A flat gate valve for reducing torque

Abstract

The present invention relates to the field of flat gate valves, and provides a flat gate valve with reduced torque, which includes a valve body, a threaded rod, a valve cover, a support and a turning handle. A pressing member is slidably connected to the inner wall of the transmission groove, and the pressing member extends outside the turning handle. The pressing member is connected to the inner wall of the transmission groove through a second elastic member. An L-shaped piece is fixedly connected to the inner wall of the transmission groove, and a first airbag is fixedly connected to the L-shaped piece. A limiting rod is slidably connected to the inner wall of the transmission cavity, and a lifting piece and a baffle are fixedly connected to the limiting rod. Two second airbags fixedly connected to each other are arranged in the transmission cavity, and the two second airbags are respectively connected to the two first airbags through air pipes. The upper second airbag is fixedly connected to the bottom wall of the lifting piece, and the lower second airbag is fixedly connected to the bottom wall of the transmission cavity. Two or more limiting grooves are formed in the top wall of the support, and a lubricant is filled in the storage cavity. The present invention can automatically add lubricant to the threaded rod and the turning handle before the user turns the turning handle, so as to reduce the torque required to turn the turning handle.

Description

Technical Field

[0001] The present invention relates to the technical field of flat gate valves, and particularly relates to a flat gate valve with reduced torque. Background Art

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

[0003] Lubricating the switching components can reduce the opening and closing torque of the flat gate valve to a certain extent, but currently, manual addition of lubricant is required, 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 to achieve:

[0005] A flat gate valve with reduced torque includes a valve body, a threaded rod, a valve cover, a support, and a turning handle. 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 turning handle is rotatably connected to the top wall of the support, a threaded hole is provided on the turning handle, the threaded rod is rotatably connected to the valve body, the upper end of the threaded rod extends above the turning handle, and the threaded rod is threadedly connected to the inner wall of the threaded hole;

[0006] A transmission cavity, a lubricant storage cavity, and two transmission grooves are provided on the turning handle. A pressing member is slidably connected to the inner wall of the transmission groove, the pressing member extends outside the turning handle, the pressing member is connected to the inner wall of the transmission groove through a second elastic member, an L-shaped piece is fixedly connected to the inner wall of the transmission groove, a first airbag is fixedly connected to the L-shaped piece, 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 mutually connected second airbags are provided in the transmission cavity, the two second airbags are respectively connected to the two first airbags through air pipes, the upper second airbag is fixedly connected to the bottom wall of the lifting piece, the lower second airbag is fixedly connected to the bottom wall of the transmission cavity, two or more limiting grooves are provided on the top wall of the support, the limiting rod extends into one of the limiting grooves, the lubricant storage cavity is communicated with the inner wall of the threaded hole through a lubricant passage, the lubricant storage cavity is filled with lubricant, the top wall of the baffle extends into the lubricant storage cavity, a perforation is provided on the baffle, and the baffle is slidably connected to the inner wall of the lubricant storage cavity.

[0007] Preferably, a valve cavity is provided on the valve body, the valve cavity is communicated with the outer wall of the valve body through a water inlet passage, the valve cavity is communicated with the outer wall of the valve body through a water outlet passage, a seat body is fixedly connected to the inner wall of the valve cavity, a seat passage is provided on the seat body, a valve plate is slidably connected to the inner wall of the seat passage, 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 is fixedly connected to the valve cover.

[0009] Preferably, a fixing cylinder is embedded in the valve plate. A cylinder cavity is formed in the fixing 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. The lower end of the piston rod is fixedly connected to the bottom wall of the seat passage.

[0010] A display cavity and an alarm cavity are formed in the display. The side wall of the display cavity is communicated with the top wall of the cylinder cavity through a liquid pipe. A glass plate is embedded between the top wall of the display cavity and the top wall of the display. The display cavity is filled with a display liquid. An active display block is slidably connected to the inner wall of the display cavity. A first permanent magnet is embedded in the bottom wall of the active display block. The bottom wall of the display liquid is communicated with the top wall of the alarm cavity through a connecting passage. A separator is fixedly connected to the inner wall of the connecting passage. A second permanent magnet is slidably connected to the inner wall of the connecting passage. A limiting piece, a damping block, a fifth permanent magnet and a sounding bell are fixedly connected to the inner wall of the alarm cavity. A slider is slidably connected to the inner wall of the alarm cavity. The slider abuts against the damping block. A third permanent magnet is fixedly connected to the top wall of the slider. A fourth permanent magnet is slidably connected to the bottom wall of the slider. The fourth permanent magnet is connected to a protrusion through a first elastic member. The protrusion is fixedly connected to the bottom wall of the slider. A suspension rope is fixedly connected to the bottom wall of the fourth permanent magnet. A collision member is fixedly connected to the lower end of the suspension rope.

