A kind of flat valve structure

Abstract

The present invention discloses a structure of a flat valve, comprising: a gate, a valve seat and a valve stem; the gate is arranged inside the valve seat, and the top of the gate is connected to the bottom of the valve stem, the valve stem is arranged at the top of the valve seat, a pressure chamber is arranged at the bottom of the valve seat, the top of the pressure chamber can be in abutment with the bottom of the gate through a pressure sealing device, and a flow discharging device is arranged at the bottom of the pressure chamber. Through the design of the above structure, water accumulation in the valve seat can be avoided, thereby preventing the accumulated liquid from corroding the valve seat and the gate, improving the service life of the flat valve, and when opening and closing the gate, since the space inside the valve seat is free of liquid, the liquid will first fill the valve seat and then be transported, which can effectively reduce the occurrence of water hammer effect when opening and closing the gate, thereby improving the service life of the terminal water-using equipment.

Description

Technical Field

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

[0002] The flat valve structure currently used has a vertically arranged accommodating groove in the valve seat design to accommodate the opening and closing of the gate. The accommodating groove located at the top is the area where the sealing end of the gate is located, so no water or liquid will enter when the gate is opened and closed. However, the accommodating groove located at the bottom needs to accommodate the end of the gate with an opening, so when the gate is opened and closed, the liquid will enter the accommodating groove below from the leakage hole, and cannot be discharged or flow to form dead water. After the gate of the water valve is placed, opened and closed, and used for a long time, the liquid will slowly corrode the valve seat and the gate, and then cause the valve seat to leak and be damaged, affecting the service life of the water valve or causing the gate to decay, open and close poorly, or even cause the gate to close loosely. Therefore, it is necessary to propose a flat valve structure to at least partially solve the problems existing in the prior art. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In order to at least partially solve the above problems, the present invention provides a flat valve structure, including: a gate plate, a valve seat and a valve stem; the gate plate is arranged in the valve seat, and the top of the gate plate is connected to the bottom of the valve stem, the valve stem is arranged at the top of the valve seat, and a pressure chamber is arranged at the bottom of the valve seat, the top of the pressure chamber can abut against the bottom of the gate plate through a pressure sealing device, and the bottom of the pressure chamber is provided with a discharge device.

[0005] Preferably, the valve seat includes a water inlet end, a water outlet end, a water storage bin and a receiving bin; the water inlet end is connected to the water outlet end, the water storage bin and the receiving bin are located in the same vertical direction, and the gate plate passes through the receiving bin and the water storage bin, the pressure chamber is arranged below the water storage bin, and the pressure chamber is connected to the water storage bin through the pressure sealing device.

[0006] Preferably, the gate plate is a flat gate, and a flow hole is provided on the gate plate. The flow hole can be moved into the water storage tank, and the water inlet end and the water outlet end are connected through the flow hole.

[0007] Preferably, a sleeve is provided at the connection between the water inlet end and the water outlet end, and the gate plate penetrates through the sleeve and is slidably and sealingly connected to the sleeve.

[0008] Preferably, the valve stem is a threaded pipe and is connected to the top of the gate plate through a threaded sleeve. The threaded sleeve penetrates through the top of the storage bin and is slidably and sealingly connected to the storage bin.

[0009] Preferably, a sealing cover is provided at the top of the storage bin. The threaded sleeve penetrates through the sealing cover and is slidably and sealingly connected to the sealing cover.

[0010] Preferably, the pressure sealing device includes a flange pipe, a support member, a reset member, a shunt member, and a piston member; the flange pipe is provided at the top of the pressure chamber, the support member is provided on the inner wall of the flange pipe, the bottom of the piston member is connected to the support member through the reset member, the shunt member is provided at the top port of the flange pipe, the top of the piston member abuts against the shunt member, and the shape of the piston member is adapted to the shape of the top port of the flange pipe.

