Soft and hard dual-sealing plug type stop valve

Abstract

The invention relates to a soft and hard dual sealing plug type stop valve, and relates to the technical field of valves, the stop valve comprises a valve body, a valve rod, a hand wheel, a flange plate, a valve seat gland, a valve clack, a sealing assembly and a locking mechanism, the valve rod is arranged on the valve body, the hand wheel is arranged on the valve rod, the flange plate is arranged on the valve body, the valve seat gland is arranged on the valve rod, and the valve clack is arranged on the valve rod. The valve clack is arranged on the valve seat gland, the locking mechanism is arranged on the flange plate, the sealing assembly comprises a first hard seal, a second hard seal, a graphite sealing ring and TCC coating, the first hard seal is arranged on the valve body, the second hard seal is arranged on the first hard seal, the length of the second hard seal is smaller than that of the first hard seal, and the graphite sealing ring is arranged on the TCC coating. The TCC coating is arranged on the first hard seal and the second hard seal, the graphite sealing ring is arranged on the valve seat gland, a double-sealing structure is formed through the sealing assembly, the risk of medium leakage can be effectively reduced through the design, and the sealing performance of the valve is improved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a soft and hard double-sealed plug type stop valve. Background Art

[0002] The globe valve is a common fluid control valve, which is mainly used to control the flow of fluid, cut off or adjust the flow. The globe valve is widely used in various industrial pipeline systems, such as petrochemical, electric power, pharmaceutical and other industries, to control the flow and pressure of fluid. They are especially suitable for occasions that require frequent opening and closing, and perform well in situations that require high sealing.

[0003] At present, a Chinese invention patent application with a publication date of March 15, 2024 and publication number CN 117704078A proposes a durable stop valve, including a valve body, a valve cover arranged on the valve body, an inlet channel and an outlet channel opened on the valve body, a valve seat arranged between the inlet channel and the outlet channel, and a filter cartridge, the valve body being provided with a valve stem, one end of the valve stem being provided with a sealing flap sealed with the valve seat, the other end of the valve stem passing through the valve cover, the filter cartridge being arranged on the lower end of the sealing flap, the valve body being provided with a sliding block below the filter screen, the sliding block being provided with a sealing groove, the valve body being provided with a sliding device for pushing the sliding block to move toward the valve seat so as to seal the filter cartridge, a rotating rod being provided for rotation inside the filter cartridge, a brush being provided on the rotating rod, the brush resisting the inner wall of the filter cartridge so as to be able to brush the filter cartridge when the rotating rod rotates, and a rotating device for driving the rotating rod to rotate is provided on the sliding block.

[0004] However, the sealing strip on the valve disc is not resistant to high temperatures and chemical corrosion. The single-layer sealing structure cannot guarantee the reliability of the seal, which increases the risk of leakage. Especially in critical processes and hazardous media applications, the safety and stability of the system cannot be guaranteed. But relatively speaking, the use of multi-layer sealing rings may also cause the sealing rings to lose elasticity after high temperature and high pressure and cooling, thereby facing the problem of replacing the sealing rings.

[0005] Therefore, it is necessary to provide a soft and hard double sealing plug type stop valve to solve the above problems. Summary of the invention

[0006] In order to improve the sealing performance of the stop valve during use, the present invention provides a soft and hard double-sealing plug type stop valve.

[0007] The present invention provides a soft and hard double-sealed plug-type stop valve, which comprises a valve body, a valve stem, a handwheel, a flange, a valve seat cover, a valve flap, a sealing assembly and a locking mechanism. The valve stem is arranged on the valve body, the handwheel is arranged on the valve stem, the flange is arranged on the valve body, the valve seat cover is arranged on the end of the valve stem away from the handwheel, the valve flap is arranged on the end of the valve seat cover away from the valve stem, the locking mechanism is arranged on the flange, the sealing assembly comprises a first hard seal, a second hard seal, a graphite sealing ring and TCC coating, the first hard seal is arranged on the valve body, the second hard seal is arranged on the end of the first hard seal away from the valve body, the length of the second hard seal is smaller than the first hard seal, the TCC coating is arranged on the first hard seal and the second hard seal, and the graphite sealing ring is arranged on the valve seat cover.

