High-pressure-difference drain valve

Abstract

The utility model relates to the technical field of drain valves, in particular to a high pressure difference drain valve which comprises a valve body, a valve seat and a throttling assembly, the valve seat is detachably installed in the valve body, a positioning table is formed on the inner wall of the valve seat, and the throttling assembly is arranged above the positioning table and / or on the inner side of the positioning table. The high-pressure-difference drain valve can be suitable for the high-pressure-difference working condition, through the design that the throttling assembly is installed in the valve seat, throttling and graded pressure reduction can be conducted on high-pressure-difference media so that erosion to the sealing face of the valve can be reduced, the service life of the valve is prolonged, and the service life of the valve is prolonged. In addition, the working procedures of installing the throttling device on the pipeline for achieving high-pressure-difference medium throttling and graded pressure reduction can be reduced, the installation cost is reduced, and the installation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of steam traps, specifically a high-pressure differential steam trap. Background Technology

[0002] When condensate is generated in steam pipelines during operation, it needs to be discharged through steam traps to ensure steam quality and normal pipeline operation. In power plant steam systems, especially high-temperature and high-pressure pipelines such as main steam lines, steam traps must withstand the high pressure difference and high flow velocity between the steam pipeline and the condensate drain line. This makes the sealing surfaces of the steam traps prone to cavitation erosion, resulting in a short valve lifespan.

[0003] As a result, manufacturers have designed and developed steam traps with replaceable seats, steam traps with added throttling covers, and steam traps with added throttling devices before and after the valve to extend valve life. Currently, installing throttling components before and after the steam trap to throttle and reduce pressure in stages for high differential pressure media is a common design solution. However, this adds the step of installing the throttling device on the pipeline, increasing installation costs and reducing installation efficiency.

[0004] Based on this, this application designs a high pressure differential steam trap. Utility Model Content

[0005] The purpose of this utility model is to provide a high-pressure differential steam trap suitable for high-pressure differential working conditions. By installing a throttling component inside the valve seat, it can not only throttle and reduce the pressure of the high-pressure differential medium in stages to reduce the erosion of the valve sealing surface and improve the service life of the valve, but also reduce the steps of installing throttling devices on the pipeline to achieve high-pressure differential medium throttling and graded pressure reduction, thereby reducing installation costs and improving installation efficiency.

[0006] To solve the above-mentioned technical problems, this utility model provides a high pressure differential steam trap, including a valve body, a valve seat and a throttling component. The valve seat is detachably installed in the valve body, and a positioning platform is formed on the inner wall of the valve seat. The throttling component is disposed above the positioning platform and / or inside the positioning platform.

[0007] Furthermore, the throttling assembly is a single-layer throttling orifice plate, which is fixed to the inside of the positioning platform or above the positioning platform.

[0008] Furthermore, the throttling assembly includes two or more throttling orifice plates, each of which has a throttling zone and a plurality of throttling holes, with the throttling holes on adjacent throttling orifice plates being staggered.

[0009] Furthermore, a gap is provided between the throttling zones of two adjacent throttling orifice plates.

[0010] Furthermore, the gap between the throttling zones of two adjacent throttling orifice plates is 2mm-10mm.

[0011] Furthermore, the two ends of the throttling orifice plates of adjacent layers abut against each other, and the lower end of the bottom throttling orifice plate abuts against the upper surface of the positioning platform, while the top throttling orifice plate is fixed to the inner wall of the valve seat.

[0012] Furthermore, the bottommost throttling orifice plate is fixed to the inner side of the positioning platform, and the lower end of the topmost throttling orifice plate abuts against the upper surface of the positioning platform and is fixed to the inner wall of the valve seat.

[0013] Furthermore, the bottommost throttling orifice plate is fixed to the inner side of the positioning platform, the lower end of the second-to-last throttling orifice plate abuts against the upper surface of the positioning platform, two adjacent throttling orifice plates above the positioning platform abut against each other, and the topmost throttling orifice plate is fixed to the inner wall of the valve seat.

[0014] Furthermore, the topmost throttling orifice plate is fixed by spot welding, or the outer side of the topmost throttling orifice plate is provided with external threads that mate with the inner wall of the valve seat.

[0015] Furthermore, a gasket is provided between the lower outer wall of the valve seat and the inner wall of the valve body, and a flow equalization shroud is provided above the valve seat to abut against it. A packing and a packing cover are provided in sequence above the flow equalization shroud. The packing cover presses the packing and the flow equalization shroud together to install the valve seat in the valve body.

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

[0017] 1. The high pressure differential steam trap of this utility model is suitable for high pressure differential working conditions. By installing a throttling component inside the valve seat, it can not only throttle and reduce the pressure of the high pressure differential medium in stages to reduce the erosion of the valve sealing surface and improve the service life of the valve, but also reduce the process of installing a throttling device on the pipeline to achieve throttling and pressure reduction of the high pressure differential medium, thereby reducing the installation cost and improving the installation efficiency.

