Spring-loaded pressure balance plug valve

Abstract

The invention provides a spring-loaded pressure balance plug valve, and relates to the technical field of plug valves, the spring-loaded pressure balance plug valve comprises a main valve shell, and flange connecting pipes are integrally arranged at the two ends of the main valve shell; a valve body lining is fixedly arranged in the main valve shell, and the valve body lining is of a conical trapezoidal structure with a narrow upper part and a wide lower part; the valve body lining is matched with the inner wall of the main valve shell; a central control shaft matched with the tapered roller bearing is rotationally arranged in the middle of the main valve shell; close fitting and automatic compensation of the core cock and the valve body lining are achieved through the spring loading structure, the threaded push cylinder is matched with the spring below the supporting shaft to adjust the pressure of the core cock on the valve body lining, and the supporting wheel frame and the supporting pulley provide side auxiliary supporting through the spring. The one-way valve can adapt to appearance changes of the core cock caused by machining errors or abrasion, the sealing effect of opening and closing of the valve body is ensured, meanwhile, the one-way valve can balance pressure of an inner cavity of the main valve shell, and normal work of the valve is prevented from being affected by abnormal pressure.

Description

Technical Field

[0001] This invention relates to the field of plug valve technology, and in particular to a spring-loaded pressure-balanced plug valve. Background Technology

[0002] A plug valve is a type of valve that controls the flow of media (liquid, gas, or powder, etc.) in a pipeline by rotating a valve core (usually called a "plug" or "plug"). Its core structure is a cylindrical or conical plug with a through hole, which cooperates with the channel inside the valve body. The valve is opened, closed, or regulated by rotating the plug (usually 90 degrees).

[0003] Currently used plug valves mainly install the valve core by fixing the rotating valve core. This method lacks adaptability, makes it inconvenient to automatically compensate for shape errors to maintain the opening and closing effect of the valve body, lacks a flexible stress adjustment structure, and makes it inconvenient to monitor flow pressure and opening and closing status, as well as to intercept impurities. Summary of the Invention

[0004] In view of the above, the present invention addresses the shortcomings of the prior art by providing a spring-loaded pressure-balanced plug valve.

[0005] This invention provides a spring-loaded pressure-balanced plug valve, specifically comprising: a main valve housing, both ends of which are integrally provided with flange connecting pipes; a valve body liner fixedly disposed inside the main valve housing, the valve body liner having a conical trapezoidal structure that is narrower at the top and wider at the bottom; the valve body liner fitting the inner wall of the main valve housing; a central control shaft rotatably disposed in the middle of the main valve housing in conjunction with a tapered roller bearing; a positioning gear plate integrally disposed at the bottom of the central control shaft, a mating plate integrally disposed at the bottom of the positioning gear plate, and a mating seat integrally disposed at the bottom of the mating plate; and a core plug, the core plug having a conical trapezoidal structure that is narrower at the top and wider at the bottom. The top of the plug has a stopcock slot, and the mating seat can be inserted into the stopcock slot; the bottom of the main valve housing is fixed with a sealing cover by bolts arranged around it; two sets of one-way valves are fixedly installed at the bottom of the sealing cover; a tension line is fixedly installed at the bottom of the tension line with a fixed anchor pile, and a slot matching the fixed anchor pile is opened inside the lower part of the outlet end of the main valve housing, and the fixed anchor pile is fixedly installed in the slot with bolts; a telescopic rod is fixedly installed above the outlet end of the main valve housing, and a through hole is opened at the position of the telescopic rod on the upper part of the main valve housing, with the lower edge of the through hole being arc-shaped, and the top of the tension line is fixed to the inner top of the telescopic rod.

[0006] Optionally, two sets of guide posts are fixedly installed inside the upper part of the main valve housing; each guide post is slidably provided with a hexagonal shaft, and the adjacent ends of the two sets of hexagonal shafts are fitted with springs and fixedly provided with self-locking teeth; the middle of the adjacent surfaces of the two sets of self-locking teeth is an isosceles right-angled triangular convex tooth structure.

