Telescopic eccentric semi-ball valve

Abstract

The utility model discloses a telescopic eccentric semi-ball valve, which relates to the technical field of valves and comprises a valve body, a valve rod, a valve seat and a semi-ball body, the valve body is provided with an inlet end and an outlet end, the semi-ball body is rotatably arranged in the valve body, the valve rod comprises an upper valve rod and a lower valve rod, the lower end of the upper valve rod is connected with the semi-ball body, and the upper end of the upper valve rod penetrates out of the valve body to be connected with an actuating mechanism. The lower valve rod is arranged below the hemisphere, the valve seat is arranged at the outlet end of the valve body, a telescopic pipe flange assembly is arranged at the inlet end of the valve body and comprises a telescopic pipe and a connecting flange, the connecting flange is fixed to the inlet side of the valve body through a screw, a telescopic check ring is arranged at the tail end of the telescopic pipe, and the telescopic check ring is connected with the telescopic pipe. The connecting flange is provided with a protrusion matched with the telescopic check ring, and the telescopic pipe is in sliding sealing fit with the connecting flange. The device is simple in structure and convenient to operate, can effectively solve the problem that a valve is difficult to install due to the fact that a pipeline construction steel pipe is too long or too short, and is easy to install.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a telescopic eccentric hemispherical valve. Background Art

[0002] The eccentric hemispheric valve adopts eccentric technology, so the torque of opening and closing the valve is small. The friction between the valve core and the valve seat only occurs at the moment of opening or closing. The service life is long. Therefore, it is widely used in petroleum, chemical industry, urban water supply and drainage and other working conditions.

[0003] During the installation of the eccentric semi-ball valve, due to different pipeline working conditions, it is inevitable that the steel pipe is too long or too short, and the pipeline needs to be cut or welded before installation. Therefore, people have studied an eccentric semi-ball valve with a telescopic function, which solves the impact of pipeline construction and pipeline thermal expansion on the pipeline by connecting a pipeline expander outside the eccentric semi-ball valve. The existing eccentric semi-ball valve with a telescopic function controls the displacement of the telescopic tube by arranging a telescopic screw on the periphery of the valve body to prevent the telescopic tube from excessively moving outward and separating from the valve body. The additional telescopic structure makes the operation cumbersome and the installation inconvenient. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a telescopic eccentric hemispherical valve.

[0005] The technical solution provided by the utility model is:

[0006] A telescopic eccentric hemispherical valve comprises a valve body, a valve stem, a valve seat and a hemispherical body. The valve body is provided with an inlet end and an outlet end. The hemispherical body is rotatably arranged in the valve body. The valve stem comprises an upper valve stem and a lower valve stem. The lower end of the upper valve stem is connected to the hemispherical body, and the upper end passes through the valve body and is connected to the actuator. The lower valve stem is arranged below the hemispherical body. The valve seat is arranged at the outlet end of the valve body. A telescopic tube flange assembly is provided at the inlet end of the valve body. The telescopic tube flange assembly comprises a telescopic tube and a connecting flange. The connecting flange is fixed to the inlet side of the valve body by screws. A telescopic retaining ring is provided at the tail end of the telescopic tube. The connecting flange is provided with a protrusion that cooperates with the telescopic retaining ring. The telescopic tube and the connecting flange form a sliding seal.

[0007] The rear end of the telescopic tube is provided with a mounting groove, the telescopic retaining ring is installed in the mounting groove, and the outer edge of the telescopic retaining ring is higher than the groove wall of the mounting groove.

[0008] A step surface is provided on the inner side of the connecting flange, and a sealing ring is provided between the step surface and the valve body.

[0009] An O-ring is arranged between the connecting flange and the telescopic tube.

[0010] A valve seat gland is provided on the outside of the valve seat, and the valve seat gland is detachably connected to the valve body via screws.

[0011] A packing is arranged between the upper valve stem and the valve body, a packing gland is arranged above the packing, and the packing gland is used to compress the packing by bolts.

