A corrosion-resistant ball valve forging made of duplex stainless steel and its manufacturing process

Abstract

The present invention discloses a corrosion-resistant ball valve forging made of duplex stainless steel and a manufacturing process thereof, which relates to the technical field of ball valves. The corrosion-resistant ball valve forging made of duplex stainless steel and the manufacturing process thereof include: a valve body, and a liquid control device is arranged at the bottom of the valve body; the liquid control device includes: a pipe body, a first opening and closing member and a second opening and closing member are arranged in the pipe body, and a transverse plate is connected to the sides of the first opening and closing member and the second opening and closing member close to each other through a first spring and a second spring. The corrosion-resistant ball valve forging made of duplex stainless steel and the manufacturing process thereof divide the pipeline into multiple cavities through a plurality of opening and closing members, and under the combined action of elasticity and gravity, control the opening and closing of the opening and closing members, timely discharge the substances accumulated in the gap and record the discharge time, and assist in judging the reason for the substances accumulated in the gap; the process of ingot hot charge into the furnace - forging forming - hot charge transfer heat treatment is adopted to produce duplex stainless steel forgings of more than 10 tons.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and particularly to a corrosion-resistant ball valve forging made of duplex stainless steel and a manufacturing process thereof. Background Art

[0002] A ball valve forging is a ball valve component processed by forging technology. The ball valve relies on rotating the valve stem to drive the ball to realize the opening and closing of the valve and control the on-off and flow direction of the fluid. There is a cavity between the valve body and the ball.

[0003] Referring to Chinese Patent Publication No.: CN109140013A, a new type of ball valve end cover forging, including an integrally formed end cover. The end cover includes an end cover body. A support member is provided at the top of the end cover body, and a reinforcing body is provided at the connection between the support member and the end cover body. A screwing block matched with the valve body is provided at the bottom of the end cover body, and a positioning groove is provided on the outer side of the screwing block. The side wall of the positioning groove close to the end cover body is set as a positioning end face, and a sealing groove is opened on the positioning end face. A receiving groove matched with the valve core is longitudinally opened in the inner cavity of the screwing block, a hollow groove matched with the valve stem is longitudinally opened in the inner cavity of the support member, and the receiving groove and the hollow groove are communicated through a limiting groove. A screw hole is opened in the circumferential direction at the top of the support member, which can realize quick positioning, improve the convenience of installation, and improve the sealing effect between the valve body and the end cover.

[0004] If there is a certain inclination at the bottom of the valve body, the solution will easily flow to the bottom of the valve body and accumulate under the action of gravity. This is especially common in some non-horizontally installed pipeline systems; when the viscosity of the fluid in the pipeline is high and the flow rate is low, the fluidity of the solution is poor and it is easy to form accumulation at the bottom of the valve body. For example, in some pipelines that transport high-viscosity grease or colloidal substances, when the ball rotates, the solution cannot be carried away with the main flow of the fluid in time, and it will gradually accumulate at the bottom of the valve body; if the fluid medium contains solid impurities, particles or fibers and other substances, these impurities may precipitate and accumulate at the bottom of the valve body. As time goes by, the accumulated impurities will become more and more, and may even affect the normal operation of the valve; when the sealing performance of the ball valve decreases and leakage occurs, even if the ball is in the closed state, a small amount of solution will leak from the gap between the ball and the valve seat or other sealing parts to the bottom of the valve body, and long-term accumulation will form solution accumulation. The material accumulated at the bottom of the valve body will increase the resistance to the rotation of the ball and increase the force required to operate the valve. The material accumulated at the bottom of the valve body may be sandwiched between the ball and the valve seat, making it impossible for the two to fit tightly, destroying the integrity of the sealing surface, and increasing the wear of the ball and the valve seat, reducing the sealing effect of the valve, and thus affecting the sealing and stability of the entire system; the valve body, valve cover, and ball of large-size forgings (above 10 tons) ball valves are generally made of carbon steel and austenitic stainless steel. In order to ensure the corrosion resistance of the valve body, duplex stainless steel is finally welded on the surface. Since this structure is a welding structure of two materials, there are defects such as desoldering and delamination. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a corrosion-resistant ball valve forging made of duplex stainless steel and a manufacturing process, in which a pipeline is divided into multiple cavities by a plurality of opening and closing parts. Under the joint action of elasticity and gravity, the opening and closing of the opening and closing parts are controlled, so that excessive substances accumulated in the gap can be discharged in time and the discharge time can be recorded, thereby assisting in determining the cause of the accumulation of substances in the gap.

[0006] Technical solution: To achieve the above objectives, the present invention is implemented through the following technical solution: A corrosion-resistant forging made of duplex stainless steel, comprising: a valve body, a bottom hole is formed through the bottom of the valve body, a liquid control device is arranged in the bottom hole, the liquid control device comprises: a tube body, the side of the tube body is connected to the inner wall of the bottom hole, a first opening and closing piece, a second opening and closing piece, and a cross plate are arranged in the tube body, the two sides of the cross plate are respectively connected to the side close to the first opening and closing piece and the second opening and closing piece through a first spring and a second spring, the first opening and closing piece is used to control the opening of the cavity and discharge the substance accumulated in the cavity, and the second opening and closing piece is used to control the opening of the tube body and discharge the substance accumulated in the tube body.

[0007] A corrosion-resistant ball valve made of duplex stainless steel, comprising: a corrosion-resistant forging made of duplex stainless steel and a liquid control device, the liquid control device being connected to the inner wall of the bottom hole, a sphere being arranged inside the valve body, a gap being arranged between the sphere and the valve body, the gap being communicated with one end of the bottom hole, valve seats being symmetrically arranged on the left and right sides of the valve body, the top of the sphere being connected to a handle through a valve stem, a rotation sensor being connected to the upper surface of the handle, the rotation sensor being used for monitoring the rotation condition of the handle in real time, the rotation sensor being electrically connected to a timer through a wire, and the timer cooperating with the rotation sensor to obtain the start and end moments of the handle rotation and the interval time between two adjacent rotations.

