Sand prevention flat gate valve

Abstract

The invention relates to a sand prevention flat gate valve which comprises a valve plate assembly and two integral valve seats, and the two integral valve seats are attached to the two side faces of the valve plate assembly correspondingly. The integral valve seat is an integral valve seat with a baffle, the baffle faces the valve plate assembly, the integral valve seat is embedded into the fluid channel of the valve body, and one side of the baffle is attached to the valve plate assembly. According to the sand prevention flat gate valve provided by the embodiment of the invention, in the production process of a sand-containing oil and gas well or in the scene that a large amount of sand mixing liquid passes through the flat gate valve like shale gas fracturing, sand grains can be effectively prevented from entering the valve cavity in the opening and closing process of the valve plate assembly, and the sand grains are prevented from being deposited and deposited in the valve cavity; therefore, the sand prevention device for the flat gate valve has the advantages that the effective sand prevention effect is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling, in particular to a sand-proof flat gate valve. BACKGROUND

[0002] The flat valve is an important functional component in the oil wellhead equipment, which plays a role in connecting or cutting off the fluid passage. Please refer to Figure 1 , the center of the flat valve in the horizontal direction is provided with a fluid passage 101 for facilitating the fluid to pass through, and a valve plate 102 is arranged in the vertical direction, and the valve plate 102 is provided with a through hole 103 corresponding to the fluid passage 101. The inside of the valve body is a cavity, i.e. a valve cavity 104, when the flat valve is in a connected state, rotating the hand wheel 105 or valve rod connected with the valve plate 102 can drive the valve plate 102 to move downward and make the valve plate 102 gradually descend, so that the through hole 103 is misaligned with the fluid passage 101, so as to achieve the effect of cutting off the fluid passage 101.

[0003] In the oil and gas exploitation operation, the fluid containing sand with different particle sizes is often carried through the valve, especially in the scene similar to shale gas fracturing, a large amount of mixed sand liquid is more likely to pass through the valve. Please refer to Figure 2 , in the process of driving the valve plate 102 to descend to cut off the fluid passage 101 of the flat valve, the sand particles 106 mixed in the fluid will enter the valve cavity 104 in the valve body with the sinking of the valve plate 102. When the sand particles 106 inside the valve cavity 104 are accumulated, the sinkable space of the valve plate 102 will be reduced, so that the through hole 103 of the valve plate 102 cannot be completely misaligned with the fluid passage 101, i.e. cannot completely cut off the fluid passage 101, which affects the normal closing of the flat valve.

[0004] When the flat valve is installed and operated, there may be various installation states, such as side laying, horizontal laying or upside down laying. The sand particles in the valve cavity 104 will affect the normal work of the flat valve, which may cause the opening and closing to be blocked, and also may cause the operating torque to increase and other influences.

[0005] In some prior art, please refer to Figure 3 , a small split valve seat 107 is arranged on both sides of the valve plate 102 in the valve body, a guard plate 108 adjacent to the valve plate 102 is arranged on the small split valve seat 107, and the sand particles 106 are blocked by the guard plate 108 to prevent the sand particles 106 from entering the valve cavity 104. However, since the side of the guard plate 108 away from the valve plate 102 is not supported, and the fluid flowing through the flat valve has a certain pressure and flow rate, the flowing fluid is easy to push the guard plate 108 away from the valve plate 102, and then carry the sand particles 106 into the valve cavity 104, resulting in the retention of the sand particles 106. SUMMARY

[0006] The application provides a sand-proof flat gate valve to solve the problem that sand particles easily enter the valve cavity through the through hole of the valve plate and accumulate in the valve cavity when the flat gate valve is closed or opened, thereby causing the existing problems of the flat gate valve, such as the failure of the opening and closing of the flat gate valve, the jamming of the opening and closing of the flat gate valve, and the large opening and closing torque of the flat gate valve.

