Top-mounted valve with valve seat convenient to disassemble and assemble

Abstract

The top-mounted valve comprises a valve body, a valve rod, a valve element and the valve seat, the valve element is located in the valve body and connected with the valve rod, the valve seat is located in the valve body and matched with the valve element to form a sealing pair, the valve body is a top-mounted valve body, an upper valve cover matched with the valve body is arranged at the upper end of the valve body, and a lower valve cover matched with the valve cover is arranged at the lower end of the valve body. A stepped hole is formed in an inner channel opening of the valve body, a hanging ring is installed in the stepped hole, the valve seat is installed in the hanging ring and abuts against the bottom face of the stepped hole, an annular check ring for limiting axial movement of the hanging ring is arranged on the side wall of the stepped hole, and a pressing ring for pressing the valve seat is arranged on the outer side of the annular check ring and connected with the hanging ring through a bolt. An access hole does not need to be formed independently, the weight of the valve body is reduced, and leakage points are reduced; the overall length of the valve body is reduced, so that the leakage possibility caused by deformation due to temperature difference change is reduced; the internal valve core, the compression ring and the valve seat can be assembled and disassembled on line, and compared with an ultra-low temperature valve with a side-mounted access hole, the ultra-low temperature valve has obvious advantages.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to a top-mounted valve with a valve seat that is easy to disassemble and assemble, and belongs to the technical field of valves. Background Art

[0002] Valves are control components in fluid delivery systems, with functions such as shutoff, regulation, flow diversion, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves used in fluid control systems come in a wide variety of varieties and specifications, from the simplest shutoff valves to the various valves used in extremely complex automatic control systems. Valves can be used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media.

[0003] The country develops clean energy to gradually replace the more polluting traditional energy, especially liquefied natural gas (LNG) and liquefied petroleum gas as an emerging energy source. At the same time, more similar ultra-low temperature working media are derived, among which LNG, CNG, liquid oxygen, liquid nitrogen and liquid hydrogen are the most widely used. With the increase in demand for ultra-low temperature valves, the structural design and process design must also be able to meet the new working conditions.

[0004] There are two common methods for assembling the valve body and valve seat of traditional valves. The first method is welding, which involves surfacing a stainless steel layer on the sealing surface of the valve body or welding a stainless steel ring to the sealing surface to form a valve seat, and then processing it to the size and roughness required by the design. The second method is mechanical fixing, which involves fixing the stainless steel valve seat to the valve body mechanically. The valve seats of the above two methods have low installation efficiency when working online, and it is inconvenient to replace the valve seat when it is worn. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a top-mounted valve with a valve seat that is easy to disassemble and assemble, and in which the valve seat can be replaced quickly and conveniently online.

[0006] To this end, the utility model adopts the following technical solutions:

[0007] A top-mounted valve with an easy-to-disassemble valve seat comprises a valve body, a valve stem, a valve core and a valve seat, the valve core is located in the valve body and connected to the valve stem, the valve seat is located in the valve body and cooperates with the valve core to form a sealing pair, the valve body is a top-mounted valve body, an upper valve cover is provided on the upper end of the valve body to cooperate with the valve core, a stepped hole is provided at the inner channel opening of the valve body, a lifting ring is installed in the stepped hole, the valve seat is installed in the lifting ring and contacts the bottom surface of the stepped hole, an annular retaining ring is provided on the side wall of the stepped hole to limit the axial movement of the lifting ring, a pressing ring is provided on the outer side of the annular retaining ring to press the valve seat, and the pressing ring is connected to the lifting ring by bolts.

[0008] As an optimal technical solution for a top-mounted valve that is easy to disassemble and assemble the valve seat, a self-cleaning ring is provided between the pressure ring and the valve seat, the outer diameter of the self-cleaning ring is provided with a flange, the outer end surface of the valve seat is provided with a concave cavity for accommodating the self-cleaning ring, the bottom surface of the concave cavity is provided with an annular cavity for accommodating the flange, and the inner diameter surface of the self-cleaning ring is in contact with the sealing surface of the valve core.

[0009] As a preferred technical solution of the top-mounted valve of the utility model which is easy to disassemble and assemble the valve seat, a limit ring is provided on the outer diameter of the inner end of the lifting ring, and the limit ring is located between the annular retaining ring and the bottom surface of the stepped hole.

[0010] As an optimal technical solution for a top-mounted valve that is easy to disassemble and assemble the valve seat of the utility model, an annular boss is provided on the inner end face of the pressure ring, and the annular boss is located between the outer diameter of the annular retaining ring and the valve seat. A plurality of countersunk holes penetrating the annular boss are provided on the outer end face of the pressure ring, and the bolts are located in the countersunk holes and fixedly connected to the lifting ring.

[0011] As a preferred technical solution of the top-mounted valve of the utility model which is convenient for disassembling and assembling the valve seat, the lifting ring is composed of two or three sections of arc-shaped plates connected end to end.

