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

Abstract

The present invention relates to gate valve bodies, and specifically to a high-temperature, high-pressure, forged steel, high-performance gate valve body with guide ribs and a manufacturing method. A high-temperature, high-pressure, forged steel, high-performance gate valve body with guide ribs comprises a valve body disposed on a valve seat, the valve body comprising a vertical central cavity, a horizontal channel disposed on the valve seat, the central cavity being connected to the channel, a guide rib disposed at the lower end of the central cavity, and a three-circle eccentric structure disposed at the intersection of the central cavity and the channel. The present invention has the significant effect of fully utilizing the excess material from the intersection of the three circles to machine the guide ribs and the inner boss of the valve seat, while also increasing the reinforcement of the tee corner.

Description

Technical Field

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

[0002] The design of the existing high temperature and high pressure free forging gate valve body is mainly as follows Figure 1 and 2 Two structures, Figure 1-2 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 3-4 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 1-4 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 free-forged high-performance gate valve body with guide ribs and a manufacturing method thereof.

[0006] The present invention is implemented as follows: a high-temperature, high-pressure, forged steel high-performance gate valve body with guide ribs, including a valve body, which is arranged on a valve seat, the valve body including a vertical middle cavity, and a horizontal channel is provided on the valve seat, the middle cavity is connected to the channel, a guide rib 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.

[0007] As described above, a high-temperature, high-pressure forged steel high-performance gate valve body with guide ribs, 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 rib depth (I) is 460 mm, and the wall thickness (C) of the middle cavity is 180 mm.

[0008] As described above, a high-temperature, high-pressure forged steel high-performance gate valve body with a guide rib is provided, 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 rib, 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 .

[0009] As described above, in a high-temperature, high-pressure, forged steel high-performance gate valve body with guide ribs, the three-circle eccentric structure refers to a structure composed of three circles, the centers of which do not overlap.

[0010] As described above, a high-temperature, high-pressure forged steel high-performance gate valve body with guide ribs, 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.

[0011] The high-temperature, high-pressure, forged steel high-performance gate valve body with guide ribs as described above is characterized in that the gate plate guide ribs and the boss in the valve seat hole are directly machined into the valve body.

[0012] As described above, in a high-temperature, high-pressure, forged steel high-performance gate valve body with guide ribs, the inner boss of the valve body is welded to the short valve seat.

[0013] A method for manufacturing a high-temperature, high-pressure, forged steel high-performance gate valve body with guide ribs. The gate valve body is prepared according to the following steps:

[0014] First, the rough machining of the channel and the middle cavity of the blank is carried out, 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.

[0015] 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 process the 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 ribs on both sides of the middle cavity.

[0017] The valve body guide rib prototype is processed, and the conical inner and outer cavities are processed with the center of the middle cavity as the center of the circle to optimize the internal and external aesthetics, further significantly reducing the weight of the valve body and reducing the impact of thermal stress under high temperature;

[0018] Finally, the valve seat is machined in the valve body channel, which can significantly shorten the valve seat length and keep it away from the port. The present invention is a high-temperature and high-pressure forged steel high-performance gate valve body with guide ribs with an optimized structure, which can better adapt to high-temperature, high-pressure, and earthquake-resistant environments.

[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 ribs 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 of guide ribs is required, reducing the hidden dangers of welding heat; 2. The valve seat is short in length and has small 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, high-temperature and high-pressure free-forged gate valve body with a guide groove.

[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. DETAILED DESCRIPTION

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

[0031] like Figure 3 The figure shows an optimized structure for a high-temperature, high-pressure, free-forged, high-performance gate valve body with guide ribs. It primarily comprises 1. a valve body and 2. a valve seat. The inner cavity of the valve body is composed of a central cavity 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 well reinforced based on membrane stress calculations. The guide ribs lack undercuts, eliminating significant stress concentration. The valve seat has a built-in seat boss, resulting in a short seat with a small pressure-bearing area and distance from the welded ends of the valve body, minimizing sealing surface deformation.

[0032] like Figure 4 As shown, the valve body cavity is a three-circle intersecting structure, and the excess material can be directly processed into guide ribs without increasing the inner diameter and wall thickness of the cavity, and can directly increase the corner area and valve body boss.

[0033] like Figure 5 As shown in the figure, the valve body cavity has a smooth transition and no large stress concentration.

[0034] like Figure 6 As shown, first, the channel and the middle cavity of the blank are rough-machined. 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 machined to form the prototype of the guide ribs on both sides of the middle cavity. The ribs of the valve body guide rib prototype are machined. The conical inner cavity and outer cavity are 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 in the valve body channel, which can significantly shorten the length of the valve seat and keep it away from the port. The present invention is a high-temperature and high-pressure free-forged high-performance gate valve body with guide ribs and an optimized structure that can better adapt to high-temperature, high-pressure, and seismic 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 guide ribs, 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 rib 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 guide rib depth (I) 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 rib, 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 radii of the three circles are the same; The valve body of the gate valve is prepared according to the following steps: First, the rough machining of the channel and the middle cavity of the blank is carried out, 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. 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 process the 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 to form the prototype of the guide ribs on both sides of the middle cavity. The valve body guide rib prototype is processed, and the conical inner and outer cavities are processed with the center of the middle cavity as the center of the circle to optimize the internal and external aesthetics, further significantly reducing the weight of the valve body and reducing 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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