[0007] In a first aspect, the application provides a sand-proof flat gate valve, comprising a valve plate assembly and two integral valve seats, the two integral valve seats being respectively attached to the two side surfaces of the valve plate assembly.

[0008] The integral valve seat is an integral structure with a baffle, the baffle faces the valve plate assembly, the integral valve seat is embedded in the fluid passage of the valve body, and one side of the baffle is attached to the valve plate assembly.

[0009] Further, the valve plate assembly comprises two groups of valve plates and a spring, the spring is arranged between the two groups of valve plates, and the two groups of valve plates are movably attached.

[0010] Further, the valve plate assembly is provided with a first through hole corresponding to the fluid passage.

[0011] Further, an embedded valve core is arranged in the first through hole, O-ring grooves are arranged on the outer diameter of the embedded valve core and the attachment positions of the two groups of valve plates, respectively, valve core sealing rings are arranged in the O-ring grooves, and the valve core sealing rings fill the gap between the inner diameter of the embedded valve core and the first through hole of the two groups of valve plates.

[0012] Further, the valve body is provided with an integral valve seat hole corresponding to the integral valve seat, and the integral valve seat is embedded in the integral valve seat hole.

[0013] Further, a wave spring is arranged between the end surface of the integral valve seat and the side wall of the integral valve seat hole.

[0014] Further, a valve seat sealing ring is arranged on the integral valve seat.

[0015] Further, the bottom of the baffle of the integral valve seat extends to the bottom of the valve cavity, and the gap distance between the bottom of the baffle and the bottom of the valve cavity is 1-5 mm.

[0016] Further, the integral valve seat is provided with a second through hole, the second through hole penetrates through the integral valve seat and communicates with the fluid passage, and the axis of the second through hole is collinear with the axis of the fluid passage.

[0017] Further, the application also comprises a hand wheel and a valve rod, the top of the valve rod is connected and fixed with the central shaft of the hand wheel, a rotating sleeve is arranged on the valve rod in a threaded connection manner, the valve plate assembly is provided with a T-shaped groove corresponding to the rotating sleeve, and the rotating sleeve is matched with the T-shaped groove of the valve plate assembly.

[0018] The above technical solution provided by the embodiments of the present application has the following advantages compared with the prior art.

[0019] In the production process of the sand-containing oil and gas well, or in the scenario where a large amount of sand mixing fluid passes through the flat gate valve, such as shale gas fracturing, the sand particles can be effectively prevented from entering the valve cavity during the opening and closing of the valve plate assembly, and the sand particles can be prevented from being deposited in the valve cavity, thereby avoiding problems such as the opening and closing blockage of the flat gate valve or the failure of the flat gate valve to open and close to the position, and achieving effective sand prevention effect.

[0020] Among them:

[0021] 1. The first through hole of the valve plate assembly is effectively covered by the baffle of the integral valve seat during the opening and closing process, so that the fluid is prevented from sending sand particles into the valve cavity, and the valve cavity is ensured to be free of sand particle deposition, and the opening and closing state of the valve is ensured to be unaffected;

[0022] 2. The valve plate assembly is of a split structure, and the valve plate is moved to the direction of the two integral valve seats by the spring, so that the valve plate is tightly attached to the integral valve seat;

[0023] 3. The inner-embedded valve core is in a floating state, that is, even if the two valve plates are attached together, the end face of the inner-embedded valve core has a gap, so that in the presence of pressure in the fluid passage, the valve plate can be pushed to attach to the integral valve seat by the fluid pressure, and the gap is avoided;

[0024] 4. When the gap between the two integral valve seats increases, the valve plate is pushed by the double forces of the internal spring and the fluid pressure, and is automatically attached to the integral valve seat, so as to compensate for the gap between the integral valve seat and the valve plate, and avoid the gap allowing sand particles to fall into the valve cavity. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments in accordance with the present application, and together with the description, serve to explain the principles of the application.

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying creative labor.

