Swing check valve

Abstract

The invention discloses a swing check valve, which relates to the technical field of valves, and comprises a valve clack part which is arranged in a valve body, comprises a rocker and a valve plate, and is used for enabling the rocker to be matched with the valve plate to rotate in the valve body, so that a forward fluid is opened when flowing through the valve body, and a reverse fluid is closed when flowing through the valve body; the drainage part is arranged on the side face of the valve clack part and comprises a sleeve and a baffle, and the sleeve and the baffle are used for conducting partial pressure relief on forward small-flow guiding and reverse fluid; the movable part is arranged at the bottom of the drainage part, comprises a connecting part and an inclined block and is used for enabling the inclined block to move in the connecting part so that the valve clack part can be limited and fixed when being closed and completely opened, the valve plate can better cope with a large amount of changed fluid, the impact of the valve plate and the valve seat is buffered, part of impulsive force of the valve plate is consumed, and the service life of the valve plate is prolonged. The buffering and damping effects are achieved, large vibration and noise are avoided, and the situation that the valve plate frequently knocks the check block to cause internal abrasion due to small-amplitude changing fluid is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a swing check valve. Background Technology

[0002] A check valve is an automatically operating valve whose core function is to allow fluid to flow in only one direction and prevent flow in the opposite direction. It does not require manual operation or external control, relying on the fluid's own power to open and close. The main function of a check valve is to prevent backflow of the medium, thereby protecting equipment in the pipeline system and avoiding possible accidents or efficiency losses. Among them, the swing check valve is a check valve that opens and closes by rotating the valve disc around a pin on the valve body. When open, the valve disc "hovered" in the flow channel like a hinged door, with very little obstruction to the fluid.

[0003] Chinese Patent Publication No. CN110388484B discloses a swing check valve, including a valve body with an inlet flow channel, an outlet flow channel and an inner cavity; a valve cover fixedly connected to the valve body; a valve seat; a rotating shaft; a rocker arm; a valve disc; a connecting shaft with one end fixedly connected to the rotating shaft and the other end having a spiral groove; and a buffer assembly including a buffer block, a buffer cover, a buffer piston, a damping rod and a one-way valve plate.

[0004] Chinese Patent CN110762259A discloses a swing check valve. The valve body is equipped with an online maintenance valve seat disassembly device. The valve seat disassembly device includes a positioning plate, a positioning shaft, a discharge body, and a telescopic sleeve. The positioning plate can replace the cover plate and is installed on the front and rear sides of the valve body. The positioning shaft is arranged horizontally front and back and its two ends are respectively installed on the positioning plate. The discharge body is adjustable and can be moved back and forth on the positioning shaft. The telescopic sleeve is adjustable and can be rotated circumferentially and moved axially in the guide groove on the left side of the discharge body.

[0005] The above-mentioned technical solutions have some problems in use. For example, when a small amount of fluid flows inside the valve body during the use of the existing swing check valve, the fluid is not enough to support the valve disc structure to open to a large extent. This causes the valve disc structure to frequently knock against the valve seat as the fluid volume changes, which in turn causes wear on the valve disc structure and the valve seat and affects the sealing performance of the valve disc structure.

[0006] Furthermore, while the pressure relief component can relieve a small amount of fluid inside the valve body and prevent it from causing the valve disc structure to knock against the valve seat inside the valve body, if the pressure relief component continues to work, the fluid flow will still cause the valve disc structure to continue knocking against the valve body and affect its own structural strength. Over time, the vibration will cause the pipeline to loosen, which will affect the sealing performance of the connections of various parts, resulting in wear or even damage.

[0007] Furthermore, when the valve disc structure opens rapidly under fluid impact, it quickly impacts the top of the valve body as it moves upward. Under the force of gravity or the reverse fluid, the valve disc structure quickly falls back to the valve seat. Therefore, the impact between the valve disc structure and the internal structure of the valve body causes significant vibration and noise, and may even cause wear, which seriously affects the stability of the check valve during use. When the valve disc structure is fully open, the fluid with small fluctuations frequently knocks against the top of the valve body, which affects its service life after long-term use and may also cause the pipeline system to loosen, leading to safety hazards.

