Ball valve with anti-loosening structure

Abstract

The utility model provides a ball valve with an anti-loose structure, which comprises a valve body, a valve rod and a handle, one end of the valve rod is arranged in the valve body, the other end of the valve rod extends out of the valve body from a valve rod channel at the upper end of the valve body, and a lower packing pad, packing and an upper packing pad which are annularly sleeved on the valve rod are arranged in the valve rod channel from bottom to top. A packing gland is arranged on the upper packing pad, the handle is arranged on the packing gland, the handle is kept on the valve rod through a nut arranged at the upper end of the valve rod, a lock washer is arranged between the nut and the handle, a bendable lock claw is arranged on the lock washer, and when the nut is screwed down, the lock claw can be bent, so that the lock claw can be bent. The locking claw is bent and abuts against the hexagon of the nut. The anti-loosening nut is simple in structure, low in manufacturing cost and good in anti-loosening effect, and effectively guarantees sealing at the position of the valve rod.

Description

Technical Field

[0001] The utility model relates to the field of valves, and particularly relates to a ball valve with a loosening prevention structure. Background Art

[0002] The stem seal of a small-diameter ball valve (DN≤20) generally includes packing, a packing gland, a positioning block, a handle, a washer, a nut, etc. The seal at the stem is pre-tightened by the nut and compensated by the washer. During the opening or closing process of this type of ball valve, the nut will be jolted and impacted. Under the condition of mutual friction, the pre-tightening force will have a counterclockwise screwing effect on the nut. If the pre-tightening force and the compensation force are insufficient, frequent rotation of the handle is likely to cause the nut to loosen, resulting in a potential leakage hazard at the stem. Content of the Utility Model

[0003] The purpose of the utility model is to provide a ball valve with a loosening prevention structure, which solves the technical problems that the stem nut of the existing ball valve is prone to loosen and there is a potential leakage hazard in the stem seal as pointed out in the background art.

[0004] To achieve the above purpose, the utility model provides a ball valve with a loosening prevention structure: including a valve body, a valve stem, and a handle. One end of the valve stem is arranged in the valve body, and the other end extends from the valve stem channel at the upper end of the valve body to the outside of the valve body. A lower packing pad, packing, and an upper packing pad sleeved on the valve stem are arranged in the valve stem channel from bottom to top. A packing gland is arranged on the upper packing pad, the handle is arranged on the packing gland, the handle is held on the valve stem by a nut arranged at the upper end of the valve stem, a stop washer is arranged between the nut and the handle, and a bendable stop claw is arranged on the stop washer. When the nut is tightened, the stop claw bends and abuts against the hexagon of the nut.

[0005] Preferably, a handle limiting part is arranged on the stop washer.

[0006] Preferably, a valve stem spring is further arranged between the nut and the handle, and the valve stem spring is located below the stop washer.

[0007] Preferably, the stop claw is rectangular.

[0008] Preferably, the stop claw is trapezoidal.

[0009] Compared with the prior art, the beneficial effect of the utility model is that a stop washer is arranged between the handle and the nut. When the nut is tightened on the valve stem, the stop claw on the stop washer is bent so that the stop claw abuts against the hexagon of the nut to prevent the nut from loosening. The utility model has a simple structure, low manufacturing cost, good nut loosening prevention effect, and effectively guarantees the seal at the stem. Description of the Drawings

[0010] Figure 1 Shown is a schematic structural view of the present utility model, in which the valve stem sealing part is partially sectioned;

[0011] Figure 2 Shown is a partially enlarged view of the valve stem sealing part of the present utility model;

[0012] Figure 3 Shown is a top view of the present utility model;

[0013] Figure 4 Shown is a schematic structural view of a stop washer;

[0014] Figure 5 Shown is a schematic structural view of a preferred stop washer;

[0015] Figure 6 Shown is a stop washer with another preferred structure;

[0016] Figure 7 Shown is a stop washer with yet another preferred structure;

[0017] In the figure, 1. valve body; 2. valve stem; 3. lower packing gasket; 4. packing; 5. upper packing gasket; 6. packing gland; 7. valve stem spring; 8. stop washer; 9. handle; 10. valve stem passage; 11. nut; 12. stop claw; 13. flat position hole; 14. bent portion; 15. nut hexagon; 16. side; 17. positioning pin. Detailed implementation manners

[0018] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but is merely representative of the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0020] It should be noted that: like reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the present utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0022] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0023] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] The following will describe in detail some embodiments of the present utility model with reference to the drawings.

