Compact side-mounted butterfly valve

Abstract

The invention provides a compact side-mounted butterfly valve. The compact side-mounted butterfly valve comprises a valve body, an execution mechanism and a protection mechanism. The box body is fixed outside the valve body, the executing mechanism is integrated in the box body, and the overall structural layout is optimized by combining the sliding design that the hand wheel is laterally installed and the first rack is parallel to the axis of the valve body, so that the butterfly valve has the advantage of being compact in structure, and is particularly suitable for installation scenes such as a wall where the rotation space of the hand wheel is limited. Sufficient operation space is provided for operators, rotation of the hand wheel and opening and closing operation of the valve plate are more convenient and labor-saving, and adaptability and operation practicability of the butterfly valve in a narrow installation environment are effectively improved. And after the valve plate rotates to the open state, the two baffles of the protection mechanism rotate to the side, facing the water inlet end of the valve cavity, of the sealing ring, so that the sealing ring facing the water inlet end is effectively shielded when the valve cavity is opened, impurities in fluid are prevented from directly impacting and abrading the sealing ring, and the protection effect on the sealing ring is achieved.

Description

Technical Field

[0001] This invention relates to the field of butterfly valves, and in particular to a compact side-mounted butterfly valve. Background Technology

[0002] Butterfly valves are commonly used devices in industrial fluid pipeline systems to control the flow of media. They are especially widely used in scenarios where pipelines need to be fully opened or closed, such as the on / off control of main pipes in water supply and drainage systems, the switching of media transport pipelines in chemical production, and the opening and closing of loops in HVAC systems.

[0003] In practical applications, existing butterfly valves used in fully open / closed scenarios often suffer from an insufficiently compact structural layout. Due to the lack of optimization in the arrangement of the actuator's transmission components and manual operating components, when the butterfly valve is installed in confined spaces such as near walls or equipment, the space around the fully open or fully closed manual operating components is severely compressed. This makes it difficult for operators to apply force smoothly when driving the valve core to complete the opening or closing action, which not only increases the difficulty of operation but may also lead to incomplete pipe connection or disconnection due to incomplete operation, affecting the normal operation of the system and reducing the adaptability of the butterfly valve in confined installation environments. Summary of the Invention

[0004] In view of the shortcomings mentioned above in the background technology, the present invention provides a compact side-mounted butterfly valve.

[0005] The present invention adopts the following technical solution: A compact side-mounted butterfly valve, comprising: The valve body has an externally fixed box. Semi-circular retaining rings are provided on both sides of the valve cavity of the valve body, and the two retaining rings are staggered. A valve plate is fixed to a drive shaft. Semi-circular sealing rings are respectively provided on both sides of the valve plate. The two sealing rings are respectively located on both sides of the drive shaft. The valve plate is located in the valve body, and the drive shaft passes through the valve body to the housing body, so that the valve plate is restricted to rotate relative to the valve cavity. When the valve plate rotates to seal the valve cavity, the two sealing rings press against the two retaining rings respectively. An actuator includes a handwheel, a first rack, a first gear, a first connecting rod, and a second connecting rod. One end of the handwheel is fixed to a first rotating shaft, which passes through the side of the valve body into the housing. The first rack slides within the housing, with its sliding direction parallel to the axis of the valve body. The first gear rotates within the housing and meshes with the first rack. The rotation of the first rotating shaft drives the first gear to rotate. One end of the first connecting rod is fixed to the transmission shaft, and both ends of the second connecting rod are pivotally connected to the first rack and the first connecting rod, respectively. When the handwheel is rotated, the first gear drives the first rack to move, the first rack pulls the second connecting rod, and the second connecting rod, in conjunction with the first connecting rod, drives the transmission shaft to rotate, thereby causing the valve plate to rotate.

[0006] In one possible implementation, a slider is fixed inside the housing, the sliding direction of the slider is parallel to the axis of the valve body, the slider is adapted to connect to a slide rail, the first rack is fixed to the slide rail, a connecting arm is also fixed to one end of the slide rail, and the second connecting rod is pivotally connected to the connecting arm.

[0007] In one possible implementation, the butterfly valve further includes a protective mechanism, which includes a first slider, a drive shaft, a telescopic rod, a movable plate, a baffle, and a swing rod. The first slider is restricted to sliding along a diameter line in the middle of the valve plate; The baffle is an arc-shaped strip with an L-shaped cross-section. The baffle is provided at both the upper and lower ends of the valve plate. The two baffles are restricted to rotate coaxially relative to the valve plate. The baffle is located on the sealing ring side facing the water inlet end of the valve cavity after the valve body is opened. The baffle blocks the annular surface of the valve plate. The swing arm connects the baffle and the first slider, and the two ends of the swing arm are pivotally connected to the baffle and the first slider, respectively. The drive shaft runs through the interior along its axis, one end of the telescopic rod passes through the drive shaft to the interior of the valve plate, and the other end of the telescopic rod is located inside the box; The movable plate is located inside the box and is restricted to linear movement relative to the valve body. The movable plate and the telescopic rod are axially fixed at one end inside the box. The other end of the movable plate is fixed with a second rack. The first rotating shaft is provided with a transmission gear, and the second rack meshes with the transmission gear. When the handwheel rotates, it drives the transmission gear to rotate, causing the second rack to move and simultaneously drive the telescopic rod to extend out of the valve body. The telescopic rod moves in conjunction with the first slider, causing the first slider to push the swing rod to swing the baffle towards the sealing ring, until the two baffles swing to block the sealing ring facing the water inlet end of the valve body.

[0008] In one possible implementation, the protective mechanism further includes a second guide post and a second slider. The second guide post is fixed at one end of the telescopic rod within the cavity of the valve plate. The second guide post is parallel to the axis of the valve body. The second slider passes through the second guide post with a clearance fit. An inclined guide groove is provided on the inner wall of the cavity of the valve plate. A guide pin is provided on one side of the second slider. The guide pin is adapted to slide within the guide groove. When the telescopic rod moves, it drives the second guide post to move. The second guide post drives the second slider to move along the guide groove, causing the second slider to push the first slider to move.

[0009] In one possible implementation, the first slider fixes the third guide post, and the second slider is provided with a guide hole. The third guide post passes through the guide hole with a clearance fit, so that the movement of the second slider pushes the first slider to move.

