Water hammer buffering type protection gate valve body structure with buffer cavity

Abstract

The application relates to the technical field of gate valves, in particular to a water hammer buffering type protection gate valve body structure with a buffer cavity, which comprises a valve body mechanism, a valve cover mechanism is arranged above the valve body mechanism, a buffer mechanism and a valve plate mechanism are arranged in the valve body mechanism, and a mounting ring is arranged on one side of the valve plate mechanism; the two-stage buffer structure of primary buffer and secondary buffer is adopted, water hammer impact first drives a sealing plate to compress a spring one to complete primary energy absorption; after medium further enters the buffer cavity, a piston disc is driven to compress a buffer spring and complete secondary buffer with the air in the cavity, water hammer impact energy is gradedly dissipated, water hammer peak pressure is reduced, the valve body and upstream and downstream pipelines are protected, and the erosion damage risk caused by water hammer is reduced.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, specifically to a valve body structure for a water hammer buffer type protective gate valve with a buffer chamber. Background Technology

[0002] Gate valves are commonly used on / off control components in water supply, drainage, and industrial fluid transportation pipeline systems. They rely on the rise and fall of the valve plate to achieve the opening and closing of the pipeline. During pipeline operation, when the gate valve is quickly closed to cut off the fluid, the flowing medium in the pipeline will continue to move forward due to inertia. After the valve plate closes and blocks the flow channel, the medium velocity changes drastically, which can easily cause water hammer. Water hammer can generate extremely high instantaneous impact pressure, which impacts the gate valve plate, valve body, and upstream and downstream pipelines. In mild cases, it can erode the valve sealing surfaces and cause internal leakage; in severe cases, it can cause valve body cracking, pipeline weld damage, and medium leakage accidents.

[0003] The inventors have discovered at least the following problems in the prior art: While some existing gate valves incorporate buffer structures to resist water hammer, numerous drawbacks still exist. First, the buffer channel of most gate valves with buffers is always in a conducting state. When the valve is in a fully open or half-open regulating condition, the fluid disturbance will drive the buffer piston to reciprocate, and the buffer seal will continue to wear and tear, making the buffer assembly prone to premature failure. Secondly, most valves are only equipped with a single-stage buffer, which has limited energy dissipation capacity and is not effective in protecting against strong water hammer impacts generated by high-flow pipelines.

[0004] Therefore, this solution provides a water hammer buffer type protective gate valve body structure with a buffer chamber to solve the above problems. Summary of the Invention

[0005] In view of the problems in the prior art, such as the buffer channel being constantly open, which can easily cause the buffer component to fail prematurely, and the single-stage buffer being insufficient in protecting against strong water hammer, the present invention provides a water hammer buffer type protective gate valve body structure with a buffer chamber to solve the above problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A water hammer buffer type protective gate valve body structure with a buffer chamber includes a valve body mechanism, a valve cover mechanism on top of the valve body mechanism, a buffer mechanism and a valve plate mechanism inside the valve body mechanism, and an installation ring on one side of the valve plate mechanism; the valve body mechanism includes a valve seat and a gate channel that is vertically connected inside, and a support block is provided inside the gate channel; the valve cover mechanism includes a valve cover and a connecting ring on the inner side below the valve cover, a sealing cylinder is fixedly connected to the top of the valve cover, and a screw is slidably connected to both the valve cover and the sealing cylinder, with a valve stem fixedly connected to the bottom end of the screw; the buffer mechanism includes a piston disc and a buffer spring above it, the piston disc being slidably connected to the periphery of the valve stem; the valve plate mechanism includes a side valve plate one and a side valve plate two distributed on the left and right, and a locking component is provided on the side of the side valve plate one and the side valve plate two that are close to each other, and a primary buffer port is opened in the middle of the side valve plate two; the locking component includes a primary buffer cylinder and a linkage ring rotatably connected to its periphery.

