Plug valve with limiting function

Abstract

The invention discloses a plug valve with a limiting function, and relates to the technical field of valves. The bottom cover is mounted at the bottom of the plug valve main body through a bolt; the transmission mechanism is mounted at the top of the plug valve main body, and the transmission mechanism is in transmission connection with an internal component of the plug valve main body; the end cover is mounted at the top of the transmission mechanism; the lifting pipe synchronously rotates along with rotation of the threaded valve rod by rotating the hand wheel, when the lifting pipe rotates by 90 degrees, the positioning pin moves in the vertical groove of the guide groove, the lifting pipe moves downwards, the bottom of the guide block and the inclined contact face synchronously slide, the upper ejector block and the lower ejector block are forced to be matched, and the cock core is expanded and tightly attached to the inner wall of the valve seat. And high sealing performance is maintained. Even if abrasion is generated between the cock core and the inner wall of the valve seat after the cock valve is used for a long time, the cock core can still be tightly attached to the inner wall of the valve seat through the opening effect of the cock core, so that the sealing performance is maintained, and the service life of the cock valve is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, in particular to a plug valve with a position limiting function. Background Art

[0002] In industrial fluid delivery systems, plug valves, as an important control component, are widely used in the fields of petroleum, chemical industry, natural gas, etc. to realize functions such as opening, closing or regulating the flow of fluids in pipelines.

[0003] The core component of a plug valve is the plug core, which achieves a tight seal by tightly fitting against the inner wall of the valve seat. However, over time, the frequent relative movement between the plug core and the inner wall of the valve seat can easily cause wear. This wear increases the sealing gap between the plug core and the inner wall of the valve seat, thereby reducing the valve's sealing performance. Once the sealing performance is reduced, fluid may leak through this gap, affecting the normal function of the valve and potentially causing fluid waste and environmental pollution.

[0004] In addition, insufficient sealing may also cause safety hazards, especially in situations where high-pressure or hazardous fluids are transported. Therefore, how to maintain good sealing between the plug core and the inner wall of the valve seat while extending the service life of the plug valve is a problem that needs to be solved in the existing technology. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a plug valve with a limiting function, which solves the problem mentioned in the background technology that the frequent relative movement between the existing plug core and the inner wall of the valve seat easily causes wear and tear, resulting in easy sealing loss.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A plug valve with a limit function, comprising: Plug valve body; A bottom cover is mounted on the bottom of the plug valve body by bolts and is used to seal the bottom of the plug valve body; A transmission mechanism is mounted on the top of the plug valve body and is in transmission connection with internal components of the plug valve body; an end cover, mounted on the top of the transmission mechanism; The hand wheel is located above the end cover and is used to drive the transmission mechanism, and realizes the opening and closing of the plug valve body by cooperating with the transmission mechanism.

[0007] Preferably, the plug valve body includes a valve seat, docking ports are provided at both ends of the valve seat, a plug core is provided inside the valve seat, and the plug core is provided with two, and the plug core is provided with lower top blocks on the top of the two plug cores, and an upper top block is provided on the top of the plug core, and limiting blocks are provided on both sides of the upper top block and the lower top block, and limiting covers are provided on the top of the upper top block and the bottom of the lower top block, and the limiting covers are fitted with the surface of the valve seat, and a spacer is provided on the surface of the limit cover on the top of the upper top block, and the bottom of the lower top block is connected to the switch nut, and the surface of the switch nut is tightly fitted with the surface of the bottom cover; this design realizes the precise limiting and sealing function of the plug valve through the mutual cooperation of structures such as the valve seat, the plug core, the upper and lower top blocks, the limiting blocks, the limiting covers and the spacer, effectively improving the sealing performance and reliability of the valve, while providing a stable support foundation for the subsequent transmission mechanism connection, ensuring the stability and durability of the plug valve during long-term use.

