged in the first sealing piece, the strength of the first sealing piece can be enhanced, the first sealing piece is prevented from being obviously deformed after long-time use, and the service life of the valve is prolonged. In addition, the second sealing element is arranged to achieve the effect of second sealing.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing of ball valve stems, in particular to a sealing structure of ball valve stems. Background Art

[0002] The valve stem is a necessary component of the valve. Its function is to transmit the power actuator to the ball to rotate the ball, thereby realizing the opening, closing or adjustment function of the valve. In order to prevent leakage, a seal is required between the valve stem and the valve body or valve cover.

[0003] There is usually only one sealing member between the existing valve body and the valve stem, and the sealing strength is not high. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a sealing structure for a ball valve stem, wherein the first sealing member can ensure the sealing between the valve stem, the valve body and the gland, and the second sealing member serves as a second sealing member.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A sealing structure for a ball valve stem, comprising a valve body, a ball body rotatably connected inside the valve body, a valve stem fixedly connected to the upper end of the ball body, a gland movably arranged above the valve body, a sealing cover movably arranged above the gland, a first receiving groove is provided at the junction of the gland and the valve body, a first sealing member is arranged in the first receiving groove, and spring steel is fixed inside the first sealing member;

[0007] A second sealing member is arranged outside the valve stem, and a second accommodating groove is opened in the middle of the gland.

[0008] Preferably, first flanges are fixed to both ends of the valve body, a second flange is provided on one side of the first flange, and the first flange is connected to the second flange via first bolts.

[0009] Preferably, the longitudinal section of the first sealing component is a "T"-shaped structure, and the first sealing component is made of rubber material.

[0010] Preferably, the second sealing member is fixedly connected to the valve stem, and the size of the second accommodating groove is matched with the size of the second sealing member.

[0011] Preferably, the gland and the sealing cover are fixedly connected to the valve body via second bolts.

[0012] Preferably, a handle is threadedly connected to the outside of the valve stem near the upper end, and the handle is fixedly connected to the valve stem via a nut.

[0013] Preferably, the outside of the handle is sleeved with a rubber sleeve.

[0014] Preferably, a gasket is sleeved on the outside of the valve stem above the handle.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The first seal is located at the junction of the valve stem, the valve body and the gland. After the gland presses the first seal, the first seal can ensure the sealing between the valve stem, the valve body and the gland. Spring steel is also provided in the first seal to enhance the strength of the first seal and avoid obvious deformation of the first seal after long-term use. In addition, the second seal plays the role of the second seal.

[0017] 2. The second receiving groove is opened for installing the valve stem. The second sealing member slides down along the second receiving groove, and the sealing cover is used to fill the second receiving groove to enhance the integrity between the sealing cover and the pressure cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a sealing structure of a ball valve stem proposed by the utility model;

[0019] Figure 2 This is a schematic cross-sectional structure diagram of a sealing structure of a ball valve stem proposed by the utility model;

[0020] Figure 3 A sealing structure for a ball valve stem proposed by the utility model Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0021] Figure 4 It is a schematic cross-sectional structure diagram of a gland in a sealing structure of a ball valve stem proposed by the utility model;

[0022] Figure 5 A sealing structure for a ball valve stem proposed by the utility model Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0023] In the figure: 1. valve body; 2. first flange; 3. second flange; 4. first bolt; 5. ball; 6. valve stem; 7. gland; 8. sealing cover; 9. first receiving groove; 10. first sealing member; 11. spring steel; 12. second sealing member; 13. second receiving groove; 14. second bolt; 15. handle; 16. washer; 17. nut. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] Reference Figure 1-5 A sealing structure of a ball valve stem comprises a valve body 1, first flanges 2 are fixed at both ends of the valve body 1, a second flange 3 is arranged on one side of the first flange 2, the first flange 2 is connected to the second flange 3 by a first bolt 4, a ball 5 is rotatably connected inside the valve body 1, a valve stem 6 is fixedly connected to the upper end of the ball 5, a gland 7 is movably arranged above the valve body 1, a sealing cover 8 is movably arranged above the gland 7, the gland 7 and the sealing cover 8 are fixedly connected to the valve body 1 by a second bolt 14, and a first receptacle is provided at the junction of the gland 7 and the valve body 1. The first receiving groove 9 has a first sealing member 10 arranged in it. The longitudinal section of the first sealing member 10 is a "T"-shaped structure, and the first sealing member 10 is made of rubber. A spring steel 11 is fixed inside the first sealing member 10. After the first sealing member 10 is pressed by the pressure cover 7, the first sealing member 10 can ensure the sealing between the valve stem 6, the valve body 1 and the pressure cover 7. The first sealing member 10 is also provided with a spring steel 11, which can enhance the strength of the first sealing member 10 and avoid obvious deformation of the first sealing member 10 after long-term use.