[0018] 2. The throttling component of the high pressure differential steam trap of this utility model can be a single-layer throttling orifice plate. A layer of throttling orifice plate can be directly processed on the inner side of the positioning platform of the valve seat to meet the requirements of certain working conditions. Alternatively, in specific applications, two or more layers of throttling orifice plates can be installed above the positioning platform according to the working conditions to meet different usage requirements.

[0019] 3. The throttling component of the high pressure differential steam trap of this utility model can be two or more layers of throttling orifice plates. The two ends of the throttling orifice plates of two adjacent layers abut against each other, and the lower end of the bottom throttling orifice plate abuts against the upper surface of the positioning platform. The top throttling orifice plate is fixed on the inner wall of the valve seat. In specific applications, the number of throttling orifice plates can be easily adjusted according to the working conditions.

[0020] 4. The throttling orifices of the two adjacent layers of throttling orifice plates of this utility model are staggered, which can promote more thorough mixing and throttling of the fluid when passing through the throttling orifice plates; and a certain gap is provided between the throttling zones of the two adjacent layers of throttling orifice plates. Specifically, the gap can be set between 2mm and 10mm. This gap, combined with the size of the throttling orifice and the staggering of the throttling orifice, can achieve the required throttling effect and meet the needs of different working conditions. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the high-pressure differential steam trap of Embodiment 1 of this utility model;

[0023] Figure 2 yes Figure 1 Enlarged view of region A in the middle;

[0024] Figure 3 This is a schematic diagram of the high-pressure differential steam trap of Embodiment 2 of this utility model;

[0025] Figure 4 yes Figure 3 Enlarged view of region B in the middle;

[0026] In the figure: 1-valve body, 2-valve seat, 3-throttling assembly, 4-gasket, 5-flow equalization cover, 6-valve disc, 7-valve stem, 8-packing, 9-packing cover plate, 21-positioning platform, 31-throttling orifice plate, 61-sealing surface. Detailed Implementation

[0027] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] Example 1

[0029] A high-pressure differential steam trap includes a valve body 1, a valve seat 2, and a throttling assembly 3. The valve seat 2 is detachably installed inside the valve body 1. A positioning platform 21 is formed on the inner wall of the valve seat 2. The throttling assembly 3 is disposed above the positioning platform 21. The throttling assembly 3 includes two or more layers of throttling orifice plates 31. Each layer of throttling orifice plate 31 is provided with a throttling area. Several throttling orifices are opened in the throttling area. The throttling orifices on adjacent layers of throttling orifice plates 31 are staggered. There is a gap between the throttling areas of adjacent layers of throttling orifice plates 31. The two ends of adjacent layers of throttling orifice plates 31 abut against each other. The lower end of the bottom layer of throttling orifice plate 31 abuts against the upper surface of the positioning platform 21. The top layer of throttling orifice plate 31 is fixed on the inner wall of the valve seat 2.

[0030] This utility model's high-pressure differential steam trap is suitable for high-pressure differential operating conditions. By installing a throttling component inside the valve seat, it can not only throttle and reduce the pressure of the high-pressure differential medium in stages to reduce erosion of the valve sealing surface and improve the service life of the valve, but also reduce the steps of installing throttling devices on the pipeline to achieve high-pressure differential medium throttling and staged pressure reduction, thus reducing installation costs and improving installation efficiency. The staggered arrangement of the throttling orifice plates on adjacent throttling orifice plates can promote more thorough mixing and throttling of the fluid when passing through the throttling orifice plates.

[0031] like Figure 1-2 As shown, in this embodiment, the throttling assembly includes three layers of throttling orifice plates 31. Of course, in other embodiments, the throttling assembly may include two layers or other numbers of throttling orifice plates. Specifically, when the throttling assembly is a two-layer throttling orifice plate, the two ends of the two layers of throttling orifice plates 31 abut against each other, and the lower end of the bottom throttling orifice plate 31 abuts against the upper surface of the positioning platform 21, and the top throttling orifice plate 31 is fixed on the inner wall of the valve seat 2.

[0032] Specifically, in this embodiment, the gap between the throttling zones of two adjacent throttling orifice plates 31 is 2mm-10mm; this gap, combined with the size of the throttling orifice and the staggering of the throttling orifices, can achieve the required throttling effect and meet the needs of different working conditions.

[0033] Specifically, the topmost throttling orifice plate 31 is fixed by spot welding, or the outer side of the topmost throttling orifice plate 31 is provided with external threads that mate with the inner wall of the valve seat 2.

[0034] Specifically, a gasket 4 is provided between the lower outer wall of the valve seat 2 and the inner wall of the valve body 1. A flow equalization shroud 5 is provided above the valve seat 2 to abut against it. A packing 8 and a packing cover plate 9 are arranged in sequence above the flow equalization shroud 5. A valve disc 6 is provided inside the flow equalization shroud 5. A valve stem 7 passes through the valve disc 6. A sealing surface 61 that mates with the valve seat 2 is provided on the lower outer side of the valve disc 6. The packing cover plate 9 presses the packing 8 and the flow equalization shroud 5 in sequence to install the valve seat 2 inside the valve body 1. Through this design, the valve seat 2 can be detachably installed.

