Furfural ball valve capable of realizing online blowing and lubrication

Abstract

The application discloses a furaldehyde ball valve capable of realizing online blowing and lubrication, and belongs to the technical field of furaldehyde ball valves.The furaldehyde ball valve comprises a ball valve main body, and further comprises a blowing structure, an oil injection structure, a sealing structure, a valve rod anti-flying structure and a valve seat scraper structure.Through the above manner, the valve diameter required to meet the flow requirement is reduced, and the valve cost is lowered.The valve seat scraper structure can scrape the residues on the spherical surface, and the sealing surface of the valve seat and the spherical surface of the ball are always in a state of adhesion, so that the sealing performance of the ball valve is reliable, the number of operation times for parking and maintenance is greatly reduced, and the stable and efficient operation of production is ensured.The irritating odor of furaldehyde cannot escape to the workshop, and manual blowing and smearing of lubricating grease on the spherical surface of the ball are not required, so that the physical health of the front-line personnel is ensured, and the labor intensity is reduced.

Description

Technical Field

[0001] This invention relates to the field of furfural ball valve technology, and more specifically to a furfural ball valve capable of online purging and lubrication. Background Technology

[0002] Furfural, also known as furfural, is produced from corn cobs and is a renewable product. As an important chemical raw material, its downstream applications span multiple fields, including synthetic plastics, rubber, food, pharmaceuticals, pesticides, and energy. With the accelerating pace of global energy transition, the demand for furfural will continue to grow. Developing the furfural industry can not only improve the utilization rate of corn cobs but also contribute to carbon neutrality and carbon peaking.

[0003] Due to its unique physical properties, furfural hardens and cokes when exposed to air and has an irritating odor. Therefore, the sealing performance of the valves at the feed inlet of the furfural production line is required to be extremely high. Moreover, the valves at this location need to be opened and closed at least 6-7 times a day, so the frequency of valve operation is also very important.

[0004] Currently, most valves used at the feed inlet of furfural production lines in China are eccentric V-type ball valves. The flow channel of the ball has a V-shaped cut, and this unique ball design allows for the shearing of fibrous media. Due to the eccentric design, during valve closure, the ball gradually adheres to the valve seat, tightening until the valve is fully closed; during valve opening, the ball gradually moves away from the valve seat, completely disengaging until the valve is fully open. Valves in this location are typically installed vertically, meaning the valve channel is perpendicular to the ground. Below the valve is the reaction vessel, and above the valve is a pressureless feed pipe. An open observation port is located on the pipe near the valve end to observe the feed process. After each feed, the corn cob particles remaining in the valve cavity need to be manually purged through the observation port before closing the valve. Lubricating grease is then applied to the ball surface to prevent furfural from adhering and to maintain the ball's smoothness.

[0005] However, the eccentric V-type ball valve used between the feed inlet and the reactor has the following disadvantages:

[0006] 1) Due to the eccentric structure design of the eccentric V-type ball valve, the ball and the valve seat cannot be in a constant state of contact during the valve's closing and opening process. Furfural vapor in the reactor will adhere and coke harden when it encounters air, causing corn cob particles to accumulate in the valve cavity and the valve seal to leak. Therefore, the valve has a short service life and requires a lot of maintenance, which hinders the continuous and efficient production of furfural.

[0007] 2) The corn cob that reaches this position is already broken into small particles. The shearing function of the V-shaped ball port on the V-type ball valve is not only not very useful, but the V-shaped ball port also affects the flow capacity of the valve. If the flow requirements are to be met, the valve diameter needs to be increased.

[0008] 3) After each feeding, the valve needs to be manually purged and then closed. Lubricant should be applied to the ball surface. Since furfural has an irritating odor and the temperature here is very high, this not only increases labor costs and operational risks, but also harms the health of frontline personnel.

