Gate valve

Abstract

Fluid channels are formed in a valve body, and valve seats are arranged on the side walls of the valve body between a first channel and a second channel of the fluid channels. The double-flashboard assembly comprises a first flashboard and a second flashboard which are movably connected together, and an elastic piece is arranged between the first flashboard and the second flashboard. The valve rod is connected with the double-gate-plate assembly and can drive the double-gate-plate assembly to move. When the double-gate plate assembly moves to be in complete sealing contact with the valve seat, a cavity is formed between the first gate plate and the second gate plate. The bypass assembly comprises a third connecting pipe and further comprises a first connecting pipe and / or a second connecting pipe; a pipeline connected with the third connecting pipe and the first connecting pipe can enable a medium in the first channel to flow into the cavity in a one-way manner; and / or a pipeline connected with the third connecting pipe and the second connecting pipe can enable the medium in the second channel to flow into the cavity in a one-way manner. Opening and closing torque of the gate valve can be effectively reduced, abrasion of a sealing face is reduced, and the service life of the gate valve is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and more particularly to a gate valve. Background Art

[0002] A gate valve is a gate that opens and closes a valve. Its movement direction is perpendicular to the direction of water flow. Its function is to cut off or connect the medium in the pipeline. It is a valve that is always in two states: closed and fully open.

[0003] CN221525595U discloses a gate valve, including a valve body, a valve plate, a valve stem and a valve handle, wherein the valve plate is located inside the valve body, and the top of the valve plate is fixed to the valve handle. The hand wheel is turned, and the hand wheel drives the valve stem nut to rotate, and the valve stem nut drives the valve stem to move upward or downward, thereby driving the valve plate to move, so as to open or close the gate valve. In order to improve the sealing effect, sealing materials such as metal materials are usually welded on the sealing surfaces of the valve body sealing seat and the valve plate to increase wear resistance, and the sealing surface is inclined, that is, as shown in the prior art solution, it is wide at the top and narrow at the bottom, and its function is that when the valve plate moves downward to close, the sealing surface is subjected to increasing force to ensure the sealing performance.

[0004] Because the sealing surface is made of welded metal, the accuracy of the matching dimensions between the valve seat and the valve plate sealing surface directly reflects the sealing performance of the gate valve. In actual production, due to the objective existence of production equipment and manufacturing errors, in order to compensate for the matching errors, a large closing pressure needs to be applied to the valve plate until the metal elastic deformation occurs between the valve seat and the valve plate sealing surface to achieve effective closing, which leads to large closing torque and large wear on the sealing surface, and fluid leakage is prone to occur after long-term operation. In addition, in order to overcome the elastic deformation caused by large torque, the wall thickness of the valve body is increased during design to reduce the impact on the valve body itself.

[0005] In summary, the existing gate valves have the following disadvantages: 1. Poor sealing performance; 2. Difficult to manufacture, especially large-diameter gate valves; 3. Thick valve body wall and high material cost; 4. Large opening and closing torque, high requirements for opening and closing actuators and easy damage, resulting in high actuator costs; 5. The overall installation height of the valve is high, occupying a large space, etc. Summary of the invention

[0006] The present invention provides a gate valve, which can reduce the opening and closing torque of the gate valve, reduce the wear of the sealing surface, improve the sealing performance, and increase the service life of the gate valve.

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] A gate valve, comprising:

[0009] A valve body, in which a fluid channel is provided, wherein the fluid channel includes a first channel and a second channel, and valve seats are provided on the side walls of the valve body adjacent to each other of the first channel and the second channel;

[0010] Also includes:

[0011] A double gate assembly, comprising a first gate and a second gate movably connected together, wherein at least one elastic member is arranged between the first gate and the second gate for applying elastic force to the first gate and the second gate;

[0012] A valve stem, one end of which is located outside the valve body, and the other end of which extends into the valve body and is connected to the double gate assembly, and is capable of driving the double gate assembly to reciprocate along the valve stem direction to correspondingly control the opening and closing of the fluid channel; when the double gate assembly moves to seal and contact with the valve seat to close the fluid channel, a chamber is formed between the first gate and the second gate;

[0013] The bypass assembly includes a third connecting pipe and also includes a first connecting pipe and / or a second connecting pipe;

[0014] The third connecting pipe is connected to the first connecting pipe, and a first check valve is arranged on the connecting pipe, through which the medium in the first channel can flow unidirectionally into the chamber; and / or, the third connecting pipe is connected to the second connecting pipe, and a second check valve is arranged on the connecting pipe, through which the medium in the second channel can flow unidirectionally into the chamber.

