Stainless steel stop valve

Abstract

The utility model discloses a stainless steel stop valve, which belongs to the technical field of stop valves, and comprises a valve body, a valve cover fixed on the valve body through a bolt, and a valve rod arranged on the valve cover, a medium channel is arranged in the valve cover, the lower end of the valve rod is rotatably connected with a valve core, and the lower end of the valve core is provided with a boss in wedge fit with the inner wall of the medium channel. The surface of the valve rod is sleeved with a stainless steel corrugated pipe. Compared with the prior art, the stainless steel stop valve has the advantages that the stainless steel corrugated pipe is connected through the first connecting flange and the second connecting flange to form the closed cavity, so that media can be prevented from entering the stainless steel corrugated pipe, dynamic sealing leakage can be further avoided, and after the valve cover and the valve body are detached, the sealing effect is good. The valve rod, the valve element and the stainless steel corrugated pipe can be directly taken out together, the two ends of the stainless steel corrugated pipe are fixedly connected with the upper end of the valve element and the lower end of the valve deck through the first connecting flange and the second connecting flange respectively, and therefore the stainless steel corrugated pipe can be replaced conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology, and in particular relates to a stainless steel gate valve. Background Technology

[0002] In the field of valve equipment technology, the gate valve, as a forced sealing valve, has a sealing performance that is directly related to the safe operation of industrial pipelines.

[0003] Traditional gate valves suffer from the following technical defects: Most traditional gate valves use packing for sealing, but the dynamic seal between the valve stem and the packing gland is prone to leakage due to media corrosion or wear. To address these defects, we propose a stainless steel gate valve. Utility Model Content

[0004] The purpose of this utility model is to provide a stainless steel gate valve to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: A stainless steel gate valve includes a valve body, a valve cover fixed to the valve body by bolts, and a valve stem disposed on the valve cover. The valve cover has a medium channel inside. A valve core is rotatably connected to the lower end of the valve stem. A boss that wedges with the inner wall of the medium channel is provided at the lower end of the valve core. A stainless steel bellows is sleeved on the surface of the valve stem. The two ends of the stainless steel bellows are fixedly connected to the upper end of the valve core and the lower end of the valve cover by a first connecting flange and a second connecting flange, respectively.

[0006] Preferably, a first sealing ring is provided between the first connecting flange and the valve core, and a second sealing ring is provided between the second connecting flange and the valve cover.

[0007] Preferably, the sealing surfaces of the valve cover and the valve body are provided with a third sealing ring.

[0008] Preferably, the wedge-shaped surface of the boss has an inclination angle of 5-10 degrees.

[0009] Preferably, the stainless steel corrugated pipe has a wall thickness of 0.5-0.8 mm and a corrugation number of 15-18.

[0010] The stainless steel gate valve of this utility model has the following advantages:

[0011] This stainless steel gate valve features a stainless steel bellows connected by a first connecting flange and a second connecting flange to form a closed cavity. This prevents the medium from entering the stainless steel bellows, thus avoiding dynamic sealing leakage. Furthermore, after separating the valve cover from the valve body, the valve stem, valve core, and stainless steel bellows can be directly removed together. The two ends of the stainless steel bellows are fixedly connected to the upper end of the valve core and the lower end of the valve cover via the first connecting flange and the second connecting flange, respectively, facilitating the replacement of the stainless steel bellows. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the orthographic section of the present invention;

[0015] Figure 3 This is a three-dimensional structural diagram of the valve cover of this utility model;

[0016] Figure 4 for Figure 2 Enlarged structural diagram at point A in the middle.

[0017] The markings in the diagram are as follows: 1 Valve body, 2 Valve cover, 21 Medium passage, 22 Third sealing ring, 3 Valve stem, 4 Valve core, 41 Boss, 5 Stainless steel bellows, 51 First connecting flange, 52 Second connecting flange, 53 First sealing ring, 54 Second sealing ring. Detailed Implementation

[0018] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0019] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0022] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0023] To better understand the purpose, structure, and function of this utility model, a stainless steel gate valve of this utility model will be described in further detail below with reference to the accompanying drawings.

