A valve with seals that can be replaced online

Abstract

The present application relates to a valve with an online replaceable seal, which relates to the field of valve design technology, and includes a valve body assembly, which is provided with a mounting through-hole and a flow channel connected thereto; an opening and closing assembly, which extends into the valve body assembly through the mounting through-hole, and the opening and closing assembly includes a valve stem and a valve disc, the valve disc is provided at the end of the valve stem and is located at the cutoff of the flow channel, the valve stem is used to drive the valve disc to move at the cutoff to open and close the flow channel in the valve body assembly, and can drive the valve disc to move into the mounting through-hole to seal the mounting through-hole; a seal, which is provided in the mounting through-hole and sleeved on the valve stem. Since the valve stem can drive the valve disc to move into the mounting through-hole to seal the mounting through-hole, when replacing the seal, the valve disc can be moved into the mounting through-hole to seal the mounting through-hole. At this time, the seal does not need to function, and the valve disc can complete the sealing function. The seal can be replaced while the flow channel remains in use, which is convenient to use and highly safe.

Description

Technical Field

[0001] The present invention relates to the technical field of valve design, and in particular to a valve with a sealing element capable of being replaced online. Background Art

[0002] Valves have high safety requirements, not only in terms of their materials but also in terms of zero leakage during operation to avoid safety risks. The service life of existing valves depends not only on their structural design and materials, but also on the actual operating conditions.

[0003] The valve's overall structure presents two leakage risks. First, the connection between the valve cover and the valve body cannot be completely sealed. Therefore, existing valves often use welding to seal the perimeter of the gap between the fixed valve cover and the valve body to prevent leakage. Second, the gap around the valve stem poses a leakage risk. While the sealing packing can prevent leakage, the relative movement between the valve stem and the packing during valve opening and closing can cause the packing to wear after a certain number of openings and closings, leading to leakage. Therefore, to ensure the safe operation of nuclear power plants, valve seals require regular inspection and maintenance to ensure they are always in good and safe working condition.

[0004] In the prior art, due to the influence of the valve working environment and safety requirements, when the valve is regularly maintained or leaks occur, the pipeline needs to be closed and the valve components need to be disassembled to replace the packing.

[0005] However, the process of closing the pipeline and disassembling the valve components to replace the packing is complicated and time-consuming, has operational difficulties, and may cause safety hazards during the operation. Summary of the Invention

[0006] The present application provides a valve with replaceable seals online, which can solve the problems in the prior art of closing the pipeline, disassembling the valve components to replace the packing, which is complicated and time-consuming, has operational difficulties, and may cause safety hazards during operation.

[0007] In a first aspect, an embodiment of the present application provides a valve with an online replaceable seal, comprising:

[0008] A valve body assembly having a mounting through hole and a flow channel communicating therewith;

[0009] an opening and closing assembly extending through the mounting through-hole into the valve body assembly, the opening and closing assembly comprising a valve stem and a valve flap, the valve flap being disposed at an end of the valve stem and located at a cutoff portion of the flow passage, the valve stem being configured to drive the valve flap to move at the cutoff portion to open and close the flow passage in the valve body assembly, and to drive the valve flap to move into the mounting through-hole to seal the mounting through-hole;

[0010] A sealing member is arranged in the mounting through hole and sleeved on the valve stem.

[0011] In one embodiment, a cylindrical recess is provided at the end of the valve stem, and a connecting platform is provided on the side of the valve disc close to the valve stem. The connecting platform partially extends into the cylindrical recess and is detachably connected to the cylindrical recess. When the seal is replaced, the opening and closing assembly is moved along the axial direction of the mounting through hole, and the connecting platform abuts against the open end of the cylindrical recess.

[0012] In one embodiment, the open end of the cylindrical recess is provided with an internal thread section, and the end portion of the connecting platform extending into the cylindrical recess is provided with an external thread section matching the internal thread section. When replacing the seal, the opening and closing assembly is moved along the axial direction of the mounting through hole, and the connecting platform abuts against the internal thread section of the cylindrical recess.

