A flat gate valve

Abstract

The present invention discloses a flat gate valve, comprising a valve body, a valve plate, a piston and a control disc; the valve body is provided with an inlet, an outlet and a valve body middle cavity, the valve plate is arranged in the valve body and can move relative to the valve body; the piston is slidably arranged in the valve body, one end of the piston extends to the valve body middle cavity, and the other end of the piston is an inclined first inclined surface; the control disc is rotatably arranged in the valve body, and one end of the control disc is an inclined second inclined surface; the control disc can be rotated relative to the valve body until the second inclined surface is parallel to the first inclined surface, so that the piston can move relative to the valve body in a direction close to the control disc; the control disc can be rotated relative to the valve body until the second inclined surface is against the first inclined surface, so as to drive the piston to move relative to the valve body in a direction away from the control disc. The flat gate valve utilizes the piston and the control disc to avoid the rapid increase of the pressure in the valve body middle cavity when the medium in the valve body middle cavity is heated, thereby protecting the valve body and the valve plate, and improving the service life and working reliability of the flat gate valve.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a flat gate valve. Background Art

[0002] The gate valve is one of the most commonly used cut-off valves, which is mainly used to connect or cut off the medium in the pipeline, and is not used to adjust the medium flow. Due to the wide range of pressure, temperature and diameter span of the gate valve, the gate valve has been widely used in many fields.

[0003] The main components of the gate valve include the valve seat, valve stem and valve plate. The inner side of the valve seat has a sealing ring, which contacts and seals with the end face of the valve plate to block the flow of the fluid. The flat gate valve is a type of gate valve. When the flat gate valve is closed, there is usually a pressure medium in the middle cavity of the valve body. As the flat gate valve is closed for a long time, if the temperature of the upstream medium rises, causing the temperature of the medium in the middle cavity of the valve body to rise, the pressure in the middle cavity of the valve body will rise sharply due to thermal expansion, which will not only damage the valve body, but also cause the valve plate to get stuck, which is easy to cause the valve stem to break when the valve plate is opened; at the same time, due to the stuck valve plate, it is more difficult to twist the handle, which requires a lot of manpower. Summary of the invention

[0004] In view of the above problems, the present invention proposes a flat gate valve to overcome the above problems or at least partially solve the above problems.

[0005] A flat gate valve comprises a valve body, a valve plate, a piston and a control disc; the valve body is provided with an inlet, an outlet and a valve body cavity, the valve plate is arranged in the valve body and can move relative to the valve body to control the opening and closing between the inlet, the outlet and the valve body cavity; the piston is slidably arranged in the valve body, one end of the piston extends to the valve body cavity, and the other end of the piston is an inclined first inclined surface; the control disc is rotatably arranged in the valve body, one end of the control disc is an inclined second inclined surface, and the second inclined surface is arranged opposite to the first inclined surface; the control disc can be rotated relative to the valve body until the second inclined surface is parallel to the first inclined surface, so that the piston can move relative to the valve body in a direction close to the control disc; the control disc can be rotated relative to the valve body until the second inclined surface is in contact with the first inclined surface, so as to drive the piston to move relative to the valve body in a direction away from the control disc; when the control disc is rotated relative to the valve body until the second inclined surface is parallel to the first inclined surface, the gap between the second inclined surface and the first inclined surface is greater than the movement amount of the piston when the temperature of the medium in the valve body cavity increases.

[0006] Preferably, the control disk is rotatably connected to the valve body through a torsion spring, a control plate is provided on the control disk, a control chamber is provided on the valve body, the control plate is located in the control chamber and divides the control chamber into a control front chamber and a control rear chamber; the control front chamber can be selectively connected to the inlet and the outlet, and the control rear chamber is connected to the atmosphere, and the torsion spring can drive the control disk to drive the control plate to rotate in the direction of the control front chamber, so as to drive the second inclined surface to rotate to be parallel to the first inclined surface.