[0009] Based on this, the present invention designs a furfural ball valve that can realize online purging and lubrication to solve the above problems. Summary of the Invention

[0010] In view of the above-mentioned shortcomings of the prior art, the present invention provides a furfural ball valve that can realize online purging and lubrication.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A furfural ball valve capable of online purging and lubrication includes a ball valve body; it also includes a purging structure, an oil injection structure, a sealing structure, a valve stem anti-flyout structure, and a valve seat scraper structure;

[0013] The purging structure, oil injection structure, sealing structure, valve stem anti-flyout structure, and valve seat scraper structure are all installed on the ball valve body.

[0014] Furthermore, the main body of the ball valve is a ball valve, which includes a valve body, a valve cover, a ball, a valve stem, a bottom cover, and a valve seat; the upper end of the ball is fixedly connected to the valve stem, and the lower end of the ball is connected to a fixed shaft through a thrust bearing, and the fixed shaft is rotatably connected to the valve body through a sliding bearing; a valve seat is provided inside the valve cover, and the valve seat and the ball form the sealing structure of the ball valve; a valve cover and a bottom cover are installed on the valve body, and the valve body and the valve cover are fixedly connected by bolts and nuts and sealed by an O-ring and a sealing gasket, and the valve body and the bottom cover are fixedly connected by screws and sealed by a sealing gasket.

[0015] Furthermore, the sealing structure includes packing, a packing sleeve, and a packing plate; the stuffing box formed between the valve body and the valve stem is filled with packing, and a packing sleeve and a packing plate are sequentially installed on the upper part of the packing, and the packing sleeve and the packing plate are fixedly connected by bolts, nuts, and washers.

[0016] Furthermore, the valve stem anti-flyout structure includes a washer, a four-ring, and a second thrust bearing; an annular groove is provided on the valve body, and a four-ring is placed in the annular groove; the valve stem adopts a T-shaped structure, and a second thrust bearing is placed between the valve stem step and the four-ring; a washer is placed inside the four-ring.

[0017] Furthermore, the valve seat scraper structure includes a gap, a sharp corner, and an oil injection boss; a layer of hard alloy is overlaid on the valve seat sealing surface and located between the valve seat sealing surface and the spherical surface of the ball, with sharp corners at both ends of the hard alloy, and a large gap is left between the valve seat and the spherical surface of the ball.

[0018] Furthermore, the purging structure includes a second check valve, a purging connector, a spring A, a second O-ring, a third O-ring, a clear hole A, a purging hole, an annular groove A, and a purging boss. The upper end of the valve cover is fixedly connected to the purging boss, which has a clear hole A and a threaded hole inside the clear hole A. The second check valve and the purging connector are respectively installed on the threaded hole. The purging connector is located above the second check valve. The valve seat has an annular groove A and a certain number of evenly distributed purging holes. The outlet end of the purging hole is located on one side of the sphere. The upper part of the purging hole passes through the annular groove A and communicates with the clear hole A on the valve cover. The second O-ring and the third O-ring are installed on both sides of the annular groove A between the valve cover and the valve seat.

[0019] Furthermore, the purge connector is connected to the air pipe of the external purge device. Clean gas enters the light hole A and the purge hole through the purge connector and check valve II to purge the residue on the sphere surface. A spring A is also installed between the valve cover and the valve seat.

[0020] Furthermore, the oil injection structure includes an oil injection boss, an annular groove B, a spring B, a clear hole B, and an oil injection port; the lower end of the valve cover is fixedly connected to the oil injection boss, which is staggered from the purging boss. The oil injection boss has a clear hole B and a threaded hole inside the clear hole B. A check valve and an oil injection connector are respectively installed on the threaded hole. The check valve is located above the oil injection connector. The valve seat has an annular groove B and a certain number of evenly distributed oil injection ports. The oil injection ports do not coincide with the purging ports. The oil injection ports pass through the annular groove B and communicate with the clear hole B on the valve cover. O-rings three and four are installed on both sides of the annular groove B, located between the valve cover and the valve seat.

[0021] Furthermore, the oil injection connector is connected to the oil pipe of an external oil injection device. Grease enters the light hole B and the oil injection hole through the oil injection connector and the check valve, and is sprayed onto the spherical surface of the ball. A spring B is also installed between the valve cover and the valve seat.

