Double floating double direction sealing flat valve

Abstract

The application discloses a double-floating bidirectional sealing flat valve, and relates to the technical field of valves.The double-floating bidirectional sealing flat valve comprises a valve body, a valve cover, a valve rod and a gate plate, the gate plate is arranged on the valve rod and located in the valve body, the valve cover is arranged on the valve body and used for sealing the valve body, the valve rod penetrates through the valve cover, a valve seat is arranged in the valve body, the valve seat is movably connected with the valve body, and the valve seat is attached to the surface of the gate plate.With the opening and closing of the valve, the valve seat will relatively move in the valve body under the high pressure of the medium, a piston effect is formed, the sealing surface of the valve seat can be completely attached to the surface of the gate plate, the gap between the sealing surface and the surface of the gate plate is avoided, and the sealing effect of the valve body and the valve seat in the radial direction and the axial direction and the sealing effect of the gate plate and the valve seat in the radial direction are ensured.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically, to a double-floating bidirectional sealing flat plate valve. Background Technology

[0002] One reason for the poor sealing performance of existing flat-plate valves is the presence of a "gap" between the valve seat and the gate. This gap is mainly caused by factors such as machining accuracy errors in parts, wear and deformation during long-term use, and fluctuations in medium pressure. The gap not only becomes a leakage channel for high-pressure media, but when the medium enters the gap, it also creates an unbalanced pressure distribution, generating lateral forces that further deviate the valve seat from the gap or widen it, thus creating a vicious cycle. Therefore, how to effectively avoid the formation of gaps to optimize the sealing performance of flat-plate valves is the technical problem this application aims to solve. Summary of the Invention

[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, the present invention provides a double floating bidirectional sealing flat plate valve, comprising: a valve body, a valve cover, a valve stem, and a gate, wherein the gate is disposed on the valve stem and located within the valve body, the valve cover is disposed on the valve body for sealing the valve body, the valve stem passes through the valve cover, a valve seat is disposed within the valve body, the valve seat is movably connected to the valve body, and the valve seat is abutted against the surface of the gate.

[0005] Preferably, the gate has a sealing area for preventing the flow of media and a flow hole for the flow of media.

[0006] Preferably, the gate plate is provided with a first sealing groove and a second sealing groove, the first sealing groove being provided along the outer edge of the sealing area and the second sealing groove being provided along the outer edge of the flow hole.

[0007] Preferably, the valve seat is composed of two identical bidirectional sealing tubes, which are located on both sides of the gate. When the valve is closed, the bidirectional sealing tube is connected to the first sealing groove; When the valve is opened, the bidirectional sealing tube connects to the second sealing groove.

[0008] Preferably, the inner wall of the valve body is provided with a first annular groove for placing a bidirectional sealing tube. The inner diameter of the first annular groove is larger than the outer diameter of the bidirectional sealing tube. One end of the bidirectional sealing tube abuts against the inner end face of the first annular groove, and the other end abuts against the gate.

[0009] Preferably, the bidirectional sealing tube is provided with a first sealing ring at one end near the gate and a second sealing ring at the other end away from the gate, and a plurality of third sealing rings are provided on the outer wall of the bidirectional sealing tube; The first and second sealing rings are used to achieve radial sealing of the valve seat on the valve body; The third sealing ring is used to achieve axial sealing of the valve seat on the valve body.

[0010] Preferably, the edge of the first sealing ring is a bevel, and the inner wall shapes of the first and second sealing grooves are adapted to the outer wall shape of the first sealing ring.

[0011] Preferably, the outer wall of the bidirectional sealing tube is provided with a plurality of second annular grooves, the number of the second annular grooves being the same as the number of the third sealing rings, and the third sealing rings being disposed within the second annular grooves.

[0012] Preferably, the end of the bidirectional sealing tube away from the gate is provided with a third annular groove, and the second sealing ring is disposed in the third annular groove; After the flat panel valve is assembled, the second sealing ring is in a compressed state and always tends to reset.