[0008] Therefore, it is necessary to invent a swing check valve to solve the above problems. Summary of the Invention

[0009] The purpose of this invention is to provide a swing check valve to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a swing check valve, comprising a valve body, a valve cover bolted to its top, a valve seat installed inside the inlet end of the valve body, and further comprising: The valve disc is located inside the valve body and includes a rocker arm and a valve plate. The rocker arm drives the valve plate to rotate inside the valve body, opening the valve when the fluid flows in the forward direction and closing it when the fluid flows in the reverse direction. The drainage section, located on the valve disc away from the valve seat, includes a sleeve and a baffle, which partially relieve pressure on the forward small flow and the reverse fluid. The movable part, located at the bottom of the drain section, includes a connecting part and an inclined block. The inclined block moves inside the connecting part and limits the valve disc when it is closed and fully open.

[0011] Preferably, the valve body comprises: The shell, which is connected to the inside of the pipeline through the inlet and outlet, is used to guide the unidirectional flow of fluid in the pipeline; The boss is located at the bottom of the housing and has a slot on its top, which is used to limit and fix the valve disc when it is closed.

[0012] Preferably, the valve body further includes: A stop block, located at the top of the housing, is used to prevent the valve disc from rotating when the valve disc is fully open. The locking cylinder is threaded to the bottom of the stop block and is used to limit and fix the valve disc when it is fully open.

[0013] Preferably, the valve disc portion further includes: The drain hole is located inside the valve plate and is used for a small flow rate of fluid passing through the valve body in the forward direction, so that the fluid flowing through the valve body can flow back to relieve pressure. The valve plate is connected to the internal hinge of the housing via a rocker arm, and is used to control the unidirectional flow of fluid inside the housing.

[0014] Preferably, the drainage section further includes: A stopper plate is located on the side of the baffle closer to the valve seat and is slidably connected to the inside of the sleeve. The plug is located on the other side of the baffle and is fixed to the plug plate by a connecting rod. Its outer surface is slidably connected to the inside of the sleeve. The plug and the plug plate work together to control the fluid flow inside the sleeve.

[0015] Preferably, the drainage section further includes: An elastic element, which is sleeved between the plug and the sleeve, is used to push the plug and the plug plate to reset; One end of the sleeve is threaded into the drain hole, and the baffle is fixed inside the sleeve.

[0016] Preferably, the baffle, the plug plate, and the plug block are all provided with through holes, and the positions of the through holes on the plug plate and the plug block are corresponding. The through holes on the plug plate and the plug block are misaligned with the through holes on the baffle, so as to block the fluid when the plug plate or the plug block is close to the baffle.

[0017] Preferably, the active part further includes: A wedge-shaped body, one end of which slides through into the connecting part and is slidably connected with the wedge-shaped inclined block. An elastic element is installed between the wedge and the connecting part to push the wedge-shaped body to move and reset in the slot, so that one end of the wedge-shaped body fits tightly with the inclined block. The connecting part is fixed to the bottom of the sleeve. The inclined block passes through the sleeve and is fixedly connected to the bottom of the plug. The inclined block and the sleeve are slidably connected. When the plug moves, it drives the inclined block to move inside the connecting part.

[0018] The technical effects and advantages of this invention are as follows: 1. In this invention, when the fluid flow rate is small, the plug plate is pushed closer to the baffle, while the plug block is moved further away from the baffle. The fluid flows through the through hole on the plug plate, through the through hole on the baffle, and through the through hole on the plug block. As the fluid flow rate increases to a certain value, the plug block blocks the through hole on the baffle, and the plug plate blocks the through hole on the baffle, so that the valve plate can be opened to allow flow. This avoids the valve plate frequently hitting the valve seat, which would cause wear on the valve plate and valve seat, and ensures the sealing effect between the valve plate and valve seat, thereby extending the service life of the valve plate and valve seat.