[0022] Furthermore, it also includes a bracket, which is fixedly mounted on the valve body by bolt two, nut two and washer two, and the drive device is fixedly mounted on the bracket by bolt four, nut four and washer four, with the drive end of the drive device fixedly connected to the valve stem.

[0023] Beneficial effects

[0024] This invention adopts a full-bore, global single-seat structure, with the valve flow channel diameter being consistent with the pipeline diameter, reducing the valve diameter required to meet flow requirements and lowering valve costs;

[0025] The valve seat scraper structure used in this invention can scrape off residues on the ball surface, and the valve seat sealing surface and the ball surface are always in contact, ensuring reliable sealing performance of the ball valve, greatly reducing the number of shutdown maintenance operations, and ensuring stable and efficient production operation.

[0026] The purging and oiling structures in this invention avoid the need for an open observation port on the upstream discharge pipe of the ball valve, which largely prevents furfural vapor from contacting air and causing coking. Moreover, the pungent odor of furfural will not escape into the workshop. At the same time, there is no need for manual purging of the ball or application of lubricating grease to the ball surface. This not only protects the health of front-line personnel but also reduces labor intensity, improves the automation level of the enterprise, and saves labor costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0028] Figure 1 This is a front view of a furfural ball valve according to the present invention, which enables online purging and lubrication;

[0029] Figure 2 This is a left view of a furfural ball valve according to the present invention, which enables online purging and lubrication;

[0030] Figure 3 for Figure 1 Enlarged view of point C in the middle;

[0031] Figure 4 for Figure 1 Enlarged view of point D in the middle;

[0032] Figure 5 for Figure 1 Schematic diagram of the purging structure at point A;

[0033] Figure 6 for Figure 5 Enlarged view at point E in the middle;

[0034] Figure 7 for Figure 1 Schematic diagram of the oil injection structure at point B;

[0035] Figure 8 for Figure 7 Enlarged view at point F;

[0036] Figure 9 This is a schematic diagram of the sealing structure at the valve stem in this invention;

[0037] Figure 10 This is a schematic diagram of the valve stem anti-flyout structure in this invention;

[0038] Figure 11 This is a schematic diagram of the working structure of the present invention;

[0039] Figure 12 This is a schematic diagram of the installation structure of the valve seat, valve body, and ball in this invention;

[0040] Figure 13 This is a schematic diagram of the valve seat scraper structure in this invention;

[0041] Figure 14 This is a schematic diagram illustrating the principle of the double piston effect of the valve seat in this invention.

[0042] The labels in the diagram represent:

[0043] 1. Valve body; 2. Valve cover; 3. Bolt 1; 4. Nut 1; 5. Oil filling connector; 6. Check valve 1; 7. Fixed shaft; 8. Sliding bearing 1; 9. Thrust bearing 1; 10. Ball; 11. Valve stem; 12. Check valve 2; 13. Purge connector; 14. O-ring 1; 15. Sealing gasket 1; 16. Sliding bearing 2; 17. Bracket; 18. Bolt 2; 19. Nut 2; 20. Gasket 2; 21. Bolt 3; 22. Nut 3; 23. Gasket 3; 24. Bolt 4; 25. Nut 4; 26. Gasket 4; 27. Drive unit; 28. Packing; 29. 30. Packing gland; 31. Packing plate; 32. Washer; 33. Four-ring open; 34. Thrust bearing II; 35. Sealing gasket II; 36. Screw; 37. Bottom cover; 38. Valve seat; 39. Spring A; 40. O-ring II; 41. O-ring III; 42. Smooth hole A; 43. Purge hole; 44. Smooth hole B; 45. Oil injection hole; 46. Ring groove A; 47. Purge boss; 48. Discharge pipe; 49. Observation port; 50. Ball valve; 51. Reactor; 52. Clearance; 53. Sharp corner; 54. Oil injection boss; 55. Ring groove B; 56. Spring B. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] The present invention will be further described below with reference to embodiments.

[0046] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation of the view from the front view.

