Flat gate valve

Abstract

The utility model belongs to the technical field of gate valves, and particularly relates to a flat gate valve which comprises a fixed valve body, an installation disc and a movable valve body. The mounting disc is detachably arranged on the fixed valve body, and a plurality of mounting positions connected with the mounting disc are arranged on the fixed valve body; one end of the movable valve body in an installation state can extend into the fixed valve body to press the valve seat so that the valve seat is in sealing fit with the gate plate, and an installation piece detachably connected with the installation disc is arranged on the movable valve body; when the mounting disc is located at different mounting positions, the movable valve body can be connected with the mounting disc through the mounting piece to reach a mounting state; compared with the prior art, the flat gate valve has the advantages that the valve seat and other components in the flat gate valve are convenient to disassemble and assemble, meanwhile, a plurality of optional mounting positions are arranged between the connected components, the same use requirements can be met at different mounting positions, and the use cost of the gate valve is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of gate valves, and particularly relates to a flat gate valve. Background Art

[0002] A gate valve is a common type of valve, mainly used to control the flow of media in a pipeline.

[0003] The valve seat of a traditional gate valve is formed by welding in the cavity of the valve body, and it is relatively difficult to disassemble. Once there is a problem such as poor sealing or other defects, the entire gate valve has to be replaced, resulting in a relatively high usage cost.

[0004] Based on this problem, a Chinese patent with the publication number CN204083298U discloses a gate valve with a detachable valve seat, which includes a valve stem, a valve seat, and a gate plate. The valve body is divided into a primary valve body and a secondary valve body, and the gate plate is arranged in the primary valve body; the valve seat is embedded in the valve seat ring, and both sides of the valve seat and the gate plate are in sealing fit; the valve seat ring is arranged in the fluid passage of the primary valve body, and a sealing ring is arranged at the connection between the valve seat ring and the primary valve body; the secondary valve body is threadedly connected to the primary valve body, and one end extends into the primary valve body to abut against the valve seat ring; through the detachable structural design of the primary valve body and the secondary valve body, it is convenient to disassemble and replace the valve seat. When the valve seat fails, there is no need to replace the entire gate valve, reducing the usage cost of the gate valve; however, in this technology, the primary valve body and the secondary valve body are directly connected by threads, and it is necessary to set thread fits on the inner wall of the primary valve body and the outer wall of the secondary valve body. When the threads on the primary valve body are worn or damaged, the secondary valve body cannot cooperate with the primary valve body. At this time, the threaded connection is likely to cause leakage of the internal medium of the gate valve, and the sealing performance of the gate valve cannot be guaranteed. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a flat gate valve for the above-mentioned existing technical problems. In this flat gate valve, components such as the valve seat are convenient to disassemble and assemble, and there are multiple alternative installation positions between the connected components. The same usage requirements can be achieved at different installation positions, reducing the usage cost of the gate valve.

[0006] In view of this, the utility model provides a flat gate valve, including:

[0007] A fixed valve body, in which a gate plate and a detachable valve seat are provided;

[0008] An installation disk, which is detachably arranged on the fixed valve body, and multiple installation positions for connecting the installation disk are provided on the fixed valve body;

[0009] A movable valve body, one end of which can extend into the fixed valve body to press the valve seat tightly in the installation state so that the valve seat and the gate plate are in sealing fit, and an installation part for detachably connecting with the installation disk is provided on the movable valve body;

[0010] Among them, when the installation disk is located at different installation positions, the movable valve body can be connected to the installation disk through the installation part to reach the installation state.

[0011] In this technical solution, select a suitable installation position on the fixed valve body to connect the installation disk to the fixed valve body, install the valve seat into the fixed valve body to contact the gate plate, then extend one end of the movable valve body into the fixed valve body to press the valve seat inward, so that the valve seat is in sealing fit with the gate plate. At this time, connect the movable valve body to the fixed valve body through the installation part to reach the installation state, and then the flat gate valve can be used normally; when it is necessary to disassemble the valve seat, first separate the movable valve body from the installation disk, and then take out the end of the movable valve body from the fixed valve body, and then the valve seat can be removed from the fixed valve body.

[0012] In the above technical solution, further, the contact surface between the fixed valve body and the movable valve body is a frustum groove that gradually increases from the inside to the outside. The outer contour of the end of the movable valve body extending into the fixed valve body is a frustum that fits the frustum groove. After the installation part connects the movable valve body and the installation disk, the distance between the movable valve body and the installation disk can be adjusted.

