Valve for online maintenance

Abstract

An on-line maintenance valve, comprising a valve body, a valve core and a first sealing assembly. The valve body is provided with an inlet and an outlet, and there is a valve cavity inside the valve body. The valve core is rotatably installed in the valve cavity. The first sealing assembly is installed on the valve core and can open / close the inlet or the outlet under the drive of the valve core. The valve also includes a movable part. The valve body is provided with a maintenance port. The movable part is installed at the maintenance port and is hermetically connected to the valve body. The valve core can rotate and switch between the inlet or the outlet and the maintenance port. When the valve needs to be maintained, the movable part can be in sealing contact with the valve core to isolate the valve cavity from the maintenance port and make the first sealing assembly located inside the maintenance port. When the on-line maintenance valve is working normally, the movable part is disengaged from the valve core in terms of sealing, and the valve cavity is communicated with the maintenance port. The advantages of the present invention are as follows: when maintenance is required, the valve core separates the valve cavity and the maintenance port, and maintenance personnel can perform maintenance inside the maintenance port, while the inlet and the outlet are still communicated, which does not affect the normal operation of the pipeline system and reduces economic losses.

Description

Technical Field

[0001] The present invention relates to the field of pipeline systems, and particularly to a valve for on-line maintenance. Background Art

[0002] In a pipeline system, a valve is usually installed to close and cut off the water source in case of emergency. However, the sealing element or other vulnerable parts in the valve will be damaged during long-term use, resulting in leakage of the valve and the need to replace the vulnerable parts.

[0003] In the existing technology, before repairing the valve, the operation of the pipeline system needs to be stopped first, and it is impossible to repair the valve when the pipeline is running normally, which causes inconvenience in maintenance. Summary of the Invention

[0004] Based on this, in view of the above technical problems, the present invention provides a valve for on-line maintenance, and the technical solution is as follows:

[0005] A valve for on-line maintenance includes a valve body, a valve core and a first sealing assembly. An inlet and an outlet are oppositely arranged on the valve body. A valve cavity communicating with the inlet and the outlet respectively is formed in the valve body. The valve core is rotatably installed in the valve cavity. The first sealing assembly is installed on the valve core and can open / close the inlet or the outlet under the drive of the valve core. The valve for on-line maintenance further includes a movable member. An inspection opening communicating with the valve cavity is formed on the valve body. The movable member is installed at the inspection opening and is sealingly connected with the valve body. The valve core can switch and rotate between the inlet or the outlet and the inspection opening. When the valve needs to be maintained, the movable member can be in sealing contact with the valve core to isolate the valve cavity from the inspection opening and make the first sealing assembly located in the inspection opening. When the valve for on-line maintenance is working normally, the movable member is disengaged from the valve core in terms of sealing, and the valve cavity is communicated with the inspection opening.

[0006] With such a setting, when maintenance is required, the valve core separates the valve cavity and the inspection opening, and the maintenance personnel can perform maintenance in the inspection opening, while the inlet and the outlet are still communicated, which does not affect the normal operation of the pipeline system and reduces economic losses.

[0007] In an embodiment of the present invention, the valve for on-line maintenance further includes a valve cover, and the valve cover covers the movable member and can seal one end of the movable member away from the inspection opening.

[0008] In an embodiment of the present invention, a drain hole is formed in the valve cover, the drain hole is communicated with the inspection opening, and a control member is arranged at the orifice of the drain hole.

[0009] With such a setting, the drain hole can drain the liquid in the inspection opening. When inspection is not required, the control member is used to close the drain hole.

[0010] In an embodiment of the present invention, the valve for on-line maintenance further includes an adjustment unit, the adjustment unit is installed at one end of the movable member, and the adjustment unit can drive the movable member to move.

[0011] With such a setting, through the adjustment unit, the communication or isolation between the valve cavity and the inspection opening can be controlled.

[0012] In an embodiment of the present invention, one end of the movable member away from the adjustment unit extends into the inspection opening and can move along the axial direction of the inspection opening, and the adjustment unit can adjust the depth of the movable member extending into the inspection opening.