[0008] Preferably, the liquid control device further comprises: a first cavity, the first cavity being opened in the middle upper part of the pipe body, a second cavity being opened in the lower part of the pipe body and being communicated with the first cavity, a first opening and closing member being arranged at the top of the first cavity, a second opening and closing member being arranged at the bottom of the first cavity, one side of a cross plate being connected to the inner wall of the lower part of the first cavity, the top of the cross plate being connected to the first opening and closing member through a first spring, and the bottom of the cross plate being connected to the top of the second opening and closing member through a second spring.

[0009] Preferably, the first opening and closing member comprises: a sealing ring, the side surface of the sealing ring being connected to the inner wall of the top of the pipe body, a pressing groove being opened at the middle position of the lower surface of the sealing ring, the lower surface of the sealing ring near one end of the axis of the pipe body being a pressing surface, an outer strip being clamped in the pressing groove, the outer strip being connected to an inner plate through a connecting strip, a plurality of discharge holes being annularly arrayed and opened through the top of the connecting strip, a connecting block being connected to the bottom of the sealing ring, the bottom of the connecting block being parallel to the horizontal plane, and a pressure sensor being arranged directly below the connecting block, the side surface of the pressure sensor being connected to the inner wall of the upper part of the pipe body, and the pressure sensor being used for receiving the extrusion of the connecting block and obtaining the start moment, end moment and extrusion duration of the extrusion.

[0010] Preferably, the inner plate is a spherical plate, the connecting strip and the outer strip are both annular strips, the lower surface of the connecting strip and the lower surface of the outer strip are in the same plane, the upper surface of the connecting strip is located below the lower surface of the outer strip, and the upper surface of the connecting strip and the upper surface of the outer strip are parallel to each other.

[0011] Preferably, the included angle between the connecting strip and the vertical direction is smaller than the included angle between the tangent of the outer edge of the inner plate and the vertical direction.

[0012] Preferably, the pressing surface is adapted to the upper surface of the connecting strip. When the outer strip is clamped in the pressing groove, the pressing surface abuts against the connecting strip, the pressing surface is used for sealing the discharge holes, and the pressing groove is used for sealing the outer strip.

[0013] Preferably, the second opening and closing member includes: a sealing ring, which is connected to the inner wall of the lower part of the first cavity. The cross-sectional view of one end of the sealing ring after unfolding is an inverted needle shape. The side away from the axis of the pipe body of the sealing ring is the side surface, and the side surface is connected to the inner wall of the first cavity. The side close to the axis of the pipe body of the sealing ring is composed of an inclined surface and an arc surface, the inclined surface is located above the arc surface, and a moving plate is connected to the inner wall of the sealing ring.

[0014] Preferably, the inclined surface and the side surface gradually contract along the axis direction of the pipe body, the arc surface and the side surface gradually contract along the axis direction of the pipe body. The distance from the top of the inclined surface to the side surface is greater than the distance from the bottom of the inclined surface to the side surface. The distance from the bottom of the inclined surface to the side surface is equal to the distance from the top of the arc surface to the side surface. The distance from the top of the arc surface to the side surface is greater than the distance from the bottom of the arc surface to the side surface.

[0015] Preferably, the diameter of the moving plate is greater than the diameter of the bottom of the sealing ring, and the diameter of the moving plate is less than the diameter of the top of the sealing ring.

[0016] A process for manufacturing the corrosion-resistant forging of duplex stainless steel material includes: ingot hot charging: preheat the forging heating furnace in advance to a range within 100°C of the temperature of the steel ingot. After demoulding, the hot steel ingot is immediately transferred to the forging heating furnace for heating, and the hot steel ingot is slowly heated to 1200°C.

[0017] Forging and forming: Use a 60MN press to compact the surface of the ingot with small deformation, remove the riser of the ingot, and then perform upsetting and drawing operations on the ingot to form it, with a total of 4 - 5 heating times.

[0018] Hot material transfer to heat treatment: After forging, the hot material is transferred to the heat treatment furnace for solution treatment. The heat treatment furnace needs to be preheated to 1100°C and kept warm waiting for the material.

[0019] Beneficial effects: The present invention provides a corrosion-resistant ball valve forging of duplex stainless steel material and a manufacturing process. Compared with the prior art, it has the following beneficial effects: 1. The pipeline is divided into multiple cavities by the first opening and closing member and the second opening and closing member. Each opening and closing member is equivalent to a valve. Under the combined action of elasticity and gravity, the opening and closing of the opening and closing member are controlled, which can facilitate the timely discharge of excessive substances accumulated in the gap and record the discharge time, and assist in judging the reason for the accumulation of substances in the gap.

[0020] 2. Control the opening and closing of the first opening and closing member by the upward elastic force of the first spring and the resultant force of the entire plate where the inner plate is located vertically downward. After the first opening and closing member is opened, it can not only discharge excessive substances at the bottom of the valve body into the first cavity to keep the gap between the valve body and the sphere clean, but also record the opening time and opening frequency of the first opening and closing member through the pressure sensor to assist in inferring the reason for the accumulation of substances at the bottom of the valve body. The first cavity and the second cavity are separated by the second opening and closing member to prevent the gap from directly communicating with the second cavity and even the outside of the pipe body. The multi-layer seal forms multiple sealing barriers, which can more effectively prevent substance leakage. When there is too much substance in the gap, the substance can be automatically discharged into the first cavity without worrying about the direct connection between the first cavity and the outside world.

[0021] 3. The top inside needs to extend into the gap and contact the substances in the gap. In order to minimize the volume of the inner plate on the basis of ensuring the contact area between the inner plate and the substances in the gap, the inner plate is designed as a spherical plate. Compared with a plane, the surface area of the spherical arc is larger, and the arc has a curvature, which is also more conducive to the substances sliding down along the arc surface.

