A high-temperature and high-pressure forged steel high-performance gate valve body with guide grooves and its manufacturing method

Abstract

The present invention relates to a gate valve body, and specifically relates to a high-temperature, high-pressure, forged steel, high-performance gate valve body with a guide groove and a manufacturing method. A high-temperature, high-pressure, forged steel, high-performance gate valve body with a guide groove comprises a valve body, which is arranged on a valve seat, and the valve body comprises a vertical middle cavity, a horizontal channel is provided on the valve seat, the middle cavity is connected to the channel, a guide groove is provided at the lower end of the middle cavity, and a three-circle eccentric structure is provided at the intersection of the middle cavity and the channel. The significant effect of the present invention is that it makes full use of the excess material of the intersection of the three circles to process the guide groove and the inner boss of the valve seat, while increasing the reinforcement of the three-way corner.

Description

Technical Field

[0001] The present invention relates to a gate valve body, and in particular to a high-temperature and high-pressure forged steel high-performance gate valve body with a guide groove and a manufacturing method thereof. Background Art

[0002] The design of the existing high temperature and high pressure forged steel gate valve body is mainly as follows Figure 1 and 2 Two structures, Figure 1 The structure is that the interior of the valve body's central cavity is a three-way circular structure. In order to avoid interference with the central cavity seal and realize the processing of the guide groove, the inner diameter and wall thickness of the central cavity must be increased first, and then a tool withdrawal groove needs to be set. This leads to stress concentration in the valve body, a substantial increase in weight, and increased raw material costs; the three-way circular structure requires the design of a longer valve seat, which will also cause the gate design to be heavier.

[0003] Figure 2 The structure is a welded guide groove structure on both sides of the valve body cavity. This structure increases the number of welded parts and has hidden dangers in welding performance.

[0004] Figure 1 、 2 Common disadvantages: 1. The corner reinforcement of the tee is poor, that is, the theoretical calculation of the metal area and fluid area and the seismic performance are poor; 2. The valve seat is relatively long, the area under the medium pressure is large, and the sealing surface is easy to deform; 3. The valve seat weld is close to the welding grooves at both ends of the valve body, and there is a heat effect from welding. Summary of the Invention

[0005] The present invention aims to address the defects of the prior art and provides a high-temperature and high-pressure forged steel high-performance gate valve body with guide grooves and a manufacturing method thereof.

[0006] The present invention is achieved in that:

[0007] A high-temperature, high-pressure, forged steel, high-performance gate valve body with a guide groove, which includes a valve body, which is arranged on a valve seat. The valve body includes a vertical middle cavity, and a horizontal channel is provided on the valve seat. The middle cavity is connected to the channel, a guide groove is provided at the lower end of the middle cavity, and a three-circle eccentric structure is provided at the intersection of the middle cavity and the channel.

[0008] As described above, a high-temperature, high-pressure, forged steel high-performance gate valve body with a guide groove, wherein the outer diameter (A) of the middle cavity is 920 mm, the inner diameter (B) of the middle cavity is 560 mm, the upper half of the middle cavity is the middle cavity sealing section (M), the size of the middle cavity sealing section (M) is 485 mm, the guide groove depth (I) is 460 mm, and the wall thickness (C) of the middle cavity is 180 mm.

[0009] A high-temperature, high-pressure, forged steel, high-performance gate valve body with a guide groove as described above, wherein the inner diameter (G) of the channel is 368 mm, the valve seat is provided with a valve seat boss (N), the valve seat boss (N) matches the guide groove, the distance (H) between the valve seat and the port is 473 mm, and the film stress metal area (D) is 85136.6 mm 2 The size of the film stress fluid area (E) is 174589.2mm 2 .

[0010] As described above, a high-temperature, high-pressure, forged steel high-performance gate valve body with a guide groove, wherein the three-circle eccentric structure refers to a structure composed of three circles, the centers of which do not overlap.

[0011] As described above, a high-temperature, high-pressure, forged steel high-performance gate valve body with a guide groove, wherein the centers of the three circles of the three-circle eccentric structure are on the same horizontal plane, the front and rear positions are staggered, and the radii of the three circles are the same.

[0012] As described above, a high-temperature, high-pressure, forged steel high-performance gate valve body with a guide groove, wherein the distance between the center circle (R) of the three-circle eccentric structure and the center position of the eccentric circle I (S) is X: 70mm, Y: 160, Z: 102.

