An angle valve for electronic grade high purity gas that is easy to maintain online

Abstract

The invention discloses an angle valve for electronic-grade high-purity gas which is convenient for online maintenance. An arched elastic sealing ring is arranged on the valve seat, and the tightness of the resistance between the arched elastic sealing ring and the valve core is strengthened by elastic restoring force and fluid pressure. At the same time, the valve cover, a component of the angle valve in the prior art, is removed, and an extension tube is welded on the valve body as a whole, which is extended to the packing valve cover. The valve seat is threadedly connected to the valve body, and the valve stem, the valve core and the bellows are welded as a whole. The bellows, the valve body and the packing valve cover are sealed by two sealing rings. The valve stem is connected to a driving mechanism, and the driving mechanism drives the valve stem to move up and down to realize the switching of the valve core and the valve seat. Since the valve cover is removed, the penetration problem between the valve body and the valve cover is eliminated, and the possible leakage of the packing part is isolated by the bellows and the packing seat. By reasonably designing the matching dimensions of the valve core, the valve seat and the valve body, and the friction brought by the pressing ring, the valve seat and all other parts in the valve can be disassembled outside the cold box, which is convenient for online maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of regulating valves, in particular to an angle valve for electronic-grade high-purity gas which is convenient for online maintenance. Background Art

[0002] Angle valves for cold boxes usually include valve body, valve cover, valve core, valve stem, valve seat, and packing seal assembly. The valve body and valve cover usually adopt a sealing structure of studs, nuts and gaskets. The valve stem is sealed by the packing seal assembly. Since the valve stem drives the valve core to leave or approach the valve seat to achieve switching by moving up and down, the valve stem and the packing are dynamic seals, and external air can easily enter the valve through the valve stem gap, causing product contamination.

[0003] Some angle valves use a bellows seal structure to prevent outside air from entering the valve. This structure can meet the requirements in devices with general purity requirements. However, in electronic-grade gas devices, outside air will still penetrate into the valve through the gasket between the valve body and the valve cover, causing the product purity to decrease. At the same time, for ordinary angle valves for cold boxes, since the size of the valve core and valve seat is much larger than the size of the stuffing box part, only by disassembling the studs of the valve body and valve cover, and then removing the valve cover, can the internal parts of the valve be removed for maintenance. The valve body of the angle valve for cold boxes is generally buried deep in the insulation sand in the cold box. If the valve cover is to be removed, the insulation sand needs to be dug up, resulting in a lot of cost and time, and the convenience and economy of maintenance are very low.

[0004] In the prior art, the thrust required for the valve core and valve seat to cut off is completely provided by the actuator. At this time, a large-sized actuator is needed to meet the required thrust requirement. However, the cost of a large-sized actuator is relatively high, and air separation equipment is generally skid-mounted. In the case of high equipment space requirements, a large-sized actuator is likely to cause mutual interference with other equipment. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an angle valve for electronic grade high purity gas which is convenient for online maintenance, comprising a valve body, a stuffing valve cover, a valve stem, a valve core and a valve seat, the valve seat is threadedly connected to the valve body, a mounting portion for mounting and fixing the stuffing valve cover is coaxially arranged above the valve body, a limiting groove for embedding the bottom of the stuffing valve cover is arranged on the mounting portion, a coaxial extension cylinder is connected between the mounting portion and the valve body, the valve body, the mounting portion and the extension cylinder are welded into one body, and the valve stem passes through the valve body, the mounting portion and the extension cylinder at the same time; a bellows coaxially sleeved on the valve stem is arranged in the extension cylinder, the lower end of the bellows is welded to the outer wall of the valve stem, and a limiting ring which conflicts with the bottom of the stuffing valve cover is fixed to the upper end of the bellows; the maximum outer diameters of the valve core, the valve seat and the bellows are all smaller than the minimum inner diameters of the valve body, the extension cylinder and the inner cavity of the limiting groove;

