Angle welding valve purge tool

Abstract

The present invention relates to a purging tool for an angle-welded valve. At present, traditional purging methods waste a lot of manpower, material resources, and financial resources, and often have the drawback of incomplete purging. The present invention includes a valve body, wherein the valve body is provided with an inlet flow channel for fluid entry and an outlet flow channel for fluid exit; a valve body cavity is provided in the valve body corresponding to the inlet flow channel and the outlet flow channel; a valve seat is installed at the bottom of the valve body cavity, and is characterized in that a valve seat pressure ring for pressing the valve seat and the valve body is provided on the valve seat; a valve seat purging pressure plate is provided on the valve seat; a purging tool assembly is provided on the valve seat purging pressure plate; the purging tool assembly consists of a high-pressure seamless steel pipe and a valve cover purging pressure plate; a valve cover pull ring is provided above the valve body, and a sealing structure is provided between the valve cover pull ring and the valve cover purging pressure plate, and the high-pressure seamless steel pipe passes through the central guide hole of the valve cover pull ring. The present invention can increase the service life of the valve and ensure long-term reliable operation of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a purge tool for an angle welding valve. Background Art

[0002] Purging is a very important step before a petrochemical plant is completed and put into operation. It is the final inspection and acceptance of the plant's process flow and engineering quality, and is related to whether the entire plant can operate safely, stably and normally.

[0003] Before the device is put into use for the first time, it is necessary to purge the pipelines and equipment that have passed the installation inspection. The purpose is to use fluids such as air (nitrogen), steam, water and chemical solutions for purging and trial operation to remove residual impurities in the pipelines during the construction process. Otherwise, after the device is put into operation, the presence of impurities such as rust, welding slag, and ash will affect the quality of the medium passing through, and will be brought to various equipment along with the medium, causing valve blockage and damage to the valve sealing surface, affecting the normal operation of the system.

[0004] At present, the traditional purging method requires the removal of instruments, orifice plates, safety valves, throttle valves, check valves, and regulating valves before purging, and replacement with temporary short pipes or measures to protect them. They are then restored after the purging is qualified, wasting a lot of manpower, material resources, and financial resources, and often there is the disadvantage of incomplete purging.

[0005] Secondly, when arranging the on-site purge device, disassembly and assembly cannot be completed quickly, labor-savingly, and without damaging the valve body. Although the traditional angle-welded valve purge tool solves the problem of purging without disassembling the valve, the parts within the valve are limited and fixed to each other, which inevitably places strict requirements on the size of the purge tool used, increasing the difficulty and cost of part processing.

[0006] The shape and size of the opening in the purge tool can also affect the smooth flow of the passage, making it easy for the purge to fail and causing damage to the valve body. Furthermore, the valve cover pull ring and the valve cover purge plate are often bolted together. During purge, the force applied to each bolt group is not completely uniform, and some bolts may prematurely fatigue and break, resulting in losses.

[0007] It can be concluded that the existing angle welding valve purge tooling cannot meet the application of this working condition. Summary of the Invention

[0008] In view of the above problems, the present invention provides an angle welding valve purge tool, which is easy to disassemble and repair, can increase the service life of the valve, and ensure long-term reliable operation of the system.

[0009] The present invention adopts the following technical solution: a purging tool for an angle-welded valve, comprising a valve body, the valve body being provided with an inlet flow channel for fluid inlet and an outlet flow channel for fluid outflow; a valve body cavity being provided in the valve body between the inlet flow channel and the outlet flow channel; a valve seat being mounted at the bottom of the valve body cavity, characterized in that the valve seat is provided with a valve seat pressure ring for pressing the valve seat and the valve body; a valve seat purge pressure plate being provided on the valve seat; a purge tool assembly being provided on the valve seat purge pressure plate; the purge tool assembly being composed of a high-pressure seamless steel pipe and a valve cover purge pressure plate; a valve cover pull ring being provided above the valve body, a sealing structure being provided between the valve cover pull ring and the valve cover purge pressure plate, and the high-pressure seamless steel pipe extending through the central guide hole of the valve cover pull ring. The valve seat and valve cover are both self-sealing structures, and the sealing effect is achieved by pressing the valve cover purge pressure plate and the valve seat purge pressure plate together with fluid pressure.

[0010] Preferably, a plurality of through holes are evenly distributed on the lower wall of the high-pressure seamless steel pipe, and the plurality of through holes are arranged in different directions to ensure uniform blowing in all directions of the cavity.