[0013] In one embodiment, the surface of one end of the connecting platform extending into the cylindrical recess is a spherical surface.

[0014] In one embodiment, the mounting through hole is a stepped hole, the large diameter section of the mounting through hole is connected to the flow channel, the sealing component is provided in the small diameter section of the mounting through hole, and the large diameter section of the mounting through hole matches the valve flap.

[0015] In one embodiment, the valve body assembly comprises:

[0016] The valve body has a stepped mounting hole on one side, and an end of the stepped mounting hole close to the flow channel is provided with a large diameter section of the mounting through hole;

[0017] The valve cover is inserted into the stepped mounting hole. The valve cover is provided with a small-diameter section of the mounting through hole. When replacing the seal, the opening and closing assembly is moved along the axial direction of the mounting through hole, and the valve disc abuts against the valve cover to seal the mounting through hole.

[0018] In one embodiment, a boss is provided at the lower end of the valve cover, and a sealing gasket is provided on a side of the valve flap close to the valve cover, and the sealing gasket is arranged corresponding to the boss.

[0019] In one embodiment, a packing base is provided in the valve cover, a packing gland is provided at the upper end of the valve cover, and the packing base, the packing gland and the valve stem form an annular accommodating cavity, and the annular accommodating cavity is used to place the sealing member.

[0020] In one embodiment, a compression nut is further included. The upper end of the valve cover is provided with an external thread. The compression nut is arranged on the outside of the packing gland and is used to cooperate with the external thread to compress the packing gland.

[0021] In one embodiment, the flow channel includes a first transverse flow channel, a longitudinal flow channel, and a second transverse flow channel connected in sequence. The direction of the longitudinal flow channel is the same as the opening and closing movement direction of the valve flap, and the valve flap is used to be arranged at the outflow end of the longitudinal flow channel.

[0022] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0023] When manufacturing a valve with an online replaceable seal, a mounting through-hole and a flow channel connected thereto are provided within the valve body assembly. An opening and closing assembly extends into the valve body assembly through the mounting through-hole. The opening and closing assembly includes a valve stem and a valve disc. The valve disc is disposed at the end of the valve stem and located at the cutoff of the flow channel. The valve stem is used to drive the valve disc to move at the cutoff to open and close the flow channel within the valve body assembly and can drive the valve disc to move into the mounting through-hole to seal the mounting through-hole. The seal is disposed within the mounting through-hole and sleeved on the valve stem. Since the valve stem can drive the valve disc to move into the mounting through-hole to seal the mounting through-hole, when replacing the seal, the valve disc can be moved into the mounting through-hole to seal the mounting through-hole. In this case, the valve disc does not need to function and the sealing function can be completed. The seal can be replaced while the flow channel remains in use. This is convenient to use and highly safe. It solves the problem in the prior art that the process of closing the pipeline and disassembling the valve components to replace the packing is complicated and time-consuming, has operational difficulties, and may create safety hazards during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 This is a structural schematic diagram of a valve embodiment of the present invention with an online replaceable seal in a flow channel closed state.

[0026] Figure 2 This is a structural schematic diagram of a valve embodiment of the present invention with an online replaceable seal in a fully open flow channel state.

[0027] Figure 3 This is a schematic structural diagram of the connection between the valve stem and the valve disc when the flow channel is closed in an embodiment of a valve with an online replaceable seal according to the present invention.

[0028] Figure 4 This is a structural schematic diagram of the connection between the valve stem and the valve disc when the flow channel is fully open in an embodiment of a valve with an online replaceable seal of the present invention.

[0029] In the figure: 1. Valve body assembly; 11. Valve body; 12. Valve cover; 121. Boss; 122. Packing base; 2. Opening and closing assembly; 21. Valve stem; 211. Cylindrical recess; 22. Valve disc; 221. Connecting platform; 2211. Spherical surface; 3. Seal; 4. Sealing gasket; 5. Packing gland; 6. Locking nut; 7. Handwheel. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] An embodiment of the present application provides a valve with replaceable seals online, which can solve the problem in the prior art that the process of closing the pipeline and disassembling the valve components to replace the packing is complicated and time-consuming, has operational difficulties, and may cause safety hazards during operation.

