An ultra-high pressure large-diameter manual concealed stem flat valve

Abstract

The present invention relates to the field of valve technology, and discloses an ultra-high pressure large-diameter manual concealed stem flat plate valve, comprising a valve body, a valve cover is sealed and fixedly connected to the top of the valve body, valve seats are installed on both sides of the interior of the valve body, a tail cover is sealed and fixedly connected to the bottom of the valve body, a lower guide rod is installed inside the tail cover, and a gate is threadedly connected to the outer wall of the lower guide rod. The ultra-high pressure large-diameter manual concealed stem flat plate valve can realize flow recoil on the inside of the valve body by setting a pressure relief recoil component, realize recoil cleaning and impurity removal of the filter screen, and avoid blockage of the valve as a whole. At the same time, the whole process is to realize automatic recoil, and there is no need for manual control by the operator. When the filter screen is blocked to a certain extent, according to the pressure and flow inside it, the flow channel will be automatically converted to release pressure and recoil, thereby improving the overall service life of the flat plate valve, and directly reducing the probability of valve blockage, which is more convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to an ultra-high pressure large-diameter manual concealed-stem flat valve. Background Art

[0002] The flat gate valve is a commonly used valve. The flat gate valve usually includes a valve body, a gate plate, and a valve stem. The gate plate is arranged on the inner cavity flow channel of the valve body, and the valve stem is penetrated through the valve body. The lower end of the valve stem is fixedly connected to the gate plate in the valve body, and the upper end of the valve stem is connected to an actuator such as a handwheel. The user turns the handwheel and other actuators to make the valve stem rise and fall linearly, thereby driving the gate plate fixed to the valve stem to rise and fall linearly, so that the flow channel through hole on the gate plate connected to the inner cavity flow channel of the valve body is opened or closed, thereby realizing the opening and closing of the valve.

[0003] During the use of the current flat gate valve, many impurities will first enter the interior of the valve along with the liquid. The traditional method is to use a filter to perform preliminary filtration on the liquid inlet end to ensure that larger impurities will not easily enter the interior of the valve and cause blockage. However, some small impurities will still enter the interior of the valve. A major defect is that the operator is required to clean the filter from time to time. At the same time, if impurities are attached to the various joints inside the valve, the opening and closing of the valve will be blocked, and even with long-term use, the valve will be blocked, the pressure will increase, and the valve will be damaged. Therefore, an ultra-high pressure large-diameter manual concealed stem flat gate valve is proposed to solve the above-mentioned problems. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides an ultra-high pressure, large-diameter, manual, concealed-stem, flat-plate valve, which solves the problem that the flat-plate valve in the prior art is overloaded, and impurities in the liquid will pass through the interior of the valve with the flow of the liquid and may adhere to the inside of the valve, causing a certain blockage in the opening and closing of the valve, and at the same time causing the valve pressure to increase, resulting in a valve explosion.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an ultra-high pressure large-diameter manual concealed stem flat valve, comprising a valve body, a valve cover is sealed and fixedly connected to the top of the valve body, valve seats are installed on both sides of the interior of the valve body, a tail cover is sealed and fixedly connected to the bottom of the valve body, a lower guide rod is installed inside the tail cover, a gate plate is threadedly connected to the outer wall of the lower guide rod, the top of the gate plate is connected to the valve stem through a T-slot, the upper part of the valve stem is fixedly connected to a ball screw through a cylindrical pin, a rotating nut is fixedly connected to the outer wall of the ball screw, the upper and lower sides of the outer step of the rotating nut are rotatably connected to the valve cap through thrust roller bearings, the lower inner wall of the valve cap is fixedly connected to the top of the valve cap, the top of the valve cap is clearance-matched with the outer wall of the rotating nut, the outer wall of the valve cap is fixedly connected to a handwheel through a handwheel pin, and a pressure relief recoil component is arranged inside the valve body.

[0008] Preferably, sealing packing is filled between the outer wall of the lower guide rod and the inner wall of the tail cover, and between the outer wall of the valve stem and the inner wall of the valve cover. The outer ends of the sealing packings on the upper and lower sides are pressed against packing glands. The packing gland located above is fixedly connected to the tail cover, and the packing gland located below is fixedly connected to the valve cover.