[0013] In an embodiment of the present invention, the adjustment unit includes a connecting member and a first adjustment member. One end of the movable member away from the valve core is provided with a first boss in the radial direction. One end of the connecting member passes through the first boss and is connected to the valve body. The first adjustment member is rotatably connected to the connecting member and can move along the axial direction of the connecting member.

[0014] With such a setting, by adjusting the cooperation between the connecting member and the first adjustment member, the position of the movable member extending into the inspection opening is adjusted.

[0015] In an embodiment of the present invention, one end of the valve cover is provided with a second boss in the radial direction. The adjustment unit further includes a second adjustment member. One end of the connecting member extends out of the first boss and passes through the second boss and is connected to the second adjustment member to lock the valve cover to the first boss.

[0016] With such a setting, the second adjustment member cooperates with the first adjustment member close to the valve cover to fix the valve cover.

[0017] In an embodiment of the present invention, a connection hole communicating with the valve cavity is opened on the valve body. The valve core further includes a valve shaft. The valve shaft is connected to the valve core and passes through the connection hole and extends out of the valve body from the connection hole.

[0018] In an embodiment of the present invention, the valve core further includes a contact portion. The contact portion is provided with a first sealing groove in the circumferential direction. The first sealing assembly includes a first sealing member arranged in the first sealing groove. The first sealing member can abut against the side wall of the inlet / the outlet; a second sealing groove is circumferentially opened on the inner side wall of the movable member close to the valve core. A second sealing member is arranged in the second sealing groove. The second sealing member contacts the contact portion to form a seal.

[0019] This is set so that the contact part can seal the inlet / outlet and can also seal the movable part.

[0020] In an embodiment of the present invention, the inner side of the second seal is inclined axially relative to the inspection opening.

[0021] This is set to guide the contact between the second seal and the contact part and also to play a role in guiding the flow of liquid.

[0022] Compared with the prior art, an on-line maintenance valve provided by the present invention is provided with a movable part capable of sealing the inspection opening. When performing maintenance, the valve core is rotated so that the valve core can be sealingly connected to the movable part, isolating the valve cavity from the inspection opening. Maintenance personnel can perform maintenance at the inspection opening, while the outlet, valve cavity and inlet remain connected, without affecting the normal operation of the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural cross-section of the on-line maintenance valve provided by the present invention during normal operation Figure 1 ;

[0024] Figure 2 is a structural cross-section of the on-line maintenance valve provided by the present invention during normal operation Figure 2 ;

[0025] Figure 3 is a structural cross-sectional view of the on-line maintenance valve provided by the present invention in the closed state;

[0026] Figure 4 is a structural cross-sectional view of the on-line maintenance valve provided by the present invention in the maintenance state;

[0027] Figure 5 is a structural cross-sectional view of the on-line maintenance valve provided by the present invention after removing the valve cover in the maintenance state;

[0028] Figure 6 is Figure 5 a partial enlarged view of part A in

[0029] Figure 7 is a structural cross-sectional view of the on-line maintenance valve provided by the present invention after removing the first seal assembly in the maintenance state;

[0030] Figure 8 is a schematic structural view of the valve core of the on-line maintenance valve provided by the present invention.

[0031] The meanings represented by the symbols in the figure are as follows:

[0032] 100. Valve for on-line maintenance; 10. Valve body; 11. Inlet; 12. Outlet; 13. Valve cavity; 14. Maintenance opening; 15. Connecting hole; 141. Third sealing groove; 142. Third seal; 20. Valve core; 21. Valve shaft; 22. Contact part; 221. First sealing groove; 222. Step; 223. Reinforcing surface; 224. Connecting part; 2241. Mounting hole; 30. First sealing assembly; 31. First seal; 32. Retaining ring; 40. Movable part; 41. First boss; 42. Second sealing groove; 43. Second seal; 50. Valve cover; 51. Second boss; 52. Drain hole; 53. Control part; 54. Fourth sealing groove; 55. Fourth seal; 60. Adjusting unit; 61. Connecting member; 62. First adjusting member; 63. Second adjusting member. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that when a component is referred to as being "installed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intermediate component at the same time. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or there may be an intermediate component at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0036] Please refer to Figures 1 to 8 , a valve 100 for on-line maintenance provided by the present invention (hereinafter referred to as valve 100 for short), which is used to cut off or connect pipelines in a pipeline system. In this embodiment, the valve 100 is a ball valve. Of course, in other embodiments, the valve 100 can also be a gate valve or a butterfly valve.