[0007] Preferably, the flat gate valve also includes a pressure push plate; the pressure push plate is slidably arranged in the valve body and can reciprocate relative to the valve body; the valve body is provided with a first valve body flow channel, a second valve body flow channel and a third valve body flow channel, and the pressure push plate is provided with a first push plate flow channel and a second push plate flow channel, one end of the first valve body flow channel is connected to the inlet, one end of the second valve body flow channel is connected to the outlet, and one end of the third valve body flow channel is connected to the control front chamber; the movement of the pressure push plate can connect the two ends of the first push plate flow channel with the other end of the first valve body flow channel and the other end of the third valve body flow channel respectively, or connect the two ends of the second push plate flow channel with the other end of the second valve body flow channel and the other end of the third valve body flow channel respectively.

[0008] Preferably, the valve body is further provided with a fourth valve body flow channel, a fifth valve body flow channel and a sixth valve body flow channel, the control disk is provided with a first communication groove and a second communication groove, the pressure push plate is slidably arranged along the direction of the reciprocating movement of the valve plate relative to the valve body, and the top of the pressure push plate can abut against the bottom of the valve plate; one end of the fourth valve body flow channel extends to the bottom of the pressure push plate, the other end of the fourth valve body flow channel extends to communicate with the first communication groove or with the second communication groove, one end of the fifth valve body flow channel is connected to the inlet, the other end of the fifth valve body flow channel extends to be able to communicate with the first communication groove, and one end of the sixth valve body flow channel is connected to the outlet The other end of the sixth valve body flow channel extends to be able to communicate with the second communication groove; when the control plate is rotated to the end of the control front chamber, the first communication groove is communicated with the fourth valve body flow channel and the fifth valve body flow channel, and when the control plate is rotated to the end of the control rear chamber, the second communication groove is communicated with the fourth valve body flow channel and the sixth valve body flow channel; when the pressure push plate moves to the terminal position in the opening direction of the valve plate, the first push plate flow channel is communicated with the first valve body flow channel and the third valve body flow channel; when the pressure push plate moves to the terminal position in the closing direction of the valve plate, the second push plate flow channel is communicated with the second valve body flow channel and the fourth valve body flow channel.

[0009] Preferably, the flat gate valve is also provided with an auxiliary spring; the top of the pressure push plate extends into the middle cavity of the valve body and forms abutment with the valve plate that extends into the middle cavity of the valve body in a closed state, and the auxiliary spring is located between the bottom of the pressure push plate and the valve body to form a force on the pressure push plate in the opening direction of the valve plate.

[0010] Preferably, a sliding connection is formed between the valve body and the pressure push plate via a positioning pin and a positioning groove, and the positioning pin extends into the positioning groove to limit the reciprocating position of the pressure push plate relative to the valve body.

[0011] Preferably, a sliding connection is formed between the valve body and the piston via a flat key and a flat key groove, and the flat key extends into the flat key groove, so that the piston reciprocates in a linear direction.

[0012] Preferably, the flat gate valve further comprises a handle; the handle is connected to the valve plate to drive the valve plate to reciprocate relative to the valve body.

[0013] Preferably, the flat gate valve further comprises a valve stem; the lower end of the valve stem is rotatably connected to the valve plate, the upper end of the valve stem is threadedly connected to the handle, and the valve stem is slidably connected to the valve body along the vertical direction.

[0014] Preferably, a sliding connection is formed between the valve body and the valve stem via a guide pin and a guide groove, and the guide pin extends into the guide groove to limit the rotation of the valve stem relative to the valve body.

[0015] The flat gate valve of the present invention has the following beneficial technical effects:

[0016] 1. In the present invention, by providing a piston with a first inclined surface and a control disk with a second inclined surface, when the flat gate valve is closed, the control disk is rotated to a position where the second inclined surface is parallel to the first inclined surface, so that there is a gap between the piston and the control disk. When the medium in the cavity of the valve body expands due to heat, the piston can be pushed to move in a direction close to the control disk, thereby preventing the pressure in the cavity of the valve body from increasing rapidly, thereby protecting the valve body and the valve plate, and improving the service life and working reliability of the flat gate valve.