[0008] Preferably, a rectangular channel is provided between the two said plug cores, the interior of the docking port is in a contraction-shaped structure, one end of the internal channel of the docking port is rectangular, and the other end of the internal channel of the docking port is circular, the internal channel of the docking port is contraction-shaped, the surface of the plug core is tightly fitted with the surface of the valve seat, and a sealing ring is provided on the contact surface between the plug core and the valve seat surface. By providing a rectangular channel between the two plug cores and the contraction-shaped structure inside the docking port and channel ends of different shapes, in combination with the tight fit between the plug core and the valve seat surface and the provision of the sealing ring, the passage path of the fluid can be effectively optimized and the eddy current and resistance of the fluid in the channel can be reduced.

[0009] The top and bottom surfaces of the two plug cores are respectively provided with grooves, and the grooves on the surface of the plug core are tightly fitted with the top of the lower top block and the outer surface of the bottom of the upper top block, the two grooves on the surface of the plug core are spliced ​​together to form a conical groove, and rectangular grooves are provided on both sides of the conical groove to fit the surface of the limit block, and the upper and lower top blocks are both tapered structures; through the tight fit of the grooves on the surface of the plug core and the upper and lower top blocks, and the cooperation of the conical grooves and rectangular grooves formed by the splicing of the two plug core grooves with the limit block, not only a firm connection and precise positioning between the plug core and the top block are achieved, but also stress can be effectively dispersed to ensure that the plug valve can maintain good sealing performance during frequent operation and long-term use. At the same time, the conical upper and lower top block structures further enhance the sealing effect. Even when a gap is generated between the plug core and the inner wall of the valve seat due to wear, the plug core can still maintain a close fit by the expansion effect of the plug core, thereby extending the service life of the plug valve and improving its reliability.

[0010] Preferably, the transmission mechanism includes a housing, which is connected to the valve seat via bolts. A connecting rod is provided within the housing. The bottom end of the connecting rod is integrally formed with the upper block. The top end of the connecting rod is connected to the sleeve via a connecting mechanism. The top of the sleeve is integrally formed with the lifting tube. The lifting tube is internally provided with threads. The lifting tube is threadedly connected to the threaded valve stem via internal threads. The top end of the threaded valve stem is fitted with a handwheel, which is used to drive the threaded valve stem to rotate. The structural layout of the transmission mechanism achieves an efficient transmission connection between the handwheel, the threaded valve stem, the lifting tube, the connecting rod, and the internal components of the plug valve body. The rotation of the handwheel is transmitted to the lifting tube via the threaded valve stem, thereby driving the movement of the connecting rod and the upper block, and ultimately driving the plug core to open and close the valve. This transmission method is not only simple to operate, but also ensures accurate and reliable valve opening and closing.

[0011] Preferably, a guide block is provided on the outside of one end of the top of the threaded valve stem. The guide block and the threaded valve stem are integrally formed. The bottom of the guide block has a sloped structure, which is tightly fitted with the oblique contact surface, and one side of the guide block contacts a vertical contact surface. Both the vertical contact surface and the oblique contact surface are provided on the surface of one end of the top of the lift tube. By providing a guide block with a sloped structure on the top of the threaded valve stem and closely fitting it with the oblique contact surface and vertical contact surface on the top of the lift tube, precise control of the movement state of the lift tube during the rotation of the threaded valve stem is achieved. When the threaded valve stem rotates, the slope of the guide block can push the lift tube to rotate, thereby driving the internal components of the plug valve to close the valve.

[0012] Preferably, the outer wall of the lift tube is provided with a guide groove, which is L-shaped and used to limit the rotation angle of the lift tube to 90 degrees. The surface of the guide groove slides in contact with the outer wall of one end of the positioning pin, and the other end of the positioning pin is threadedly connected to the outer shell. The contact surface of one end of the positioning pin with the outer shell is provided with a one-way tooth groove, which is used to cooperate with the opposite one-way tooth groove on the outer shell surface to prevent the positioning pin from rotating. By providing an L-shaped guide groove on the outer wall of the lift tube, and cooperating with the positioning pin and the one-way tooth groove structure, the rotation angle of the lift tube is precisely limited, ensuring that it can only rotate 90 degrees, thereby accurately controlling the opening and closing state of the plug valve. At the same time, the one-way tooth groove between the positioning pin and the outer shell effectively prevents the positioning pin from rotating, further improving the stability and reliability of the transmission mechanism.