[0047] In some embodiments, please refer to the appendix to the instruction manual. Figure 1-14 A furfural ball valve capable of online purging and lubrication includes a ball valve body, a purging structure, an oil injection structure, a sealing structure, a valve stem anti-flyout structure, and a valve seat scraper structure.

[0048] The sealing structure includes packing 28, packing sleeve 29 and packing plate 30; the packing gland formed between valve body 1 and valve stem 11 is filled with packing 28, and packing sleeve 29 and packing plate 30 are installed on the upper part of packing 28 in sequence. The packing sleeve 29 and packing plate 30 are fixedly connected by bolt 21, nut 22 and washer 23.

[0049] The pre-tightening sealing force is provided by the bolts, thereby compressing the packing 28 and ensuring a seal at the valve stem 11.

[0050] The valve stem anti-flyout structure includes a washer 31, a four-ring 32, and a second thrust bearing 33. An annular groove is provided on the valve body 1, and a four-ring 32 is placed in the annular groove. The valve stem 11 adopts a T-shaped structure. A second thrust bearing 33 is placed between the stepped part of the valve stem 11 and the four-ring 32. This can make the valve stem 11 bear the internal pressure evenly and reduce the frictional torque when the valve stem 11 rotates. A washer 31 is placed inside the four-ring 32 to prevent the four-ring 32 from falling out of the annular groove and to provide a flat load-bearing surface for the packing 28.

[0051] According to the background art, the ball valve 50 is usually installed vertically between the feed pipe 48 and the reactor 51. In this invention, a valve seat 37 is installed only upstream of the ball valve 50, i.e., inside the valve cover 2. The sealing surface of the valve seat 37 and the spherical surface of the ball 10 cooperate to form a seal of the ball valve 50. The valve seat 37 is not installed downstream of the ball valve 50. The transition between the inner cavity of the valve body 1 and the flow channel of the valve body 1 is set with a large transition radius to facilitate the discharge of materials from the inside of the valve cavity. An observation port 49 is sealed and fixedly installed on the feed pipe 48 to facilitate the observation of the internal situation.

[0052] The valve seat scraper structure includes a gap 52, a sharp corner 53, and an oil injection boss 54; the sealing surface of the valve seat 37 adopts a hard seal structure, and a layer of hard alloy is overlaid on the sealing surface of the valve seat 37 and between the sealing surface of the valve seat 37 and the spherical surface of the ball 10. During processing, the sharp corners 53 at both ends of the hard alloy are retained, and the hard alloy is in contact with the spherical surface of the ball 10, which can scrape off the residue or scale on the spherical surface of the ball 10, keeping the spherical surface of the ball 10 clean. In addition, a large gap 52 is left between the valve seat 37 and the spherical surface of the ball 10, so that the scale scraped off the spherical surface of the ball 10 can be discharged from the gap 52.

[0053] The purging structure includes a second check valve 12, a purging connector 13, a spring A38, a second O-ring 39, a third O-ring 40, a clear hole A42, a purging hole 43, an annular groove A46, and a purging boss 47. The upper end of the valve cover 2 is fixedly connected to the purging boss 47, which has a clear hole A42 and a threaded hole inside the clear hole A42. The second check valve 12 and the purging connector 13 are respectively installed on the threaded hole. The purging connector 13 is located above the second check valve 12. The valve seat 37 has an annular groove A46 and a certain number of evenly distributed purging holes. 43. The outlet of the purge hole 43 is located on one side of the sphere 10. The upper part of the purge hole 43 passes through the annular groove A46 and communicates with the light hole A42 on the valve cover 2. O-rings 39 and 40 are installed on both sides of the annular groove A46 between the valve cover 2 and the valve seat 37. The purge connector 13 is connected to the air pipe of the external purge device. Clean gas enters the light hole A42 and the purge hole 43 through the purge connector 13 and the check valve 12 to purge the residue on the sphere 10. A spring A38 is also installed between the valve cover 2 and the valve seat 37.