[0022] 4. The upper surface of the connecting strip is located below the lower surface of the outer strip, and the upper surface of the connecting strip is parallel to the upper surface of the outer strip, so that the top of the connecting strip is lower than the top of the outer strip. The outer strip is like a wall set outside the connecting strip, and the connecting strip is like a sunken ditch, which is convenient for substances to discharge from the discharge holes on the connecting strip and reduces the contact between the substances and the outer strip. The included angle between the connecting strip and the vertical direction is smaller than the included angle between the tangent of the outer edge of the inner plate and the vertical direction, and the inclination degree of the connecting strip is greater. This can not only increase the component force when the substances slide along the surface of the connecting strip, but also increase the accommodation space between the connecting strip, the outer strip and the top of the pipe body, reducing the possibility of impurities contacting the outer strip.

[0023] 5. The controller obtains the start and end times of the handle rotation, the interval time between two adjacent rotations, the start time, end time and duration of the extrusion, and the pressure value in real time and transmits them to the plan view, marks the pressure value on the plan view and forms a pressure line. By observing the plan view, the reason for the accumulation of substances at the bottom of the valve body can be preliminarily judged. The device has a simple structure and is easy to operate.

[0024] 6. Through the production mode of ingot hot material entering the furnace - forging forming - hot material transferring to heat treatment, on the one hand, it shortens the heating and heat treatment heating-up time, saves energy, and at the same time shortens the entire manufacturing process and improves production efficiency. On the other hand, this mode can avoid surface cracking of the steel ingot, ensure the forming quality of the forgings, and reduce the workload of subsequent grinding and machining. It can realize the forging of duplex stainless steel over 10 tons. Brief Description of the Drawings

[0025] The accompanying drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present application and, together with the specification, are further used to explain the principles of the present application and enable those skilled in the relevant art to implement and use the present application.

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the present invention.

[0028] Figure 2 It is Figure 1 A perspective view from below.

[0029] Figure 3 It is a schematic sectional view of the present invention.

[0030] Figure 4 It is Figure 3 A schematic structural diagram of the central control liquid device and its adjacent part of the valve body and part of the sphere.

[0031] Figure 5 It is a schematic structural diagram of his 4 central control liquid device.

[0032] Figure 6 It is a separated view of the pipe body and the internal structure in the liquid control device.

[0033] Figure 7 It is a schematic structural diagram of the liquid control device after removing the pipe body.

[0034] Figure 8 It is an exploded view of the first opening and closing member.

[0035] Figure 9 It is a schematic structural diagram of the part where the outer strip and the inner plate are located.

[0036] Figure 10 It is a schematic sectional view of the part where the outer strip and the inner plate are located.

[0037] Figure 11 It is a schematic sectional view of the sealing ring.

[0038] Figure 12 It is an enlarged view of A.

[0039] Figure 13 It is a schematic sectional view of the second opening and closing member.

[0040] Figure 14 It is an enlarged view of B.

[0041] The reference numerals in the figure are: 11, valve body; 12, sphere; 13, valve stem; 14, handle; 15, valve seat; 21, rotation sensor; 22, wire; 23, timer; 3, liquid control device; 31, pipe body; 32, first spring; 33, cross plate; 34, second spring; 35, first opening and closing member; 351, outer strip; 352, connecting strip; 353, discharge hole; 354, inner plate; 355, pressure sensor; 356, sealing ring; 357, connecting block; 358, pressing groove; 359, pressing surface; 36, second opening and closing member; 361, sealing ring; 362, moving plate; 363, inclined surface; 364, arc surface; 365, side surface; 37, first cavity; 38, second cavity; 4, gap; 5, bottom hole.

[0042] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present invention to this specific structure, device and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. Detailed implementation manners

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0044] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0045] Embodiment 1: As Figure 1 - Figure 14 shown, an embodiment of the present invention provides a corrosion-resistant forging made of duplex stainless steel, including: a valve body 11, a bottom hole 5 is penetrated and opened at the bottom of the valve body 11, a liquid control device 3 is arranged in the bottom hole 5, and the liquid control device 3 includes: a pipe body 31, the side surface 365 of the pipe body 31 is connected to the inner wall of the bottom hole 5, a first opening and closing member 35, a second opening and closing member 36, and a cross plate 33 are arranged in the pipe body 31, both sides of the cross plate 33 are respectively connected to the sides of the first opening and closing member 35 and the second opening and closing member 36 close to each other through a first spring 32 and a second spring 34, the first opening and closing member 35 is used to control the opening and closing of the cavity and discharge the substances accumulated in the cavity, and the second opening and closing member 36 is used to control the opening and closing of the pipe body 31 and discharge the substances accumulated in the pipe body 31.

[0046] A corrosion-resistant ball valve made of duplex stainless steel, comprising: a corrosion-resistant forging made of duplex stainless steel and a liquid control device 3. The liquid control device 3 is connected to the inner wall of the bottom hole 5. A sphere 12 is arranged inside the valve body 11. A gap 4 is arranged between the sphere 12 and the valve body 11. The gap 4 communicates with one end of the bottom hole 5. Valve seats 15 are symmetrically arranged on the left and right sides of the valve body 11. The top of the sphere 12 is connected to a handle 14 through a valve stem 13.

[0047] The gap 4 communicates with the bottom hole 5 to form a drainage channel.

[0048] The liquid control device 3 further comprises: a first cavity 37 opened in the upper middle part of the pipe body 31. A second cavity 38 is opened in the lower part of the pipe body 31 and communicates with the first cavity 37. A first opening and closing member 35 is arranged at the top of the first cavity 37. A second opening and closing member 36 is arranged at the bottom of the first cavity 37. One side of a cross plate 33 is connected to the inner wall of the lower part of the first cavity 37. The top of the cross plate 33 is connected to the first opening and closing member 35 through a first spring 32. The bottom of the cross plate 33 is connected to the top of the second opening and closing member 36 through a second spring 34.