[0010] In one possible implementation, the telescopic rod is fixed with a third rack inside the cavity of the valve plate, and a rotatable third gear is provided inside the cavity of the valve plate. The first slider is fixed with a fourth rack, and the third gear meshes with the third rack and the fourth rack. When the telescopic rod moves, it drives the third rack to move, which in turn drives the third gear to rotate. The third gear simultaneously drives the fourth rack to move, causing the first slider to move and push the rocker arm to swing the baffle towards the sealing ring until the two baffles swing to block the sealing ring facing the water inlet end of the valve body.

[0011] In one possible implementation, the protective mechanism further includes first guide posts, two first guide posts are fixed in the cavity of the valve plate, and both first guide posts are parallel to the axis of the valve body, with the first slider passing through the two first guide posts in a clearance fit.

[0012] In one possible implementation, an opening is formed on one side of the cavity of the valve plate, and a sealing plate is sealed at this opening. Arc-shaped through slots are provided on both sides of the sealing plate, and both through slots are coaxial with the axis of the valve plate. Two connecting rods are fixed to one side of the baffle, and a connecting plate is fixed to the end of the two connecting rods away from the baffle. Both connecting rods are located on the radius line of the baffle, and the connecting rods located on the radius line of the valve plate are connected and fixed to the connecting plate by a limiting pin, and the limiting pin is adapted to pass through the through slot.

[0013] In one possible implementation, a rotatable connecting shaft is provided inside the box. One end of the connecting shaft is fixed to the first gear, and the other end of the connecting shaft is fixed to the second gear. The transmission gear is a sector gear. When the handwheel is rotated to drive the transmission gear to open the valve plate, the transmission gear first meshes with the second gear, and then the transmission gear meshes with the second rack.

[0014] In one possible implementation, the outer diameter of the valve plate is smaller than the inner diameter of the valve cavity, and the outer diameter of the valve plate is larger than the inner diameter of the retaining ring. Both ends of the valve plate are provided with relief grooves, the two retaining rings are integrally formed, and the same end of the two retaining rings is connected to the filling part. The relief groove is rotated around the filling part.

[0015] As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: By integrating the actuator into the body of the valve body and fixing it inside the housing, and combining the side mounting of the handwheel and the sliding design of the first rack parallel to the valve body axis, the present invention optimizes the overall structural layout, giving the butterfly valve a compact structural feature. It is especially suitable for installation scenarios where the handwheel rotation space is limited, such as near a wall, providing operators with ample operating space and making the handwheel rotation and valve plate opening and closing operations more convenient and labor-saving. It effectively improves the adaptability and operational practicality of the butterfly valve in confined installation environments. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention after the valve plate is closed.

[0017] Figure 2 for Figure 1 A cross-sectional schematic diagram.

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the valve body.

[0019] Figure 4 for Figure 3 A magnified diagram of point A in the middle.

[0020] Figure 5 A three-dimensional structural diagram of the valve plate connecting the actuator.

[0021] Figure 6 This is a three-dimensional structural diagram of the actuator.

[0022] Figure 7 This is a three-dimensional structural diagram of the present invention after the valve plate is opened.

[0023] Figure 8 for Figure 7 A magnified diagram of point B in the middle.

[0024] Figure 9This is a schematic diagram showing the transmission connection between the telescopic rod and the first slider via the third rack, the third gear, and the fourth rack.

[0025] Figure 10 A three-dimensional structural diagram of a sealing plate fixed to one side of the valve plate.

[0026] Figure 11 for Figure 10 A magnified diagram of point C.

[0027] Figure 12 This is a three-dimensional structural diagram of the baffle connected to the connecting plate via a connecting rod.

[0028] Figure 13 for Figure 10 A diagram showing the hidden panel.

[0029] Figure 14 for Figure 13 Enlarged diagram of point D in the middle.

[0030] Figure 15 This is a schematic diagram showing the guide pin of the second slider after it is embedded in the guide groove.

[0031] Figure 16 This is a schematic diagram of the three-dimensional structure of the second slider.

[0032] Figure 17 A three-dimensional structural diagram showing the third guide post for the first slider.

[0033] Figure 18 This is a cross-sectional schematic diagram of the internal structure of the box.

[0034] Figure 19 for Figure 18 A magnified diagram at point E in the middle.

[0035] Figure 20 This is a three-dimensional structural diagram of the limiting component.

[0036] Figure 21 A three-dimensional structural diagram showing the limit component installed within the actuator.

[0037] Figure 22 for Figure 21 A magnified diagram at point F in the middle. Detailed Implementation

[0038] To make the purpose, technical solution, and advantages of the invention clearer, the invention will now be described in further detail with reference to the accompanying drawings.

[0039] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this embodiment, unless otherwise stated, "a plurality of" means two or more.

[0040] Furthermore, in this embodiment, directional terms such as "upper" and "lower" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used to describe and clarify relative positions, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0041] This invention provides a compact side-mounted butterfly valve, as shown in the attached figure. Figures 1 to 4 As shown, the butterfly valve includes a valve body 1, a valve plate 5, an actuator 2, and a protective mechanism 3. The valve body 1 is externally fixed to a housing 4, and the actuator 2 is integrated inside the housing 4 to optimize the overall structural layout. Semi-circular retaining rings 11 are arranged on both sides of the valve cavity of the valve body 1, with the two retaining rings 11 staggered to form a structural basis for proper sealing. A drive shaft 51 is fixed at the center of both ends of the valve plate 5. Semi-circular sealing rings 52 are mounted on both sides of the valve plate 5, symmetrically distributed around the drive shaft 51 and located on both sides of the drive shaft 51. The valve plate 5 is entirely housed within the valve cavity. The two drive shafts 51 penetrate the side walls of the valve body 1, with one end of one drive shaft 51 extending into the housing 4. The interaction between the drive shaft 51 and the valve body 1 limits the valve plate 5 to rotate only relative to the valve cavity.