[0013] In the above technical solution, further, the installation part includes multiple extension plates and multiple screw rods. The multiple extension plates are spaced along the circumferential direction of the movable valve body. The extension plates are provided with first installation through holes, and multiple first installation screw holes are spaced along the circumferential direction on the installation disk. The movable valve body and the installation disk are connected by screw rods.

[0014] In the above technical solution, further, an installation sealing groove is provided at the notch of the frustum groove, and an outer sealing ring is provided in the installation sealing groove. The outer wall of the end of the movable valve body extending into the fixed valve body is in sealing fit with the inner ring of the outer sealing ring in the installation state.

[0015] In the above technical solution, further, the valve seat includes a support ring seat and a soft sealing ring. A mosaic ring groove is formed on the side wall of the support ring seat close to the gate plate. Threads with opposite helix directions are respectively provided on the inner wall and the outer wall of the mosaic ring groove. The soft sealing ring is arranged in the mosaic ring groove, and one end of the soft sealing ring extends out of the mosaic ring groove to be in sealing fit with the gate plate.

[0016] In the above technical solution, further, an end face sealing ring groove is formed on the side wall of the mosaic ring groove away from the gate plate, and an O-ring is provided in the end face sealing ring groove. Part of the O-ring extends out of the end face sealing ring groove to contact the soft sealing ring.

[0017] In the above technical solution, further, multiple second installation screw holes are spaced along the circumferential direction of the installation position on the fixed valve body, and multiple second installation through holes are spaced along the circumferential direction on the installation disk. The number of the second installation screw holes is more than the number of the second installation through holes. The installation disk and the fixed valve body are connected by fasteners.

[0018] In the above technical solution, further, a connecting flange is provided at one end of the movable valve body away from the fixed valve body.

[0019] The beneficial effects of the present utility model are as follows:

[0020] 1. Through the cooperative setting of the fixed valve body, the mounting disc, the movable valve body, and the mounting member, the fixed valve body and the movable valve body can be detachably connected, which is convenient for the installation and disassembly of the valve seat. In addition, there are multiple mounting positions between the mounting disc and the fixed valve body, and the movable valve body can be connected to the mounting disc to reach the mounting state at each mounting position, meeting the use requirements of the flat gate valve. In this way, even if one or several mounting positions on the fixed valve body are worn or damaged, the remaining mounting positions can still be used to connect the mounting disc, so as to normally connect the movable valve body to the fixed valve body, extending the service life of the flat gate valve.

[0021] 2. By designing the contact surface between the movable valve body and the fixed valve body as the cooperation of a frustum groove and a frustum, only by adjusting the distance between the movable valve body and the fixed valve body, the fitting degree of the contact surface between the movable valve body and the fixed valve body can be finely adjusted, ensuring the sealing performance of the flat gate valve.

[0022] 3. By designing the valve seat as the cooperation of a support ring seat, an inlaid ring groove, and a soft sealing ring, and respectively arranging threads with opposite helix directions on the inner wall and the outer wall of the inlaid ring groove, after the soft sealing ring is pressed into the inlaid ring groove, the soft sealing ring can be prevented from rotating and loosening in a single direction due to friction movement with the sealing surface of the gate plate, ensuring the sealing performance of the valve seat for the gate plate.

[0023] 4. By arranging an end face sealing ring groove in the inlaid ring groove, the contact area between the bottom of the soft sealing ring and the bottom of the inlaid ring groove can be reduced, the sealing specific pressure of the bottom end face of the soft sealing ring can be increased, and an O-ring is arranged in the end face sealing ring groove to contact with the soft sealing ring, so that the bottom of the soft sealing ring and the O-ring form an end face seal, improving the sealing performance and anti-loosening property of the soft sealing ring. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a three-dimensional schematic diagram of the installation state of the present utility model.

[0026] Figure 2 It is a longitudinal sectional structure schematic diagram of the installation state of the present utility model.

[0027] Figure 3 is Figure 2 The partial enlarged structural schematic diagram at position A in

[0028] Figure 4 This is the three-dimensional structural schematic diagram of the separated state of the fixed valve body and the movable valve body in the present utility model.

[0029] Figure 5 This is the three-dimensional structural schematic diagram of the fixed valve body in the present utility model.

[0030] Figure 6 This is the three-dimensional structural schematic diagram of the movable valve body in the present utility model.