[0007] Optionally, the outer periphery of the positioning toothed disc has a toothed structure; four sets of trigger pins are integrally provided on the outer side of the docking disc, the four sets of trigger pins are equidistantly distributed, and adjacent trigger pins are staggered vertically; a handwheel is fixed to the top of the central control shaft by bolts; the handwheel can drive the central control shaft to rotate by rotating, and when the central control shaft rotates, it will drive the positioning toothed disc, docking disc, docking seat and trigger pins to rotate synchronously; the positioning toothed disc and the trigger pins are aligned at positions with deep tooth grooves.

[0008] Optionally, the bottom of the core plug is rotatably supported by a tapered roller bearing, and the support shaft is integrally provided with a flange, the top surface of which is fitted with the tapered roller bearing; a through hole is opened in the middle of the core plug, the through hole is narrower at the top and wider at the bottom than the inlet and outlet ends of the main valve housing, and the through hole can be aligned with the inlet and outlet ends of the main valve housing; a central mesh frame is fitted inside the central through hole of the core plug; the inner walls of the central mesh frame are both sloped structures for guiding flow, and a filter screen is fixedly installed in the middle of the central mesh frame; screw holes are opened in the upper middle of the outer walls on both sides of the central mesh frame, and T-shaped holes are opened in the upper middle of the outer sides of the core plug, the T-shaped holes are aligned with the screw holes on both sides of the central mesh frame, and the central mesh frame and the core plug are fixedly connected by bolts; the core plug fits inside the valve body liner and does not contact the main valve housing.

[0009] Optionally, a threaded push cylinder is provided in the middle of the sealing cover via a threaded connection. The threaded push cylinder has an external threaded cylinder structure. Two sets of levers for assisting hand-tightening are integrally provided at the bottom of the threaded push cylinder. A spring is sleeved below the support shaft and passes through the middle of the threaded push cylinder. Support wheel frames are provided above the positions on both sides of the sealing cover that intersect with the one-way valve. A hexagonal rod is integrally provided at the bottom of each support wheel frame. A spring is sleeved on the hexagonal rod and passes through the sealing cover. Two sets of support pulleys are rotatably provided on the top of each support wheel frame. The top of the support pulleys is in contact with the bottom surface of the core plug.

[0010] Optionally, the one-way valve has an external thread structure on the outside and a hollow structure on the inside. A conical inner valve block is slidably disposed in the middle of the one-way valve, and a spring is disposed between the non-conical end of the inner valve block and the interior of the one-way valve. A flange is integrally disposed on the outside of one end of the one-way valve, and two sets of sharp corner blocks are integrally disposed on the outside of the flange end, with the sharp edges of the two sets of sharp corner blocks adjacent to each other.

[0011] Optionally, two sets of proximity sensors are fixedly installed on the upper side of the inside of the main valve housing, and the trigger stake can trigger the proximity sensors.

[0012] Optionally, a pressure test ball is provided at a position aligned with the middle of the main valve housing outside the tension line. The pressure test ball is a hollow iron ball.

[0013] Optionally, a pressing block is fixedly provided at the telescopic end of the telescopic rod; a pressure sensor is fixedly provided at the top of the outlet end of the main valve housing, and the bottom of the pressing block contacts the pressure sensor.

[0014] Optionally, a display screen is fixedly installed on the outside of the main valve housing, and the pressure sensor and proximity sensor are connected to the display screen via wiring.

[0015] The beneficial effects are as follows: This invention achieves a tight fit and automatic compensation between the core plug and the valve body liner through a spring-loaded structure. The threaded pusher, in conjunction with the spring below the support shaft, can adjust the pressure of the core plug on the valve body liner. The support wheel frame and support pulley provide side auxiliary support through springs, which can adapt to the shape changes of the core plug caused by processing errors or wear, ensuring the sealing effect of the valve body when opening and closing. At the same time, the one-way valve can balance the pressure inside the main valve shell cavity, avoiding abnormal pressure from affecting the normal operation of the valve.