[0017] 2. In the present invention, by setting a pressure push plate, when the valve plate rises, the high-pressure medium at the inlet is introduced into the bottom of the pressure push plate to drive the pressure push plate to move upward, forming an upward pushing force for the valve plate, thereby assisting the upward movement of the valve plate, making it easier to open the valve plate and saving manpower.

[0018] 3. In the present invention, a control panel and a pressure push plate are provided, and the rotation of the control panel can be controlled when the pressure push plate moves up and down. After the control panel is rotated into place, the medium pressure at the bottom of the pressure push plate can be controlled, thereby forming a staggered control between the control panel and the pressure push plate, with an ingenious structure and high integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the cross-sectional structure of the flat gate valve of this embodiment;

[0020] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0021] Figure 3 for Figure 1 Schematic diagram of the local structure of the bottom area of ​​the medium flat gate valve;

[0022] Figure 4 for Figure 2 The schematic diagram of the local enlarged structure at position I in the middle;

[0023] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure along the DD direction;

[0024] Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure along the BB direction;

[0025] Figure 7 for Figure 3 Schematic diagram of the cross-sectional structure along the CC direction;

[0026] Figure 8 for Figure 3 Schematic diagram of the cross-sectional structure along the EE direction. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] Combination Figures 1 to 8 As shown, the flat gate valve of this embodiment includes a valve body 1, a valve plate 2, a piston 3 and a control disk 4. The valve body 1 is provided with an inlet 5, an outlet 6 and a valve body cavity 7. The valve plate 2 is arranged in the valve body 1 and can reciprocate relative to the valve body 1 to control the on-off relationship between the inlet 5, the outlet 6 and the valve body cavity 7. The piston 3 is slidably arranged in the valve body 1, one end of the piston 3 extends to the valve body cavity 7, and the other end of the piston 3 is an inclined first inclined surface. The control disk 4 is rotatably arranged in the valve body 1, one end of the control disk 4 is an inclined second inclined surface, and the second inclined surface is along the first inclined surface. Figure 1The control disk 4 can be rotated relative to the valve body until the second inclined surface is parallel to the first inclined surface, that is, Figure 1 and Figure 3 As shown, the piston 3 can move relative to the valve body 1 in the direction close to the control disk 4. The control disk 4 can also rotate relative to the valve body 1 until the second inclined surface and the first inclined surface are in contact with each other, so as to drive the piston 3 to move relative to the valve body 1 in the direction away from the control disk 4; when the control disk 4 rotates relative to the valve body 1 until the second inclined surface and the first inclined surface are parallel to each other, the gap between the second inclined surface and the first inclined surface is greater than the movement amount of the piston 3 when the temperature of the medium in the cavity of the valve body 1 increases.

[0029] At this time, when the flat gate valve is in the closed state, the piston and the control disc are just in Figure 1 and Figure 3 The position relationship shown, that is, the second inclined plane and the first inclined plane are in an interval parallel position relationship, so that when the temperature of the medium in the valve body cavity increases, for example, the temperature of the medium at the inlet increases and is transmitted to the medium in the valve body cavity, the thermal expansion generated by the increase in the temperature of the medium in the valve body cavity can push the piston to move toward the control disk, so that the pressure in the valve body cavity will not rise sharply, thereby protecting the valve body and the valve plate, and improving the service life and working reliability of the flat gate valve.

[0030] In this embodiment, a passage connected to the outside atmosphere is provided between the piston and the control disk to avoid forming a closed space between the first inclined surface and the second inclined surface to affect the free movement of the piston.