[0007] Preferably, the valve seat has an integral inlet pipe and an outlet pipe on both sides, the inner walls of both sides of the gate are provided with grooves, the support block is fixedly connected to the inner wall of one of the grooves, the side of the support block near the second side valve plate is fixedly connected with a rack, and the linkage ring is provided with a toothed groove on one side, the rack cooperating with the toothed groove.

[0008] Preferably, the top port of the valve seat is fixedly connected with annularly distributed bolts, which penetrate the valve cover and are connected by nuts. The side valve plate two and the side valve plate one are respectively provided with sealing rings on opposite sides, and the sealing rings fit the inner wall of the gate.

[0009] Preferably, a pressure gauge is inserted into one side of the valve cover, and an air injection port is provided on the other side of the valve cover. A connecting ring is fixedly connected to the inner wall of the valve cover and fits inside the top of the buffer spring. A handwheel is rotatably connected to the top of the sealing cylinder and is threadedly connected to the outer periphery of the screw.

[0010] Preferably, sealing plates are installed on both the upper and lower sides of the piston disc, a receiving ring is fixedly connected to the middle of the upper part of the piston disc, the bottom end of the buffer spring is located on the periphery of the receiving ring, the periphery of the piston disc fits against the inner wall of the buffer cavity, and the periphery of the sealing plate is interference-fitted against the inner wall of the buffer cavity.

[0011] Preferably, the top ends of the first side valve plate and the second side valve plate are respectively provided with an integral connecting block 1 and a connecting block 2, the bottom end of the valve stem is fixedly connected between the connecting block 1 and the connecting block 2, and the sides of the first side valve plate and the second side valve plate are respectively provided with an integral slider 1 and a slider 2, both of which fit into the inside of the slide groove.

[0012] Preferably, the side valve plate has a ring of holes in the middle, and a guide rod is inserted into the hole. The initial buffer cylinder has a sealing plate that slides left and right inside it. A spring is provided on one side of the sealing plate. One end of the guide rod is fixedly connected to the sealing plate, and the spring surrounds the outer periphery of the guide rod.

[0013] Preferably, the inner wall of the initial buffer cylinder is slidably connected with annularly distributed limiting wedges, one side of the initial buffer cylinder is fixedly connected with a connecting arc plate, and both the upper and lower ends of one side of the initial buffer cylinder are provided with semi-circular notches.

[0014] Preferably, the inner wall of the linkage ring is fixedly connected with annularly distributed inclined pressure strips, and a connecting protrusion is fixedly connected to one side of the limiting wedge. The connecting protrusion cooperates with the inclined pressure strips, and a spring piece is provided at the center point of the limiting wedge away from the initial buffer cylinder.

[0015] Preferably, the mounting ring is installed on the outside of the primary buffer port, and a filter screen is fixedly connected to the middle of the mounting ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a two-stage buffering structure consisting of primary and secondary buffering. The water hammer impact first pushes the sealing plate to compress the spring, completing the primary energy absorption. After the medium further enters the buffer chamber, it pushes the piston disc to compress the buffer spring and the sealed air in the chamber, completing the secondary buffering. This process dissipates the water hammer impact energy in stages, reduces the peak water hammer pressure, protects the valve body and upstream and downstream pipelines, and lowers the risk of erosion damage caused by water hammer.

[0017] This invention utilizes a mechanical locking assembly consisting of a rack, a linkage ring, and a limiting wedge to achieve mechanical linkage through the lifting and lowering action of the valve plate during closing and opening. The locking of the sealing plate can only be released and the buffer passage opened when the valve is fully closed. The sealing plate is locked in the fully open and partially open states of the valve, closing the primary buffer port and preventing the buffer piston from undergoing ineffective reciprocating motion when the valve is not closed. This reduces wear on vulnerable parts such as the sealing plate and extends the service life of the buffer mechanism.