[0016] Equipped with multiple monitoring and feedback functions, it can monitor the valve status and medium pressure in real time. When the trigger pile rotates, it can trigger the proximity sensor and display the valve's fully open or closed status. The pressure test ball pulls the telescopic rod with the medium flow, causing the pressing block to act on the pressure sensor and transmit the medium pressure information to the display screen, making it easy for operators to understand the valve's operation status in a timely manner. The central grid frame can also intercept impurities in the medium and can be easily disassembled and maintained to ensure smooth medium flow.

[0017] The self-locking structure ensures stable valve status, flexible operation, and strong adaptability. The positioning toothed disc and self-locking teeth cooperate with each other, and the spring force is used to achieve self-locking during rotation. Especially when the valve is fully open or fully closed, the deep tooth groove design enhances the self-locking effect. The core plug is connected to the central control shaft through the docking seat. Turning the handwheel can realize opening, closing and status adjustment to adapt to different working conditions. The overall structure takes into account sealing performance, monitoring, and ease of operation. Attached Figure Description

[0018] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the present invention is shown; Figure 2 A three-dimensional disassembly diagram of an embodiment of the present invention is shown; Figure 3 An embodiment of the present invention is shown. Figure 2 Another structural diagram from a different angle; Figure 4 A three-dimensional cross-sectional view of an embodiment of the present invention is shown; Figure 5 A schematic diagram of the half-open state structure of an embodiment of the present invention is shown; Figure 6 An embodiment of the present invention is shown. Figure 4A schematic diagram of the decomposed structure; Figure 7 An embodiment of the present invention is shown. Figure 6 A schematic diagram of the structure viewed from the side; Figure 8 A three-dimensional cross-sectional view of the one-way valve in an embodiment of the present invention is shown; Figure 9 A three-dimensional structural schematic diagram of the central control shaft in an embodiment of the present invention is shown.

[0019] Figure label: 1. Main valve housing; 101. Flange connecting pipe; 102. Valve body liner; 103. Guide post; 104. Self-locking tooth; 2. Central control shaft; 201. Positioning gear plate; 202. Docking plate; 203. Docking seat; 204. Trigger post; 205. Handwheel; 3. Core cock; 301. Cock slot; 302. Support shaft; 303. Central grid frame; 4. Sealing cover; 401. Threaded push cylinder; 402. Support wheel frame; 403. Hexagonal rod; 404. Support pulley; 5. Check valve; 501. Inner valve block; 502. Sharp corner block; 6. Proximity sensor; 7. Tension line; 701. Fixed anchor; 702. Pressure test ball; 8. Telescopic rod; 801. Pressing block; 9. Pressure sensor; 10. Display screen. Detailed Implementation

[0020] To make the objectives, solutions, and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention.

[0021] Example 1: Please refer to the accompanying drawings in the instruction manual. Figures 1 to 9 As shown: This invention proposes a spring-loaded pressure-balanced plug valve, comprising: a main valve housing 1, with flange connecting pipes 101 integrally provided at both ends of the main valve housing 1; a valve body liner 102 fixedly provided inside the main valve housing 1, the valve body liner 102 having a conical trapezoidal structure that is narrower at the top and wider at the bottom; the valve body liner 102 fitting with the inner wall of the main valve housing 1; a central control shaft 2 rotatably mounted in the middle of the main valve housing 1 in conjunction with a tapered roller bearing; a positioning gear disc 201 integrally provided at the bottom of the central control shaft 2, a mating disc 202 integrally provided at the bottom of the positioning gear disc 201, and a mating seat 203 integrally provided at the bottom of the mating disc 202; and a core plug 3, the core plug 3 having a conical trapezoidal structure that is narrower at the top and wider at the bottom. The top of the plug 3 is provided with a stopcock slot 301, and the docking seat 203 can be inserted into the stopcock slot 301. The bottom of the main valve housing 1 is fixed with a sealing cover 4 by a circumferential arrangement of bolts. Two sets of one-way valves 5 are fixedly installed at the bottom of the sealing cover 4. The tension line 7 is fixedly installed with a fixing anchor 701 at its bottom. The bottom of the outlet end of the main valve housing 1 is provided with a slot that matches the fixing anchor 701. The fixing anchor 701 is fixedly installed in the slot by bolts. The top of the outlet end of the main valve housing 1 is fixedly installed with a telescopic rod 8. A through hole is provided at the position of the telescopic rod 8 on the top of the main valve housing 1. The lower edge of the through hole is an arc edge. The top of the tension line 7 is fixed to the top of the inside of the telescopic rod 8.