[0049] The first opening and closing member 35 comprises: a sealing ring 356. The side surface 365 of the sealing ring 356 is connected to the inner wall of the top of the pipe body 31. A pressure groove 358 is opened in the middle position of the lower surface of the sealing ring 356. The lower surface of the sealing ring 356 near one end of the axis of the pipe body 31 is a pressure surface 359. An outer strip 351 is clamped in the pressure groove 358. The outer strip 351 is connected to an inner plate 354 through a connecting strip 352. A plurality of discharge holes 353 distributed in an annular array are penetrated through the top of the connecting strip 352. A connecting block 357 is connected to the bottom of the sealing ring 356. The bottom of the connecting block 357 is parallel to the horizontal plane. A pressure sensor 355 is arranged directly below the connecting block 357. The side surface 365 of the pressure sensor 355 is connected to the inner wall of the upper part of the pipe body 31.

[0050] The inner plate 354 is a spherical plate. Both the connecting strip 352 and the outer strip 351 are annular strips. The lower surface of the connecting strip 352 and the lower surface of the outer strip 351 are in the same plane. The upper surface of the connecting strip 352 is located below the lower surface of the outer strip 351. The upper surface of the connecting strip 352 and the upper surface of the outer strip 351 are parallel to each other.

[0051] The inner plate 354 is located between the gap 4 and the pipe body 31 and is the connecting part between the gap 4 and the pipe body 31. The top of the inner plate 354 needs to extend into the gap 4 and contact the substances in the gap 4. In order to minimize the volume of the inner plate 354 on the basis of ensuring the contact area between the inner plate 354 and the substances in the gap 4, the inner plate 354 is designed as a spherical plate. Compared with a plane, the surface area of the spherical arc surface 364 is larger, and the arc surface 364 has a radian, which is also more conducive to the substances sliding down along the arc surface 364.

[0052] The lower surface of the connecting strip 352 and the lower surface of the outer strip 351 are in the same plane, so that the connecting strip 352 and the outer strip 351 form a whole. The upper surface of the connecting strip 352 and the upper surface of the outer strip 351 are parallel to each other. The connecting strip 352 and the outer strip 351 can be regarded as a complete plate body. After cutting off the top of the plate body at one end close to the axis of the tube body 31, for the sealing ring 356, only one pressing groove 358 needs to be opened, and the sealing ring 356 can simultaneously complete the sealing connection with the connecting strip 352 and the outer strip 351.

[0053] The upper surface of the connecting strip 352 is located below the lower surface of the outer strip 351. The upper surface of the connecting strip 352 and the upper surface of the outer strip 351 are parallel to each other, so that the top of the connecting strip 352 is lower than the top of the outer strip 351. The outer strip 351 is like a wall arranged outside the connecting strip 352, and the connecting strip 352 is like a sunken ditch, which is convenient for substances to be discharged from the discharge hole 353 on the connecting strip 352, and reduces the contact between the substances and the outer strip 351.

[0054] The included angle between the connecting strip 352 and the vertical direction is smaller than the included angle between the tangent of the outer edge of the inner plate 354 and the vertical direction.

[0055] The included angle between the connecting strip 352 and the vertical direction is smaller than the included angle between the tangent of the outer edge of the inner plate 354 and the vertical direction. The connecting strip 352 has a greater inclination degree, which can not only increase the component force when the substance slides down along the surface of the connecting strip 352, but also increase the accommodation space between the connecting strip 352, the outer strip 351 and the top of the tube body 31, and reduce the possibility of impurities contacting the outer strip 351.

[0056] The pressing surface 359 is adapted to the upper surface of the connecting strip 352. When the outer strip 351 is clamped with the pressing groove 358, the pressing surface 359 abuts against the connecting strip 352. The pressing surface 359 is used to seal the discharge hole 353, and the pressing groove 358 is used to seal the outer strip 351.

[0057] The outer strip 351 and the pressing groove 358 form a sealing surface, and the pressing surface 359 and the connecting strip 352 form a sealing surface. When impurities (especially high-viscosity solutions) adhere to the surface of the connecting strip 352 and the surface of the connecting strip 352 is uneven, the contact between the connecting strip 352 and the pressing surface 359 is not tight enough, and the sealing effect is poor. However, there is a height difference between the top of the connecting strip 352 and the top of the outer strip 351, so impurities are not easily adhered to the upper part of the connecting outer strip 351, maintaining the sealing performance of the outer strip 351 and the pressing groove 358, providing additional protection when the sealing performance between the connecting strip 352 and the pressing surface 359 decreases, and improving the overall sealing performance.

[0058] The second opening / closing member 36 includes: a sealing ring 361, the sealing ring 361 is connected to the inner wall of the lower part of the first cavity 37. The cross-sectional view of one end of the sealing ring 361 after expansion is an inverted needle shape. The side away from the axis of the pipe body 31 of the sealing ring 361 is the side surface 365, and the side surface 365 is connected to the inner wall of the first cavity 37. The side of the sealing ring 361 close to the axis of the pipe body 31 is composed of an inclined surface 363 and an arc surface 364. The inclined surface 363 is located above the arc surface 364. A moving plate 362 is connected to the inner wall of the sealing ring 361.

[0059] The inclined surface 363 and the side surface 365 gradually contract along the axis direction of the pipe body 31, the arc surface 364 and the side surface 365 gradually contract along the axis direction of the pipe body 31. The distance from the top of the inclined surface 363 to the side surface 365 is greater than the distance from the bottom of the inclined surface 363 to the side surface 365. The distance from the bottom of the inclined surface 363 to the side surface 365 is equal to the distance from the top of the arc surface 364 to the side surface 365. The distance from the top of the arc surface 364 to the side surface 365 is greater than the distance from the bottom of the arc surface 364 to the side surface 365.

[0060] The diameter of the moving plate 362 is greater than the diameter of the bottom of the sealing ring 361, and the diameter of the moving plate 362 is less than the diameter of the top of the sealing ring 361. The structure of the sealing ring 361 being narrower at the top and wider at the bottom facilitates the entry of the moving plate 362 into the inside of the sealing ring 361 and also ensures that the moving plate 362 is in close contact with and seals the sealing ring 361.