[0031] The markings in the figure are indicated as:

[0032] 1. Fixed valve body; 101. Second installation screw hole; 2. Gate plate; 3. Valve seat; 301. Support ring seat; 302. Inlaid ring groove; 303. Soft sealing ring; 304. End face sealing ring groove; 305. O-ring; 4. Installation disk; 401. First installation screw hole; 402. Second installation through hole; 5. Movable valve body; 601. Extension plate; 6011. First installation through hole; 602. Screw; 7. Installation sealing groove; 8. Outer sealing ring; 9. Connecting flange; 10. Medium inlet end; 11. Medium outlet end; 12. Valve stem; Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0034] In the description of the present utility model, it should be noted that the terms used here are only for describing specific embodiments, rather than intending to limit the exemplary embodiments according to the present application. For the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but in appropriate cases, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0035] Embodiment 1

[0036] As shown Figures 1-6 in the figure, this embodiment provides a flat gate valve, including: a fixed valve body 1, a mounting disc 4, and a movable valve body 5.

[0037] The fixed valve body 1 has a medium inlet end 10 and a medium outlet end 11. When the medium inlet end 10 is in communication with the medium outlet end 11, the medium can pass through the flat gate valve; when the medium inlet end 10 and the medium outlet end 11 are not in communication, the medium cannot pass through the flat gate valve. A gate plate 2 is provided in the fixed valve body 1. Removable valve seats 3 are provided on both sides of the gate plate 2. The two valve seats 3 extend from the medium inlet end 10 and the medium outlet end 11 respectively to contact the gate plate 2. A valve rod 12 is provided on the fixed valve body 1 to drive the movement of the gate plate 2, so as to realize the communication and disconnection of the medium inlet end 10 and the medium outlet end 11.

[0038] Mounting discs 4 are detachably connected to the fixed valve body 1 at the medium inlet end 10 and the medium outlet end 11. Taking the medium inlet end 10 as an example, please refer to Figure 5 the figure. A plurality of second mounting screw holes 101 are provided at intervals along the circumferential direction of the end of the fixed valve body 1 at the medium inlet end 10; please refer to Figure 4 the figure. The mounting disc 4 is of an annular structure. A plurality of second mounting through holes 402 are provided at intervals along the circumferential direction of the mounting disc 4. The number of the second mounting screw holes 101 is more than the number of the second mounting through holes 402. The mounting disc 4 and the fixed valve body 1 are connected by fasteners. When the mounting disc 4 and the medium inlet end 10 are coaxially distributed, the mounting disc 4 rotates a certain angle along the circumferential direction, and the second mounting screw hole 101 opposite to the position of the second mounting through hole 402 can be found. By arranging fasteners on at least two symmetrically distributed second mounting through holes 402 and threadedly connecting them with the corresponding second mounting screw holes 101, the mounting disc 4 and the fixed valve body 1 can be connected. In this way, there are multiple mounting positions for connecting the mounting disc 4 on the fixed valve body 1. When one or several mounting positions on the fixed valve body 1 are worn or damaged, the remaining mounting positions can still be used to connect the mounting disc 4.

[0039] Please refer to Figure 1 the figure. Movable valve bodies 5 are connected to the fixed valve body 1 at both the medium inlet end 10 and the medium outlet end 11. Taking the medium inlet end 10 as an example, in the installed state, one end of the movable valve body 5 can extend into the medium inlet end 10 to press the valve seat 3 so that the valve seat 3 is sealed and fitted with the gate plate 2. An installation member for detachably connecting with the mounting disc 4 is provided on the movable valve body 5. When the mounting disc 4 is in different mounting positions, the movable valve body 5 can be connected to the mounting disc 4 through the installation member to reach the installed state. Here, the installed state can be understood as the state when the flat gate valve can be used normally.

[0040] In this embodiment, a connecting flange 9 is provided at one end of the movable valve body 5 away from the fixed valve body 1. When the flat gate valve is in use, the required pipeline can be connected through the connecting flange 9 to control the medium transportation.

[0041] In this embodiment, the mounting disc 4 is selected to be connected to the fixed valve body 1 at a suitable mounting position on the fixed valve body 1. The valve seat 3 is installed in the fixed valve body 1 to contact the gate plate 2. Then, one end of the movable valve body 5 is inserted into the fixed valve body 1 to press the valve seat 3 inward, so that the valve seat 3 is in sealing fit with the gate plate 2. At this time, the movable valve body 5 is connected to the fixed valve body 1 through the mounting member to reach the installed state, and the flat gate valve can be used normally; when the valve seat 3 needs to be disassembled, first separate the movable valve body 5 from the mounting disc 4, and then take out the end of the movable valve body 5 from the fixed valve body 1, and the valve seat 3 can be removed from the fixed valve body 1.