[0031] Combination Figure 1 , Figure 3 and Figures 5 to 7 As shown, in the flat gate valve of this embodiment, the control disk 4 is rotatably connected to the valve body 1 through a torsion spring 8, a control plate 9 is provided on the control disk 4, a control chamber is provided on the valve body 1, the control plate 9 is located in the control chamber and divides the control chamber into a control front chamber 10 and a control rear chamber 11. The control front chamber 10 can be selectively connected to the inlet 5 and the outlet 6, and the control rear chamber 11 is connected to the outside atmosphere through the air flow channel 12. The torsion spring 8 can drive the control disk 4 to drive the control plate 9 to rotate in the direction of the control front chamber 10, so as to drive the second inclined surface to rotate to be parallel to the first inclined surface, that is, drive the control disk 4 to drive the control plate 9 to rotate to Figure 6 As shown in the figure, the second inclined surface is rotated to Figure 3 The position shown is parallel to the first inclined surface.

[0032] At this time, by driving the control plate to drive the control disc to overcome the force of the torsion spring and reciprocate between the control front cavity and the control rear cavity, the corresponding relationship between the second inclined surface and the first inclined surface can be changed, so that the second inclined surface is parallel to the first inclined surface interval and the piston can move in the direction close to the control disc, or the second inclined surface is pressed against the first inclined surface to drive the piston to move away from the control disc, thereby realizing the reset of the piston. At the same time, the force of the torsion spring can make the second inclined surface parallel to the first inclined surface interval and maintain it in the parallel position, so that the piston can quickly respond to the temperature increase of the medium in the middle cavity of the valve body, thereby improving the protection effect of the flat gate valve.

[0033] Combination Figures 1 to 4 As shown, in the flat gate valve of this embodiment, a pressure push plate 13 is also included. The pressure push plate 13 is slidably arranged in the valve body 1 and can reciprocate relative to the valve body 1. The valve body 1 is provided with a first valve body flow channel 14, a second valve body flow channel 15 and a third valve body flow channel 16, and the pressure push plate 13 is provided with a first push plate flow channel 17 and a second push plate flow channel 18. One end of the first valve body flow channel 14 is connected to the inlet 5, one end of the second valve body flow channel 15 is connected to the outlet 6, and one end of the third valve body flow channel 16 is connected to the control front chamber 10. The movement of the pressure push plate 13 relative to the valve body 1 can connect the two ends of the first push plate flow channel 17 with the other end of the first valve body flow channel 14 and the other end of the third valve body flow channel 16, or connect the two ends of the second push plate flow channel 18 with the other end of the second valve body flow channel 15 and the other end of the third valve body flow channel 16, respectively.

[0034] At this time, by controlling the reciprocating movement of the pressure push plate relative to the valve body, the front chamber can be controlled to be connected to the inlet or the outlet through the flow channel, thereby driving the control plate to reciprocate by the interaction force between the medium pressure and the torsion spring.

[0035] Further, in the flat gate valve of the present embodiment, the valve body 1 is further provided with a fourth valve body flow channel 19, a fifth valve body flow channel 20 and a sixth valve body flow channel 21, the control disk 4 is provided with a first communication groove 22 and a second communication groove 23, and the pressure push plate 13 is slidably arranged along the direction in which the valve plate 2 moves back and forth relative to the valve body 1, that is, along Figure 1 The valve body 20 reciprocates in the vertical direction shown, and the top of the pressure push plate 13 can abut against the bottom of the valve plate 2. One end of the fourth valve body flow channel 19 extends to the bottom of the pressure push plate 13, and the other end of the fourth valve body flow channel 19 extends to communicate with the first communication groove 22 or the second communication groove 23, one end of the fifth valve body flow channel 20 is connected to the inlet 5, and the other end of the fifth valve body flow channel 20 extends to be able to communicate with the first communication groove 22, one end of the sixth valve body flow channel 21 is connected to the outlet 6, and the other end of the sixth valve body flow channel 21 extends to be able to communicate with the second communication groove 23.

[0036] When the control plate 9 rotates to the end of the control front cavity 10, that is, Figure 6 and Figure 7 In the position shown, the first communication groove 22 is connected with the fourth valve body flow channel 19 and the fifth valve body flow channel 20, thereby guiding the medium at the inlet 5 to the bottom of the pressure push plate 13, so that the medium at the inlet 5 can be used to drive the pressure push plate 13 to move upward to assist the opening of the valve plate 2. When the control plate 9 rotates to the end of the control rear cavity 11, the second communication groove 23 is connected with the fourth valve body flow channel 19 and the sixth valve body flow channel 21, thereby guiding the medium at the outlet 6 to the bottom of the pressure push plate 13.