[0006] The upper end of the valve seat is symmetrically provided with two vertical installation grooves along its own circumferential direction, and the bottom of the valve core is provided with a vertical clamping block embedded in the corresponding installation groove; an elastic sealing ring and a gasket are coaxially fixed on the inner wall of the valve seat from top to bottom, and the cross-sectional shape of the elastic sealing ring along its own circumferential direction is set to be an arch with the opening facing downward, and this opening is connected to the valve inlet, and when the valve core is inserted into the valve seat, the elastic sealing ring and the gasket are squeezed at the same time, and the arch opening is reduced after the elastic sealing ring is squeezed, and the gasket provides vertical friction when the valve core moves up and down, and a number of vertical through holes are opened at the part where the gasket contacts the valve core.

[0007] The technical solution further defined in the present invention is:

[0008] Furthermore, the elastic sealing ring includes a fixing portion with one end fixed on the inner wall of the valve seat, and the other end of the fixing portion is integrally connected with an arched portion with an opening facing downward, and the end of the arched portion facing away from the fixing portion abuts against a portion of the outer wall of the valve core inserted into the valve seat, and the arched portion is squeezed when the valve core is inserted into the valve seat, and the arched opening is reduced after the arched portion is squeezed.

[0009] As mentioned above, an angle valve for electronic-grade high-purity gas that is easy to maintain online has a sealing ring mounting platform coaxially provided on the inner wall of the valve seat, and the sealing ring mounting platform divides the inner cavity of the valve seat into a sealing ring mounting groove and a bottom through groove that are connected in sequence from top to bottom, and the inner diameter of the bottom through groove is smaller than the sealing ring mounting groove; the gasket is fixed to the upper end face of the sealing ring mounting platform, and the part of the gasket that exceeds the sealing ring mounting platform in the vertical direction is evenly arrayed with a number of vertical through holes.

[0010] As mentioned above, an angle valve for electronic-grade high-purity gas that is easy to maintain online has a pressure ring coaxially provided on the inner wall of the sealing ring mounting groove, the pressure ring abuts against the upper end surface of the fixing part of the elastic sealing ring, and the fixing part abuts against the upper end surface of the gasket; the pressure ring is penetrated by a plurality of vertical screws along its own circumferential direction, the screws pass through the fixing part and the gasket at the same time, and the lower end is threadedly connected to the sealing ring mounting platform.

[0011] As described above, in the angle valve for electronic-grade high-purity gas that is easy to maintain online, the material of the pressure ring and the elastic sealing ring is set to 316L, and the material of the gasket is set to a combination of graphite and 316L.

[0012] As described above, an angle valve for electronic grade high-purity gas which is easy to maintain online, the limit ring is pressed against the bottom wall of the limit groove by a first sealing ring, and a second sealing ring is provided between the limit ring and the bottom of the packing valve cover; a packing gland is embedded in the upper end of the packing valve cover, and the packing gland is used to press on the packing in the stuffing box in the packing valve cover, and a packing pressure plate is sleeved on the valve stem and is in contact with the upper end of the packing pressure plate, and a dust ring is connected between the packing pressure plate and the packing pressure plate, and the packing pressure plate is installed and pressed on the packing valve cover by bolts.

[0013] As described above, an angle valve for electronic-grade high-purity gas that is easy to maintain online has a packing valve cover threaded with a vertical first stud, which is also threaded to the upper end of the mounting portion, and the first stud is threaded with a first nut that abuts against the upper end of the packing valve cover; a packing pressure plate has a vertical second stud threaded with a second stud, which is also threaded to the upper end of the packing valve cover, and the second stud is threaded with a second nut that abuts against the upper end of the packing pressure plate.

[0014] As described above, an angle valve for electronic grade high purity gas which is easy to maintain online, the limiting groove includes an embedding groove for the bottom of the packing valve cover to be embedded and an intermediate groove for the bottom of the limiting ring to be embedded, the intermediate groove is connected to the bottom of the embedding groove, and the inner diameter of the intermediate groove is smaller than the embedding groove.

