Flat gate valve capable of reducing torque

Abstract

The invention relates to the field of flat gate valves, and provides a torque-reducing flat gate valve which comprises a valve body, a threaded rod, a valve cover, a support and a rotating handle, a pressing piece is slidably connected to the inner wall of a transmission groove and extends out of the rotating handle, the pressing piece is connected with the inner wall of the transmission groove through a second elastic piece, and an L-shaped piece is fixedly connected to the inner wall of the transmission groove; first air bags are fixedly connected to the L-shaped pieces, a limiting rod is slidably connected to the inner wall of the transmission cavity, a lifting piece and a baffle are fixedly connected to the limiting rod, two second air bags fixedly connected with each other are arranged in the transmission cavity, the two second air bags are connected with the two first air bags through air conveying pipes correspondingly, and the upper second air bag is fixedly connected with the bottom wall of the lifting piece. The lower second air bag is fixedly connected with the bottom wall of the transmission cavity, two or more limiting grooves are formed in the top wall of the support, and the agent storage cavity is filled with lubricating agents. According to the invention, before a user rotates the rotating handle, a lubricant can be automatically added to the threaded rod and the rotating handle, so that the torque required for rotating the rotating handle is reduced.

Description

Technical Field

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

[0002] As an important valve widely used in the petroleum, chemical, natural gas and other industries, the main function of the flat gate valve is to achieve full opening or closing of the medium by controlling the gate. However, in practical applications, the traditional flat gate valve has the problem of excessive opening and closing torque, which is particularly evident in large-diameter high-pressure valves.

[0003] Lubricating the switch assembly can reduce the opening and closing torque of the flat gate valve to a certain extent, but currently it requires manual addition of lubricant, which is rather troublesome. Summary of the invention

[0004] In view of the above technical problems, the present invention aims to provide a flat gate valve with reduced torque. To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A flat gate valve for reducing torque, comprising a valve body, a threaded rod, a valve cover, a support and a rotating handle, wherein the valve cover is fixedly connected to the top wall of the valve body, the support is fixedly connected to the top wall of the valve cover, the rotating handle is rotatably connected to the top wall of the support, a threaded hole is provided on the rotating handle, the threaded rod is rotatably connected to the valve body, the upper end of the threaded rod extends above the rotating handle, and the threaded rod is threadedly connected to the inner wall of the threaded hole;

[0006] The turning handle is provided with a transmission chamber, a storage chamber and two transmission grooves, the inner wall of the transmission groove is slidably connected with a pressing piece, the pressing piece extends to the outside of the turning handle, the pressing piece is connected to the inner wall of the transmission groove through a second elastic piece, the inner wall of the transmission groove is fixedly connected with an L-shaped piece, the L-shaped piece is fixedly connected with a first air bag, the inner wall of the transmission chamber is slidably connected with a limit rod, the limit rod is fixedly connected with a lifting plate and a baffle, two second air bags fixed to each other are provided in the transmission chamber, the two second air bags are respectively connected to the two first air bags through air pipes, the upper second air bag is fixedly connected to the bottom wall of the lifting plate, the lower second air bag is fixedly connected to the bottom wall of the transmission chamber, the top wall of the support is provided with two or more limit grooves, the limit rod extends into one of the limit grooves, the agent storage chamber is connected with the inner wall of the threaded hole through the agent passage, the agent storage chamber is filled with lubricant, the top wall of the baffle extends into the agent storage chamber, the baffle is provided with perforations, and the baffle is slidably connected to the inner wall of the agent storage chamber.

[0007] Preferably, a valve cavity is provided on the valve body, the valve cavity is connected with the outer wall of the valve body through an inlet channel, the valve cavity is connected with the outer wall of the valve body through an outlet channel, the seat body is fixedly connected to the inner wall of the valve cavity, a seat channel is provided on the seat body, the valve plate is slidably connected to the inner wall of the seat channel, the top wall of the valve plate extends into the valve plate, and the lower end of the threaded rod is fixedly connected to the top wall of the valve plate.

[0008] Preferably, a display device is fixedly connected to the valve cover.