[0011] Preferably, the flange pipe is spherical, and the inner diameter of the flange pipe is larger than the diameters of its upper port and lower port;

[0012] The support member includes a piston cylinder and a support beam. The support beam is provided on the side wall of the piston cylinder, and the piston cylinder is connected to the inner wall of the flange pipe through the support beam;

[0013] The reset member is an elastic member;

[0014] The piston member is circular, a seal is provided at the edge of the piston member, the outer diameter of the seal is adapted to the inner diameter of the upper port of the flange pipe, a through shaft is provided on the piston member, the through shaft below the piston member is inserted into the piston cylinder, the reset member is sleeved on the lower through shaft, and one end of the reset member abuts against the bottom of the piston member and the other end abuts against the top of the piston cylinder;

[0015] The shunt member is tubular, the top of the shunt member is connected to the upper port of the flange pipe through a connecting ring, a movable pipe is provided on the shunt member, the movable pipe is connected to the inner wall of the shunt member through a plurality of shunt vanes, and the through shaft above the piston member is movably connected to the movable pipe.

[0016] Preferably, the pressure chamber is hemispherical, the discharge device is located at the bottom of the pressure chamber, and the discharge device includes a plurality of sealing plates and a transmission ring; a plurality of first slide grooves and pressure relief holes are provided at the bottom of the pressure chamber, the sealing plate is arranged in the first slide groove, the transmission ring is arranged on the outer bottom surface of the pressure chamber, and a second slide groove is provided on the transmission ring, and the bottom surface of the sealing plate is connected to the transmission ring through a slider.

[0017] Preferably, the sealing plate is triangular, the bottom edge of the sealing plate is slidably connected to the first slide groove through a slide bar, the other two side edges of the sealing plate are respectively slidably and sealingly connected to the side edges of the adjacent sealing plates, a through hole is provided at the center of the transmission ring, the through hole is adapted to the size and shape of the pressure relief hole, and the transmission ring is connected to the bottom axis of the pressure chamber.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] After installing this flat valve, open the gate through the valve stem. During the opening process, the liquid will enter the interior of the valve seat and remain in the valve seat. Continue to rotate the valve stem to completely open the gate. At this time, the pressure chamber is in a sealed state, the pressure sealing device is not opened, and the liquid still remains in the valve seat. When the gate is fully opened, rotate the discharge device to connect the pressure chamber with the outside air, and release the sealing state of the pressure chamber. At this time, the liquid remaining in the valve seat will flow from the pressure sealing device into the pressure chamber and be discharged through the discharge device. When no more liquid is discharged, close the discharge device to restore the pressure chamber to a sealed state. The principle is the same when closing this flat valve. After the gate is completely closed, open the discharge device for discharge. According to user needs, the discharge device can be opened for a long time until the liquid accumulated in the valve seat has dried up, and then close the discharge device, so as to further ensure that the service life of this flat valve can be effectively extended. Through the design of the above structure, there will be no water accumulation in the valve seat, thereby avoiding the corrosion of the valve seat and the gate by the accumulated liquid, and improving the service life of the flat valve. When opening and closing the gate, because there is no liquid in the valve seat, the liquid will first fill the valve seat and then be transported, which can effectively reduce the water hammer effect when opening and closing the gate, thereby improving the service life of the terminal water-using equipment.

[0020] The flat valve structure of the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a cross-sectional view of the flat valve structure according to the present invention.

[0023] Figure 2 This is a schematic diagram of the flat valve structure according to the present invention when the pressure sealing device is not opened.

[0024] Figure 3 This is a schematic diagram of the flat valve structure according to the present invention when the pressure sealing device is opened.

[0025] Figure 4 This is a schematic structural diagram of the bleed-off device in the flat valve structure according to the present invention.

[0026] In the figure: 1 gate valve, 2 valve seat, 3 valve stem, 4 pressure chamber, 41 first chute, 42 pressure relief hole, 5 pressure sealing device, 51 flange pipe, 52 support member, 521 piston cylinder, 522 support beam, 53 reset member, 54 flow dividing member, 541 movable pipe, 542 flow dividing blade, 55 piston member, 551 blocking member, 552 through shaft, 6 bleed-off device, 61 sealing plate, 62 transmission ring, 621 second chute, 63 slider, 7 sleeve. Detailed implementation manners

[0027] The following further describes the present invention in detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it according to the description in the specification.