[0018] This invention, by configuring an installation ring with a filter screen on the outside of the primary buffer port, can intercept large solid particles in the pipeline, prevent impurities from entering the buffer chamber, prevent piston disc jamming and sealing surface scratches, and ensure the long-term reliability of the buffer mechanism. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front cross-sectional view of the entire invention; Figure 3 This is a schematic diagram of the internal structure of the valve body mechanism of the present invention; Figure 4 This is a top view of the valve body mechanism of the present invention; Figure 5 This is a schematic diagram of the valve cover mechanism and buffer mechanism of the present invention; Figure 6 This is a schematic diagram of the disassembled structure of the valve plate mechanism of the present invention; Figure 7 This is a schematic diagram showing the disassembled structure of the second side valve plate and the locking assembly of the present invention; Figure 8 This is a partial structural side view of the locking component of the present invention.

[0020] In the picture: 1. Valve body mechanism; 11. Valve seat; 12. Inlet pipe; 13. Outlet pipe; 14. Gate; 15. Slide groove; 16. Buffer chamber; 17. Support block; 18. Rack; 19. Bolt; 2. Valve cover mechanism; 21. Valve cover; 22. Sealing cylinder; 23. Connecting ring; 24. Pressure gauge; 25. Air injection port; 26. Valve stem; 27. Screw; 28. Handwheel; 3. Buffer mechanism; 31. Piston disc; 32. Sealing plate; 33. Receiving ring; 34. Buffer spring; 4. Valve plate mechanism; 41. Side valve plate one; 411. Connecting block one; 412. Slider one; 42. Insertion hole; 43. Guide rod; 44. Sealing plate; 45. Spring one; 46. Side valve plate two; 461. Connecting block two; 462. Slider two; 463. Primary buffer port; 47. Sealing ring; 48. Locking assembly; 481. Initial buffer cylinder; 482. Connecting arc plate; 483. Semi-circular notch; 484. Limiting wedge; 485. Connecting protrusion; 486. Spring piece; 487. Linkage ring; 488. Beveled pressure strip; 489. Toothed groove; 5. Installation ring; 51. Filter screen. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example: Please refer to Figures 1-8 The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber shown includes a valve body mechanism 1, a valve cover mechanism 2 is provided above the valve body mechanism 1, a buffer mechanism 3 and a valve plate mechanism 4 are provided inside the valve body mechanism 1, and an installation ring 5 is provided on one side of the valve plate mechanism 4. Valve body mechanism 1 includes valve seat 11 and a gate 14 that is vertically connected to its interior. A support block 17 is provided inside the gate 14. The valve cover mechanism 2 includes a valve cover 21 and a connecting ring 23 on the inner side below the valve cover 21. A sealing cylinder 22 is fixedly connected to the top of the valve cover 21. Screws 27 are slidably connected up and down inside both the valve cover 21 and the sealing cylinder 22. A valve stem 26 is fixedly connected to the bottom end of the screw 27. The buffer mechanism 3 includes a piston disc 31 and a buffer spring 34 above it. The piston disc 31 is slidably connected to the periphery of the valve stem 26. The valve plate mechanism 4 includes a first side valve plate 41 and a second side valve plate 46 distributed on the left and right. A locking component 48 is provided on the side where the first side valve plate 41 and the second side valve plate 46 are close to each other. A primary buffer port 463 is provided in the middle of the second side valve plate 46. Locking assembly 48 includes a primary buffer cylinder 481 and a rotating linkage ring 487 rotatably connected to its periphery; The water flow enters from the inlet pipe 12 and flows out from the outlet pipe 13. After the valve plate mechanism 4 moves down and closes, it will be intercepted inside the gate 14. At this time, due to the inertia of the water flow inside the outlet pipe 13, a negative pressure will be generated, which will then generate water hammer. As a result, the water flow will impact one side of the second side valve plate 46 in the opposite direction. The outer sides of the first side valve plate 41 and the second side valve plate 46 are both inclined surfaces.