[0009] Preferably, a fixed cylinder is inlaid on the valve plate, a cylinder cavity is opened on the fixed cylinder, a piston body is slidably connected to the inner wall of the cylinder cavity, a piston rod is fixedly connected to the bottom wall of the piston body, and the lower end of the piston rod is fixedly connected to the bottom wall of the seat channel;

[0010] The display device is provided with a display chamber and an alarm chamber, the side wall of the display chamber is connected with the top wall of the cylinder chamber through a liquid pipe, a glass plate is inlaid between the top wall of the display chamber and the top wall of the display device, the display chamber is filled with display liquid, a movable display block is slidably connected with the inner wall of the display chamber, the bottom wall of the movable display block is inlaid with a first permanent magnet, the bottom wall of the display liquid is connected with the top wall of the alarm chamber through a connecting channel, a partition is fixedly connected with the inner wall of the connecting channel, the second permanent magnet is slidably connected with the inner wall of the connecting channel, a limit plate, a damping block, a fifth permanent magnet and a sounding bell are fixedly connected with the inner wall of the alarm chamber, a slider is slidably connected with the inner wall of the alarm chamber, the slider and the damping block are abutted against each other, a third permanent magnet is fixedly connected with the top wall of the slider, a fourth permanent magnet is slidably connected with the bottom wall of the slider, the fourth permanent magnet is connected with a protrusion through a first elastic member, the protrusion is fixedly connected to the bottom wall of the slider, a hanging rope is fixedly connected with the bottom wall of the fourth permanent magnet, and a collision member is fixedly connected with the lower end of the hanging rope.

[0011] Preferably, the alarm cavity is communicated with the outer wall of the display device.

[0012] Preferably, the spacer is made of non-magnetic shielding material.

[0013] Preferably, the collision member and the sounding bell are both made of metal.

[0014] Preferably, the display liquid is non-transparent in color.

[0015] Preferably, the valve body material includes one of carbon steel, stainless steel or duplex steel.

[0016] Preferably, the outer wall of the valve body is coated with an anti-corrosion coating, and the anti-corrosion coating includes epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and epoxy topcoat.

[0017] The present invention has the following beneficial effects:

[0018] The present invention can prevent others from accidentally touching the turning handle and causing the turning handle to rotate, thereby wasting medium, through the transmission setting between the limiting rod and the two pressing parts. It can also automatically add lubricant to the threaded rod and the turning handle before the user turns the turning handle to reduce the torque required to rotate the turning handle. It can also automatically release the limiting groove from limiting the limiting rod to facilitate the user to rotate the turning handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0020] Figure 1 It is a structural schematic diagram of a flat gate valve for reducing torque according to the present invention;

[0021] Figure 2 The present invention Figure 1 Schematic diagram of the structure of the valve body and valve cover;

[0022] Figure 3 The present invention Figure 1 The enlarged view of point A in the middle;

[0023] Figure 4 The present invention Figure 1 The enlarged view of point B in the middle;

[0024] Figure 5 The present invention Figure 1 Enlarged view of point C in the middle;

[0025] Figure 6 The present invention Figure 1 The enlarged view of point D in the middle;

[0026] Figure 7 The present invention Figure 3 Enlarged view of point E in the middle.