[0019] 2. In this invention, when the valve plate falls under its own weight or is propelled by the reverse fluid, the inclined surface at the bottom of the wedge and the inclined surface at the top of the boss come into contact and rub against each other, thereby slowing down the falling speed of the valve plate and reducing the impact force between the valve plate and the valve seat. This provides a buffering effect on the impact between the valve plate and the valve seat. Finally, the wedge is locked in the slot to ensure a tight seal between the valve plate and the valve seat, preventing external vibration from affecting the fit between the valve plate and the valve seat, and reducing noise and vibration when the valve plate and the valve seat are in contact.

[0020] 3. In this invention, when the valve plate falls under its own gravity or is pushed by the reverse fluid, the wedge moves upward in contact with the boss, causing the wedge to push the inclined block to move the plug and the plug plate. The plug plate gradually moves closer to the baffle, while the plug gradually moves away from the baffle. The reverse fluid flows and releases pressure between the plug, the baffle and the through holes on the plug plate, thereby reducing the damage of the water hammer effect to the valve plate and enabling the valve plate to be used stably in subsequent processes.

[0021] 4. In this invention, the plug and the stop block make contact and impact slowly, while converting part of the impact force of the valve plate into the friction force between the wedge and the limiting cylinder and gradually consuming it. The part of the impact force that is consumed plays a buffering and shock-absorbing effect, and avoids direct impact that will cause large vibration and noise. When the valve plate is fully opened, the wedge moves to the groove on the inclined surface of the locking cylinder side wall and is limited, which avoids the small changes in fluid pushing the valve plate to frequently hit the stop block and cause internal wear or pipeline loosening, making the valve plate more stable when fully opened. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the valve disc closing structure of the present invention; Figure 4 This is a schematic diagram of a partial closing structure of the valve disc portion of the present invention; Figure 5 This is a schematic cross-sectional view of the valve disc portion closing structure of the present invention; Figure 6 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the drainage section structure of the present invention; Figure 8 This is a schematic diagram of the valve disc opening structure of the present invention; Figure 9 This is a schematic diagram of a partial opening structure of the valve disc portion of the present invention; Figure 10 This is a schematic cross-sectional view of the valve disc opening structure of the present invention; Figure 11 For the present invention Figure 10 Enlarged structural diagram at point B.

[0023] In the diagram: 1. Valve body; 101. Housing; 102. Boss; 103. Slot; 104. Stop; 105. Locking cylinder; 2. Valve cover; 3. Valve seat; 4. Valve disc; 401. Rocker arm; 402. Valve plate; 403. Drain hole; 5. Drainage part; 501. Sleeve; 502. Baffle; 503. Plug plate; 504. Connecting rod; 505. Plug; 506. Elastic element; 507. Through hole; 6. Moving part; 601. Connecting part; 602. Inclined block; 603. Wedge; 604. Elastic element. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1 During the operation of the swing check valve, the fluid overcomes the weight of the valve plate 402 and frictional resistance, pushing the valve plate 402 to rotate around the pin shaft via the rocker arm 401. However, when a small amount of fluid flows, due to the weight of the valve plate 402 itself, the fluid cannot support the valve plate 402 to open to a large extent, causing the valve plate 402 to frequently strike the valve seat 3. Furthermore, the valve plate 402 quickly falls back to the valve seat 3 under the force of gravity or the reverse fluid. At this time, the valve plate 402 and the valve seat 3 have a large impact, generating significant vibration and noise. Over time, both the valve plate 402 and the valve seat 3 will wear down, and the sealing degree between the valve plate 402 and the valve seat 3 will continuously decrease, thus affecting the service life of the check valve. Moreover, when the reverse fluid pushes the valve plate 402 to reset, water hammer is very likely to occur, which will damage the valve body 1 and the pipeline system. That is, the fluid in the pipeline is suddenly decelerated, and the inertia of the fluid causes the pressure in the pipeline to rise sharply. The pressure fluctuation strikes the pipeline, generating a huge noise and destructive force.