[0013] Preferably, the connecting mechanism includes a slider, a vertical slide groove is provided inside the slider, the slider is slidably connected to one end of the pin through the slide groove, the other end of the pin passes through the first slot and the second slot, the first slot is opened on the surface of the sleeve, and the second slot is opened on the surface of the connecting rod, one end of the top of the slider is threadedly connected to the connecting bolt, one end of the connecting bolt is rotatably connected to the outer wall of the sleeve, and the other end of the connecting bolt is located inside the arc-shaped hole groove on the surface of the shell; through the slider, the pin, the connecting bolt and the slots on the sleeve and the connecting rod in the connecting mechanism, flexible connection of the internal components of the transmission mechanism is achieved, the vertical slide groove inside the slider and the sliding cooperation with the pin, and the pin passing through the slots of the sleeve and the connecting rod, so that the connection between the connecting rod and the sleeve can not only stably transmit power, but also can be easily released by rotating the connecting bolt when needed. This structure not only facilitates the installation and maintenance of the plug valve, but also allows for quick disconnection through tools to achieve emergency opening when the transmission mechanism or handwheel is stuck, greatly improving the reliability and emergency operation capability of the plug valve, while also reducing maintenance costs and time. In addition, a switch angle mark is provided at the bottom of the valve for reference when the switch bolt is turned.

[0014] The present invention provides a plug valve with a position limiting function. It has the following beneficial effects: This plug valve with a limited position function rotates the threaded valve stem by turning the handwheel, which in turn rotates the guide block. Because the lift tube is restricted by the guide groove, when one end of the locating pin is located within the horizontal groove at the bottom of the guide groove, the lift tube cannot move up or down. At this point, the inclined surface at the bottom of the guide block pushes against the oblique contact surface, causing the lift tube to rotate synchronously with the rotation of the threaded valve stem. When the lift tube rotates 90 degrees, the connecting rod drives the upper push block to rotate, and the stop block then switches the plug valve from an open state to a closed state. At this point, the lift tube cannot continue to rotate axially due to the restriction of the guide groove. One end of the locating pin is located at the bottom of the vertical groove of the guide groove, releasing the downward movement restriction on the lift tube. As the threaded valve stem continues to rotate, the locating pin moves within the vertical groove of the guide groove, causing the lift tube to move downward. The bottom of the guide block slides synchronously with the oblique contact surface, forcing the upper push block to cooperate with the lower push block, causing the plug core to expand and fit tightly against the inner wall of the valve seat, maintaining a high sealing performance. Even if wear occurs between the plug core and the inner wall of the valve seat after long-term use, the expansion effect of the plug core can still make it fit tightly with the inner wall of the valve seat, thereby maintaining the sealing and extending the service life of the plug valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the cross-sectional front view structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 5 It is a schematic diagram of the front view structure of the present invention; Figure 6 This is a schematic diagram of the lifting cylinder structure of the present invention; Figure 7 This is a schematic diagram of the threaded valve stem structure of the present invention; Figure 8 This is a schematic diagram of the guide groove structure of the present invention; Figure 9 This is a schematic diagram of the structure of the plug core of the present invention; Figure 10 This is a structural diagram of the slider of the present invention.

[0016] In the figure, 1. plug valve body; 101. valve seat; 102. docking port; 103. plug core; 104. lower top block; 105. upper top block; 106. limit block; 107. switch nut; 108. limit cover; 109. partition plate; 2. bottom cover; 3. transmission mechanism; 301. shell; 302. connecting rod; 303. connecting mechanism; 3031. slider; 3032. latch; 3033. connecting bolt; 3034. first slot; 3035. second slot; 304. sleeve; 305. positioning pin; 306. lifting tube; 307. threaded valve stem; 308. guide block; 309. guide groove; 310. oblique contact surface; 311. vertical contact surface; 4. end cover; 5. handwheel. DETAILED DESCRIPTION