[0037] At the same time, when the pressure push plate 13 moves to the terminal position in the opening direction of the valve plate 2, that is, along Figure 1 When the pressure push plate 13 moves upward to the terminal position, the first push plate flow channel 17 is connected to the first valve body flow channel 14, so that the medium at the inlet 5 is guided to the control front chamber 10 to drive the control plate 9 to rotate against the force of the torsion spring 8. Figure 1 As shown, when it moves downward to the terminal position, the second push plate flow channel 18 is connected with the second valve body flow channel 15, so that the medium at the outlet 6 is guided to the control front chamber 10, so that the control plate 9 can rotate in the opposite direction to the end of the control front chamber 10 under the action of the torsion spring 8.

[0038] At this time, the rotation of the control panel and the movement of the pressure push plate are interrelatedly controlled, so that the rotation of the control panel can be controlled when the pressure push plate moves up and down, and when the control panel is rotated into place, the medium pressure change at the bottom of the pressure push plate can be controlled, forming a staggered control with ingenious structure and high integration.

[0039] Combination Figure 3 As shown, in the flat gate valve of this embodiment, an auxiliary spring 24 is also provided. The top of the pressure push plate 13 extends into the valve body cavity 7 and abuts against the valve plate 2 extending into the valve body cavity 7 in the closed state, and the auxiliary spring 24 is located between the bottom of the pressure push plate 13 and the valve body 1 to form a force on the pressure push plate 13 in the opening direction of the valve plate 2.

[0040] At this time, when the flat gate valve is fully opened, the valve plate moves upward and breaks away from the contact with the pressure push plate, allowing the inlet medium to flow into the valve body cavity. When the medium pressures at the upper and lower ends of the pressure push plate are the same, the pressure push plate can be maintained in the upward terminal position under the action of the auxiliary spring.

[0041] Further, combined with Figure 3As shown, in this embodiment, a positioning pin 25 is provided on the valve body 1, and a positioning groove 26 is provided on the pressure push plate 13. The positioning pin 25 extends into the positioning groove 26 to limit the position of the pressure push plate 13 to reciprocate relative to the valve body 1. In this way, the moving position of the pressure push plate can be accurately positioned, thereby accurately controlling the on-off relationship between each flow channel.

[0042] Combination Figure 1 and Figure 2 As shown, in the flat gate valve of this embodiment, a handle 27 is also included. The handle 27 is connected to the valve plate 2 to drive the valve plate 2 to reciprocate relative to the valve body 1. Specifically, a valve stem 28 is also provided in the flat gate valve, wherein the lower end of the valve stem 28 is rotatably connected to the valve plate 2, such as a hook-type connection, and the upper end of the valve stem 28 is threadedly connected to the handle 27, and the valve stem 28 is slidably connected to the valve body 1 in the vertical direction. At this time, by rotating the handle, the threaded connection and the sliding connection between the valve stem and the valve body in the vertical direction can be used to drive the valve stem to reciprocate linearly relative to the valve body in the vertical direction, thereby controlling the opening and closing of the valve plate.

[0043] Combination Figure 2 As shown, in this embodiment, a guide groove 29 is further provided on the valve body 1, and a guide pin 30 is provided on the valve stem 28. The guide pin 30 extends into the guide groove 29 to limit the rotation of the valve stem 28 relative to the valve body 1, thereby realizing the reciprocating linear movement of the valve stem 28 relative to the valve body 1 in the vertical direction.

[0044] In addition, a flat key groove is provided on the valve body of this embodiment, and a flat key is provided on the piston. By extending the flat key into the flat key groove, the piston is reciprocated in a straight line direction, ensuring accurate control of the piston by the control disk.