[0023] In this embodiment, an integral inlet pipe 12 and an outlet pipe 13 are provided on both sides of the valve seat 11. Slide grooves 15 are provided on both sides of the gate 14. The support block 17 is fixedly connected to the inner wall of one of the slide grooves 15. A rack 18 is fixedly connected to the side of the support block 17 near the side valve plate 46. A toothed groove 489 is provided on one side of the linkage ring 487. The rack 18 cooperates with the toothed groove 489. Among them, the slide groove 15 is used to ensure the stability of the valve plate mechanism 4 sliding up and down; when the valve plate mechanism 4 moves down to cut off the flow, the side valve plate 1 41 and the side valve plate 2 46 will pass through the outside of the support block 17 and the rack 18, so that the rack 18 meshes with the tooth groove 489, forcing the tooth groove 489 to rotate counterclockwise.

[0024] In this embodiment, the top port of the valve seat 11 is fixedly connected with annularly distributed bolts 19, which penetrate the valve cover 21 and are connected by nuts. The side valve plate 2 46 and the side valve plate 1 41 that are far apart from each other are both provided with sealing rings 47, which fit the inner wall of the gate 14. The sealing ring 47 is used to fit against the inner wall of the gate 14 after the valve plate mechanism 4 is closed, thereby ensuring the sealing performance after closing, which is the prior art.

[0025] In this embodiment, a pressure gauge 24 is inserted into one side of the valve cover 21, and an air injection port 25 is provided on the other side of the valve cover 21. A connecting ring 23 is fixedly connected to the inner wall of the valve cover 21. The connecting ring 23 is fitted to the inner side of the top of the buffer spring 34. A handwheel 28 is rotatably connected to the top of the sealing cylinder 22. The handwheel 28 is threadedly connected to the outer periphery of the screw 27. The connecting ring 23 and the sealing plate 32 are both used to limit the position of the buffer spring 34; the pressure gauge 24 is used to monitor the air pressure in the buffer chamber 16 after being compressed by the buffer mechanism 3; when it is necessary to fill the buffer chamber 16 with air pressure, the external water pump flow can be stopped and the buffer chamber 16 can be pressurized or depressurized through the air injection port 25. Figure 5 When the valve plate mechanism 4 is in the closed state, part of the valve stem 26 is located inside the sealing cylinder 22 and a sealing ring is provided on the outside. Thus, when the valve stem 26 moves upward with the valve plate mechanism 4, external airflow can be prevented from entering the buffer chamber 16.

[0026] In this embodiment, sealing plates 32 are installed on both the upper and lower sides of the piston disc 31, and a receiving ring 33 is fixedly connected to the middle of the upper part of the piston disc 31. The bottom end of the buffer spring 34 is located on the periphery of the receiving ring 33. The periphery of the piston disc 31 fits against the inner wall of the buffer cavity 16, and the periphery of the sealing plate 32 is interference-fitted against the inner wall of the buffer cavity 16. Since the valve plate mechanism 4 can only slide up and down inside the gate 14, and the cross-section of the buffer chamber 16 is different from that of the gate 14, and with the downward force of the buffer spring 34, the buffer mechanism 3 is relatively stationary when the valve stem 26 moves the valve plate mechanism 4 upward. Only when there is water hammer will the piston disc 31 move upward to compress the air in the buffer chamber 16 and the buffer spring 34.

[0027] In this embodiment, the top ends of the first side valve plate 41 and the second side valve plate 46 are respectively provided with an integral connecting block 411 and a connecting block 461. The bottom end of the valve stem 26 is fixedly connected between the connecting block 411 and the connecting block 461. The sides of the first side valve plate 41 and the second side valve plate 46 are respectively provided with an integral slider 412 and a slider 462. The slider 412 and the slider 462 are both fitted into the inside of the groove 15. Among them, connecting block 2 461 and connecting block 1 411 are both L-shaped, while the bottom of valve stem 26 has a rectangular block, which is stuck between connecting block 1 411 and connecting block 2 461, thereby driving the valve plate mechanism 4 to move up and down as a whole.

