Ball valve sealing structure

Abstract

The utility model discloses a ball valve sealing structure. The ball valve sealing structure comprises a valve body, a valve rod, a ball core, a V-shaped filler and a valve seat, the valve seat, the ball core, the V-shaped filler and the valve rod are sequentially installed in the valve body, the valve further comprises a gland nut installed on the valve rod, and sealing mechanisms are arranged between the gland nut and the V-shaped filler and between the ball core and the valve body. According to the utility model, after the ball valve is used for a long time, even if the gland nut is loosened, the elastic washer arranged between the gland nut and the V-shaped filler still plays a pressure compensation role on the V-shaped filler, so that the V-shaped filler is always kept in a pressed and sealed state, and the sealing performance of the ball valve is kept.

Description

Technical Field

[0001] This utility model belongs to the field of ball valve technology and relates to a ball valve sealing structure. Background Technology

[0002] A ball valve is a type of valve that is operated by a valve stem and rotates around the valve axis. It can also be used for fluid regulation and control. Among them, the hard-seal V-type ball valve has a strong shearing force between its V-shaped ball core and the metal valve seat with hard alloy overlay, making it particularly suitable for media containing fibers, small solid particles, etc. Multi-port ball valves can not only flexibly control the merging, splitting, and switching of the flow direction of media in pipelines, but also close any channel while connecting the other two channels.

[0003] The following problems are prone to occur during the use of ball valves: 1. After prolonged use, the gland nut may loosen, causing gaps between the V-type packing and the valve body, resulting in reduced sealing performance of the ball valve; 2. After prolonged use, the sealing ring between the ball valve and the valve body may tear, further reducing the sealing performance of the ball valve; 3. During installation, the valve seat may be installed backwards, leading to assembly mismatch between the ball core and the valve seat.

[0004] To address the aforementioned problems, this utility model proposes a ball valve sealing structure. Utility Model Content

[0005] To address the problems existing in the background technology, this utility model proposes a ball valve sealing structure.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a ball valve sealing structure, including a valve body, a valve stem, a ball core, a V-type packing, and a valve seat; the valve seat, the ball core, the V-type packing, and the valve stem are sequentially installed in the valve body, and a gland nut installed on the valve stem is also included, with sealing mechanisms provided between the gland nut and the V-type packing, and between the ball core and the valve body.

[0007] Furthermore, the sealing mechanism includes an elastic element installed between the gland nut and the V-shaped packing, the elastic element abutting between the V-shaped packing and the gland nut.

[0008] Furthermore, the elastic element includes an elastic washer, which is sleeved on the valve stem and abuts against the V-shaped packing and the gland nut.

[0009] Furthermore, the elastic washer includes a first spring portion and a second spring portion, with one end of the first spring portion and the second spring portion fixedly connected, and the cross-section of the elastic washer is V-shaped.

[0010] Furthermore, the sealing mechanism includes a seal installed between the ball core and the valve body.

[0011] Further, the sealing member comprises an O-ring and a Teflon sealing bushing.

[0012] Further, the Teflon sealing bushing is installed in the valve body and abuts between the ball core and the valve body.

[0013] Further, the O-ring is installed in the valve body and abuts the Teflon sealing bushing.

[0014] Further, the valve seat comprises the same structure of the mounting portion.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1、in the utility model, when the ball valve is used for a long time, even if the gland nut is loose, the elastic washer installed between the gland nut and the V-shaped packing still plays a pressure compensation role on the V-shaped packing, so that the V-shaped packing always maintains a tight sealing state, and the sealing performance of the ball valve is maintained.

[0017] 2、in the embodiment, when the ball valve is used for a long time, the Teflon sealing bushing installed between the ball core and the valve body can still ensure the sealing property between the ball core and the valve body, and guarantee the sealing performance of the ball valve. Meanwhile, the double sealing structure of the O-ring and the Teflon sealing bushing is suitable for low-temperature 40-degree sealing.

[0018] 3、in the embodiment, the valve seat with the same structure of the mounting portion is used in installation, so that the installation is prevented from being reversed, the installation efficiency of the ball valve is improved, and the assembly coordination of the ball core and the valve seat during installation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of embodiment 1;

[0020] Figure 2 is a sectional view of the elastic washer in embodiment 1;

[0021] Figure 3 is a structural schematic view of embodiment 2;

[0022] Figure 4 is a structural schematic view of embodiment 3;

[0023] Figure 5 is a sectional view of the valve seat in embodiment 3.

[0024] In the drawing: 1, valve body; 2, valve rod; 3, ball core; 4, V-shaped packing; 5, valve seat; 51, mounting portion; 6, gland nut; 7, elastic washer; 71, first elastic sheet portion; 72, second elastic sheet portion; 8, O-ring; 9, Teflon sealing bushing. DETAILED DESCRIPTION

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1

[0027] like Figures 1-2 As shown, the technical solution adopted by this utility model is as follows: A ball valve sealing structure includes a valve body 1, a valve stem 2, a ball core 3, a V-type packing 4, and a valve seat 5. The valve seat 5, ball core 3, V-type packing 4, and valve stem 2 are sequentially installed inside the valve body 1. Specifically, the valve seat 5 is installed inside the valve body 1, the ball core 3 is installed on the valve stem 2 and then installed inside the valve body 1 via the valve stem 2, and the V-type packing 4 is sleeved on the valve stem 2 and placed inside the valve body 1. It also includes a gland nut 6, which is screwed onto the valve stem 2. A sealing mechanism is provided between the gland nut 6 and the V-type packing 4. Even if the gland nut 6 loosens after prolonged use of the ball valve, this sealing mechanism still provides pressure compensation for the V-type packing 4, ensuring that the V-type packing 4 remains in a compressed and sealed state, thus maintaining the sealing performance of the ball valve.