[0037] Specifically, the valve 100 includes a valve body 10. Both ends of the valve body 10 are provided with an inlet 11 and an outlet 12. A valve cavity 13 is provided inside the valve body 10. When the valve 100 is in the open state, the valve cavity 13 communicates with the inlet 11 and the outlet 12. In this embodiment, the inlet 11 and the outlet 12 are provided at opposite ends of the valve body 10. In other embodiments, the inlet 11 and the outlet 12 can also be respectively provided on adjacent sides of the valve body 10.

[0038] Further, the valve 100 further includes a valve core 20, a first sealing assembly 30 and a movable member 40. The valve core 20 is located inside the valve cavity 13. The valve core 20 is rotatably installed inside the valve cavity 13. The first sealing assembly 30 is installed on the valve core 20 and can open / seal the inlet 11 or the outlet 12 under the drive of the valve core 20 to realize the pipeline cutoff function of the valve 100. An inspection port 14 communicating with the valve cavity 13 is provided on the valve body 10. The movable member 40 is installed at the inspection port 14 and is hermetically connected to the valve body 10. The valve core 20 can switch and rotate between the inlet 11 / the outlet 12 and the inspection port 14.

[0039] When maintenance is required, the movable member 14 can be in sealing contact with the valve core 20 to isolate the inspection port 14 from the valve cavity 13 and make the first sealing assembly 30 located inside the inspection port 14, so that maintenance personnel can perform maintenance or replacement on the first sealing assembly 30 or other vulnerable parts inside the inspection port 14. During the maintenance process, the inlet 11, the outlet 12 and the valve cavity 13 are in communication, and the pipeline system is still in a normal working state without the need to stop running, which can reduce economic losses. When the valve 100 is working normally, the movable member 40 is disengaged from the sealing with the valve core 20, and the valve cavity 13 communicates with the inspection port 14. It should be noted that the normal operation of the valve 100 refers to the state when the valve 100 does not require maintenance.

[0040] A third sealing groove 141 is provided on the inner side of the inspection port 14. A third sealing member 142 is provided in the third sealing groove 141. The third sealing member 142 abuts against the outer side of the end of the movable member 40 extending into the inspection port 14 to make the movable member 40 hermetically connected to the valve body 10. In this embodiment, the valve core 20 can seal the inlet 11. In other embodiments, according to different designs, the valve core 20 can also seal the outlet 12.

[0041] The valve core 20 includes a valve shaft 21. The installer can rotate the valve shaft 21 to make the valve core 20 rotate to seal the inlet 11 / the outlet 12 or release the seal of the inlet 11 / the outlet 12.

[0042] Please refer to Figures 1 to 4, the valve core 20 includes a contact portion 22. When the valve 100 is in the open state and no maintenance is required, the two ends of the contact portion 22 are respectively spaced from the side walls of the maintenance port 14, so that the maintenance port 14 communicates with the valve cavity 13. When maintenance is required, the contact portion 22 is in sealing contact with the movable member 40, and the contact portion 22 can seal the movable member 40.

[0043] Preferably, the contact portion 22 is provided with a first sealing groove 221 in the circumferential direction. The first sealing assembly 30 includes a first sealing member 31, and the first sealing member 31 is disposed in the first sealing groove 221. When the pipeline system needs to be closed, the valve core 20 is adjusted so that the first sealing member 31 abuts against the side walls of the inlet 11 / outlet 12 to seal the inlet 11 / outlet 12, and the valve 100 is in the closed state.