[0011] Preferably, the through holes are rectangular, four in number and perpendicular to each other, so as to ensure that the air blown out of the through holes does not interfere with each other and ensure that the blowing work is unobstructed.

[0012] Preferably, a sealing structure consisting of a self-sealing ring, a self-sealing pressure ring and a four-open ring combination is arranged in sequence from bottom to top between the valve cover pull ring and the valve cover purge pressure plate.

[0013] Preferably, the valve cover purge plate is provided with an inclined step surface for mounting a self-sealing ring and a self-sealing pressure ring, and the self-sealing ring is in the form of a metal edging. The metal edging structure has reliable performance and high temperature resistance.

[0014] Preferably, the four open rings are distributed in four pieces and are disassembled through four holes drilled on the side of the valve body.

[0015] Preferably, the valve cover pull ring is provided with a threaded hole, and the bolts are directly connected to the threaded holes on the valve cover purge pressure plate, thereby fixing the valve cover pull ring.

[0016] Preferably, a groove for installing a metal wound gasket is provided on the back of the valve seat, the valve seat and the valve body are sealed by the metal wound gasket, and the valve seat pressure ring is threadedly connected to the valve body.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1) There is no need to disassemble the valve before purging, which simplifies the cleaning steps to ensure normal purging, increase the service life of the valve, and ensure long-term reliable operation of the system.

[0019] 2) It adopts a self-sealing structure. During purging, the valve cover purge plate and the valve seat purge plate are pressed tightly by fluid pressure to achieve a sealing effect. At the same time, it solves the problems of uneven force and fatigue fracture of the bolt connection between the valve cover pull ring and the valve cover purge plate.

[0020] 3) Easy to disassemble and repair, which saves time and effort, and will not cause damage to the valve body, and the maintenance utilization rate is high.

[0021] 4) The structure is simple and compact, and the purge tool assembly can be used with the parts that come with the valve, reducing the types of parts; at the same time, the processing accuracy requirements for the purge tool assembly are low, which can save the production cost of the entire product and improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 Schematic diagram of the purge tool assembly of the present invention.

[0024] Figure 3 for Figure 2 sectional view.

[0025] Figure 4 It is a schematic diagram of the internal structure of the present invention.

[0026] In the figure: 1. Valve body 2. Metal wound gasket 3. Valve seat 4. Valve seat pressure ring 5. Valve seat purge pressure plate 6. Purge tool assembly 7. Self-sealing ring 8. Self-sealing pressure ring 9. Four-open ring 10. Valve cover pull ring 11. Inlet flow channel 12. Outlet flow channel 13. Seamless steel pipe 14. Valve cover purge pressure plate. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to specific embodiments.

[0028] like Figures 1-4 The illustrated angle welding valve purge tool comprises a valve body 1, wherein an inlet flow channel 11 for fluid entry is provided at the left end of the valve body 1, and an outlet flow channel 12 for fluid outflow is provided at the lower end of the valve body 1, wherein the inlet flow channel 11 and the outlet flow channel 12 are perpendicular to each other, and a valve body cavity is also provided in the valve body 1, and the valve body cavity is located between the inlet flow channel 11 and the outlet flow channel 12.

[0029] In one embodiment, a positioning step surface for installing the valve seat 3 is provided at the bottom of the cavity of the valve body 1 to constrain the movement of the valve seat 3 in the radial direction inside the valve body 1. A groove for installing the metal winding gasket 2 is provided on the back of the valve seat 3 to achieve sealing between the valve body 1 and the valve seat 3.

[0030] In one embodiment, the valve seat 3 and the valve body 1 are pressed tightly by the valve seat pressure ring 4, and the valve seat pressure ring 4 is threadedly connected to the valve body 1. A valve seat purge pressure plate 5 is provided on the valve seat 3, and a groove is provided on the back of the valve seat purge pressure plate 5 for constraining the valve seat purge pressure plate 5 and achieving sealing.

[0031] In one embodiment, a purge tool assembly 6 is provided on the valve seat purge plate 5 . The purge tool assembly 6 is composed of a seamless steel pipe 13 for a high-pressure boiler and a valve cover purge plate 14 coaxially interlaced. A valve cover pull ring 10 is provided on the top of the valve body 1 .

[0032] Specifically, the valve cover purge pressure plate 14 is provided with an inclined step surface for installing a self-sealing ring and a self-sealing pressure ring, and the self-sealing ring is in the form of a metal edging.

[0033] In one embodiment, a plurality of through holes are evenly distributed on the lower wall of the high-pressure seamless steel pipe. The plurality of through holes are arranged in different directions to ensure uniform purge in all directions of the cavity.