[0013] Preferably, the inner end face of the first annular groove is provided with an annular limiting protrusion, the second sealing ring is a hollow annular structure, and the side of the second sealing ring facing the limiting protrusion is provided with a limiting groove that is adapted to the limiting protrusion.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: As the valve opens and closes, under the high pressure of the medium, the valve seat will move relative to the valve body, forming a piston effect. This allows the sealing surface of the valve seat to completely fit against the surface of the gate, preventing gaps and ensuring the sealing effect of the valve body and valve seat in the radial and axial directions, as well as the sealing effect of the gate and valve seat in the radial direction.

[0015] The dual-floating bidirectional sealing flat plate valve of the present invention, other advantages, objectives and features of the present invention will be apparent in part from the following description, and in part will be understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the double-floating bidirectional sealing flat plate valve described in this invention.

[0017] Figure 2 This is a cross-sectional view of the double-floating bidirectional sealing flat plate valve described in this invention.

[0018] Figure 3 This is an exploded view of the gate and the bidirectional sealing tube (some structures are not shown).

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the gate and the bidirectional sealing tube (some structures are not shown).

[0020] Figure 5 This is a cross-sectional view of the gate and the bidirectional sealing tube.

[0021] Figure 6 This is a cross-sectional schematic diagram of the bidirectional sealing tube separating from the inner end face of the first annular groove under high pressure.

[0022] Figure 7 A cross-sectional view of the second sealing ring using the second embodiment.

[0023] Figure 8 This is a schematic diagram of the second sealing ring using the second embodiment, where (A) shows the bidirectional sealing tube separated from the inner end face of the first ring groove, (B) shows the bidirectional sealing tube in normal contact with the inner end face of the first ring groove, and (C) shows the second sealing ring sealing when the bidirectional sealing tube is separated from the inner end face of the first ring groove.

[0024] In the figure: 1 Valve body, 2 Valve cover, 3 Valve stem, 4 Gate, 41 Sealing area, 42 Flow hole, 43 First sealing groove, 44 Second sealing groove, 5 Bidirectional sealing tube, 51 Second annular groove, 52 Third annular groove, 6 First sealing ring, 7 Second sealing ring, 8 Third sealing ring, 9 Limiting protrusion. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0026] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0027] like Figures 1-8As shown, the present invention provides a double floating bidirectional sealing flat plate valve, comprising: a valve body 1, a valve cover 2, a valve stem 3, and a gate 4. The gate 4 is disposed on the valve stem 3 and located inside the valve body 1. The valve cover 2 is disposed on the valve body 1 and is used to seal the valve body 1. The valve stem 3 passes through the valve cover 2. The valve body 1, valve cover 2, and valve stem 3 are all prior art. A valve seat is disposed inside the valve body 1. The valve seat is movably connected to the valve body 1. As the valve opens and closes, under the high pressure of the medium, the valve seat will move relative to the valve body 1, so that the sealing surface of the valve seat can completely fit against the surface of the gate 4, thereby ensuring the sealing effect of the valve body 1 and the valve seat in the radial and axial directions, as well as the sealing effect of the gate 4 and the valve seat in the radial direction.

[0028] Furthermore, the gate 4 has a sealing area 41 for preventing the flow of medium and a flow hole 42 for the flow of medium; When the valve is closed, the sealing area 41 seals the valve body 1, and the valve seat is attached to the surface of the gate 4. Under the action of the high pressure medium, the valve seat located at the medium inflow end will move towards the gate 4, making the valve seat and the gate 4 squeeze more tightly. At this time, the valve seat and the valve body 1 can maintain a seal in the radial and axial directions, and the sealing effect is ensured through bidirectional sealing. When the valve is open, the medium in the valve body 1 can flow through the flow hole 42. The pressure on the valve seat at the medium inflow end is less than when the valve is closed, and the valve seat will not move much. At this time, the valve seat can still fit against the edge of the flow hole 42 to prevent high pressure medium leakage. The valve seat at the medium outflow end is affected by the high pressure medium and will move. At this time, the valve seat at the medium outflow end can still fit against the edge of the flow hole 42 to prevent high pressure medium leakage.