[0042] As attached Figure 1 and 2 As shown, when the actuator 2 drives the transmission shaft 51 to rotate the valve plate 5 to the valve cavity sealing position, that is, the position between the two retaining rings 11, the sealing rings 52 on both sides of the valve plate 5 form a tight-fitting pressing state with the retaining rings 11 on the corresponding sides of the valve cavity, and a reliable seal is achieved through the precise cooperation between the sealing rings 52 and the retaining rings 11. When the actuator 2 drives the transmission shaft 51 to rotate the valve plate 5 to the valve cavity opening position, as shown in the attached diagram... Figure 7As shown, the valve plate 5 rotates to a state approximately parallel to the valve cavity axis, creating a smooth fluid passage within the valve cavity. At this point, the sealing rings 52 on both sides of the valve plate 5 simultaneously disengage from the corresponding side retaining rings 11. The sealing ring 52 at the water inlet end of the valve body 1 is subjected to the impact of the fluid and the scouring of impurities. To prevent excessive wear, the protective mechanism 3, through linkage control with the actuator 2, forms a shield to protect the sealing ring 52 facing the water inlet end. This structural design ensures the flexibility of the valve plate 5's rotation and enhances the sealing performance through the corresponding compression of the staggered retaining rings 11 and sealing rings 52. Combined with the design of integrating the actuator 2 into the housing 4, this further strengthens the compact nature of the butterfly valve.

[0043] As attached Figures 5 to 7 As shown, the actuator 2 includes a handwheel 21, a first rack 221, a first gear 222, a first connecting rod 231, and a second connecting rod 232. The first rack 221 is slidably mounted inside the housing 4. Its sliding guide structure can be such that a guide slider is fixed to the inner wall of the housing 4, and the guide slider limits the sliding direction to be parallel to the axis of the valve body 1. The guide slider is adapted to connect to a slide rail, and the first rack 221 is fixed to the surface of the slide rail, thereby keeping the sliding direction of the first rack 221 parallel to the axis of the valve body 1. The first gear 222 is fixed to a connecting shaft 25, which is mounted and fixed to a bearing seat fixed inside the housing 4. One end of the connecting shaft 25 is fixed with the first gear 222, ensuring that the first gear 222 and the first rack 221 maintain a stable meshing state to transmit power.

[0044] Continue to refer to the appendix Figures 5 to 7 One end of the first connecting rod 231 is fixed to the transmission shaft 51, and both ends of the second connecting rod 232 are pivotally connected to the first rack 221 and the first connecting rod 231, respectively. As a preferred structural form, the slide rail and one end of the first rack 221 are also jointly fixed with a connecting arm 233. The second connecting rod 232 pivotally engages with this connecting arm 233, thus constructing a transmission structure that is pivotally connected to the first rack 221. The pivotal structure involved in this embodiment can adopt a connection form using bolts or pins. The bolts or pins axially limit the two pivotally connected components, ensuring that the two components can flexibly rotate relative to each other around the axis of the bolts or pins.

[0045] Continue to refer to the appendix Figures 5 to 7One end of the handwheel 21 is fixed with the first rotating shaft 211. The first rotating shaft 211 passes through the side of the valve body 1 into the inside of the box 4. Specifically, bearing seats are fixed on the side walls on opposite sides of the box 4. The first rotating shaft 211 is adapted to be assembled in the corresponding two bearing seats. The bearing seats form axial limit and radial support for the first rotating shaft 211, so that the first rotating shaft 211 can rotate stably inside the box 4. The first rotating shaft 211 and the connecting shaft 25 form a transmission connection. When the operator turns the handwheel 21 to drive the first rotating shaft 211 to rotate, it can synchronously drive the first gear 222 to rotate. The first gear 222 drives the first rack 221 to move along a preset direction through meshing with the first rack 221. During this process, the first rack 221 pulls the second connecting rod 232 through the pivot point, so that the second connecting rod 232 links the first connecting rod 231 with the pivot point as the fulcrum, thereby driving the transmission shaft 51 to rotate around its own axis, realizing the synchronous rotation of the valve plate 5 to complete the opening or closing action of the butterfly valve.

[0046] The aforementioned actuator 2 integrates the handwheel 21 onto one side of the valve body 1, and designs the direction of movement of the transmission components along the line connecting the inlet and outlet ends of the valve body 1. This allows the handwheel 21 to be installed facing outwards when the butterfly valve needs to be installed against a wall or in other scenarios where the space for the handwheel 21 to rotate is limited. Compared to traditional butterfly valves where the handwheel 21 is close to a wall and difficult to rotate, this structure provides ample operating space for the operator, making the rotation of the handwheel 21 more convenient and effortless, effectively improving the adaptability and practicality of the butterfly valve in confined installation environments.

[0047] As attached Figure 7 , 9 As shown in Figure 10, a cavity is provided inside the valve plate 5. The protective mechanism 3 is integrated and arranged inside the cavity of the valve plate 5. As a preferred structural design, an opening is formed on one side of the cavity of the valve plate 5. The valve plate 5 is sealed and fixed at this opening by a detachable connection method using bolts, thereby achieving reliable sealing of the protective mechanism 3 after assembly. The protective mechanism 3 includes a first slider 31, a telescopic rod 32, a movable plate 33, a baffle 34, and a swing rod 35. The first slider 31 is limited and constrained to slide along the diameter line in the middle of the valve plate 5. Its specific limiting and constraining structure can be as follows: two first guide posts 311 are fixed inside the cavity of the valve plate 5. Both first guide posts 311 are parallel to the axis of the valve body 1. The first slider 31 is inserted through the two first guide posts 311 with a clearance fit. The two parallel first guide posts 311 form a limiting and guiding effect on the first slider 31, ensuring that the first slider 31 slides smoothly along the diameter line of the valve plate 5.

[0048] As attached Figure 12As shown, the baffle 34 is designed as an arc-shaped strip that matches the curvature of the valve plate 5, with an L-shaped cross-section to accommodate the sealing ring 52 located on the two outwardly perpendicular sides of the valve plate 5. Baffles 34 are fitted at both the upper and lower ends of the valve plate 5, and both baffles 34 are constrained to rotate concentrically relative to the valve plate 5 only. This rotational constraint can be achieved through the following... Figure 10 The structure shown features arc-shaped through slots 502 on both sides of the sealing plate 53. The trajectory of the through slots 502 is coaxial with the axis of the valve plate 5. Two connecting rods 341 are fixed to one side of the baffle 34. The ends of the two connecting rods 341 away from the baffle 34 are fixed to the connecting plate 342. Both connecting rods 341 are arranged along the radius line of the curvature of the baffle 34. At the position of the connecting rod 341 on the radius line of the baffle 34, a limiting pin 343 connects and fixes it to the connecting plate 342. During assembly, the limiting pin 343 is sequentially inserted through the sealing plate 53, the baffle 34, and the connecting plate 342 and then riveted to ensure that the limiting pin 343 and the through slot 502 fit together. In this linkage structure consisting of connecting rod 341, connecting plate 342, and limiting pin 343, the matching and engagement of the two limiting pins 343 with the through groove 502 strictly constrains the movement trajectory of the baffle 34 to only be able to rotate in a circle relative to the center of the sealing plate 53. After the sealing plate 53 is fixed to the valve plate 5 by bolts, the two baffles 34 are restricted to rotating coaxially relative to the valve plate 5. When the valve body 1 is opened, the two baffles 34 rotate precisely to the side facing the sealing ring 52 at the water inlet end of the valve cavity, so as to effectively shield the sealing ring 52 facing the water inlet end when the valve cavity is opened, avoiding impurities in the fluid from directly impacting and wearing the sealing ring 52. At the same time, the L-shaped cross-section design can improve the comprehensiveness of the shielding and further enhance the protective effect on the sealing ring 52.

