Flat gate valve

Abstract

Provided in the present invention is a flat gate valve, comprising: a gate valve body, which is provided with a valve cavity therein and valve ports on both sides that are in communication with the valve cavity; two gate plates, which are spaced apart in the valve cavity; a spreading and retracting mechanism, which is connected to the two gate plates; and a lifting drive mechanism, which is connected at the top of the gate valve body and is connected to the spreading and retracting mechanism. When the lifting drive mechanism drives the spreading and retracting mechanism to descend, the two gate plates can spread apart at the valve port positions and block the two valve ports respectively; when the lifting drive mechanism drives the spreading and retracting mechanism to ascend, the two gate plates can retract at the valve port positions and move away from the two valve ports respectively. The design of the flat gate valve reduces the overall weight, and also reduces the wear of first sealing rings, thereby prolonging the service life of the first sealing rings.

Description

A flat gate valve Technical Field

[0001] This invention belongs to the field of self-closing valve technology, and more specifically, relates to a flat gate valve. Background Technology

[0002] Existing flat gate valves have flow guide holes on their gates, resulting in relatively large gate sizes. To avoid the gate body restricting the gate's movement, a receiving cavity is set at the bottom of the gate body to accommodate the gate. This leads to an excessively large lower volume of the gate body, increasing the overall weight of the flat gate valve and reducing its performance. In addition, during the opening or closing process, the gate moves against the end of the valve orifice located in the valve cavity, which can cause wear on the soft seal between the gate and the valve orifice, reducing the service life of the soft seal. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a flat gate valve that solves the problem that the gate of existing flat gate valves has a large size due to the presence of flow guide holes, resulting in an excessively large lower volume of the gate valve body, which increases the overall weight of the flat gate valve and reduces its performance. It also solves the problem that the gate of existing flat gate valves moves along the valve hole at one end of the valve cavity, which easily causes wear on the soft seal and reduces its service life.

[0004] To achieve the above objectives, the present invention provides a flat gate valve, the flat gate valve comprising:

[0005] The gate valve body has a valve cavity inside, and valve holes communicating with the valve cavity are provided on both sides of the gate valve body;

[0006] Two gates are spaced apart within the valve cavity;

[0007] An opening and closing mechanism is provided, which is connected to the two gates.

[0008] A lifting drive mechanism is connected to the top of the gate valve body and is connected to the opening and closing mechanism. The two gate plates can open at the valve hole position and block the two valve holes respectively when the lifting drive mechanism drives the opening and closing mechanism to descend. The two gate plates can close at the valve hole position and move away from the two valve holes respectively when the lifting drive mechanism drives the opening and closing mechanism to rise.

[0009] Preferably, the flat gate valve further includes:

[0010] Two valve seat rings are respectively connected to the inner side of the two valve holes that are close to each other.

[0011] Two first sealing rings are respectively connected to the surfaces of the two gates that are far apart from each other. When the two gates respectively block the two valve holes, the two first sealing rings respectively fit with the two valve seat rings.

[0012] Preferably, the spreading and retracting mechanism includes:

[0013] Two driven sliders are respectively connected to the surfaces of the two gates that are close to each other. The surfaces of the two driven sliders that are close to each other are inclined surfaces. The distance between the two driven sliders gradually narrows from top to bottom.

[0014] An active slider is connected at its top to the lifting drive mechanism. The active slider has inclined surfaces on both sides, and the distance between the two sides of the active slider gradually narrows from top to bottom. The active slider slides between two driven sliders.

[0015] A baffle is connected to the bottom of the active slider, and the baffle can fit against the bottom of the driven slider;

[0016] Multiple elastic elements are distributed between the two gates. The two ends of each elastic element are connected to the adjacent surfaces of the two gates. The adjacent surfaces of the two driven sliders can respectively adhere to the two sides of the active slider when the elastic element contracts.

[0017] Preferably, the opening and closing mechanism further includes two flat keys, which are respectively connected to the two sides of the active slider. The surfaces of the two driven sliders that are close to each other are provided with keyways, and the two flat keys are respectively slidably connected in the two keyways.

[0018] Preferably, the spreading and retracting mechanism further includes:

[0019] Two guide blocks, one end of which is connected to the active slider, and the other end of each guide block is provided with a guide groove;

[0020] Two guide rails are connected to each other inside the valve cavity, and two guide grooves are slidably connected to the two guide rails respectively.