[0008] The above-mentioned technical scheme in the embodiment of the present application has at least the following technical effects: when the operator needs to shut off the water flow, by rotating the hand wheel, the hand wheel drives the valve stem, the valve seat cover and the valve disc to move downward, and the end of the graphite sealing ring on the valve seat cover away from the valve seat cover abuts against the first hard seal, and the lower end of the graphite sealing ring abuts against the second hard seal. The graphite sealing ring contacts the first and second hard seals at the same time to form a double sealing structure. This design can effectively reduce the risk of medium leakage and improve the sealing performance of the valve.

[0009] In some embodiments, the locking mechanism includes a rotating assembly, which includes a connecting seat, a fastening plate, a rotating shaft, a transmission column, a ratchet and a rotating seat. The connecting seat is fixedly set on a flange, a circular hole is opened on the connecting seat, and the rotating shaft is fixedly set on the connecting seat through the circular hole. The fastening plate is set on the rotating shaft, and the fastening plate and the rotating shaft are rotatably connected. The transmission column is set on the fastening plate, a rotating groove is opened on the flange, and the rotating seat is rotatably set on the flange through the rotating groove. The ratchet is fixedly set on the rotating seat, and the end of the transmission column away from the fastening plate abuts against the ratchet.

[0010] In some embodiments, a connecting plate is provided on the rotating seat, and a rotating handle is provided on the connecting plate.

[0011] In some embodiments, the locking mechanism also includes a fixing component, which includes a cylinder, a shock-absorbing spring, an abutment block and a fixing block. A connecting groove is provided on the flange plate, and the cylinder is arranged on the flange plate through the connecting groove. The abutment block is arranged on the output shaft of the cylinder. One end of the shock-absorbing spring is arranged on the flange plate, and the other end of the shock-absorbing spring abuts on the abutment block. The fixing block is arranged on the end of the abutment block away from the cylinder. A fixing groove is provided on the rotating seat, and the fixing block is movably arranged in the fixing groove through the cylinder.

[0012] In some embodiments, a filter assembly is provided on the valve body, and the filter assembly includes a filter cartridge, a water inlet pipe, a connecting pipe and an outer shell. A water inlet hole is provided on the valve body, and a first through hole and a second through hole are provided on the outer shell. One end of the connecting pipe is connected to the valve body through the water inlet hole, and the outer shell is connected to the other end of the connecting pipe through the first through hole. A connecting hole is provided on the filter cartridge, and the filter cartridge is arranged on the end of the connecting pipe away from the water tank, and the filter cartridge is connected to the connecting pipe through the connecting hole. The water inlet pipe is provided on the outer shell, and the water inlet pipe is connected to the outer shell through the second through hole.

[0013] In some embodiments, the filter assembly further includes a sealing cover, a discharge port is provided at the bottom of the shell, the sealing cover is threadedly connected to the shell, and the sealing cover blocks the discharge port.

[0014] In some embodiments, the filter assembly further comprises a sealing gasket, which is disposed on the sealing cover, and an end of the sealing gasket away from the sealing cover abuts against the outer shell.

[0015] In some embodiments, an exhaust hole is provided on the valve seat cover, a first exhaust ring is provided on the valve seat cover, the first exhaust ring is connected to the exhaust hole, and a second exhaust ring is provided on the valve flap at a position corresponding to the position of the first exhaust ring.

[0016] In some embodiments, a connecting hole is provided on the valve seat cover, a fixing hole is provided at a position corresponding to the valve disc and the connecting hole, a connecting nut is provided through the connecting hole and the fixing hole, a thread line is provided in the fixing hole, and threads are provided at a position corresponding to the thread line in the fixing hole.

[0017] In some embodiments, a buffer plate is provided on one end of the valve disc away from the valve seat gland, and a buffer groove is provided on one end of the buffer plate away from the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a soft and hard double-sealed plug-type stop valve according to an embodiment of the present application; Figure 2 A schematic cross-sectional structure diagram of a soft and hard double-sealed plug-type stop valve according to an embodiment of the application; Figure 3 for Figure 2 Enlarged view of part A in the middle; Figure 4 It is a schematic diagram of the exploded structure of a locking mechanism of a soft and hard double-sealed plug-type stop valve according to an embodiment of the application; Figure 5 This is a schematic diagram of the exploded structure of a flange of a soft and hard double-sealed plug-type stop valve according to an embodiment of the application; Figure 6 for Figure 5 Enlarged view of middle part B; Figure 7 It is a schematic cross-sectional structure diagram of a filter assembly of a soft and hard double-sealed plug-type stop valve according to an embodiment of the application.