[0022] Among them, two sets of guide posts 103 are fixedly installed inside the upper part of the main valve housing 1; each guide post 103 is slidably provided with a hexagonal shaft, and the adjacent ends of the two sets of hexagonal shafts are fitted with springs and fixedly provided with self-locking teeth 104; the middle of the adjacent surfaces of the two sets of self-locking teeth 104 are both isosceles right-angled triangular convex tooth structures. The main valve housing 1 serves as the main frame of the entire plug valve, providing space for the installation and protection of internal components. The flange connecting pipes 101 at both ends are used to seal and connect it to the pipeline, ensuring that the medium flows in a closed environment. The internally fixed valve body liner 102 has a tapered trapezoidal structure that is narrow at the top and wide at the bottom, which cooperates with the core plug 3 to achieve a seal and prevent medium leakage. The two sets of guide pins 103 at the top inside provide sliding guidance for the self-locking teeth 104, ensuring its stable movement.

[0023] The positioning gear disc 201 has a toothed outer ring; four sets of trigger pins 204 are integrally installed on the outer side of the mating disc 202, with the four sets of trigger pins 204 evenly distributed and adjacent trigger pins 204 staggered vertically; a handwheel 205 is fixed to the top of the central control shaft 2 by bolts; the positioning gear disc 201 and the trigger pins 204 are aligned with deep tooth grooves; the central control shaft 2 is the control core for valve opening and closing, and the handwheel 205 at the top can rotate to drive the positioning gear disc 201 at the bottom. The docking plate 202, docking seat 203, and trigger post 204 rotate synchronously; the positioning toothed plate 201 has a toothed structure around its outer side, which cooperates with the self-locking tooth 104 to achieve self-locking during rotation. Especially when the valve is fully open or fully closed, the deep tooth grooves that align with the trigger post 204 enhance the self-locking effect; the four sets of trigger posts 204 on the outside of the docking plate 202 can trigger the proximity sensor 6 when rotating, providing feedback on the valve status; the docking seat 203 is inserted into the plug slot 301 of the core plug 3, driving the core plug 3 to rotate synchronously.

[0024] The core plug 3 has a support shaft 302 rotatably mounted on its bottom via a tapered roller bearing. The support shaft 302 has an integrally formed flange, the top surface of which is fitted with the tapered roller bearing. A through hole is formed in the center of the core plug 3, narrower at the top and wider at the bottom than at the inlet / outlet of the main valve housing 1, and aligned with the inlet / outlet of the main valve housing 1. A central mesh frame 303 is fitted within the central through hole of the core plug 3. The inner walls of the central mesh frame 303 have sloping structures on both sides for flow guidance, and a filter screen is fixedly mounted in the center of the central mesh frame 303. Screw holes are formed in the upper middle of both outer walls of the central mesh frame 303, and T-shaped openings are formed in the upper middle of both outer sides of the core plug 3. The T-shaped hole is aligned with the screw holes on both sides of the central grid frame 303, and the central grid frame 303 is fixedly connected to the core plug 3 by bolts; the core plug 3 fits inside the valve body liner 102, and the core plug 3 does not contact the main valve housing 1; the core plug 3 achieves valve opening and closing by rotation; the valve is open when the middle through hole is aligned with the inlet and outlet ends of the main valve housing 1, and closes when it is misaligned after rotation; the bottom support shaft 302, together with the spring and the threaded push cylinder 401, adjusts its pressure on the valve body liner 102 to ensure sealing effect; the central grid frame 303 in the middle through hole is used to intercept impurities in the medium, and the slope structure on both sides of the inner wall plays a guiding role, and can be easily disassembled and maintained by bolts.