[0015] As described above, an angle valve for electronic grade high-purity gas which is easy to maintain online, the limit ring includes a limit part, an embedding part and a connecting part from top to bottom; the upper end of the limit part is in contact with the bottom of the packing valve cover, and a second sealing ring is in contact and connected between the two, and the lower end of the limit part is in contact with the bottom wall of the embedding groove, and a first sealing ring is in contact and connected between the lower end of the limit part and the bottom wall of the embedding groove; the embedding part is embedded in the embedding groove and in contact with the inner wall of the embedding groove; the connecting part is welded to the upper end of the bellows.

[0016] As mentioned above, an angle valve for electronic-grade high-purity gas that is easy to maintain online has a stuffing box in the stuffing valve cover that is provided with a stuffing seat, a spacer sleeve and a stuffing gland from bottom to top, the stuffing seat is located at the bottom of the stuffing box, and the stuffing gland is embedded in the upper end of the stuffing box; the spacer sleeve is mounted on the valve stem to separate the stuffing in the stuffing box into two groups, upper and lower.

[0017] The beneficial effects of the present invention are:

[0018] (1) In the present invention, the elastic sealing ring has sufficient elasticity due to its own material properties and the shape of the arched portion, so that when the valve core squeezes it, the elastic restoring force makes the elastic sealing ring and the valve core more tightly in contact, thereby enhancing the sealing performance of the entire valve; at the same time, the fluid pressure will always make the arched portion have a tendency to open, that is, the arched opening has a tendency to return to its original state, thereby further enhancing the tightness of the resistance between the elastic sealing ring and the valve core, and further improving the sealing performance of the valve; at the same time, the arc-shaped sealing ring can significantly reduce the thrust required for the valve to cut off with the help of the force provided by the fluid pressure, reducing the size of the actuator, thereby reducing the cost of the whole machine and improving the product competitiveness;

[0019] (2) In the present invention, the valve body and the extension tube are welded into one body, eliminating the sealing structure of the valve body and the valve cover through the studs, nuts and gaskets in the existing valve structure, thereby eliminating the leakage point here and preventing the external air from penetrating into the valve through the gasket here and contaminating the product; at the same time, in addition to the traditional packing sealing structure, the upper part of the valve stem is also sealed with a bellows sealing structure. The bellows and the valve stem are welded into a whole, and the bellows and the packing valve cover and the extension tube are sealed by a double-layer sealing ring; through this sealing structure, the purity of the product can meet the purity requirements of electronic grade gas;

[0020] (3) In the present invention, the maximum outer diameters of the valve core, valve seat and bellows are all smaller than the minimum inner diameters of the valve body, extension tube and inner cavity of the limit groove. Therefore, when the valve fails or internal parts are damaged, the valve stem, bellows, valve core and valve seat and other components can be directly replaced from the top of the extension tube without digging out the insulation sand in the cold box or removing the entire angle valve from the pipeline. All parts in the valve can be disassembled outside the cold box, which saves time and effort and facilitates online maintenance of the entire angle valve.

[0021] (4) In the present invention, the setting of the packing seat can effectively prevent the packing from being pressed into the hole below; the setting of the spacer and the grease can ensure that the packing and the valve stem are always well lubricated; the coordinated use of the packing pressure plate and the packing gland ensures the seal between the packing and the valve stem; the setting of the dust ring can effectively prevent external dust from entering between the valve stem and the packing when the valve stem moves up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0024] Figure 3 for Figure 1 The enlarged schematic diagram of point B in the middle;

[0025] Figure 4 It is a schematic diagram of the structure of the limiting groove in an embodiment of the present invention;

[0026] Figure 5 for Figure 1 The enlarged schematic diagram of the center C;

[0027] Figure 6 This is a schematic diagram of the use of an angle valve in a cold box according to an embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the connection between the valve body and the valve core in an embodiment of the present invention.