[0049] As attached Figure 13 As shown, both baffles 34 and the first slider 31 are connected by a rocker arm 35 to form a linkage relationship. The two ends of the rocker arm 35 are pivotally connected to the baffles 34 and the first slider 31, respectively, and can rotate relative to each other. In this transmission structure, when the first slider 31 moves linearly along the first guide post 311, it transmits the driving force to the two baffles 34 synchronously through the rocker arm 35 connected at both ends. This synchronously drives the two connecting plates 342 to move along the trajectory formed by the through groove 502. The connecting plates 342 drive the baffles 34 fixed to them to rotate circumferentially around the axis of the valve plate 5. Finally, the two baffles 34 are spliced ​​on one side of the valve plate 5, realizing the shielding and protection of the sealing ring 52 and the resetting action of the baffles 34. This synchronous transmission structure, formed by the cooperation of a single slider and a rocker arm 35, ensures that the rotation angles of the two baffles 34 remain consistent, avoiding problems such as lag or deviation in unilateral action. It can promptly block the sealing ring 52 when the valve cavity is open and quickly avoid the sealing ring 52 before the valve cavity is closed. This ensures timely protection without interfering with the sealing action of the butterfly valve, effectively improving the reliability of the coordinated cooperation between the protection mechanism 3 and the main actuator 2 of the butterfly valve.

[0050] The drive shaft 51 runs through its centerline, and one end of the telescopic rod 32 passes through the through hole of the drive shaft 51 into the valve plate 5, while the other end extends into the housing 4. As a preferred sealing solution, an oil seal can be installed inside the through hole of the drive shaft 51. The elastic fit of the oil seal achieves a dynamic seal between the interior of the drive shaft 51 and the telescopic rod 32, effectively preventing fluid from the valve cavity from seeping into the drive shaft 51 and affecting the transmission components. (See attached...) Figure 5 and 13 The movable plate 33 is arranged inside the housing 4 and is subject to linear guiding constraints. The constraint structure can be achieved by fixing two parallel guide rods 41 inside the housing 4 and fixing two linear bearings on the movable plate 33 accordingly. The two guide rods 41 form a sliding fit with the two linear bearings respectively, thereby restricting the movable plate 33 to move only linearly relative to the valve body 1 along the guide rods 41.

[0051] Continue to refer to the appendix Figure 13 One end of the movable plate 33 is axially fixedly connected to the end of the telescopic rod 32 located inside the box 4. Specifically, the connection can be achieved by fixing a bushing 331 on the movable plate 33, assembling a fixed bearing inside the bushing 331, and then assembling a snap ring at the position of the circumferential surface of the telescopic rod 32 corresponding to the bearing end face. Through the axial contact between the snap ring and the bearing end face and the radial positioning of the bearing by the bushing 331, a double constraint is formed on the movable plate 33 and the telescopic rod 32, so that the movable plate 33 can only move axially synchronously with the telescopic rod 32, and cannot rotate circumferentially relative to the telescopic rod 32.

[0052] Please refer to the appendix. Figure 10 A second rack 241 is fixed to the other end of the movable plate 33, and a transmission gear 26 is fixed on the first rotating shaft 211. The second rack 241 and the transmission gear 26 maintain a stable meshing engagement. When the operator turns the handwheel 21 to drive the first rotating shaft 211, the transmission gear 26 rotates synchronously and drives the second rack 241 to move linearly through meshing. The second rack 241 drives the movable plate 33, which is fixedly connected to it, to move synchronously, thereby driving the telescopic rod 32 to move axially relative to the transmission shaft 51. In the specific transmission process, when the handwheel 21 rotates, it drives the transmission gear 26 to rotate, causing the second rack 241 to move along the guide direction and drive the telescopic rod 32 to extend and retract relative to the transmission shaft 51. The telescopic rod 32 transmits linear motion to the first slider 31 inside the valve plate 5, pushing the first slider 31 to move along the guide post. The first slider 31 transmits power to the baffle 34 through the swing rods 35 pivotally connected at both ends, causing the baffle 34 to swing towards the sealing ring 52 until the blocking edges of the two baffles 34 completely cover and block the sealing ring 52 facing the water inlet end of the valve body 1.

[0053] Furthermore, to optimize the coordination of actions, a second gear 251 is fixed to the end of the connecting shaft 25 away from the first gear 222. The transmission gear 26 has a sector gear structure. When the handwheel 21 is operated to rotate the transmission gear 26 to open the valve plate 5, the transmission gear 26 first meshes with the second gear 251, driving the connecting shaft 25 and the first gear 222 to rotate and open the valve plate 5. After the valve plate 5 has rotated to the correct position, the transmission gear 26 disengages from the second gear 251 as the first rotating shaft 211 continues to rotate, and then meshes with the second rack 241 to drive the protective mechanism 3. This phased meshing structure design using sector gears controls the timing of the rotation of the valve plate 5 and the swing of the baffle 34, ensuring that the valve plate 5 completes the opening action first, and then the baffle 34 shields the sealing ring 52. This avoids interference between the two actions and provides timely protection for the sealing ring 52 when the valve cavity is fully open and the fluid flow rate is at its maximum, significantly improving the targeting and reliability of the protective mechanism 3.