[0027] Figure numerals: 1, valve body; 2, water inlet channel; 3, water outlet channel; 4, valve cavity; 5, seat body; 6, seat channel; 7, valve plate; 8, threaded rod; 9, valve cover; 10, support; 11, turning handle; 12, threaded hole; 13, display device; 14, fixed cylinder; 15, cylinder cavity; 16, piston body; 17, piston rod; 18, liquid pipe; 19, display cavity; 20, display liquid; 21, glass plate; 22, movable display block; 23, first permanent magnet; 24, connecting channel; 25, alarm cavity; 26, diaphragm; 27, second permanent magnet; 28, limit plate ; 29. ​​The third permanent magnet; 30. The damping block; 31. The slider; 311. The protrusion; 32. The fourth permanent magnet; 33. The first elastic member; 34. The collision member; 35. The suspension rope; 36. The fifth permanent magnet; 37. The sounding bell; 38. The transmission groove; 39. The pressing member; 40. The second elastic member; 41. The L-shaped piece; 42. The first airbag; 43. The transmission cavity; 44. The air pipe; 45. The second airbag; 46. The limiting rod; 47. The lifting piece; 48. The baffle; 49. The perforation; 50. The limiting groove; 51. The agent storage cavity; 52. The agent passage; 53. The lubricant. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", etc., indicating the orientation or positional relationship, are 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 cannot be understood as limiting the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-Figure 7 As shown, a flat gate valve for reducing torque includes a valve body 1, a threaded rod 8, a valve cover 9, a support 10 and a rotating handle 11, the valve cover 9 is fixed to the top wall of the valve body 1, the support 10 is fixed to the top wall of the valve cover 9, the rotating handle 11 is rotatably connected to the top wall of the support 10, a threaded hole 12 is opened on the rotating handle 11, the threaded rod 8 is rotatably connected to the valve body 1, the upper end of the threaded rod 8 extends to the top of the rotating handle 11, and the threaded rod 8 is threadedly connected to the inner wall of the threaded hole 12;

[0032] The rotating handle 11 is provided with a transmission cavity 43, a storage cavity 51 and two transmission grooves 38. The inner wall of the transmission groove 38 is slidably connected with a pressing member 39, which extends to the outside of the rotating handle 11. The pressing member 39 is connected to the inner wall of the transmission groove 38 through a second elastic member 40. The inner wall of the transmission groove 38 is fixedly connected with an L-shaped piece 41, and the L-shaped piece 41 is fixedly connected with a first airbag 42. The inner wall of the transmission cavity 43 is slidably connected with a limit rod 46, and the limit rod 46 is fixedly connected with a lifting sheet 47 and a baffle 48. Two second airbags 45 fixed to each other are provided in the transmission cavity 43. The two second airbags 45 It is connected to the two first air bags 42 respectively through the air delivery pipe 44, the upper second air bag 45 is fixedly connected to the bottom wall of the lifting plate 47, the lower second air bag 45 is fixedly connected to the bottom wall of the transmission chamber 43, the top wall of the support 10 is provided with two or more limit grooves 50, the limit rod 46 extends into one of the limit grooves 50, the agent storage chamber 51 is connected with the inner wall of the threaded hole 12 through the agent passage 52, the agent storage chamber 51 is filled with lubricant 53, the top wall of the baffle plate 48 extends into the agent storage chamber 51, the baffle plate 48 is provided with a through hole 49, and the baffle plate 48 and the inner wall of the agent storage chamber 51 are slidably connected.

[0033] The valve body 1 is the main structure, the threaded rod 8 is used to move up and down to control the opening and closing of the flat gate valve, the valve cover is used to protect the valve body 1, the handle 11 can be set as a hand wheel, the first air bag 42 and the second air bag 45 are filled with gas, and the gas can be transmitted through the gas pipe 44.

[0034] According to an optional embodiment of the present invention, a valve cavity 4 is provided on the valve body 1, the valve cavity 4 is connected to the outer wall of the valve body 1 through the water inlet channel 2, the valve cavity 4 is connected to the outer wall of the valve body 1 through the water outlet channel 3, the seat body 5 is fixedly connected to the inner wall of the valve cavity 4, the seat body 5 is provided with a seat channel 6, the valve plate 7 is slidably connected to the inner wall of the seat channel 6, the top wall of the valve plate 7 extends into the valve plate 7, and the lower end of the threaded rod 8 is fixedly connected to the top wall of the valve plate 7. The medium enters the valve body 1 from the water inlet channel 2 and leaves the valve body 1 from the water outlet channel 3, and the valve plate 7 is used for the opening and closing of the flat gate valve.

[0035] According to an optional embodiment of the present invention, a display device 13 is fixedly connected to the valve cover 9. The display device 13 is used to display the opening and closing degree of the flat gate valve.