[0026] This invention provides, for example Figures 1 to 7 The swing check valve shown includes: a valve body 1, on which a valve cover 2 is bolted and fixedly connected to the valve body 1 by bolts, for disassembling the valve cover 2 to repair or replace the internal parts of the valve body 1; a valve seat 3 is installed inside the water inlet end of the valve body 1, and the valve seat 3 and the valve disc 4 are elastically sealed to ensure a seal when fluid is blocked between the valve seat 3 and the valve disc 4.

[0027] The valve body 1 includes a housing 101, which is connected to the inside of the pipeline through an inlet and an outlet end, for guiding the unidirectional flow of fluid in the pipeline; the valve body 1 also includes a boss 102, which is set at the bottom inside the housing 101, and has a slot 103 on its top, for limiting and fixing the valve disc 4 when it is closed, so that the wedge 603 is locked in the slot 103 and restricts the movement of the valve plate 402, ensuring that the valve plate 402 and the valve seat 3 fit and seal, and preventing the valve plate 402 from hitting the valve seat 3 when not in use, thereby affecting the sealing effect between the valve plate 402 and the valve seat 3; a stop block 104, which is set at the top inside the housing 101, for blocking the rotation of the valve disc 4 when it is fully open; and a locking cylinder 105, which is threaded to the bottom of the stop block 104, for limiting and fixing the valve disc 4 when it is fully open, in conjunction with the movable part 6.

[0028] The valve disc 4, located inside the valve body 1, includes a rocker arm 401 and a valve plate 402. The rocker arm 401 rotates inside the valve body 1 in conjunction with the valve plate 402, opening when fluid flows in the forward direction and closing when fluid flows in the reverse direction. The valve disc 4 also includes a drain hole 403, which is located on the valve plate 402. This drain hole is used for small-flow forward flow inside the valve body 1 or to relieve pressure from backflow of fluid inside the valve body 1, thereby preventing frequent flow of fluid through the valve plate 402 when only a small amount of fluid is flowing through it. The valve seat 3 is tapped frequently to avoid water hammer when the backflowing fluid pushes the valve plate 402 to reset. The valve plate 402 is connected to the inside of the housing 101 by a rocker arm 401 and is used to control the unidirectional flow of fluid inside the housing 101. The pressure at the inlet end of the housing 101 is higher than the pressure at the outlet end. The fluid pushes the valve plate 402 to rotate and open inside the housing 101 via the rocker arm 401. When the pressure at the inlet end drops or backflow occurs, the valve plate 402 falls back under its own weight to cut off the flow path.

[0029] The drainage section 5 is located on the side of the valve disc section 4. It includes a sleeve 501 and a baffle 502. The sleeve 501 and the baffle 502 provide partial pressure relief for the forward small flow and the reverse fluid. The drainage section 5 also includes a plug plate 503, which is located on the side of the baffle 502 near the valve seat 3 and is slidably connected to the inside of the sleeve 501. A plug block 505 is located on the other side of the baffle 502 and is fixed to the plug plate 503 by a connecting rod 504. The outer surface of the plug block 505 near the baffle 502 is slidably and sealingly connected to the inside of the sleeve 501. An elastic element 506 is fitted onto one end of the plug 505, which is away from the baffle 502. This element is positioned in the gap between the plug 505 and the sleeve 501 and is used to push the plug 505 and the plug plate 503 back to their original positions. One end of the sleeve 501 is threaded into the drain hole 403. The baffle 502 is fixed inside the sleeve 501. Through holes 507 are provided on the baffle 502, the plug plate 503, and the plug 505. The through holes 507 on the plug plate 503 and the plug 505 are aligned, while the through holes 507 on the plug plate 503 and the plug 505 are misaligned with the through hole 507 on the baffle 502. This misalignment allows the plug plate 503 or the plug 505 to be properly positioned. When 505 is close to the baffle 502, it blocks the fluid. When the fluid flow rate is small, the fluid pushes the plug 503 to gradually approach the baffle 502. The plug 505 separates from the baffle 502 and gradually moves away from the baffle 502. The fluid flows through the through hole 507 on the plug 503, through the through hole 507 on the baffle 502, and through the through hole 507 on the plug 505. This avoids the valve plate 402 from frequently hitting the valve seat 3. As the fluid flow rate increases to a certain value, the plug 505 blocks the through hole 507 on the baffle 502, and the plug 503 blocks the through hole 507 on the baffle 502. This causes the fluid flow rate to reach a certain value and push the valve plate 402 to open.

