Bidirectional sealing butterfly valve

Abstract

The utility model relates to a two-way sealing butterfly valve which comprises a valve body, a valve rod is arranged on the valve body in a rotating mode, a valve plate is arranged on the valve rod, and a flow channel sealing ring is arranged on the valve plate. The valve seat assembly comprises a floating valve seat, a movable gap is formed between the floating valve seat and the valve body, and the matching surface of the floating valve seat and the runner sealing ring is an inclined surface; and the O-shaped sealing ring is used for sealing the floating valve seat and the valve body. During use, the O-shaped sealing ring is firstly placed in the first groove, then the floating valve seat, the first limiting component and the second limiting component are sequentially installed in the valve body, the locking component is tightened through torque, and the O-shaped sealing ring is extruded. By the adoption of the technical scheme, the valve seat assembly and the valve body are easy and convenient to install, media are effectively prevented from leaking from the movable gap, meanwhile, the floating valve seat can extrude the O-shaped sealing ring to slightly move in the direction of reverse medium pressure under the action of the reverse medium pressure, and the sealing effect of the valve seat assembly and the valve body is improved. The sealing performance between the floating valve seat and the flow channel sealing ring is improved, and therefore bidirectional sealing is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a bidirectional sealing butterfly valve. Background Art

[0002] In addition to meeting the conventional forward sealing requirements, low-temperature butterfly valves also need to meet the reverse sealing requirements. For butterfly valves with a three-eccentric structure, the actuator provides torque on the valve stem to rotate the valve plate 90° clockwise from the fully open position, and the sealing ring fixed on the valve plate is squeezed into contact with the valve seat fixed on the valve body to achieve sealing. Due to the radial eccentricity (the center of rotation of the valve plate deviates from the center line of the flow channel), the area of ​​the upper half of the valve plate is larger than the area of ​​the lower half of the valve plate. Therefore, the effect of the forward medium acting on the valve plate is to make the valve plate produce a clockwise torque, which is the same as the closing direction of the valve. The greater the pressure of the forward medium, the greater the closing torque generated on the valve plate, the more the sealing ring tends to be closed, the greater the extrusion force between the sealing ring and the valve seat, and the better the sealing performance. Its reverse sealing performance is just the opposite. The reverse medium force causes the sealing ring to tend to leave the valve seat, and the sealing pressure ratio between the sealing ring and the valve seat is reduced, which is not conducive to reverse high-pressure sealing.

[0003] The valve seat of the cryogenic butterfly valve is fixed to the valve body by screws, the sealing ring is fixed to the valve plate by a pressure ring and screws, the valve plate and the valve stem are fixedly connected by a cylindrical pin, and the actuator installed on the bracket provides rotational power, which drives the valve stem, the valve plate fixed on the valve stem, and the sealing ring fixed on the valve plate to rotate in turn. When the valve plate rotates 90° from the fully open position, the sealing surface of the sealing ring fits the sealing surface of the valve seat. At this time, the actuator continues to provide torque, so that a large extrusion force is generated between the sealing ring and the sealing surface of the valve seat. When the extrusion force reaches the required sealing specific pressure of the material, sealing can be achieved. The sealing surface of the triple eccentric structure valve seat and the sealing ring is a slope structure.

[0004] In order to achieve reverse sealing, conventional three-eccentric butterfly valves need to improve the configuration of the actuator, and overcome the tendency of the valve seat and the sealing ring to separate when the reverse medium acts by increasing the closing torque, so that they can achieve close contact and seal. However, the increase in the configuration of the actuator not only increases the product cost, but also makes the valve stem bear greater torsional force, and the risk of deformation and fracture also increases. And when the reverse medium pressure is high, the output torque of the actuator cannot compensate for the torque of the medium acting on the valve plate to open the valve plate. Therefore, the reverse sealing performance of the conventional three-eccentric butterfly valve is poor under high-pressure conditions.

[0005] At present, the existing technology provides a pre-tightening force for the valve seat by setting a spring between the valve body and the valve seat, ensures the initial position of the floating valve seat, and enables an adjustment gap to exist between the valve seat and the valve body. The valve seat can move along the flow direction. When the valve is subjected to the action of reverse medium, the floating valve seat compresses the spring through the pressure of the medium itself, and moves slightly toward the sealing ring, thereby increasing the contact pressure between the valve seat and the valve plate sealing ring and achieving better sealing. The sealing between the valve seat and the inner cavity of the valve body requires the setting of two sealing parts to achieve sealing. However, the existing two-way sealing structure of the three-eccentric butterfly valve has the problems of relatively complex structure, cumbersome assembly process and greater assembly difficulty. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a bidirectional sealing butterfly valve for solving the problems of the existing three-eccentric butterfly valve bidirectional sealing structure having a relatively complex structure, cumbersome assembly process and greater assembly difficulty.