[0015] In this solution, an elastic member is also arranged between the first gate plate and the second gate plate to form an elastic double gate plate assembly. At the same time, a bypass assembly is connected to the valve body to allow the fluid medium to flow unidirectionally into the chamber between the first gate plate and the second gate plate, thereby having a fluid self-sealing effect, reducing the opening and closing torque of the gate valve, reducing the wear of the sealing surface, and having better sealing performance, thereby increasing the service life of the gate valve.

[0016] As a further improvement, the bypass assembly further includes a tee; the first connecting pipe is connected to the third connecting pipe via the tee, and the second connecting pipe is connected to the third connecting pipe via the tee.

[0017] As a further improvement, the elastic member includes a first elastic member and a second elastic member, and the first elastic member and the second elastic member are symmetrically arranged on both sides of the axial center line of the valve stem, so that the gate plate is subjected to consistent forces on both sides relative to the valve stem, avoiding different forces that reduce the sealing effect of the gate plate.

[0018] As a further improvement, the first gate plate and the second gate plate are arranged at an angle so that the size of the chamber between the first gate plate and the second gate plate gradually decreases in the direction away from the valve stem, so that the double gate plate assembly forms a wedge-shaped structure that is wide at the top and narrow at the bottom. When the gate valve is opened, the inclined gate plate can drain the fluid and reduce the impact of the fluid on the gate plate.

[0019] As a further improvement, the first gate plate and the second gate plate are movably connected via a hook assembly;

[0020] The hook assembly includes a first left hook and a second left hook connected to the first gate plate, and a first right hook and a second right hook connected to the second gate plate;

[0021] The first left hook is connected with the first right hook, and the second left hook is connected with the second right hook. There is a gap at the connection between the first left hook and the first right hook and at the connection between the second left hook and the second right hook, which is used to provide a space for the first gate plate and the second gate plate to move closer to or away from each other. The connection of the hook assembly is also matched with an elastic member, so that the first gate plate and the second gate plate will not be separated from each other, and the double gate plate assembly has elasticity.

[0022] As a further improvement, two of the first left hook and the first right hook are respectively provided and symmetrically located on both sides of the second left hook and the second right hook, so that a relatively stable triangle is formed between the connection between the second left hook and the second right hook and the connection between the first left hook and the first right hook.

[0023] As a further improvement, the hook opening directions of the first left hook and the second left hook are opposite, and the hook opening directions of the first right hook and the second right hook are opposite, so as to prevent the hook assembly from being disengaged when the double gate assembly moves along the valve stem.

[0024] As a further improvement, the valve stem is threadedly connected with a valve stem nut, and the valve stem nut is located between the second left hook and the second right hook and connected to the second left hook and the second right hook. The valve stem rotates, so that the valve stem nut moves along the valve stem, and the valve stem nut drives the double gate assembly to move. The valve stem nut is arranged between the second left hook and the second right hook, so that the valve stem nut sinks into the space where the double gate assembly is located, which can reduce the installation height of the gate valve, thereby reducing the space occupied by the gate valve in height.

[0025] As a further improvement, sealing surfaces are protrudingly provided at the edges of the first gate plate and the second gate plate, and the sealing surfaces are used for sealing connection with the valve seat.

[0026] As a further improvement, a valve body opening is provided on one side of the valve body, the valve body opening is covered with a valve cover, and the valve stem is arranged through the valve cover.