[0045] In addition, combined Figures 1 to 8 As shown, in the present embodiment, the valve body 1 adopts a split structural design, which is composed of a plurality of components, specifically including a main body 31 of the valve body 1, a valve cover 32 located above the main body 31, a guide plate 33 with a guide groove 29, and a cover plate 34 connected to the main body 31, so as to facilitate the setting and installation of each flow channel and a piston, a control disc and a pressure push plate, whereby each flow channel is composed of a combination of corresponding flow channels arranged on different components, wherein, in the present embodiment, the fifth valve body flow channel 20 is connected to the inlet 5 through the first valve body flow channel 14, and the sixth valve body flow channel 21 is connected to the outlet 6 through the second valve body flow channel 15, thereby optimizing the opening of the flow channel in the valve body.

[0046] Combination Figures 1 to 8 As shown, the specific working process of the flat gate valve in this embodiment is as follows:

[0047] When the flat gate of this embodiment is in the closed state, the flat gate valve is in Figure 1In the state shown, the piston 3 and the control disc 4 are in an interval and parallel position, the control front chamber 10 is connected to the outlet 6 through the third valve body flow channel 16 and the second valve body flow channel 15, and the control plate 9 is located at the end of the control front chamber 10 under the action of the torsion spring 8, and the valve body middle chamber 7 is filled with medium. At this time, when the temperature of the medium at the inlet 5 rises, the temperature of the medium in the valve body middle chamber 7 also rises, and the increase in the temperature of the medium generates thermal expansion, which pushes the piston 3 to move in the direction close to the control disc 4, increasing the volume of the valve body middle chamber 7, so that the pressure in the valve body middle chamber 7 will not rise sharply, avoiding damage to the valve body 1 and the valve plate 2.

[0048] When the flat gate valve of this embodiment needs to be opened, the handle 27 is manually rotated, and the valve stem 28 is driven to move upward relative to the valve body 1 under the guidance of the guide groove 29 and the guide pin 30, so that the valve stem 28 drives the valve plate 2 to move upward. At the same time, the control plate 9 continues to be maintained at the end of the control front chamber 10 under the action of the torsion spring 8, that is, Figure 7 As shown in the position, the fourth valve body flow channel 19 and the fifth valve body flow channel 20 are connected through the first communication groove 22, and then the medium at the inlet 5 flows to the bottom of the pressure push plate 13 through the first valve body flow channel 14, the fifth valve body flow channel 20, the first communication groove 22 and the fourth valve body flow channel 19, so as to form a thrust for the pressure push plate 13 to move upward, and the auxiliary valve stem 28 drives the valve plate 2 to move upward. When the pressure push plate 13 moves upward to the terminal position, the first push plate flow channel 17 moves to its two ends to communicate with the first valve body flow channel 14 and the third valve body flow channel 16 respectively, so that the medium at the inlet 5 flows to the control front chamber 10 through the first valve body flow channel 14, the first push plate flow channel 17, and the third valve body flow channel 16, so as to push the control plate 9 to overcome the force of the torsion spring 8 and rotate toward the end direction of the control rear chamber 11. At this time, on the one hand, the second inclined surface on the control disk 4 is driven to rotate and form abutment with the first inclined surface to drive the piston 3 to move and reset in the direction away from the control disk 4 and cannot move in the direction close to the control disk 4. On the other hand, the rotation of the control disk 4 causes the second communication groove 23 to move to connect the fourth valve body flow channel 19 with the sixth valve body flow channel 21, and then the outlet 6 is connected to the bottom of the pressure push plate 13 through the second valve body flow channel 15, the sixth valve body flow channel 21, the second communication groove 23 and the fourth valve body flow channel 19. When the valve plate 2 fully opens the inlet 5 and the outlet 6, the valve plate 2 separates from the pressure push plate 13, the flat gate valve is fully opened, and the medium at the inlet 5 enters the valve body cavity 7. The medium pressure at both ends of the pressure push plate 13 is equal and is maintained at the maximum upward position under the action of the auxiliary spring 24.

