Valve capable of replacing sealing element on line

Abstract

The invention relates to a valve capable of replacing a sealing element on line, and relates to the technical field of valve design, the valve comprises a valve body assembly, and a mounting through hole and a flow channel communicated with the mounting through hole are formed in the valve body assembly; the opening and closing assembly penetrates through the mounting through hole and extends into the valve body assembly, the opening and closing assembly comprises a valve rod and a valve clack, the valve clack is arranged at the end of the valve rod and located at the cut-off position of the flow channel, and the valve rod is used for driving the valve clack to move at the cut-off position so as to open and close the flow channel in the valve body assembly and can drive the valve clack to move into the mounting through hole so as to seal the mounting through hole; the sealing piece is arranged in the mounting through hole and arranged on the valve rod in a sleeving mode. Due to the fact that the valve rod can drive the valve clack to move into the installation through hole to seal the installation through hole, when the sealing piece is replaced, the valve clack can be moved into the installation through hole to seal the installation through hole, at the moment, the sealing piece does not need to play a role, the valve clack can achieve the sealing effect, the sealing piece can be replaced when the flow channel is kept in the use state, use is convenient, and safety is high.

Description

Technical Field

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

[0002] Valves have high safety requirements. Not only do they have certain requirements for their own materials, but they must also ensure "zero leakage" during operation to avoid safety risks. The service life of existing valves depends not only on their structural design and the materials used, but also on the actual use conditions.

[0003] There are two leakage risks in the overall structure of the valve. First, the connection between the valve cover and the valve body cannot be completely sealed. Therefore, existing valves mostly use welding methods to weld the outer periphery of the gap between the fixed valve cover and the valve body to prevent leakage. Second, there is a gap around the valve stem, which poses a risk of leakage. Although the sealing packing can prevent leakage, due to the relative movement between the valve stem and the packing during the opening and closing of the valve, the packing will wear after a certain number of openings and closings, thus leaking. Therefore, in order to ensure the safe operation of nuclear power plants, valve seals need to be inspected and maintained according to the prescribed cycle to ensure that they are always in good and safe working condition.

[0004] In the prior art, due to the influence of the working environment of the valve and the safety requirements, when the valve is regularly repaired or leaks, it is necessary to close the pipeline and disassemble the valve components 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, which is troublesome to operate 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 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 troublesome operation, and may cause safety hazards during operation.

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

[0008] A valve body assembly, wherein a mounting through hole and a flow channel communicating with the valve body are provided therein;

[0009] an opening and closing assembly, which extends into the valve body assembly through the installation through hole, the opening and closing assembly comprising a valve stem and a valve flap, the valve flap being arranged at the end of the valve stem and located at the cut-off portion of the flow channel, the valve stem being used to drive the valve flap to move at the cut-off portion to open and close the flow channel in the valve body assembly, and being able to drive the valve flap to move into the installation through hole to seal the installation through hole;

[0010] A sealing member is arranged in the installation 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 partial end of the connecting platform extending into the cylindrical recess is provided with an external thread section matching the internal thread section. 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 internal thread section of the cylindrical recess.

[0013] In one embodiment, the surface of one end of the connecting platform extending into the cylindrical recessed platform 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 arranged 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] A valve body, one side of which is provided with a stepped mounting hole, 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, and a small diameter section of the mounting through hole is arranged in the valve cover. When the sealing member is replaced, the opening and closing assembly is moved along the axial direction of the mounting through hole, and the valve flap 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, 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 clamping nut is further included. The upper end of the valve cover is provided with an external thread. The clamping nut is arranged on the outer side of the packing gland and is used to cooperate with the external thread to clamp 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 brought by the technical solution provided in the embodiments of the present application include:

[0023] When manufacturing the valve with online replaceable seal, a mounting through hole and a flow channel connected thereto are provided in the valve body assembly, the 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 flap, the valve flap is arranged at the end of the valve stem and is located at the cut-off of the flow channel, the valve stem is used to drive the valve flap to move at the cut-off to open and close the flow channel in the valve body assembly, and can drive the valve flap to move into the mounting through hole to seal the mounting through hole, the seal is arranged in the mounting through hole and sleeved on the valve stem. Since the valve stem can drive the valve flap to move into the mounting through hole to seal the mounting through hole, when replacing the seal, the valve flap can be moved into the mounting through hole to seal the mounting through hole, at this time, the seal does not need to play a role, the valve flap can complete the sealing role, and the seal can be replaced while the flow channel remains in use, which is convenient to use and highly safe, and solves the problem in the prior art that the process of closing the pipeline and disassembling the valve components for packing replacement is complicated and time-consuming, there is troublesome operation, and there may be 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 drawings required for use in the description of the embodiments will be briefly introduced below. 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 creative work.