[0054] The oil injection structure includes an oil injection boss 54, an annular groove B55, a spring B56, a smooth hole B44, and an oil injection hole 45. The lower end of the valve cover 2 is fixedly connected to the oil injection boss 54, which is staggered from the purging boss 47. The oil injection boss 54 has a smooth hole B44 and a threaded hole inside the smooth hole B44. A check valve 6 and an oil injection connector 5 are respectively installed on the threaded hole. The check valve 6 is located above the oil injection connector 5. The valve seat 37 has an annular groove B55 and a certain number of evenly distributed oil injection holes 45. 5. The oil filling hole 45 and the purge hole 43 do not coincide. The oil filling hole 45 passes through the annular groove B55 and communicates with the smooth hole B44 on the valve cover 2. O-rings 3 40 and 41 are installed on both sides of the annular groove B55 between the valve cover 2 and the valve seat 37. The oil filling connector 5 is connected to the oil pipe of the external oil filling device. Grease enters the smooth hole B44 and the oil filling hole 45 through the oil filling connector 5 and the check valve 1 6, and sprays the grease onto the spherical surface of the ball 10. A spring B56 is also installed between the valve cover 2 and the valve seat 37.

[0055] The main body of the ball valve is a ball valve 50, which includes a valve body 1, a valve cover 2, a ball 10, a valve stem 11, a bottom cover 36, and a valve seat 37. The ball 10 is a full-bore, round-bottom structure ball. The upper end of the ball 10 is fixedly connected to the valve stem 11, and the lower end of the ball 10 is connected to a fixed shaft 7 via a thrust bearing 9. The fixed shaft 7 supports the ball 10 and does not rotate with the ball 10. The thrust bearing 9 provides lubrication between the two. The fixed shaft 7 is rotatably connected to the valve body 1 via a sliding bearing 8, allowing the ball 10 to rotate freely. The ball valve 50 is rotated; a valve seat 37 is set inside the valve cover 2 upstream of the ball valve 50. The valve seat 37 and the ball 10 form the sealing structure of the ball valve 50, while no valve seat 37 is set downstream of the ball valve 50; a valve cover 2 and a bottom cover 36 are installed on the valve body 1. The valve body 1 and the valve cover 2 are sealed by an O-ring 14 and a sealing gasket 15. The valve body 1 and the valve cover 2 are fixedly connected by bolts 3 and nuts 4. The valve body 1 and the bottom cover 36 are sealed by a sealing gasket 34. The valve body 1 and the bottom cover 36 are fixedly connected by screws 35.

[0056] Preferably, it also includes a bracket 17, which is fixedly mounted on the valve body 1 by bolt 18, nut 19 and washer 20. The drive device 27 is fixedly mounted on the bracket 17 by bolt 24, nut 25 and washer 26. The drive end of the drive device 27 is fixedly connected to the valve stem 11. The valve stem 11 is connected to the valve body 1 by sliding bearing 16.

[0057] The drive unit 27 provides driving torque to the valve;

[0058] Two bosses are cast into the neck of the valve cover 2 and drilled and tapped. One boss is fitted with a blow-off connector 13 and connected to an external blow-off device. The other boss is fitted with an oil injection connector 5 and connected to an external oil injection device. Blow-off holes 43 and oil injection holes 45 are also machined on the valve seat 37, which are connected to the blow-off connector 13 and the oil injection connector 5 respectively, so as to blow-off the inner cavity of the ball 10 spherical valve and spray lubricating grease onto the spherical surface of the ball 10.