[0061] During use, the top of the pipe body 31 is connected to the inner wall of the bottom hole 5, and the top of the pipe body 31 and the bottom of the bottom hole 5 are located in the same plane. The inner plate 354 protrudes and is arranged in the gap 4 between the sphere 12 and the valve body 11. The inner plate 354 is connected to the connecting plate and the outer strip 351 to form an integral plate. The integral plate is arranged between the sealing ring 356 and the first spring 32. The first spring 32 presses the connecting plate, so that the integral plate where the connecting plate is located is tightly pressed against the sealing ring 356. At this time, the pressure groove 358 is in contact with the outer strip 351 and seals the outer strip 351, and the pressure surface 359 is in contact with the upper surface of the connecting strip 352 and seals the discharge hole 353 on the connecting strip 352. At this time, the integral plate where the connecting strip 352 is located remains stationary under the elastic force of the spring and the supporting force of the sealing ring 361, and the pressure sensor 355 will not detect a pressure event. The second spring 34 pulls the moving plate 362, and the moving plate 362 moves upward along the axis direction of the sealing ring 361. The diameter of the bottom of the sealing ring 361 is larger than the diameter of the moving plate 362, and the diameter of the top of the sealing ring 361 is smaller than the diameter of the moving plate 362. The diameter of the sealing ring 361 is gradually shrinking along the vertical direction. The inner side of the bottom of the sealing ring 361 is an arc surface 364, which is convenient for the relative sliding between the inner wall of the sealing ring 361 and the moving plate 362. The gradually shrinking diameter of the sealing ring 361 is also convenient for guiding the moving plate 362 to fit with the sealing ring 361 until the sealing ring 361 and the moving plate 362 are tightly pressed together. The elastic coefficient of the second spring 34 is large. The liquid above the moving plate 362 must reach a certain quantity (which can be set according to the actual situation) so that the pressure and gravity on the top of the moving plate 362 can be greater than the sum of the elastic force and the frictional force of the second spring 34, and the moving plate 362 can move down from the first cavity 37 to the second cavity 38. The diameter of the second cavity 38 is larger than the diameter of the moving plate 362, and there is a gap 4 between the inner wall of the second cavity 38 and the moving plate 362. The moving plate 362 no longer seals the first cavity 37, and the substance in the first cavity 37 falls into the second cavity 38 and is discharged from the bottom of the pipe body 31. In order to ensure the airtightness of the gap 4, a valve can be set at the bottom of the pipe body 31. When the integral plate where the connecting plate is located is sealed with the sealing ring 356, the gap 4 is not connected to the first cavity 37, and the valve can be opened to discharge the substance.

[0062] The substance in the gap 4 between the sphere 12 and the valve body 11 cannot be carried away by the main flow of the fluid, the substance accumulates, the pressure on the inner plate 354 increases, and finally the first spring 32 continues to be compressed downward, the connecting plate is separated from the pressure surface 359, the connecting plate drives the connecting block 357 to move downward and presses the pressure sensor 355. At this time, the pressure sensor 355 detects a pressure event, the substance in the gap 4 moves onto the connecting plate and enters the first cavity 37 from the discharge hole 353. As the substance in the gap 4 decreases, the downward pressure on the first spring 32 decreases, and the first spring 32 drives the integral plate where the connecting plate is located to move up to the initial position, and the integral plate where the connecting plate is located is sealed with the sealing ring 356 again.

[0063] The opening and closing of the first opening and closing member 35 is controlled by the upward elastic force of the first spring 32 and the resultant force in the vertical downward direction of the entire plate where the inner plate 354 is located (the inner plate 354, the connecting plate, and the outer strip 351 form a single integral plate) (the sum of its own gravity and the pressure of the substances it receives). When the upward elastic force of the first spring 32 is less than the resultant force in the vertical downward direction of the entire plate where the inner plate 354 is located, the first opening and closing member 35 opens. This can not only discharge excessive substances at the bottom of the valve body 11 into the first cavity 37 to keep the gap 4 between the valve body 11 and the sphere 12 clean, but also record the opening time and opening frequency of the first opening and closing member 35 through the pressure sensor 355 to assist in inferring the reasons for the accumulation of substances at the bottom of the valve body 11.

[0064] The first cavity 37 and the second cavity 38 are separated by the second opening and closing member 36, so that there are sealing components between the gap 4, the first cavity 37, and the second cavity 38 pairwise, preventing the gap 4 from directly communicating with the second cavity 38 and even the outside of the pipe body 31. Instead, the substances in the gap 4 are discharged into the first cavity 37 and the second cavity 38 in stages. The multi-layer seals form multiple sealing barriers, which can more effectively prevent substance leakage. When there is too much substance in the gap 4, the substance can be discharged into the first cavity 37 without worrying about the direct communication between the first cavity 37 and the outside.

[0065] Embodiment 2: As Figure 1 - Figure 8 shown, an embodiment of the present invention provides a corrosion-resistant ball valve made of duplex stainless steel, including: a rotation sensor 21 is connected to the upper surface of the handle 14. The rotation sensor 21 is used to monitor the rotation of the handle 14 in real time. The rotation sensor 21 is electrically connected to a timer 23 through a wire 22. The timer 23 cooperates with the rotation sensor 21 to obtain the start and end times of the rotation of the handle 14 and the interval time between two adjacent rotations. The pressure sensor 355 is used to receive the extrusion of the connecting block 357 and obtain the start time, end time, and duration of the extrusion.

[0066] Connect the output pin of the rotation sensor 21 to the trigger pin of the timer 23. When the rotation sensor 21 detects the start of rotation, the level of its output pin changes (such as from low level to high level), and this change triggers the timer 23 to start timing and marks this moment as the start time t1 of rotation. When the rotation stops, the level of the sensor output pin changes again (such as from high level back to low level). After the timer 23 detects this change, it marks this moment as the end time of rotation and stops timing t2. At this time, the time recorded by the timer 23 is the interval time between opening the switch and closing the switch. When the rotation sensor 21 detects the start of the next rotation, it starts timing t3 again. Then the interval time between two adjacent rotations is t3 - t2.