[0032] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the present application provides a valve with an online replaceable seal, which includes:

[0033] The valve body assembly 1 is provided with a mounting through hole and a flow channel communicating therewith;

[0034] The opening and closing assembly 2 extends through the mounting hole into the valve body assembly 1. The opening and closing assembly 2 includes a valve stem 21 and a valve disc 22. The valve disc 22 is provided at the end of the valve stem 21 and is located at the truncation of the flow channel. The valve stem 21 is used to drive the valve disc 22 to move at the truncation to open and close the flow channel in the valve body assembly 1, and can also drive the valve disc 22 to move into the mounting hole to seal the mounting hole.

[0035] The sealing member 3 is arranged in the mounting through hole and sleeved on the valve stem 21 .

[0036] When manufacturing the valve with online replaceable seals, a mounting through hole and a flow channel connected thereto are provided in the valve body assembly 1. The opening and closing assembly 2 extends into the valve body assembly 1 through the mounting through hole. The opening and closing assembly 2 includes a valve stem 21 and a valve flap 22. The valve flap 22 is arranged at the end of the valve stem 21 and is located at the cutoff of the flow channel. The valve stem 21 is used to drive the valve flap 22 to move at the cutoff to open and close the flow channel in the valve body assembly 1, and can drive the valve flap 22 to move into the mounting through hole to seal the mounting through hole. The seal 3 is arranged in the mounting through hole and is sleeved on the valve stem 21. Since the valve stem 21 can drive the valve flap 22 to move into the installation through hole to seal the installation through hole, when replacing the seal 3, the valve flap 22 can be moved into the installation through hole to seal the installation through hole. At this time, there is no need for the seal 3 to play a role, and the valve flap 22 can complete the sealing function. The seal 3 can be replaced while the flow channel remains in use. It is easy to use and has high safety. It solves the problem in the prior art that the process of closing the pipeline and disassembling the valve components to replace the packing is complicated and time-consuming, there are operational difficulties, and safety hazards may arise during operation.

[0037] In this example, a hand wheel 7 is provided at the upper end of the valve stem 21 to facilitate movement of the valve stem 21 .

[0038] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, in some optional embodiments, a cylindrical recess 211 is provided at the end of the valve stem 21, and a connecting platform 221 is provided on the side of the valve disc 22 close to the valve stem 21. The connecting platform 221 partially extends into the cylindrical recess 211 and is detachably connected to the cylindrical recess 211. When replacing the seal 3, the opening and closing assembly 2 is moved along the axial direction of the mounting through hole, and the connecting platform 221 abuts against the open end of the cylindrical recess 211.

[0039] In this embodiment, a cylindrical recess 211 is provided at the end of the valve stem 21, and a connecting platform 221 is provided on the side of the valve disc 22 close to the valve stem 21. The connecting platform 221 partially extends into the cylindrical recess 211 and is detachably connected to the cylindrical recess 211. When replacing the seal 3, the opening and closing assembly 2 is moved along the axial direction of the mounting hole, and the connecting platform 221 abuts against the open end of the cylindrical recess 211. The valve stem 21 drives the valve disc 22 to move. When the valve disc 22 moves into the mounting hole and seals the mounting hole, the valve stem 21 is separated from the valve disc 22 to facilitate the replacement of the seal 3, which is more convenient to operate.

[0040] like Figure 3 and Figure 4As shown, in some optional embodiments, the open end of the cylindrical recess 211 is provided with an internal thread section, and the end portion of the connecting platform 221 extending into the cylindrical recess 211 is provided with an external thread section matching the internal thread section. When replacing the seal 3, the opening and closing assembly 2 is moved along the axial direction of the mounting through hole, and the connecting platform 221 abuts against the internal thread section of the cylindrical recess 211.