[0029] Furthermore, the valve seat is composed of two identical bidirectional sealing tubes 5, which are located on both sides of the gate plate 4, so that the flat plate valve does not need to distinguish between the positive and negative sides when in use. The inner wall of the valve body 1 is provided with a first annular groove for placing the bidirectional sealing tube 5. The inner diameter of the first annular groove is larger than the outer diameter of the bidirectional sealing tube 5, so that the bidirectional sealing tube 5 can be stuck in the first annular groove. After the flat valve is assembled, one end of the bidirectional sealing tube 5 abuts against the inner end face of the first annular groove, and the other end abuts against the gate plate 4. The inner end face of the first annular groove provides support for fixing the bidirectional sealing tube 5 in the valve body 1.

[0030] Furthermore, a first sealing ring 6 is provided at one end of the bidirectional sealing tube 5 near the gate plate 4, and a second sealing ring 7 is provided at the other end away from the gate plate 4. Both the first sealing ring 6 and the second sealing ring 7 can be fixed to the end of the bidirectional sealing tube 5 with screws. Several third sealing rings 8 are provided on the outer wall of the bidirectional sealing tube 5. The first sealing ring 6 is used to achieve radial sealing of the valve seat on the gate 4 to prevent leakage when the valve is open or closed; The second sealing ring 7 is used to achieve radial sealing of the valve seat on the valve body 1. Under the high pressure of the medium, the valve seat can slide in the first ring groove. The second sealing ring 7 can maintain the seal between the valve seat and the valve body 1 when the valve seat slides. The third sealing ring 8 is used to achieve axial sealing of the valve seat on the valve body 1. The third sealing ring 8 can cooperate with the second sealing ring 7. Once the valve seat slides and the second sealing ring 7 fails to seal, the third sealing ring 8 can assist in sealing to prevent high pressure medium from leaking from the valve seat.

[0031] Furthermore, the outer wall of the bidirectional sealing tube 5 is provided with a plurality of second annular grooves 51, the number of which is the same as the number of third sealing rings 8. The third sealing rings 8 are disposed in the second annular grooves 51. Typically, the outer diameter of the third sealing rings 8 is slightly larger than the outer diameter of the bidirectional sealing tube 5. This allows a portion of the third sealing rings 8 to protrude from the outer wall of the bidirectional sealing tube 5 after being installed in the second annular grooves 51. When installing the valve seat, the inner wall of the first annular groove can compress the outer wall of the third sealing rings 8, allowing the third sealing rings 8 to be pressed into the second annular grooves 51. This ensures that the third sealing rings 8 always have a tendency to reset, thereby guaranteeing the axial seal between the valve seat and the valve body 1.

[0032] Furthermore, a third annular groove 52 is provided at the end of the bidirectional sealing tube 5 away from the gate plate 4, and the second sealing ring 7 is disposed in the third annular groove 52. By providing the third annular groove 52, a space can be provided for the installation of the second sealing ring 7, so that the second sealing ring 7 does not need to be installed at the end of the bidirectional sealing tube 5 with screws, but can be directly installed in the third annular groove 52. When the second sealing ring 7 is installed in the third annular groove 52, a part of the second sealing ring 7 will protrude from the end of the bidirectional sealing tube 5. Thus, when the valve seat slides, the second sealing ring 7 can always abut against the inner end face of the first annular groove. After the flat panel valve is assembled, the second sealing ring 7 is pressed into the third ring groove 52, thereby strengthening the connection between the second sealing ring 7 and the third ring groove 52. At the same time, the second sealing ring 7 is in a compressed state and always has a tendency to reset. Thus, when the valve seat slides, the second sealing ring 7 can always abut against the inner end face of the first ring groove, thereby allowing the bidirectional sealing tube 5 to always fit against the surface of the gate plate 4. This enables the flat panel valve to achieve zero leakage in both unidirectional (when the valve is closed) and bidirectional (when the valve is open) states, ensuring the valve's sealing performance.

[0033] Furthermore, the gate 4 is provided with a first sealing groove 43 and a second sealing groove 44. The first sealing groove 43 is provided along the outer edge of the sealing area 41, and the second sealing groove 44 is provided along the outer edge of the flow hole 42, such as... Figure 3 As shown; When the valve is closed, the bidirectional sealing pipe 5 is connected to the first sealing groove 43; When the valve is opened, the bidirectional sealing pipe 5 is connected to the second sealing groove 44.