[0009] Preferably, the pressure relief recoil assembly comprises a pressure relief device and a recoil device;

[0010] The pressure relief device includes a pressure shaft, one end of which is connected to a pressure plate, the pressure plate is slidably connected to the inside of the valve body, a compression spring is sleeved on the surface of the pressure shaft, and a pressure relief port is opened inside the valve body.

[0011] Preferably, the valve body is internally rotatably connected to a connecting shaft, a blocking plate is connected to the connecting shaft, a key is abutted on the left side of the blocking plate, a torsion spring is sleeved on the connecting shaft, one end of the torsion spring is connected to the connecting shaft, and the other end of the torsion spring is connected to the valve body.

[0012] Preferably, the backflushing device includes a filter component and a backflow pipe, one end of the backflow pipe is connected to the valve body, the other end of the backflow pipe passes through the valve body and is connected to the valve seat, the interior of the backflow pipe is connected to a fixed rod, a baffle is slidably connected to the fixed rod, one side of the baffle is connected to a tension spring, one end of the tension spring is connected to the backflow pipe, and the filter component is arranged inside the valve body.

[0013] Preferably, the filter screen component includes filter plate one and filter plate two, both filter plate one and filter plate two are connected with tooth plates, and a pinion is meshed between the two tooth plates, the internal rotation of the valve body is connected with an impeller, the blades of the impeller are abutted with a lever, and the lever is connected to filter plate one.

[0014] Preferably, a slot is provided inside the valve body, the valve seat is arranged inside the slot, the pinion is rotatably connected inside the valve body, and the filter plate 1 and the filter plate 2 are both slidably connected up and down inside a movable slot provided inside the valve body.

[0015] Preferably, a center hole gasket is provided at the connection between the tail cover and the valve body, a bearing is provided between the rotating nut and the valve cap, and the bearing is mounted on the rotating nut.

[0016] Preferably, an alarm is connected to one end of the pressure relief port, a pressure sleeve is connected to the lower guide rod, the pressure sleeve is conical, and a pipe is connected to one end of the pressure relief port, one end of the pipe is connected to the right end of the valve body.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides an ultra-high pressure large-diameter manual concealed stem flat valve, which has the following beneficial effects:

[0019] 1. This ultra-high pressure large-diameter manual concealed stem flat valve can realize flow recoil on the inside of the valve body by setting a pressure relief recoil component, realize recoil cleaning and impurity removal of the filter, and avoid blockage of the valve as a whole. At the same time, the whole process is automatic recoil, and there is no need for manual control by the operator. When the filter is blocked to a certain extent, the flow channel will be automatically converted for pressure relief and recoil according to the internal pressure and flow, thereby improving the overall service life of the flat valve, and directly reducing the probability of valve blockage, making it more convenient to use.

[0020] 2. The ultra-high pressure large-diameter manual concealed stem flat valve is connected through the matching of the valve body, valve cover, valve stem, ball screw, rotating nut and hand wheel. The hand wheel can be used to quickly rotate the rotating nut and the ball screw clockwise or counterclockwise to make the valve stem drive the gate plate to move up and down, close the valve, and realize precise control of the fluid flow. By adjusting the different positions of the gate plate and the staggered position of the valve seat, the size of the total flow area can be adjusted, thereby realizing the adjustment of the flow rate, which is more practical.

[0021] 3. The ultra-high pressure large-diameter manual concealed stem flat plate valve, through the cooperation of sealing packing, packing gland, inner and outer sealing rings of the valve seat and the center hole sealing gasket ring, makes the sealing between the valve body and the valve cover and the bottom cover, the valve body and the valve seat, the lower guide rod and the bottom cover, and the valve cover and the valve cover better when the valve is in use, thereby improving the overall sealing performance, avoiding leakage, improving and ensuring its use effect, and facilitating people's use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of an ultra-high pressure large-diameter manual concealed-stem flat valve proposed by the present invention;

[0023] Figure 2 This is a schematic diagram of the overall cross-sectional structure of an ultra-high pressure large-diameter manual concealed-stem flat plate valve proposed by the present invention;

[0024] Figure 3 A plan cross-sectional view of an ultra-high pressure large-diameter manual concealed-stem flat valve proposed by the present invention;

[0025] Figure 4 This is a schematic structural diagram of a pressure relief device of an ultra-high pressure large-diameter manual concealed-stem flat valve proposed by the present invention;

[0026] Figure 5 This is a schematic diagram of the backflow pipe structure of an ultra-high pressure large-diameter manual concealed-stem flat valve proposed by the present invention;

[0027] Figure 6 This is a schematic structural diagram of a filter device for an ultra-high pressure, large-diameter, manual concealed-stem flat valve proposed by the present invention;

[0028] Figure 7 This is a schematic diagram of the baffle plate structure of an ultra-high pressure large-diameter manual concealed-stem flat valve proposed by the present invention.