[0027] Other technical problems that can be solved by the gate valve of the present invention, other technical features included in the technical solution and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the main view of the gate valve;

[0029] Figure 2 for Figure 1 Cross-sectional view of the middle gate valve from the rear;

[0030] Figure 3 is a schematic diagram of the bypass component structure;

[0031] Figure 4 A schematic diagram of the connection state of the first gate plate and the second gate plate;

[0032] Figure 5 for Figure 4 Middle section view in the bottom direction;

[0033] Figure 6 It is a three-dimensional schematic diagram of the connection state of the first gate plate, the second gate plate and the valve stem;

[0034] Figure 7 A three-dimensional schematic diagram of the connection state of the first gate plate, the second gate plate and the valve stem from another angle;

[0035] Figure 8 It is a three-dimensional schematic diagram of the first gate plate, the second gate plate and the valve stem;

[0036] Fig. 9 This is a schematic diagram from another angle showing the connection state of the first gate plate and the second gate plate.

[0037] Description of labels:

[0038] 1. Valve body; 11. First channel; 12. Second channel; 13. Valve seat; 14. Valve body opening;

[0039] 2. Valve cover;

[0040] 3. Bypass assembly; 31. First connecting pipe; 32. Second connecting pipe; 33. Third connecting pipe; 34. Three-way piece; 35. First check valve; 36. Second check valve;

[0041] 41. first gate plate; 411. first left hook; 412. second left hook; 42. second gate plate; 421. first right hook; 422. second right hook; 423. sealing surface; 424. positioning groove; 43. valve stem; 431. valve stem nut; 4311. upper limit block; 4312. lower limit block; 432. actuator; 44. first elastic member; 45. second elastic member; 46. chamber;

[0042] 5. Seals. DETAILED DESCRIPTION

[0043] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0044] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0045] At the same time, the terms such as "upper", "lower", "left", "right", "middle" etc. cited in this specification are only for the convenience of description, and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to express other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0047] The gate valve is installed in the fluid medium pipeline system. The movement direction of the gate in the gate valve is perpendicular to the flow direction of the fluid inside it, and the gate is used to cut off or connect the flow of the medium in the pipeline.

[0048] Combination Figure 1-3 As shown, this embodiment provides a gate valve, including a valve body 1, a double gate assembly, a valve stem 43 and a bypass assembly 3.

[0049] The valve body 1 has a fluid channel, which includes a first channel 11 and a second channel 12. A valve seat 13 is provided on the side wall of the valve body where the first channel 11 and the second channel 12 are close to each other. The gate valve is installed in a pipeline system, the first channel 11 is connected to the pipeline, the second channel 12 is connected to the pipeline, and the fluid flows through the fluid channel. A valve body opening 14 is also provided on one side of the valve body 1, and a valve cover 2 is provided at the valve body opening 14. In order to improve the sealing performance of the valve cover 2 to the valve body opening 14, an elastic sealing ring is embedded on the side of the valve cover 2 that contacts the valve body 1 to improve the sealing performance of the valve cover 2 to the valve body opening 14.

[0050] The double gate assembly includes a first gate 41 and a second gate 42 that are movably connected together, and an elastic member is further provided between the first gate 41 and the second gate 42 for applying elastic force to the first gate 41 and the second gate 42. Preferably, the elastic member is a spring, and both ends of the spring are connected to the first gate 41 and the second gate 42, respectively.

[0051] The valve stem 43 is arranged through the valve cover 2, one end of the valve stem 43 is located outside the valve body 1, and the other end extends through the valve cover 2 into the valve body 1 to connect with the double gate assembly, and can drive the double gate assembly to reciprocate along the direction of the valve stem 43 to control the opening and closing of the fluid channel. Specifically, one end of the valve stem 43 located outside the valve body 1 is connected to the actuator 432, and the actuator 432 drives the valve stem 43 to operate, thereby driving the double gate assembly to move. The actuator 432 can be a motor or a hydraulic cylinder, etc.