[0019] Among them, the reference numerals in the figure are: 1. Valve body; 11. Valve stem; 12. Hand wheel; 13. Flange; 14. Valve seat gland; 15. Valve disc; 2. Sealing assembly; 21. First hard seal; 22. Second hard seal; 23. Graphite seal ring; 3. Locking mechanism; 31. Rotating assembly; 311. Connecting seat; 312. Fastening plate; 313. Rotating shaft; 314. Transmission column; 315. Ratchet; 316. Rotating seat; 317. Connecting plate; 318. Rotating handle; 32. Fixed assembly Parts; 321, cylinder; 322, shock-absorbing spring; 323, abutment block; 324, fixing block; 325, fixing groove; 326, connecting groove; 4, filter assembly; 41, water inlet pipe; 42, connecting pipe; 43, outer shell; 44, filter cartridge; 45, cover; 46, sealing gasket; 5, connecting nut; 51, exhaust hole; 52, first exhaust ring; 53, second exhaust ring; 54, connecting hole; 55, fixing hole; 56, buffer plate; 57, buffer groove. DETAILED DESCRIPTION

[0020] In order to improve the sealing performance of the stop valve during use, the embodiments of the present application provide the following solution.

[0021] Please also read Figures 1 to 7 The embodiment of the present application provides a soft and hard double-sealed plug-type stop valve, which includes a valve body 1, a valve stem 11, a handwheel 12, a flange 13, a valve seat cover 14, a valve disc 15, a sealing assembly 2 and a locking mechanism 3. The valve stem 11 is arranged on the valve body 1, the handwheel 12 is arranged on the valve stem 11, the flange 13 is arranged on the valve body 1, the valve seat cover 14 is arranged on the end of the valve stem 11 away from the handwheel 12, the valve disc 15 is arranged on the end of the valve seat cover 14 away from the valve stem 11, the locking mechanism 3 is arranged on the flange 13, and the sealing assembly 2 is arranged on the valve body 1 and the valve seat cover 14.

[0022] In some embodiments, please refer to Figures 2 to 3The sealing assembly 2 includes a first hard seal 21, a second hard seal 22, a graphite sealing ring 23 and a TCC coating. The first hard seal 21 is arranged on the valve body 1, and the second hard seal 22 is arranged on the end of the first hard seal 21 away from the valve body 1. The length of the second hard seal 22 is smaller than the first hard seal 21. The TCC coating is arranged on the first hard seal 21 and the second hard seal 22, and the graphite sealing ring 23 is arranged on the valve seat cover 14.

[0023] The valve seat cover 14 is provided with an exhaust hole 51, the valve seat cover 14 is provided with a first exhaust ring 52, the first exhaust ring 52 is communicated with the exhaust hole 51, the valve flap 15 is provided with a second exhaust ring 53 at a position corresponding to the first exhaust ring 52, the valve seat cover 14 is provided with a connecting hole 54, the valve flap 15 is provided with a fixing hole 55 at a position corresponding to the connecting hole 54, a connecting nut 5 is provided through the connecting hole 54 and the fixing hole 55, a thread line is provided in the fixing hole 55, and a thread is provided on the connecting nut 5 at a position corresponding to the thread line in the fixing hole 55, a buffer plate 56 is provided on the end of the valve flap 15 away from the valve seat cover 14, and a buffer groove 57 is provided on the end of the buffer plate 56 away from the valve flap 15.

[0024] With such arrangement, when the operator needs to shut off the water flow, the operator rotates the hand wheel 12, which drives the valve stem 11, the valve seat cover 14 and the valve disc 15 to move downward. The end of the graphite sealing ring 23 on the valve seat cover 14 away from the valve seat cover 14 abuts against the first hard seal 21, and the lower end of the graphite sealing ring 23 abuts against the second hard seal 22. The graphite sealing ring 23 contacts the first and second hard seals 22 at the same time to form a double sealing structure. This design can effectively reduce the risk of medium leakage and improve the sealing performance of the valve.