[0049] When the flat gate valve of the present embodiment needs to be closed, the handle 27 is manually rotated, and under the guidance of the guide groove 29 and the guide pin 30, the valve stem 28 is driven to move downward relative to the valve body 1, so that the valve stem 28 drives the valve plate 2 to move downward, and after the valve plate 2 and the pressure push plate 13 are in contact, the pressure push plate 13 is pushed by the valve plate 2 to overcome the action of the auxiliary spring 24 and also move downward, and the medium at the bottom of the pressure push plate 13 flows to the outlet 6. Among them, when the pressure push plate 13 moves downward to the point where both the first push plate flow channel 17 and the second push plate flow channel 18 are not connected to the third valve body flow channel 16, the control front chamber 10 is in a closed state, so that the control disk 4 remains in a fixed position, and thus the bottom of the pressure push plate 13 remains connected to the outlet 6. When the pressure push plate 13 moves downward to the terminal position, the two ends of the second push plate flow channel 18 are connected with the second valve body flow channel 15 and the third valve body flow channel 16 respectively, so that the control front chamber 10 is connected with the outlet 6 through the third valve body flow channel 16, the second push plate flow channel 18 and the second valve body flow channel 15, so that under the action of the restoring force of the torsion spring 8, the control disk 4 is driven to move toward the end of the control front chamber 10, so that the second inclined surface rotates to a position parallel to the first inclined surface interval, completing the action cycle.

[0050] In addition, combined Figure 4 As shown, in this embodiment, when the valve plate 2 is completely closed, the contact area between the side surface of the bottom and the valve body 1 is designed to have a certain amount of covering, so that after the valve plate 2 completes the blocking of the inlet 5 and the outlet 6, it needs to move a certain distance before the pressure push plate 13 is pushed down to the terminal position. In this way, before the pressure push plate 13 moves downward to the terminal position, the valve plate 2 has already formed a seal on the valve body cavity 7, that is, the amount of medium in the valve body cavity 7 does not change, and in this process, the control disk 4 always maintains a top-to-top state with the piston 3 so that the piston 3 cannot move. Therefore, when the pressure push plate 13 moves downward to the terminal position, the control disk 4 rotates and the second inclined surface is rotated to be parallel to the first inclined surface interval, the piston 3 will not be affected by the change of the amount of medium in the valve body cavity 7 and will not form a large movement in the direction close to the control disk 4, thereby ensuring that there is a sufficient gap between the piston 3 and the control disk 4 to meet the movement amount of the piston 3 when the temperature of the medium in the valve body cavity 7 rises later.

Claims

1. A flat gate valve, characterized in that: The invention comprises a valve body, a valve plate, a piston and a control disk; the valve body is provided with an inlet, an outlet and a middle cavity of the valve body, the valve plate is arranged in the valve body and can move relative to the valve body to control the opening and closing between the inlet, the outlet and the middle cavity of the valve body; the piston is slidably arranged in the valve body, one end of the piston extends to the middle cavity of the valve body, and the other end of the piston is an inclined first inclined surface; the control disk is rotatably arranged in the valve body, one end of the control disk is an inclined second inclined surface, and the second inclined surface is arranged opposite to the first inclined surface; the control disk can be rotated relative to the valve body until the second inclined surface is parallel to the first inclined surface, so that the piston can move relative to the valve body in a direction close to the control disk; the control disk can be rotated relative to the valve body until the second inclined surface is in contact with the first inclined surface, so as to drive the piston to move relative to the valve body in a direction away from the control disk; when the control disk is rotated relative to the valve body until the second inclined surface is parallel to the first inclined surface, the gap between the second inclined surface and the first inclined surface is greater than the movement amount of the piston when the temperature of the medium in the middle cavity of the valve body increases; The control disk is rotatably connected to the valve body through a torsion spring, a control plate is provided on the control disk, a control chamber is provided on the valve body, the control plate is located in the control chamber and divides the control chamber into a control front chamber and a control rear chamber; the control front chamber can be selectively connected to the inlet and the outlet, and the control rear chamber is connected to the atmosphere, and the torsion spring can drive the control disk to drive the control plate to rotate in the direction of the control front chamber, so as to drive the second inclined surface to rotate to be parallel to the first inclined surface.

