Buried non-rising stem type gate valve

Abstract

The utility model is suitable for the field of valve equipment, and provides a buried non-rising stem type gate valve which comprises a top support, an upper valve body and a main valve body which are sequentially and fixedly connected from top to bottom, the top support is provided with a rotating bearing, the top support is rotationally connected with a main valve rod through the rotating bearing, and the lower end of the main valve rod penetrates through the upper valve body to be arranged in the main valve body. The upper end of the main valve rod is higher than the upper end face of the top support, a valve body opening and closing indication mark is fixedly arranged on the outer side wall of the portion, higher than the upper end face of the top support, of the upper end of the main valve body, and a gate plate assembly is fixedly connected to the lower end of the main valve rod and comprises a sealing gate plate. A group of rotating bearings are arranged on the top bracket, and the main valve rod is limited and supported by the rotating bearings, so that long-time smooth rotation of the main valve rod can be ensured, and the problems of insufficient durability, valve rod deviation and the like caused by long-time hard contact between the main valve rod and the top bracket are solved.

Description

Technical Field

[0001] The utility model is applicable to the field of valve equipment and provides an underground concealed-stem gate valve. Background Art

[0002] A gate valve is a valve that uses the contact between the valve seat and the gate disc to seal, thereby controlling the opening and closing of the valve body. A buried gate valve is an opening and closing valve used for underground pipelines. Since its main valve body is located underground and the opening and closing operations of the gate valve need to be performed on the ground, the valve stem can be extended upward to the surface to facilitate the opening and closing of the valve. However, an excessively long valve stem will cause the valve stem to deviate due to the actual limit support after long-term use. This valve stem deviation will cause a gap between the gate disc and the valve seat, affecting the sealing effect. Some buried gate valves have an assembly hole on the upper part of the valve body that is compatible with the valve stem, and provide support for the valve stem through a direct hole-shaft contact sliding connection. However, this method will increase the rotational resistance of the valve stem after long-term use, making it difficult to use. Utility Model Content

[0003] To this end, the utility model provides an underground concealed-stem gate valve, which arranges a group of rotating bearings on the top bracket, and the top bracket is rotatably connected to the main valve stem through the rotating bearings. The rotating bearings not only provide the necessary limiting support for the main valve stem, but also ensure that the valve stem can rotate smoothly for a long time.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a buried concealed-stem gate valve, comprising a top bracket, an upper valve body and a main valve body fixedly connected in sequence from top to bottom, the top bracket being provided with a rotating bearing, the top bracket being rotatably connected to the main valve stem via the rotating bearing, the lower end of the main valve stem passing through the upper valve body and being arranged in the main valve body, the lower end of the main valve stem being fixedly connected to a gate assembly, the gate assembly comprising a sealing gate, the main valve body being provided with a valve body interface, a valve seat being fixedly provided in the valve body interface, the sealing gate being able to be controlled to fit or separate from the valve seat by rotating the main valve stem, thereby controlling the closing or opening of the valve body interface.

[0005] Furthermore, a stuffing groove extending from the interior of the upper valve body to the upper end surface of the upper valve body is provided between the upper portion of the upper valve body and the main valve stem, and the stuffing groove is filled with sealing stuffing.

[0006] Furthermore, a sealing pressing block is fixedly provided on the upper end surface of the upper valve body, and the sealing pressing block is used to seal the upper notch of the stuffing groove.

[0007] Furthermore, the upper end of the main valve stem is arranged higher than the upper end surface of the top bracket, and a valve body opening and closing indication mark is fixedly provided on the outer side wall of the part where the upper end of the main valve body is higher than the upper end surface of the top bracket.

[0008] Furthermore, the gate assembly also includes a gate connecting nut, which is fixedly connected to the sealing gate, and the gate connecting nut is threadedly screwed to the main valve stem. The outer side wall of the main valve stem is also threadedly screwed with an adjusting locking nut.

[0009] Furthermore, the number of the rotating bearings is at least two, and the multiple rotating bearings are coaxially arranged along the vertical direction.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. In the solution of the utility model, a set of rotating bearings is provided on the top bracket, and the main valve stem is installed on the top bracket through the rotating bearings. The rotating bearings not only provide the necessary limit support for the main valve stem, but also ensure the smooth rotation of the valve stem for a long time, thereby preventing the problems of insufficient durability and valve stem deviation caused by long-term hard contact between the two.

[0012] 2. The gate assembly and the valve stem are threadedly connected through the gate connecting nut. This structure facilitates the replacement of the gate and also facilitates fine-tuning of the position of the gate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a half-section schematic diagram of the structure of a buried concealed-stem gate valve mentioned in the present utility model;

[0014] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0015] Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle.