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

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

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

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

[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 an epoxy zinc-rich primer, an epoxy mica iron intermediate paint and an epoxy topcoat.

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

[0018] Through the transmission arrangement between the limiting rod and the two pressing members, the present invention can prevent others from accidentally touching the rotating handle and causing the rotating handle to rotate, wasting the medium. It can also automatically add lubricant to the threaded rod and the rotating handle before the user rotates the rotating handle to reduce the torque required to rotate the rotating handle. It can also automatically release the limit of the limiting groove on the limiting rod to facilitate the user to rotate the rotating handle. Description of the Drawings

[0019] The present invention will be further described with reference to the accompanying drawings. However, the embodiments shown in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the following drawings.

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

[0021] Figure 2 is the present invention Figure 1 a schematic structural view of the valve body and the valve cover in;

[0022] Figure 3 is the present invention Figure 1 an enlarged view of part A in;

[0023] Figure 4 is the present invention Figure 1 an enlarged view of part B in;

[0024] Figure 5 is the present invention Figure 1 an enlarged view of part C in;

[0025] Figure 6 is the present invention Figure 1 an enlarged view of part D in;

[0026] Figure 7 is the present invention Figure 3 an enlarged view of part E in.

[0027] Reference 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; 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, partition; 27, second permanent magnet; 28, limiting piece; 29, third permanent magnet; 30, damping block; 31, slider; 311, protrusion; 32, fourth permanent magnet; 33, first elastic member; 34, collision member; 35, suspension rope; 36, fifth permanent magnet; 37, sounding bell; 38, transmission groove; 39, pressing member; 40, second elastic member; 41, L-shaped piece; 42, first airbag; 43, transmission cavity; 44, air delivery pipe; 45, second airbag; 46, limiting rod; 47, lifting piece; 48, baffle; 49, through hole; 50, limiting groove; 51, storage cavity; 52, agent passing channel; 53, lubricant. Detailed embodiments

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 a limitation to 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 should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection or a connection through an intermediate medium; it can be the communication inside two elements. 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.

[0031] As Figures 1-7 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 turning handle 11. 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 turning handle 11 is rotatably connected to the top wall of the support 10, a threaded hole 12 is provided on the turning 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 turning handle 11, and the threaded rod 8 is threadedly connected to the inner wall of the threaded hole 12;

[0032] A transmission cavity 43, a storage agent cavity 51 and two transmission grooves 38 are formed in the rotating handle 11. A pressing member 39 is slidably connected to the inner wall of the transmission groove 38. The pressing member 39 extends outside 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. An L-shaped piece 41 is fixedly connected to the inner wall of the transmission groove 38. A first airbag 42 is fixedly connected to the L-shaped piece 41. A limiting rod 46 is slidably connected to the inner wall of the transmission cavity 43. A lifting piece 47 and a baffle 48 are fixedly connected to the limiting rod 46. Two mutually connected second airbags 45 are arranged in the transmission cavity 43. The two second airbags 45 are respectively connected to the two first airbags 42 through air pipes 44. The upper second airbag 45 is fixedly connected to the bottom wall of the lifting piece 47. The lower second airbag 45 is fixedly connected to the bottom wall of the transmission cavity 43. Two or more limiting grooves 50 are formed in the top wall of the support 10. The limiting rod 46 extends into one of the limiting grooves 50. The storage agent cavity 51 is communicated with the inner wall of the threaded hole 12 through a reagent passing channel 52. A lubricant 53 is filled in the storage agent cavity 51. The top wall of the baffle 48 extends into the storage agent cavity 51. A through hole 49 is formed in the baffle 48. The baffle 48 is slidably connected to the inner wall of the storage agent cavity 51.