2. The flat gate valve according to claim 1, characterized in that: The flat gate valve also includes a pressure push plate; the pressure push plate is slidably arranged in the valve body and can reciprocate relative to the valve body; the valve body is provided with a first valve body flow channel, a second valve body flow channel and a third valve body flow channel, and the pressure push plate is provided with a first push plate flow channel and a second push plate flow channel, one end of the first valve body flow channel is connected to the inlet, one end of the second valve body flow channel is connected to the outlet, and one end of the third valve body flow channel is connected to the control front chamber; the movement of the pressure push plate can connect the two ends of the first push plate flow channel with the other end of the first valve body flow channel and the other end of the third valve body flow channel respectively, or connect the two ends of the second push plate flow channel with the other end of the second valve body flow channel and the other end of the third valve body flow channel respectively.

3. The flat gate valve according to claim 2, characterized in that: The valve body is also provided with a fourth valve body flow channel, a fifth valve body flow channel and a sixth valve body flow channel, the control disk is provided with a first communication groove and a second communication groove, the pressure push plate is slidably arranged along the direction in which the valve plate moves back and forth relative to the valve body, and the top of the pressure push plate can abut against the bottom of the valve plate; one end of the fourth valve body flow channel extends to the bottom of the pressure push plate, the other end of the fourth valve body flow channel extends to communicate with the first communication groove or communicate with the second communication groove, one end of the fifth valve body flow channel is communicated with the inlet, the other end of the fifth valve body flow channel extends to be able to communicate with the first communication groove, one end of the sixth valve body flow channel is communicated with the outlet, and the other end of the sixth valve body flow channel extends to be able to communicate with the second communication groove; when the control plate rotates to the end of the control front cavity, the first communication groove is communicated with the fourth valve body flow channel and the fifth valve body flow channel, and when the control plate rotates to the end of the control rear cavity, the second communication groove is communicated with the fourth valve body flow channel and the sixth valve body flow channel; When the pressure push plate moves to the terminal position in the direction of opening the valve plate, the first push plate flow channel is connected with the first valve body flow channel and the third valve body flow channel; when the pressure push plate moves to the terminal position in the direction of closing the valve plate, the second push plate flow channel is connected with the second valve body flow channel and the fourth valve body flow channel.

4. The flat gate valve according to claim 3, characterized in that: The flat gate valve is also provided with an auxiliary spring; the top of the pressure push plate extends into the middle cavity of the valve body and forms abutment with the valve plate that extends into the middle cavity of the valve body in a closed state, and the auxiliary spring is located between the bottom of the pressure push plate and the valve body to form a force on the pressure push plate in the opening direction of the valve plate.

5. The flat gate valve according to claim 4, characterized in that: The valve body and the pressure push plate are slidably connected via a positioning pin and a positioning groove, and the positioning pin extends into the positioning groove to limit the position of the pressure push plate in reciprocating motion relative to the valve body.

6. The flat gate valve according to any one of claims 1 to 5, characterized in that: The valve body and the piston are slidably connected via a flat key and a flat key groove, and the flat key extends into the flat key groove, so that the piston reciprocates in a linear direction.

7. The flat gate valve according to any one of claims 1 to 5, characterized in that: The flat gate valve also includes a handle; the handle is connected to the valve plate to drive the valve plate to reciprocate relative to the valve body.

8. The flat gate valve according to claim 7, characterized in that: The flat gate valve also includes a valve stem; the lower end of the valve stem is rotatably connected to the valve plate, the upper end of the valve stem is threadedly connected to the handle, and the valve stem is slidably connected to the valve body along the vertical direction.

9. The flat gate valve according to claim 8, characterized in that: The valve body and the valve stem are slidably connected via a guide pin and a guide groove, and the guide pin extends into the guide groove to limit the rotation of the valve stem relative to the valve body.

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