[0044] Please refer to Figure 7 , a step 222 is provided on the contact portion 22. The first sealing assembly 30 further includes a retaining ring 32, and the retaining ring 32 is detachably fixed to the step 222. The retaining ring 32 partially abuts against the first sealing member 31 to fix the first sealing member 31. When the first sealing member 31 needs to be replaced, the retaining ring 32 is removed, and thus the first sealing member 31 can be removed. In this embodiment, the retaining ring 32 is fixed to the contact portion 22 by bolts, and the first sealing member 31 is a Y-shaped sealing ring. Of course, in other embodiments, the retaining ring 32 can be fixed to the contact portion 22 by other means, and the first sealing member 31 can also be other sealing members with a long strip-shaped cross-section.

[0045] In this embodiment, the first sealing groove 221 is inclined relative to the axial direction of the valve core 20, that is, when the contact portion 22 is located in the maintenance port 14, the first sealing groove 221 is inclined relative to the axial direction of the maintenance port 14. Correspondingly, the first sealing member 31 is inclined relative to the axial direction of the valve core 20. Along the radial direction of the contact portion 22, the outer side of the retaining ring 32 protrudes relative to the step 222, and the protruding portion abuts against the first sealing member 31 to fix the first sealing member 31. In other embodiments, the retaining ring 32 can fix the first sealing member 31 by other means.

[0046] Preferably, please refer to Figure 6 , the first sealing groove 221 is a dovetail groove structure, that is, the notch of the first sealing groove 221 is narrow and the bottom is wide, and there is a gap between the first sealing groove 221 and the first sealing member 31, which can prevent the first sealing member 31 from detaching from the first sealing groove 221. And under the action of pressure, the liquid enters the first sealing groove 221 along the gap, providing pressure to the first sealing member 31, which can enhance the sealing effect of the first sealing member 31. In this embodiment, the first sealing groove 221 is a two-layer dovetail groove. Of course, in other embodiments, one layer or more than three layers of dovetail grooves can also be provided.

[0047] Please refer to Figure 8The contact portion 22 is disc-shaped and extends circumferentially to form a reinforced surface 223. The reinforced surface 223 strengthens the sealing engagement between the contact portion 22 and the movable member 40 and the inlet 11 / outlet 12. The reinforced surface 223 extends symmetrically on both sides to form a connecting portion 224. Connecting holes 15 communicating with the valve cavity 13 are respectively defined on both sides of the valve body 10. A mounting hole 2241 is defined at one end of the connecting portion 224, distal from the reinforced surface 223. The valve shaft 21 is mounted within one of the mounting holes 2241 and sealably passes through the corresponding connecting hole 15. From this connecting hole 15, it extends to the outside of the valve body 10, allowing maintenance personnel to rotate the valve core 20. The valve core 20 is rotatably connected to the outer wall of the valve body 10 via the other mounting hole 2241 and the other connecting hole 15. Maintenance personnel rotate the valve shaft 21 and the valve core 20 from the outside of the valve body 10, causing the contact portion 22 to rotate and switch between the inlet 11 / outlet 12 and the inspection port 14.

[0048] A second sealing groove 42 is circumferentially defined on the inner sidewall of the movable member 40 near the valve core 20. A second sealing member 43 is disposed within the second sealing groove 42. During maintenance, the second sealing member 43 abuts the contact portion 22 to provide a sealed connection between the valve core 20 and the movable member 40. In other embodiments, the second sealing groove 42 may also be defined in the contact portion 22, allowing the second sealing member 43 to be sealed to the movable member 40.

[0049] Please continue to see Figure 6 The inner side of the second sealing member 43 is tilted relative to the axial direction of the inspection port 14, which can correct the sealing contact between the second sealing member 43 and the contact portion 22 and play a role in guiding the flow of the liquid.

[0050] The valve 100 also includes a valve cover 50. Openings are provided at both ends of the movable part 40. The valve cover 50 covers one end of the movable part 40 and seals the opening of the end of the movable part 40 away from the valve core 20. One end of the valve cover 50 is open, and the end with the opening extends into the movable part 40. The outer wall of the valve cover 50 is in contact with the inner wall of the movable part 40 to ensure a sealing connection between the valve cover 50 and the movable part 40.