[0029] In the figure: 1. valve body; 2. valve seat; 3. valve cover; 4. valve stem; 5. ball screw; 6. hand wheel; 7. gate; 8. center hole gasket; 9. tail cover; 10. lower guide rod; 11. pressure relief recoil assembly; 12. bearing; 13. pressure plate; 14. pressure shaft; 15. extrusion spring; 16. movable groove; 17. slot; 18. impeller; 19. filter plate one; 20. filter plate two; 21. tooth plate; 22. pinion; 23. lever; 24. barrier plate; 25. connecting shaft; 26. key; 27. baffle; 28. tension spring; 29. ​​fixing rod; 30. pressure relief port; 31. reflux pipe; 32. pressure sleeve. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1-Figure 7A super-high-pressure large-diameter manual concealed-stem flat valve comprises a valve body 1, a valve cover 3 is sealed and fixedly connected to the top of the valve body 1, valve seats 2 are installed on both sides of the interior of the valve body 1, a tail cover 9 is sealed and fixedly connected to the bottom of the valve body 1, a lower guide rod 10 is installed inside the tail cover 9, a gate plate 7 is threadedly connected to the outer wall of the lower guide rod 10, a valve stem 4 is connected to the top of the gate plate 7 through a T-slot, a ball screw 5 is fixedly connected to the upper part of the valve stem 4 through a cylindrical pin, a rotating nut is fixedly connected to the outer wall of the ball screw 5, a valve cap is rotatably connected to the outer step of the rotating nut through a thrust roller bearing on both the upper and lower sides, the lower inner wall of the valve cap is fixedly connected to the top of the valve cover 3, the top of the valve cap is clearance-matched with the outer wall of the rotating nut, a hand wheel 6 is fixedly connected to the outer wall of the valve cap through a hand wheel pin, and a pressure relief recoil component 11 is arranged inside the valve body 1.

[0032] In this embodiment, please refer to Figure 3 , the outer wall of the lower guide rod 10 and the inner wall of the tail cover 9, the outer wall of the valve stem 4 and the inner wall of the valve cover 3 are filled with sealing packing, the outer ends of the sealing packings on the upper and lower sides are tightly pressed against packing glands, the packing gland located at the top is fixedly connected to the tail cover 9, and the packing gland located at the bottom is fixedly connected to the valve cover 3. At the same time, through the cooperation of the sealing packing, the packing gland, the inner and outer sealing rings of the valve seat 2 and the center hole sealing gasket ring, when the valve is in use, the sealing performance between the valve body 1 and the valve cover 3 and the bottom cover, the valve body 1 and the valve seat 2, the lower guide rod 10 and the bottom cover, and the valve cover 3 and the valve cover 3 is better, thereby improving the overall sealing performance, avoiding leakage, improving and ensuring its use effect, and facilitating people to use.

[0033] Furthermore, the pressure relief recoil assembly 11 includes a pressure relief device and a recoil device;

[0034] See also Figure 4The pressure relief device includes a pressure shaft 14, one end of which is connected to a pressure plate 13, which is slidably connected to the inside of the valve body 1, and a compression spring 15 is sleeved on the surface of the pressure shaft 14, and a pressure relief port 30 is opened inside the valve body 1. A connecting shaft 25 is rotatably connected inside the valve body 1, and a blocking plate 24 is connected to the connecting shaft 25. A key 26 is abutted on the left side of the blocking plate 24, and a torsion spring is sleeved on the connecting shaft 25, one end of the torsion spring is connected to the connecting shaft 25, and the other end of the torsion spring is connected to the valve body 1. There is no flow force in the main channel, so the torsion spring will slowly recover at this time, and then drive the baffle plate 24 to rotate, so that it is converted into a vertical state, and its position is restricted by the blocking of the key 26. Therefore, the backflow pressure at this time will be greater than the pressure of the main channel, and backflow flushing will be performed. After that, the impurity and sewage liquid will be discharged from the pressure relief port 30 opened inside the valve body 1. In order to prevent the liquid from being discharged from the pressure relief port 30 when the valve is in normal use, a pressing plate 13 and a pressing shaft 14 are provided. Under normal conditions, due to the reversal of the baffle plate 24 and the push of the extrusion spring 15, the pressing plate 13 will be controlled to block the position of the pressure relief port 30, so as to prevent the liquid from being discharged from the position of the pressure relief port 30 when the valve is in normal use.