[0041] In this embodiment, an internal thread section is provided at the open end of the cylindrical recess 211, and the end portion of the connecting platform 221 extending into the cylindrical recess 211 is provided with an external thread section matching the internal thread section. When replacing the seal 3, the opening and closing component 2 is moved along the axial direction of the mounting hole, and the connecting platform 221 abuts against the internal thread section of the cylindrical recess 211. The valve stem 21 drives the valve disc 22 to move. When the valve disc 22 moves into the mounting hole and seals the mounting hole, the valve disc 22 is hindered by the wall of the mounting hole. The valve stem 21 is rotated to separate the valve disc 22, which facilitates the replacement of the seal 3 and is more convenient to operate. Since a space is left at the connection between the valve disc 22 and the valve stem 21 in the online replacement state, the valve disc 22 can continue to move a certain distance when pressure is applied by the medium in the flow channel, thereby playing a self-tightening role and ensuring the safety of the seal.

[0042] like Figure 3 and Figure 4 As shown, in some optional embodiments, the surface of one end of the connecting platform 221 extending into the cylindrical recessed platform 211 is a spherical surface 2211 .

[0043] In this embodiment, the surface of one end of the connecting platform 221 extending into the cylindrical recess 211 is a spherical surface 2211. The spherical surface 2211 can contact the inner plane of the cylindrical recess 211, so that the flow channel is in a closed state. The valve stem 21 can apply an adjustable force to the valve flap 22, so that the sealing force at the surfacing joint between the valve flap 22 and the valve body assembly 1 is uniform, and the surfacing structure is not easily crushed.

[0044] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, in some optional embodiments, the mounting through hole is a stepped hole, the large diameter section of the mounting through hole is connected to the flow channel, a seal 3 is provided in the small diameter section of the mounting through hole, and the large diameter section of the mounting through hole matches the valve flap 22.

[0045] In this embodiment, the mounting through hole is a stepped hole, the large diameter section of the mounting through hole is connected to the flow channel, and a seal 3 is provided in the small diameter section of the mounting through hole. The large diameter section of the mounting through hole matches the valve flap 22, and the valve flap 22 moves to the large diameter section of the mounting through hole to seal the small diameter section of the mounting through hole, thereby achieving a better sealing effect.

[0046] like Figure 1 and Figure 2 As shown, in some optional embodiments, the valve body assembly 1 includes:

[0047] The valve body 11 has a stepped mounting hole on one side, and a large diameter section of the mounting through hole is provided at one end of the stepped mounting hole close to the flow channel;

[0048] The valve cover 12 is inserted into the stepped mounting hole. A small-diameter section of the mounting through hole is provided in the valve cover 12. When replacing the seal 3, the opening and closing assembly 2 is moved along the axial direction of the mounting through hole, and the valve disc 22 abuts against the valve cover 12 to seal the mounting through hole.

[0049] In this embodiment, the structure of the valve body assembly 1 is specifically described. The valve body assembly 1 includes a valve body 11 and a valve cover 12, wherein a stepped mounting hole is provided on one side of the valve body 11, and a large-diameter section of the mounting through hole is provided at one end of the stepped mounting hole close to the flow channel. The valve cover 12 is inserted into the stepped mounting hole, and a small-diameter section of the mounting through hole is provided in the valve cover 12. When the seal 3 is replaced, the opening and closing assembly 2 is moved along the axial direction of the mounting through hole, and the valve disc 22 abuts against the valve cover 12 to seal the mounting through hole. The structure is simple and easy to manufacture.

[0050] In this example, a metal spiral wound gasket is provided between the valve cover 12 and the valve body 11 for sealing, and the outer edges where the two are in contact are welded and sealed. The stepped mounting hole can ensure the connection effect between the valve body 11 and the valve cover 12.

[0051] like Figure 3 and Figure 4 As shown, in some optional embodiments, a boss 121 is provided at the lower end of the valve cover 12 , and a sealing gasket 4 is provided on the side of the valve flap 22 close to the valve cover 12 , and the sealing gasket 4 is arranged corresponding to the boss 121 .