[0054] When the telescopic rod 32 moves telescopically relative to the drive shaft 51, the synchronous movement of the first slider 31 can be achieved as shown in the attached figure. Figures 13 to 15 As shown, this is achieved through the linkage of the second slider 36. Specifically, a limit frame 321 is fixed at one end of the telescopic rod 32 located within the cavity of the valve plate 5. A second guide post 322 is fixed inside the limit frame 321, and the second guide post 322 is parallel to the axis of the valve body 1. The second slider 36 is fitted through the second guide post 322 with a clearance fit, and one side of the second slider 36 is close to the limit frame 321. The limiting effect of the limit frame 321 ensures that the second slider 36 can only slide linearly relative to the second guide post 322 and cannot flip. An inclined guide groove 501 is provided on the inner wall of the cavity of the valve plate 5, extending inclinedly upwards and outwards from the center of the valve plate 5. (See attached diagram.) Figure 16 A guide pin 361 is fixed to one side of the second slider 36. The guide pin 361 is fitted into the guide groove 501 and can slide along the groove. This structure, together with the limiting frame 321, forms a double constraint, further ensuring that the second slider 36 can only slide smoothly relative to the second guide post 322 without overturning. Preferably, a roller can be installed on the guide pin 361. The roller is embedded in the guide groove 501, which helps to improve the smoothness of the movement of the second slider 36.

[0055] To ensure that the valve plate 5 remains fixed when rotated to the open or closed state, a fixing seat 13 is installed at the bottom of the valve body 1. The drive shaft 51 below the valve plate 5 passes through the fixing seat 13, and an oil seal is installed between the drive shaft 51 below the valve plate 5 and the fixing seat 13 to achieve sealing without affecting the rotation of the valve plate 5. Two inwardly recessed fixing holes 511 can be provided on the outer circumferential surface of the drive shaft 51 below the valve plate 5. The center lines of the two fixing holes 511 are perpendicular to each other at 90°, and the center line of one of the fixing holes 511 is parallel to the center line of the valve plate 5. The fixing seat 13 is threadedly connected to the side of the fixing bolt 14. During operation, first unscrew the fixing bolt 14 out of the fixing hole 511 of the drive shaft 51. When the valve plate 5 rotates to the open state, one of the fixing holes 511 corresponds to the position of the fixing bolt 14. At this time, screwing the fixing bolt 14 into the fixing seat 13 into the corresponding fixing hole 511 will keep the valve plate 5 in a fixed open state. When the valve plate 5 rotates to the closed state, the other fixing hole 511 corresponds to the position of the fixing bolt 14. At this time, screwing the fixing bolt 14 into the fixing seat 13 into the fixing hole 511 will keep the valve plate 5 in a fixed closed state.

[0056] In addition, to prevent the second rack 241 and the telescopic rod 32 from falling under their own weight, a limiting component can be installed inside the housing 4 to limit their movement. (See attached image) Figures 18 to 22 As shown, the limiting assembly includes a column 381, a locking element 382, ​​and a second spring 383. The column 381 is fixed inside the housing 4 and close to the side of the second rack 241. The column 381 has a hexagonal hole at a preset height close to the axis of the transmission gear 26. The second rack 241 has a first locking hole 2411 and a second locking hole 2412 on the side opposite to the transmission gear 26. The first locking hole 2411 corresponds to the position of the hexagonal hole when the telescopic rod 32 descends to drive the baffle 34 back to the side away from the sealing ring 52. The second locking hole 2412 corresponds to the position of the hexagonal hole when the telescopic rod 32 drives the baffle 34 to swing to completely cover the sealing ring 52. The locking element 382 is designed as a hexagonal prism structure that fits into the hexagonal hole. The locking element 382 is inserted into the hexagonal hole with a clearance fit. The fit between the hexagonal hole and the hexagonal prism restricts its movement to axial extension and retraction relative to the column 381. The locking element 382 has an enlarged diameter portion 3821 at one end near the second rack 241. A locking pin 3822 is located on the end face of the enlarged diameter portion 3821. A second spring 383 is sleeved on the outside of the locking pin 3822, with its two ends abutting against the end face of the column 381 and the side of the enlarged diameter portion 3821, respectively. The preload of the second spring 383 continuously pushes the locking pin 3822 into the first locking hole 2411 or the second locking hole 2412, reliably locking the second rack 241 and effectively preventing the second rack 241 and the telescopic rod 32 from falling due to gravity. Positioning and locking are achieved through the precise arrangement of double locking holes under different working conditions.

[0057] A blocking plate 384 is fixed to one end of the locking element 382 facing away from the locking pin 3822. A driven pin 385 is fixed to the side of the blocking plate 384 facing the transmission gear 26. Pushing pins 261, which are cylindrical, are fixed to both sides of the end face of the transmission gear 26. The unlocking linkage during forward and reverse rotation is achieved through the design of the pushing pins 261, as detailed below: When the transmission gear 26 rotates in the forward direction, it drives the second rack 241 to move, which in turn moves the telescopic rod 32 toward the box 4. During the process of driving the first slider 31 to rotate in conjunction with the two baffles 34 to block the sealing ring 52, the pushing post 261 located in front of the rotation direction first contacts the driven post 385. By pushing the driven post 385, it drives the locking pin 3822 to move away from the second rack 241, so that the second rack 241 is unlocked and can move smoothly under the drive of the transmission gear 26. Subsequently, the transmission... Gear 26 continues to rotate, driving another push column 261 past the passive column 385 until the baffle 34 rotates to the preset position where it completely covers the sealing ring 52. At this time, the second rack 241 moves to the position where the second locking hole 2412 is coaxially aligned with the hexagonal hole. Under the preload of the second spring 383, the locking pin 3822 quickly inserts into the second locking hole 2412, realizing the reliable locking of the second rack 241 and the telescopic rod 32 after the baffle 34 covers the sealing ring 52, ensuring the stability of the protection state.

[0058] When the transmission gear 26 rotates in the reverse direction, it drives the second rack 241 to move. The linkage telescopic rod 32 moves towards the box 4, driving the first slider 31 to rotate the two baffles 34 to the other side of the valve plate 5 relative to the sealing ring 52. During this process, the push column 261 located in the reverse direction first contacts the passive column 385. By pushing the passive column 385, it drives the locking pin 3822 to move away from the second rack 241, so that the second rack 241 is unlocked and can move smoothly under the drive of the transmission gear 26. Then the transmission gear 26 continues to rotate, driving another push column 261 past the passive column 385 until the baffle 34 rotates to the position where it is completely separated from the sealing ring 52. At this time, the second rack 241 moves to the position where the first locking hole 2411 is coaxially aligned with the hexagonal hole. The locking pin 3822 is inserted into the first locking hole 2411 under the preload of the second spring 383, realizing the stable locking of the second rack 241 and the telescopic rod 32 after the baffle 34 is separated from the sealing ring 52, avoiding accidental displacement in the non-working state.