[0029] Among them: 1. Valve body; 2. Stuffing valve cover; 3. Valve stem; 4. Valve core; 41. Vertical clamp; 5. Valve seat; 51. Mounting groove; 6. Mounting part; 7. Limiting groove; 71. Embedding groove; 72. Middle groove; 8. Extension tube; 9. Bellows; 10. Limiting ring; 101. Limiting part; 102. Embedding part; 103. Connecting part; 11. Elastic sealing ring; 111. Fixed part; 112. Arched part; 12. Gasket; 121. Through hole ; 13. Sealing ring mounting platform; 14. Sealing ring mounting groove; 15. Bottom through groove; 16. Pressing ring; 17. Screw; 18. First sealing ring; 19. Second sealing ring; 20. Packing gland; 21. Packing; 22. Packing pressure plate; 23. Dustproof ring; 24. First stud; 25. First nut; 26. Second stud; 27. Second nut; 28. Packing seat; 29. ​​Spacer; 30. Pipeline; 31. Cold box; 32. Pearlescent sand. DETAILED DESCRIPTION

[0030] This embodiment provides an angle valve for electronic grade high purity gas that is easy to maintain online, such as Figures 1 to 5 As shown, it includes a valve body 1, a stuffing valve cover 2, a valve stem 3, a valve core 4 and a valve seat 5. The guide surfaces of the valve core 4 and the valve body 1 are matched with a small gap. The gap between the two is set to 0.075mm, which belongs to a tolerance match. Through reasonable guide matching dimension design, it is ensured that the valve core 4 and the valve seat 5 are always kept in the center, and the sealing surface of the valve core 4 and the sealing surface of the valve seat 5 cooperate to form a sealing pair; the valve seat 5 is threadedly connected to the valve body 1, and a mounting portion 6 for fixing the stuffing valve cover 2 is coaxially provided above the valve body 1. A vertical first stud 24 is threadedly connected to the stuffing valve cover 2, and the first stud 24 is also threadedly connected to the upper end of the mounting portion 6. A first nut 25 that abuts against the upper end of the stuffing valve cover 2 is threadedly connected to the first stud 24.

[0031] Two vertical mounting grooves 51 are symmetrically provided at the upper end of the valve seat 5 along its own circumferential direction. A vertical clamping block 41 embedded in the corresponding mounting groove 51 is provided at the bottom of the valve core 4, and the vertical clamping block 41 matches the shape of the mounting groove 51; a pressure ring 16, an elastic sealing ring 11 and a gasket 12 are coaxially fixed on the inner wall of the valve seat 5 from top to bottom. The material of the pressure ring 16 and the elastic sealing ring 11 is set to 316L, and the material of the gasket 12 is set to a combination of graphite and 316L, and multiple layers of 316L are arranged at intervals up and down by wrapping graphite.

[0032] The elastic sealing ring 11 includes a fixing portion 111 fixed to the inner wall of the valve seat 5 at one end, and the other end of the fixing portion 111 is integrally connected with an arched portion 112 with an opening facing downward, and this opening is communicated with the valve inlet, and the end of the arched portion 112 away from the fixing portion 111 abuts against a portion of the outer wall of the valve core 4 inserted into the valve seat 5, and the valve core 4 squeezes the arched portion 112 when inserted into the valve seat 5, and the arched opening is reduced after the arched portion 112 is squeezed.

[0033] A sealing ring mounting platform 13 is coaxially provided on the inner wall of the valve seat 5, and the sealing ring mounting platform 13 divides the inner cavity of the valve seat 5 into a sealing ring mounting groove 14 and a bottom through groove 15 which are connected in sequence from top to bottom, and the inner diameter of the bottom through groove 15 is smaller than the sealing ring mounting groove 14; the gasket 12 is fixed to the upper end surface of the sealing ring mounting platform 13, and the part of the gasket 12 that exceeds the sealing ring mounting platform 13 in the vertical direction is uniformly arrayed with a number of vertical through holes 121, thereby avoiding the situation where the gasket 12 affects the fluid and conflicts with the elastic sealing ring 11; the valve core 4 squeezes the gasket 12 when it is inserted into the valve seat 5, and the gasket 12 provides vertical friction when the valve core 4 moves up and down.