[0025] At the same time, when the valve stem 11 drives the valve seat cover 14 and the valve disc 15 to compress downward to close the valve, there is a gap between the valve seat cover 14 and the valve disc 15. When the valve stem 11 is pressed downward, the valve stem 11 presses the valve seat cover 14 to compress the gap between the valve seat cover 14 and the valve disc 15. The exhaust hole 51 is used to compress the gas generated by the extrusion between the valve seat cover 14 and the valve disc 15. There is no thread at the connecting hole 54 connected to the valve seat cover 14 in the connecting nut 5, and there is a thread at the fixing hole 55 connected to the valve disc 15 in the connecting nut 5, which is convenient for squeezing the valve seat cover 14 and the valve disc 15. At the same time, squeezing the valve seat cover 14 will compress the graphite sealing ring 23, thereby enhancing the sealing degree between the graphite sealing ring 23 and the hard seal.

[0026] This double seal design effectively reduces the risk of medium leakage. The contact between the graphite seal ring 23 and the hard seal enhances the sealing performance and ensures the reliability of the valve when it is closed. By compressing the valve seat gland 14, the graphite seal ring 23 is compressed, further enhancing the sealing degree between the hard seal and the valve. The design of the exhaust hole 51 effectively avoids the seal failure caused by gas accumulation and ensures that the valve reaches the best sealing state when it is closed. This valve design significantly improves the sealing performance of the valve and reduces the risk of medium leakage through the double seal structure and gap compression exhaust mechanism. The special design of the connecting nut 5 enables the valve to effectively compress the graphite seal ring 23 during operation to ensure the reliability and stability of the seal.

[0027] In some embodiments, please refer to Figures 4 to 6 The locking mechanism 3 includes a rotating component 31, and the rotating component 31 includes a connecting seat 311, a fastening plate 312, a rotating shaft 313, a transmission column 314, a ratchet 315 and a rotating seat 316. The connecting seat 311 is fixedly arranged on the flange 13, and a circular hole is opened on the connecting seat 311. The rotating shaft 313 is fixedly arranged on the connecting seat 311 through the circular hole. The fastening plate 312 is arranged on the rotating shaft 313. The fastening plate 312 and the rotating shaft 313 are rotatably connected. The transmission column 314 is arranged on the fastening plate 312. A rotating groove is opened on the flange 13. The rotating seat 316 is rotatably arranged on the flange 13 through the rotating groove. The ratchet 315 is fixedly arranged on the rotating seat 316. One end of the transmission column 314 away from the fastening plate 312 abuts against the ratchet 315. A connecting plate 317 is provided on the rotating seat 316, and a rotating handle 318 is provided on the connecting plate 317. The locking mechanism 3 also includes a fixing assembly 32, and the fixing assembly 32 includes a cylinder 321, a shock-absorbing spring 322, an abutting block 323 and a fixing block 324. A connecting groove 326 is provided on the flange 13, and the cylinder 321 is arranged on the flange 13 through the connecting groove 326. The abutting block 323 is arranged on the output shaft of the cylinder 321. One end of the shock-absorbing spring 322 is arranged on the flange 13, and the other end of the shock-absorbing spring 322 abuts on the abutting block 323. The fixing block 324 is arranged on one end of the abutting block 323 away from the cylinder 321. A fixing groove 325 is provided on the rotating seat 316, and the fixing block 324 is movably arranged in the fixing groove 325 through the cylinder 321.

[0028] With such arrangement, the graphite sealing ring 23 may become brittle under high temperature and high pressure for a long time and lose its sealing function. When the sealing strip is damaged and needs to be replaced, the handle 318 on the connecting plate 317 can be used to rotate the handle 318 to drive the ratchet 315 and the rotating seat 316 to rotate. The ratchet 315 rotates and the transmission column 314 rotates with the rotating shaft 313 as the axis. The transmission column 314 drives the fastening plate 312 to rotate, loosening the connection between the flange 13 and the valve body 1. After the sealing strip is replaced, The rotating handle 318 on the connecting plate 317 is rotated, and the rotating handle 318 drives the ratchet 315 and the rotating seat 316 to rotate. The ratchet 315 rotates and the transmission column 314 rotates with the rotating shaft 313 as the axis. The transmission column 314 drives the fastening plate 312 to rotate, and the connection between the locking flange 13 and the valve body 1 is tightened. At the same time, the shock-absorbing spring 322 pushes the abutment block 323 and the fixing block 324, so that the fixing block 324 is locked in the fixing groove 325. The cylinder 321 is sleeved in the spring to reduce the shaking of the shock-absorbing spring 322.