[0027] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings, and these exemplary illustrations do not constitute a limitation on the embodiments, and the elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, and the drawings do not constitute a proportional limitation.

[0028] Figure 1A structure diagram of a flat valve in a conducting state in the prior art.

[0029] Figure 2 A structure diagram of a flat valve in a switching process in the prior art.

[0030] Figure 3 A structure diagram of a flat valve provided with a small-part valve seat and a guard plate in the prior art.

[0031] Figure 4 A structure diagram of a sand-proof flat gate valve in an open state provided by an embodiment of the application.

[0032] Figure 5 A structure diagram of a sand-proof flat gate valve in a closed state provided by an embodiment of the application.

[0033] Figure 6 A structure diagram of a valve plate assembly in an open position.

[0034] Figure 7 A structure diagram of a valve plate assembly in an open or closing process.

[0035] Figure 8 A structure diagram of a valve plate assembly in a closed position.

[0036] Figure 9 A front view of a valve plate assembly.

[0037] Figure 10 A structure diagram of a spring of a valve plate assembly.

[0038] Figure 11 A structure diagram of two groups of valve plates in contact.

[0039] Figure 12 A structure diagram of two groups of valve plates in contact with an overall valve seat under the pushing of a spring.

[0040] Figure 13 A sectional view of a valve plate assembly.

[0041] Figure 14 A structure diagram of Figure 13 A local enlarged diagram of A in the middle.

[0042] Explanation of reference signs:

[0043] 101, fluid passage; 102, valve plate; 103, through hole; 104, valve cavity; 105, hand wheel; 106, sand particle; 107, small-part valve seat; 108, guard plate.

[0044] 1. Valve plate assembly; 11. Valve plate; 111. O-ring groove; 112. T-shaped groove; 12. Spring; 13. First through hole; 14. Inner valve core; 15. Valve core sealing ring;

[0045] 2. Integral valve seat; 21. Baffle; 22. Second through hole; 23. Valve seat sealing ring; 24. Wave spring;

[0046] 3. Valve body; 31. Fluid passage; 32. Valve cavity; 33. Integral valve seat hole; 34. Hand wheel; 35. Valve rod; 36. Rotating sleeve; 361. T-shaped head 361. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0048] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of particular examples in the following description will be described with reference to specific arrangements. It will be clear, however, that this is merely an example and is not intended to limit the application. Furthermore, the present application can refer back to a reference number and / or letter in different examples. Such repetition is for the purpose of simplicity and clarity and does not indicate a relationship between the various embodiments and / or settings being discussed.

[0049] For the purpose of description, spatial relative terms as shown in the drawings, such as "inner", "outer", "inward", "outward", "lower", "below", "upper", "above", "front", "back", etc., can be used to describe the relative position relationship or movement of one element or feature with respect to another element or feature. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "below" or "under" another element or feature will be subsequently oriented as "above" or "over" the other element or feature. Therefore, the example term "below" can include both upward and downward positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0050] In order to solve the existing technology problem that sand particles easily enter the valve cavity along the through hole of the valve plate to accumulate when closing or opening the flat plate valve, and further cause the existing technology problems that the opening and closing of the flat plate valve cannot be in place or stuck, the opening and closing torque is large, etc., the application provides a sand prevention flat plate gate valve, which can realize the lamination of the overall valve seat and the valve plate assembly, thereby providing effective covering effect for any working position of the valve plate assembly, thereby avoiding the sand particles carried by the fluid from entering the bottom valve cavity through the gap between the valve plate assembly and the overall valve seat.

[0051] Please refer to Figure 4 , Figure 5 The sand prevention flat plate gate valve provided by the application embodiment comprises a valve plate assembly 1 and two overall valve seats 2, and the two overall valve seats 2 are laminated on the two side surfaces of the valve plate assembly 1.

