Forged steel gate valve

Abstract

A forged steel gate valve is characterized in that a positioning boss is formed on the inner wall of a valve hole; a limiting boss is formed on the outer side wall of the head of the valve seat, the tail of the valve seat is bent outwards to form a turnup, and the limiting boss and the turnup of the valve seat are arranged at the two ends of a positioning boss respectively and are in limiting fit with the positioning boss. By the adoption of the scheme, the limiting boss is formed on the head of the valve seat, the tail of the valve seat is bent to form the turnup, the valve seat and the positioning boss in the valve hole can form reliable limiting, the valve seat cannot loosen due to thermal expansion and cold contraction, the problem that the valve seat is rushed out is effectively avoided, the structure is more stable, and work is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a forged steel gate valve. Background Art

[0002] Forged steel gate valves are widely used in the petrochemical industry. At present, the valve seat of forged steel gate valves is usually fixed in the valve hole of the valve body by interference fit. For example, a forged steel gate valve with a hard sealing valve seat is disclosed in the Chinese utility model patent (CN 209084045U).

[0003] However, this valve seat fixing method may cause the valve seat to loosen under high and low temperature conditions due to the thermal expansion and contraction of the material itself. Once the valve seat is loose, the valve seat may be flushed out of the valve hole under the action of the medium pressure, causing the valve seat to be retained in the valve body, affecting the normal opening and closing of the gate, resulting in the valve being unable to close, which may easily cause safety accidents. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the utility model provides a forged steel gate valve.

[0005] The technical solution adopted by the utility model is: a forged steel gate valve, comprising:

[0006] A valve body, comprising a central cavity and valve holes located on both sides of the central cavity;

[0007] A valve cover, which is fixedly mounted on the upper end of the valve body;

[0008] A valve seat is arranged in the valve holes on both sides of the middle cavity of the valve body;

[0009] a gate plate disposed in the middle cavity;

[0010] The valve stem, one end of which is connected to the gate, and the other end extends out of the valve cover and is connected to the operating part;

[0011] A positioning boss is formed on the inner wall of the valve hole; a limiting boss is formed on the outer wall of the valve seat head, and the tail of the valve seat is bent outward to form a flange. The limiting boss and the flange of the valve seat are respectively arranged at both ends of the positioning boss and form a limiting match therewith.

[0012] An interference fit is formed between the valve seat and the positioning boss.

[0013] The inner side wall of the flange is in an arc-shaped structure.

[0014] The gate plate is in a wedge-shaped structure.

[0015] A metal spiral wound gasket is arranged between the valve cover and the valve body.

[0016] A sealing packing assembly is arranged between the valve cover and the valve stem.

[0017] The beneficial effect of the utility model is that: by adopting the above scheme, a limiting boss is formed on the head of the valve seat, and the tail of the valve seat is bent to form a flange, so that the valve seat can form a reliable limit with the positioning boss in the valve hole, the valve seat will not loosen due to thermal expansion and contraction, and the problem of the valve seat being punched out is effectively avoided. The structure is more stable and the operation is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a forged steel gate valve according to an embodiment of the utility model.

[0019] Figure 2 for Figure 1 A magnified schematic diagram of center A.

[0020] Figure 3 This is a schematic diagram of the installation principle of the valve seat in the embodiment of the utility model. DETAILED DESCRIPTION

[0021] The embodiments of the utility model are further described below in conjunction with the accompanying drawings.

[0022] like Figure 1-2 As shown, a forged steel gate valve includes a valve body 1, a valve cover 2, a valve seat 3, a gate plate 4, and a valve stem 5.

[0023] The valve body 1 is formed with a central cavity 11 and valve holes 12 located on both sides of the central cavity. The inner wall of the valve hole 12 is formed with an annular positioning boss 13 .

[0024] The valve cover 2 is fixedly mounted on the upper end of the valve body 1 , the valve cover 2 and the valve body 1 are fixed and locked by screws, and a metal spiral wound gasket 6 is provided between the valve body 1 and the valve cover 2 to ensure a reliable seal therebetween.