[0025] The sealing cover 4 has a threaded push cylinder 401 connected to it in the middle via a threaded connection. The threaded push cylinder 401 has an external threaded cylinder structure. Two sets of levers for assisting hand-tightening are integrally installed at the bottom of the threaded push cylinder 401. A spring is fitted under the support shaft 302 and passes through the middle of the threaded push cylinder 401. Support wheel frames 402 are installed above the positions where the sealing cover 4 intersects with the one-way valve 5 on both sides. A hexagonal rod 403 is integrally installed at the bottom of each support wheel frame 402, and a spring is fitted onto the hexagonal rod 403, which passes through the sealing cover 4. Two sets of support pulleys 404 are rotatably installed on the top of the core plug 3, with the top of the support pulleys 404 fitting against the bottom surface of the core plug 3; the sealing cover 4 is fixed to the bottom of the main valve housing 1 by bolts, providing sealing protection for the internal components; the threaded push cylinder 401 in the middle can adjust the pressure of the spring below the support shaft 302 by rotation, thereby adjusting the position and pressure of the core plug 3; the support wheel brackets 402 on both sides provide side auxiliary support through the hexagonal rod 403 at the bottom and the spring, and the support pulleys 404 at the top fit against the bottom surface of the core plug 3 to adapt to its shape changes.

[0026] The one-way valve 5 has an external threaded structure on the outside and a hollow structure on the inside. A conical inner valve block 501 is slidably installed in the middle of the one-way valve 5. A spring is installed between the non-conical end of the inner valve block 501 and the inside of the one-way valve 5. One end of the one-way valve 5 has an integrally formed flange, and two sets of sharp corner blocks 502 are integrally formed on the outside of the flange end, with the sharp edges of the two sets of sharp corner blocks 502 adjacent to each other. The one-way valve 5 is fixed to the bottom of the sealing cover 4. The external threaded structure facilitates installation. The conical inner valve block 501, in conjunction with the spring, enables one-way flow. The two sets of one-way valves 5 can balance the pressure inside the main valve housing 1 by setting them in opposite directions, avoiding abnormal pressure from affecting the valve operation. The sharp corner blocks 502 at the flange end facilitate positioning and tightening during installation. By inserting a straight screwdriver or other tool between the two sets of sharp corner blocks 502, the one-way valve 5 can be rotated using the sharp corner blocks 502 to achieve disassembly and assembly.

[0027] Two sets of proximity sensors 6 are fixedly installed on the upper side of the inside of the main valve housing 1. The trigger pin 204 can trigger the proximity sensors 6. The proximity sensors 6 are fixed on the upper side of the inside of the main valve housing 1. When the trigger pin 204 rotates and approaches, it is triggered and transmits a signal to the display screen 10 to provide feedback on the valve's fully open or closed status.

[0028] Among them, a pressure test ball 702 is set at the position where the tension line 7 is aligned with the middle of the main valve housing 1. The pressure test ball 702 is a hollow iron ball. The fixed anchor 701 at the bottom of the tension line 7 is fixed inside the water outlet end of the main valve housing 1, and the top is connected to the telescopic rod 8. The pressure test ball 702 connected in the middle pulls the telescopic rod 8 with the flow of the medium to realize the detection of the medium pressure.

[0029] The telescopic rod 8 has a fixed pressing block 801 at its telescopic end. The telescopic rod 8 is fixed above the outlet end of the main valve housing 1 and is pulled and extended by the tension line 7. The pressing block 801 at the telescopic end presses the pressure sensor 9 as it moves, transmitting a pressure signal. The pressure sensor 9 is fixed at the top of the outlet end of the main valve housing 1, and the bottom of the pressing block 801 contacts the pressure sensor 9. The pressure sensor 9 is fixed at the top of the outlet end of the main valve housing 1 and transmits a pressure signal to the display screen 10 after being pressed by the pressing block 801, realizing real-time monitoring of the medium pressure.