[0034] The pressure ring 16 abuts against the upper end surface of the fixing portion 111 of the elastic sealing ring 11, and the fixing portion 111 abuts against the upper end surface of the gasket 12; the pressure ring 16 is penetrated by a plurality of vertical screws 17 along its own circumferential direction, the screws 17 pass through the fixing portion 111 and the gasket 12 at the same time, and the lower end is threadedly connected to the sealing ring mounting platform 13, and 8 screws 17 are arranged at equal intervals along the circumferential direction of the pressure ring 16.

[0035] A limiting groove 7 is provided on the mounting portion 6 for the bottom of the stuffing valve cover 2 to be embedded. The limiting groove 7 includes an embedding groove 71 and an intermediate groove 72 for the bottom of the stuffing valve cover 2 to be embedded. The intermediate groove 72 is connected to the bottom of the embedding groove 71, and the inner diameter of the intermediate groove 72 is smaller than the embedding groove 71; a coaxial extension tube 8 is connected between the mounting portion 6 and the valve body 1, and the valve body 1, the mounting portion 6 and the extension tube 8 are welded together to eliminate the leakage point here and prevent external air from penetrating into the interior of the valve body 1; the valve stem 3 passes through the valve body 1, the mounting portion 6 and the extension tube 8 at the same time.

[0036] A bellows 9 sleeved on the valve stem 3 is arranged inside the extension tube 8. The bellows 9 is coaxially arranged with the valve stem 3. The lower end of the bellows 9 is welded to the outer wall of the valve stem 3. A limiting ring 10 that conflicts with the bottom of the packing valve cover 2 is fixed to the upper end of the bellows 9. The limiting ring 10 includes a limiting portion 101, an embedding portion 102 and a connecting portion 103 from top to bottom; the upper end of the limiting portion 101 conflicts with the bottom of the packing valve cover 2, and a second sealing ring 19 is connected in a conflicting manner between the two, and a first sealing ring 18 is connected in a conflicting manner between the lower end of the limiting portion 101 and the bottom wall of the embedding groove 71. The first The sealing ring 18 and the second sealing ring 19 are both configured as wound gaskets, which include an outer ring and an inner ring made of 316L, and PTFE material is filled between the outer ring and the inner ring to form a sealing pair. On the one hand, this structure prevents the air that penetrates into the space between the packing valve cover 2 and the bellows 9 due to the up and down movement of the valve stem 3 and the packing 21 from entering the interior of the valve body 1; on the other hand, it can prevent the air outside the angle valve from penetrating into the interior of the valve body 1; the embedded portion 102 is embedded in the embedded groove 71 and conflicts with the inner wall of the embedded groove 71; the connecting portion 103 is welded to the upper end of the bellows 9.

[0037] A packing gland 20 is embedded in the upper end of the packing valve cover 2. The packing gland 20 is used to press on the packing 21 in the stuffing box in the packing valve cover 2. A packing pressure plate 22 is sleeved on the valve stem 3 and contacts the upper end of the packing pressure plate 20. A dust ring 23 is connected between the packing pressure plate 22 and the packing pressure plate 20 to prevent external dust from entering between the valve stem 3 and the packing 21 when the valve stem 3 moves up and down. The packing pressure plate 22 is installed and pressed on the packing valve cover 2 by bolts. A vertical second stud 26 is threadedly connected to the packing pressure plate 22. The second stud 26 is also threadedly connected to the upper end of the packing valve cover 2. A second nut 27 that contacts the upper end of the packing pressure plate 22 is threadedly connected to the second stud 26. The packing pressure plate 22 provides a downward force through the stud nut to press the packing 21 to ensure the seal between the packing 21 and the valve stem 3.

[0038] The stuffing box in the stuffing valve cover 2 is provided with a stuffing 21 seat, a spacer sleeve 29 and a stuffing gland 20 from bottom to top. The stuffing 21 seat is arranged at the bottom of the stuffing box to prevent the stuffing 21 from being pressed into the hole below; the stuffing gland 20 is embedded in the upper end of the stuffing box; the spacer sleeve 29 is sleeved on the valve stem 3 to separate the stuffing 21 in the stuffing box into two groups, upper and lower, and grease is stored in the spacer sleeve 29 to ensure the sealing between the stuffing 21 and the valve stem 3.