[0059] The principle of this invention is as follows: A certain torque is applied to the valve stem 11 by the driving device 27 and transmitted to the ball 10, causing it to rotate 90 degrees. The through hole of the ball 10 coincides with or is perpendicular to the center line of the valve body 1 channel, thus completing the fully open or fully closed action of the ball valve 50. When the ball valve 50 is fully closed, the ball valve 50 is sealed through the valve seat 37 with the double piston effect. The double piston effect of the valve seat 37 is that the valve seat 37 is pressed under the action of the spring A38 and the spring B56, and the spring A38 and the spring B56 provide the initial pre-tight sealing force required by the ball valve 50. Because the upstream of ball valve 50 is the feed pipe 48 with atmospheric pressure, and the downstream of ball valve 50 is connected to reactor 51, where the pressure P is higher than atmospheric pressure, when ball valve 50 is closed, the valve cavity is always connected to reactor 51. Therefore, the pressure in the valve cavity and the pressure on the back of valve seat 37 (i.e., the side of spring A38) are the same as the pressure in reactor 51. O-ring 39 acts as a seal, working together with the sealing surface of valve seat 37 to isolate the upstream and downstream of ball valve 50. Because the pressure-bearing area on the back of valve seat 37 is larger than that on the valve seat... The force-bearing area on one side of the valve cavity is 37. Under the action of pressure P, the valve seat 37 continues to press the ball 10, thereby ensuring the sealing of the ball valve 50. The purging and oiling devices connected to the ball valve 50 are automated devices. After each feeding operation of the ball valve 50, the ball surface of the ball 10 is purged to keep the ball surface and valve cavity clean. Before each opening of the ball valve 50, the ball surface is automatically sprayed with grease to prevent furfural medium from sticking to the ball surface and to keep the ball surface in a lubricated state, thereby reducing the torque of the valve.

[0060] The present invention has the following technical effects:

[0061] This invention adopts a full-bore, global single-seat structure, with the valve flow channel diameter being consistent with the pipeline diameter, reducing the valve diameter required to meet flow requirements and lowering valve costs;

[0062] The valve seat scraper structure used in this invention can scrape off residues on the ball surface, and the sealing surface of the valve seat 37 and the ball surface of the ball 10 are always in contact, ensuring reliable sealing performance of the ball valve 50, greatly reducing the number of shutdown maintenance operations, and ensuring stable and efficient production operation.

[0063] The purging and oiling structures in this invention can avoid opening an open observation port on the feed pipe 48 upstream of the ball valve 50, which largely prevents furfural vapor from contacting air and causing coking. Moreover, the pungent odor of furfural will not escape into the workshop. At the same time, there is no need for manual purging of the ball 10 and application of lubricating grease to the surface of the ball 10. This not only protects the health of front-line personnel but also reduces labor intensity, improves the automation level of the enterprise, and saves labor costs.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A furfural ball valve capable of online purging and lubrication, comprising a ball valve body; characterized in that, It also includes a purging structure, an oil injection structure, a sealing structure, a valve stem anti-flyout structure, and a valve seat scraper structure; The purging structure, oil injection structure, sealing structure, valve stem anti-flyout structure, and valve seat scraper structure are all installed on the ball valve body; The purging structure includes a second check valve (12), a purging connector (13), a light hole A (42), and a purging hole (43). A purging boss (47) is fixedly connected to the upper end of the valve cover (2). The purging boss (47) has a light hole A (42) and a threaded hole inside the light hole A (42). The second check valve (12) and the purging connector (13) are installed on the threaded hole respectively. The purging connector (13) is connected to the air pipe of the external purging device. Clean gas enters the light hole A (42) and the purging hole (43) through the purging connector (13) and the second check valve (12). The oil injection structure includes an oil injection boss (54), which has a light hole B (44) and a threaded hole inside the light hole B (44). A check valve (6) and an oil injection connector (5) are installed on the threaded hole respectively. The oil injection connector (5) is connected to the oil pipe of the external oil injection device. The grease enters the light hole B (44) and the oil injection hole (45) through the oil injection connector (5) and the check valve (6), and sprays the grease onto the spherical surface of the ball (10). The valve seat scraper structure includes a gap (52), a sharp corner (53), and an oil injection boss (54); A valve seat (37) is installed in the inner cavity of the valve cover (2) upstream of the ball valve (50), and no valve seat (37) is provided downstream of the ball valve (50).