[0016] In the figure: 1. Main valve body, 11. Valve body interface, 12. Valve seat, 2. Upper valve body, 3. Top bracket, 4. Main valve stem, 41. Adjustment locking nut, 5. Gate assembly, 51. Gate connecting nut, 52. Sealing gate, 6. Sealing block, 7. Sealing packing, 8. Rotating bearing, 9. Valve body open and close indicator. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0018] Example 1, refer to the attached Figure 1The utility model provides a buried concealed stem gate valve, comprising a top bracket 3, an upper valve body 2 and a main valve body 1 fixedly connected in sequence from top to bottom. In order to facilitate disassembly, in this embodiment, the top bracket 3 and the upper valve body 2, and the upper valve body 2 and the main valve body 1 are connected by a detachable bolt fastening mechanism, as shown in the attached figure. Figure 2 As shown, the top bracket 3 is provided with two rotating bearings 8 arranged coaxially in the vertical direction. The top bracket 3 is rotatably connected to the main valve stem 4 through the two rotating bearings 8. The rotating bearings 8 not only provide the necessary limit support for the main valve stem 4, but also ensure the smooth rotation of the valve stem for a long time. The use of two coaxial rotating bearings 8 is to further improve the stability and prevent one of them from failing. The other can also work temporarily alone. The lower end of the main valve stem 4 passes through the upper valve body 2 and is arranged in the main valve body 1. The upper end of the main valve stem 4 is higher than the upper end surface of the top bracket 3. The main valve body 1 is used by the operator to rotate the main valve stem 4. The outer wall of the upper end of the main valve body 1 that is higher than the upper end surface of the top bracket 3 is fixedly provided with a valve body opening and closing indicator 9. The valve body opening and closing indicator 9 usually adopts a structure such as an arrow mark or a mark dot to intuitively indicate the current open and closed state of the entire gate valve. A stuffing groove extending from the interior of the upper valve body 2 to the upper end surface of the upper valve body 2 is provided between the upper part of the upper valve body 2 and the main valve stem 4. The stuffing groove is filled with sealing stuffing 7. A sealing pressure block 6 is fixedly provided on the upper end surface of the upper valve body 2. The sealing pressure block 6 is used to close the upper notch of the stuffing groove, as shown in the attached figure. Figure 3 As shown, the lower end of the main valve stem 4 is fixedly connected to the gate assembly 5, and the gate assembly 5 includes a sealing gate 52 and a gate connecting nut 51. The gate connecting nut 51 is fixedly connected to the sealing gate 52, and the gate connecting nut 51 is threadedly screwed to the main valve stem 4. The outer wall of the main valve stem 4 is also threadedly screwed with an adjusting locking nut 41. The main valve body 1 is provided with a valve body interface 11, and a valve seat 12 is fixedly provided in the valve body interface 11. By rotating the main valve stem 4, the sealing gate 52 can be controlled to fit or separate from the valve seat 12, thereby controlling the closing or opening of the valve body interface 11.

[0019] The buried concealed-stem gate valve in this embodiment is provided with a set of rotating bearings 8 on the top bracket 3, and the main valve stem 4 is provided with limiting support by the rotating bearings 8. Compared with the traditional sliding connection between the main valve stem 4 and the top bracket 3, this method can ensure the smooth rotation of the main valve stem 4 for a long time, and prevent the problems of insufficient durability and valve stem deviation caused by long-term hard contact between the two.

[0020] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0021] The above are merely preferred embodiments of the present invention. Anyone skilled in the art may utilize the above-described technical solutions to modify the present invention or create equivalent technical solutions. Therefore, any simple modification or equivalent replacement based on the technical solutions of the present invention falls within the scope of protection claimed by the present invention.

Claims

1. A buried concealed stem gate valve, characterized by: The utility model comprises a top bracket (3), an upper valve body (2) and a main valve body (1) which are fixedly connected in sequence from top to bottom, the top bracket (3) is provided with a rotating bearing (8), the top bracket (3) is rotatably connected to a main valve stem (4) via the rotating bearing (8), the lower end of the main valve stem (4) passes through the upper valve body (2) and is arranged in the main valve body (1), the lower end of the main valve stem (4) is fixedly connected to a gate assembly (5), the gate assembly (5) includes a sealing gate (52), the main valve body (1) is provided with a valve body interface (11), a valve seat (12) is fixedly arranged in the valve body interface (11), and the sealing gate (52) can be controlled to fit or separate from the valve seat (12) by rotating the main valve stem (4), thereby controlling the closing or opening of the valve body interface (11).

2. The buried concealed stem gate valve according to claim 1, characterized in that: A stuffing groove extending from the interior of the upper valve body (2) to the upper end surface of the upper valve body (2) is provided between the upper portion of the upper valve body (2) and the main valve stem (4), and the stuffing groove is filled with sealing stuffing (7).

3. The buried concealed stem gate valve according to claim 2, characterized in that: A sealing pressing block (6) is fixedly provided on the upper end surface of the upper valve body (2), and the sealing pressing block (6) is used to seal the upper notch of the stuffing groove.

4. The buried concealed stem gate valve according to claim 1, characterized in that: The upper end of the main valve stem (4) is arranged higher than the upper end surface of the top bracket (3), and a valve body opening and closing indication mark (9) is fixedly arranged on the outer side wall of the portion where the upper end of the main valve body (1) is higher than the upper end surface of the top bracket (3).

5. The buried concealed stem gate valve according to claim 1, characterized in that: The gate assembly (5) further comprises a gate connecting nut (51), wherein the gate connecting nut (51) is fixedly connected to the sealing gate (52), the gate connecting nut (51) is threadedly connected to the main valve stem (4), and the outer side wall of the main valve stem (4) is also threadedly connected to an adjusting locking nut (41).

6. The buried concealed stem gate valve according to claim 1, characterized in that: The number of the rotating bearings (8) is at least two, and the plurality of rotating bearings (8) are coaxially arranged in the vertical direction.

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