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

[0034] In an optional embodiment of the present invention, a valve cavity 4 is formed in the valve body 1. The valve cavity 4 is communicated with the outer wall of the valve body 1 through a water inlet channel 2. The valve cavity 4 is communicated with the outer wall of the valve body 1 through a water outlet channel 3. A seat body 5 is fixedly connected to the inner wall of the valve cavity 4. A seat channel 6 is formed in the seat body 5. A 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. 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. The valve plate 7 is used for the opening and closing of the flat gate valve.

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

[0036] In an optional embodiment of the present invention, a fixed cylinder 14 is inlaid on the valve plate 7. A cylinder cavity 15 is formed in the fixed cylinder 14. A piston body 16 is slidably connected to the inner wall of the cylinder cavity 15. The bottom wall of the piston body 16 is fixedly connected to a piston rod 17. 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 cavity 19 and an alarm cavity 25. The side wall of the display cavity 19 is communicated with the top wall of the cylinder cavity 15 through a liquid pipe 18. A glass plate 21 is inlaid between the top wall of the display cavity 19 and the top wall of the display device 13. The display cavity 19 is filled with a display liquid 20. The inner wall of the display cavity 19 is slidably connected with a movable display block 22. A first permanent magnet 23 is inlaid on the bottom wall of the movable display block 22. The bottom wall of the display liquid 20 is communicated with the top wall of the alarm cavity 25 through a connecting channel 24. A partition 26 is fixedly connected to the inner wall of the connecting channel 24. A second permanent magnet 27 is slidably connected to the inner wall of the connecting channel 24. A limiting piece 28, a damping block 30, a fifth permanent magnet 36 and a sounding bell 37 are fixedly connected to the inner wall of the alarm cavity 25. A slider 31 is slidably connected to the inner wall of the alarm cavity 25. The slider 31 abuts against the damping block 30. A third permanent magnet 29 is fixedly connected to the top wall of the slider 31. A fourth permanent magnet 32 is slidably connected to the bottom wall of the slider 31. The fourth permanent magnet 32 is connected to a protrusion 311 through a first elastic member 33. The protrusion 311 is fixedly connected to the bottom wall of the slider 31. A suspension cord 35 is fixedly connected to the bottom wall of the fourth permanent magnet 32. The lower end of the suspension cord 35 is fixedly connected to a collision member 34.

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

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

[0040] In an optional embodiment of the present invention, the partition 26 is made of a non-magnetic shielding material to facilitate the magnetic force transmission of the first permanent magnet 23 to the second permanent magnet 27.

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

[0042] In an optional embodiment of the present invention, the color of the display liquid 20 is a non-transparent color to facilitate the user to observe the quantity of the display liquid 20.

[0043] In an optional embodiment of the present invention, the material of the valve body 1 includes one of carbon steel, stainless steel or duplex steel. Carbon steel is suitable for general media such as water, oil products, steam, etc. Stainless steel has an anti-corrosion function. Duplex steel has better corrosion resistance and strength than stainless steel and is suitable for more demanding chemical medium environments.

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

[0045] The epoxy zinc-rich primer is a two-component coating refined from 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 mica iron intermediate paint contains substances arranged in a flaky manner, which reduces the water vapor permeability of the coating and prevents corrosive media from entering the outer wall of the valve body 1, playing a waterproof role.

[0047] The epoxy topcoat has outstanding water resistance, corrosion resistance and physical properties, and can play a waterproof and anti-corrosion role all year round. Nano-sized silicon carbide particles can be added to the epoxy topcoat to enhance wear resistance and make the coating more dense, improving strength and toughness.