[0067] The pressure sensor 355 synchronizes with an external clock or timing device to record time. The pressure sensor 355 can communicate with other devices in the system (such as a data acquisition card, a controller, etc.), and these external devices have precise timing functions. When the pressure sensor 355 detects a pressure event, it sends a signal to the external timing device, and the external timing device records the current time after receiving the signal. This method can utilize the high-precision timing ability of the external device to accurately record the time of the pressure event. Thus, the starting moment, ending moment, and duration of the extrusion of the pressure sensor 355 can be obtained.

[0068] Based on the time and pressure value component floor plan, the horizontal axis of the floor plan is the time axis, and the vertical axis is the pressure value axis.

[0069] The controller obtains the starting and ending moments of the rotation of the handle 14 in real time, the interval time between two adjacent rotations, the starting moment, ending moment, and duration of the extrusion, and the pressure value, and transports them into the floor plan.

[0070] According to the starting and ending moments of the rotation of the handle 14 and the interval time between two adjacent rotations, the floor plan is divided into multiple blocks, and each block has a different color. The floor plan interval within 30 seconds from the starting and ending moments of the rotation has one color, and the floor plan interval within the interval time between two adjacent rotations (excluding the time within 30 seconds from the starting and ending moments of the rotation) has another color. The pressure value is marked on the floor plan to form a pressure line, and within the time period when the pressure sensor 355 does not detect a pressure event, the pressure line is not displayed on the floor plan.

[0071] Observe the floor plan interval within 30 seconds from the starting and ending moments of the rotation. If a pressure line appears, it indicates that there is material accumulation at the bottom of the valve body 11. First, it can be assumed that the sealing performance of the ball valve has declined; if the solution in the pipe body 31 is a high-viscosity solution, it can be initially assumed that after each rotation of the sphere 12, the high-viscosity solution cannot be taken away by the main fluid in time and will gradually accumulate at the bottom of the valve body 11; if the solution contains solid impurities, particles, fibers, or other substances, it can be initially assumed that the impurities accumulate at the bottom of the valve body 11 under the action of gravity;

[0072] Then observe the floor plan interval within the interval time between two adjacent rotations. If the pressure line still continuously appears, it indicates that the ball valve has leaked. The leakage situation can be more specifically judged based on the duration of the pressure line and the level of the pressure value, and corresponding treatment can be carried out according to the leakage level; if no pressure line appears, when the solution in the pipe body 31 is a high-viscosity solution, it is very likely that the high-viscosity solution cannot be discharged from the valve body 11 in time and causes accumulation; if the solution in the tank contains solid impurities, particles, fibers, or other substances, it is very likely that the impurities are not easily discharged and cause accumulation. The subsequent maintenance process can be determined according to the specific situation and preparations can be made.

[0073] When there is no pressure line on the plan view, the gap 4 is not connected to the first cavity 37, and the valve can be opened to facilitate the substances in the first cavity 37 to flow out from the second cavity 38 and the bottom of the pipe body 31 in sequence.

[0074] A process for manufacturing a corrosion-resistant forging made of duplex stainless steel, comprising:

[0075] Hot charging of ingot into furnace: Preheat the forging heating furnace in advance to a temperature range within 100°C of the steel ingot temperature. After demoulding, transfer the hot steel ingot immediately into the forging heating furnace for heating, and slowly heat the hot steel ingot to 1200°C.

[0076] Forging and forming: Use a 60MN press to compact the surface of the ingot with small deformation, remove the ingot riser, and then perform upsetting and drawing operations on the ingot to form it, with a total of 4 - 5 heats.

[0077] Transfer of hot material to heat treatment: After forging, transfer the hot material to the heat treatment furnace for solution treatment. The heat treatment furnace needs to be preheated to 1100°C in advance and keep warm waiting for the material.

[0078] The prior art mode is cold material heating, forging and forming, and after the forging is cooled, it is transferred to heat treatment for solution treatment, and it can only produce duplex stainless steel below 5 tons. Through the production mode of hot charging of ingot into furnace - forging and forming - transfer of hot material to heat treatment, on the one hand, it shortens the heating and heat treatment heating time, saves energy, and at the same time shortens the entire manufacturing process and improves production efficiency. On the other hand, this mode can avoid cracking on the surface of the steel ingot, ensure the forming quality of the forging, and reduce the workload of subsequent grinding and machining. It can achieve the forging of duplex stainless steel above 10 tons.

[0079] Due to the composition characteristics of super duplex stainless steel, the internal structure is ferrite and austenite, and each phase occupies a large volume ratio. The σ phase is the most harmful phase, which is hard and brittle, greatly reducing the toughness and plasticity of the material. Among them, Ni and Mo elements, especially Mo element, are more likely to promote the formation of σ phase, and increase the precipitation range of σ phase to above 900℃, which means that in the medium temperature range, the precipitation time of σ phase is longer and the proportion is larger. Due to the large volume and slow cooling of large ingots, the proportion of σ phase precipitation is larger during the cooling after steelmaking or the slow heating of the ingot. The grain boundary inside the ingot is more fragile. Since the material has the characteristics of thermal expansion and contraction, internal stress will appear inside the material during the heating process. Under the joint action of internal stress and σ phase, the ingot is induced to heat and crack. In addition, there is element segregation in the smelting of large ingots. The part where Mo element gathers often becomes the source of cracks. The existing technical mode is to heat the cold material, forge and form, and then transfer the forging to heat treatment and solid solution after cooling. It can only produce duplex stainless steel below 5 tons, and the processing method is converted into: hot ingot to forging heating - forging forming - hot state to heat treatment furnace heating. After the ingot is demolded, it is immediately transferred to the heating furnace for heating in a hot state to reduce the precipitation of σ phase during the cooling process of the hot ingot and the slow heating process of the cold ingot. Reduce the internal stress of the ingot and reduce the formation of brittle phases. In the forging process, a small deformation is first used to compact the surface cast structure, and then a large deformation is used to heal the internal looseness for forging. After forging, the hot state is transferred to heat treatment and solid solution to further avoid the precipitation of σ phase during the cooling process. The entire process is operated at the upper limit of σ phase precipitation, and finally the forging of ultra-large duplex stainless steel is successfully achieved.