[0035] Example 2

[0036] The difference from Embodiment 1 is that the throttling component 3 is disposed above the positioning platform 21 and inside the positioning platform 21;

[0037] Specifically, the bottommost throttling orifice plate 31 is fixed to the inner side of the positioning platform 21 (integrated with the positioning platform 21), the lower end of the second-to-last throttling orifice plate 31 abuts against the upper surface of the positioning platform 21, the two ends of two adjacent throttling orifice plates 31 above the positioning platform 21 abut against each other, and the topmost throttling orifice plate 31 is fixed to the inner wall of the valve seat 2.

[0038] like Figure 3-4 As shown, in this embodiment, the throttling component 3 includes three layers of throttling orifice plates 31. Of course, in other embodiments, the throttling component 3 may include two layers or other numbers of throttling orifice plates 31. In other embodiments, if the throttling component 3 is a two-layer throttling orifice plate 31, the bottommost throttling orifice plate 31 is fixed to the inner side of the positioning platform 21, and the lower end of the topmost throttling orifice plate 31 abuts against the upper surface of the positioning platform 21 and is fixed to the inner wall of the valve seat 2.

[0039] Example 3

[0040] The difference from Embodiment 1 is that the throttling component 3 is a single-layer throttling orifice plate 31, which is fixed to the inner side of the positioning platform 21 (integratedly formed and connected with the positioning platform 21). In other embodiments, the single-layer throttling orifice plate 31 can be fixed above the positioning platform 21, where the fixing method can be direct welding; in specific applications, two or more layers of throttling orifice plates 31 can be set above the positioning platform 21 as needed to meet the requirements of high pressure differential conditions.

[0041] The above-disclosed embodiments are merely several preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A high-pressure differential steam trap, characterized in that, The valve includes a valve body (1), a valve seat (2), and a throttling assembly (3). The valve seat (2) is detachably installed inside the valve body (1). A positioning platform (21) is formed on the inner wall of the valve seat (2). The throttling assembly (3) is disposed above the positioning platform (21) and / or inside the positioning platform (21).

2. The high-pressure differential steam trap according to claim 1, characterized in that, The throttling assembly (3) is a single-layer throttling orifice plate (31), which is fixed to the inside of the positioning platform (21) or above the positioning platform (21).

3. A high-pressure differential steam trap according to claim 1, characterized in that, The throttling assembly (3) includes two or more layers of throttling orifice plates (31). Each layer of the throttling orifice plate (31) is provided with a throttling area, and a number of throttling holes are opened in the throttling area. The throttling holes on adjacent layers of the throttling orifice plates (31) are staggered.

4. A high-pressure differential steam trap according to claim 3, characterized in that, A gap is provided between the throttling zones of the two adjacent throttling orifice plates (31).

5. A high-pressure differential steam trap according to claim 4, characterized in that, The gap between the throttling zones of two adjacent throttling orifice plates (31) is 2mm-10mm.

6. A high-pressure differential steam trap according to claim 3, characterized in that, The two ends of the throttling orifice plates (31) of the two adjacent layers abut each other, and the lower end of the bottom throttling orifice plate (31) abuts the upper surface of the positioning platform (21), while the top throttling orifice plate (31) is fixed on the inner wall of the valve seat (2).

7. A high-pressure differential steam trap according to claim 3, characterized in that, The bottommost throttling orifice plate (31) is fixed to the inner side of the positioning platform (21), and the lower end of the topmost throttling orifice plate (31) abuts against the upper surface of the positioning platform (21) and is fixed to the inner wall of the valve seat (2).

8. A high-pressure differential steam trap according to claim 3, characterized in that, The bottommost throttling orifice plate (31) is fixed to the inner side of the positioning platform (21), the lower end of the second-to-last throttling orifice plate (31) abuts against the upper surface of the positioning platform (21), two adjacent throttling orifice plates (31) above the positioning platform (21) abut against each other, and the topmost throttling orifice plate (31) is fixed to the inner wall of the valve seat (2).

9. A high-pressure differential steam trap according to any one of claims 6-8, characterized in that, The topmost throttling orifice plate (31) is fixed by spot welding, or the outer side of the topmost throttling orifice plate (31) is provided with an external thread that mates with the inner wall of the valve seat (2).

10. A high-pressure differential steam trap according to claim 1, characterized in that, A gasket (4) is provided between the lower outer wall of the valve seat (2) and the inner wall of the valve body (1). A flow equalization hood (5) is provided above the valve seat (2) to abut against it. A packing (8) and a packing cover plate (9) are provided above the flow equalization hood (5) in sequence. The packing cover plate (9) presses the packing (8) and the flow equalization hood (5) in sequence to install the valve seat (2) inside the valve body (1).

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