[0052] In this embodiment, a boss 121 is provided at the lower end of the valve cover 12, and a sealing gasket 4 is provided on the side of the valve flap 22 close to the valve cover 12. The sealing gasket 4 is arranged corresponding to the boss 121 to improve the sealing effect of the valve flap 22 on the installation through hole.

[0053] In this example, sealing gasket 4 is made of ceramic fiber, which can withstand temperatures up to 320°C, meeting the requirements of the working environment. To prevent the sealing gasket 4 from falling off, an embedded design is adopted. This not only greatly reduces the required sealing force but also ensures that the sealing gasket 4 remains fixed in place during the valve's life cycle.

[0054] like Figure 1 and Figure 2 As shown, in some optional embodiments, a packing base 122 is provided in the valve cover 12, and a packing gland 5 is provided at the upper end of the valve cover 12. The packing base 122, the packing gland 5 and the valve stem 21 form an annular accommodating cavity for placing the seal 3.

[0055] In this embodiment, a packing base 122 is provided in the valve cover 12, and a packing gland 5 is provided at the upper end of the valve cover 12. The packing base 122, the packing gland 5 and the valve stem 21 form an annular accommodating cavity, which is used to place the seal 3. The structure is simple and easy to manufacture.

[0056] like Figure 1 and Figure 2 As shown, in some optional embodiments, a clamping nut 6 is further included. The upper end of the valve cover 12 is provided with an external thread. The clamping nut 6 is arranged on the outside of the packing gland 5 to cooperate with the external thread to clamp the packing gland 5.

[0057] In this embodiment, the valve with online replaceable seals also includes a clamping nut 6. The upper end of the valve cover 12 is provided with an external thread. The clamping nut 6 is arranged on the outside of the packing gland 5 and is used to cooperate with the external thread to compress the packing gland 5, thereby facilitating the fixing of the packing gland 5 and making the installation state of the seal 3 more stable.

[0058] like Figure 1 and Figure 2 As shown, in some optional embodiments, the flow channel includes a first transverse flow channel, a longitudinal flow channel, and a second transverse flow channel connected in sequence. The direction of the longitudinal flow channel is the same as the opening and closing movement direction of the valve flap 22, and the valve flap 22 is used to be set at the outflow end of the longitudinal flow channel.

[0059] In this embodiment, the flow channel includes a first transverse flow channel, a longitudinal flow channel and a second transverse flow channel that are connected in sequence. The direction of the longitudinal flow channel is the same as the opening and closing movement direction of the valve flap 22. The valve flap 22 is used to be set at the outflow end of the longitudinal flow channel to facilitate cutting off the flow channel. There is no need to design the valve flap 22 too large, which reduces the weight and ensures that the medium in the flow channel can provide pressure to support the valve flap 22.

[0060] In this example, a sealing structure is provided at the outflow end of the longitudinal flow channel, which cooperates with the lower side of the valve disc 22 to ensure the effect of cutting off the flow channel and improve the operating stability of the valve with online replaceable seals.

[0061] To sum up, when manufacturing the valve with online replaceable seals, a mounting through hole and a flow channel connected thereto are provided in the valve body assembly 1. The opening and closing assembly 2 extends into the valve body assembly 1 through the mounting through hole. The opening and closing assembly 2 includes a valve stem 21 and a valve flap 22. The valve flap 22 is arranged at the end of the valve stem 21 and is located at the cutoff of the flow channel. The valve stem 21 is used to drive the valve flap 22 to move at the cutoff to open and close the flow channel in the valve body assembly 1, and can drive the valve flap 22 to move into the mounting through hole to seal the mounting through hole. The seal 3 is arranged in the mounting through hole and is sleeved on the valve stem 21. Since the valve stem 21 can drive the valve flap 22 to move into the installation through hole to seal the installation through hole, when replacing the seal 3, the valve flap 22 can be moved into the installation through hole to seal the installation through hole. At this time, there is no need for the seal 3 to play a role, and the valve flap 22 can complete the sealing function. The seal 3 can be replaced while the flow channel remains in use. It is easy to use and has high safety. It solves the problem in the prior art that the process of closing the pipeline and disassembling the valve components to replace the packing is complicated and time-consuming, there are operational difficulties, and safety hazards may arise during operation.