[0030] The movable part 6 is located at the bottom of the drainage part 5. It includes a connecting part 601 and an inclined block 602. The inclined block 602 moves inside the connecting part 601 and limits and fixes the valve disc part 4 when it is closed and fully opened. When the fluid flow gradually increases to a certain extent, the elastic element 604 pushes the wedge 603 to move when the inclined block 602 moves, so that the inclined block 602 and the wedge 603 are in contact, thereby causing the wedge 603 to move upward out of the slot 103.

[0031] The movable part 6 also includes: a wedge-shaped body 603, one end of which slides through into the connecting part 601 and is slidably connected to the wedge-shaped block 602. An elastic element 604 is installed between the wedge-shaped body 603 and the connecting part 601 for the wedge-shaped body 603 to move and reset in the slot 103 driven by the wedge-shaped block 602, so that one end of the wedge-shaped body 603 is tightly fitted with the wedge-shaped block 602. The connecting part 601 is fixed to the bottom of the sleeve 501 and has a groove. The wedge-shaped block 602 passes through the groove and is fixedly connected to the bottom of the plug 505. When the plug 505 moves, it can drive the wedge-shaped block 602 to move inside the connecting part 601. When the wedge 603 rubs against the top of the boss 102, it moves upward, which buffers the impact between the valve plate 402 and the valve seat 3. The wedge 603 pushes the inclined block 602 to move, which in turn drives the plug block 505 and the plug plate 503 to move. The reverse fluid flows through the through hole 507 on the plug block 505, through the through hole 507 on the baffle 502, and through the through hole 507 on the plug plate 503 to release pressure, thereby reducing the damage of water hammer effect to the valve plate 402. The wedge 603 engages with the inclined block 602 in a wedge-shaped fit, causing the stopper plate 503 and the stopper block 505 to move a distance less than the distance between the end of the groove near the baffle 502 and the baffle 502. When the stopper plate 503 and the stopper block 505 move out of alignment with the baffle 502, the sleeve 501 and the left end of the stopper block 505 maintain a sealed sliding connection, and the fluid inside the sleeve 501 will not enter the connection part 601 along the groove and cause any impact. At the same time, the distance between the wedge 603 and the slot 103 is less than the distance between the wedge 603 and the groove 103. When the wedge 603 moves upward along the connection part 601 to the maximum distance under the elastic force of the elastic element 604, the wedge 603 and the slot 103 disengage from each other, and the valve plate 402 and the rocker arm 401 rotate.

[0032] In summary, during use, the two ends of the housing 101 are connected to pipelines, and the fluid in the pipelines enters the interior of the housing 101. When the pressure at the inlet end of the housing 101 is higher than the pressure at the outlet end, and overcomes the self-weight and frictional resistance of the valve plate 402, the fluid pushes the valve plate 402 to separate from the valve seat 3. The valve plate 402 rotates outward and upward around the pin axis via the rocker arm 401, opening the channel. When the pressure at the inlet end drops or the fluid stops flowing, the valve plate 402 begins to fall back under its own gravity. If backflow occurs, the reverse-flowing fluid will accelerate the closing action of the valve plate 402, and the valve plate 402 will eventually fit tightly back onto the valve seat 3, cutting off the flow path.