[0012] As a preferred technical solution of a top-mounted valve that is easy to disassemble and assemble the valve seat of the utility model, the arc plates are connected by a dovetail groove connection.

[0013] As a preferred technical solution of the top-mounted valve of the utility model which is easy to disassemble and assemble the valve seat, a retaining spring is provided in the countersunk hole to prevent the bolt from falling off.

[0014] As a preferred technical solution of a top-mounted valve that is easy to disassemble and assemble the valve seat of the utility model, the inner end face of the pressure ring contacts the outer end face of the annular retaining ring, the outer end face of the valve seat and the self-cleaning ring.

[0015] As a preferred technical solution of a top-mounted valve of the utility model that is easy to disassemble and assemble the valve seat, the valve core is a butterfly plate or a sphere.

[0016] The beneficial effects of the utility model are:

[0017] The utility model has a simple structure and is easy and quick to operate. When internal maintenance is needed, the upper valve cover can be opened to enter the warehouse for maintenance or replacement of internal parts. Compared with the side-mounted valve, the utility model does not need to open a separate maintenance hole, which reduces the weight of the valve body and also reduces the leakage points. The overall length of the valve body is reduced, so the possibility of leakage caused by deformation due to temperature difference changes is reduced. The internal valve core, pressure ring and valve seat of the utility model can be disassembled and assembled online, which has obvious advantages compared with the ultra-low temperature valve with a side-mounted maintenance port. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a structural schematic diagram of the utility model.

[0019] Figure 2 yes Figure 1 A partial enlarged view of middle A.

[0020] Figure 3 It is a structural diagram of the lifting ring.

[0021] In the figure: 1. valve body; 2. valve stem; 3. valve core; 4. valve seat; 5. upper valve cover; 6. lifting ring; 7. annular retaining ring; 8. pressure ring; 9. bolt; 10. self-cleaning ring; 11. flange; 12. limit ring; 13. annular boss; 14. arc plate; 15. retaining ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Reference Figure 1-3 A top-mounted valve that is easy to disassemble and assemble a valve seat, comprising a valve body 1, a valve stem 2, a valve core 3 and a valve seat 4, wherein the valve core 3 is located in the valve body 1 and connected to the valve stem 2, the valve seat 4 is located in the valve body 1 and cooperates with the valve core 3 to form a sealing pair, the valve body 1 is a top-mounted valve body, the upper end of the valve body 1 is provided with an upper valve cover 5 that cooperates with it, a stepped hole is provided at the inner channel opening of the valve body 1, a lifting ring 6 is installed in the stepped hole, the valve seat 4 is installed in the lifting ring 6 and contacts the bottom surface of the stepped hole, an annular retaining ring 7 is provided on the side wall of the stepped hole to limit the axial movement of the lifting ring 6, the annular retaining ring 7 and the valve body 1 are an integral structure, and a pressing ring 8 for pressing the valve seat 4 is provided on the outer side of the annular retaining ring 7, and the pressing ring 8 is connected to the lifting ring 6 by a bolt 9.

[0024] As an optimal technical solution for a top-mounted valve that is easy to disassemble and assemble the valve seat of the utility model, a self-cleaning ring 10 is provided between the pressure ring 8 and the valve seat 4, and the outer diameter of the self-cleaning ring 10 is provided with a flange 11, and the outer end surface of the valve seat 4 is provided with a concave cavity for accommodating the self-cleaning ring 10, and the bottom surface of the concave cavity is provided with an annular cavity for accommodating the flange 11, and the inner diameter surface of the self-cleaning ring 10 is in contact with the sealing surface of the valve core 3, which can effectively scrape off impurities on the sealing surface of the valve core 3, ensure that there is no impurity seal between the valve seat and the valve core, and improve the sealing performance.

[0025] As an optimal technical solution for a top-mounted valve that is easy to disassemble and assemble the valve seat, a limit ring 12 is provided on the inner outer diameter of the lifting ring 6. The limit ring 12 is located between the annular retaining ring 7 and the bottom surface of the stepped hole to limit the axial movement of the lifting ring 6.

[0026] As an optimal technical solution for a top-mounted valve that is easy to disassemble and assemble the valve seat of the utility model, an annular boss 13 is provided on the inner end face of the pressure ring 8, and the annular boss 13 is located between the outer diameter of the annular retaining ring 7 and the valve seat 4. A plurality of countersunk holes penetrating the annular boss 13 are provided on the outer end face of the pressure ring 8, and a plurality of threaded holes corresponding to the countersunk holes are provided on the outer end face of the lifting ring 6. The bolt 9 is located in the countersunk hole and is threadedly connected to the threaded hole of the lifting ring 6, and the bolt 6 adopts a hexagon socket bolt.

[0027] As a preferred technical solution of the top-mounted valve of the utility model which is convenient for disassembling and assembling the valve seat, the lifting ring 6 is composed of two or three sections of arc-shaped plates 14 connected end to end, so as to facilitate the disassembly and assembly of the lifting ring 6.