[0028] In this embodiment, a ring-shaped set of insertion holes 42 is provided in the middle of the side valve plate 41. A guide rod 43 is inserted into the insertion hole 42. A sealing plate 44 is slidably connected to the inside of the initial buffer cylinder 481. A spring 45 is provided on one side of the sealing plate 44. One end of the guide rod 43 is fixedly connected to the sealing plate 44. The spring 45 surrounds the outer periphery of the guide rod 43. Although both the side valve plate 41 and the side valve plate 46 have locking components 48 on the side that are close to each other, the side valve plate 41 only has the initial buffer cylinder 481 in the locking component 48, and does not have a linkage ring 487 and a limit wedge 484. Therefore, the sealing plate 44 can slide left and right in the two initial buffer cylinders 481.

[0029] In this embodiment, the inner wall of the initial buffer cylinder 481 is slidably connected with a ring-shaped distribution of limiting wedges 484, and a connecting arc plate 482 is fixedly connected to one side of the initial buffer cylinder 481. Semi-circular notches 483 are opened at both the upper and lower ends of one side of the initial buffer cylinder 481. The connecting arc plate 482 has a through hole, which allows the side valve plate 41 and the side valve plate 46 to be fixed left and right by bolts through the through hole of the connecting arc plate 482. After the left and right are fixed, the semi-circular notch 483 forms a round hole, which facilitates the flow of water through.

[0030] In this embodiment, the inner wall of the linkage ring 487 is fixedly connected with annularly distributed inclined pressure strips 488, and one side of the limiting wedge block 484 is fixedly connected with a connecting protrusion 485. The connecting protrusion 485 cooperates with the inclined pressure strips 488, and a spring piece 486 is provided at the center point of the limiting wedge block 484 away from the initial buffer cylinder 481. Among them, the side of the limiting wedge block 484 away from the sealing ring 47 is inclined, which facilitates the locking of the sealing plate 44; The inclined pressure strip 488 is arc-shaped and is movably connected inside the initial buffer cylinder 481. The limiting wedge 484 is slidably connected to the groove on the inner wall of the initial buffer cylinder 481 and the annular groove at the rotating connection of the linkage ring 487. This allows the limiting wedge 484 to move through the inclined pressure strip 488 when the linkage ring 487 rotates clockwise, thereby releasing the restriction on the sealing plate 44.

[0031] In this embodiment, the mounting ring 5 is installed on the outside of the primary buffer port 463, and a filter screen 51 is fixedly connected to the middle of the mounting ring 5; The filter screen 51 is a metal mesh with large openings, allowing water hammer to pass through while blocking large solid impurities inside, preventing them from passing through the primary buffer port 463 and entering the buffer chamber 16, thus avoiding affecting the sealing of the buffer mechanism 3.