[0028] It should be understood that the terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0029] As Figures 1-4 shown, the present invention provides a flat valve structure, including: a gate valve 1, a valve seat 2 and a valve stem 3; the gate valve 1 is arranged in the valve seat 2, and the top of the gate valve 1 is connected to the bottom of the valve stem 3, the valve stem 3 is arranged on the top of the valve seat 2, a pressure chamber 4 is arranged at the bottom of the valve seat 2, and the top of the pressure chamber 4 can be in contact with the bottom of the gate valve 1 through a pressure sealing device 5, and a bleed-off device 6 is arranged at the bottom of the pressure chamber 4.

[0030] The working principle and beneficial effects of the above technical solution are as follows: after the installation of the flat valve, the gate 1 is opened by the valve stem 3. During the opening process, the liquid will enter the interior of the valve seat 2 and remain in the valve seat 2. The valve stem 3 is continuously rotated to completely open the gate 1. At this time, the pressure chamber 4 is in a sealed state, the pressure sealing device 5 is not opened, and the liquid still remains in the valve seat 2. When the gate 1 is fully opened, the leakage device 6 is rotated to connect the pressure chamber 4 with the outside air, and the sealing state of the pressure chamber 4 is released. At this time, the liquid remaining in the valve seat 2 will flow from the pressure sealing device 5 into the pressure chamber 4 and be discharged through the leakage device 6. When no more liquid is discharged, the leakage device 6 is closed to restore the pressure chamber 4 to a sealed state. The principle is the same when closing the flat valve. After the gate 1 is completely closed, the leakage device 6 can be opened for leakage. According to user needs, the leakage device 6 can be opened for a long time until the liquid accumulated in the valve seat 2 has been completely dried in the shade, and then the leakage device 6 is closed, so as to further ensure that the service life of the flat valve can be effectively extended. Through the design of the above structure, there will be no water accumulation in the valve seat 2, thereby avoiding the corrosion of the valve seat 2 and the gate 1 by the accumulated liquid, thereby improving the service life of the flat valve, and when opening and closing the gate 1, because there is no liquid in the valve seat 2, the liquid will first fill the valve seat 2 and then be transported, which can effectively reduce the water hammer effect when opening and closing the gate 1, thereby improving the service life of the terminal water-using equipment.

[0031] In one embodiment, the valve seat 2 includes a water inlet, a water outlet, a water storage bin and a receiving bin; the water inlet is connected to the water outlet, the water storage bin and the receiving bin are located in the same vertical direction, and the gate plate 1 passes through the receiving bin and the water storage bin, the pressure chamber 4 is arranged below the water storage bin, and the pressure chamber 4 is connected to the water storage bin through the pressure sealing device 5. The gate plate 1 is a flat gate, and a flow hole is arranged on the gate plate 1, and the flow hole can be moved into the water storage bin, and the water inlet is connected to the water outlet through the flow hole. A sleeve 7 is arranged at the connection between the water inlet and the water outlet, and the gate plate 1 passes through the sleeve 7 and is connected to the sleeve 7 in a sliding and sealing manner. The valve stem 3 is a threaded tube, and is connected to the top of the gate plate 1 through a threaded sleeve, and the threaded sleeve passes through the top of the receiving bin and is connected to the receiving bin in a sliding and sealing manner. A sealing cover is arranged at the top of the receiving bin, and the threaded sleeve passes through the sealing cover and is connected to the sealing cover in a sliding and sealing manner.

[0032] Working principle and beneficial effects of the above technical solution: Through the design of the above structure, the water inlet end and the water outlet end of the valve seat 2 are used for the inlet and outlet of liquid. When the valve stem 3 rotates, it will drive the threaded sleeve to move up and down, and then the gate plate 1 can move up and down. When the gate plate 1 is fully opened until the flow hole is communicated with the water inlet end and the water outlet end, the gate plate 1 for sealing above the flow hole is located in the storage bin. When the gate plate 1 moves downward, the flow hole will be completely received in the water storage bin. The sleeve is used to seal the gate plate 1 to prevent the gate plate 1 from leaking water.