[0028] In this embodiment, the sealing mechanism includes an elastic element installed between the gland nut 6 and the V-type packing 4. When the elastic element is installed between the gland nut 6 and the V-type packing 4, due to the elasticity of the elastic element itself, the elastic element always abuts against the V-type packing 4 and the gland nut 6, ensuring the pressure generated by the gland nut 6 on the V-type packing 4, thereby maintaining the sealing performance of the ball valve.

[0029] In this embodiment, the elastic element includes an elastic washer 7, which is sleeved on the valve stem 2 and abuts against the V-shaped packing 4 and the gland nut 6.

[0030] In this embodiment, the elastic washer 7 includes a first spring portion 71 and a second spring portion 72, with one end of the first spring portion 71 and the second spring portion 72 fixedly connected. The longitudinal section of the elastic washer 7 is V-shaped. Due to the V-shaped design of the elastic washer 7, the elastic washer 7 always maintains its elasticity. Specifically, the first spring portion 71 abuts against the pressure cap nut 6, and the second spring portion 72 abuts against the V-shaped packing 4.

[0031] Example 2

[0032] like Figure 3As shown, the technical solution adopted by this utility model is as follows: A ball valve sealing structure includes a valve body 1, a valve stem 2, a ball core 3, a V-type packing 4, and a valve seat 5. The valve seat 5, ball core 3, V-type packing 4, and valve stem 2 are sequentially installed inside the valve body 1. Specifically, the valve seat 5 is installed inside the valve body 1, the ball core 3 is installed on the valve stem 2 and then installed inside the valve body 1 via the valve stem 2, and the V-type packing 4 is sleeved on the valve stem 2 and placed inside the valve body 1. It also includes a gland nut 6, which is screwed onto the valve stem 2. A sealing mechanism is provided between the ball core 3 and the valve body 1. Even after prolonged use, the sealing mechanism between the ball core 3 and the valve body 1 still ensures the sealing performance between them, guaranteeing the sealing performance of the ball valve.

[0033] In this embodiment, the sealing mechanism includes a sealing element installed between the ball core 3 and the valve body 1.

[0034] In this embodiment, the sealing element includes an O-ring 8 and a PTFE sealing bushing 9. The double-sealing structure of the O-ring 8 and the PTFE sealing bushing 9 improves the sealing performance between the ball core 3 and the valve body 1, ensuring the sealing performance of the ball valve.

[0035] In this embodiment, a double-sealing structure of O-ring 8 and PTFE sealing bushing 9 is adopted, which is suitable for sealing at low temperature of 40 degrees Celsius.

[0036] In this embodiment, the PTFE sealing bushing 9 is installed inside the valve body 1 and abuts against the ball core 3 and the valve body 1.

[0037] In this embodiment, the O-ring 8 is installed inside the valve body 1 and abuts against the PTFE sealing bushing 9.

[0038] Example 3

[0039] like Figures 4-5 As shown, the technical solution adopted by this utility model is as follows: A ball valve sealing structure includes a valve body 1, a valve stem 2, a ball core 3, a V-shaped packing 4, and a valve seat 5. The valve seat 5, ball core 3, V-shaped packing 4, and valve stem 2 are sequentially installed inside the valve body 1. Specifically, the valve seat 5 is installed inside the valve body 1, the ball core 3 is installed on the valve stem 2 and then installed inside the valve body 1 via the valve stem 2, and the V-shaped packing 4 is sleeved on the valve stem 2 and placed inside the valve body 1. It also includes a pressure cap nut 6, which is screwed onto the valve stem 2. A sealing mechanism is provided between the ball core 3 and the valve body 1.

[0040] In this embodiment, the valve seat 5 includes a mounting portion 51 with the same structure. Using a mounting portion 51 with the same structure prevents the valve seat 5 from being installed backwards, improves the ball valve installation efficiency, and enhances the assembly coordination between the ball core 3 and the valve seat 5 during installation.

[0041] Although the utility model has been explained in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A ball valve sealing structure, comprising a valve body (1), a valve stem (2), a ball core (3), a V-shaped packing (4) and a valve seat (5); the valve seat (5), the ball core (3), the V-shaped packing (4) and the valve stem (2) are sequentially installed in the valve body (1), characterized in that: The sealing mechanism is arranged between the V-shaped packing (4) and the gland nut (6), and between the ball core (3) and the valve body (1).

2. The ball valve seal structure of claim 1, wherein: The sealing mechanism comprises an elastic piece arranged between the V-shaped packing (4) and the gland nut (6).

3. The ball valve seal structure of claim 2, wherein: The elastic piece comprises an elastic washer (7) sleeved on the valve rod (2) and abutting against the V-shaped packing (4) and the gland nut (6).

4. The ball valve seal structure of claim 3, wherein: The elastic washer (7) comprises a first elastic sheet part (71) and a second elastic sheet part (72) fixed at one end, and the longitudinal section of the elastic washer (7) is arranged in a V shape.

5. The ball valve seal structure of claim 1, wherein: The sealing mechanism comprises a sealing piece arranged between the ball core (3) and the valve body (1).

6. The ball valve seal structure of claim 5, wherein: The sealing piece comprises an O-shaped ring (8) and a Teflon sealing bushing (9).

7. The ball valve seal structure of claim 6, wherein: The Teflon sealing bushing (9) is arranged in the valve body (1) and abuts against the ball core (3) and the valve body (1).

8. The ball valve seal structure of claim 7, wherein: The O-shaped ring (8) is arranged in the valve body (1) and abuts against the Teflon sealing bushing (9).

9. The ball valve seal structure of claim 1, wherein: The valve seat (5) comprises an installation part (51) with the same structure.

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