[0034] When the valve is opened from the closed state, as the gate 4 moves upward, the bidirectional sealing tube 5 will first come out of the first sealing groove 43. During the process of coming out, the bidirectional sealing tube 5 will move axially, so that the operator can feel the movement of the gate 4 by rotating the handwheel.

[0035] When the gate 4 is moved to the open position, under the action of the high pressure medium, the bidirectional sealing tube 5 will be inserted into the second sealing groove 44, so that the flow hole 42 can be sealed by the two bidirectional sealing tubes 5. At the same time, the operator can feel that the gate 4 has moved to the designated position by rotating the handwheel.

[0036] Furthermore, the edge of the first sealing ring 6 is beveled, meaning the end face of the first sealing ring 6 near the gate 4 is thinner, and the inner wall shapes of the first sealing groove 43 and the second sealing groove 44 are adapted to the outer wall shape of the first sealing ring 6, such as... Figure 4 and Figure 5 As shown, by setting the edge of the first sealing ring 6 as a bevel, the bidirectional sealing tube 5 can easily detach from and enter the two sealing grooves during the up-and-down movement of the gate 4.

[0037] In the aforementioned embodiments, the second sealing ring 7 is typically an elastic annular sealing ring. When this embodiment is adopted, if it is directly installed with screws, the overall structure of the sealing ring will be damaged, leading to a reduction in service life. If a third annular groove 52 is provided, the size requirements for the second sealing ring 7 are more stringent. If the size is just right to fit into the third annular groove 52, the deformation space is insufficient, and when assembling the flat valve, the end of the bidirectional sealing tube 5 will not be able to abut against the inner end face of the first annular groove, thus affecting the sealing effect. If the size is too large, it cannot be placed into the third annular groove 52. If the size is too small, it is easy to fall off during assembly, and because the size is too small, the deformation space provided by the third annular groove 52 is too large. Under the action of high pressure medium, the second sealing ring 7 may be completely pressed into the third annular groove 52, causing the radial seal between the valve seat and the valve body 1 to fail.

[0038] Typically, the size of the second sealing ring 7 is designed to be slightly smaller than that of the third annular groove 52 to allow for deformation space. To avoid radial seal failure due to excessively small dimensions, a fourth annular groove can be additionally provided on the outer wall of the bidirectional sealing tube 5. This fourth annular groove is located at the end of the bidirectional sealing tube 5, making it a double-open groove. The two openings are located on the outer wall of the bidirectional sealing tube 5 and the end face near the gate 4, respectively. Figure 4 and Figure 5 As shown, a fourth sealing ring is added in the fourth annular groove. The fourth sealing ring abuts against both the inner end face of the first annular groove and the inner wall face of the first annular groove. The fourth sealing ring is used as a redundant design to prevent media leakage when the size of the second sealing ring 7 is too small or when radial sealing failure occurs due to reaching the end of its service life.

[0039] Furthermore, the inner end face of the first annular groove is provided with an annular limiting protrusion 9. The second sealing ring 7 is a hollow annular structure. The hollow design allows a cavity to be formed inside the second sealing ring 7. The cavity is in a non-vacuum state, providing sufficient deformation space for the second sealing ring 7. This significantly relaxes the size requirements for the second sealing ring 7 and reduces production difficulty. After the flat valve is assembled, a portion of the limiting protrusion 9 extends into the third annular groove 52. The side of the second sealing ring 7 facing the limiting protrusion 9 is provided with a limiting groove that adapts to the limiting protrusion 9, allowing the second sealing ring 7 to wrap around the limiting protrusion 9. Because the limiting protrusion 9 extends into the third annular groove 52, the contact area between the second sealing ring 7 and the limiting protrusion 9 is increased, further improving the sealing performance. Figure 8 As shown in (B).

[0040] By setting a hollow cavity and a limiting protrusion 9, when the end face of the bidirectional sealing tube 5 separates from the inner end face of the first annular groove, the high-pressure medium will cause the part of the second sealing ring 7 in contact with the medium to deform. The limiting protrusion 9 will then block the deformed second sealing ring 7. Figure 8 As shown in (C), this is to prevent the second sealing ring 7 from flipping up under the action of high pressure medium, which would cause radial seal failure.