[0052] When the valve stem 43 drives the double gate assembly to leave the fluid channel, the fluid channel is opened and the medium circulates. When the valve stem 43 drives the double gate assembly to move to the first channel 11 and the second channel 12 and the double gate assembly is in sealing contact with the valve seat 13, the fluid channel is closed and the medium circulation channel is cut off. In addition, when the circulation channel of the gate valve is closed, a chamber 46 is formed between the first gate 41 and the second gate 42.

[0053] When the valve stem 43 passes through the valve cover 2, in order to improve the sealing between the valve stem 43 and the valve cover 2, a sealing member 5 is sleeved on the valve stem 43 for sealing, and the sealing member 5 is located on the outside of the valve cover 2. The sealing member 5 is a sealing packing member, and the use of the sealing packing member for sealing can make the sealing between the valve stem 43 and the valve cover 2 better.

[0054] The bypass assembly 3 includes a first connecting pipe 31, a second connecting pipe 32 and a third connecting pipe 33; the first connecting pipe 31 and the third connecting pipe 33 are connected and a first check valve 35 is arranged on the connecting pipe, through which the medium in the first channel 11 can flow to the chamber 46 in one direction. The second connecting pipe 32 and the third connecting pipe 33 are connected and a second check valve 36 is arranged on the connecting pipe, through which the medium in the second channel 12 can flow to the chamber 46 in one direction. Specifically, through holes are provided on the valve body 1 for respectively connecting the first connecting pipe 31, the second connecting pipe 32 and the third connecting pipe 33. When the first check valve 35 is opened, the first channel 11 is connected to the chamber 46 through the first connecting pipe 31 and the third connecting pipe 33; when the second check valve 36 is opened, the second channel 12 is connected to the chamber 46 through the second connecting pipe 32 and the third connecting pipe 33.

[0055] In other embodiments, the bypass assembly 3 may also include only a pipeline formed by the first connecting pipe 31 and the third connecting pipe 33, the connecting pipe is provided with a first check valve 35, and the medium in the first channel 11 can flow unidirectionally to the chamber 46. Alternatively, the bypass assembly 3 may include only a pipeline formed by the second connecting pipe 32 and the third connecting pipe 33, the connecting pipe is provided with a second check valve 36, and the medium in the second channel 12 can flow unidirectionally to the chamber 46.

[0056] It should be noted that in other cases, describing the check valve as a non-return valve or a one-way valve is within the protection scope of the present application.

[0057] The gate valve in this embodiment is explained by assuming that the medium in the gate valve enters through the first channel 11 and flows out through the second channel 12. In this embodiment, the first gate plate 41 and the second gate plate 42 are movably connected, and an elastic member is also arranged between the first gate plate 41 and the second gate plate 42, so that an elastic double gate plate assembly is formed between the first gate plate 41 and the second gate plate 42. When the gate valve is cut off and sealed, the elastic force applied to the first gate plate 41 and the second gate plate 42 by the elastic member makes the double gate plate assembly close to the valve seat 13, thereby sealing. Therefore, during the opening and closing process of the gate valve, when the double gate plate assembly moves to contact the valve seat 13, the valve seat 13 squeezes the first gate plate 41 and the second gate plate 42 respectively, and there is a movable space between the first gate plate 41 and the second gate plate 42. At this time, the first gate plate 41 and the second gate plate 42 squeeze the elastic member at the same time, and the elastic member applies elastic force to the first gate plate 41 and the second gate plate 42 respectively. After the double gate assembly contacts the valve seat 13, the friction between the two is generated due to the elastic force on the gate, so that the friction is small, and the opening and closing torque of the double gate assembly driven by the valve stem 43 only needs to overcome the friction, and the double gate assembly does not need to overcome the elastic deformation of the sealing surface during movement, thereby reducing the opening and closing torque of the gate valve. In addition, since the friction between the double gate assembly and the valve seat 13 is reduced, the wear of the sealing surface is effectively reduced, and the service life of the gate valve is increased.