[0029] In this way, the flange 13 can be loosened and locked by a simple rotation operation, which simplifies the replacement process of the sealing strip. The design of the ratchet 315 and the transmission column 314 makes the operation process fast and labor-saving. The design of the shock-absorbing spring 322 and the fixed block 324 effectively prevents the flange 13 from loosening due to vibration or pressure changes after locking, ensuring the long-term stable use of the sealing strip. The cylinder 321 is set in the spring, which effectively absorbs and reduces the vibration of the system, prolongs the service life of the sealing strip and the entire valve. The simple operation steps and reliable locking mechanism make the replacement and maintenance of the sealing strip more convenient and quick, reducing the maintenance cost and time. Through the mechanical locking and shock-absorbing device, the operation safety and sealing reliability during the replacement of the sealing strip are ensured, and the risk of medium leakage caused by poor sealing is avoided. This sealing strip replacement design provides a simple and efficient sealing strip replacement process through the synergy of the ratchet 315 and the transmission system, the shock-absorbing spring 322 and the fixed block 324 and the cylinder 321, while enhancing the stability and safety of the system. This design not only simplifies the operation steps, but also improves the reliability and durability of the equipment.

[0030] In some embodiments, please refer to Figure 1 and Figure 7The valve body 1 is provided with a filter assembly 4, which includes a filter cartridge 44, a water inlet pipe 41, a connecting pipe 42 and a shell 43. The valve body 1 is provided with a water inlet hole, the shell 43 is provided with a first through hole and a second through hole, one end of the connecting pipe 42 is connected to the valve body 1 through the water inlet hole, and the shell 43 is connected to the other end of the connecting pipe 42 through the first through hole. The filter cartridge 44 is provided with a connecting hole 54, and the filter cartridge 44 is arranged on the end of the connecting pipe 42 away from the water tank, and the through hole 54 is provided on the filter cartridge 44. The filter cartridge 44 is connected to the connecting pipe 42 through a connecting hole 54, the water inlet pipe 41 is arranged on the outer shell 43, and the water inlet pipe 41 is connected to the outer shell 43 through a second through hole. The filter assembly 4 also includes a cover 45, and a discharge port is opened at the bottom of the outer shell 43. The cover 45 is threadedly connected to the outer shell 43, and the cover 45 blocks the discharge port. The filter assembly 4 also includes a sealing gasket 46, and the sealing gasket 46 is arranged on the cover 45, and the end of the sealing gasket 46 away from the cover 45 abuts against the outer shell 43.

[0031] With such arrangement, after the valve body 1 is opened, the liquid first enters the outer shell 43 through the water inlet pipe 41, and the larger solid particles are filtered out through the filter cartridge 44, and the larger solid particles are collected in the sealing cap 45. When the liquid passes through the sealing cap 45, the liquid is sealed by the sealing gasket 46 to prevent leakage of the liquid. After the solid particles are filtered, the liquid enters the valve body 1 through the connecting pipe 42 connected to the first through hole of the filter cartridge 44, which can reduce the damage of the larger solid particles to the TCC coating on the hard seal.

[0032] In this way, filtering larger solid particles can effectively prevent these particles from entering the valve body 1, avoiding wear or damage to the internal precision parts. By reducing the wear of particles on the internal components of the valve body 1, the service life of the equipment is extended and the maintenance and replacement costs are reduced. The design of the sealing gasket 46 ensures that the liquid will not leak when passing through the cover 45, improving the sealing performance of the system. Preventing liquid leakage not only helps environmental protection, but also avoids potential safety hazards caused by liquid leakage. TCC coating is a highly wear-resistant and corrosion-resistant coating that protects it from wear by larger solid particles, which can effectively extend its service life and protect the TCC coating from damage, ensuring that the sealing performance of the valve is not affected, reducing the risk of leakage caused by coating damage. By reducing the wear of the TCC coating, the frequency of maintenance and replacement is reduced, saving maintenance costs and time. This design effectively protects the precision parts inside the valve body 1, especially the TCC coating on the hard seal, through the dual protection of filtering larger solid particles and the sealing gasket 46. By reducing wear and extending the life of the coating, not only the sealing performance and reliability of the valve are improved, but also the maintenance cost and frequency are reduced.

