Stop valve

Abstract

The utility model discloses a stop valve which comprises a valve body, a replaceable valve seat and a valve rod, a central flow channel is arranged in the valve body, a cavity is arranged at the bottom of the central flow channel in the valve body, the valve seat is arranged in the cavity of the valve body, the valve body is connected with a support, the valve rod is inserted into the valve body and connected with the replaceable valve seat, and a nut is arranged in the support. One end of the valve rod is exposed out of the support and provided with a handle, a valve clack is arranged on the lower portion of a center flow channel in the valve body, a hard alloy layer is arranged on the end face of the replaceable valve seat, a sealing face is arranged on the replaceable valve seat and makes contact with the valve clack in an attached mode, and a pressing piece is arranged on the side edge of a cavity in the valve body. And the pressing piece is pressed against the replaceable valve seat to fasten the replaceable valve seat in the cavity of the valve body. The valve seat is convenient to replace, unnecessary waste is avoided, cost is saved, efficiency is improved, and loss is reduced.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to a globe valve with a replaceable valve seat. Background Art

[0002] As a control device, valves are widely used in fluid and gas control. In the gas transportation working condition, globe valves are mostly used because of the structure of the globe valve itself which is beneficial to sealing. For many existing globe valves, the valve body is usually processed into a valve seat sealing surface by surfacing hard seat alloy. In actual use, the valve seat sealing surface is scratched and impacted, which may lead to the situation of incomplete sealing. At this time, only the whole valve can be replaced, resulting in a large cost waste. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a globe valve with a replaceable valve seat.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A globe valve includes a valve body, a replaceable valve seat and a valve stem. The valve body has a central flow channel. A cavity is provided at the bottom of the central flow channel in the valve body. The valve seat is installed in the cavity of the valve body. The valve body is connected with a bracket. The valve stem is inserted into the valve body and connected with the replaceable valve seat. A nut is provided in the bracket. The valve stem passes through and is assembled with the nut. One end of the valve stem is exposed outside the bracket and is equipped with a handle. A valve flap is provided at the lower part of the central flow channel in the valve body. The end face of the replaceable valve seat is provided with a cemented carbide layer. The replaceable valve seat is provided with a sealing surface, which is in contact with the valve flap. A pressing member is provided at the side edge of the cavity in the valve body, and the pressing member presses against the replaceable valve seat to fix the replaceable valve seat in the cavity of the valve body.

[0006] Further, the sealing surface on the replaceable valve seat is an inclined surface, and the lower part of the valve flap is provided with an inclined surface. The inclined surface of the valve flap and the sealing surface of the replaceable valve seat have the same inclination.

[0007] Further, a sealing groove is provided in the replaceable valve seat. A convex surface is provided at the corresponding position in the valve body for the sealing groove. A sealing ring is embedded in the sealing groove. The convex surface abuts against the port of the sealing groove to form a sealed cavity in the sealing groove.

[0008] Further, the pressing member is a convex platform formed on the side edge of the cavity of the valve body.

[0009] Further, the convex platform is annular and is arranged around the cavity of the valve body in a circle.

[0010] Further, a packing assembly is provided on the inner side of the bracket. The packing assembly fits against the surface of the valve stem. A packing gland is provided on the packing assembly, and a packing plate is provided on the packing gland. The packing plate is locked and installed on the bracket by bolts.

[0011] Further, the boss is made of metal material.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] The valve seat is tightly fixed by the pressing member. When disassembling the valve seat, only a tool is needed to bend the pressing member so that it no longer presses on the valve seat, and then the valve seat can be taken out for replacement. There is no need to replace the whole valve, which saves costs and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic cross-sectional structure diagram of the utility model;

[0015] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0016] Figure 3 is Figure 2 a top view structure diagram of

[0017] Figure 4 is a schematic structure diagram of the cavity of the valve seat in the utility model without the valve seat assembled.

[0018] Reference numerals:

[0019] Valve body 1, valve flap 2, valve stem 3, packing assembly 4, packing gland 5, packing plate 6, bracket 7, nut 8, handle 9, replaceable valve seat 10, sealing surface 11, sealing ring 12, convex surface 13, pressing member 14, cavity 15. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 cannot be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Refer to Figures 1-4 As shown, a globe valve includes a valve body 1, a replaceable valve seat 10, and a valve stem 3. The valve body 1 has a central flow channel. A cavity 15 is provided at the bottom of the central flow channel inside the valve body 1. The valve seat 10 is installed in the cavity 15 of the valve body 1. The valve body 1 is connected with a bracket 7. The valve stem 3 is inserted into the valve body 1. A nut 8 is provided inside the bracket 7. The valve stem 3 passes through and is assembled with the nut 8. One end of the valve stem 3 is exposed outside the bracket 7 and a handle 9 is installed. A valve flap 2 is provided at the lower part of the central flow channel inside the valve body 1. The bottom of the valve stem 3 extends to the valve flap 2. The end face of the replaceable valve seat 10 is provided with a cemented carbide layer. A sealing surface 11 is provided on the replaceable valve seat 10, and the material of this sealing surface is cemented carbide. This sealing surface 11 is in fitting contact with the valve flap 2. A pressing member 14 is provided at the side edge of the cavity 15 inside the valve body 1. This pressing member 14 presses against the replaceable valve seat 10 to fix the replaceable valve seat 10 tightly in the cavity 15 of the valve body 1. By using a tool, the pressing member can be pried open, so that the replaceable valve seat can be taken out. With this detachable structure for assembling the replaceable valve seat, when there are problems such as scratches on the sealing surface of the replaceable valve seat, the replaceable valve seat can be taken out and replaced alone, instead of replacing the entire valve, saving costs.