[0033] When the fluid flow rate is small, the fluid pushes the plug plate 503 inside the sleeve 501 to move through the drain hole 403, causing the plug plate 503 to gradually approach the baffle 502. As the plug plate 503 moves, it drives the connecting rod 504 to move. When the connecting rod 504 slides inside the baffle 502, it causes the plug block 505 to separate from the baffle 502, causing the plug block 505 to gradually move away from the baffle 502. The plug block 505 moves inside the sleeve 501 and compresses the elastic element 506. At this time, the internal passage of the sleeve 501 is opened. The fluid flow rate determines the moving distance of the plug plate 503 and the plug block 505. The fluid flows through the passage between the through holes 507, avoiding the valve plate 402 from frequently hitting the valve seat 3 when a small amount of fluid is flowing through, ensuring the fit between the valve plate 402 and the valve seat 3, and improving the service life of the valve plate 402 and the valve seat 3.

[0034] It should be noted that, at this time, because the movement distance of the plug 505 is small, the movement distance of the inclined block 602 driven by the plug 505 is small, and the inclined block 602 still maintains the compression of the wedge 603, so that the wedge 603 remains inserted in the slot 103, so that the valve plate 402 will not be opened, effectively avoiding the valve plate 402 from frequently hitting the valve seat 3 when a small amount of fluid flows. When the fluid flow rate gradually increases to a certain level, and the plug plate 503 moves to fit against the baffle 502, since the positions of the through holes 507 on the plug plate 503 and the plug block 505 correspond and are misaligned with the through holes 507 on the baffle 502, the through holes 507 cannot connect, thus blocking the fluid. As the moving distance of the plug block 505 increases, the moving distance of the inclined block 602 driven by the plug block 505 increases. The inclined block 602 no longer maintains the squeezing of the wedge 603. Under the elastic force of the elastic element 604, it drives the wedge 603 to move upward, so that the wedge 603 disengages from the slot 103, thereby ensuring that when the fluid flow rate reaches a certain level, it can push the valve plate 402 to open better, allowing a larger flow rate of fluid to flow through the opened valve plate 402.

[0035] When fluid flow stops and closure is required, valve plate 402 falls under its own weight or the force of the reverse fluid. At this time, under the elastic force of elastic element 506, it pushes plug 505 to move quickly to the left, causing plug 505 to drive connecting rod 504 and plug plate 503 to reset. This causes plug 505 to quickly fit with baffle 502 and valve plate 402 to gradually fall and block the reverse passage. Plug 505 also drives inclined block 602 to move to the left, pushing wedge 603 to move downward and reset. When wedge 603 moves with valve plate 402 to the top of boss 102, the bottom inclined surface of wedge 603 contacts and rubs against the top inclined surface of boss 102, converting some of the kinetic energy of valve plate 402 into friction, slowing down the falling speed of valve plate 402, and achieving the purpose of delaying the falling of valve plate 402. This reduces the impact kinetic energy between valve plate 402 and valve seat 3 and weakens the water hammer effect when fluid flow is blocked.

[0036] During the closing process of valve plate 402, wedge 603 first contacts boss 102 and moves upward. At this time, it pushes inclined block 602 to move to the right, causing inclined block 602 to drive plug block 505 and plug plate 503 to move. Thus, plug plate 503 gradually approaches baffle 502, and plug block 505 gradually moves away from baffle 502 and compresses elastic element 506. Plug plate 503 and plug block 505 are connected to through hole 507 in baffle 502. At this time, the reverse fluid can pass through through hole 507 for partial pressure relief, further weakening the water hammer effect when fluid flow is blocked, thereby better protecting valve body 1 and pipeline system. The sound and destructive force generated by the slight pressure fluctuations hitting the pipeline, when the bottom of the wedge 603 reaches the position of the slot 103 in the boss 102, the wedge 603 falls and engages with the slot 103. The elastic element 506 pushes the plug 505 and the plug plate 503 to move to the left and reset, blocking the passage between the through holes 507 again, avoiding a large amount of backflow affecting the pipeline system. Furthermore, the wedge 603 is fixed in the slot 103, further restricting the valve plate 402 and the valve seat 3 to make tight contact for sealing, avoiding external vibrations that cause the valve plate 402 to shake and frequently hit the valve seat 3, affecting the fit between the valve plate 402 and the valve seat 3.