[0021] Preferably, the gate valve body includes:

[0022] Valve body;

[0023] A valve cover, which is attached to the top of the valve body.

[0024] Preferably, the lifting drive mechanism includes:

[0025] A valve stem extends through the top of the gate valve body, and the bottom end of the valve stem is connected to the opening and closing mechanism;

[0026] A drive device is connected to the top of the gate valve body, and the drive end of the drive device is connected to the top of the valve stem.

[0027] Preferably, a support body is formed at the bottom of the valve cavity and below the two valve holes. The two supports are respectively able to support the two gates so that the center of the gate is on the axis of the valve hole and the bottom of the gate can slide on the support body.

[0028] Preferably, the two valve holes are provided with annular grooves at their close ends, and the two valve seat rings are respectively disposed in the two annular grooves. The flat gate valve also includes two second sealing rings, which are respectively connected to the surfaces of the two valve seat rings that are far apart from each other, and the two second sealing rings are respectively attached to the inner sides of the two annular grooves.

[0029] Preferably, the surface of the valve seat ring is provided with an alloy layer.

[0030] This invention provides a flat gate valve, which has the following advantages: The two gates of this flat gate valve can open at the valve orifice position and respectively block the two valve orifices when the lifting drive mechanism drives the opening and closing mechanism to descend; the two gates can also close at the valve orifice position and move away from the two valve orifices respectively when the lifting drive mechanism drives the opening and closing mechanism to rise. This flat gate valve eliminates the need for a guide hole design, and the gate size does not need to be too large, only large enough to block the valve orifices. Therefore, the valve body no longer needs a cavity to accommodate the gate's lifting and lowering, thus eliminating the lower volume of the valve body, significantly reducing the overall weight, lowering energy consumption, and improving the performance of the flat gate valve. Furthermore, this flat gate valve only has the gate and valve orifice at one end of the valve cavity touching during the moment of opening and closing; during the opening and closing process, the gate and valve orifice at one end of the valve cavity are separated. This reduces wear on the soft seal and extends its service life.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0032] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0033] Figure 1 shows a partial cross-sectional view of a flat gate valve according to an embodiment of the present invention;

[0034] Figure 2 shows an enlarged schematic diagram of the structure at point A in Figure 1;

[0035] Figure 3 shows a three-dimensional structural schematic diagram of a flat gate valve according to an embodiment of the present invention;

[0036] Figure 4 shows a three-dimensional structural diagram of the valve body of a flat gate valve according to an embodiment of the present invention;

[0037] Figure 5 shows a partial three-dimensional structural schematic diagram of a flat gate valve according to an embodiment of the present invention;

[0038] Figure 6 shows a partial three-dimensional structural schematic diagram of a flat gate valve according to an embodiment of the present invention;

[0039] Figure 7 shows a three-dimensional structural schematic diagram of the opening and closing mechanism of a flat gate valve according to an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached drawings: 1. Gate; 2. Valve seat ring; 3. First sealing ring; 4. Driven slider; 5. Driving slider; 6. Baffle; 7. Elastic element; 8. Flat key; 9. Keyway; 10. Guide block; 11. Guide groove; 12. Guide rail; 13. Valve body; 14. Valve cover; 15. Valve stem; 16. Support body; 17. Second sealing ring. Detailed Implementation

[0041] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0042] As shown in Figures 1-3, the present invention provides a flat gate valve, which includes:

[0043] The gate valve body has a valve cavity inside, and valve holes communicating with the valve cavity are provided on both sides of the gate valve body.

[0044] Two gates 1 are spaced apart inside the valve cavity;

[0045] The opening and closing mechanism is connected to the two gates 1;

[0046] The lifting drive mechanism is connected to the top of the gate valve body and is connected to the opening and closing mechanism. The two gate plates 1 can open at the valve hole position and block the two valve holes respectively when the lifting drive mechanism drives the opening and closing mechanism to descend. The two gate plates 1 can close at the valve hole position and move away from the two valve holes respectively when the lifting drive mechanism drives the opening and closing mechanism to rise.