[0048] Implementation process:

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

[0050] When the flat gate valve needs to be used, when holding the rotation handle 11 with both hands, at the same time hold the two pressing members 39. The pressing members 39 overcome the elastic force of the second elastic member 40 and move towards the L-shaped piece 41, squeezing the first airbag 42. After the pressing member 39 moves to abut against the L-shaped piece 41 and stops running, after the first airbag 42 is squeezed, the air in the first airbag 42 enters the second airbag 45 through the air delivery pipe 44. The two second airbags 45 expand, thereby pushing the lifting piece 47 to move upward, causing the limit rod 46 and the baffle 48 to move upward. The limit rod 46 is disengaged from the limit of the limit slot 50, and the through hole 49 is communicated with the agent passage 52. Thus, a part of the lubricant 53 in the agent storage cavity 51 flows through the through hole 49 and the agent passage 52 to the threaded rod 8 and the rotation 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 rotation handle 11 and the support 10, thereby reducing the torque required to rotate the rotation handle 11 and enabling the user to rotate the rotation handle 11 more labor-saving.

[0051] It is necessary to press the two pressing members 39 to make the through hole 49 and the agent passage 52 communicate. Only pressing one pressing member 39, that is, only one second airbag 45 expands, and the upward movement degree of the baffle 48 and the through hole 49 is not enough, and the agent passage 52 cannot communicate with the through hole 49, which can prevent the rotation handle 11 from rotating when others accidentally touch one pressing member 39, greatly reducing the possibility of the rotation handle 11 rotating due to accidental touch.

[0052] When the rotating handle 11 is rotated, since the threaded rod 8 is threadedly connected to the inner wall of the threaded hole 12, the rotating handle 11 will drive the threaded rod 8 to move upward. The threaded rod 8 drives the valve plate 7 to move upward, so that the medium can flow in from 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. The piston body 16 will draw 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 leftward as the display liquid 20 decreases. The user can judge the upward movement degree of the valve plate 7 according to the quantity 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, just reverse the rotating handle 11. When the valve plate 7 moves downward, the piston body 16 will move upward relative to the valve plate 7, so as to push the display liquid 20 back into the display cavity 19. The user can judge whether the valve plate 7 is completely closed by observing whether the movable display block 22 moves rightward and resets to the original position. Even if the user forgets to observe the position of the movable display block 22 and the movable display block 22 is a short distance away from being completely reset, 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. The first permanent magnet 23 magnetically adsorbs the second permanent magnet 27. The second permanent magnet 27 moves upward until it abuts against the spacer 26. After the second permanent magnet 27 moves upward, the third permanent magnet 29 loses the magnetic adsorption of the second permanent magnet 27. The third permanent magnet 29 and the slider 31 slowly move downward under the action of their own gravity and the damping force of the damper 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 adsorbed by the fifth permanent magnet 36 and moves rightward against the elastic force of the first elastic member 33. The suspension rope 35 and the collision member 34 move rightward. After the fourth permanent magnet 32 moves below the fifth permanent magnet 36, the fourth permanent magnet 32 loses the magnetic suction of the fifth permanent magnet 36. The fourth permanent magnet 32 quickly moves leftward and resets under the action of the elastic force of the first elastic member 33. The collision member 34 will swing leftward and strike the sounding bell 37 to emit an alarm bell sound, thus reminding the user that the valve plate 7 is not completely closed. After the collision member 34 rebounds from the sounding bell 37, it will strike the sounding bell 37 multiple times, making the sounding bell 37 continuously emit a bell sound.

[0055] The function of the damper block 30 is to reduce the downward movement speed of the slider 31, prevent the sounding bell 37 from giving a false alarm when the slider 31 moves downward too fast when the first permanent magnet 23 normally passes above the connecting channel 24. The sounding bell 37 will only emit a bell 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 members 39, the two pressing members 39 will move back and reset under the elastic force of the second elastic member 40. The two second air bags 45 will shrink, and the baffle 48 will block the dosing channel 52 again to prevent waste of the lubricant 53. The limiting rod 46 is inserted into one of the limiting grooves 50 to limit the rotation handle 11 to prevent accidental touch by others.

[0057] Through the transmission setting between the limiting rod 46 and the two pressing members 39, the present invention can prevent the rotation handle 11 from being accidentally touched by others, resulting in the rotation of the rotation handle 11 and waste of the medium. It can also automatically add the lubricant 53 to the threaded rod 8 and the rotation handle 11 before the user rotates the rotation handle 11 to reduce the torque required to rotate the rotation handle 11. It can also automatically release the limit of the limiting groove 50 on the limiting rod 46 to facilitate the user to rotate the rotation 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 situation of the liquid 20 and the movable display block 22 shown on the display 13. And during the operation of closing the valve plate 7, when the valve plate 7 is not completely closed, the sounding bell 37 can be automatically made to emit a continuous ringing for alarm.