[0025] The valve seats 3 are provided with two, and are respectively arranged in the valve holes 12 on both sides of the middle cavity of the valve body, and are interference fit with the positioning boss 13. In addition, the outer wall of the head of the valve seat 3 forms a limiting boss 31, and the tail of the valve seat 3 is bent outward to form a flange 32. The limiting boss 31 and the flange 32 of the valve seat 3 are respectively arranged at both ends of the positioning boss 13, and form a limiting fit with it.

[0026] When installing the valve seat 3, first place the valve seat 3 in the valve hole 12, then use a punch tool with the same size as the gate to hydraulically expand the valve seat and the valve hole together, and finally use Figure 3 The valve seat tail punch tool shown uses a hydraulic press to fold the valve seat tail to form a flange, so that it is tightly buckled with the positioning boss on the inner side of the valve hole and will not loosen. The valve seat production and assembly is very convenient, does not increase additional costs, and is economical and practical.

[0027] The gate plate 4 is arranged in the middle cavity 11, and when the valve is closed, the gate plate 4 can be sealed with the sealing surface of the head of the valve seat 3. The gate plate 4 is a wedge-shaped structure, which further ensures reliable sealing between the gate plate 4 and the valve seat 3.

[0028] One end of the valve stem 5 is connected to the gate plate 4, and the other end extends out of the valve cover 2 and is connected to the operating component. A sealing packing assembly 7 is provided between the valve cover 2 and the valve stem 5 to ensure a reliable seal between the valve stem 5 and the valve cover 2.

[0029] The operating component includes a bracket, a hand wheel, and a valve stem nut. Through the threaded cooperation with the valve stem, the rotation of the hand wheel drives the lifting and lowering of the valve stem.

[0030] With the above solution, the valve seat head forms a limiting boss, and the valve seat tail is bent to form a flange. In addition to the interference fit between the valve seat and the positioning boss, a reliable limiting fit is formed between the valve seat and the positioning boss. Therefore, the valve seat will not loosen due to thermal expansion and contraction, effectively avoiding the problem of the valve seat being flushed out, and the structure is more stable, and the operation is safer and more reliable. In addition, the inner side wall of the flange 32 is an arc-shaped structure. During the flow of the medium, the force of the medium will not cause the deformation of the flange 32, and the structure is also more stable.

[0031] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0033] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept of the utility model is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent right.

Claims

1. A forged steel gate valve, comprising: A valve body (1), comprising a central cavity (11) and valve holes (12) located on both sides of the central cavity; A valve cover (2) fixedly mounted on the upper end of the valve body (1); A valve seat (3) disposed in the valve hole (12) on both sides of the central cavity of the valve body; A gate plate (4) disposed in the middle cavity (11); A valve stem (5), one end of which is connected to the gate plate (4), and the other end of which extends out of the valve cover (2) and is connected to an operating component; The invention is characterized in that: a positioning boss (13) is formed on the inner wall of the valve hole (12); a limiting boss (31) is formed on the outer wall of the head of the valve seat (3); the tail of the valve seat (3) is bent outward to form a flange (32); the limiting boss (31) and the flange (32) of the valve seat (3) are respectively arranged at two ends of the positioning boss (13) and form a limiting cooperation with the positioning boss (13).

2. The forged steel gate valve according to claim 1, characterized in that: The inner side wall of the flange (32) is in an arc-shaped structure.

3. The forged steel gate valve according to claim 1, characterized in that: An interference fit is formed between the valve seat (3) and the positioning boss (13).

4. The forged steel gate valve according to claim 1, characterized in that: The gate plate (4) has a wedge-shaped structure.

5. The forged steel gate valve according to claim 1, characterized in that: A metal spiral wound gasket (6) is provided between the valve cover (2) and the valve body (1).

6. The forged steel gate valve according to claim 1, characterized in that: A sealing packing assembly (7) is provided between the valve cover (2) and the valve stem (5).

Images