[0059] Please refer to the appendix. Figure 16 and 17A third guide post 312 is fixed on the first slider 31, and a guide hole 362 is correspondingly provided on the second slider 36. The third guide post 312 is inserted into the guide hole 362 with a clearance fit, so that the linear movement of the second slider 36 can directly drive the first slider 31 to move synchronously. When the telescopic rod 32 moves axially, it drives the second guide post 322 to move synchronously. The second guide post 322, through its cooperation with the second slider 36, drives the second slider 36 to move along the inclined trajectory of the guide groove 501. The axial driving force of the telescopic rod 32 is converted into the lateral driving force of the first slider 31 along the diameter line of the valve plate 5 by utilizing the inclination angle of the guide groove 501, so that the second slider 36 stably pushes the first slider 31 to move, and finally realizes a precise and reliable linkage transmission between the telescopic rod 32 and the first slider 31.

[0060] The telescopic rod 32 can also move in conjunction with the transmission shaft 51, and the first slider 31 can move accordingly, as shown in the attached figure. Figure 9 As shown, this is achieved through the linkage of the third rack 371 and the third gear 372. Specifically, the third rack 371 is fixed to one end of the telescopic rod 32 located within the cavity of the valve plate 5. The rotatable third gear 372 is mounted inside the cavity of the valve plate 5 via a bearing seat. A fourth rack 373 is correspondingly fixed to the first slider 31. The third gear 372 simultaneously forms a stable meshing engagement with both the third rack 371 and the fourth rack 373. When the telescopic rod 32 moves axially, it drives the third rack 371 to move linearly. The third rack 371 drives the third gear 372 to rotate around its own axis through meshing transmission. During the rotation of the third gear 372, it simultaneously meshes with the fourth rack 373, driving the fourth rack 373 and the first slider 31 fixedly connected to it to move along a preset trajectory, ultimately achieving precise and reliable linkage transmission between the telescopic rod 32 and the first slider 31.

[0061] The outer diameter of the valve plate 5 is smaller than the inner diameter of the valve cavity, and the outer diameter of the valve plate 5 is larger than the inner diameter of the retaining ring 11. This size design creates a preset gap between the annular surface of the valve plate 5 and the inner wall of the valve cavity. This gap provides a stable accommodating space for the baffle 34 without interfering with the sealing action of the sealing ring 52 and the retaining ring 11 when the valve plate 5 is closed. (See attached...) Figure 4The two retaining rings 11 are connected at the same end through the filling part 12 to form an integral molding structure. The drive shaft 51 is set to pass through the two filling parts 12 axially. Both ends of the valve plate 5 are provided with relief grooves 503. The relief grooves 503 are sleeved on the outside of the filling part 12 to achieve rotational avoidance. Since the outer diameter of the valve plate 5 is smaller than the inner diameter of the valve cavity, there is a preset gap between the valve plate 5 and the inner wall of the valve cavity. When the valve plate 5 rotates to the valve cavity closed position, the filling part 12 can effectively seal the gap between the valve plate 5 at both ends of the axis of the drive shaft 51 and the inner wall of the valve cavity. This not only ensures the smoothness of the valve plate 5 rotation process, but also improves the overall sealing reliability of the butterfly valve through the gap sealing function of the filling part 12, and prevents fluid from leaking from the gap between the valve plate 5 and the inner wall of the valve cavity.

[0062] In addition, each of the two filling sections 12 has a clearance gap 121 on one side corresponding to the two baffles 34. When the valve plate 5 rotates to the valve chamber opening position, the baffle 34 smoothly passes through the clearance gap 121 of the filling section 12 to achieve the swinging action. Furthermore, in order to optimize the sealing performance, as shown in the attached... Figure 8 and 11 As shown, top plates 531 are fixed to the surfaces of the sealing plate 53 at both ends of the drive shaft 51. Both top plates 531 are connected to sealing plates 54. Specifically, one end of each sealing plate 54 is fixed with two connecting pins 541, which pass through corresponding holes in the top plates 531. A spring is positioned between the top plate 531 and the connecting pins 541, with a first spring 542 sleeved around the connecting pins 541. The elastic preload of the first spring 542 continuously pushes the sealing plate 54 against the outside of the valve plate 5. When the valve plate 5 rotates to abut against the retaining ring 11 to achieve a seal, the sealing plate 54 can completely seal against the clearance gap 121 of the filling part 12, thus sealing the clearance gap 121. As a further preferred embodiment, a rubber gasket can be attached to the side of the sealing plate 54 facing away from the sealing plate 53. The elastic deformation characteristics of the rubber gasket enhance the tightness of the seal between the sealing plate 54 and the clearance gap 121, further improving the overall sealing reliability of the butterfly valve.

[0063] Both sides of the sealing plate 54 near the outer side of the valve plate 5 are provided with inclined guide surfaces 543, which provide precise guidance for the insertion of the baffle 34. When the butterfly valve is opened, after the valve plate 5 is rotated to the point where the valve cavity is fully open, the two baffles 34 move through the clearance gap 121 under the drive of the first slider 31. During the movement, the baffles 34 apply lateral thrust to the guide surfaces 543 of the sealing plate 54, pushing the sealing plate 54 towards the center of the valve plate 5, so that the baffles 34 can smoothly pass through the clearance gap 121 and finally move to the preset position of the sealing ring 52. When the butterfly valve is closed, the two baffles 34 move in opposite directions through the clearance gap 121 under the action of the first slider 31. Similarly, the guide surface 543 of the sealing sheet 54 pushes the sealing sheet 54 towards the center of the valve plate 5, ensuring that the baffles 34 smoothly pass through the clearance gap 121 and return to the side of the valve plate 5 without the sealing ring 52. After the baffles 34 have completely passed the sealing sheet 54, the sealing sheet 54 extends outward from the valve plate 5 and beyond the circumferential surface of the valve plate 5 under the elastic restoring force of the first spring 542. Then, when the valve plate 5 rotates until the sealing ring 52 and the retaining ring 11 are pressed together to seal, the sealing sheet 54 and the clearance gap 121 of the filling part 12 form a precise seal, effectively preventing fluid from seeping through the clearance gap 121. In addition, a rubber gasket can be attached to the side of the sealing sheet 54 facing away from the sealing plate 53. The elastic deformation characteristics of the rubber gasket enhance the tightness of the seal between the sealing sheet 54 and the clearance gap 121, further improving the overall sealing reliability of the butterfly valve.