[0033] The implementation principle of a soft and hard double-sealed plug-type stop valve in the embodiment of the present application is as follows: when the operator needs to shut off the water flow, by rotating the hand wheel 12, the hand wheel 12 drives the valve stem 11, the valve seat gland 14 and the valve disc 15 to move downward, and the end of the graphite sealing ring 23 on the valve seat gland 14 away from the valve seat gland 14 abuts against the first hard seal 21, and the lower end of the graphite sealing ring 23 abuts against the second hard seal 22. The graphite sealing ring 23 contacts the first and second hard seals 22 at the same time to form a double sealing structure. This design can effectively reduce the risk of medium leakage and improve the sealing performance of the valve. At the same time, when the valve stem 11 drives the valve seat gland 14 and the valve disc When the valve seat cover 14 is compressed downward to close the valve, there is a gap between the valve seat cover 14 and the valve disc 15. When the valve stem 11 is pressed downward, the valve stem 11 presses the valve seat cover 14 to compress the gap between the valve seat cover 14 and the valve disc 15. The exhaust hole 51 is used to compress the gas generated by the extrusion between the valve seat cover 14 and the valve disc 15. There is no thread at the connecting hole 54 connected to the valve seat cover 14 in the connecting nut 5, and there is a thread at the fixing hole 55 connected to the valve disc 15 in the connecting nut 5, which is convenient for squeezing the valve seat cover 14 and the valve disc 15. At the same time, squeezing the valve seat cover 14 will compress the graphite sealing ring 23, thereby enhancing the sealing degree between the graphite sealing ring 23 and the hard seal. When the sealing strip is damaged and needs to be replaced, the handle 318 on the connecting plate 317 can be used to rotate the handle 318 to drive the ratchet 315 and the rotating seat 316 to rotate. The ratchet 315 rotates and the transmission column 314 rotates around the rotating shaft 313 as the axis. The transmission column 314 drives the fastening plate 312 to rotate, loosening the connection between the flange 13 and the valve body 1. After replacing the sealing strip, the handle 318 on the connecting plate 317 is rotated to drive the ratchet 315 and the rotating seat 316 to rotate. The ratchet 315 rotates and the transmission column 314 rotates around the rotating shaft 313 as the axis. The transmission column 314 drives the fastening plate 312 to rotate, locking the connection between the flange 13 and the valve body 1. At the same time, the shock-absorbing spring 322 pushes the abutment block 323 and the fixed block 324, so that the fixed block 324 is locked in the fixed groove 325, and the cylinder 321 is sleeved in the spring to reduce the shaking of the shock-absorbing spring 322. After the valve body 1 is opened, the liquid first enters the outer shell 43 through the water inlet pipe 41, and the larger solid particles are filtered out through the filter cartridge 44 and collected in the cover 45. When the liquid passes through the cover 45, the liquid is sealed by the sealing gasket 46 to prevent leakage of the liquid. After the solid particles are filtered, the liquid enters the valve body 1 through the connecting pipe 42 connected to the first through hole of the filter cartridge 44. In this way, the damage of larger solid particles to the TCC coating can be reduced.

[0034] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A soft and hard double sealing plug type stop valve, characterized by: The valve body (1) comprises a valve stem (11), a hand wheel (12), a flange (13), a valve seat cover (14), a valve flap (15), a sealing assembly (2) and a locking mechanism (3), wherein the valve stem (11) is arranged on the valve body (1), the hand wheel (12) is arranged on the valve stem (11), the flange (13) is arranged on the valve body (1), the valve seat cover (14) is arranged on an end of the valve stem (11) away from the hand wheel (12), the valve flap (15) is arranged on an end of the valve seat cover (14) away from the valve stem (11), and the locking mechanism (3) is arranged on the valve stem (11). On the flange (13), the sealing assembly (2) comprises a first hard seal (21), a second hard seal (22), a graphite sealing ring (23) and a TCC coating, wherein the first hard seal (21) is arranged on the valve body (1), the second hard seal (22) is arranged on an end of the first hard seal (21) away from the valve body (1), the length of the second hard seal (22) is shorter than the first hard seal (21), the TCC coating is arranged on the first hard seal (21) and the second hard seal (22), and the graphite sealing ring (23) is arranged on the valve seat cover (14).