[0007] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a two-way sealing butterfly valve, comprising:

[0008] A valve body is provided with a medium flow channel, a valve stem is rotatably provided on the valve body, a valve plate is provided on the valve stem, a flow channel sealing ring is provided on the valve plate, the valve plate is located in the medium flow channel, and the valve plate is used to open or close the medium flow channel;

[0009] A valve seat assembly is arranged on the valve body, the valve seat assembly includes a floating valve seat, a movable gap is provided between the floating valve seat and the valve body along the axial direction of the medium flow channel, the floating valve seat can move in the movable gap along the axial direction of the medium flow channel, the floating valve seat is used to cooperate with the flow channel sealing ring to seal the medium flow channel, and the matching surface of the floating valve seat and the flow channel sealing ring is an inclined surface;

[0010] The O-type sealing ring is arranged on the valve body, the floating valve seat and the O-type sealing ring are in contact and cooperation along the axial direction of the medium flow channel, the O-type sealing ring is used to seal between the floating valve seat and the valve body, and the O-type sealing ring is located in the active gap.

[0011] Optionally, the O-ring is a rubber sealing ring.

[0012] Optionally, the valve seat assembly further comprises a first limiting component, and the first limiting component is used to limit the axial position of the floating valve seat along the medium flow channel.

[0013] Optionally, the first limiting component is a limiting ring.

[0014] Optionally, the valve seat assembly further includes a second position-limiting component, which is disposed on the valve body, and the second position-limiting component abuts and cooperates with the first position-limiting component along the axial direction of the medium flow channel.

[0015] Optionally, the second limiting component is a retaining ring.

[0016] Optionally, the valve seat assembly further comprises a locking component, wherein the locking component is disposed on the first limiting component, and the locking component abuts and cooperates with the floating valve seat along the axial direction of the medium flow channel.

[0017] Optionally, the locking component is a fastening screw, a threaded hole is provided on the first limiting component, and the fastening screw is threadedly connected to the first limiting component.

[0018] Optionally, a first groove is formed on the valve body, and the first groove is used for installing the O-ring.

[0019] Optionally, a second groove is formed on the valve body, and the second groove is used for installing the second limiting component.

[0020] As described above, the utility model has the following beneficial effects: the O-ring is installed on the valve body, and then the valve seat assembly is installed on the valve body, the floating valve seat and the O-ring are abutted and matched, and a movable gap is provided between the valve body and the floating valve seat along the axial direction of the medium flow channel, the movable gap between the floating valve seat and the valve body is supported by the O-ring, and can effectively prevent the medium from leaking from the movable gap position; the installation steps of the existing floating valve seat structure are simplified, making the installation process simpler and more convenient. After the valve seat assembly is installed, when the valve plate is subjected to the positive pressure of the medium, due to the eccentric structural characteristics of the three-eccentric butterfly valve, the valve plate is subjected to a clockwise closing torque, and since the matching surfaces of the flow channel sealing ring and the floating valve seat are inclined surfaces, the sealing specific pressure between the flow channel sealing ring and the floating valve seat increases with the increase of the medium pressure, and the sealing performance becomes better and better; when the valve plate is subjected to the reverse medium pressure, the valve plate is subjected to a counterclockwise opening torque, and as the reverse medium pressure increases, the floating valve seat squeezes the O-ring, and since the O-ring has elastic deformation and the existence of an active gap, when the reverse medium pressure is greater than the elastic force of the O-ring, the floating valve seat squeezes the O-ring and moves in the reverse medium flow direction, thereby increasing the sealing specific pressure between the floating valve seat and the flow channel sealing ring, which is beneficial to reverse sealing. The technical solution shown in the present application can effectively avoid the electric actuator from increasing the closing torque in order to overcome the tendency of the floating valve seat and the flow channel sealing ring to separate when the reverse medium acts, and adopt an O-ring between the floating valve seat and the valve body to achieve the seal between the valve body and the floating valve seat. It is simple and convenient to install, and can effectively prevent the leakage of the medium from the active gap position. At the same time, the floating valve seat can squeeze the O-ring under the action of the reverse medium pressure to produce a slight movement in the direction of the reverse medium pressure, so as to improve the sealing performance between the floating valve seat and the flow channel sealing ring, thereby achieving two-way sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a schematic structural diagram of a bidirectional sealing butterfly valve shown in an embodiment of the utility model;

[0022] Figure 2 Display as Figure 1 Enlarged schematic diagram of the structure of section A in the middle.