[0064] With the above structure, the butterfly valve of the present invention operates as follows: In the initial state, the valve plate 5 is in the valve cavity sealing position. The sealing rings 52 on both sides of the valve plate 5 are tightly fitted with the retaining rings 11 on the corresponding side of the valve cavity to achieve sealing. The baffle 34 of the protective mechanism 3 is located on the side of the valve plate 5 where the sealing rings 52 are not provided. The locking pin 3822 of the limiting component is inserted into the first locking hole 2411 of the second rack 241 under the pre-tightening force of the second spring 383, so as to achieve the initial locking of the second rack 241 and the telescopic rod 32. When the butterfly valve is opened, the operator turns the handwheel 21. The handwheel 21 drives the first rotating shaft 211 and the transmission gear 26 fixed on the first rotating shaft 211 to rotate synchronously. The transmission gear 26 first meshes with the second gear 251 on the connecting shaft 25, driving the connecting shaft 25 and the first gear 222 to rotate. The first gear 222 drives the first rack 221 to slide along the slide rail through meshing with the first rack 221. The first rack 221 pulls the second connecting rod 232 through the connecting arm 233. The second connecting rod 232 links the first connecting rod 231 with the pivot point as the fulcrum, thereby driving the transmission shaft 51 and the valve plate 5 fixed on the transmission shaft 51 to rotate to the valve cavity opening position, which is approximately parallel to the valve cavity axis. The transmission gear 26 continues to rotate and disengages from the second gear 251, instead engaging with the second rack 241 on the moving plate 33. This causes the second rack 241 to move linearly along the guide rod 41. The second rack 241 then moves the moving plate 33 synchronously. The moving plate 33 moves relative to the transmission shaft 51 towards the box 4 by driving the telescopic rod 32. The telescopic rod 32 moves in conjunction with the first slider 31. During this process, the first slider 31 transmits power synchronously to the two baffles 34 through the swing rods 35 pivotally connected at both ends. This causes the two baffles 34 to rotate around the axis of the valve plate 5. During rotation, the baffles 34 adhere to the guide surface 543 of the sealing sheet 54, thereby pushing the sealing sheet 54 towards the center of the valve plate 5. This allows the baffles 34 to pass smoothly through the clearance gap 121 of the filling part 12, and then block the sealing ring 52. During the process of opening the butterfly valve, the push post 261 on the end face of the transmission gear 26 first contacts the passive post 385 of the limiting component, pushing the passive post 385 and the locking member 382 to move away from the second rack 241, so that the locking pin 3822 disengages from the first locking hole 2411 to release the initial lock, until the baffle 34 rotates completely to block the sealing ring 52 facing the water inlet end of the valve cavity. At this time, the second locking hole 2412 of the second rack 241 is coaxially aligned with the hexagonal hole of the column 381. The locking pin 3822 is inserted into the second locking hole 2412 under the preload of the second spring 383, realizing the locking of the second rack 241 and the telescopic rod 32. The baffle 34 maintains the blocking and protection state of the sealing ring 52. When closing the butterfly valve, the operator rotates the handwheel 21 in the reverse direction. The handwheel 21 drives the first rotating shaft 211 and the transmission gear 26 to rotate in the reverse direction. The transmission gear 26 first meshes with the second rack 241, and the pushing post 261 at its end face contacts the driven post 385 and pushes the locking member 382 to move, causing the locking pin 3822 to disengage from the second locking hole 2412 and release the lock. The transmission gear 26 continues to drive the second rack 241 to move in the reverse direction. The second rack 241 drives the telescopic rod 32 to move inward toward the valve plate 5 through the moving plate 33. The telescopic rod 32 moves in the reverse direction in conjunction with the first slider 31. The first slider 31 passes through... The rocker arm 35 drives the two baffles 34 to rotate in the opposite direction to the side of the valve plate 5 where the sealing ring 52 is not installed. At this time, the baffle 34 will once again fit the guide surface 543 of the sealing sheet 54 and push the sealing sheet 54 to move until the baffle 34 completely passes through the clearance gap 121 between the sealing sheet 54 and the filling part 12. Under the elastic restoring force of the first spring 542, the sealing sheet 54 extends outward from the valve plate 5. At this time, the first locking hole 2411 of the second rack 241 is coaxially aligned with the hexagonal hole. The locking pin 3822 is inserted into the first locking hole 2411 under the action of the second spring 383 to complete the locking. The transmission gear 26 rotates continuously in the opposite direction with the first rotating shaft 211. After disengaging from the second rack 241, it engages with the second gear 251, driving the connecting shaft 25, the first gear 222, and the first rack 221 to move in the opposite direction. The first rack 221 drives the transmission shaft 51 and the valve plate 5 to rotate in the opposite direction through the second connecting rod 232 and the first connecting rod 231. The sealing rings 52 on both sides of the valve plate 5 are tightly fitted with the corresponding side retaining rings 11. At the same time, the sealing sheet 54 and the clearance gap 121 of the filling part 12 form a sealed fit, completing the closing and sealing of the butterfly valve.

[0065] The above method achieves coordinated operation of valve plate 5 opening / closing and sealing ring 52 protection through handwheel 21. In the initial state, valve plate 5 is sealed by sealing ring 52 and retaining ring 11, and the limiting component locks telescopic rod 32 to prevent accidental displacement. When opening, handwheel 21 drives transmission gear 26 to rotate, first engaging the second gear 251 to drive valve plate 5 to the opening position, suitable for operation in confined spaces; then the gear switches to engage the second rack 241, driving telescopic rod 32 to link with baffle 34. Baffle 34 passes through clearance gap 121 via sealing plate 54 guide surface 543, accurately blocking inlet sealing ring 52 to prevent wear from impurities. At the same time, the limiting component automatically unlocks and relocks after baffle 34 is in position to prevent components from falling. When closing, all components reset in the reverse direction. After baffle 34 disengages, sealing plate 54 automatically seals the gap. Finally, valve plate 5 is pressed and sealed again by sealing ring 52 and retaining ring 11. The overall process sequence is precise, which is not only convenient to operate but also improves the sealing reliability of butterfly valve and the life of sealing ring 52.