[0036] According to an optional embodiment of the present invention, a fixed cylinder 14 is embedded on the valve plate 7, a cylinder cavity 15 is opened on the fixed cylinder 14, a piston body 16 is slidably connected to the inner wall of the cylinder cavity 15, a piston rod 17 is fixedly connected to the bottom wall of the piston body 16, and the lower end of the piston rod 17 is fixedly connected to the bottom wall of the seat channel 6;

[0037] The display device 13 is provided with a display chamber 19 and an alarm chamber 25. The side wall of the display chamber 19 is connected to the top wall of the barrel chamber 15 through a liquid pipe 18. A glass plate 21 is inlaid between the top wall of the display chamber 19 and the top wall of the display device 13. The display chamber 19 is filled with a display liquid 20. A movable display block 22 is slidably connected to the inner wall of the display chamber 19. The bottom wall of the movable display block 22 is inlaid with a first permanent magnet 23. The bottom wall of the display liquid 20 is connected to the top wall of the alarm chamber 25 through a connecting channel 24. A spacer 26 is fixed to the inner wall of the connecting channel 24. The inner wall of the connecting channel 24 is slidably connected to the display liquid 20. There is a second permanent magnet 27, and the inner wall of the alarm cavity 25 is fixed with a limit plate 28, a damping block 30, a fifth permanent magnet 36 and a sounding bell 37. The inner wall of the alarm cavity 25 is slidably connected with a slider 31, and the slider 31 and the damping block 30 are against each other. The top wall of the slider 31 is fixed with a third permanent magnet 29, and the bottom wall of the slider 31 is slidably connected with a fourth permanent magnet 32. The fourth permanent magnet 32 ​​is connected to the protrusion 311 through the first elastic member 33, and the protrusion 311 is fixed to the bottom wall of the slider 31. The bottom wall of the fourth permanent magnet 32 ​​is fixed with a hanging rope 35, and the lower end of the hanging rope 35 is fixed with a collision member 34.

[0038] Two damping blocks 30 can be provided to clamp the slider 31 . The suspension rope 35 is a soft rope to facilitate the swing of the collision member 34 . The collision member 34 can be set to a spherical shape to facilitate the ringing of the sounding bell 37 .

[0039] According to an optional implementation of the present invention, the alarm cavity 25 is communicated with the outer wall of the display device 13 to facilitate the transmission of sound to the outside.

[0040] According to an optional implementation of the present invention, the spacer 26 is made of a non-magnetic shielding material to facilitate the first permanent magnet 23 to perform magnetic transmission on the second permanent magnet 27 .

[0041] According to an optional implementation of the present invention, the collision member 34 and the sounding bell 37 are both made of metal.

[0042] According to an optional implementation of the present invention, the display liquid 20 is in a non-transparent color to facilitate users to observe the amount of the display liquid 20 .

[0043] According to an optional embodiment of the present invention, the valve body 1 is made of one of carbon steel, stainless steel or duplex steel. Carbon steel is suitable for general media such as water, oil, steam, etc. Stainless steel has an anti-corrosion function, and duplex steel has better corrosion resistance and strength than stainless steel, and is suitable for harsher chemical media environments.

[0044] According to an optional embodiment of the present invention, the outer wall of the valve body 1 is coated with an anti-corrosion coating, and the anti-corrosion coating includes epoxy zinc-rich primer, epoxy micaceous iron intermediate paint and epoxy topcoat.

[0045] The epoxy zinc-rich primer is a two-component paint made of modified epoxy resin, zinc powder and auxiliary components, and is used to provide long-term cathodic protection for the valve body 1.

[0046] The epoxy micaceous iron intermediate paint contains a substance arranged in a phosphorus flake shape, which reduces the water vapor permeability of the coating, prevents the corrosive medium from entering the outer wall of the valve body 1, and plays a waterproof role.

[0047] Epoxy topcoat has outstanding water resistance, corrosion resistance and physical properties, and can play a waterproof and anti-corrosion role for many years. Nano-scale silicon carbide particles can be added to epoxy topcoat to enhance wear resistance and make the coating denser, thereby improving strength and toughness.