[0062] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0063] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0064] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A valve with an online replaceable seal, characterized in that: include: A valve body assembly (1) having a mounting through hole and a flow channel communicating therewith; an opening and closing assembly (2) extending through the mounting through hole into the valve body assembly (1), the opening and closing assembly (2) comprising a valve stem (21) and a valve flap (22), the valve flap (22) being arranged at the end of the valve stem (21) and located at the cutoff portion of the flow channel, the valve stem (21) being used to drive the valve flap (22) to move at the cutoff portion to open and close the flow channel in the valve body assembly (1), and to drive the valve flap (22) to move into the mounting through hole to seal the mounting through hole; A sealing member (3) is disposed in the mounting through hole and sleeved on the valve stem (21); A cylindrical recess (211) is provided at the end of the valve stem (21), and a connecting platform (221) is provided on a side of the valve flap (22) close to the valve stem (21). The connecting platform (221) partially extends into the cylindrical recess (211) and is detachably connected to the cylindrical recess (211). When the sealing member (3) is replaced, the opening and closing assembly (2) is moved along the axial direction of the mounting through hole, and the connecting platform (221) abuts against the open end of the cylindrical recess (211). The open end of the cylindrical recess (211) is provided with an internal thread section, and the end portion of the connecting platform (221) extending into the cylindrical recess (211) is provided with an external thread section matching the internal thread section. When the sealing member (3) is replaced, the opening and closing assembly (2) is moved along the axial direction of the mounting through hole, and the connecting platform (221) abuts against the internal thread section of the cylindrical recess (211).

2. A valve with an online replaceable seal according to claim 1, characterized in that: The surface of one end of the connecting platform (221) extending into the cylindrical recessed platform (211) is a spherical surface (2211).

3. A valve with an online replaceable seal according to claim 1, characterized in that: The mounting through hole is a stepped hole, the large diameter section of the mounting through hole is connected to the flow channel, the sealing member (3) is provided in the small diameter section of the mounting through hole, and the large diameter section of the mounting through hole matches the valve flap (22).

4. A valve with an online replaceable seal according to claim 3, characterized in that: The valve body assembly (1) comprises: A valve body (11) is provided with a stepped mounting hole on one side thereof, and an end of the stepped mounting hole close to the flow channel is provided with a large diameter section of the mounting through hole; A valve cover (12) is inserted into the stepped mounting hole, and a small-diameter section of the mounting through hole is provided in the valve cover (12). When the sealing member (3) is replaced, the opening and closing assembly (2) is moved along the axial direction of the mounting through hole, and the valve flap (22) abuts against the valve cover (12) to seal the mounting through hole.

5. A valve with an online replaceable seal according to claim 4, characterized in that: A boss (121) is provided at the lower end of the valve cover (12), and a sealing gasket (4) is provided on a side of the valve flap (22) close to the valve cover (12), wherein the sealing gasket (4) is arranged corresponding to the boss (121).

6. A valve with an online replaceable seal according to claim 4, characterized in that: A packing base (122) is provided in the valve cover (12), and a packing gland (5) is provided at the upper end of the valve cover (12). The packing base (122), the packing gland (5) and the valve stem (21) form an annular accommodating cavity, and the annular accommodating cavity is used to accommodate the sealing member (3).

7. A valve with an online replaceable seal according to claim 6, characterized in that: It also includes a clamping nut (6). The upper end of the valve cover (12) is provided with an external thread. The clamping nut (6) is arranged on the outside of the packing gland (5) and is used to cooperate with the external thread to clamp the packing gland (5).

8. The valve with online replaceable seal according to claim 1, characterized in that: The flow channel comprises a first transverse flow channel, a longitudinal flow channel and a second transverse flow channel which are connected in sequence. The direction of the longitudinal flow channel is the same as the opening and closing movement direction of the valve flap (22). The valve flap (22) is used to be arranged at the outflow end of the longitudinal flow channel.

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