[0026] A second sealing member 12 is fixed to the outside of the valve stem 6, and a second receiving groove 13 is provided in the middle of the pressure cover 7. The size of the second receiving groove 13 is adapted to the size of the second sealing member 12, and the second sealing member 12 serves as a second seal. The second receiving groove 13 is provided so that the second sealing member 12 can slide down along the second receiving groove 13 when the valve stem 6 is installed.

[0027] A handle 15 is threadedly connected to the outside of the valve stem 6 near the upper end, and a washer 16 is sleeved on the outside of the valve stem 6 above the handle 15. The handle 15 is fixedly connected to the valve stem 6 through a nut 17. The handle 15 is screwed onto the upper end of the valve stem 6, and then the washer 16 is sleeved on the valve stem 6. Finally, the nut 17 is used to fix the handle 15 to the valve stem 6 so that the rotation of the ball 5 can be achieved by rotating the valve stem 6.

[0028] The outside of the handle 15 is sleeved with a rubber sleeve, and the provision of the rubber sleeve can make the grip of the handle 15 more comfortable and facilitate the exertion of force by the human hand.

[0029] In the utility model, the first sealing member 10 is located at the junction between the valve stem 6, the valve body 1 and the gland 7. After the gland 7 presses the first sealing member 10, the first sealing member 10 can ensure the sealing between the valve stem 6, the valve body 1 and the gland 7. A spring steel 11 is also provided in the first sealing member 10 to enhance the strength of the first sealing member 10 and avoid obvious deformation of the first sealing member 10 after long-term use. In addition, the second sealing member 12 plays the role of a second seal. The second accommodating groove 13 is opened for installing the valve stem 6. The second sealing member 12 slides down along the second accommodating groove 13. The sealing cover 8 is used to fill the second accommodating groove 13. Finally, the sealing cover 8 and the gland 7 are fixed to the valve body 1 using the second bolt 14 to complete the sealing between the valve stem 6 and the valve body 1.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sealing structure for a ball valve stem, comprising a valve body (1), characterized in that: A ball (5) is rotatably connected to the interior of the valve body (1), a valve stem (6) is fixedly connected to the upper end of the ball (5), a gland (7) is movably provided above the valve body (1), a sealing cover (8) is movably provided above the gland (7), a first receiving groove (9) is provided at the junction of the gland (7) and the valve body (1), a first sealing member (10) is provided in the first receiving groove (9), and a spring steel (11) is fixed inside the first sealing member (10); A second sealing member (12) is disposed outside the valve stem (6), and a second receiving groove (13) is opened in the middle of the gland (7).

2. A sealing structure for a ball valve stem according to claim 1, characterized in that: A first flange (2) is fixed to both ends of the valve body (1), a second flange (3) is provided on one side of the first flange (2), and the first flange (2) is connected to the second flange (3) via a first bolt (4).

3. The sealing structure of a ball valve stem according to claim 1, characterized in that: The longitudinal section of the first sealing component (10) is in a "T"-shaped structure, and the first sealing component (10) is made of rubber.

4. The sealing structure of a ball valve stem according to claim 1, characterized in that: The second sealing member (12) is fixedly connected to the valve stem (6), and the size of the second receiving groove (13) is matched with the size of the second sealing member (12).

5. The sealing structure of a ball valve stem according to claim 1, characterized in that: The gland (7) and the sealing cover (8) are fixedly connected to the valve body (1) via second bolts (14).

6. The sealing structure of a ball valve stem according to claim 1, characterized in that: A handle (15) is threadedly connected to the outside of the valve stem (6) near the upper end, and the handle (15) is fixedly connected to the valve stem (6) via a nut (17).

7. The sealing structure of a ball valve stem according to claim 6, characterized in that: The outside of the handle (15) is sleeved with a rubber sleeve.

8. The sealing structure of a ball valve stem according to claim 6, characterized in that: A gasket (16) is sleeved on the outside of the valve stem (6) and located above the handle (15).

Images