[0024] The sealing surface on the replaceable valve seat 10 is an inclined surface, and the lower part of the valve flap 2 is provided with an inclined surface. The inclined surface of the valve flap and the sealing surface of the replaceable valve seat have the same inclination. The sealing surface of the replaceable valve seat requires a certain inclination angle to ensure better fitting and sealing with the valve flap.

[0025] A sealing groove is provided in the replaceable valve seat 10, and a convex surface 13 is provided at the position corresponding to the sealing groove in the valve body 1. A sealing ring 12 is embedded in the sealing groove, and the convex surface 13 abuts against the port of the sealing groove to form a sealed cavity in the sealing groove. The sealing ring can be made of different materials according to different media and temperature conditions. Commonly used ones are flexible graphite, PTFE, vermiculite, etc. The sealing ring is placed in the sealed cavity formed by the combination of the sealing groove of the valve seat and the convex surface of the valve body to achieve the sealing between the valve seat and the valve body.

[0026] The pressing member 14 is a convex platform formed on the side edge of the valve body cavity. The convex platform is annular and surrounds the cavity for one circle. When not assembled, the convex platform is in a vertical state. Refer to Figure 4 as shown; after placing the valve seat in the cavity of the valve body, since the convex platform is a circle, it is not necessary to bend the entire circle of the convex platform to press the valve seat. Only need to cut several sections through a tool or other tooling, and then bend and deform them individually to press the valve seat surface, so as to fix the valve seat. The valve seat is fixed by pressing with four convex platforms to ensure uniform force. The convex platform is made of metal material and is not easy to rebound after bending.

[0027] A packing assembly 4 is provided on the inner side of the bracket 7. The packing assembly 4 fits on the surface of the valve stem 3. A packing gland 5 is provided on the packing assembly 4, and a packing plate 6 is provided on the packing gland 5. The packing plate 6 is locked and installed on the bracket through bolts.

[0028] In the case of scratches on the sealing surface of the valve seat, only need to use a corresponding tool or tooling to remove the originally pressed and deformed convex platform, then the valve seat can be taken out, replace the new valve seat, adjust the position, and at the part of the convex platform different from the original, use a tool to press the convex platform towards the valve seat to fix the valve seat on the valve body to complete the replacement.

[0029] It should be noted that the above is only the preferred embodiment of the present invention and is not used to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A globe valve, comprising a valve body, a replaceable valve seat and a valve stem, characterized in that, The valve body has a central flow passage. A cavity is provided at the bottom of the central flow passage inside the valve body. The valve seat is installed in the cavity of the valve body. The valve body is connected with a bracket. The valve stem is inserted into the valve body and connected with the replaceable valve seat. A nut is provided inside the bracket, and the valve stem passes through and is assembled with the nut. One end of the valve stem is exposed outside the bracket and is equipped with a handle. A valve flap is provided at the lower part of the central flow passage inside the valve body. The end face of the replaceable valve seat is provided with a cemented carbide layer. The replaceable valve seat is provided with a sealing surface, and this sealing surface is in fitting contact with the valve flap. A pressing member is provided at the side edge of the cavity inside the valve body, and this pressing member presses against the replaceable valve seat to fix the replaceable valve seat tightly in the cavity of the valve body.

2. The globe valve according to claim 1, wherein The sealing surface on the replaceable valve seat is an inclined surface. An inclined surface is provided at the lower part of the valve flap, and the inclined surface of the valve flap and the sealing surface of the replaceable valve seat have the same inclination.

3. The globe valve according to claim 1, characterized in that, A sealing groove is provided inside the replaceable valve seat. A convex surface is provided at the corresponding position of the sealing groove inside the valve body. A sealing ring is embedded in the sealing groove, and the convex surface abuts against the port of the sealing groove to form a sealed cavity for the sealing groove.

4. The globe valve according to claim 1, wherein, The pressing member is a convex platform formed on the side edge of the cavity of the valve body.

5. The globe valve according to claim 4, wherein, The convex platform is annular and is arranged around the cavity of the valve body in a circle.

6. The globe valve according to claim 1, wherein A packing assembly is provided on the inner side surface of the bracket. This packing assembly fits against the surface of the valve stem. A packing gland is provided on the packing assembly, and a packing plate is provided on the packing gland. The packing plate is locked and installed with the bracket through bolts.

7. The globe valve according to claim 4, wherein, The convex platform is made of metal material.

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