[0051] Preferably, the valve cover 50 is provided with a drain hole 52, and a control member 53 is provided at the opening of the drain hole 52. During maintenance, the control member 53 is opened to drain the liquid in the inspection port 14 through the drain hole 52, and then the maintenance can be carried out. After the maintenance is completed, the control member 53 is closed to seal the valve body 10. In this embodiment, the control member 53 is a drain valve. During normal operation, the inspection port 14 is connected to the valve cavity 13, and excess liquid in the valve 100 is automatically drained through the drain valve. Of course, in other embodiments, the control member 53 can also be a ball valve or other valve component.

[0052] Further, a fourth sealing groove 54 is provided on the outer side of one end of the valve cover 50 extending into the movable member 40. A fourth sealing member 55 is provided in the fourth sealing groove 54. The fourth sealing member 55 abuts against the inner side of one end of the movable member 40 extending into the inspection opening 14, so that the valve cover 50 is sealingly connected to the movable member 40.

[0053] Specifically, the valve 100 further includes an adjusting unit 60. The adjusting unit 60 is installed at one end of the movable member 40 away from the inspection opening 14. The adjusting unit 60 can drive and adjust the movement of the movable member 40.

[0054] In this embodiment, one end of the movable member 40 extends into the inspection opening 14 and can move along the axial direction of the inspection opening 14. The adjusting unit 60 can adjust the depth of the movable member 40 extending into the inspection opening 14. In other embodiments, the movable member 40 can also laterally seal the inspection opening 14.

[0055] Further, the adjusting unit 60 includes a connecting member 61 and a first adjusting member 62. A first boss 41 is provided radially at one end of the movable member 40 away from the valve cavity 13. The first boss 41 is arranged circumferentially along the movable member 40. The connecting member 61 passes through the first boss 41 and is connected to the valve body 10. The first adjusting member 62 is rotatably connected to the connecting member 61 and can move along the axial direction of the connecting member 61 to drive the movable member 40 to move along the axial direction of the inspection opening 14.

[0056] A second boss 51 is provided radially at one end of the valve cover 50 away from the movable member 40. The second boss 51 is arranged circumferentially along the valve cover 50. The adjusting unit 60 further includes a second adjusting member 63. One end of the connecting member 61 extends out of the first boss 41, passes through the second boss 51, and is connected to the second adjusting member 63 to lock the valve cover 50 to the first boss 41.

[0057] In this embodiment, the connecting member 61 is a bolt, and the first adjusting member 62 and the second adjusting member 63 are nuts. There are three nuts. Two of them are located on both sides of the first boss 41 and are threadedly connected to the bolt. The remaining one nut is located on the side of the second boss 51 away from the first boss 41 and is threadedly connected to the bolt. The nut close to the second boss 51 can abut against the second boss 51 to fix the valve cover 50.

[0058] When maintenance is required, rotate the nuts located on both sides of the first boss 41 to adjust the movable member 40 in the direction close to the valve core 20. After adjustment, tighten the nuts located on both sides of the first boss 41 to lock the movable member 40, and then tighten the nut located on the side of the second boss 51 away from the first boss 41 to fix the valve cover 50. In other embodiments, the number of nuts is not limited to three and can be more than three. In other embodiments, the first adjusting member 62, the second adjusting member 63, and the connecting member 61 can also be other elements that can cooperate for adjustment.

[0059] During the working process, when the valve 100 fails and needs to be repaired, rotate the valve shaft 21 to rotate the contact part 22 to the maintenance port 14. Adjust the first adjusting part 62 to move the movable part 40 towards the valve core 20 so that the movable part 40 abuts against the contact part 22, disconnect the valve cavity 13 from the maintenance port 14. Open the control part 53 to drain the water in the maintenance port 14. Rotate the second adjusting part 63 to open the valve cover 50, remove the retaining ring 32 from the contact part 22, and replace the first sealing part 31 or other vulnerable parts. At this time, the inlet 11, the valve cavity 13 and the outlet 12 are communicated, and the pipeline system is in a normal working state. After the repair is completed, close the valve cover 50, close the control part 53, adjust the first adjusting part 62 to move the movable part 40 away from the contact part 22 so that the valve cavity 13 is communicated with the maintenance port 14, and the valve 100 is repaired.