[0080] Hot ingots are put into the furnace: Check the equipment condition of the heating furnace, including the furnace door, heating elements, temperature control system, etc., to ensure their normal operation. According to the material and specifications of the ingot, determine the heating process parameters (such as heating temperature, heating rate, etc.), and preheat the forging heating furnace in advance to a temperature within 100°C of the ingot temperature. Lift the ingot to the vicinity of the heating furnace and prepare the lifting tools and auxiliary equipment. Use a crane or other lifting equipment to load the ingot into the heating furnace smoothly. After demolding, the hot ingot is immediately transferred to the forging heating furnace for heating, and the hot ingot is slowly heated to 1200°C. Pay attention to the placement and spacing of the ingots to ensure that the heat in the furnace is evenly distributed to avoid collisions between ingots or contact with the heating elements. According to the predetermined heating process parameters, start the heating furnace for heating. During the heating process, closely monitor the temperature changes in the furnace and ensure that the temperature is controlled within the specified range through the temperature control system. For large ingots, a longer heating time may be required to ensure that their internal structure is fully homogenized.

[0081] Forging forming: After the ingot is heated to the specified temperature, it is taken out of the heating furnace and quickly lifted and transported to the forging equipment. Check the forging equipment, such as large hydraulic presses, air hammers, etc., to ensure that the equipment is in good working condition, adjust the forging die, and ensure that the installation accuracy and clearance of the die meet the requirements. Prepare the tools required for forging, such as tongs, chopping knives, etc., and preheat them to prevent defects in the forgings caused by excessive temperature differences during forging. Use a 60MN press to compact the surface of the ingot with small deformation, remove the ingot riser, and then perform upsetting and drawing operations on the ingot to form it. The total number of heating passes is 4-5. By controlling parameters such as the forging ratio, reduction amount, and forging speed, the forgings can obtain good internal structures and mechanical properties. For example, when upsetting, the upsetting ratio should be controlled to avoid defects such as folding during the upsetting process; when drawing, the feeding should be uniform to ensure that the length and diameter of the forgings meet the requirements. During forging, the forgings need to be continuously flipped and moved to ensure that all parts can be fully forged. At the same time, pay attention to observing the surface quality and shape changes of the forgings, and promptly discover and handle possible defects, such as cracks, flash, etc. According to the size and precision requirements of the forgings, multiple forging processes and intermediate heating may be required to gradually achieve the final shape and size.

[0082] Hot material transfer to heat treatment: The heat treatment furnace needs to be preheated to 1100 °C and held for the incoming material. After forging is completed, the hot forging is quickly transferred to the heat treatment equipment. If rapid cooling processes such as quenching are used, quenching media such as oil, water, etc. should be prepared in advance, and ensure that parameters such as the temperature and flow rate of the quenching media meet the process requirements. Inspect the heat treatment equipment, such as the heat treatment furnace, cooling device, etc., to ensure that it can operate normally. According to the material and performance requirements of the forging, formulate a heat treatment process, including heating temperature, holding time, cooling method, etc. Place the forging in the heat treatment furnace and heat it according to the predetermined heat treatment process. During the heating process, strictly control the heating rate and temperature uniformity to prevent excessive thermal stress in the forging caused by too fast heating or uneven temperature. After reaching the specified heating temperature, hold for a certain period of time to fully homogenize the internal structure of the forging. The length of the holding time depends on the size, material, and specific heat treatment process requirements of the forging. After the holding is completed, cool according to the requirements of the heat treatment process. There are various cooling methods, such as air cooling, water cooling, oil cooling, etc. Different cooling methods will make the forging obtain different structures and properties. For example, water cooling has a faster speed and can obtain higher hardness and strength, but it is prone to generating larger internal stresses; oil cooling has a relatively slower cooling speed, with smaller internal stresses, but the increase in hardness and strength is relatively limited. During the cooling process, control the cooling speed and cooling time to avoid defects such as cracks and deformation in the forging caused by improper cooling. The heat-treated forging needs to undergo a comprehensive quality inspection, including appearance inspection, dimensional accuracy measurement, hardness testing, metallographic structure analysis, and mechanical property testing, etc. Through these inspection items, judge whether the forging meets the design requirements and relevant standards. If quality problems are found in the forging, analyze the reasons and take corresponding measures for improvement, such as re-performing heat treatment or repairing the defective parts, etc.

[0083] This invention covers any alternatives, modifications, equivalent methods, and solutions made on the essence and scope of this invention. For the public to have a thorough understanding of this invention, specific details are described in detail in the above preferred embodiments of this invention. However, those skilled in the art can fully understand this invention without the description of these details. Additionally, to avoid unnecessary confusion to the essence of this invention, well-known methods, processes, procedures, components, and circuits, etc. are not described in detail.

[0084] The above are only the preferred embodiments of this invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of this invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of this invention.