[0058] When the double gate assembly closes the gate valve under the action of the valve stem 43, the first gate 41 and the second gate 42 cooperate with the valve seat 13 to seal, and the fluid in the first channel 11 enters the chamber 46 through the first connecting pipe 31 and the third connecting pipe 33, thereby forming a fluid pressure balance, forming a fluid pressure self-sealing effect on the double gate assembly, and improving the sealing effect. For the first gate 41, the fluid pressure on both sides of the first gate 41 is balanced. Specifically, the side of the first gate 41 close to the first channel 11 is the side A, and the side close to the chamber 46 is the side B. The fluid pressure on the side A and the side B of the first gate 41 is consistent. At this time, the first gate 41 is sealed by the elastic force applied thereto. For the second gate 42, the fluid pressure can form a self-sealing effect of the fluid pressure, and at the same time, the second gate 42 is also subjected to the elastic force, so that the second gate 42 has a better sealing effect.

[0059] It should be noted that, in other embodiments, the medium in the gate valve may also enter through the second channel 12 and flow out through the first channel 11. In this case, when the gate valve is closed, the fluid in the second channel 12 enters the chamber 46 through the second connecting pipe 32 and the third connecting pipe 33, and the fluid pressure on both sides of the second gate plate 42 is balanced. The second gate plate 42 is sealed by the elastic force applied thereto, and the first gate plate 41 is sealed by both the fluid pressure and the elastic force.

[0060] In this embodiment, the valve seat 13 is formed by surfacing metal or inlaying a metal sleeve on the valve body 1, and a sealing surface 423 is protrudingly provided at the edge of the first gate plate 41 and the second gate plate 42, and the sealing surface 423 is used to seal and connect with the valve seat 13. The elastic double gate assembly is adopted, and the requirements for the production and processing accuracy of the sealing surface 423 and the relative size between the two valve seats 13 are low. The double gate assembly can still maintain the matching with the valve seat 13 through its own elastic force, so that the gate plate has strong adaptability and mutual compatibility, making the gate plate more adaptable to batch production lines. In addition, due to the good adaptability of the double gate assembly, it is not easy to be affected by the elastic deformation of the valve body 1 and the valve seat 13 due to the fluid pressure, so that the wall thickness of the valve body 1 and the valve cover 2 does not need to be thickened, which effectively reduces the material cost. Moreover, due to the light opening and closing torque, the torque requirement of the opening and closing actuator 432 is greatly reduced, making it easier to select the actuator 432 with small size and low cost, and easier to integrate with the valve body.

[0061] Combination Figure 3 As shown, the bypass assembly 3 further includes a tee piece 34. The first connecting pipe 31 is connected to the third connecting pipe 33 through the tee piece 34, and the second connecting pipe 32 is connected to the third connecting pipe 33 through the tee piece 34.

[0062] Combination Figure 4 and Figure 5 As shown, the elastic member includes a first elastic member 44 and a second elastic member 45, and the first elastic member 44 and the second elastic member 45 are symmetrically arranged on both sides of the axial center line of the valve stem 43, so that the gate plate is subjected to the same force on both sides of the valve stem 43, thereby avoiding the different forces that reduce the sealing effect of the gate plate. In other embodiments, the elastic members can also be provided in other numbers, without limitation.

[0063] by Figure 2 The middle view shows that the first gate plate 41 and the second gate plate 42 are tilted so that the size of the chamber 46 between the first gate plate 41 and the second gate plate 42 gradually decreases in the direction away from the valve stem 43, and the double gate plate assembly forms a wedge-shaped structure that is wide at the top and narrow at the bottom. When the gate valve is opened, the tilted gate plate can drain the fluid and reduce the impact of the fluid on the gate plate. In addition, due to the use of an elastic double gate plate assembly, the accuracy of the gate plate tilt angle is reduced, and the sealing surface of the double gate plate assembly can always remain in contact with the valve seat under the action of the elastic member, thereby improving the sealing reliability of the gate plate.