[0035] For further information, see Figure 5 The backwash device includes a filter component and a backflow pipe 31. One end of the backflow pipe 31 is connected to the valve body 1, and the other end of the backflow pipe 31 passes through the valve body 1 and is connected to the valve seat 2. A fixed rod 29 is connected to the inside of the backflow pipe 31, and a baffle 27 is slidably connected to the fixed rod 29. A tension spring 28 is connected to one side of the baffle 27, and one end of the tension spring 28 is connected to the backflow pipe 31. The filter component is arranged inside the valve body 1. When the filter component is blocked, the fluid will gradually flow out from the positions of the two backflow pipes 31, because the main channel of the fluid is blocked at this time, and it can only flow in from the branch channel. After the liquid flows into the backflow pipe 31, it will squeeze and push the baffle 27 to slide out of the backflow pipe 31. Then, the liquid will enter the inside of the valve seat 2 from the notch position, and then backwash the filter plate 19, and backwash the impurities on the two filter plates.

[0036] Also, see Figure 6The filter screen component includes a filter plate 19 and a filter plate 20, and the filter plates 19 and 20 are both connected with tooth plates 21, and a pinion 22 is meshed between the two tooth plates 21. The valve body 1 is internally connected with an impeller 18, and a lever 23 is abutted on the blades of the impeller 18, and the lever 23 is connected to the filter plate 19. The impeller 18 is rotated, and the rotation process continuously moves the lever 23 upward, thereby driving the filter plate 19 to move upward. At this time, the upward movement of the filter plate 19 will drive the tooth plate 21 to move upward. After the two-way meshing of the pinion 22 in the middle, the two filter plates will present an up-and-down state at this time, realizing staggered motion. The purpose of staggered motion is to squeeze and rub the impurities on the filter plates, or squeeze and cut them, and use the squeezing method to separate some impurities from the filter screen to achieve self-cleaning. Therefore, each time the impeller 18 rotates, the two filter plates will be moved to slide up and down alternately.

[0037] In addition, see Figure 4 The valve body 1 has a slot 17 inside, the valve seat 2 is arranged inside the slot 17, the pinion 22 is rotatably connected inside the valve body 1, and the filter plate 1 19 and the filter plate 2 20 are both slidably connected inside the movable slot 16 opened inside the valve body 1. The slot 17 is arranged to facilitate the positioning of the valve seat 2, so that it will not easily move, shake, or shift, and firmly fix it, so that the gate can be opened and closed more smoothly in the later stage. The movable slot 16 is to provide sliding space for the two filter plates.

[0038] It is worth noting that see Figure 2-Figure 3 , a center hole gasket 8 is provided at the connection between the tail cover 9 and the valve body 1, a bearing 12 is provided between the rotating nut and the valve cap, and the bearing 12 is installed on the rotating nut. An alarm is connected to one end of the pressure relief port 30, and the alarm can prompt or warn the staff that the current valve is in the sewage backwash stage. A pressure sleeve 32 is connected to the lower guide rod 10, and the pressure sleeve 32 is conical, and one end of the pressure relief port 30 is connected to a pipeline. The purpose of adding a branch pipe here is to drain the impurities and drain them to other locations for collection and treatment. The purpose of the pressure sleeve 32 is to limit the sliding distance of the pressure shaft 14. When the valve is closed, the pressure sleeve 32 will move down and abut against the pressure shaft 14, limiting the valve in the closed state, and will be discharged from the position of the pressure relief port 30, so as long as the valve is closed, the whole will form a closed state, and the main channel and the tributary channel will be directly closed.