[0048] Implementation process:

[0049] When the flat gate valve is not in use, the limiting rod 46 is inserted into one of the limiting grooves 50 to limit the handle 11, so as to prevent others or other external forces from accidentally touching the handle 11, causing the handle 11 to open and waste the medium.

[0050] When the flat gate valve is needed, the handle 11 is held with both hands, and the two pressing members 39 are held at the same time. The pressing member 39 overcomes the elastic force of the second elastic member 40 and moves toward the L-shaped piece 41 to squeeze the first airbag 42. The pressing member 39 stops moving after it moves to contact the L-shaped piece 41. After the first airbag 42 is squeezed, the air in the first airbag 42 enters the second airbag 45 through the air pipe 44, and the two second airbags 45 expand, thereby pushing the lifting piece 47 upward, so that the limit rod 46 and the baffle plate 48 moves upward, the limiting rod 46 is disengaged from the limiting groove 50, and the through hole 49 is connected with the agent flow channel 52, so that part of the lubricant 53 in the agent storage chamber 51 passes through the through hole 49 and the agent flow channel 52 and flows to the threaded rod 8 and the turning handle 11. The lubricant 53 can not only lubricate the relative movement between the inner wall of the threaded hole 12 and the threaded rod 8, but also lubricate the relative movement between the turning handle 11 and the support 10, thereby reducing the torque required to rotate the turning handle 11, allowing the user to turn the turning handle 11 more effortlessly.

[0051] Two pressing pieces 39 must be pressed to connect the perforation 49 and the dosage passage 52. If only one pressing piece 39 is pressed, that is, only one second airbag 45 is inflated, the baffle 48 and the perforation 49 are not moved up enough, and the dosage passage 52 cannot be connected to the perforation 49. This can prevent others from accidentally touching one pressing piece 39 and causing the handle 11 to rotate, greatly reducing the possibility of the handle 11 rotating due to accidental touching.

[0052] When the handle 11 is rotated, since the threaded rod 8 and the inner wall of the threaded hole 12 are threadedly connected, the handle 11 will drive the threaded rod 8 to move upward, and the threaded rod 8 will drive the valve plate 7 to move upward, so that the medium can flow into the water inlet channel 2, pass through the seat channel 6, and then flow out from the water outlet channel 3. The upward movement degree of the valve plate 7 determines the opening and closing degree of the flat gate valve.

[0053] After the valve plate 7 moves upward, since the lower end of the piston rod 17 is fixedly connected to the bottom wall of the seat channel 6, the piston body 16 will move downward relative to the valve plate 7, and the piston body 16 will extract the display liquid 20 in the display cavity 19 into the cylinder cavity 15 through the liquid pipe 18. The movable display block 22 will move to the left as the display liquid 20 decreases. The user can judge the upward movement degree of the valve plate 7 according to the amount of the display liquid 20 or the position of the movable display block 22, and thus judge the opening and closing degree of the flat gate valve, so as to control the flow rate of the medium.

[0054] When the user needs to close the flat gate valve, the handle 11 can be reversed. When the valve plate 7 moves downward, the piston body 16 will move upward relative to the valve plate 7, thereby pushing the display liquid 20 back into the display chamber 19. The user can judge whether the valve plate 7 is completely closed by observing whether the movable display block 22 moves right and resets to the original position. Even if the user forgets to observe the position of the movable display block 22, the movable display block 22 is not completely reset by a short distance, that is, the valve plate 7 is not completely closed. At this time, the first permanent magnet 23 is located above the connecting channel 24, and the first permanent magnet 23 magnetically adsorbs the second permanent magnet 27. The second permanent magnet 27 moves upward to abut against the diaphragm 26. After the second permanent magnet 27 moves upward, the third permanent magnet 29 loses the magnetic adsorption of the second permanent magnet 27, and the third permanent magnet 29 and the slider 31 are in The fourth permanent magnet 32 ​​slowly moves downward under the action of its own gravity and the damping force of the damping block 30. When the fourth permanent magnet 32 ​​moves to the same horizontal plane as the fifth permanent magnet 36, the fourth permanent magnet 32 ​​is magnetically attracted by the fifth permanent magnet 36 to overcome the elastic force of the first elastic member 33 and move right. The hanging rope 35 and the collision member 34 move right. When the fourth permanent magnet 32 ​​moves below the fifth permanent magnet 36, the fourth permanent magnet 32 ​​loses the magnetic attraction of the fifth permanent magnet 36. The fourth permanent magnet 32 ​​quickly moves left and resets under the elastic force of the first elastic member 33. The collision member 34 will swing to the left and hit the sounding bell 37 to sound an alarm, thereby reminding the user that the valve plate 7 is not completely closed. After the sounding bell 37 rebounds, the collision member 34 will hit the sounding bell 37 multiple times, so that the sounding bell 37 continues to sound.