[0047] Specifically, to address the problems of existing flat gate valves where the gate plate, due to its guide hole, is relatively large, resulting in an excessively large lower volume of the gate valve body, increasing the overall weight of the flat gate valve, and reducing its performance, and to address the issue that the gate plate of existing flat gate valves moves along the valve orifice at the end located in the valve cavity, easily causing wear of the soft seal and reducing its service life, this application provides a flat gate valve in which the two gate plates 1 can be opened at the valve orifice position and respectively block the two valve orifices when the lifting drive mechanism drives the opening and closing mechanism to descend, and the two gate plates 1 can be opened at the valve orifice position and respectively block the two valve orifices when the lifting drive mechanism drives the opening and closing mechanism to rise, respectively. With the orifices positioned close together and far from the two valve holes, this flat gate valve eliminates the guide hole design. The size of the gate plate 1 does not need to be too large; it only needs to be able to seal the valve holes. Consequently, the gate valve body no longer needs a cavity to accommodate the rise and fall of the gate plate 1. This eliminates the need for the lower volume of the gate valve body, significantly reducing the overall weight, lowering energy consumption, and improving the performance of the flat gate valve. Furthermore, this flat gate valve only has the gate plate 1 and the valve hole at one end of the valve cavity touching during the moment of opening and closing. During the opening and closing process, the gate plate 1 and the valve hole at one end of the valve cavity are separated. This reduces wear on the soft seal and extends its service life.

[0048] Preferably, the flat gate valve further includes:

[0049] Two valve seat rings 2 are respectively connected to the inner side of the two valve holes that are close to each other;

[0050] Two first sealing rings 3 are respectively connected to the surfaces of the two gates 1 that are far apart from each other. When the two gates 1 block the two valve holes respectively, the two first sealing rings 3 are respectively attached to the two valve seat rings 2.

[0051] Specifically, the first sealing ring 3 is a soft-seal RPTFE. During the closing process of the flat gate valve, the first sealing ring 3 on the gate 1 first contacts the corresponding valve seat ring 2, which improves the sealing performance. The first sealing ring 3 is installed on the gate 1 to reduce the direct scouring of the first sealing ring 3 by the medium when the flat gate valve is fully open, reduce the damage to the first sealing ring 3, and extend the sealing performance of the flat gate valve.

[0052] As shown in Figures 5-7, preferably, the opening and closing mechanism includes:

[0053] Two driven sliders 4 are connected to the surfaces of two gate plates 1 that are close to each other. The surfaces of the two driven sliders 4 that are close to each other are inclined surfaces. The distance between the two driven sliders 4 gradually narrows from top to bottom.

[0054] The active slider 5 is connected to the lifting drive mechanism at its top. The two sides of the active slider 5 are inclined surfaces. The distance between the two sides of the active slider 5 gradually narrows from top to bottom. The active slider 5 slides between two driven sliders 4.

[0055] Baffle 6 is connected to the bottom of the active slider 5, and baffle 6 can fit against the bottom of the driven slider 4.

[0056] Multiple elastic elements 7 are distributed between two gate plates 1. The two ends of each elastic element 7 are connected to the surfaces of the two gate plates 1 that are close to each other. The surfaces of the two driven sliders 4 that are close to each other can fit against the two sides of the active slider 5 when the elastic element 7 contracts.

[0057] Specifically, during the closing process of the flat gate valve, the lifting drive mechanism drives the opening and closing mechanism to move downward. When the bottom of the gate 1 contacts the bottom of the valve cavity, the active slider 5 moves downward. Since the distance between the two driven sliders 4 gradually narrows from top to bottom, and the distance between the two sides of the active slider 5 gradually narrows from top to bottom, the active slider 5 can open the two driven sliders 4. At this time, the two gates 1 move away from each other and block the two valve holes respectively, so as to realize the closing of the flat gate valve.

[0058] During the opening process of the flat gate valve, the lifting drive mechanism drives the opening and closing mechanism to move upward. At this time, the active slider 5 moves upward first. Under the retraction of multiple elastic elements 7 and the guiding action of the inclined surface, the two gate plates 1 can ensure that they are separated from the contact of the two valve seat rings 2 with the minimum distance. At this time, the two gate plates 1 move towards each other and open the two valve holes respectively to realize the opening of the flat gate valve. Then, the lifting drive mechanism continues to drive the active slider 5 to move upward. At this time, the baffle 6 can support the two driven sliders 4. The entire opening and closing mechanism will be moved above the valve holes to realize the full opening of the flat gate valve.

[0059] When the lifting drive mechanism of the flat gate valve works in conjunction with the opening and closing mechanism, it ensures that the gate 1 and the valve seat ring 2 are only in contact during the moment of opening and closing. During the opening and closing process, the gate 1 and the valve seat ring 2 are separated. This reduces the wear of the first sealing ring 3 and extends its service life.