[0030] The main valve housing 1 is fixedly equipped with a display screen 10, and the pressure sensor 9 and the proximity sensor 6 are connected to the display screen 10 by wiring. The display screen 10 is fixed to the outside of the main valve housing 1, receives signals from the pressure sensor 9 and the proximity sensor 6, and displays the valve status and medium pressure information in real time, so that the operator can understand the operating status.

[0031] The flange connection pipe 101 is used to seal and connect the main valve housing 1 to the pipeline; The handwheel 205 can rotate to drive the central control shaft 2 to rotate. When the central control shaft 2 rotates, it will drive the positioning gear plate 201, the docking plate 202, the docking seat 203 and the trigger pin 204 to rotate synchronously. During the rotation of the positioning toothed disc 201, the self-locking tooth 104 is kept in contact with the outside of the positioning toothed disc 201 by the adaptation effect of the spring, providing a self-locking effect. The positioning toothed disc 201 and the trigger post 204 are aligned with deep tooth grooves, and the self-locking effect is best when the valve is fully open or fully closed. When the docking seat 203 rotates, it will drive the core plug 3 to rotate synchronously, thereby realizing the opening and closing of the valve, and with the help of the self-locking effect, it can achieve different states of fully open and half open. Core cock 3 is located in Figure 4 When in this state, all valves are open; During the rotation of the trigger pile 204, it can approach the proximity sensor 6 and determine the fully open or closed state of the valve by sending a feedback signal to the display screen 10. The display screen 10 operates using either wired or built-in battery charging. After installing the sealing cap 4, in order to adjust the pressure below the core plug 3 so that it fits against the valve body liner 102, the threaded pusher 401 can be rotated directly. With the help of the spring, the support shaft 302 is pushed upward, which will fit the core plug 3 against the valve body liner 102. Continuing to rotate the threaded pusher 401 can further increase the pressure and achieve spring loading. The support pulley 404, together with the spring outside it, provides side assistance and supports the bottom edge position of the core plug 3. When the core valve 3 rises or falls, it will cause the pressure in the lower cavity inside the main valve housing 1 to change. Since the breathing hole may allow debris such as floating particles to enter, a one-way valve 5 is used to ensure safety. The two sets of one-way valves 5 can pass in opposite directions, thereby naturally adjusting the pressure balance inside the main valve housing 1.

[0032] Example 2: Based on Example 1, during the valve opening and liquid flow process, the central mesh frame 303 can be used to intercept substances, and its mesh size can be customized as needed; Because long-term interception or the interception of large objects can affect flow rate and reduce pressure, pressure testing is required. If abnormal pressure is detected, the central grid 303 can be disassembled for maintenance, cleaning, or replacement.

[0033] Example 3: Based on Example 2, with the core valve 3 fully open, the pressure test ball 702 will be dragged backward along with the flow of the liquid medium and pull the telescopic rod 8 to retract. The contraction force of the telescopic rod 8 will pull the pressing block 801 down, and the pressing block 801 will press the pressure sensor 9 to feedback the pressure, thereby realizing real-time pressure monitoring. like Figure 5 As shown, if the core valve 3 is not fully open, the output liquid level will drop, and the pressure test ball 702 can automatically drop to maintain contact with the flowing liquid for pressure detection.