[0037] Example 2 Based on the above embodiments, after the valve plate 402 is opened, it needs to face a large amount of fluid impact. Usually, the valve plate 402 moves upward rapidly and hits the stop block 104 inside the housing 101, generating large vibrations and noise. Since the valve plate 402 needs to be moved by the fluid, the thickness and weight of the valve plate 402 should not be too large. If the valve plate 402 directly contacts the impact, it will affect its service life. Moreover, when the fluid pushes the valve plate 402 to fully open, it is usually difficult to ensure the stability of the fluid flow in the pipeline. The fluid with small flow changes pushes the valve plate 402 to frequently hit the stop block 104, which not only affects the service life of the valve plate 402, but also causes the pipeline to loosen over time, affecting the sealing performance of the connections of various parts. In addition, the impact causes wear, thereby affecting the service life of the check valve.

[0038] like Figures 8 to 11 The swing check valve shown includes a stop block 104 in the valve body 1, which is located at the top inside the housing 101 and is used to prevent the valve disc 4 from rotating when it is fully open; and a locking cylinder 105, which is threaded to the bottom of the stop block 104 for easy replacement and maintenance, and is used to limit and fix the valve disc 4 in conjunction with the movable part 6 when it is fully open. When the valve plate 402 is about to be fully opened, the wedge 603 rises with the valve plate 402, and the bottom inclined surface of the locking cylinder 105 pushes the wedge 603 to move into the connecting part 601. The bottom arc surface of the wedge 603 rubs against the bottom inclined surface of the locking cylinder 105, thereby gradually consuming the upward force of the valve plate 402 and buffering and damping the impact of the plug 505 and the stop block 104.

[0039] In summary, when the valve plate 402 is about to reach its maximum opening position, the plug 505 contacts the stop block 104. Since the plug 505 is slidably connected to the sleeve 501 and the elastic element 506 is compressed, part of the impact force is converted into the elastic force of the elastic element 506 and the friction force between the plug 505 and the sleeve 501. Thus, the impact force is partially consumed, which plays a buffering and shock-absorbing role, avoiding direct impact between the valve plate 402 and the stop block 104, ensuring the subsequent use effect of the valve plate 402, and thus extending the service life of the valve plate 402.

[0040] Furthermore, the bottom arc surface of the wedge 603 contacts and rubs against the bottom inclined surface of the locking cylinder 105, converting part of the impact between the wedge 603 and the locking cylinder 105, i.e., part of the upward impact force of the valve plate 402, into a contact friction force with the bottom inclined surface of the locking cylinder 105. As the valve plate 402 gradually opens completely, the stop block 104 squeezes the plug 505 closer to the baffle 502, while the plug plate 503 gradually moves away from the baffle 502. At this time, the plug 505 and the stop block 104 are in continuous contact. At the same time, the plug 505 drives the inclined block 602 to move gradually. The inclined block 602 pushes the wedge 603 to gradually extend outward into the groove in the bottom inclined surface of the locking cylinder 105 for limiting and fixing. When the fluid flow rate in the pipeline changes slightly, the valve plate 402 is locked and fixed by the wedge 603, and the plug 505 and the stop block 104 remain in contact. Therefore, the position of each part of the structure is limited by the wedge 603 and is difficult to vibrate slightly, thereby reducing the wear caused by impact and improving the service life of the check valve.