[0039] Working principle: the operator drives the rotating nut to rotate by turning the hand wheel 6, and the rotating nut is rotatably connected to the valve cap through the bearing 12. Therefore, the principle of threaded connection is used to drive the ball screw 5 to move up and down, and the gate plate 7 is driven to rise and fall through the connection of the valve stem 4. When the hole position of the gate plate 7 corresponds to the hole position of the valve body 1, the whole valve will open, and the liquid will be drained from the flow channel. When it moves up to a certain distance, the sealing part of the gate plate 7 will block the internal flow channel of the valve body 1. When the liquid is circulating, the flow force will impact the baffle plate 24, and the baffle plate 24 will be rotated by pressure, so that the torsion spring will contract. After the baffle plate 24 rotates, the liquid will act on the filter plate 19 and the filter plate 20. The two filter plates will filter the liquid and make the fluid pass through the gate plate 7 and be discharged from the outlet position of the valve body 1. When the liquid flows, it will directly act on the impeller 18 to make it rotate. The rotation process can not only play a certain rotation speed-increasing effect, but also can continuously fluctuate the rise of the lever 23 during the rotation process, thereby driving the filter plate 19 to move upward. At this time The upward movement of filter plate 19 will drive the tooth plate 21 to move upward, and through the two-way meshing of the small gear 22 in the middle, the two filter plates will be in an up and down state at this time, realizing staggered motion. The purpose of the staggered motion is to squeeze and rub the impurities on the filter plates, or to squeeze and cut them, so that some impurities can be separated from the filter screen by squeezing and rubbing, thereby realizing self-cleaning. Therefore, each time the impeller 18 rotates, the two filter plates will be moved to slide up and down alternately, and then slide down with gravity. The weight of filter plate 19 must be greater than the weight of filter plate 20, because the lever 23 is connected to filter plate 19, and it will automatically fall down due to the large gravity and contact with the impeller 18.With the long-term use of the valve and the long-term flushing of the flow channel, it is inevitable that a certain degree of impurities will be attached or blocked on the filter plate. When blocked, the fluid will gradually flow out from the two reflux pipes 31. Because the main channel of the fluid is blocked at this time, it can only flow in from the branch channel. After the liquid flows in from the inside of the reflux pipe 31, it will squeeze and push the baffle 27 to slide out of the reflux pipe 31. Then the liquid will enter the inside of the valve seat 2 from the notch, and then backwash the filter plate 19 to backwash the impurities on the two filter plates. After that, because there is no flow force in the main channel, the torsion spring will slowly recover, and the fluid will flow out. The blocking plate 24 is driven to rotate and converted into a vertical state. The position is restricted by the blocking of the key 26. Therefore, the backflow pressure at this time will be greater than the pressure of the main channel, and backflow flushing is performed. After that, the impurity sewage liquid will be discharged from the pressure relief port 30 opened inside the valve body 1. In order to prevent the liquid from being discharged from the pressure relief port 30 when the valve is in normal use, the pressing plate 13 and the pressing shaft 14 are set. Under normal conditions, at this time, due to the reversal of the blocking plate 24 and the push of the extrusion spring 15, the pressing plate 13 will be controlled to block the position of the pressure relief port 30, so as to prevent the liquid from being discharged from the position of the pressure relief port 30 when the valve is in normal use. In addition, during the backwashing process, a part of the liquid will be discharged from the lead-out end of the valve, so the valve will still operate as usual, with only a temporary reduction in flow. When the backwash is gradually completed, the internal liquid flow will gradually pass through the filter plate, so the pressure of the main channel at this time will be greater than the pressure of the backflow channel, so the baffle 24 will gradually open, and the liquid will gradually pass through the main channel, that is, the direct current channel of the valve body 1, thereby achieving normal drainage, and the remaining tributaries will be reset by the action of the spring to close the channel of the pressure relief port 30. When the gate plate 7 closes the valve as a whole, the gate plate 7 will block the channel of the valve seat 2 and the channel of the backflow pipe 31 at this time, so even if the water flow enters the backflow pipe 31 at the branch position, it cannot drive the baffle 27 to slide, because it is directly blocked by the gate plate 7, limiting the sliding of its position. The gate plate 7 is provided with a slide groove to facilitate the sliding of the gate plate 7 on the fixed rod 29.