[0034] Specifically, the through holes are rectangular, four in number and perpendicular to each other, ensuring that the air blown out of the through holes does not interfere with each other and that the blowing work is unobstructed.

[0035] In one embodiment, the valve cover pull ring 10 is provided with a threaded hole, and a bolt is directly connected to the threaded hole on the valve cover purge pressure plate 14, thereby connecting and fixing the valve cover pull ring 10. The self-sealing ring 7, the self-sealing pressure ring 8 and the four-open ring 9 are placed in sequence between the valve cover pull ring 10 and the valve cover purge pressure plate 14.

[0036] Specifically, the four open rings are distributed in four pieces and are disassembled near four holes punched on the side of the valve body.

[0037] The present invention works as follows:

[0038] When fluid enters the valve body cavity from the inlet flow channel 11, internal pressure forces the valve cover purge plate 14 upward, compressing the self-sealing ring 7 and self-sealing pressure ring 8. The four-open ring 9 is positioned against the holes on the side of the valve body 1 to achieve a sealing effect and prevent leakage of the valve body. The high-pressure boiler seamless steel pipe 13 passes through the guide hole of the valve cover pull ring 10. Four rectangular through-holes are evenly distributed on the wall of the high-pressure boiler seamless steel pipe 13 and are perpendicular to each other. During the purge operation, impurities such as rust, dust, welding slag, mud, and debris remaining in the pipe during the construction process enter the valve body cavity along with the fluid entering the pipe. Due to the internal pressure, they are blown out through the rectangular holes in the high-pressure boiler seamless steel pipe 13, thus completing the purge and cleaning work.

[0039] The present invention eliminates the need to disassemble the valve before purging, simplifying the cleaning process to ensure normal purging operation, extending the valve's service life, and ensuring long-term, reliable system operation. The self-sealing structure uses fluid pressure to compress the valve cover purge plate and the valve seat purge plate during purging, achieving a sealing effect. This also eliminates problems such as uneven force and fatigue fracture in the bolted connection between the valve cover pull ring and the valve cover purge plate.

[0040] It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.

Claims

1. A purging tool for an angle welding valve, comprising a valve body (1), wherein the valve body (1) is provided with an inlet flow channel (11) for fluid to enter and an outlet flow channel (12) for fluid to flow out; a valve body cavity is provided in the valve body (1) corresponding to the inlet flow channel (11) and the outlet flow channel (12); a valve seat (3) is installed at the bottom of the valve body cavity, characterized in that The valve seat (3) is provided with a valve seat pressure ring (4) for pressing the valve seat (3) and the valve body (1); the valve seat purge pressure plate (5) is provided on the valve seat (3); the valve seat purge pressure plate (5) is provided with a purge tool assembly (6); the purge tool assembly (6) is composed of a high-pressure seamless steel pipe (13) and a valve cover purge pressure plate (14); a valve cover pull ring (10) is provided above the valve body (1), a sealing structure is provided between the valve cover pull ring (10) and the valve cover purge pressure plate (14), the high-pressure seamless steel pipe (13) passes through the central guide hole of the valve cover pull ring (10), and a plurality of through holes are evenly distributed on the lower pipe wall of the high-pressure seamless steel pipe (13).

2. The angle welding valve purge tool according to claim 1, characterized in that The through holes are rectangular, four in number and perpendicular to each other.

3. The angle welding valve purge tool according to claim 1, characterized in that A sealing structure composed of a self-sealing ring (7), a self-sealing pressure ring (8) and four open rings (9) is arranged in sequence from bottom to top between the valve cover pull ring (10) and the valve cover purge pressure plate (14).

4. The angle welding valve purge tool according to claim 1, characterized in that The valve cover purge pressure plate (14) is provided with an inclined step surface for installing a self-sealing ring and a self-sealing pressure ring, and the self-sealing ring is in the form of a metal edging.

5. The angle welding valve purge tool according to claim 3, characterized in that The four open rings are distributed in four pieces and are disassembled by four holes punched on the side of the valve body.

6. The angle welding valve purge tool according to claim 1, characterized in that The valve cover pull ring (10) is provided with a threaded hole, and a bolt is directly connected to the threaded hole on the valve cover purge pressure plate (14), thereby fixing the valve cover pull ring (10).

7. The angle welding valve purge tool according to claim 1, characterized in that The back of the valve seat (3) is provided with a groove for installing a metal wound gasket, the valve seat and the valve body (1) are sealed by the metal wound gasket, and the valve seat pressure ring (4) is threadedly connected to the valve body (1).

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