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

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

Claims

1. A flat gate valve for reducing torque, characterized in that It includes a valve body (1), a threaded rod (8), a valve cover (9), a support (10) and a turning handle (11). 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 turning handle (11) is rotatably connected to the top wall of the support (10). A threaded hole (12) is formed in the turning 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 turning handle (11), and the threaded rod (8) is threadedly connected to the inner wall of the threaded hole (12). A transmission cavity (43), a storage cavity (51) and two transmission grooves (38) are formed in the turning handle (11). A pressing member (39) is slidably connected to the inner wall of the transmission groove (38). The pressing member (39) extends outside the turning handle (11). The pressing member (39) is connected to the inner wall of the transmission groove (38) through a second elastic member (40). An L-shaped piece (41) is fixedly connected to the inner wall of the transmission groove (38), and a first airbag (42) is fixedly connected to the L-shaped piece (41). A limiting rod (46) is slidably connected to the inner wall of the transmission cavity (43). A lifting piece (47) and a baffle (48) are fixedly connected to the limiting rod (46). Two mutually connected second airbags (45) are arranged in the transmission cavity (43). The two second airbags (45) are respectively connected to the two first airbags (42) through air pipes (44). The upper second airbag (45) is fixedly connected to the bottom wall of the lifting piece (47), and the lower second airbag (45) is fixedly connected to the bottom wall of the transmission cavity (43). Two or more limiting grooves (50) are formed in the top wall of the support (10). The limiting rod (46) extends into one of the limiting grooves (50). The storage cavity (51) communicates with the inner wall of the threaded hole (12) through a chemical agent passage (52). A lubricant (53) is filled in the storage cavity (51). The top wall of the baffle (48) extends into the storage cavity (51). A through hole (49) is formed in the baffle (48). The baffle (48) is slidably connected to the inner wall of the storage cavity (51).

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

3. The flat gate valve for reducing torque according to claim 2, wherein A display (13) is fixedly connected to the valve cover (9).

4. A parallel slide gate valve for reducing torque according to claim 3, characterized in that, A fixed cylinder (14) is embedded in the valve plate (7). A cylinder cavity (15) is formed in 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). The lower end of the piston rod (17) is fixedly connected to the bottom wall of the seat passage (6). A display chamber (19) and an alarm chamber (25) are formed on the display device (13). The side wall of the display chamber (19) is communicated with the top wall of the cylinder chamber (15) through a liquid pipe (18). A glass plate (21) is embedded 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). An active display block (22) is slidably connected to the inner wall of the display chamber (19). A first permanent magnet (23) is embedded in the bottom wall of the active display block (22). The bottom wall of the display liquid (20) is communicated with the top wall of the alarm chamber (25) through a connection channel (24). A partition (26) is fixedly connected to the inner wall of the connection channel (24). A second permanent magnet (27) is slidably connected to the inner wall of the connection channel (24). A limiting piece (28), a damping block (30), a fifth permanent magnet (36) and a sounding bell (37) are fixedly connected to the inner wall of the alarm chamber (25). A slider (31) is slidably connected to the inner wall of the alarm chamber (25). The slider (31) abuts against the damping block (30). A third permanent magnet (29) is fixedly connected to the top wall of the slider (31). A fourth permanent magnet (32) is slidably connected to the bottom wall of the slider (31). The fourth permanent magnet (32) is connected to a protrusion (311) through a first elastic member (33). The protrusion (311) is fixedly connected to the bottom wall of the slider (31). A suspension rope (35) is fixedly connected to the bottom wall of the fourth permanent magnet (32). A collision member (34) is fixedly connected to the lower end of the suspension rope (35).

5. The flat gate valve for reducing torque according to claim 4, characterized in that, The alarm chamber (25) is communicated 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 partition (26) is made of a non-magnetic shielding material.

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

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

9. A flat gate valve for reducing torque according to any one of claims 1-8, 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, and the anti-corrosion coating includes an epoxy zinc-rich primer, an epoxy mica iron intermediate paint and an epoxy topcoat.

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