[0032] The working principle of this invention is as follows: The working process of this invention is divided into four stages: closing the valve, water hammer two-stage buffering and energy dissipation, opening the valve and resetting, and locking component linkage. During the valve closing stage: Rotate handwheel 28, which drives screw 27 to move downward, causing valve stem 26 and valve plate mechanism 4 to move downward along the internal slide groove 15 of gate 14. Side valve plate 1 41 and side valve plate 2 46 descend to close the flow channel, cutting off the medium passage between inlet pipe 12 and outlet pipe 13. During the downward movement of valve plate mechanism 4, rack 18 on support block 17 meshes with tooth groove 489 of linkage ring 487, driving linkage ring 487 to rotate. After the medium in the pipeline is cut off by valve plate mechanism 4, the medium in outlet pipe 13 continues to flow forward due to inertia, forming a negative pressure inside the pipeline. The medium flows back in reverse, forming a high-pressure water hammer impacting side valve plate 2 46. Two-stage water hammer buffering and energy dissipation stage: After the valve plate mechanism 4 is fully closed, the locking component 48 releases the limiting constraint on the sealing plate 44. The water hammer impact medium passes through the filter screen 51 and the primary buffer port 463, pushing the sealing plate 44 to move towards the side valve plate 41, compressing the spring 45, and completing the primary buffering energy absorption. After the sealing plate 44 is pushed open, the impact medium enters the upper buffer chamber 16 through the primary buffer cylinder 481 and the semi-circular notch 483, pushing the piston disc 31 to slide upward, compressing the upper buffer spring 34 and the sealed air inside the buffer chamber 16. The secondary buffering energy absorption is achieved by relying on the elasticity of the buffer spring 34 and the gas compression, dissipating the water hammer impact energy, weakening the water hammer pressure, and achieving water hammer protection. Valve opening and reset phase: Reverse rotation of handwheel 28 causes screw 27 to drive valve stem 26 upward, valve plate mechanism 4 moves upward as a whole, inlet pipe 12 and outlet pipe 13 are reconnected, and the medium in the pipeline resumes flow; buffer spring 34 releases its elastic force, pushing piston disc 31 downward to reset, and the medium remaining in buffer chamber 16 flows back into the pipeline; at the same time, spring 45 pushes sealing plate 44 to reset; during the upward movement of valve plate mechanism 4, rack 18 and linkage ring 487 mesh again, linkage ring 487 rotates, limit wedge 484 extends, locking sealing plate 44 and closing primary buffer port 463; when the valve is fully open or half open, the primary buffer passage is locked to prevent fluid disturbance from causing ineffective reciprocating motion of piston disc 31; Locking component linkage logic: First, the valve plate mechanism 4 closes downward: the rack 18 meshes with the tooth groove 489 to drive the linkage ring 487 to rotate counterclockwise, the inclined pressure strip 488 on the inner wall of the linkage ring 487 squeezes the connecting protrusion 485, and drives the limit wedge block 484 to retract towards the inner side of the initial buffer cylinder 481, releasing the mechanical lock on the sealing plate 44, and the sealing plate 44 can be opened by water hammer impact, and the buffer passage takes effect. Secondly, the valve plate mechanism 4 opens upward: the rack 18 drives the linkage ring 487 to rotate, the inclined pressure strip 488 disengages from the compression of the connecting protrusion 485, the spring plate 486 drives the limiting wedge block 484 to extend towards the center of the primary buffer cylinder 481, limit and lock the sealing plate 44, close the primary buffer passage, and the buffer mechanism 3 stops working. In addition, the buffer chamber 16 can be filled and emptied through the air injection port 25, and the pressure gauge 24 displays the air pressure of the buffer chamber 16 in real time. The buffer pre-pressure can be adjusted according to the pipeline conditions. The filter screen 51 continuously blocks large particles of impurities to prevent impurities from entering the buffer chamber 16 and causing the mechanism to jam.

[0033] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve body structure for a water hammer buffer type protective gate valve with a buffer chamber, comprising a valve body mechanism (1), characterized in that: A valve cover mechanism (2) is provided above the valve body mechanism (1), a buffer mechanism (3) and a valve plate mechanism (4) are provided inside the valve body mechanism (1), and an installation ring (5) is provided on one side of the valve plate mechanism (4). The valve body mechanism (1) includes a valve seat (11) and a gate (14) that is connected vertically inside the gate (14). A support block (17) is provided inside the gate (14). The valve cover mechanism (2) includes a valve cover (21) and a connecting ring (23) on the inner side below the valve cover (21). A sealing cylinder (22) is fixedly connected to the top of the valve cover (21). Screws (27) are slidably connected to the inside of both the valve cover (21) and the sealing cylinder (22). A valve stem (26) is fixedly connected to the bottom of the screw (27). The buffer mechanism (3) includes a piston disc (31) and a buffer spring (34) above it. The piston disc (31) is slidably connected to the periphery of the valve stem (26). The valve plate mechanism (4) includes a side valve plate one (41) and a side valve plate two (46) distributed on the left and right. A locking component (48) is provided on the side where the side valve plate one (41) and the side valve plate two (46) are close to each other. A primary buffer port (463) is opened in the middle of the side valve plate two (46). The locking assembly (48) includes a primary buffer cylinder (481) and a rotating linkage ring (487) connected to its periphery.

2. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 1, characterized in that: The valve seat (11) is provided with an integral inlet pipe (12) and outlet pipe (13) on both sides. The inner walls of the gate (14) are provided with grooves (15). The support block (17) is fixedly connected to the inner wall of one of the grooves (15). The support block (17) is fixedly connected to a rack (18) on the side of the side valve plate (46). The linkage ring (487) is provided with a toothed groove (489) on one side. The rack (18) cooperates with the toothed groove (489).

3. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 1, characterized in that: The top port of the valve seat (11) is fixedly connected with annularly distributed bolts (19), which penetrate the valve cover (21) and are connected by nuts. The side valve plate 2 (46) and the side valve plate 1 (41) are respectively provided with sealing rings (47) on the side away from each other. The sealing rings (47) fit the inner wall of the gate (14).

4. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 1, characterized in that: A pressure gauge (24) is inserted into one side of the valve cover (21), and an air injection port (25) is provided on the other side of the valve cover (21). A connecting ring (23) is fixedly connected to the inner wall of the valve cover (21). The connecting ring (23) is fitted to the inner side of the top of the buffer spring (34). A handwheel (28) is rotatably connected to the top of the sealing cylinder (22). The handwheel (28) is threadedly connected to the outer periphery of the screw (27).

5. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 1, characterized in that: The piston disc (31) is equipped with sealing plates (32) on both the upper and lower sides. A receiving ring (33) is fixedly connected to the middle of the upper part of the piston disc (31). The bottom end of the buffer spring (34) is located on the periphery of the receiving ring (33). The periphery of the piston disc (31) fits against the inner wall of the buffer cavity (16). The periphery of the sealing plate (32) is interference-fitted against the inner wall of the buffer cavity (16).

6. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 1, characterized in that: The top ends of the first side valve plate (41) and the second side valve plate (46) are respectively provided with an integral connecting block 1 (411) and a connecting block 2 (461). The bottom end of the valve stem (26) is fixedly connected between the connecting block 1 (411) and the connecting block 2 (461). The sides of the first side valve plate (41) and the second side valve plate (46) are respectively provided with an integral slider 1 (412) and a slider 2 (462). The slider 1 (412) and the slider 2 (462) are both fitted inside the slide groove (15).

7. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 6, characterized in that: The side valve plate (41) has a ring-shaped set of insertion holes (42) in the middle. A guide rod (43) is inserted into the insertion hole (42). A sealing plate (44) is slidably connected to the inside of the initial buffer cylinder (481). A spring (45) is provided on one side of the sealing plate (44). One end of the guide rod (43) is fixedly connected to the sealing plate (44). The spring (45) surrounds the guide rod (43).

8. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 1, characterized in that: The inner wall of the initial buffer cylinder (481) is slidably connected with a ring-shaped distribution of limiting wedges (484), and a connecting arc plate (482) is fixedly connected to one side of the initial buffer cylinder (481). Semi-circular notches (483) are opened at both the upper and lower ends of one side of the initial buffer cylinder (481).

9. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 8, characterized in that: The inner wall of the linkage ring (487) is fixedly connected with annularly distributed inclined pressure strips (488), and a connecting protrusion (485) is fixedly connected to one side of the limiting wedge (484). The connecting protrusion (485) cooperates with the inclined pressure strips (488), and a spring piece (486) is provided at the center point of the limiting wedge (484) away from the initial buffer cylinder (481).

10. The valve body structure of a water hammer buffer type protective gate valve with a buffer chamber according to claim 1, characterized in that: The mounting ring (5) is installed on the outside of the primary buffer port (463), and a filter screen (51) is fixedly connected to the middle of the mounting ring (5).

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