[0012] The beneficial effects of the utility model are as follows: the utility model provides a connecting flange and a telescopic retaining ring at the rear end of the telescopic tube, and the connecting flange provides a protrusion that cooperates with the telescopic retaining ring. The telescopic tube can be adjusted for lateral displacement without additional operation. The cooperation between the telescopic retaining ring and the protrusion can prevent the telescopic tube from excessively moving outward and separating from the valve body. The utility model has a simple structure and is easy to operate. It can effectively solve the problem of difficult installation of valves due to too long or too short steel pipes in pipeline construction, and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model;

[0014] Figure 2 for Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0015] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0016] like Figure 1-2 As shown, a telescopic eccentric hemispherical valve comprises a valve body 1, a valve stem, a valve seat 4 and a hemispherical body 3. The valve body 1 is provided with an inlet end 11 and an outlet end 12. The hemispherical body 3 is rotatably arranged in the valve body 1. The valve stem comprises an upper valve stem 2 and a lower valve stem 6. The lower end of the upper valve stem 2 is connected to the hemispherical body 3, and the upper end passes through the valve body 1 and is connected to the actuator 8. The lower valve stem 6 is arranged below the hemispherical body 3 for supporting the hemispherical body 3. The valve seat 4 is arranged at the outlet end 12 of the valve body. A valve seat gland 5 is arranged on the outside of the valve seat 4. The valve seat gland 5 is detachably connected to the valve body 1 by screws, so as to facilitate the replacement of the valve seat.

[0017] In this embodiment, a telescopic tube flange assembly is provided at the inlet end 11 of the valve body, and the telescopic tube flange assembly includes a telescopic tube 13 and a connecting flange 15. The connecting flange 15 is fixed to the inlet side of the valve body by screws 18. A mounting groove 14 is provided at the tail end of the telescopic tube 13, and a telescopic retaining ring 17 is installed in the mounting groove 14. The telescopic retaining ring 17 and the telescopic tube 13 can be connected by threaded connection or rivet connection. The outer edge of the telescopic retaining ring 17 is higher than the groove wall of the mounting groove 14. The connecting flange 15 is provided with a protrusion 16 that cooperates with the telescopic retaining ring 17. An O-ring 19 is provided between the connecting flange 15 and the telescopic tube 13, and the two constitute a sliding seal. In the actual pipeline installation process, the telescopic tube 13 can slide laterally relative to the valve body 1 to adapt to different pipelines. When the telescopic tube 13 moves outward to the maximum limit, the telescopic retaining ring 17 and the protrusion 16 are abutted, which can prevent the telescopic tube 13 from excessively moving outward and separating from the valve body. The structure is simple and the operation is convenient. It can effectively solve the problem that the steel pipe of the pipeline construction is too long or too short to install the valve, and the installation is simple.

[0018] In this embodiment, a step surface is provided on the inner side of the connecting flange 15, and a sealing ring 20 is provided between the step surface and the valve body 1 to prevent the medium from leaking from the gap between the connecting flange 15 and the valve body 1. A packing 10 is provided between the upper valve stem 2 and the valve body 1, and a packing gland 9 is provided above the packing 10. The packing gland 9 presses the packing 10 with bolts to prevent the medium from leaking from the gap between the upper valve stem 2 and the valve body 1, thereby ensuring the reliability of the valve sealing.

[0019] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A telescopic eccentric hemispherical valve, comprising a valve body, a valve stem, a valve seat, and a hemispherical body. The valve body is provided with an inlet end and an outlet end. The hemispherical body is rotatably arranged in the valve body. The valve stem comprises an upper valve stem and a lower valve stem. The lower end of the upper valve stem is connected to the hemispherical body, and the upper end passes through the valve body and is connected to the actuator. The lower valve stem is arranged below the hemispherical body. The valve seat is arranged at the outlet end of the valve body. The valve body is characterized in that: A telescopic tube flange assembly is provided at the inlet end of the valve body, and the telescopic tube flange assembly includes a telescopic tube and a connecting flange. The connecting flange is fixed to the inlet side of the valve body by screws. A telescopic retaining ring is provided at the tail end of the telescopic tube, and the connecting flange is provided with a protrusion that cooperates with the telescopic retaining ring. The telescopic tube and the connecting flange form a sliding seal.

2. The telescopic eccentric hemispherical valve according to claim 1, characterized in that: The rear end of the telescopic tube is provided with a mounting groove, the telescopic retaining ring is installed in the mounting groove, and the outer edge of the telescopic retaining ring is higher than the groove wall of the mounting groove.

3. The telescopic eccentric hemispherical valve according to claim 1, characterized in that: A step surface is provided on the inner side of the connecting flange, and a sealing ring is provided between the step surface and the valve body.

4. The telescopic eccentric hemispherical valve according to claim 1, characterized in that: An O-ring is arranged between the connecting flange and the telescopic tube.

5. The telescopic eccentric hemispherical valve according to claim 1, characterized in that: A valve seat gland is provided on the outside of the valve seat, and the valve seat gland is detachably connected to the valve body via screws.

6. The telescopic eccentric hemispherical valve according to claim 1, characterized in that: A packing is arranged between the upper valve stem and the valve body, a packing gland is arranged above the packing, and the packing gland is used to compress the packing by bolts.

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