[0023] Description of Reference Numerals

[0024] Valve body 1, medium flow channel 101, first groove 102, second groove 103, valve stem 2, valve plate 3, flow channel sealing ring 301, valve seat assembly 4, floating valve seat 401, first limiting component 402, threaded hole 402a, second limiting component 403, locking component 404, movable gap 5, O-ring 6. DETAILED DESCRIPTION

[0025] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0026] See also Figure 1 to Figure 2 . It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the utility model in a schematic manner, so the diagram only shows the components related to the utility model rather than being drawn according to the number, shape and size of the components during actual implementation. During actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated. The structure, proportion, size, etc. illustrated in the drawings attached to this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of the utility model, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the utility model without affecting the effect and purpose that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0027] Before describing the embodiment of the utility model in detail, the application environment of the utility model is described first. The technology of the utility model is mainly applied to the field of valve technology. The utility model is used to solve the problems of the existing three-eccentric butterfly valve bidirectional sealing structure, which has a relatively complex structure, cumbersome assembly process and high assembly difficulty.

[0028] Please combine Figure 1 to Figure 2 As shown, the utility model provides a bidirectional sealing butterfly valve.

[0029] In an exemplary embodiment of the present application, a bidirectional sealing butterfly valve comprises: a valve body 1, provided with a medium flow channel 101, a valve stem 2 is rotatably provided on the valve body 1, a valve plate 3 is provided on the valve stem 2, a flow channel sealing ring 301 is provided on the valve plate 3, the valve plate 3 is located in the medium flow channel 101, and the valve plate 3 is used to open or close the medium flow channel 101; a valve seat assembly 4 is arranged on the valve body 1, and the valve seat assembly 4 comprises a floating valve seat 401, and there is an active gap 5 between the floating valve seat 401 and the valve body 1 along the axial direction of the medium flow channel 101, and the floating valve seat 401 is provided with a movable gap 5 along the axial direction of the medium flow channel 101. The valve seat 401 can move in the movable gap 5 along the axial direction of the medium flow channel 101. The floating valve seat 401 is used to cooperate with the flow channel sealing ring 301 to seal the medium flow channel 101, and the matching surfaces of the floating valve seat 401 and the flow channel sealing ring 301 are inclined surfaces; the O-ring 6 is arranged on the valve body 1, and the floating valve seat 401 and the O-ring 6 are in axial contact and cooperation with each other along the medium flow channel 101. The O-ring 6 is used to seal between the floating valve seat 401 and the valve body 1, and the O-ring 6 is located in the movable gap 5.

[0030] In this embodiment, the O-ring 6 is installed on the valve body 1, and then the valve seat assembly 4 is installed on the valve body 1. The floating valve seat 401 is abutted against the O-ring 6, and a movable gap 5 is provided between the valve body 1 and the floating valve seat 401 along the axial direction of the medium flow channel 101. The movable gap 5 between the floating valve seat 401 and the valve body 1 is supported by the O-ring 6, and can effectively prevent the medium from leaking from the position of the movable gap 5. The installation steps of the existing floating valve seat structure are simplified, making the installation process simpler and more convenient. After the valve seat assembly 4 is installed, when the valve plate 3 is subjected to the positive pressure of the medium, due to the eccentric structural characteristics of the three-eccentric butterfly valve, the valve plate 3 is subjected to a closing torque of clockwise rotation, and since the matching surfaces of the flow channel sealing ring 301 and the floating valve seat 401 are inclined surfaces, the sealing specific pressure between the flow channel sealing ring 301 and the floating valve seat 401 increases with the increase of the medium pressure, and the sealing performance becomes better and better; when the valve plate 3 is subjected to the reverse medium pressure, the valve plate 3 is subjected to an opening torque of counterclockwise rotation, and as the reverse medium pressure increases, the contact between the floating valve seat 401 and the O-ring 6 becomes closer, and since the O-ring 6 has elastic deformation and the existence of the active gap 5, when the reverse medium pressure is greater than the elastic force of the O-ring 6, the floating valve seat 401 squeezes the O-ring 6 and moves toward the reverse medium flow direction, so that the sealing specific pressure between the floating valve seat 401 and the flow channel sealing ring 301 is increased, which is beneficial to the reverse sealing. The technical solution shown in the present application can effectively avoid the electric actuator from increasing the closing torque in order to overcome the tendency of the floating valve seat 401 and the flow channel sealing ring 301 to separate when the reverse medium acts, and adopt an O-ring 6 between the floating valve seat 401 and the valve body 1 to achieve the sealing between the valve body 1 and the floating valve seat 401. It is simple and convenient to install, and can effectively prevent the leakage of the medium from the active gap 5. At the same time, the floating valve seat 401 can squeeze the O-ring 6 under the action of the reverse medium pressure to produce a slight movement in the direction of the reverse medium pressure, so as to improve the sealing performance between the floating valve seat 401 and the flow channel sealing ring 301, thereby achieving two-way sealing.