[0052] The overall valve seat 2 is an overall structure with a baffle 21, the baffle 21 faces the valve plate assembly 1, the overall valve seat 2 is embedded in the fluid passage 31 of the valve body 3, and one side of the baffle 21 is laminated with the valve plate assembly 1.

[0053] Please refer to Figure 6 When the flat plate gate valve is in the open state, the valve plate assembly 1 is in the upper limit position, so that the fluid passages 31 on both sides of the valve body 3 are conducted, at this time, the fluid can flow from one end to the other end of the flat plate gate valve through the fluid passage 31, realizing the transportation of the fluid. Please refer to Figure 7 During the closing process of the flat plate gate valve, the valve plate assembly 1 moves downward relative to the valve body 3 and gradually enters the valve cavity 32, at this time, the passage between the fluid passages 31 on both sides of the valve body 3 gradually decreases, and part of the fluid remains in the valve plate assembly 1 during this process. Please refer to Figure 8 When the flat plate gate valve is completely closed, the fluid passages 31 on both sides of the valve body 3 are completely cut off by the valve plate assembly 1, and the fluid cannot flow from one end to the other end of the flat plate gate valve, and the valve plate assembly 1 carries part of the fluid to move into the valve cavity 32.

[0054] Because the two side surfaces of the baffle 21 of the overall valve seat 2 are supported by the valve plate assembly 1 and the valve cavity 32 respectively, even if affected by the pressure of the fluid, it is difficult to push the baffle 21 to cause a gap between the baffle 21 and the valve plate assembly 1, thereby avoiding the problem that the fluid carrying sand particles enters the bottom valve cavity 32 to cause sand particles to accumulate and deposit, meeting the sand prevention effect and effectively ensuring the normal opening and closing state of the flat plate gate valve.

[0055] Specifically, during the switching process of the valve plate assembly 1, part of the fluid carrying sand particles remains in the valve plate assembly 1 and moves along with the valve plate assembly 1. Since the fluid will exert a certain pressure on the baffles 21 on the two sides of the overall valve seat 2, a dynamic trend of pushing the baffles 21 outward will be generated. However, since the overall valve seat 2 and the baffles 21 are of an integrated structure, the connection state between the baffles 21 and the overall valve seat 2 is stable, thereby forming a supporting force to avoid the baffles 21 from being deviated due to the pushing force of the fluid, and further avoid the formation of a gap between the baffles 21 and the valve plate assembly 1 that can allow the fluid to pass through, thereby achieving an effective sand prevention effect and avoiding the sand particles from being deposited in the valve cavity 32, so as to ensure the normal movement of the valve plate assembly 1 and the stability of the switching work of the flat gate valve.

[0056] In some embodiments, referring to Figure 9 , Figure 10 , the valve plate assembly 1 comprises two groups of valve plates 11 and a spring 12 arranged between the two groups of valve plates 11, and the two groups of valve plates 11 are movably attached. Referring to Figure 11 , Figure 12 , during the working process, under the elastic action of the spring 12, the spring 12 will continuously generate a pushing force towards the two groups of valve plates 11, so that the two groups of valve plates 11 are tightly attached to the baffles 21 of the two overall valve seats 2, respectively, thereby reducing the gap between the baffles 21 and the valve plates 11, so that during the switching process of the flat gate valve by the valve plate assembly 1, the fluid remaining in the valve plate assembly 1 is not easy to enter the valve cavity 32 through the gap between the baffles 21 and the valve plates 11, thereby avoiding the sand particles from entering the valve cavity 32 along with the fluid and being deposited, and further avoiding the situation that the flat gate valve cannot be normally closed and the fluid passage 31 is blocked. In Figure 11 , in order to distinguish the structures of the two groups of valve plates 11, a certain gap is left between the two groups of valve plates 11, but in the embodiments, the two groups of valve plates 11 are in a tightly attached state and generally no gap exists.