[0017] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] Example 1: Please refer to Figure 1-10 The embodiment of the present invention provides a technical solution: a plug valve with a limit function, comprising: a plug valve body 1; a bottom cover 2, mounted on the bottom of the plug valve body 1 by bolts, for sealing the bottom of the plug valve body 1; a transmission mechanism 3, mounted on the top of the plug valve body 1, and the transmission mechanism 3 is in transmission connection with the internal components of the plug valve body 1; an end cover 4, mounted on the top of the transmission mechanism 3; a handwheel 5, located above the end cover 4, for driving the transmission mechanism 3, and realizing the opening and closing of the plug valve body 1 by cooperating with the transmission mechanism 3; The overall structural design of this stopcock with a position-limiting function ensures that it maintains good sealing performance even after wear and tear during long-term use. The key lies in the transmission connection between the transmission mechanism 3 and the stopcock body 1, as well as the way the handwheel 5 drives the transmission mechanism 3. This design ensures that the internal components of the stopcock body 1 fit tightly together through the precise control of the transmission mechanism 3 when the valve is closed. Even after wear and tear, the structural adjustment and compensation mechanism can maintain the sealing between the stopcock body 1 and the valve seat 101. This effectively solves the problem of seal failure caused by wear and tear, and improves the reliability and service life of the stopcock.

[0019] Example 2: Please refer to Figure 1-10, the embodiment of the present invention provides a technical solution: a plug valve with a limit function, the plug valve body 1 includes a valve seat 101, the valve seat 101 is provided with a docking port 102 at both ends, the valve seat 101 is provided with a plug core 103, the plug core 103 is provided with two, the two plug cores 103 are provided with a lower top block 104 on the top of the two plug cores 103, and the top of the plug core 103 is provided with an upper top block 105, the upper top block 105 and the lower top block 104 are both provided with a limit block 106 on both sides, the top of the upper top block 105 and the bottom of the lower top block 104 are both provided with a limit cover 108, the limit cover 108 is in contact with the surface of the valve seat 101, and the limit cover 108 on the top of the upper top block 105 is provided. The surface is provided with a spacer 109, the bottom of the lower top block 104 is connected to the switch nut 107, and the surface of the switch nut 107 is tightly fitted with the surface of the bottom cover 2; a rectangular channel is provided between the two cock cores 103, and the interior of the docking port 102 is a contraction-shaped structure, one end of the internal channel of the docking port 102 is rectangular, and the other end of the internal channel of the docking port 102 is circular, and the internal channel of the docking port 102 is contraction-shaped, the surface of the cock core 103 is tightly fitted with the surface of the valve seat 101, and a sealing ring is provided on the contact surface between the cock core 103 and the valve seat 101 surface; grooves are provided on the bottom and top surfaces of the cock core 103, and the grooves on the surface of the cock core 103 are respectively connected to the lower The outer surface of the top of the top block 104 and the bottom of the upper top block 105 fit tightly together, and the grooves on the surfaces of the two plug cores 103 are formed into conical grooves by splicing each other, and rectangular grooves are provided on both sides of the conical groove to fit the surface of the limit block 106. The upper top block 105 and the lower top block 104 are both conical structures; the transmission mechanism 3 includes a shell 301, which is connected to the valve seat 101 by bolts, and a connecting rod 302 is provided inside the shell 301. The bottom end of the connecting rod 302 is an integrated structure with the upper top block 105, and the top