[0031] It is worth noting that the inclined matching surfaces of the floating valve seat 401 and the flow channel sealing ring 301 are inclined toward the medium flow channel 101 along the flow direction of the forward medium.

[0032] In an exemplary embodiment of the present application, the O-ring 6 is a rubber sealing ring.

[0033] In this embodiment, a sealing ring made of rubber is used so that the O-ring 6 has a certain elastic deformation, thereby enabling the floating valve seat 401 to move slightly along the axial direction of the medium flow channel 101 .

[0034] In an exemplary embodiment of the present application, the valve seat assembly 4 further includes a first position limiting component 402 , and the first position limiting component 402 is used to limit the axial position of the floating valve seat 401 along the medium flow channel 101 .

[0035] In this embodiment, the first limiting component 402 is used to limit the floating valve seat 401 along the flow direction of the positive medium. When the valve plate 3 is subjected to the positive medium pressure, the first limiting component 402 maintains the relative position of the floating valve seat 401 fixed, maintains the contact relationship between the floating valve seat 401 and the O-ring 6, and prevents the medium from leaking in the active gap 5.

[0036] In an exemplary embodiment of the present application, the first limiting component 402 is a limiting ring.

[0037] In this embodiment, the first limiting component 402 is an annular limiting ring to achieve the purpose of limiting the floating valve seat 401 while avoiding affecting the medium flow channel 101 .

[0038] In an exemplary embodiment of the present application, the valve seat assembly 4 further includes a second position limiting component 403 , which is disposed on the valve body 1 , and the second position limiting component 403 abuts against the first position limiting component 402 along the axial direction of the medium flow channel 101 .

[0039] In this embodiment, the second limiting component 403 is used to limit the installation of the first limiting component 402 .

[0040] In an exemplary embodiment of the present application, the second limiting component 403 is a retaining ring.

[0041] In this embodiment, the second limiting component 403 is an annular retaining ring, which achieves the purpose of limiting the installation of the first limiting component 402 and avoids affecting the medium flow channel 101.

[0042] In an exemplary embodiment of the present application, the valve seat assembly 4 further includes a locking component 404 , which is disposed on the first limiting component 402 , and the locking component 404 abuts and cooperates with the floating valve seat 401 along the axial direction of the medium flow channel 101 .

[0043] In this embodiment, the locking component 404 is used to provide a pre-tightening force for the installation of the floating valve seat 401 , so that the connection between the floating valve seat 401 and the O-ring 6 satisfies the sealing performance between the floating valve seat 401 and the valve body 1 .

[0044] In an exemplary embodiment of the present application, the locking component 404 is a fastening screw, a threaded hole 402 a is provided on the first position-limiting component 402 , and the fastening screw is threadedly connected to the first position-limiting component 402 .

[0045] In this embodiment, the locking component 404 is tightened with an appropriate torque according to the pre-tightening force of the contact seal between the floating valve seat 401 and the O-ring 6, so that the floating valve seat 401 squeezes the O-ring 6, and the contact pre-tightening force between the floating valve seat 401 and the O-ring 6 meets the sealing performance.

[0046] In an exemplary embodiment of the present application, a first groove 102 is formed on the valve body 1 , and the first groove 102 is used to install the O-ring 6 .

[0047] In this embodiment, a first groove 102 for installing an O-ring 6 is processed on the valve body 1. The diameter of the O-ring 6 is greater than the groove depth of the first groove 102. The O-ring 6 protrudes from the valve body 1 and contacts the floating valve seat 401, so that a movable gap 5 is formed between the floating valve seat 401 and the valve body 1.

[0048] In an exemplary embodiment of the present application, a second groove 103 is formed on the valve body 1 , and the second groove 103 is used to install the second limiting component 403 .

[0049] In this embodiment, the wall thickness of the solid ring of the second limiting component 403 is greater than the groove depth of the second groove 103, and the second limiting component 403 protrudes from the second groove 103, and the protruding part abuts and cooperates with the first limiting component 402, thereby realizing axial limitation of the first limiting component 402 along the medium flow channel 101.