Claims

1. A corrosion-resistant ball valve made of duplex stainless steel, characterized in that, Comprising: A valve body (11), a bottom hole (5) is penetrated and opened at the bottom of the valve body (11), a liquid control device (3) is arranged in the bottom hole (5), the liquid control device (3) includes: a pipe body (31), a side surface (365) of the pipe body (31) is connected to the inner wall of the bottom hole (5), a first opening and closing member (35), a second opening and closing member (36), and a transverse plate (33) are arranged in the pipe body (31), two sides of the transverse plate (33) are respectively connected to one side of the first opening and closing member (35) and the second opening and closing member (36) close to each other through a first spring (32) and a second spring (34), the first opening and closing member (35) is used for controlling the opening and closing of the cavity and discharging the substances accumulated in the cavity, and the second opening and closing member (36) is used for controlling the opening and closing of the pipe body (31) and discharging the substances accumulated in the pipe body (31); Liquid control device (3), the liquid control device (3) is connected to the inner wall of the bottom hole (5). A sphere (12) is arranged inside the valve body (11). A gap (4) is provided between the sphere (12) and the valve body (11). The gap (4) is communicated with one end of the bottom hole (5). Valve seats (15) are symmetrically arranged on the left and right sides of the valve body (11). The top of the sphere (12) is connected to a handle (14) through a valve rod (13). A rotation sensor (21) is connected to the upper surface of the handle (14). The rotation sensor (21) is used to monitor the rotation of the handle (14) in real time. The rotation sensor (21) is electrically connected to a timer (23) through a wire (22). The timer (23) cooperates with the rotation sensor (21) to obtain the start and end times of the rotation of the handle (14) and the interval time between two adjacent rotations. The first opening and closing member (35) includes: a sealing ring (356). The side surface (365) of the sealing ring (356) is connected to the inner wall of the top of the pipe body (31). A pressing groove (358) is formed in the middle of the lower surface of the sealing ring (356). The lower surface of the sealing ring (356) near one end of the axis of the pipe body (31) is a pressing surface (359). An outer strip (351) is clamped in the pressing groove (358). The outer strip (351) is connected to an inner plate (354) through a connecting strip (352). A plurality of discharge holes (353) distributed in an annular array are formed through the top of the connecting strip (352). A connecting block (357) is connected to the bottom of the sealing ring (356). The bottom of the connecting block (357) is parallel to the horizontal plane. A pressure sensor (355) is arranged directly below the connecting block (357). The side surface (365) of the pressure sensor (355) is connected to the inner wall of the upper part of the pipe body (31). The pressure sensor (355) is used to receive the extrusion of the connecting block (357) and obtain the start time, end time and duration of the extrusion. The second opening and closing member (36) includes: a sealing ring (361). The sealing ring (361) is connected to the inner wall of the lower part of the first cavity (37). The cross-section of one end of the sealing ring (361) after unfolding is an inverted needle shape. The side away from the axis of the pipe body (31) of the sealing ring (361) is the side surface (365), and the side surface (365) is connected to the inner wall of the first cavity (37). The side near the axis of the pipe body (31) of the sealing ring (361) is composed of an inclined surface (363) and an arc surface (364). The inclined surface (363) is located above the arc surface (364). A moving plate (362) is connected to the inner wall of the sealing ring (361).

2. The corrosion-resistant ball valve made of duplex stainless steel according to claim 1, characterized in that The liquid control device (3) further includes: a first cavity (37) opened in the upper middle part of the pipe body (31), a second cavity (38) opened in the lower part of the pipe body (31) and communicated with the first cavity (37), a first opening and closing member (35) arranged at the top of the first cavity (37), a second opening and closing member (36) arranged at the bottom of the first cavity (37), the inner wall of the lower part of the first cavity (37) is connected to one side of a cross plate (33), the top of the cross plate (33) is connected to the first opening and closing member (35) through a first spring (32), and the bottom of the cross plate (33) is connected to the top of the second opening and closing member (36) through a second spring (34).

3. The corrosion-resistant ball valve made of duplex stainless steel according to claim 1, characterized in that: The inner plate (354) is a spherical plate, both the connecting strip (352) and the outer strip (351) are annular strips, the lower surface of the connecting strip (352) and the lower surface of the outer strip (351) are in the same plane, the upper surface of the connecting strip (352) is located below the lower surface of the outer strip (351), and the upper surface of the connecting strip (352) is parallel to the upper surface of the outer strip (351).

4. The corrosion-resistant ball valve made of duplex stainless steel according to claim 1, characterized in that: The included angle between the connecting strip (352) and the vertical direction is smaller than the included angle between the tangent of the outer edge of the inner plate (354) and the vertical direction.

5. The corrosion-resistant ball valve made of duplex stainless steel according to claim 1, wherein: The pressing surface (359) is adapted to the upper surface of the connecting strip (352). When the outer strip (351) is clamped with the pressing groove (358), the pressing surface (359) abuts against the connecting strip (352). The pressing surface (359) is used to seal the discharge hole (353), and the pressing groove (358) is used to seal the outer strip (351).

6. The corrosion-resistant ball valve made of duplex stainless steel according to claim 1, characterized in that: The inclined surface (363) and the side surface (365) gradually contract along the axis direction of the pipe body (31), the arc surface (364) and the side surface (365) gradually contract along the axis direction of the pipe body (31), the distance from the top of the inclined surface (363) to the side surface (365) is greater than the distance from the bottom of the inclined surface (363) to the side surface (365), the distance from the bottom of the inclined surface (363) to the side surface (365) is equal to the distance from the top of the arc surface (364) to the side surface (365), the distance from the top of the arc surface (364) to the side surface (365) is greater than the distance from the bottom of the arc surface (364) to the side surface (365), the diameter of the moving plate (362) is greater than the diameter of the bottom of the sealing ring (361), and the diameter of the moving plate (362) is smaller than the diameter of the top of the sealing ring (361).

7. A process for manufacturing a forging of a corrosion-resistant ball valve made of the duplex stainless steel material according to claim 1, characterized in that, Including: Ingot hot charging into the furnace: Preheat the forging heating furnace in advance to be within 100°C of the temperature difference from the steel ingot. After demoulding, the hot steel ingot is immediately transferred to the forging heating furnace for heating, and the hot steel ingot is slowly heated to 1200°C. Forging and forming: Use a 60MN press to compact the surface of the ingot with small deformation, remove the ingot riser, and then perform upsetting and drawing operations on the ingot to form it. The total number of heating passes is 4 - 5 passes. Hot material transfer to heat treatment: After forging, the hot material is transferred to the heat treatment furnace for solution treatment. The heat treatment furnace needs to be preheated to 1100°C in advance and kept warm waiting for the material.

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