[0013] As described above, a high-temperature and high-pressure forged steel high-performance gate valve body with a guide groove, wherein the distance between the center circle (R) of the three-circle eccentric structure and the center position of the eccentric circle II (T) is the same as above.

[0014] A method for manufacturing a high-temperature, high-pressure, forged steel high-performance gate valve body with a guide groove, wherein the gate valve body is prepared according to the following steps:

[0015] First, perform rough machining on the channel and the middle cavity of the blank. At the center of the middle cavity, a circle with a diameter slightly larger than the distance between the two valve seats is machined until the channel is opened. Continue to use the center of the middle cavity as the reference to offset the distance to the left to locate the center of the circle and machine an eccentric circle to the channel. The diameter of the eccentric circle is the same as above or slightly larger.

[0016] Similarly, process the same size eccentric circle to the right to open up the channel. Continue to process the four eccentric circles that affect the movement of the gate valve, just enough to form the prototype of the guide groove on both sides of the middle cavity, and process the prototype of the valve body guide groove.

[0017] Continue to process the conical inner and outer cavities with the center of the middle cavity as the center of the circle to optimize the internal and external aesthetics, further significantly reduce the weight of the valve body, and reduce the impact of thermal stress under high temperature;

[0018] Finally, machining the valve seat into the valve body passage can significantly shorten the valve seat length and move it away from the port.

[0019] The remarkable effect of the present invention is: making full use of the excess material of the three circular intersections to process the guide groove and the inner boss of the valve seat, and at the same time increasing the three-way corner reinforcement, which has the following advantages: 1. The inner diameter of the valve cavity does not need to be increased, the structure is compact, relatively light, the machining is simple, the structure is ingenious, and no additional welding guide groove is required, reducing the hidden dangers of welding heat; 2. The valve seat is short in length and small in compression deformation. The valve seat weld is away from the end groove of the valve body to prevent deformation of the valve seat during welding of the valve and the pipeline; 3 According to theoretical calculations, the valve body corners are well reinforced, the overall seismic resistance is strong, and the sealing leakage caused by valve seat deformation is avoided. It is very suitable for the performance requirements of key wedge gate valves and parallel double-disc gate valves such as supercritical thermal power and nuclear power conventional islands. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a high-temperature and high-pressure forged steel gate valve body with an enlarged inner cavity and machined guide grooves.

[0021] Figure 2 yes Figure 1 Side view structural diagram.

[0022] Figure 3 This is a schematic diagram of the internal structure of a high-temperature and high-pressure forged steel valve body with common welded guide grooves.

[0023] Figure 4 yes Figure 3 Side view structural diagram.

[0024] Figure 5 It is a schematic diagram of the optimized structural principle of a high-performance forged steel gate valve body with a guide groove for high temperature and high pressure.

[0025] Figure 6 yes Figure 5 Side view structural diagram.

[0026] Figure 7 It is a top view of the intersection of three circles in the valve body cavity.

[0027] Figure 8 Three-dimensional cross-section of the valve body's internal structure.

[0028] Figure 9 Structural processing diagram of valve body

[0029] Among them, 1. valve body, 2. valve seat, A. outer diameter of the middle cavity, B. inner diameter of the middle cavity, C. wall thickness, D. film stress metal area, E. film stress fluid area, G. inner diameter of the channel, H. distance between valve seat and port, I. depth of guide groove, J. undercut groove, K. processing line, L. welding guide groove, M. middle cavity sealing section, N. valve seat boss, O. tee corner reinforcement, P. eccentric circle, Q. eccentric distance, R. center circle, S. eccentric circle I, T. eccentric circle II. DETAILED DESCRIPTION

[0030] The following is a further description of this patent with reference to the accompanying drawings:

[0031] like Figure 5-8 The figure shows a high-temperature, high-pressure, forged steel, high-performance gate valve body with a guide groove. It primarily comprises 1. a valve body and 2. a valve seat. The inner cavity of the valve body is composed of a central sealing section, a guide groove section, a channel, and an eccentric circular section. The internal structure is rational and compact, while the valve body's appearance is simple and aesthetically pleasing. The corners of the tee shown in the figure are reinforced based on membrane stress calculations. The guide grooves lack undercuts, eliminating significant stress concentration. The valve seat has a built-in seat boss, making it short, with a small pressure-bearing area, and located away from the welded ends of the valve body, minimizing sealing surface deformation.