2. The furfural ball valve capable of online purging and lubrication according to claim 1, characterized in that, The main body of the ball valve is a ball valve (50), which includes a valve body (1), a valve cover (2), a ball (10), a valve stem (11), a bottom cover (36), and a valve seat (37); the upper end of the ball (10) is fixedly connected to the valve stem (11), and the lower end of the ball (10) is connected to the fixed shaft (7) through a thrust bearing (9), and the fixed shaft (7) is rotatably connected to the valve body (1) through a sliding bearing (8); a valve seat is provided inside the valve cover (2). (37) The valve seat (37) and the ball (10) form the sealing structure of the ball valve (50); the valve body (1) is equipped with a valve cover (2) and a bottom cover (36). The valve body (1) and the valve cover (2) are fixedly connected by bolts (3) and nuts (4) and sealed by O-rings (14) and gaskets (15). The valve body (1) and the bottom cover (36) are fixedly connected by screws (35) and sealed by gaskets (34).

3. The furfural ball valve capable of online purging and lubrication according to claim 2, characterized in that, The sealing structure includes packing (28), packing sleeve (29) and packing plate (30); the packing gland formed between the valve body (1) and the valve stem (11) is filled with packing (28), and the packing sleeve (29) and packing plate (30) are installed on the upper part of the packing (28) in sequence. The packing sleeve (29) and the packing plate (30) are fixedly connected by bolts (21), nuts (22) and gaskets (23).

4. The furfural ball valve capable of online purging and lubrication according to claim 3, characterized in that, The valve stem anti-flyout structure includes a washer (31), a four-ring (32), and a second thrust bearing (33); an annular groove is provided on the valve body (1), and a four-ring (32) is placed in the annular groove. The valve stem (11) adopts a T-shaped structure. A second thrust bearing (33) is placed between the step of the valve stem (11) and the four-ring (32), and a washer (31) is placed inside the four-ring (32).

5. The furfural ball valve capable of online purging and lubrication according to claim 4, characterized in that, A layer of hard alloy is overlaid on the sealing surface of the valve seat (37) and between the sealing surface of the valve seat (37) and the spherical surface of the ball (10). Both ends of the hard alloy are provided with sharp corners (53), and a gap (52) is left between the valve seat (37) and the spherical surface of the ball (10).

6. The furfural ball valve capable of online purging and lubrication according to claim 5, characterized in that, The purging structure also includes spring A (38), O-ring two (39), O-ring three (40), annular groove A (46), and purging boss (47); spring A (38) is installed between valve cover (2) and valve seat (37), purging connector (13) is located on the upper part of check valve two (12), annular groove A (46) and a certain number of evenly distributed purging holes (43) are provided on valve seat (37), the air outlet of purging hole (43) is located on one side of ball (10), the upper part of purging hole (43) passes through annular groove A (46) and communicates with light hole A (42) on valve cover (2), and O-ring two (39) and O-ring three (40) are installed on both sides of annular groove A (46) between valve cover (2) and valve seat (37).

7. The furfural ball valve capable of online purging and lubrication according to claim 6, characterized in that, The oil injection structure also includes an annular groove B (55), a spring B (56), a clear hole B (44), and an oil injection hole (45); the lower end of the valve cover (2) is fixedly connected to an oil injection boss (54), the oil injection boss (54) and the purge boss (47) are staggered, the check valve one (6) is located on the upper part of the oil injection connector (5), the valve seat (37) is provided with an annular groove B (55) and a certain number of evenly distributed oil injection holes (45), the oil injection holes (45) and the purge holes (43) are staggered, the oil injection holes (45) pass through the annular groove B (55) and communicate with the clear hole B (44) on the valve cover (2), and O-ring three (40) and O-ring four (41) are installed on both sides of the annular groove B (55) between the valve cover (2) and the valve seat (37).

8. The furfural ball valve capable of online purging and lubrication according to claim 7, characterized in that, A spring B (56) is also installed between the valve cover (2) and the valve seat (37).

9. The furfural ball valve capable of online purging and lubrication according to claim 8, characterized in that, It also includes a bracket (17), which is fixedly mounted on the valve body (1) by bolt two (18), nut two (19) and washer two (20). The drive device (27) is fixedly mounted on the bracket (17) by bolt four (24), nut four (25) and washer four (26). The drive end of the drive device (27) is fixedly connected to the valve stem (11).

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