[0042] Embodiment 2

[0043] This embodiment provides a flat gate valve. In addition to including the technical solutions of the above embodiment, a structure for connecting the movable valve body 5 and the fixed valve body 1 is also disclosed;

[0044] Please refer to Figure 5 , in this embodiment, taking the medium inlet end 10 as an example, the contact surface between the inner wall of the medium inlet end 10 and the movable valve body 5 is a frustum groove that gradually increases from the inside to the outside. Please refer to Figure 6 , the outer contour of the end of the movable valve body 5 extending into the fixed valve body 1 is a frustum body adapted to the frustum groove. After the mounting member connects the movable valve body 5 and the mounting disc 4, the distance between the movable valve body 5 and the mounting disc 4 can be adjusted;

[0045] Please refer to Figure 6 , the mounting member includes a plurality of extension plates 601 and a plurality of screw rods 602. The plurality of extension plates 601 are spaced along the circumferential direction of the movable valve body 5. The extension plates 601 are provided with first mounting through holes 6011. A plurality of first mounting screw holes 401 are provided at intervals along the circumferential direction on the mounting disc 4. The movable valve body 5 and the mounting disc 4 are connected through the screw rods 602;

[0046] Please refer to Figure 2 , in the installed state, the end of the movable valve body 5 extends into the medium inlet end 10 to press the valve seat 3, so that the valve seat 3 is in sealing fit with the gate plate 2. The outer contour surface of the end of the movable valve body 5 is in contact with the inner wall of the medium inlet end 10; at this time, the threaded end of the screw rod 602 passes through the first mounting through hole 6011 and is threadedly connected to the first mounting screw hole 401. By rotating the screw rod 602, the distance between the movable valve body 5 and the mounting disc 4 can be adjusted, thereby finely adjusting the fitting degree of the contact surface between the movable valve body 5 and the fixed valve body 1 to ensure the sealing performance of the flat gate valve.

[0047] Embodiment 3

[0048] This embodiment provides a flat gate valve. On the basis of the technical solutions of the above embodiments and on the basis of Embodiment 2, the connection between the fixed valve body 1 and the movable valve body 5 is further optimized;

[0049] Please refer to Figure 2 , at the notch of the frustum groove, an installation sealing groove 7 is provided. An outer sealing ring 8 is provided in the installation sealing groove 7. Before installing the movable valve body 5, the outer sealing ring 8 is pressed into the installation sealing groove 7. At this time, the inner ring part of the outer sealing ring 8 extends out of the installation sealing groove 7. During the process that the end of the movable valve body 5 extends into the medium inlet end 10, the outer contour of the end of the movable valve body 5 will contact the inner ring of the outer sealing ring 8 and squeeze the outer sealing ring 8 into the installation sealing groove 7. In the installed state, the inner ring of the outer sealing ring 8 is in sealing fit with the outer wall of the end of the movable valve body 5, thereby further improving the sealing performance of the flat gate valve.

[0050] Embodiment 4

[0051] This embodiment provides a flat gate valve. On the basis of the technical solutions of the above embodiments and on the basis of Embodiment 1 and / or Embodiment 2, the seal between the valve seat 3 and the gate plate 2 is further optimized;

[0052] Please refer to Figure 3 , the valve seat 3 includes a support ring seat 301 and a soft sealing ring 303. An inlay ring groove 302 is formed on the side wall of the support ring seat 301 close to the gate plate 2. Threads with opposite helix directions are provided on the inner wall and the outer wall of the inlay ring groove 302. For example, if a positive thread is provided on the inner wall of the inlay ring groove 302, a reverse thread is provided on the outer wall of the inlay ring groove 302. The soft sealing ring 303 is arranged in the inlay ring groove 302, and one end of the soft sealing ring 303 extends out of the inlay ring groove 302 and is in sealing fit with the gate plate 2. After the soft sealing ring 303 is pressed into the inlay ring groove 302 in this way, it can prevent the soft sealing ring 303 from rubbing and moving with the sealing surface of the gate plate 2, resulting in the soft sealing ring 303 rotating and loosening in one direction, ensuring the sealing performance of the valve seat 3 to the gate plate 2; in addition, the processing technology of the positive and reverse helix threads is good, simple and efficient.