[0041] Furthermore, in order to allow the second sealing ring 7 to adapt to the movement of the bidirectional sealing tube 5 and to ensure that it always abuts against the inner end face of the first annular groove, the cross-section of the third annular groove 52 is trapezoidal, that is, the thickness of the inner end face of the third annular groove 52 is less than the opening thickness of the third annular groove 52, such as... Figure 8 As shown, the shape of the second sealing ring 7 is adapted to the third ring groove 52, so that it can be guided in the direction of its reset after being compressed.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A double-floating bidirectional sealing flat plate valve, comprising: The valve body (1), valve cover (2), valve stem (3) and gate (4) are provided on the valve stem (3) and located inside the valve body (1). The valve cover (2) is provided on the valve body (1) and is used to seal the valve body (1). The valve stem (3) passes through the valve cover (2). The valve body (1) is characterized by having a valve seat inside the valve body (1), which is movably connected to the valve body (1) and is attached to the surface of the gate (4). The gate (4) has a sealing area (41) for preventing the flow of medium and a flow hole (42) for the flow of medium. The gate (4) is provided with a first sealing groove (43) and a second sealing groove (44). The first sealing groove (43) is provided along the outer edge of the sealing area (41), and the second sealing groove (44) is provided along the outer edge of the flow hole (42). The valve seat is composed of two identical bidirectional sealing tubes (5), which are located on both sides of the gate (4); When the valve is closed, the bidirectional sealing tube (5) is connected to the first sealing groove (43); When the valve is opened, the bidirectional sealing tube (5) is connected to the second sealing groove (44); The inner wall of the valve body (1) is provided with a first annular groove for placing the bidirectional sealing tube (5). The inner diameter of the first annular groove is larger than the outer diameter of the bidirectional sealing tube (5). One end of the bidirectional sealing tube (5) abuts against the inner end face of the first annular groove, and the other end abuts against the gate plate (4). The bidirectional sealing tube (5) is provided with a first sealing ring (6) at one end near the gate (4) and a second sealing ring (7) at the other end away from the gate (4). The outer wall of the bidirectional sealing tube (5) is provided with a plurality of third sealing rings (8). The first sealing ring (6) and the second sealing ring (7) are used to achieve radial sealing of the valve seat on the valve body (1); The third sealing ring (8) is used to achieve axial sealing of the valve seat on the valve body (1); The bidirectional sealing tube (5) is provided with a third annular groove (52) at the end away from the gate (4). The cross-section of the third annular groove (52) is trapezoidal. The thickness of the inner end face of the third annular groove (52) is less than the thickness of its opening. The second sealing ring (7) is provided in the third annular groove (52). When the flat plate valve is assembled, the second sealing ring (7) is in a compressed state and always has a tendency to reset. The inner end face of the first annular groove is provided with an annular limiting protrusion (9), the second sealing ring (7) is a hollow annular structure, and the side of the second sealing ring (7) facing the limiting protrusion (9) is provided with a limiting groove that is compatible with the limiting protrusion (9). After the flat plate valve is assembled, a portion of the limiting protrusion (9) extends into the third annular groove (52) and cooperates with the limiting groove of the second sealing ring (7), so that the second sealing ring (7) wraps around the limiting protrusion (9). The outer wall end of the bidirectional sealing tube (5) is also provided with a fourth annular groove. The fourth annular groove is a groove with two openings. The two openings are located on the outer wall of the bidirectional sealing tube (5) and the end face near the gate (4), respectively. A fourth sealing ring is provided in the fourth annular groove. The fourth sealing ring abuts against both the inner end face of the first annular groove and the inner wall face of the first annular groove. The fourth sealing ring serves as a redundant sealing structure.

2. The double-floating bidirectional sealing flat valve according to claim 1, characterized in that, The edge of the first sealing ring (6) is a bevel, and the inner wall shape of the first sealing groove (43) and the second sealing groove (44) is adapted to the outer wall shape of the first sealing ring (6).

3. The double-floating bidirectional sealing flat plate valve according to claim 1, characterized in that, The outer wall of the bidirectional sealing tube (5) is provided with a plurality of second annular grooves (51), the number of second annular grooves (51) being the same as the number of third sealing rings (8), and the third sealing rings (8) being disposed in the second annular grooves (51).

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