[0055] The function of the damping block 30 is to reduce the downward movement speed of the slider 31 to prevent the slider 31 from moving downward too quickly when the first permanent magnet 23 passes normally over the connecting channel 24, causing the sounding bell 37 to emit a false alarm. The sounding bell 37 will only emit a ringing sound when the first permanent magnet 23 stays above the connecting channel 24 for a period of time.

[0056] After the user releases the two pressing pieces 39, the two pressing pieces 39 will move back and reset under the elastic force of the second elastic piece 40, the two second airbags 45 will shrink, and the baffle 48 will re-block the liquid passage 52 to prevent the waste of lubricant 53. The limiting rod 46 is inserted into one of the limiting grooves 50 to limit the turning handle 11 to prevent others from accidentally touching it.

[0057] The present invention can prevent others from accidentally touching the handle 11 and causing the handle 11 to rotate and waste medium through the transmission setting between the limit rod 46 and the two pressing members 39. It can also automatically add lubricant 53 to the threaded rod 8 and the handle 11 before the user rotates the handle 11 to reduce the torque required to rotate the handle 11. It can also automatically release the limit of the limit groove 50 on the limit rod 46 to facilitate the user to rotate the handle 11. Through the setting of the display 13, the user can judge the opening and closing degree of the valve plate 7 by observing the display of the liquid 20 and the movable display block 22 on the display 13. In the operation of closing the valve plate 7, when the valve plate 7 is not completely closed, the sounding bell 37 can automatically emit a continuous ringing sound for alarm.

[0058] The components, modules, mechanisms and devices not described in detail in the present invention are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A flat gate valve for reducing torque, characterized in that: The valve comprises a valve body (1), a threaded rod (8), a valve cover (9), a support (10) and a rotating handle (11), wherein the valve cover (9) is fixedly connected to the top wall of the valve body (1), the support (10) is fixedly connected to the top wall of the valve cover (9), the rotating handle (11) is rotatably connected to the top wall of the support (10), a threaded hole (12) is provided on the rotating handle (11), the threaded rod (8) is rotatably connected to the valve body (1), the upper end of the threaded rod (8) extends above the rotating handle (11), and the threaded rod (8) is threadedly connected to the inner wall of the threaded hole (12); The rotating handle (11) is provided with a transmission cavity (43), a drug storage cavity (51) and two transmission grooves (38); the inner wall of the transmission groove (38) is slidably connected with a pressing piece (39); the pressing piece (39) extends outside the rotating handle (11); the pressing piece (39) is connected to the inner wall of the transmission groove (38) through a second elastic piece (40); the inner wall of the transmission groove (38) is fixedly connected with an L-shaped piece (41); the L-shaped piece (41) is fixedly connected with a first airbag (42); the inner wall of the transmission cavity (43) is slidably connected with a limit rod (46); the limit rod (46) is fixedly connected with a lifting piece (47) and a baffle (48); two second airbags (45) fixedly connected to each other are arranged in the transmission cavity (43); the two second airbags (45) are fixedly connected to each other. 5) are connected to the two first airbags (42) respectively through the air delivery pipe (44), the upper second airbag (45) is fixedly connected to the bottom wall of the lifting plate (47), and the lower second airbag (45) is fixedly connected to the bottom wall of the transmission chamber (43), the top wall of the support (10) is provided with two or more limit grooves (50), the limit rod (46) extends into one of the limit grooves (50), the agent storage chamber (51) is connected with the inner wall of the threaded hole (12) through the agent passage (52), the agent storage chamber (51) is filled with lubricant (53), the top wall of the baffle (48) extends into the agent storage chamber (51), the baffle (48) is provided with a through hole (49), and the baffle (48) and the inner wall of the agent storage chamber (51) are slidably connected.