[0041] When the inlet pressure drops or the fluid flows backward, causing the valve plate 402 to begin to fall under its own weight, the stop block 104 and the plug block 505 begin to separate. At the same time, the wedge 603 moves away from the locking cylinder 105. The wedge 603 pushes the inclined block 602 and the plug block 505 away from the baffle 502 and compresses the elastic element 506. As a result, the stop block 104 and the plug block 505 separate after being in contact for a period of time during the fall of the valve plate 402. The bottom of the wedge 603 gradually moves out of the groove on the side of the locking cylinder 105 and gradually separates from the locking cylinder 105. The valve plate 402 continues to fall until it resets or repeats the above process according to the change in fluid flow.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A swing check valve, comprising a valve body (1), a valve cover (2) bolted to its top, and a valve seat (3) installed inside the inlet end of the valve body (1), characterized in that, Also includes: The valve disc (4) is located inside the valve body (1) and includes a rocker arm (401) and a valve plate (402). The rocker arm (401) drives the valve plate (402) to rotate inside the valve body (1). The valve is opened when the fluid flows in the forward direction through the valve body (1) and closed when the fluid flows in the reverse direction through the valve body (1). The drain section (5) is located on the side of the valve disc section (4) away from the valve seat (3), and includes a sleeve (501) and a baffle (502). The sleeve (501) and the baffle (502) partially depressurize the forward small flow and the reverse fluid. The movable part (6) is located at the bottom of the drain part (5) and includes a connecting part (601) and an inclined block (602). The inclined block (602) moves inside the connecting part (601) and limits the valve disc part (4) when it is closed and fully opened.

2. The swing check valve according to claim 1, characterized in that, The valve body (1) includes: The shell (101) is connected to the inside of the pipeline through the inlet and outlet ends, and is used to guide the unidirectional flow of fluid in the pipeline; A boss (102) is located at the bottom of the housing (101), and a slot (103) is provided on its top for limiting and fixing the valve disc (4) in conjunction with the movable part (6) when the valve disc (4) is closed.

3. A swing check valve according to claim 2, characterized in that, The valve body (1) also includes: A stop (104) is provided at the top inside the housing (101) to prevent the valve disc (4) from rotating when the valve disc (4) is fully open; The locking cylinder (105) is threaded to the bottom of the stop block (104) and is used to limit and fix the valve disc (4) in conjunction with the movable part (6) when the valve disc (4) is fully open.

4. A swing check valve according to claim 2, characterized in that, The valve disc portion (4) further includes: Drain hole (403) is opened inside valve plate (402) for forward flow of small flow through valve body (1) to allow the fluid flowing through valve body (1) to flow back and relieve pressure. The valve plate (402) is connected to the interior hinge of the housing (101) via a rocker arm (401) to control the unidirectional flow of fluid inside the housing (101).

5. A swing check valve according to claim 1, characterized in that, The drainage section (5) also includes: A stopper plate (503) is located on the side of the baffle (502) near the valve seat (3) and is slidably connected to the inside of the sleeve (501); The plug (505) is located on the other side of the baffle (502) and is fixed to the plug plate (503) by the connecting rod (504). Its outer surface is slidably connected to the inside of the sleeve (501). The plug (505) and the plug plate (503) work together to control the fluid flow inside the sleeve (501).

6. A swing check valve according to claim 5, characterized in that, The drainage section (5) also includes: An elastic element (506) is sleeved between the plug (505) and the sleeve (501) to push the plug (505) and the plug plate (503) to reset; One end of the sleeve (501) is threaded into the drain hole (403), and the baffle (502) is fixed inside the sleeve (501).

7. A swing check valve according to claim 5, characterized in that, The baffle (502), plug plate (503) and plug block (505) are all provided with through holes (507), and the through holes (507) on the plug plate (503) and plug block (505) are in corresponding positions. The plug plate (503) and plug block (505) are misaligned with the through holes (507) on the baffle (502) to block the fluid when the plug plate (503) or plug block (505) is close to the baffle (502).

8. A swing check valve according to claim 6, characterized in that, The active section (6) also includes: A wedge (603) has one end that slides through into the connecting part (601) and slides in a wedge-shaped fit with the inclined block (602). An elastic element (604) is installed between the wedge (603) and the connecting part (601) to push the wedge (603) to move and reset in the slot (103) so that one end of the wedge (603) fits tightly with the inclined block (602). The connecting part (601) is fixed to the bottom of the sleeve (501). The inclined block (602) passes through the sleeve (501) and is fixedly connected to the bottom of the plug (505). The inclined block (602) is slidably connected to the sleeve (501). When the plug (505) moves, it drives the inclined block (602) to move inside the connecting part (601).

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