end of the connecting rod 302 is connected to the sleeve 304 through a connecting mechanism 303, and the top of the sleeve 304 is an elevator tube 306. The lifting tube 306 has a monolithic structure. The lifting tube 306 is provided with a thread inside. The lifting tube 306 is threadedly connected to the threaded valve stem 307 through the internal thread. The top end of the threaded valve stem 307 is mounted on the handwheel 5. The handwheel 5 is used to drive the threaded valve stem 307 to rotate. A guide block 308 is provided on the outside of the top end of the threaded valve stem 307. The guide block 308 and the threaded valve stem 307 are an integrated structure. The bottom of the guide block 308 has a sloped structure. The bottom of the guide block 308 is tightly fitted with the oblique contact surface 310, and one side of the guide block 308 is in contact with the vertical contact surface 311. The vertical contact surface 311 and the oblique contact surface 310 are both provided on the surface of the top end of the lifting tube 306.A guide groove 309 is provided on the outer wall of the lifting tube 306. The guide groove 309 is an L-shaped structure and is used to limit the rotation angle of the lifting tube 306 to 90 degrees. The surface of the guide groove 309 is in sliding contact with the outer wall of one end of the positioning pin 305. The other end of the positioning pin 305 is threadedly connected to the housing 301. The contact surface between the one end of the positioning pin 305 and the housing 301 is provided with a one-way tooth groove, which is used to cooperate with the opposite one-way tooth groove on the surface of the housing 301 to prevent the positioning pin 305 from rotating. In this embodiment, by rotating the handwheel 5, the handwheel 5 can drive the threaded valve stem 307 to rotate. The threaded valve stem 307 can also drive the guide block 308 to rotate. Since the lifting tube is restricted by the guide groove 309, when one end of the positioning pin 305 is located inside the horizontal groove at one end of the bottom of the guide groove 309, the lifting tube 306 is restricted from moving up and down. Then, under the action of the guide block 308, the inclined surface at the bottom of the guide block 308 pushes the inclined contact surface 310, so that the lifting tube 306 rotates synchronously with the rotation of the threaded valve stem 307. When the lifting tube 306 rotates 90 degrees, it drives the upper push block 105 to rotate through the connecting rod 302, so that the upper push block 105 can drive the cock core 103 to rotate 90 degrees through the limit blocks 106 on both sides, switching from the open state to the closed state; Restricted by the guide groove 309, the lifting tube 306 cannot continue to rotate axially after rotating 90 degrees. When the lifting tube 306 rotates 90 degrees and the plug valve is in a closed state, one end of the positioning pin 305 is located at the bottom of the vertical groove of the guide groove 309, thereby releasing the restriction on the downward movement of the lifting tube 306. As the threaded valve stem 307 continues to rotate, the thread allows one end of the positioning pin 305 to move inside the vertical groove of the guide groove 309, thereby allowing the lifting groove to move downward. At the same time, the bottom of the guide block 308 will synchronously slide in contact with the surface of the oblique contact surface 310. When the lifting groove moves downward, it can drive the upper push block 105 to move downward. Through the cooperation of the upper push block 105 and the lower push block 104, the two plug cores 103 can be forced to open, so that the surface of the plug core 103 can fit tightly against the inner wall of the valve seat 101, thereby maintaining a high sealing performance. Even if wear occurs between the plug core 103 and the inner wall of the valve seat 101 after long-term use, the plug core 103 can fit tightly against the inner wall of the valve seat 101 under the action of the two plug cores 103 being stretched outward, thereby maintaining a high sealing performance, greatly extending the service life of the plug valve.