[0025] As Figures 1 to 4 shown, a ball valve with an anti-loosening structure according to the present utility model includes a valve body 1, a valve stem 2, and a handle 9. A valve ball is provided inside the valve body 1. The lower end of the valve stem 2 is connected to the valve ball, and the upper end extends out of the valve body 1 from the valve stem channel 10 on the valve body 1. The valve stem channel 10 is a stepped hole that is wider at the top and narrower at the bottom. A lower packing gasket 3, a packing 5, and an upper packing gasket 4 are sequentially sleeved on the valve stem 2, and are held in the valve stem channel 10 by a packing gland 6 provided on the upper packing gasket 4. The handle 9 is placed above the packing gland 6. A nut 11 is threadedly connected to the upper end of the valve stem 2 to fix the handle 9 on the valve stem 2, and at the same time provides an axial pressing force on the packing 5 to provide necessary sealing for the valve stem 2.

[0026] A stop washer 8 is provided between the handle 9 and the nut 11. A flat position hole 13 is provided in the middle of the stop washer 8, and a stop claw 12 is provided at the edge. The flat position hole 13 forms a limit with the flat position of the valve stem, and the stop claw 12 can be bent upward. When the handle 9 is rotated, the handle 9 rotates together with the stop washer 8. A positioning pin 17 for limiting the rotation angle of the handle 2 is also provided on the valve body 1.

[0027] A downward handle limiting portion 14 may also be provided on the stop washer 8. Refer to the appendix Figure 3 and 5 . The handle limiting portion 14 and the side surface 16 of the handle 9 form a limit to ensure that the handle 9 and the stop washer 8 rotate simultaneously. A valve stem spring 7 may also be provided between the stop washer 8 and the handle 9. The valve stem spring 7 can provide axial compensation for the valve stem seal to make the force more uniform.

[0028] The stop washer 8 needs to have a certain rigidity and toughness and can be made of hardened 304 / 316 sheet material. The shape of the stop claw 12 can be, for example, triangular, semi-circular, diamond-shaped, etc., preferably rectangular or trapezoidal. Refer to the appendix Figures 4 to 7 . The rectangular or trapezoidal stop claws have a larger fitting area and are not easy to scratch the six sides of the nut. In addition, the number of stop claws 12 can be set to one or more according to actual needs.

[0029] The working principle of the present utility model is as follows: Install the valve stem assembly according to the structure shown in the appendix Figures 1 to 2 . Tighten the nut 11 and bend the stop claw 12 on the stop washer 8 upward until the stop claw 12 abuts against the hexagon of the nut 11. When rotating the handle 9, the handle 9 drives the stop washer 8 to rotate together. The stop claw 12 on the stop washer 8 limits the hexagon of the nut to prevent it from loosening reversely.

[0030] The basic principles and advantages of the present utility model have been described above. For those skilled in the art, the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, after reading this specification, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features therein. Without departing from the concept of the present utility model, any obvious replacements are within the protection scope of the present utility model.

Claims

1. A ball valve with an anti-loosening structure, characterized in that: The invention comprises a valve body (1), a valve stem (2) and a handle (9), wherein one end of the valve stem (2) is arranged in the valve body (1), and the other end extends from a valve stem channel (10) at the upper end of the valve body (1) to the outside of the valve body (1), wherein a lower packing pad (3), a packing (5) and an upper packing pad (4) which are sleeved on the valve stem (2) are arranged in the valve stem channel (10) from bottom to top, wherein a packing gland (6) is arranged on the upper packing gland (4), and the handle (9) is arranged on the packing gland (6), and the handle (9) is retained on the valve stem (2) by a nut (11) arranged at the upper end of the valve stem (2), a stop washer (8) is arranged between the nut (11) and the handle (9), and a bendable stop claw (12) is arranged on the stop washer (8), and when the nut (11) is tightened, the stop claw (12) is bent and pressed against the hexagon of the nut (11).

2. A ball valve with an anti-loosening structure according to claim 1, characterized in that: The stop washer (8) is provided with a handle limiting portion (14).

3. A ball valve with an anti-loosening structure according to claim 2, characterized in that: A valve stem spring (7) is also provided between the nut (11) and the handle (9), and the valve stem spring (7) is located below the stop washer (8).

4. A ball valve with an anti-loosening structure according to claim 3, characterized in that: The locking claw (12) is rectangular.

5. The ball valve with anti-loosening structure according to claim 3, characterized in that: The locking claw (12) is trapezoidal.

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