[0032] The valve body cavity is a three-circle intersecting structure, and the excess material can be directly processed into a guide groove without increasing the inner diameter and wall thickness of the cavity, and can directly increase the corner area and valve body boss.

[0033] The valve body cavity has a smooth transition shape and no large stress concentration.

[0034] like Figure 9 As shown, the valve body processing steps are as follows: First, the channel and the middle cavity of the blank are rough-machined, and a circle with a diameter slightly larger than the distance between the two valve seats is machined at the center of the middle cavity until the channel is opened. The eccentric circle is machined to the channel with an offset distance to the left based on the center of the middle cavity. The diameter of the eccentric circle is the same as above or slightly larger. Similarly, an eccentric circle of the same size is machined to the right to open the channel. The four eccentric circles that affect the movement of the gate valve are continued to be machined, which can just form the prototype of the guide groove on both sides of the middle cavity. The valve body guide groove prototype is machined, and the conical inner cavity and outer cavity are continued to be machined with the center of the middle cavity as the center to optimize the internal and external aesthetics, further significantly reduce the weight of the valve body, and reduce the impact of thermal stress under high temperature. Finally, the valve seat is machined on the valve body channel, which can significantly shorten the length of the valve seat and keep it away from the port. The optimized structure of the high-temperature and high-pressure forged steel high-performance gate valve with a guide groove of the present invention can better adapt to high temperature, high pressure, earthquake resistance and other environments.

[0035] The above specific implementation methods are used to explain this patent rather than to limit this patent. Any modifications and changes made to this patent within the spirit and scope of protection of the claims of this patent shall fall within the scope of protection of this patent.

Claims

1. A method for manufacturing a high-temperature, high-pressure, forged steel high-performance gate valve body with a guide groove, characterized by: The high-performance gate valve body comprises a valve body (1), which is arranged on a valve seat (2), the valve body (1) comprises a vertical middle cavity, a horizontal channel is provided on the valve seat (2), the middle cavity is connected to the channel, a guide groove is provided at the lower end of the middle cavity, and a three-circle eccentric structure is provided at the intersection of the middle cavity and the channel; The outer diameter (A) of the middle cavity is 920 mm, the inner diameter (B) of the middle cavity is 560 mm, the upper half of the middle cavity is the middle cavity sealing section (M), the size of the middle cavity sealing section (M) is 485 mm, the depth (I) of the guide groove is 460 mm, and the wall thickness (C) of the middle cavity is 180 mm; The inner diameter (G) of the channel is 368 mm, the valve seat (2) is provided with a valve seat boss (N), the valve seat boss (N) matches the guide groove, the distance (H) between the valve seat and the port is 473 mm, and the size of the film stress metal area (D) is 85136.6 mm 2 The size of the film stress fluid area (E) is 174589.2mm 2 ; The three-circle eccentric structure is a structure consisting of three circles, the centers of which do not overlap. The centers of the three circles of the three-circle eccentric structure are on the same horizontal plane, the front and rear positions are staggered, and the radius of the three circles is the same; the three-circle eccentric structure also includes four eccentric circles located at the four corners; The valve body of the gate valve is prepared according to the following steps: First, perform rough machining on the channel and the middle cavity of the blank. At the center of the middle cavity, a circle with a diameter slightly larger than the distance between the two valve seats is machined until the channel is opened. Continue to use the center of the middle cavity as the reference to offset the distance to the left to locate the center of the circle and machine an eccentric circle to the channel. The diameter of the eccentric circle is the same as above or slightly larger. Similarly, process the eccentric circle of the same size to the right to open up the channel, and continue to process the four eccentric circles that affect the movement of the gate valve, so that the prototype of the guide groove can be formed on both sides of the middle cavity, and the prototype of the valve body guide groove is processed. Continue to process the conical inner and outer cavities with the center of the middle cavity as the center of the circle to optimize the internal and external aesthetics, further significantly reduce the weight of the valve body, and reduce the impact of thermal stress under high temperature; Finally, machining the valve seat into the valve body channel can significantly shorten the valve seat length and move it away from the port.

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