[0034] The specific usage and function of this embodiment: In this invention, during use, the main valve housing 1 is sealed and connected to the pipeline through the flange connecting pipe 101; When the valve needs to be opened, simply turn the handwheel 205 to drive the central control shaft 2 to rotate. When the central control shaft 2 rotates, the positioning gear plate 201, the docking plate 202, the docking seat 203 and the trigger pin 204 rotate synchronously. During the rotation of the positioning toothed disc 201, the self-locking tooth 104 is kept in contact with the outside of the positioning toothed disc 201 by the adaptation effect of the spring, providing a self-locking effect. Since the positioning toothed disc 201 and the trigger pin 204 are aligned with deep tooth grooves, the self-locking effect is best, especially when the valve is fully open or fully closed. During the rotation of the docking seat 203, the core plug 3 rotates synchronously, thereby achieving opening and closing, and with the help of the self-locking effect, it can open fully and half open. Core cock 3 is located in Figure 4 When in this state, all valves are open; During the rotation of the trigger pile 204, it can approach the proximity sensor 6 and determine the fully open or closed state of the valve by sending a feedback signal to the display screen 10. The display screen 10 operates using either wired or built-in battery charging. During the process of valve opening and liquid flow, the central mesh frame 303 can be used to intercept the liquid. The mesh size of the central mesh frame 303 can be customized as needed to intercept substances. Prolonged interception or the interception of large objects can affect flow rate and reduce pressure, therefore pressure detection is necessary. With the core valve 3 fully open, the pressure test ball 702 moves backward following the flow of the liquid medium, pulling the telescopic rod 8 to retract. The retraction force of the telescopic rod 8 pulls the pressing block 801 down, and the pressing block 801 presses the pressure sensor 9 to provide feedback on the pressure for real-time pressure monitoring. If an abnormal pressure is detected, the central grid frame 303 can be disassembled for maintenance, cleaning, or replacement. After installing the sealing cap 4, the pressure below the core plug 3 needs to be adjusted to make the core plug 3 fit against the valve body liner 102. Directly rotate the threaded push cylinder 401, and with the spring, push the support shaft 302 upward to make the core plug 3 fit against the valve body liner 102. Continuing to rotate the threaded push cylinder 401 can further increase the pressure and achieve spring loading. The support pulley 404, together with the spring outside the support pulley 404, provides a side auxiliary effect to support the bottom edge position of the core plug 3. When the core valve 3 rises or falls, the pressure in the lower cavity inside the main valve housing 1 changes. If an adjustment port is used, debris such as floating particles may enter. Therefore, a check valve 5 is used to ensure safety. The two sets of check valves 5 can pass in opposite directions, thereby naturally adjusting the pressure balance inside the main valve housing 1.

Claims

1. A spring-loaded pressure-balanced plug valve, comprising: The main valve housing (1) has flange connecting pipes (101) integrally installed at both ends; a valve body liner (102) is fixedly installed inside the main valve housing (1), and the valve body liner (102) is a conical trapezoidal structure that is narrower at the top and wider at the bottom; the valve body liner (102) matches the inner wall of the main valve housing (1); a central control shaft (2) is rotatably installed in the middle of the main valve housing (1) in conjunction with a tapered roller bearing; characterized in that a positioning gear plate (201) is integrally installed at the bottom of the central control shaft (2), a docking plate (202) is integrally installed at the bottom of the positioning gear plate (201), and a docking seat (203) is integrally installed at the bottom of the docking plate (202); a core plug (3) has a conical trapezoidal structure that is narrower at the top and wider at the bottom, and the top of the core plug (3) is provided with a... A stopcock slot (301) and a mating seat (203) can be fitted into the stopcock slot (301); a sealing cover (4) is fixedly installed at the bottom of the main valve housing (1) by a circumferential arrangement of bolts; two sets of one-way valves (5) are fixedly installed at the bottom of the sealing cover (4); a tension line (7) is fixedly installed at the bottom of the tension line (7) with a fixed anchor (701); a slot matching the fixed anchor (701) is opened at the bottom of the outlet end of the main valve housing (1); the fixed anchor (701) is fitted into the slot and fixed by bolts; a telescopic rod (8) is fixedly installed above the outlet end of the main valve housing (1); a through hole is opened at the position of the telescopic rod (8) on the top of the main valve housing (1); the lower edge of the through hole is an arc edge; and the top of the tension line (7) is fixed at the top of the inside of the telescopic rod (8).

2. The spring-loaded pressure-balanced plug valve as described in claim 1, characterized in that, Two sets of guide posts (103) are fixedly installed inside the upper part of the main valve housing (1); each guide post (103) has a hexagonal shaft slidably installed in it, and the adjacent ends of the two sets of hexagonal shafts are fitted with springs and fixedly installed with self-locking teeth (104); the middle of the adjacent surfaces of the two sets of self-locking teeth (104) are both isosceles right-angled triangular convex tooth structures.