[0033] In one embodiment, the pressure sealing device 5 includes a flange pipe 51, a support member 52, a reset member 53, a shunt member 54 and a piston member 55; the flange pipe 51 is arranged at the top of the pressure chamber 4, the support member 52 is arranged on the inner wall of the flange pipe 51, the bottom of the piston member 55 is connected with the support member 52 through the reset member 53, the shunt member 54 is arranged at the top port of the flange pipe 51, the top of the piston member 55 abuts against the shunt member 54, and the shape of the piston member 55 is adapted to the shape of the top port of the flange pipe 51. The flange pipe 51 is spherical, and the inner diameter of the flange pipe 51 is larger than the diameters of its upper port and lower port; the support member 52 includes a piston cylinder 521 and a support beam 522, the support beam 522 is arranged on the side wall of the piston cylinder 521, and the piston cylinder 521 is connected with the inner wall of the flange pipe 51 through the support beam 522; the reset member 53 is an elastic member; the piston member 55 is circular, a seal 551 is arranged at the edge of the piston member 55, the outer diameter of the seal 551 is adapted to the inner diameter of the upper port of the flange pipe 51, a through shaft 552 is arranged on the piston member 55, the through shaft 552 below the piston member 55 is inserted into the piston cylinder 521, the reset member 53 is sleeved on the lower through shaft 552, and one end of the reset member 53 abuts against the bottom of the piston member 55 and the other end abuts against the top of the piston cylinder 521; the shunt member 54 is tubular, the top of the shunt member 54 is connected with the upper port of the flange pipe 51 through a connecting ring, a movable pipe 541 is arranged on the shunt member 54, the movable pipe 541 is connected with the inner wall of the shunt member 54 through a plurality of shunt vanes 542, and the through shaft 552 above the piston member 55 is movably connected with the movable pipe 541.

[0034] Working principle and beneficial effects of the above technical solution: When the pressure chamber 4 is in a sealed state, under the action of the reset member 53, the piston member 55 is pushed up to seal the upper port of the flange pipe 51, and the baffle 551 will be inserted between the upper port of the flange pipe 51 and the flow dividing blade 542 to complete the sealing and fixing. When the water storage chamber is filled with liquid, the air pressure in the pressure chamber 4 and the reset member 53 will keep the piston member 55 sealed. At the same time, after the liquid in the water storage chamber passes through the flow dividing blade 542, it will squeeze the inner wall of the elastic baffle 551 to keep it in contact with the inner wall of the upper port of the flange pipe 51, thereby achieving the sealing effect. When the pressure chamber 4 is opened, the gravity of the liquid in the water storage chamber will drive the piston member 55 to move downward, so that the water storage chamber and the pressure chamber 4 are connected. The through shaft 552 can provide a limiting function for the movement of the piston member 55. When the liquid is discharged from the water storage chamber to the pressure chamber 4, gas-liquid exchange can be carried out in the spherical flange pipe 51. The flow dividing blade 542 and the support beam 522 can achieve the liquid flow dividing effect and break the rising bubbles, increasing the continuity of gas-liquid exchange and accelerating the discharge speed of the liquid in the water storage chamber. The support beam 522 is radially arranged outside the piston cylinder 521, which plays a role in supporting the piston cylinder 521 and breaking the rising bubbles while carrying out the flow division. Through the design of the above structure, the sealing effect of the water storage chamber can be realized when the pressure chamber 4 is closed, and gas can enter the water storage chamber conveniently during the drainage operation, avoiding the generation of negative pressure in the water storage chamber and effectively improving the drainage rate.

[0035] In one embodiment, the pressure chamber 4 is hemispherical, the drainage device 6 is located at the bottom of the pressure chamber 4, and the drainage device 6 includes a plurality of sealing plates 61 and a transmission ring 62; a plurality of first chutes 41 and pressure relief holes 42 are provided at the bottom of the pressure chamber 4, the sealing plates 61 are arranged in the first chutes 41, the transmission ring 62 is arranged on the outer bottom surface of the pressure chamber 4, and a second chute 621 is provided on the transmission ring 62. The bottom surface of the sealing plate 61 is connected to the transmission ring 62 through a slider 63. The sealing plate 61 is triangular, the bottom edge of the sealing plate 61 is slidably connected to the first chute 41 through a slide bar, and the other two sides of the sealing plate 61 are respectively slidably and sealedly connected to the sides of the adjacent sealing plates 61. A through hole is provided at the center of the transmission ring 62, and the size and shape of the through hole are adapted to those of the pressure relief hole 42. The transmission ring 62 is axially connected to the bottom surface of the pressure chamber 4.