[0039] The maximum outer diameters of the valve core 4 , valve seat 5 and bellows 9 are all smaller than the minimum inner diameters of the valve body 1 , extension tube 8 and inner cavity of the limiting groove 7 , and the maximum outer diameter of the valve seat 5 is at least 2 mm smaller than the minimum inner diameter of the valve body 1 and extension tube 8 .

[0040] like Figure 6 As shown, after the angle valve is welded to the pipe 30, it is deeply buried in the cold box 31, and the cold box 31 is filled with pearl sand 32. Figure 7 As shown, the valve core 4 and the guide surface of the valve body 1 are matched with a small gap, the gap between the two is set to 0.075mm, and the maximum outer diameter of the valve seat 5 is at least 2mm smaller than the minimum inner diameter of the valve body 1 and the extension tube 8.

[0041] When the valve is in normal use, after the valve is closed, the valve core 4 is inserted into the valve seat 5, and the outer wall of the inserted part of the valve core 4 simultaneously contacts the elastic sealing ring 11 and the gasket 12, and squeezes the two. After the elastic sealing ring 11 is squeezed, the arched opening is reduced. Due to its material characteristics, the arched portion 112 of the elastic sealing ring 11 always has elastic restoring force, so that the contact between the elastic sealing ring 11 and the valve core 4 is tighter, thereby enhancing the sealing performance of the entire valve.

[0042] In addition, since the opening of the arched portion 112 of the elastic sealing ring 11 is connected to the valve inlet, when the valve is in a closed state, the fluid at the valve inlet end passes through the through hole 121 on the gasket 12 and collides with the arched portion 112, and fills the opening of the arched portion 112. At this time, the fluid pressure will make the arched portion 112 always have a tendency to open, that is, the arched opening has a tendency to return to its original state, thereby further strengthening the tightness of the conflict between the elastic sealing ring 11 and the valve core 4, and further improving the sealing performance of the valve; and the arc-shaped sealing ring can significantly reduce the thrust required for the valve to cut off with the help of the force provided by the fluid pressure, reducing the size of the actuator, thereby reducing the cost of the whole machine and improving the product competitiveness.

[0043] When the valve needs maintenance, first remove the second stud 26 and the second nut 27, then remove the packing plate 22, the dust ring 23 and the packing cover 20 in turn, then remove the first nut 25 and the second stud 26, and then remove the packing valve cover 2, and then move the valve stem 3 downward, and the valve stem 3 drives the valve core 4 to move downward until the vertical block 41 at the bottom of the valve core 4 contacts the upper end of the valve seat 5, then rotate the valve stem 3 and apply downward force at the same time until the vertical blocks 41 at the bottom of the valve core 4 are all stuck in the installation groove 51, at this time, the outer wall of the valve core 4 contacts the gasket 12 and squeezes it.

[0044] Then, the valve stem 3 is rotated along the thread direction of the connection between the valve seat 5 and the valve body 1, and the valve seat 5 is completely loosened from the valve body 1 by rotating the vertical clamping block 41 on the valve seat 5; at this time, the outer wall of the valve core 4 always contacts and squeezes the gasket 12. Due to the material characteristics of the gasket 12, there is sufficient friction between the bottom of the valve core 4 and the gasket 12. Therefore, an upward force is applied to the valve stem 3 at this time, so that the valve seat 5 can be removed from the valve body 1. At the same time, the assembly consisting of the valve stem 3, the valve core 4 and the bellows 9 is also taken out together, so that all the internal parts of the valve can be disassembled outside the cold box 31 for online maintenance.