[0020] Example 3: Please refer to Figure 1-10, an embodiment of the present invention provides a technical solution: a plug valve with a limit function, wherein the connecting mechanism 303 includes a slider 3031, a vertical sliding groove is provided inside the slider 3031, the slider 3031 is slidably connected to one end of the latch 3032 through the sliding groove, the other end of the latch 3032 passes through a first slot 3034 and a second slot 3035, the first slot 3034 is provided on the surface of the sleeve 304, and the second slot 3035 is provided on the surface of the connecting rod 302, one end of the top of the slider 3031 is threadedly connected to the connecting bolt 3033, one end of the connecting bolt 3033 is rotatably connected to the outer wall of the sleeve 304, and the other end of the connecting bolt 3033 is located inside the arc-shaped hole groove on the surface of the shell 301; When the cam 303 is in the closed position, the cam 303 is in the closed position, and the cam 303 is in the closed position, so the cam 303 is in the closed position and the cam 303 is in the closed position.

[0021] Working Principle: By turning handwheel 5, handwheel 5 rotates threaded valve stem 307, which in turn rotates guide block 308. Because lift tube 306 is restricted by guide slot 309, when one end of locating pin 305 is located within the horizontal groove at the bottom of guide slot 309, lift tube 306 cannot move up or down. At this point, the inclined surface at the bottom of guide block 308 pushes on inclined contact surface 310, causing lift tube 306 to rotate synchronously with the rotation of threaded valve stem 307. When lift tube 306 rotates 90 degrees, connecting rod 302 drives upper block 105 to rotate, and the stopper 106 then switches the stopcock from open to closed. At this point, lift tube 306 cannot continue to rotate axially due to the restriction of guide slot 309. One end of locating pin 305 is located at the bottom of the vertical groove of guide slot 309, releasing the restriction on downward movement of lift tube 306. As the threaded valve stem 307 continues to rotate, the positioning pin 305 moves within the vertical groove of the guide slot 309, the lifting tube 306 moves downward, and the bottom of the guide block 308 slides synchronously with the oblique contact surface 310, forcing the upper push block 105 to cooperate with the lower push block 104, causing the plug core 103 to expand and fit tightly against the inner wall of the valve seat 101, maintaining a high degree of sealing. Even if wear occurs between the plug core 103 and the inner wall of the valve seat 101 after long-term use, the expansion effect of the plug core 103 can still keep it in close contact with the inner wall of the valve seat 101, thereby maintaining the sealing and extending the service life of the plug valve. When the valve needs to be opened, the hand wheel 5 is rotated in the opposite direction, so that the lifting tube 306 can move upward under the action of the thread until one end of the positioning pin 305 is located at the bottom end of the vertical groove of the guide groove 309, and at the same time, the upper push block 105 is driven to move upward. Then, as the hand wheel 5 continues to rotate, the guide block 308 pushes the vertical contact surface 311, so that the lifting tube 306 can rotate synchronously with the threaded valve stem 307. At the same time, one end of the positioning pin 305 moves to the inside of the horizontal groove at the bottom of the guide groove 309. When the positioning pin 305 moves to the end of the horizontal groove at one end of the bottom of the guide groove 309, the threaded valve stem 307 can no longer move. At this time, the hole grooves inside the two cock cores 103 are aligned with the channels inside the docking port 102, so that the valve is in the open state. Under the limiting action of the guide groove 309, the cock core 103 can be accurately opened and closed; When the valve is in a closed state and the transmission mechanism 3 or the handwheel 5 is stuck due to external factors and cannot be opened normally, the connecting bolt 3033 can be tightened with a tool such as a screwdriver. The rotation of the connecting bolt 3033 will drive the slider 3031 that is threadedly matched with it to move outward, and the slider 3031 will further drive the latch 3032 to move outward, so that the latch 3032 is removed from the slot of the connecting rod 302, thereby releasing the connection between the connecting rod 302 and the sleeve 304. At this time, by rotating the switch nut 107 at the bottom of the end cover 4, the lower top block 104 can be driven to rotate, and the lower top block 104 drives the internal components of the plug valve to rotate through the limit block 106, thereby opening the valve. This emergency opening mechanism ensures that the plug valve can still be opened normally even if the transmission mechanism 3 or the handwheel 5 is stuck, greatly improving the reliability and emergency operation capability of the plug valve.

[0022] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0023] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A plug valve with a limit function, characterized in that: include: Plug valve body (1); A bottom cover (2) is mounted on the bottom of the plug valve body (1) by means of bolts and is used to seal the bottom of the plug valve body (1); A transmission mechanism (3) is mounted on the top of the plug valve body (1), and the transmission mechanism (3) is in transmission connection with internal components of the plug valve body (1); An end cover (4) is mounted on the top of the transmission mechanism (3); The hand wheel (5) is located above the end cover (4) and is used to drive the transmission mechanism (3). By cooperating with the transmission mechanism (3), the plug valve body (1) is turned on and off.

2. A plug valve with a position limiting function according to claim 1, characterized in that: The plug valve body (1) includes a valve seat (101), and docking ports (102) are provided at both ends of the valve seat (101). A plug core (103) is provided inside the valve seat (101), and two plug cores (103) are provided. A lower top block (104) is provided on the top of the two plug cores (103), and an upper top block (105) is provided on the top of the plug core (103). Both sides of the upper top block (105) and the lower top block (104) are provided with A limit block (106) is provided, and a limit cover (108) is provided on the top of the upper top block (105) and the bottom of the lower top block (104). The limit cover (108) is in contact with the surface of the valve seat (101). A spacer (109) is provided on the surface of the limit cover (108) at the top of the upper top block (105). The bottom of the lower top block (104) is connected to the switch nut (107), and the surface of the switch nut (107) is in contact with the surface of the bottom cover (2).