[0064] Combination Figure 4-9As shown, the first gate plate 41 and the second gate plate 42 are movably connected through a hook assembly. The hook assembly includes a first left hook 411 and a second left hook 412 connected to the first gate plate 41, and a first right hook 421 and a second right hook 422 connected to the second gate plate 42. The first left hook 411 and the first right hook 421 are matched and connected, and the second left hook 412 and the second right hook 422 are matched and connected, and there is a gap at the matching connection between the first left hook 411 and the first right hook 421 and the matching connection between the second left hook 412 and the second right hook 422, which is used to provide a space for the first gate plate 41 and the second gate plate 42 to move closer to or away from each other. Specifically, when the first gate plate 41 and the second gate plate 42 move between the two valve seats 13, due to the setting of the gap there, the first gate plate 41 and the second gate plate 42 are squeezed to move closer to each other; when the first gate plate 41 and the second gate plate 42 leave the valve seat 13, under the action of the elastic member, the first gate plate 41 and the second gate plate 42 can move closer to each other. Since the hook assembly is connected with the elastic member at the same time, the first gate plate 41 and the second gate plate 42 will not be separated from each other, and the double gate plate assembly has elasticity.

[0065] As a preferred embodiment, two first left hooks 411 and two first right hooks 421 are respectively provided and symmetrically located on both sides of the second left hook 412 and the second right hook 422, so that a relatively stable triangle is formed between the connection between the second left hook 412 and the second right hook 422 and the connection between the first left hook 411 and the first right hook 421. Moreover, the hook opening directions of the first left hook 411 and the second left hook 412 are opposite, and the hook opening directions of the first right hook 421 and the second right hook 422 are opposite, so as to prevent the hook assembly from being disengaged when the double gate assembly moves along the valve stem 43.

[0066] Combination Figure 4 , Figure 8 and Fig. 9 As shown, the valve stem 43 is threadedly connected to the valve stem 43, and the valve stem nut 431 is located between the second left hook 412 and the second right hook 422 and connected to the second left hook 412 and the second right hook 422. The actuator 432 drives the valve stem 43 to rotate, so that the valve stem nut 431 moves along the valve stem 43, and the valve stem nut 431 drives the double gate assembly to move. The valve stem nut 431 is set between the second left hook 412 and the second right hook 422, so that the valve stem nut 431 is sunk into the space where the double gate assembly is located, which can reduce the setting height of the gate valve, thereby reducing the space occupied by the gate valve in height. In addition, due to the reduction of the distortion of the gate valve when opening and closing, a small actuator can be selected, thereby further reducing the overall height of the gate valve.

[0067] The valve stem nut 431 is located between the second left hook 412 and the second right hook 422. A waist-shaped hole is formed between the second left hook 412 and the second right hook 422 to provide a moving space for the first gate plate 41 and the second gate plate 42 to move closer to or away from each other. An upper limit block 4311 and a lower limit block 4312 are also prominently provided on the valve stem nut 431. The upper limit block 4311 and the lower limit block 4312 are respectively located on both sides of the second left hook 412 and the second right hook 422. The upper limit block 4311 and the lower limit block 4312 limit and clamp the second left hook 412 and the second right hook 422, so that when the valve stem nut 431 moves, it can drive the double gate assembly to move synchronously. On one side close to the lower limit block 4312, a positioning groove 424 is recessed on the second left hook 412 and the second right hook 422, and the lower limit block 4312 is matched and arranged in the positioning groove 424. At the same time, the lower limit block 4312 and the positioning groove 424 are polygonal, for example Figure 8 The lower limit block 4312 is in the quadrilateral shape shown in the figure, and after the lower limit block 4312 is matched and connected with the positioning groove 424, the valve stem nut 431 is limited to prevent the valve stem nut 431 from rotating with the valve stem 43. In other embodiments, the positioning groove 424 can also be opened on the second left hook 412 and the second right hook 422 on one side close to the upper limit block 4311, and the upper limit block 4311 is matched and connected with the positioning groove 424, and the upper limit block 4311 and the positioning groove 424 are set to a polygon.