2. A flat gate valve for reducing torque according to claim 1, characterized in that: The valve body (1) is provided with a valve cavity (4), the valve cavity (4) is connected to the outer wall of the valve body (1) through an inlet channel (2), the valve cavity (4) is connected to the outer wall of the valve body (1) through an outlet channel (3), the seat body (5) is fixedly connected to the inner wall of the valve cavity (4), the seat body (5) is provided with a seat channel (6), the valve plate (7) is slidably connected to the inner wall of the seat channel (6), the top wall of the valve plate (7) extends into the valve plate (7), and the lower end of the threaded rod (8) is fixedly connected to the top wall of the valve plate (7).

3. A flat gate valve for reducing torque according to claim 2, characterized in that: A display device (13) is fixedly connected to the valve cover (9).

4. A flat gate valve for reducing torque according to claim 3, characterized in that: The valve plate (7) is inlaid with a fixed cylinder (14), the fixed cylinder (14) is provided with a cylinder cavity (15), the inner wall of the cylinder cavity (15) is slidably connected with a piston body (16), the bottom wall of the piston body (16) is fixedly connected with a piston rod (17), and the lower end of the piston rod (17) is fixedly connected to the bottom wall of the seat channel (6); The display device (13) is provided with a display chamber (19) and an alarm chamber (25). The side wall of the display chamber (19) is connected to the top wall of the cylinder chamber (15) through a liquid pipe (18). A glass plate (21) is inlaid between the top wall of the display chamber (19) and the top wall of the display device (13). The display chamber (19) is filled with a display liquid (20). The inner wall of the display chamber (19) is slidably connected to a movable display block (22). The bottom wall of the movable display block (22) is inlaid with a first permanent magnet (23). The bottom wall of the display liquid (20) is connected to the top wall of the alarm chamber (25) through a connecting channel (24). A spacer (26) is fixedly connected to the inner wall of the connecting channel (24). The inner wall of the connecting channel (24) is slidably connected to a first permanent magnet (23). The alarm cavity (25) is provided with a second permanent magnet (27), a limit plate (28), a damping block (30), a fifth permanent magnet (36) and a sounding bell (37) fixedly connected to the inner wall of the alarm cavity (25), a slider (31) being slidably connected to the inner wall of the alarm cavity (25), the slider (31) and the damping block (30) being abutted against each other, a third permanent magnet (29) being fixedly connected to the top wall of the slider (31), a fourth permanent magnet (32) being slidably connected to the bottom wall of the slider (31), the fourth permanent magnet (32) being connected to the protrusion (311) through a first elastic member (33), the protrusion (311) being fixedly connected to the bottom wall of the slider (31), a hanging rope (35) being fixedly connected to the bottom wall of the fourth permanent magnet (32), and a collision member (34) being fixedly connected to the lower end of the hanging rope (35).

5. A flat gate valve for reducing torque according to claim 4, characterized in that: The alarm chamber (25) is in communication with the outer wall of the display device (13).

6. A flat gate valve for reducing torque according to claim 5, characterized in that: The spacer (26) is made of non-magnetic shielding material.

7. A flat gate valve for reducing torque according to claim 6, characterized in that: The collision member (34) and the sounding bell (37) are both made of metal.

8. A flat gate valve for reducing torque according to claim 7, characterized in that: The color of the display liquid (20) is non-transparent.

9. A flat gate valve for reducing torque according to any one of claims 1 to 8, characterized in that: The material of the valve body (1) includes one of carbon steel, stainless steel or duplex steel.

10. A flat gate valve for reducing torque according to claim 9, characterized in that: The outer wall of the valve body (1) is coated with an anti-corrosion coating, which comprises an epoxy zinc-rich primer, an epoxy micaceous iron intermediate paint and an epoxy topcoat.

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