3. A plug valve with a position limiting function according to claim 2, characterized in that: A rectangular channel is provided between the two tap cores (103), the interior of the docking port (102) is in a contraction-shaped structure, one end of the internal channel of the docking port (102) is rectangular, and the other end of the internal channel of the docking port (102) is circular, the internal channel of the docking port (102) is in a contraction-shaped shape, the surface of the tap core (103) is tightly fitted with the surface of the valve seat (101), and a sealing ring is provided on the contact surface between the tap core (103) and the surface of the valve seat (101).

4. A plug valve with a position limiting function according to claim 3, characterized in that: The bottom and top surfaces of the plug core (103) are provided with grooves, and the grooves on the surface of the plug core (103) are closely fitted with the outer surfaces of the top of the lower top block (104) and the bottom of the upper top block (105), respectively. The two grooves on the surface of the plug core (103) are joined together to form a conical groove, and rectangular grooves are provided on both sides of the conical groove to fit with the surface of the limit block (106). The upper top block (105) and the lower top block (104) both have a conical structure.

5. The plug valve with a position limiting function according to claim 4, characterized in that: The transmission mechanism (3) includes a housing (301), the housing (301) is connected to the valve seat (101) by bolts, a connecting rod (302) is provided inside the housing (301), one end of the bottom of the connecting rod (302) is integrated with the upper block (105), one end of the top of the connecting rod (302) is connected to the sleeve (304) through a connecting mechanism (303), the top of the sleeve (304) is integrated with the lifting tube (306), a thread is provided inside the lifting tube (306), the lifting tube (306) is threadedly connected to the threaded valve stem (307) through the internal thread, one end of the top of the threaded valve stem (307) is sleeved on the handwheel (5), and the handwheel (5) is used to drive the threaded valve stem (307) to rotate.

6. The plug valve with a limit function according to claim 5, characterized in that: A guide block (308) is provided on the outer side of one end of the top of the threaded valve stem (307). The guide block (308) and the threaded valve stem (307) are an integrated structure. The bottom of the guide block (308) is in a sloped structure. The bottom of the guide block (308) is tightly fitted with the oblique contact surface (310), and one side of the guide block (308) is in contact with the vertical contact surface (311). The vertical contact surface (311) and the oblique contact surface (310) are both provided on the surface of one end of the top of the lifting tube (306).

7. The plug valve with a position limiting function according to claim 6, characterized in that: The outer wall of the lifting tube (306) is provided with a guide groove (309), and the guide groove (309) is in an L-shaped structure. The guide groove (309) is used to limit the rotation angle of the lifting tube (306) to ninety degrees. The surface of the guide groove (309) is in sliding contact with the outer wall of one end of the positioning pin (305), and the other end of the positioning pin (305) is threadedly connected to the shell (301). The contact surface of one end of the positioning pin (305) and the shell (301) is provided with a one-way tooth groove, which is used to cooperate with the opposite one-way tooth groove on the surface of the shell (301) to prevent the positioning pin (305) from rotating.

8. The plug valve with a position limiting function according to claim 7, characterized in that: The connecting mechanism (303) includes a slider (3031), a vertical sliding groove is provided inside the slider (3031), and the slider (3031) is slidably connected to one end of a latch (3032) through the sliding groove. The other end of the latch (3032) passes through a first slot (3034) and a second slot (3035). The first slot (3034) is provided on the surface of the sleeve (304), and the second slot (3035) is provided on the surface of the connecting rod (302). One end of the top of the slider (3031) is threadedly connected to a connecting bolt (3033), one end of the connecting bolt (3033) is rotatably connected to the outer wall of the sleeve (304), and the other end of the connecting bolt (3033) is located inside an arc-shaped hole groove on the surface of the housing (301).

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