[0057] In some embodiments, the valve plate assembly 1 is provided with a first through hole 13 corresponding to the fluid passage 31, so that when the flat gate valve is in an open state, the first through hole 13 can be connected with the fluid passage 31, and the fluid can pass through the first through hole 13 and be sent to the other end of the flat gate valve. When the valve plate assembly 1 moves towards the valve cavity 32, i.e. the flat gate valve is closed, the first through hole 13 gradually deviates from the fluid passage 31 until the first through hole 13 is completely misaligned with the fluid passage 31, thereby achieving the blocking of the fluid passage 31.

[0058] In some embodiments, referring to Figure 13 , Figure 14The first through hole 13 is provided with an embedded valve core 14. The outer diameter of the embedded valve core 14 is provided with an O-ring groove 111 at the joint with the two sets of valve plates 11. The O-ring groove is sleeved with a valve core sealing ring 15. The valve core sealing ring 15 fills the gap between the outer diameter of the embedded valve core 14 and the first through hole 13 of the two sets of valve plates 11 to form an effective seal. Due to the elastic effect of the spring 12, the two sets of valve plates 11 are continuously pushed outwards, so that the valve plates 11 are tightly attached to the baffle 21 of the overall valve seat 2. However, in this process, there is a gap between the two sets of valve plates 11, which can easily cause the fluid to carry sand particles into the valve cavity 32 through the gap between the valve plates 11. Therefore, in this application, the embedded valve core 14 is arranged in the first through hole 13, and the O-ring groove 111 and the valve core sealing ring 15 are arranged between the embedded valve core 14 and the two sets of valve plates 11. The gap between the embedded valve core 14 and the valve plates 11 is sealed by the valve core sealing ring 15, which plays a good sealing role.

[0059] The two sets of valve plates 11 are provided with stepped holes corresponding to the position of the embedded valve core 14. The distance between the inner end faces of the stepped holes of the two sets of valve plates 11 is greater than the length of the embedded valve core 14. Therefore, there is always a gap in one or both directions between the embedded valve core 14 and the two sets of valve plates 11. When the fluid flows into the first through hole 13, it will flow into the gap between the embedded valve core 14 and the valve plates 11 and exert a corresponding fluid pressure in the gap. Under the action of fluid pressure, the two sets of valve plates 11 tend to move apart to the two sides, so that the valve plates 11 move towards the overall valve seat 2 and tightly attach to the overall valve seat 2, preventing the fluid from carrying sand particles through the gap between the valve plates 11 and the baffle 21 into the valve cavity 32.

[0060] In some embodiments, the hole diameter of the first through hole 13 is the same as the hole diameter of the fluid passage 31, so that when the first through hole 13 and the fluid passage 31 are communicated, the flow rate of the fluid will not change due to the change of the pipe diameter, effectively ensuring that the transport efficiency of the fluid is not affected, and avoiding the disturbance of the fluid flow state caused by the change of the flow rate.

[0061] In some embodiments, please refer to Figure 4 , Figure 5The valve body 3 is provided with a whole valve seat hole 33 corresponding to the whole valve seat 2, and the whole valve seat 2 is embedded in the whole valve seat hole 33. The whole valve seat 2 is provided with a second through hole 22 penetrating through the whole valve seat 2 and the baffle 21 and communicating with the fluid channel 31, and the axis of the second through hole 22 is collinear with the axis of the fluid channel 31. By embedding the whole valve seat 2 in the whole valve seat hole 33, the whole valve seat 2 is supported, the communication between the second through hole 22 and the fluid channel 31 is ensured, and the aperture of the second through hole 22 and the fluid channel 31 is the same, so that the change of the flow rate of the fluid caused by the change of the aperture is avoided, and the flow state of the fluid is disturbed.