[0024] like Figure 1-3 As shown, a stainless steel gate valve of this utility model includes a valve body 1, a valve cover 2 fixed to the valve body 1 by bolts, and a valve stem 3 set on the valve cover 2. A knob is fixedly installed on the upper end of the valve stem 3 by bolts. A third sealing ring 22 is provided on the sealing surface between the valve cover 2 and the valve body 1. The third sealing ring 22 can be used to seal the assembly surface between the valve body 1 and the valve cover 2. A medium channel 21 is provided inside the valve cover 2. A valve core 4 is rotatably connected to the lower end of the valve stem 3. A boss 41 with a wedge-shaped fit with the inner wall of the medium channel 21 is provided at the lower end of the valve core 4. The wedge-shaped surface of the boss 41 has an inclination angle of 5-10 degrees. The valve stem 3 transmits axial pressure to the valve core 4 through rotation, so that the wedge-shaped surface of the boss 41 forms a line contact seal with the inner wall of the medium channel 21.

[0025] A stainless steel bellows 5 is fitted onto the surface of the valve stem 3. The wall thickness of the stainless steel bellows 5 is 0.5-0.8 mm, and the number of bellows is 15-18. The two ends of the stainless steel bellows 5 are fixedly connected to the upper end of the valve core 4 and the lower end of the valve cover 2 through a first connecting flange 51 and a second connecting flange 52, respectively. A first sealing ring 53 is provided between the first connecting flange 51 and the valve core 4, and a second sealing ring 54 is provided between the second connecting flange 52 and the valve cover 2. The first sealing ring 53 prevents the medium from permeating into the interior of the stainless steel bellows 5 from the connection between the valve core 4 and the first connecting flange 51, and the second sealing ring 54 prevents the medium from permeating into the interior of the stainless steel bellows 5 from the connection between the valve cover 2 and the second connecting flange 52. The connecting surface enters the stainless steel bellows 5, thereby isolating the valve stem 3 from the valve body 1. When the medium enters the valve body 1, the medium cannot leak out of the valve body 1 through the gap between the valve stem 3 and the valve cover 2, thus avoiding leakage of the shut-off valve. The stainless steel bellows 5 forms a closed cavity through the connection of the first connecting flange 51 and the second connecting flange 52. When the valve stem 3 moves, it drives the stainless steel bellows 5 to expand and contract. The 15-18 bellows structure provides axial compensation capability, avoiding dynamic sealing leakage. After the valve cover 2 is separated from the valve body 1, the valve stem 3, valve core 4 and stainless steel bellows 5 can be directly removed together, thus facilitating the replacement of the stainless steel bellows 5.

[0026] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A stainless steel gate valve, comprising a valve body (1), a valve cover (2) bolted to the valve body (1), and a valve stem (3) disposed on the valve cover (2), characterized in that: The valve cover (2) has a medium channel (21) inside. The valve stem (3) is rotatably connected to the valve core (4). The valve core (4) has a boss (41) at the lower end that wedges with the inner wall of the medium channel (21). The surface of the valve stem (3) is fitted with a stainless steel bellows (5). The two ends of the stainless steel bellows (5) are fixedly connected to the upper end of the valve core (4) and the lower end of the valve cover (2) through the first connecting flange (51) and the second connecting flange (52) respectively.

2. The stainless steel gate valve according to claim 1, characterized in that: A first sealing ring (53) is provided between the first connecting flange (51) and the valve core (4), and a second sealing ring (54) is provided between the second connecting flange (52) and the valve cover (2).

3. A stainless steel gate valve according to claim 1, characterized in that: The valve cover (2) and the valve body (1) are provided with a third sealing ring (22).

4. A stainless steel gate valve according to claim 1, characterized in that: The wedge-shaped surface of the boss (41) has an inclination angle of 5-10 degrees.

5. A stainless steel gate valve according to claim 1, characterized in that: The stainless steel corrugated pipe (5) has a wall thickness of 0.5-0.8 mm and a corrugation number of 15-18.

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