[0025] Figure 1 It is a structural schematic diagram of a valve embodiment of the present invention in which a sealing element can be replaced online and the flow channel is closed.

[0026] Figure 2 It is a structural schematic diagram of a valve embodiment of the present invention with a seal that can be replaced online, in a state where the flow channel is fully opened.

[0027] Figure 3 It 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 online replaceable sealing elements of the present invention.

[0028] Figure 4 It is a schematic structural diagram of the connection between the valve stem and the valve disc when the flow channel is in a fully open state in an embodiment of a valve with online replaceable sealing elements 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. sealing element; 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 solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] The 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 troublesome operation, 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 a seal that can be replaced online, which includes:

[0033] A valve body assembly 1, wherein a mounting through hole and a flow channel communicating therewith are provided therein;

[0034] The opening and closing assembly 2 extends into the valve body assembly 1 through the installation 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 installation through hole to seal the installation through hole.

[0035] The sealing member 3 is arranged in the installation 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, the seal 3 is not needed 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 for packing replacement is complicated and time-consuming, there are operating difficulties, and safety hazards may occur during operation.

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

[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 partial end 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 an external thread section matching the internal thread section is provided at the partial end of the connecting platform 221 extending into 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 internal thread section of the cylindrical recess 211. The valve stem 21 drives the valve flap 22 to move. When the valve flap 22 moves into the mounting hole and seals the mounting hole, the valve flap 22 is hindered by the wall of the mounting hole. The valve stem 21 is rotated to separate the valve flap 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 flap 22 and the valve stem 21 in the online replacement state, the valve flap 22 can continue to move a 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, and the spherical surface 2211 can contact the inner plane of the cylindrical recess 211, so that the flow channel is in a closed state, and the valve stem 21 can apply an adjustable force to the valve flap 22, so that the valve flap 22 and the sealing force at the surfacing joint in the valve body assembly 1 are 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 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 .

[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, a sealing member 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 a 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 a 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 flap 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 a 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 a 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 flap 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 of the contact between the two are welded and fixed 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, the sealing gasket 4 is made of ceramic fiber gasket, which can withstand a maximum temperature of 320°C and meet the requirements of the working environment. In order to prevent the sealing gasket 4 from falling off, an embedded design is adopted, which not only greatly reduces the required sealing force, but also ensures that the sealing gasket 4 can remain in a fixed position and does not fall off during the valve 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, and the annular accommodating cavity is used to place 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 seal 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, 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 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 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 flap 22 to ensure the effect of cutting off the flow channel and improve the use stability of the valve with online replaceable seals.

[0061] To summarize, 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, and 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, and 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, the seal 3 is not needed 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 for packing replacement is complicated and time-consuming, there are operating difficulties, and safety hazards may occur during operation.

[0062] In the description of the present application, it should be noted that the terms "upper", "lower", etc. 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 the present application and simplifying the description, rather than indicating or implying 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 the present 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present 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 only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such 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 including 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0064] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A valve with a seal that can be replaced online, characterized in that: include: A valve body assembly (1) is provided with a mounting through hole and a flow channel communicating therewith; an opening and closing assembly (2) which passes through the installation through hole and extends into the valve body assembly (1); the opening and closing assembly (2) comprises 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 cut-off point of the flow channel; the valve stem (21) is used to drive the valve flap (22) to move at the cut-off point to open and close the flow channel in the valve body assembly (1), and can drive the valve flap (22) to move into the installation through hole to seal the installation through hole; A sealing member (3) is arranged in the installation through hole and sleeved on the valve stem (21).

2. A valve with an online replaceable seal as claimed in claim 1, characterized in that: 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 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 component (3) is replaced, the opening and closing component (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).

3. A valve with an online replaceable seal as claimed in claim 2, characterized in that: 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).

4. A valve with an online replaceable seal as claimed in claim 3, 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).

5. A valve with an online replaceable seal as claimed in 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 arranged 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).

6. A valve with an online replaceable seal as claimed in claim 5, characterized in that: The valve body assembly (1) comprises: A valve body (11) is provided with 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; A 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 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.

7. A valve with an online replaceable seal as claimed in claim 6, 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).

8. A valve with an online replaceable seal as claimed in claim 6, characterized in that: A packing base (122) is provided inside 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 element (3).

9. A valve with an online replaceable seal as claimed in claim 8, 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 outer side of the packing gland (5) and is used to cooperate with the external thread to clamp the packing gland (5).

10. A valve with an online replaceable seal as claimed in 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), and the valve flap (22) is used to be arranged at the outflow end of the longitudinal flow channel.

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