[0045] The setting of the gasket 12 not only provides sufficient friction for the removal of the valve seat 5, but also cooperates with the screw 17 to tightly clamp the elastic sealing ring 11 between the gasket 12 and the pressure ring 16, so that the elastic sealing ring 11 can be more firmly fixed in the valve seat 5, making the contact between it and the valve core 4 tighter, thereby improving the sealing performance of the entire valve.

[0046] On the one hand, the sealing structure of this embodiment is completely redesigned to enhance the sealing of the product, which can effectively prevent air from penetrating into the interior of the angle valve to avoid contamination of the final product. This design improvement significantly improves the overall quality and stability of the product.

[0047] On the other hand, this embodiment is specially designed for the matching dimensions and structures between the valve body 1, the extension tube 8 and the valve internal parts. This design allows the internal parts of the angle valve to be easily repaired and replaced outside the cold box 31, greatly improving the convenience and efficiency of maintenance. This not only reduces the maintenance cost, but also significantly reduces the production downtime, effectively improves the production efficiency, and has important practical value and market prospects.

[0048] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. An angle valve for electronic grade high purity gas that is easy to maintain online, comprising a valve body (1), a packing valve cover (2), a valve stem (3), a valve core (4) and a valve seat (5), characterized in that: The angle valve is used for a cold box. The valve seat (5) is threadedly connected to the inside of the valve body (1). A mounting portion (6) for mounting and fixing a stuffing valve cover (2) is coaxially provided above the valve body (1). A limiting groove (7) is provided on the mounting portion (6) for the bottom of the stuffing valve cover (2) to be embedded. A coaxial extension tube (8) is connected between the mounting portion (6) and the valve body (1). The valve body (1), the mounting portion (6) and the extension tube (8) are welded together. The valve stem (3) passes through the valve body (1) at the same time. ), a mounting portion (6) and an extension tube (8); a bellows (9) coaxially sleeved on the valve stem (3) is provided in the extension tube (8); the lower end of the bellows (9) is welded to the outer wall of the valve stem (3), and the upper end of the bellows (9) is fixed with a limit ring (10) that contacts the bottom of the packing valve cover (2); the maximum outer diameters of the valve core (4), the valve seat (5) and the bellows (9) are all smaller than the minimum inner diameters of the inner cavity of the valve body (1), the extension tube (8) and the limit groove (7); The upper end of the valve seat (5) is symmetrically provided with two vertical installation grooves (51) along its own circumferential direction, and the bottom of the valve core (4) is provided with a vertical clamping block (41) embedded in the corresponding installation groove (51); an elastic sealing ring (11) and a gasket (12) are coaxially fixed on the inner wall of the valve seat (5) from top to bottom, and the cross-sectional shape of the elastic sealing ring (11) along its own circumferential direction is set to be an arch with an opening facing downward, and this opening is connected to the valve inlet, and when the valve core (4) is inserted into the valve seat (5), the elastic sealing ring (11) and the gasket (12) are squeezed at the same time, and the arch opening is reduced after the elastic sealing ring (11) is squeezed, and when the valve core (4) moves up and down, the gasket (12) provides vertical friction force, and a portion of the gasket (12) that contacts the valve core (4) is provided with a plurality of vertical through holes (121); The elastic sealing ring (11) comprises a fixing portion (111) having one end fixed to the inner wall of the valve seat (5); the other end of the fixing portion (111) is integrally connected with an arched portion (112) with an opening facing downward; an end of the arched portion (112) facing away from the fixing portion (111) abuts against a portion of the outer wall of the valve core (4) inserted into the valve seat (5); when the valve core (4) is inserted into the valve seat (5), the arched portion (112) is squeezed, and the arched opening is reduced after the arched portion (112) is squeezed; A sealing ring mounting platform (13) is coaxially provided on the inner wall of the valve seat (5), and the sealing ring mounting platform (13) divides the inner cavity of the valve seat (5) into a sealing ring mounting groove (14) and a bottom through groove (15) which are connected in sequence from top to bottom, and the inner diameter of the bottom through groove (15) is smaller than the sealing ring mounting groove (14); a gasket (12) is fixed to the upper end surface of the sealing ring mounting platform (13), and a portion of the gasket (12) that exceeds the sealing ring mounting platform (13) in the vertical direction has a plurality of vertically penetrating through holes (121) arranged in a uniform array; A pressing ring (16) is coaxially arranged on the inner wall of the sealing ring mounting groove (14), the pressing ring (16) abuts against the upper end surface of the fixing portion (111) of the elastic sealing ring (11), and the fixing portion (111) abuts against the upper end surface of the gasket (12); the pressing ring (16) is provided with a plurality of vertical screws (17) along its circumferential direction, the screws (17) simultaneously pass through the fixing portion (111) and the gasket (12), and the lower ends of the screws (17) are threadedly connected to the sealing ring mounting platform (13).