[0066] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using the concept of the present invention shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A compact side-mounted butterfly valve, characterized in that, The butterfly valve includes: The valve body has an externally fixed box. Semi-circular retaining rings are provided on both sides of the valve cavity of the valve body, and the two retaining rings are staggered. A valve plate is fixed to a drive shaft. Semi-circular sealing rings are respectively provided on both sides of the valve plate. The two sealing rings are respectively located on both sides of the drive shaft. The valve plate is located in the valve body, and the drive shaft passes through the valve body to the housing body, so that the valve plate is restricted to rotate relative to the valve cavity. When the valve plate rotates to seal the valve cavity, the two sealing rings press against the two retaining rings respectively. An actuator includes a handwheel, a first rack, a first gear, a first connecting rod, and a second connecting rod. One end of the handwheel is fixed to a first rotating shaft, which passes through the side of the valve body into the housing. The first rack slides within the housing, with its sliding direction parallel to the axis of the valve body. The first gear rotates within the housing and meshes with the first rack. The rotation of the first rotating shaft drives the first gear to rotate. One end of the first connecting rod is fixed to the transmission shaft, and both ends of the second connecting rod are pivotally connected to the first rack and the first connecting rod, respectively. When the handwheel is rotated, the first gear drives the first rack to move, the first rack pulls the second connecting rod, and the second connecting rod, in conjunction with the first connecting rod, drives the transmission shaft to rotate, thereby causing the valve plate to rotate.

2. The butterfly valve as described in claim 1, characterized in that, The slider is fixed inside the box, and the sliding direction of the slider is parallel to the axis of the valve body. The slider is adapted to connect to the slide rail. The first rack is fixed to the slide rail. A connecting arm is also fixed to one end of the slide rail. The second connecting rod is pivotally connected to the connecting arm.

3. The butterfly valve as described in claim 1, characterized in that, The butterfly valve also includes a protective mechanism, which comprises a first slider, a drive shaft, a telescopic rod, a movable plate, a baffle, and a swing rod. The first slider is restricted to sliding along a diameter line in the middle of the valve plate; The baffle is an arc-shaped strip with an L-shaped cross-section. The baffle is provided at both the upper and lower ends of the valve plate. The two baffles are restricted to rotate coaxially relative to the valve plate. The baffle is located on the sealing ring side facing the water inlet end of the valve cavity after the valve body is opened. The baffle blocks the annular surface of the valve plate. The swing arm connects the baffle and the first slider, and the two ends of the swing arm are pivotally connected to the baffle and the first slider, respectively. The drive shaft runs through the interior along its axis, one end of the telescopic rod passes through the drive shaft to the interior of the valve plate, and the other end of the telescopic rod is located inside the housing; The movable plate is located inside the box and is restricted to linear movement relative to the valve body. The movable plate and the telescopic rod are axially fixed at one end inside the box. The other end of the movable plate is fixed with a second rack. The first rotating shaft is provided with a transmission gear, and the second rack meshes with the transmission gear. When the handwheel rotates, it drives the transmission gear to rotate, causing the second rack to move and simultaneously drive the telescopic rod to extend out of the valve body. The telescopic rod moves in conjunction with the first slider, causing the first slider to push the swing rod to swing the baffle towards the sealing ring, until the two baffles swing to block the sealing ring facing the water inlet end of the valve body.

4. The butterfly valve as described in claim 3, characterized in that, The protective mechanism also includes a second guide post and a second slider. The second guide post is fixed at one end of the telescopic rod inside the cavity of the valve plate. The second guide post is parallel to the axis of the valve body. The second slider passes through the second guide post with clearance fit. An inclined guide groove is provided on the inner wall of the cavity of the valve plate. A guide pin is provided on one side of the second slider. The guide pin is adapted to slide in the guide groove. When the telescopic rod moves and drives the second guide post to move, the second guide post drives the second slider to move along the guide groove, so that the second slider pushes the first slider to move.

5. The butterfly valve as described in claim 4, characterized in that, The first slider fixes the third guide post, and the second slider is provided with a guide hole. The third guide post passes through the guide hole with a clearance fit, so that the second slider moves and pushes the first slider to move.

6. The butterfly valve as described in claim 3, characterized in that, The telescopic rod is fixed with a third rack inside the cavity of the valve plate. A rotatable third gear is provided inside the cavity of the valve plate. The first slider is fixed with a fourth rack. The third gear meshes with the third rack and the fourth rack. When the telescopic rod moves, it drives the third rack to move, which in turn drives the third gear to rotate. The third gear simultaneously drives the fourth rack to move, causing the first slider to move and push the rocker arm to swing the baffle towards the sealing ring until the two baffles swing to block the sealing ring facing the water inlet end of the valve body.

7. The butterfly valve as described in any one of claims 3 to 6, characterized in that, The protective mechanism further includes a first guide post, two first guide posts are fixed in the cavity of the valve plate, and both first guide posts are parallel to the axis of the valve body. The first slider passes through the two first guide posts with a clearance fit.

8. The butterfly valve according to any one of claims 3 to 6, characterized in that, An opening is formed on one side of the cavity of the valve plate, and a sealing plate is sealed at this opening. Arc-shaped through slots are provided on both sides of the sealing plate, and both through slots are coaxial with the axis of the valve plate. Two connecting rods are fixed to one side of the baffle, and a connecting plate is fixed to the end of the two connecting rods away from the baffle. Both connecting rods are located on the radius line of the baffle, and the connecting rods located on the radius line of the valve plate are connected and fixed to the connecting plate by a limiting pin. The limiting pin is adapted to pass through the through slot.

9. The butterfly valve according to any one of claims 3 to 6, characterized in that, The box is equipped with a rotatable connecting shaft. One end of the connecting shaft is fixed to the first gear, and the other end of the connecting shaft is fixed to the second gear. The transmission gear is a sector gear. When the handwheel is rotated to open the valve plate and drive the transmission gear, the transmission gear first meshes with the second gear, and then the transmission gear meshes with the second rack.

10. The butterfly valve as described in claim 3, characterized in that, The outer diameter of the valve plate is smaller than the inner diameter of the valve cavity, and the outer diameter of the valve plate is larger than the inner diameter of the retaining ring. Both ends of the valve plate are provided with relief grooves. The two retaining rings are integrally formed, and the same end of the two retaining rings is connected to the filling part. The relief groove is rotated around the filling part.

Images