[0060] Preferably, the opening and closing mechanism further includes two flat keys 8, which are respectively connected to the two sides of the active slider 5. The surfaces of the two driven sliders 4 that are close to each other are provided with keyways 9, and the two flat keys 8 are respectively slidably connected in the two keyways 9.

[0061] Specifically, slider 4 slides within keyway 9 to guide the raising and lowering of active slider 5.

[0062] Preferably, the opening and closing mechanism further includes:

[0063] Two guide blocks 10, one end of which is connected to the active slider 5, and the other end of each guide block 10 is provided with a guide groove 11.

[0064] Two guide rails 12 are connected to each other on the inner side of the valve cavity, and two guide grooves 11 are slidably connected to the two guide rails 12 respectively.

[0065] Specifically, the guide block 10 slides on the guide rail 12 to guide the lifting and lowering of the opening and closing mechanism.

[0066] Preferably, the gate valve body includes:

[0067] Valve body 13;

[0068] Valve cover 14 is connected to the top of valve body 13.

[0069] Specifically, the valve body 13 and the valve cover 14 form a valve cavity inside.

[0070] Preferably, the lifting drive mechanism includes:

[0071] Valve stem 15 extends through the top of the gate valve body, and the bottom end of valve stem 15 is connected to the opening and closing mechanism.

[0072] The drive unit is connected to the top of the gate valve body, and the drive end of the drive unit is connected to the top of the valve stem 15.

[0073] Specifically, the drive unit is used to drive the valve stem 15 to move the opening and closing mechanism up and down.

[0074] As shown in Figure 4, preferably, a support body 16 is formed at the bottom of the valve cavity and below the two valve holes. The two support bodies 16 can support the two gates 1 respectively, so that the center of the gate 1 can be on the axis of the valve hole, and the bottom of the gate 1 can slide on the support body 15.

[0075] Specifically, the height of the support body 16 is designed according to the height of the valve hole to support the gate 1, so that the gate 1 can accurately seal the valve hole.

[0076] Preferably, the two valve holes are provided with annular grooves at their close ends, and the two valve seat rings 2 are respectively disposed in the two annular grooves. The flat gate valve also includes two second sealing rings 17, which are respectively connected to the surfaces of the two valve seat rings 2 that are far apart from each other, and the two second sealing rings 17 are respectively attached to the inner side of the two annular grooves.

[0077] Specifically, the second sealing ring 17 is an O-ring, which achieves the seal between the valve seat ring 2 and the ring groove.

[0078] Preferably, the surface of the valve seat ring 2 is provided with an alloy layer.

[0079] Specifically, the alloy layer is an STL alloy layer, and the alloy layer is welded onto the surface of the valve seat 3. In this way, when the flat gate valve is fully open, the alloy layer can effectively reduce the erosion of the sealing surface of the valve seat ring 2 by the medium, thereby ensuring the sealing performance.

[0080] In summary, when the flat gate valve provided by this invention is implemented, during the closing process, the lifting drive mechanism drives the opening and closing mechanism to move downward. When the bottom of the gate 1 contacts the support body 16, the active slider 5 will slide downward due to the blocking effect of the support body 16. Since the distance between the two driven sliders 4 gradually narrows from top to bottom, and the distance between the two sides of the active slider 5 gradually narrows from top to bottom, the sliding of the active slider 5 will open the two driven sliders 4. At this time, the two gates 1 will slide on the two supports 16, and the two gates 1 will move away from each other until the first sealing ring 3 on the two gates 1 contacts the two valve seat rings 2 respectively. At this time, the two gates 1 will block the two valve holes respectively, so as to realize the closing of the flat gate valve.

[0081] During the opening process of the flat gate valve, the lifting drive mechanism drives the opening and closing mechanism to move upward. At this time, the active slider 5 moves upward first. Under the retraction of multiple elastic elements 7 and the guiding action of the inclined surface, the two driven sliders 4 will move towards each other. The two gates 1 can ensure that they are separated from the two valve seat rings 2 with the minimum distance. At this time, when the two gates 1 move towards each other, they open the two valve holes respectively to realize the opening of the flat gate valve. Then, the lifting drive mechanism continues to drive the active slider 5 to move upward. At this time, the baffle 6 can support the two driven sliders 4. The entire opening and closing mechanism will be moved above the valve holes to realize the full opening of the flat gate valve.