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. An ultra-high pressure large-diameter manual concealed stem flat valve, characterized in that: The valve body (1) comprises a valve cover (3) which is sealed and fixedly connected to the upper part of the valve body (1), valve seats (2) are installed on both sides of the interior of the valve body (1), a tail cover (9) is sealed and fixedly connected to the lower part of the valve body (1), a lower guide rod (10) is installed inside the tail cover (9), a gate plate (7) is threadedly connected to the outer wall of the lower guide rod (10), the top of the gate plate (7) is connected to the valve stem (4) via a T-shaped groove, the upper part of the valve stem (4) is fixedly connected to a ball screw (5) via a cylindrical pin, the outer wall of the ball screw (5) is fixedly connected to a rotating nut, the upper and lower sides of the outer step of the rotating nut are rotatably connected to the valve cap via thrust roller bearings, the lower part of the inner wall of the valve cap is fixedly connected to the top of the valve cover (3), the top of the valve cap is clearance-matched with the outer wall of the rotating nut, the outer wall of the valve cap is fixedly connected to a hand wheel (6) via a hand wheel pin, and a pressure relief recoil assembly (11) is arranged inside the valve body (1); The pressure relief recoil assembly (11) comprises a pressure relief device and a recoil device; The pressure relief device comprises a pressure shaft (14), one end of the pressure shaft (14) is connected to a pressure plate (13), the pressure plate (13) is slidably connected to the inside of the valve body (1), a compression spring (15) is sleeved on the surface of the pressure shaft (14), and a pressure relief port (30) is provided inside the valve body (1); The valve body (1) is internally rotatably connected to a connecting shaft (25), a blocking plate (24) is connected to the connecting shaft (25), a latch key (26) is abutted on the left side of the blocking plate (24), a torsion spring is sleeved on the connecting shaft (25), one end of the torsion spring is connected to the connecting shaft (25), and the other end of the torsion spring is connected to the valve body (1); The backflushing device comprises a filter component and a backflow pipe (31), one end of the backflow pipe (31) is in communication with the valve body (1), the other end of the backflow pipe (31) passes through the valve body (1) and is connected to the valve seat (2), the interior of the backflow pipe (31) is connected to a fixing rod (29), a baffle (27) is slidably connected to the fixing rod (29), a tension spring (28) is connected to one side of the baffle (27), one end of the tension spring (28) is connected to the backflow pipe (31), and the filter component is arranged inside the valve body (1); The filter screen component comprises a filter plate 1 (19) and a filter plate 2 (20), the filter plate 1 (19) and the filter plate 2 (20) are both connected to a tooth plate (21), and a pinion (22) is meshed between the two tooth plates (21), the valve body (1) is internally rotatably connected to an impeller (18), a blade of the impeller (18) is abutted against a lever (23), and the lever (23) is connected to the filter plate 1 (19); A slot (17) is provided inside the valve body (1), the valve seat (2) is arranged inside the slot (17), the pinion (22) is rotatably connected to the inside of the valve body (1), and the filter plate 1 (19) and the filter plate 2 (20) are both slidably connected up and down inside a movable slot (16) provided inside the valve body (1).

2. The ultra-high pressure large-diameter manual concealed stem flat valve according to claim 1, characterized in that: Sealing packing is filled between the outer wall of the lower guide rod (10) and the inner wall of the tail cover (9), and between the outer wall of the valve stem (4) and the inner wall of the valve cover (3). The outer ends of the sealing packings on the upper and lower sides are tightly pressed against packing glands. The packing gland located at the top is fixedly connected to the tail cover (9), and the packing gland located at the bottom is fixedly connected to the valve cover (3).

3. The ultra-high pressure large-diameter manual concealed stem flat valve according to claim 2, characterized in that: A center hole gasket (8) is provided at the connection between the tail cover (9) and the valve body (1), a bearing (12) is provided between the rotating nut and the valve cap, and the bearing (12) is mounted on the rotating nut.

4. The ultra-high pressure large-diameter manual concealed stem flat valve according to claim 1, characterized in that: One end of the pressure relief port (30) is connected to an alarm, the lower guide rod (10) is connected to a pressure sleeve (32), the pressure sleeve (32) is conical, one end of the pressure relief port (30) is connected to a pipeline, one end of the pipeline is connected to the right end of the valve body (1).

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