3. The spring-loaded pressure-balanced plug valve as described in claim 1, characterized in that, The outer periphery of the positioning gear plate (201) is toothed; four sets of trigger pins (204) are integrally provided on the outer periphery of the docking plate (202), the four sets of trigger pins (204) are equidistantly distributed, and adjacent trigger pins (204) are staggered vertically; a handwheel (205) is fixed to the top of the central control shaft (2) by bolts; the positioning gear plate (201) and the trigger pins (204) are aligned with deep tooth grooves.

4. The spring-loaded pressure-balanced plug valve as described in claim 1, characterized in that, The bottom of the core plug (3) is rotatably mounted with a support shaft (302) via a tapered roller bearing. The support shaft (302) is integrally mounted with a flange on its outer surface, and the top surface of the flange is fitted with the tapered roller bearing. A through hole is opened in the middle of the core plug (3). The through hole and the inlet and outlet ends of the main valve housing (1) are both narrow at the top and wide at the bottom, and the through hole and the inlet and outlet ends of the main valve housing (1) can be aligned. A central grid frame (303) is fitted inside the middle through hole of the core plug (3). Both sides of the inner wall of the central grid frame (303) are For the purpose of guiding the flow, a filter screen is fixedly installed in the middle of the central grid frame (303); screw holes are opened in the upper middle of both sides of the outer wall of the central grid frame (303), and T-shaped holes are opened in the upper middle of both sides of the outer core plug (3). The T-shaped holes are aligned with the screw holes on both sides of the central grid frame (303), and the central grid frame (303) and the core plug (3) are fixedly connected by bolts; the core plug (3) fits inside the valve body liner (102), and the core plug (3) does not contact the main valve shell (1).

5. The spring-loaded pressure-balanced plug valve as described in claim 4, characterized in that, A threaded push cylinder (401) is provided in the middle of the sealing cover (4) by a threaded connection. The threaded push cylinder (401) has an external threaded cylinder structure. Two sets of paddles for hand-tightening are integrally provided at the bottom of the threaded push cylinder (401). A spring is sleeved under the support shaft (302) and fits through the middle of the threaded push cylinder (401). Support wheel frames (402) are provided above the positions where the two sides of the sealing cover (4) intersect with the one-way valve (5). A hexagonal rod (403) is integrally provided at the bottom of the support wheel frame (402). A spring is sleeved on the hexagonal rod (403) and passes through the sealing cover (4). Two sets of support pulleys (404) are rotatably provided on the top of the support wheel frame (402). The top of the support pulleys (404) fits the bottom surface of the core plug (3).

6. The spring-loaded pressure-balanced plug valve as described in claim 1, characterized in that, The one-way valve (5) has an external thread structure on the outside and a hollow structure inside. A conical inner valve block (501) is slidably arranged in the middle of the one-way valve (5). A spring is arranged between the non-conical end of the inner valve block (501) and the inside of the one-way valve (5). A flange is integrally provided on the outside of one end of the one-way valve (5). Two sets of sharp corner blocks (502) are integrally provided on the outside of the flange end. The sharp edges of the two sets of sharp corner blocks (502) are adjacent.

7. The spring-loaded pressure-balanced plug valve as described in claim 1, characterized in that, Two sets of proximity sensors (6) are fixedly installed on one side of the upper part of the main valve housing (1), and the trigger post (204) can trigger the proximity sensors (6).

8. The spring-loaded pressure-balanced plug valve as described in claim 1, characterized in that, A pressure test ball (702) is provided at a position where the tension line (7) is aligned with the middle of the main valve housing (1). The pressure test ball (702) is a hollow iron ball.

9. The spring-loaded pressure-balanced plug valve as described in claim 7, characterized in that, The telescopic rod (8) has a pressing block (801) fixedly installed at its telescopic end; a pressure sensor (9) is fixedly installed at the top of the outlet end of the main valve housing (1), and the bottom of the pressing block (801) contacts the pressure sensor (9).

10. The spring-loaded pressure-balanced plug valve as described in claim 9, characterized in that, The main valve housing (1) is fixedly equipped with a display screen (10), and the pressure sensor (9) and proximity sensor (6) are connected to the display screen (10) by wiring.

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