[0053] In this embodiment, please refer to Figure 3 , an end face sealing ring groove 304 is formed on the side wall of the inlay ring groove 302 away from the gate plate 2, which can reduce the contact area between the bottom of the soft sealing ring 303 and the bottom of the inlay ring groove 302 and improve the sealing specific pressure of the bottom end face of the soft sealing ring 303;

[0054] An O-ring 305 is provided in the end face seal ring groove 304. Part of the O-ring 305 extends out of the end face seal ring groove 304 to contact the soft seal ring 303. The O-ring 305 is arranged in the end face seal ring groove 304 to contact the soft seal ring 303, so that the bottom of the soft seal ring 303 and the O-ring 305 form an end face seal, improving the sealing performance and anti-loosening property of the soft seal ring 303.

[0055] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments in this application can be combined with each other. This application is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of this application, those of ordinary skill in the art can also make many forms without departing from the purpose of this application and the scope protected by the claims, and all of them belong to the protection scope of this application.

Claims

1. A flat gate valve, characterized in that, Comprising: A fixed valve body (1), in which a gate plate (2) and a detachable valve seat (3) are provided; An installation disk (4), which is detachably arranged on the fixed valve body (1), and a plurality of installation positions for connecting with the installation disk (4) are provided on the fixed valve body (1); A movable valve body (5), one end of the movable valve body (5) can extend into the fixed valve body (1) in the installation state to press the valve seat (3) so that the valve seat (3) is in sealing fit with the gate plate (2), and an installation part for detachably connecting with the installation disk (4) is provided on the movable valve body (5); Wherein, when the installation disk (4) is located at different installation positions, the movable valve body (5) can be connected with the installation disk (4) through the installation part to reach the installation state.

2. The slab gate valve according to claim 1, wherein: The contact surface between the fixed valve body (1) and the movable valve body (5) is a frustum groove gradually increasing from inside to outside, the outer contour of the end of the movable valve body (5) extending into the fixed valve body (1) is a frustum body adapted to the frustum groove, and after connecting the movable valve body (5) with the installation disk (4), the installation part can adjust the distance between the movable valve body (5) and the installation disk (4).

3. A parallel slide gate valve according to claim 2, characterized in that: The installation part includes a plurality of extension plates (601) and a plurality of screw rods (602), the plurality of extension plates (601) are spaced along the circumferential direction of the movable valve body (5), a first installation through hole (6011) is provided on the extension plate (601), a plurality of first installation screw holes (401) are provided at intervals along the circumferential direction on the installation disk (4), and the movable valve body (5) and the installation disk (4) are connected through the screw rods (602).

4. A parallel slide gate valve according to claim 2, characterized in that: An installation sealing groove (7) is provided at the notch of the frustum groove, an outer sealing ring (8) is provided in the installation sealing groove (7), and the outer wall of the end of the movable valve body (5) extending into the fixed valve body (1) is in sealing fit with the inner ring of the outer sealing ring (8) in the installation state.

5. The slab gate valve according to claim 1, characterized in that: The valve seat (3) includes a support ring seat (301) and a soft sealing ring (303), an inlay ring groove (302) is formed on the side wall of the support ring seat (301) close to the gate plate (2), threads with opposite helix directions are respectively provided on the inner wall and the outer wall of the inlay ring groove (302), the soft sealing ring (303) is arranged in the inlay ring groove (302), and one end of the soft sealing ring (303) extends out of the inlay ring groove (302) to be in sealing fit with the gate plate (2).

6. The slab gate valve according to claim 5, wherein: An end face sealing ring groove (304) is formed on the side wall of the inlay ring groove (302) far from the gate plate (2), an O-ring (305) is arranged in the end face sealing ring groove (304), and a part of the O-ring (305) extends out of the end face sealing ring groove (304) to contact with the soft sealing ring (303).

7. A kind of flat gate valve according to claim 1, characterized in that: A plurality of second mounting screw holes (101) are provided at intervals along the circumferential direction of the mounting position on the fixed valve body (1). A plurality of second mounting through holes (402) are provided at intervals along the circumferential direction on the mounting disc (4). The number of the second mounting screw holes (101) is more than the number of the second mounting through holes (402). The mounting disc (4) and the fixed valve body (1) are connected by fasteners.

8. A parallel slide gate valve according to claim 1, characterized in that: A connecting flange (9) is provided at one end of the movable valve body (5) away from the fixed valve body (1).

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