[0062] In some embodiments, a wave spring 24 is arranged between the end surface of the whole valve seat 2 and the side wall of the whole valve seat hole 33. The wave spring 24 is a metal sheet ring composed of a plurality of wave-shaped elastic elements, which can accumulate elastic potential energy when pressed and form a reaction force by converting the elastic potential energy into kinetic energy to push or buffer. In the embodiments provided in the present application, the wave spring 24 is arranged between the end surface of the whole valve seat 2 and the side wall of the whole valve seat hole 33, so that the whole valve seat 2 is pushed towards the valve plate assembly 1 by the elastic action of the wave spring 24, so that the baffle 21 is always in close contact with the valve plate assembly 1, so as to avoid the gap between the baffle 21 and the valve plate assembly 1.

[0063] In some embodiments, the whole valve seat 2 is provided with a valve seat sealing ring 23. When the valve seat sealing ring 23 is arranged on the whole valve seat 2, and the whole valve seat 2 is embedded in the whole valve seat hole 33 of the valve body 3, the valve seat sealing ring 23 is extruded by the inside of the whole valve seat hole 33 and the whole valve seat 2, so that the gap between the whole valve seat 2 and the whole valve seat hole 33 is filled by the deformation of the valve seat sealing ring 23, so as to realize sealing, avoid the fluid flowing into the valve cavity 32 through the gap between the whole valve seat 2 and the whole valve seat hole 33, and avoid the sand accumulating in the valve cavity 32.

[0064] In some embodiments, the bottom of the baffle 21 extends to the bottom of the valve cavity 32, and the gap distance between the bottom of the baffle 21 and the bottom of the valve cavity is 1-5 mm. Since the distance between the first through hole 13 of the valve plate assembly 1 and the bottom surface of the valve cavity is greater than 5 mm, the movement of the valve plate assembly 1 is effectively protected, and the first through hole 13 of the valve plate assembly 1 can be completely covered by the baffle 21, so that the fluid in the first through hole 13 carrying sand grains enters the lower valve cavity 32 along the uncovered area of the baffle 21.

[0065] In some embodiments, the application also includes a hand wheel 34 and a valve rod 35, the top of which is fixedly connected with the central shaft of the hand wheel 34, and a rotating sleeve 36 is threadedly connected on the valve rod 35. The valve plate assembly 1 is provided with a T-shaped groove 112 corresponding to the rotating sleeve 36, and the rotating sleeve 36 is matched with the T-shaped groove 112 of the valve plate assembly 1. When the operator rotates the hand wheel 34, the valve rod 35 and the rotating sleeve 36 are threadedly engaged and driven, so as to drive the rotating sleeve 36 to move up or down along the valve rod 35. Since the rotating sleeve 36 is rotatably connected with the valve plate assembly 1, during the process that the valve rod 35 drives the rotating sleeve 36 to move up and down through engagement and transmission, the valve plate assembly 1 is synchronously moved, and the opening and closing state of the flat gate valve is controlled through the valve plate assembly 1.

[0066] In some optional embodiments, the bottom of the rotating sleeve 36 is provided with a T-shaped head 361, and the two groups of valve plates 11 of the valve plate assembly 1 are provided with T-shaped grooves 112 corresponding to the T-shaped head 361, and the T-shaped head 361 is embedded in the T-shaped groove 112. The relative position between the rotating sleeve 36 and the valve plate assembly 1 can be limited by the T-shaped head 361, and the rotation state of the rotating sleeve 36 is not affected. Therefore, when the hand wheel 34 drives the rotating sleeve 36 to rotate through the valve rod 35, so that the rotating sleeve 36 tends to move upward or downward through the engagement and transmission between the valve rod 35 and the rotating sleeve 36, the T-shaped head 361 contacts the lower wall or the upper wall of the T-shaped groove 112, thereby exerting a corresponding pushing force on the valve plate assembly 1, driving the valve plate assembly 1 to move up and down, and meeting the requirement of converting the rotation of the hand wheel 34 into the up and down movement of the valve plate assembly 1.