[0036] Working principle and beneficial effects of the above technical solution: Through the design of the above structure, the pressure chamber 4 is hemispherical, which can better drain the liquid when draining. When preparing to drain, rotate the transmission ring 62, and the transmission ring 62 will drive the slider 63 inside it to translate through the second chute 621. When the slider 63 translates, it will drive the sealing plate 61 to slide along the first chute 41. Since all the sealing plates 61 are driven by the transmission ring 62, all the sealing plates 61 have the same moving speed, so that when the transmission ring 62 is rotated, two adjacent sealing plates 61 can be separated or approached simultaneously, thereby realizing the opening and closing effects of the pressure relief holes 42. The sides of two adjacent sealing plates 61 are all connected by sliding seals. After all the sealing rings 61 are closed, the pressure relief holes 42 will be completely sealed, thus realizing the sealing of the pressure chamber 4. According to the different rotation angles of the transmission ring 62, the opening diameters of the sealing plates 61 are different, thereby realizing the control of the air entering the pressure chamber 4 and the control of the drainage flow rate. At the same time, the screwing rotation method is convenient for users to switch the flow discharge device 6 without tools.

[0037] In one embodiment, in order to maintain the sealed state, the reset member 53 should be able to provide at least a supporting force ; The value range of the supporting force F is as follows

[0038]

[0039] Among them, is the hydrodynamic force during the opening process of the gate plate 1; is the axial force caused by the liquid backflow pressure difference;

[0040] Among them can be calculated respectively by the following formulas

[0041]

[0042] Among them, is the flow area of the liquid passing through the flow hole during the rising opening or closing process of the gate plate 1; is the flow coefficient of the liquid; is the velocity coefficient of the liquid; is the pressure drop at the flow hole of the gate plate 1; is the flow angle of the liquid passing through the flow hole on the gate plate 1.

[0043]

[0044] Among them, is the pressure difference between the liquids at both ends of the gate plate 1; R is the diameter of the flow hole on the gate plate 1; is the density of the liquid; is the resistance coefficient of the flow hole of the gate plate 1; is the flow rate through the flow holes on the gate plate 1; is the cross-sectional area of the flow holes.

[0045] Through the above formula, when the gate plate 1 is in the process of opening or closing, in order to keep the piston part 55 sealed, the support force F that the reset part 53 should be able to provide at least can be calculated, and by back-calculating according to the support force F, through the formula

[0046]

[0047] wherein, is the deformation amount of the reset part 53. It can be known that in order to ensure the sealing effect during the opening and closing process of the gate plate 1, the reset part 53 should be able to provide at least of the deformation amount;

[0048] Before assembling this flat valve, the corresponding reset part 53 should be calculated and selected according to the formula first, so as to ensure that during the opening and closing process of the gate plate 1, the reset part 53 can provide sufficient support force, thereby maintaining the sealing effect of the piston part 55, and then improving the yield rate of the produced flat valve and avoiding the situation of water leakage of the flat valve caused by excessive water pressure during use.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0050] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and the examples shown and described herein.