[0050] Working principle: a first groove 102 for placing the O-ring 6 is processed on the valve body 1, and the O-ring 6 of appropriate size is first placed in the first groove 102, and then the floating valve seat 401, the first limiting component 402, and the second limiting component 403 are sequentially installed into the valve body 1, and the locking component 404 is tightened with a suitable torque to squeeze the O-ring 6 to prevent the medium from leaking from the active gap 5. After the valve seat assembly 4 is installed, the active gap 5 still exists. When the valve plate 3 is subjected to positive pressure from the medium, due to the eccentric structural characteristics of the three-eccentric butterfly valve, the valve plate 3 is subjected to a clockwise closing torque, and since the mating surfaces of the flow channel sealing ring 301 and the floating valve seat 401 are inclined surfaces, the sealing specific pressure between the flow channel sealing ring 301 and the floating valve seat 401 increases with the increase of the medium pressure, and the sealing performance becomes better and better; when the valve plate 3 is subjected to reverse medium pressure, the valve plate 3 is subjected to a counterclockwise opening torque, and as the reverse medium pressure increases, the floating valve seat 401 squeezes the O-ring 6, and since the O-ring 6 has elastic deformation and the existence of the active gap 5, when the reverse medium pressure is greater than the elastic force of the O-ring 6, the floating valve seat 401 squeezes the O-ring 6 and moves toward the reverse medium flow direction, thereby increasing the sealing specific pressure between the floating valve seat 401 and the flow channel sealing ring 301, which is beneficial to reverse sealing. The technical solution shown in the present application can effectively avoid the electric actuator from increasing the closing torque in order to overcome the tendency of the floating valve seat 401 and the flow channel sealing ring 301 to separate when the reverse medium acts, and adopt an O-ring 6 between the floating valve seat 401 and the valve body 1 to achieve the sealing between the valve body 1 and the floating valve seat 401. It is simple and convenient to install, and can effectively prevent the leakage of the medium from the active gap 5. At the same time, the floating valve seat 401 can squeeze the O-ring 6 under the action of the reverse medium pressure to produce a slight movement in the direction of the reverse medium pressure, so as to improve the sealing performance between the floating valve seat 401 and the flow channel sealing ring 301, thereby achieving two-way sealing.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A two-way sealing butterfly valve, characterized in that: include: A valve body is provided with a medium flow channel, a valve stem is rotatably provided on the valve body, a valve plate is provided on the valve stem, a flow channel sealing ring is provided on the valve plate, the valve plate is located in the medium flow channel, and the valve plate is used to open or close the medium flow channel; A valve seat assembly is arranged on the valve body, the valve seat assembly includes a floating valve seat, a movable gap is provided between the floating valve seat and the valve body along the axial direction of the medium flow channel, the floating valve seat can move in the movable gap along the axial direction of the medium flow channel, the floating valve seat is used to cooperate with the flow channel sealing ring to seal the medium flow channel, and the matching surface of the floating valve seat and the flow channel sealing ring is an inclined surface; The O-type sealing ring is arranged on the valve body, the floating valve seat and the O-type sealing ring are in contact and cooperation along the axial direction of the medium flow channel, the O-type sealing ring is used to seal between the floating valve seat and the valve body, and the O-type sealing ring is located in the active gap.

2. The bidirectional sealing butterfly valve according to claim 1, characterized in that: The O-type sealing ring is a rubber sealing ring.

3. The bidirectional sealing butterfly valve according to claim 1, characterized in that: The valve seat assembly further comprises a first limiting component, and the first limiting component is used to limit the axial position of the floating valve seat along the medium flow channel.

4. The bidirectional sealing butterfly valve according to claim 3 is characterized in that: The first limiting component is a limiting ring.

5. The bidirectional sealing butterfly valve according to claim 3, characterized in that: The valve seat assembly further includes a second position-limiting component, which is disposed on the valve body and abuts against the first position-limiting component along the axial direction of the medium flow channel.

6. The bidirectional sealing butterfly valve according to claim 5, characterized in that: The second limiting component is a retaining ring.

7. The bidirectional sealing butterfly valve according to claim 4, characterized in that: The valve seat assembly further comprises a locking component, wherein the locking component is arranged on the first limiting component, and the locking component abuts and cooperates with the floating valve seat along the axial direction of the medium flow channel.

8. The bidirectional sealing butterfly valve according to claim 7, characterized in that: The locking component is a fastening screw, a threaded hole is provided on the first limiting component, and the fastening screw is threadedly connected to the first limiting component.

9. The bidirectional sealing butterfly valve according to claim 5, characterized in that: The valve body is provided with a first groove, and the first groove is used for installing the O-ring.

10. The bidirectional sealing butterfly valve according to claim 9, characterized in that: The valve body is provided with a second groove, and the second groove is used for installing the second limiting component.

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