[0068] The gate valve in this solution adopts an elastic double gate assembly and cooperates with the bypass assembly 3 to form a fluid self-seal, thereby reducing the opening and closing torque of the gate valve, reducing the wear of the sealing surface, and improving the sealing performance, thereby increasing the service life of the gate valve.

[0069] The terms "installed", "set", "provided with", and "connected" referred to herein should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A gate valve, comprising: A valve body (1) having a fluid channel therein, wherein the fluid channel comprises a first channel (11) and a second channel (12), and valve seats (13) are provided on the side walls of the valve body adjacent to each other of the first channel (11) and the second channel (12); It is characterized by further comprising: A double gate assembly comprises a first gate (41) and a second gate (42) movably connected together, wherein at least one elastic member is arranged between the first gate (41) and the second gate (42) for applying elastic force to the first gate (41) and the second gate (42); a valve stem (43), one end of which is located outside the valve body (1), and the other end of which extends into the valve body (1) and is connected to the double gate assembly, and is capable of driving the double gate assembly to reciprocate along the direction of the valve stem (43) to correspondingly control the opening and closing of the fluid channel; when the double gate assembly moves to seal contact with the valve seat (13) to close the fluid channel, a chamber (46) is formed between the first gate (41) and the second gate (42); A bypass assembly (3), comprising a third connecting pipe (33), and further comprising a first connecting pipe (31) and / or a second connecting pipe (32); The third connecting pipe (33) is connected to the first connecting pipe (31), and a first check valve (35) is arranged on the connecting pipe, through which the medium in the first channel (11) can flow unidirectionally into the chamber (46); and / or the third connecting pipe (33) is connected to the second connecting pipe (32), and a second check valve (36) is arranged on the connecting pipe, through which the medium in the second channel (12) can flow unidirectionally into the chamber (46).

2. The gate valve according to claim 1, characterized in that: The bypass assembly (3) further comprises a tee piece (34); the first connecting pipe (31) is connected to the third connecting pipe (33) via the tee piece (34), and the second connecting pipe (32) is connected to the third connecting pipe (33) via the tee piece (34).

3. The gate valve according to claim 1 or 2, characterized in that: The elastic member comprises a first elastic member (44) and a second elastic member (45), and the first elastic member (44) and the second elastic member (45) are symmetrically arranged on both sides of the axial center line of the valve stem (43).

4. The gate valve according to claim 3, characterized in that: The first gate plate (41) and the second gate plate (42) are arranged obliquely, so that the size of the chamber (46) between the first gate plate (41) and the second gate plate (42) gradually decreases in a direction away from the valve stem (43).

5. The gate valve according to claim 1, characterized in that: The first gate plate (41) and the second gate plate (42) are movably connected via a hook assembly; The hook assembly comprises a first left hook (411) and a second left hook (412) connected to the first gate plate (41), and a first right hook (421) and a second right hook (422) connected to the second gate plate (42); The first left hook (411) and the first right hook (421) are connected in a matching manner, and the second left hook (412) and the second right hook (422) are connected in a matching manner.

6. The gate valve according to claim 5, characterized in that: Two of the first left hook (411) and the first right hook (421) are respectively provided and are symmetrically located on both sides of the second left hook (412) and the second right hook (422).

7. The gate valve according to claim 5, characterized in that: The hook opening directions of the first left hook (411) and the second left hook (412) are opposite, and the hook opening directions of the first right hook (421) and the second right hook (422) are opposite.

8. The gate valve according to claim 7, characterized in that: The valve stem (43) is threadedly connected to a valve stem nut (431), and the valve stem nut (431) is located between the second left hook (412) and the second right hook (422) and is connected to the second left hook (412) and the second right hook (422).

9. The gate valve according to claim 4, characterized in that: Sealing surfaces (423) are protrudingly provided at the edges of the first gate plate (41) and the second gate plate (42), and the sealing surfaces (423) are used for sealing connection with the valve seat (13).

10. The gate valve according to claim 1, characterized in that: A valve body opening (14) is provided on one side of the valve body (1), the valve body opening (14) is covered with a valve cover (2), and the valve stem (43) is arranged through the valve cover (2).

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