Claims

1. A flat valve structure, characterized in that, Comprising: A gate plate (1), a valve seat (2) and a valve stem (3); the gate plate (1) is arranged inside the valve seat (2), and the top of the gate plate (1) is connected to the bottom of the valve stem (3), the valve stem (3) is arranged on the top of the valve seat (2), a pressure chamber (4) is arranged at the bottom of the valve seat (2), and the top of the pressure chamber (4) can abut against the bottom of the gate plate (1) through a pressure sealing device (5), and a flow discharging device (6) is arranged at the bottom of the pressure chamber (4); The valve seat (2) includes a water inlet end, a water outlet end, a water storage bin and a storage bin; the water inlet end is communicated with the water outlet end, the water storage bin and the storage bin are in the same vertical direction, and the gate plate (1) penetrates through the storage bin and the water storage bin, the pressure chamber (4) is arranged below the water storage bin, and the pressure chamber (4) is communicated with the water storage bin through the pressure sealing device (5); The pressure sealing device (5) includes a flange pipe (51), a support member (52), a reset member (53), a flow dividing member (54) and a piston member (55); the flange pipe (51) is arranged on the top of the pressure chamber (4), the support member (52) is arranged on the inner wall of the flange pipe (51), the bottom of the piston member (55) is connected to the support member (52) through the reset member (53), the flow dividing member (54) is arranged at the top port of the flange pipe (51), the top of the piston member (55) abuts against the flow dividing member (54), and the shape of the piston member (55) is adapted to the shape of the top port of the flange pipe (51); The flange pipe (51) is spherical, and the inner diameter of the flange pipe (51) is larger than the diameters of its upper port and lower port; The support member (52) includes a piston cylinder (521) and a support beam (522), the support beam (522) is arranged on the side wall of the piston cylinder (521), and the piston cylinder (521) is connected to the inner wall of the flange pipe (51) through the support beam (522); The reset member (53) is an elastic member; The piston member (55) is circular, a seal (551) is arranged at the edge of the piston member (55), the outer diameter of the seal (551) is adapted to the inner diameter of the upper port of the flange pipe (51), a through shaft (552) is arranged on the piston member (55), the through shaft (552) below the piston member (55) is inserted into the piston cylinder (521), the reset member (53) is sleeved on the through shaft (552) below, and one end of the reset member (53) abuts against the bottom of the piston member (55), and the other end abuts against the top of the piston cylinder (521); The shunt member (54) is tubular. The top of the shunt member (54) is connected to the upper port of the flange pipe (51) through a connecting ring. An active pipe (541) is provided on the shunt member (54). The active pipe (541) is connected to the inner wall of the shunt member (54) through a plurality of shunt vanes (542). The through shaft (552) above the piston member (55) is movably connected to the active pipe (541).

2. The flat valve structure according to claim 1, characterized in that, The gate plate (1) is a flat gate. A flow-through hole is provided on the gate plate (1). The flow-through hole can be moved into the water storage bin. The water inlet end and the water outlet end are communicated through the flow-through hole.

3. The flat valve structure according to claim 2, characterized in that, A sleeve (7) is provided at the connection of the water inlet end and the water outlet end. The gate plate (1) penetrates through the sleeve (7) and is slidably and sealingly connected to the sleeve (7).

4. The flat valve structure according to claim 1, characterized in that The valve rod (3) is a threaded pipe and is connected to the top of the gate plate (1) through a threaded sleeve. The threaded sleeve penetrates through the top of the storage bin and is slidably and sealingly connected to the storage bin.

5. The flat valve structure according to claim 4, wherein A sealing cover is provided at the top of the storage bin. The threaded sleeve penetrates through the sealing cover and is slidably and sealingly connected to the sealing cover.

6. The flat valve structure according to claim 1, characterized in that, The pressure chamber (4) is hemispherical. The flow discharge device (6) is located at the bottom of the pressure chamber (4). The flow discharge device (6) includes a plurality of sealing plates (61) and a transmission ring (62). A plurality of first chutes (41) and pressure relief holes (42) are provided at the bottom of the pressure chamber (4). The sealing plates (61) are arranged in the first chutes (41). The transmission ring (62) is arranged on the outer bottom surface of the pressure chamber (4). And a second chute (621) is provided on the transmission ring (62). The bottom surface of the sealing plate (61) is connected to the transmission ring (62) through a slider (63).

7. The flat valve structure according to claim 6, characterized in that, The sealing plate (61) is triangular. The bottom edge of the sealing plate (61) is slidably connected to the first chute (41) through a slide bar. The other two sides of the sealing plate (61) are respectively slidably and sealingly connected to the sides of the adjacent sealing plates (61). A through hole is provided at the center of the transmission ring (62). The size and shape of the through hole are adapted to those of the pressure relief hole (42). The transmission ring (62) is axially connected to the bottom surface of the pressure chamber (4).

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