2. The angle valve for electronic grade high purity gas that is easy to maintain online according to claim 1 is characterized in that: The material of the pressure ring (16) and the elastic sealing ring (11) is set to 316L, and the material of the gasket (12) is set to a combination of graphite and 316L.

3. The angle valve for electronic grade high purity gas that is easy to maintain online according to claim 1 is characterized in that: The limiting ring (10) is pressed against the bottom wall of the limiting groove (7) through a first sealing ring (18); a second sealing ring (19) is provided between the limiting ring (10) and the bottom of the packing valve cover (2); a packing gland (20) is embedded in the upper end of the packing valve cover (2); the packing gland (20) is used to press on the packing (21) in the packing box in the packing valve cover (2); a packing pressure plate (22) is sleeved on the valve stem (3) and is pressed against the upper end of the packing gland (20); a dust ring (23) is connected between the packing pressure plate (22) and the packing gland (20); the packing pressure plate (22) is installed and pressed against the packing valve cover (2) by bolts.

4. The angle valve for electronic grade high purity gas that is easy to maintain online according to claim 3 is characterized in that: The packing valve cover (2) is threadedly connected to a first vertical stud (24), the first stud (24) is threadedly connected to the upper end of the mounting portion (6), and the first stud (24) is threadedly connected to a first nut (25) that abuts against the upper end of the packing valve cover (2); the packing pressure plate (22) is threadedly connected to a second vertical stud (26), the second stud (26) is threadedly connected to the upper end of the packing valve cover (2), and the second stud (26) is threadedly connected to a second nut (27) that abuts against the upper end of the packing pressure plate (22).

5. The angle valve for electronic grade high purity gas that is easy to maintain online according to claim 3 is characterized in that: The limiting groove (7) comprises an embedding groove (71) for the bottom of the packing valve cover (2) to be embedded, and an intermediate groove (72) for the bottom of the limiting ring (10) to be embedded, the intermediate groove (72) being connected to the bottom of the embedding groove (71), and the inner diameter of the intermediate groove (72) is smaller than that of the embedding groove (71).

6. The angle valve for electronic grade high purity gas that is easy to maintain online according to claim 5 is characterized in that: The limiting ring (10) comprises, from top to bottom, a limiting portion (101), an embedding portion (102) and a connecting portion (103); the upper end of the limiting portion (101) abuts against the bottom of the packing valve cover (2), and a second sealing ring (19) is abutted and connected therebetween; the lower end of the limiting portion (101) abuts against the bottom wall of the embedding groove (71), and a first sealing ring (18) is abutted and connected therebetween; the embedding portion (102) is embedded in the embedding groove (71), and abuts against the inner wall of the embedding groove (71); and the connecting portion (103) is welded to the upper end of the bellows (9).

7. The angle valve for electronic grade high purity gas that is easy to maintain online according to claim 3 is characterized in that: The stuffing box in the stuffing valve cover (2) is provided with a stuffing (21) seat, a spacer sleeve (29) and a stuffing gland (20) in order from bottom to top. The stuffing (21) seat is arranged at the bottom of the stuffing box, and the stuffing gland (20) is embedded in the upper end of the stuffing box. The spacer sleeve (29) is sleeved on the valve stem (3) and is used to separate the stuffing (21) in the stuffing box into two groups, upper and lower.

Images