[0082] This flat gate valve eliminates the guide hole design, and the size of the gate plate 1 does not need to be too large; it only needs to be large enough to seal the valve orifice. Consequently, the valve body no longer needs a cavity to accommodate the rise and fall of the gate plate 1, thus eliminating the lower volume of the valve body and significantly reducing the overall weight, energy consumption, and performance. Furthermore, this flat gate valve only has the gate plate 1 and the valve orifice at one end of the valve cavity touching during the moment of opening and closing; during the opening and closing process, the gate plate 1 and the valve orifice at one end of the valve cavity are separated. This reduces wear on the first seal and extends its service life.

[0083] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A flat gate valve, characterized in that, The flat gate valve includes: The gate valve body has a valve cavity inside, and valve holes communicating with the valve cavity are provided on both sides of the gate valve body; Two gates are spaced apart within the valve cavity; An opening and closing mechanism is provided, which is connected to the two gates. A lifting drive mechanism is connected to the top of the gate valve body and is connected to the opening and closing mechanism. The two gate plates can open at the valve hole position and block the two valve holes respectively when the lifting drive mechanism drives the opening and closing mechanism to descend. The two gate plates can close at the valve hole position and move away from the two valve holes respectively when the lifting drive mechanism drives the opening and closing mechanism to rise.

2. A flat gate valve according to claim 1, characterized in that, The flat gate valve also includes: Two valve seat rings are respectively connected to the inner side of the two valve holes that are close to each other. Two first sealing rings are respectively connected to the surfaces of the two gates that are far apart from each other. When the two gates respectively block the two valve holes, the two first sealing rings respectively fit with the two valve seat rings.

3. A flat gate valve according to claim 1, characterized in that, The opening and closing mechanism includes: Two driven sliders are respectively connected to the surfaces of the two gates that are close to each other. The surfaces of the two driven sliders that are close to each other are inclined surfaces. The distance between the two driven sliders gradually narrows from top to bottom. An active slider is connected at its top to the lifting drive mechanism. The active slider has inclined surfaces on both sides, and the distance between the two sides of the active slider gradually narrows from top to bottom. The active slider slides between two driven sliders. A baffle is connected to the bottom of the active slider, and the baffle can fit against the bottom of the driven slider; Multiple elastic elements are distributed between the two gates. The two ends of each elastic element are connected to the adjacent surfaces of the two gates. The adjacent surfaces of the two driven sliders can respectively adhere to the two sides of the active slider when the elastic element contracts.

4. A flat gate valve according to claim 3, characterized in that, The opening and closing mechanism also includes two flat keys, which are respectively connected to the two sides of the active slider. The surfaces of the two driven sliders that are close to each other are provided with keyways, and the two flat keys are respectively slidably connected in the two keyways.

5. A flat gate valve according to claim 3, characterized in that, The expanding and contracting mechanism also includes: Two guide blocks, one end of which is connected to the active slider, and the other end of each guide block is provided with a guide groove; Two guide rails are connected to each other inside the valve cavity, and two guide grooves are slidably connected to the two guide rails respectively.

6. A flat gate valve according to claim 1, characterized in that, The gate valve body includes: Valve body; A valve cover, which is attached to the top of the valve body.

7. A flat gate valve according to claim 1, characterized in that, The lifting drive mechanism includes: A valve stem extends through the top of the gate valve body, and the bottom end of the valve stem is connected to the opening and closing mechanism; A drive device is connected to the top of the gate valve body, and the drive end of the drive device is connected to the top of the valve stem.

8. A flat gate valve according to claim 1, characterized in that, A support is formed at the bottom of the valve chamber and below the two valve holes. The two supports can support the two gates respectively, so that the center of the gate is on the axis of the valve hole, and the bottom of the gate can slide on the support.

9. A flat gate valve according to claim 2, characterized in that, The two valve holes are provided with annular grooves at their close ends, and two valve seat rings are respectively disposed in the two annular grooves. The flat gate valve also includes two second sealing rings, which are respectively connected to the surfaces of the two valve seat rings that are far apart from each other, and the two second sealing rings are respectively attached to the inner side of the two annular grooves.

10. A flat gate valve according to claim 2, characterized in that, The surface of the valve seat ring is provided with an alloy layer.

Images