[0067] In some optional embodiments, the rotating sleeve 36 and the T-shaped head 361 adopt a square nut, which has a square shape and can be embedded in the T-shaped groove 112. The square nut is threadedly connected with the valve rod 35 through the internal thread in the center of the square nut, so as to facilitate the transmission between the square nut and the valve rod through threads by rotating the hand wheel 34, and the up and down movement of the valve plate assembly 1 is driven by pushing the upper and lower sidewalls of the T-shaped groove through the square nut.

[0068] In the production process of sand-containing oil and gas wells, or in the scene of similar shale gas fracturing, a large amount of sand slurry passes through the flat gate valve, which can effectively prevent the sand particles from entering the valve cavity during the opening and closing of the valve plate assembly, avoid the sand particles from being deposited in the valve cavity, cause the flat gate valve to be stuck or unable to open and close to the position, or even fail, thereby achieving effective sand prevention effect.

[0069] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0070] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0071] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0072] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be connected, or detachable, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0074] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the above expressions in various places in the description are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers that identify a particular order or pattern, rather than to denote a physical, logical, and / or chronological order or pattern. Furthermore, the terms "comprise", "comprising", "include", "including", and the like, specify the presence of stated features, structures, materials, and / or characteristics, but do not preclude the presence or addition of one or more other features, structures, materials, and / or characteristics.

[0075] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the application. Accordingly, such modifications and changes are intended to fall within the scope of the application as defined by the appended claims and their equivalents.

[0076] The above descriptions are specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A sand-proof flat gate valve, characterized in that, include: The valve plate assembly and two integral valve seats are respectively attached to the two sides of the valve plate assembly; The integral valve seat is an integral structure with a baffle. The baffle faces the valve plate assembly. The integral valve seat is embedded in the fluid channel of the valve body. One side of the baffle is in contact with the valve plate assembly.

2. The sand-proof flat gate valve according to claim 1, characterized in that, The valve plate assembly includes two sets of valve plates and a spring, with the spring disposed between the two sets of valve plates, and the two sets of valve plates movably fitting together.

3. The sand-proof flat gate valve according to claim 2, characterized in that, The valve plate assembly is provided with a first through hole corresponding to the fluid channel.

4. The sand-proof flat gate valve according to claim 3, characterized in that, An embedded valve core is provided in the first through hole. O-ring grooves are provided on the outer diameter of the embedded valve core at the contact points with the two sets of valve plates. A valve core sealing ring is fitted in the O-ring groove and fills the gap between the outer diameter of the embedded valve core and the first through hole of the two sets of valve plates.

5. The sand-proof flat gate valve according to claim 1, characterized in that, The valve body is provided with an integral valve seat hole corresponding to the integral valve seat, and the integral valve seat is embedded in the integral valve seat hole.

6. The sand-proof flat gate valve according to claim 5, characterized in that, A wave spring is provided between the end face of the integral valve seat and the side wall of the integral valve seat hole.

7. The sand-proof flat gate valve according to any one of claims 1 to 6, characterized in that, A valve seat sealing ring is fitted onto the outer diameter of the integral valve seat.

8. The sand-proof flat gate valve according to claim 1, characterized in that, The bottom of the baffle of the integral valve seat extends to the bottom of the valve cavity, and the gap between the bottom of the baffle and the bottom of the valve cavity is 1-5mm.

9. The sand-proof flat gate valve according to claim 1, characterized in that, The integral valve seat is provided with a second through hole, which penetrates the integral valve seat and communicates with the fluid channel. The axis of the second through hole is collinear with the axis of the fluid channel.

10. The sand-proof flat gate valve according to any one of claims 1 to 4, characterized in that, It also includes a handwheel and a valve stem. The top of the valve stem is connected and fixed to the central axis of the handwheel. A sleeve is fitted on the valve stem by means of a threaded connection. The valve plate assembly is provided with a T-slot corresponding to the sleeve. The sleeve mates with the T-slot of the valve plate assembly.

Images