[0028] As a preferred technical solution of the top-mounted valve of the utility model which is convenient for disassembling and assembling the valve seat, the arc plates 14 are connected by dovetail groove connection.

[0029] As a preferred technical solution for a top-mounted valve that is easy to disassemble and assemble the valve seat of the utility model, a retaining ring 15 is provided in the countersunk hole to prevent the bolt 9 from falling off, so as to avoid affecting the normal operation of the valve.

[0030] As a preferred technical solution of a top-mounted valve that is easy to disassemble and assemble the valve seat of the utility model, the inner end surface of the pressure ring 8 contacts the outer end surface of the annular retaining ring 7, the outer end surface of the valve seat 4 and the self-cleaning ring 10.

[0031] As a preferred technical solution of the top-mounted valve of the utility model which is easy to disassemble and assemble the valve seat, the valve core 3 is a butterfly plate or a sphere.

[0032] During the installation process, first install the lifting ring on the inner side of the annular retaining ring in the valve body, install the valve seat in the lifting ring, install the self-cleaning ring in the concave cavity on the outer end face of the valve seat, and then install the pressure ring in the valve body. The bolts pass through the countersunk holes and are threadedly connected with the threaded holes on the lifting ring. The self-cleaning ring and the valve seat are locked, and a retaining ring is installed in the countersunk hole to prevent the bolts from loosening and falling into the valve body and affecting normal operation. Then install the valve core and valve stem in the valve body so that the valve core matches the valve seat, and finally connect the upper valve cover to the valve body.

[0033] When it is necessary to inspect the inside of the valve body, open the upper valve cover, remove the bolts on the pressure ring inside the valve body, and replace and repair the valve seat after removing the pressure ring.

[0034] When internal maintenance is required, the upper valve cover can be opened to enter the warehouse for maintenance or replacement of internal parts; compared with side-mounted valves, the utility model does not need to open a separate inspection hole, which reduces the weight of the valve body and also reduces the leakage points; the overall length of the valve body is reduced, so the possibility of leakage caused by deformation due to temperature difference changes is reduced; the internal valve core, pressure ring and valve seat of the utility model can be disassembled and assembled online, which has obvious advantages compared with ultra-low temperature valves with side-mounted inspection ports.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A top-loading valve that is easy to disassemble and assemble a valve seat, comprising a valve body, a valve stem, a valve core and a valve seat, wherein the valve core is located in the valve body and connected to the valve stem, the valve seat is located in the valve body and cooperates with the valve core to form a sealing pair, the valve body is a top-loading valve body, and an upper valve cover that cooperates with the valve body is provided at the upper end of the valve body, characterized in that: A stepped hole is provided at the inner channel opening of the valve body, a lifting ring is installed in the stepped hole, the valve seat is installed in the lifting ring and contacts the bottom surface of the stepped hole, an annular retaining ring is provided on the side wall of the stepped hole to limit the axial movement of the lifting ring, a pressing ring is provided on the outer side of the annular retaining ring to clamp the valve seat, and the pressing ring is connected to the lifting ring by bolts.

2. A top-entry valve with an easily disassembled valve seat according to claim 1, characterized in that: A self-cleaning ring is provided between the pressure ring and the valve seat, the outer diameter of the self-cleaning ring is provided with a flange, the outer end surface of the valve seat is provided with a concave cavity for accommodating the self-cleaning ring, the bottom surface of the concave cavity is provided with an annular cavity for accommodating the flange, and the inner diameter surface of the self-cleaning ring is in contact with the sealing surface of the valve core.

3. A top-entry valve with an easily disassembled valve seat according to claim 1, characterized in that: The outer diameter of the inner end of the lifting ring is provided with a limiting ring, and the limiting ring is located between the annular retaining ring and the bottom surface of the stepped hole.

4. A top-entry valve with an easily disassembled valve seat according to claim 1, characterized in that: An annular boss is provided on the inner end surface of the pressure ring, and the annular boss is located between the outer diameter of the annular retaining ring and the valve seat. A plurality of countersunk holes penetrating the annular boss are provided on the outer end surface of the pressure ring, and the bolts are located in the countersunk holes and fixedly connected to the lifting ring.

5. The top-entry valve with easy-to-disassemble valve seat according to claim 1, characterized in that: The lifting ring is composed of two or three sections of arc-shaped plates connected end to end.

6. A top-entry valve with an easily disassembled valve seat according to claim 5, characterized in that: The arc plates are connected by dovetail groove connection.

7. A top-entry valve with an easily disassembled valve seat according to claim 4, characterized in that: A retaining ring is arranged in the countersunk hole to prevent the bolt from falling off.

8. The top-entry valve with easy-to-disassemble valve seat according to claim 4, characterized in that: The inner end surface of the pressure ring contacts the outer end surface of the annular retaining ring, the outer end surface of the valve seat and the self-cleaning ring.

9. The top-entry valve with easy-to-disassemble valve seat according to claim 1, characterized in that: The valve core is a butterfly plate or a sphere.

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