2. A soft and hard double sealing plug type stop valve according to claim 1, characterized in that: The locking mechanism (3) comprises a rotating assembly (31), the rotating assembly (31) comprising a connecting seat (311), a fastening plate (312), a rotating shaft (313), a transmission column (314), a ratchet (315) and a rotating seat (316), the connecting seat (311) being fixedly arranged on the flange (13), the connecting seat (311) being provided with a circular hole, the rotating shaft (313) being fixedly arranged on the connecting seat (311) through the circular hole, and the fastening plate (312) being provided with a rotating shaft (313). The fastening plate (312) is rotatably connected to the rotating shaft (313), the transmission column (314) is arranged on the fastening plate (312), a rotation groove is provided on the flange (13), the rotating seat (316) is rotatably arranged on the flange (13) through the rotation groove, the ratchet (315) is fixedly arranged on the rotating seat (316), and one end of the transmission column (314) away from the fastening plate (312) abuts against the ratchet (315).

3. A soft and hard double sealing plug type stop valve according to claim 2, characterized in that: A connecting plate (317) is provided on the rotating seat (316), and a rotating handle (318) is provided on the connecting plate (317).

4. A soft and hard double sealing plug type stop valve according to any one of claim 3, characterized in that: The locking mechanism (3) further comprises a fixing assembly (32), the fixing assembly (32) comprising a cylinder (321), a shock absorbing spring (322), an abutting block (323) and a fixing block (324); a connecting groove (326) is provided on the flange (13); the cylinder (321) is arranged on the flange (13) via the connecting groove (326); the abutting block (323) is arranged on the output shaft of the cylinder (321); one end of the shock absorbing spring (322) is arranged on the flange (13); the other end of the shock absorbing spring (322) abuts against the abutting block (323); the fixing block (324) is arranged on one end of the abutting block (323) away from the cylinder (321); a fixing groove (325) is provided on the rotating seat (316); the fixing block (324) is movably arranged in the fixing groove (325) via the cylinder (321).

5. A soft and hard double sealing plug type stop valve according to any one of claim 4, characterized in that: The valve body (1) is provided with a filter assembly (4), the filter assembly (4) comprising a filter cartridge (44), a water inlet pipe (41), a connecting pipe (42) and a housing (43); the valve body (1) is provided with a water inlet hole, the housing (43) is provided with a first through hole and a second through hole, one end of the connecting pipe (42) is connected to the valve body (1) through the water inlet hole, the housing (43) is connected to the other end of the connecting pipe (42) through the first through hole, the filter cartridge (44) is provided with a connecting hole (54), the filter cartridge (44) is arranged on an end of the connecting pipe (42) away from the water storage tank, and the filter cartridge (44) is connected to the connecting pipe (42) through the connecting hole (54), the water inlet pipe (41) is arranged on the housing (43), and the water inlet pipe (41) is connected to the housing (43) through the second through hole.

6. A soft and hard double sealing plug type stop valve according to claim 5, characterized in that: The filter assembly (4) further comprises a sealing cover (45); a discharge outlet is provided at the bottom of the shell (43); the sealing cover (45) is threadedly connected to the shell (43), and the sealing cover (45) blocks the discharge outlet.

7. A soft and hard double sealing plug type stop valve according to claim 6, characterized in that: The filter assembly (4) further comprises a sealing gasket (46), wherein the sealing gasket (46) is arranged on the sealing cover (45), and an end of the sealing gasket (46) away from the sealing cover (45) abuts against the housing (43).

8. A soft and hard double sealing plug type stop valve according to claim 7, characterized in that: The valve seat cover (14) is provided with an exhaust hole (51), the valve seat cover (14) is provided with a first exhaust ring (52), the first exhaust ring (52) is communicated with the exhaust hole (51), and the valve flap (15) is provided with a second exhaust ring (53) at a position corresponding to the position of the first exhaust ring (52).

9. A soft and hard double sealing plug type stop valve according to claim 8, characterized in that: The valve seat gland (14) is provided with a connection hole (54), the valve flap (15) is provided with a fixing hole (55) at a position corresponding to the connection hole (54), a connection nut (5) is provided through the connection hole (54) and the fixing hole (55), a thread is provided in the fixing hole (55), and a thread is provided at a position corresponding to the thread in the fixing hole (55).

10. A soft and hard double sealing plug type stop valve according to claim 9, characterized in that: A buffer plate (56) is provided on one end of the valve disc (15) away from the valve seat gland (14), and a buffer groove (57) is provided on one end of the buffer plate (56) away from the valve disc (15).

Images