[0060] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0061] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An on-line maintenance valve, comprising a valve body (10), a valve core (20) and a first sealing assembly (30). An inlet (11) and an outlet (12) are oppositely arranged on the valve body (10). A valve cavity (13) communicating with the inlet (11) and the outlet (12) respectively is provided in the valve body (10). The valve core (20) is rotatably installed in the valve cavity (13). The first sealing assembly (30) is installed on the valve core (20) and can open / close the inlet (11) or the outlet (12) under the drive of the valve core (20). It is characterized in that The on-line maintenance valve further comprises a movable member (40). An inspection opening (14) communicating with the valve cavity (13) is provided on the valve body (10). The movable member (40) is installed at the inspection opening (14) and is hermetically connected to the valve body (10). The valve core (20) can rotate and switch between the inlet (11) or the outlet (12) and the inspection opening (14). During the inspection of the on-line maintenance valve, the movable member (40) can be in sealing contact with the valve core (20) to isolate the valve cavity (13) from the inspection opening (14), and make the first sealing assembly (30) located in the inspection opening (14). During the normal operation of the on-line maintenance valve, the movable member (40) is disengaged from the valve core (20), and the valve cavity (13) communicates with the inspection opening (14). The on-line maintenance valve further comprises a valve cover (50). The valve cover (50) covers the movable member (40) and can seal one end of the movable member (40) away from the inspection opening (14). A connection hole (15) communicating with the valve cavity (13) is provided on the valve body (10). The valve core (20) further comprises a valve shaft (21). The valve shaft (21) is connected to the valve core (20), passes through the connection hole (15), and extends out of the valve body (10) from the connection hole (15).

2. The valve for online maintenance according to claim 1, characterized in that, A water discharge hole (52) is provided on the valve cover (50). The water discharge hole (52) communicates with the inspection opening (14), and a control member (53) is provided at the orifice of the water discharge hole (52).

3. The on-line maintained valve according to claim 1, characterized in that, The on-line maintenance valve further comprises an adjustment unit (60). The adjustment unit (60) is installed at one end of the movable member (40), and the adjustment unit (60) can drive the movable member (40) to move.

4. The valve for online maintenance according to claim 3, wherein One end of the movable member (40) away from the adjustment unit (60) extends into the inspection opening (14) and can move along the axial direction of the inspection opening (14). The adjustment unit (60) can adjust the depth of the movable member (40) extending into the inspection opening (14).

5. The on-line maintained valve according to claim 3, wherein The adjusting unit (60) includes a connecting member (61) and a first adjusting member (62). One end of the movable member (40) away from the valve core (20) is provided with a first boss (41) in the radial direction. One end of the connecting member (61) passes through the first boss (41) and is connected to the valve body (10). The first adjusting member (62) is rotatably connected to the connecting member (61) and can move along the axial direction of the connecting member (61).

6. The on-line maintained valve according to claim 5, wherein One end of the valve cover (50) is provided with a second boss (51) in the radial direction. The adjusting unit (60) further includes a second adjusting member (63). One end of the connecting member (61) extends out from the first boss (41) and passes through the second boss (51), and is connected to the second adjusting member (63) to lock the valve cover (50) to the first boss (41).

7. The on-line maintained valve according to claim 1, characterized in that, The valve core (20) further includes a contact portion (22). The contact portion (22) is provided with a first sealing groove (221) in the circumferential direction. The first sealing assembly (30) includes a first sealing member (31) disposed in the first sealing groove (221). The first sealing member (31) can abut against the side wall of the inlet (11) / the outlet (12). A second sealing groove (42) is provided in the circumferential direction on the inner side wall of the movable member (40) close to the valve core (20). A second sealing member (43) is provided in the second sealing groove (42). The second sealing member (43) contacts the contact portion (22) to form a seal.

8. The valve for online maintenance according to claim 7, wherein The inner side of the second sealing member (43) is inclined axially relative to the inspection port (14).

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