Throttling stop valve

Abstract

The invention discloses a throttling stop valve, and relates to the technical field of valves, the throttling stop valve comprises a valve body, a valve seat, a valve rod, a valve cover, a valve core assembly and a monitoring assembly, the inner side of the valve seat is provided with a guide chute; the valve element assembly comprises a sealing sleeve, a plugging part and an adjusting disc. Circulating grooves are formed in the bottoms of the sealing sleeves; the plugging part is in threaded connection with the bottom of the sealing sleeve cavity; the adjusting disc is hermetically and slidably arranged in the sealing sleeve; the monitoring assembly is fixedly mounted at the top of the valve rod and communicates with an inner cavity of the sealing sleeve; by adjusting the height of the adjusting disc, the valve element assembly can enhance blocking of the valve seat, the sealing performance between the valve element assembly and the valve seat can be detected, and the blocking part can be controlled to be opened. By arranging the components, the purpose of controlling the flow at a low flow speed is effectively achieved, the function of detecting the effectiveness of internal sealing is added, and the purpose of improving the sealing performance is achieved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a throttling shut-off valve. Background Technology

[0002] Throttling valves are key components widely used in fluid control systems, primarily for regulating fluid flow and pressure, as well as for opening and closing pipelines. In fields such as petroleum, chemical, power, and water supply, the performance of throttling valves directly affects the efficiency, safety, and reliability of the system.

[0003] Existing throttling valves typically achieve throttling and sealing through the relative movement between the valve core and the valve seat. For example, in laboratory instruments or medical equipment, where a stable and low-flow-rate fluid output is required, traditional throttling valves perform poorly under low-flow-rate conditions. Due to the simple design of the valve core, it is often impossible to finely adjust minute flow rates, resulting in unsatisfactory throttling effects at low flow rates and problems such as flow fluctuations or inaccurate control.

[0004] Secondly, the sealing performance testing and maintenance of existing throttling valves are quite difficult. The sealing surface between the valve core and seat is prone to wear, aging, or corrosion from the medium after long-term use, leading to sealing failure and leakage. However, conventional valves lack effective online testing methods, usually requiring shutdown and disassembly to check the sealing condition. This not only increases maintenance costs but also affects the continuous operation of the system. Furthermore, even if a sealing problem is detected, traditional valves often cannot quickly adjust the sealing pressure, requiring replacement of components or complete overhaul, which is inefficient.

[0005] Therefore, it is necessary to propose a throttling shut-off valve to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a throttling shut-off valve to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a throttling shut-off valve, comprising: a valve body, a valve stem, a valve cover, and a valve seat with a guide groove on its inner side; further comprising: a valve core assembly, which can control the valve's on / off state and flow rate, enhance the sealing performance between the valve core assembly and the valve seat, and detect the sealing performance between the valve core assembly and the valve seat; the valve core assembly includes a sealing sleeve, wherein its middle and bottom peripheral sidewalls are provided with sealing mating parts that cooperate with the top and bottom of the valve seat, the middle sidewall has a communicating hole, and the bottom has a flow groove, the top has a liquid outlet cover, and the bottom sealing mating part... The side wall is provided with a guide boss that mates with the guide groove; the sealing part is threaded to the bottom of the inner cavity of the sealing sleeve and can seal the flow groove, with a guide hole in the middle and an elastic telescopic component at the top; the adjusting plate is located at the bottom of the valve stem and is slidably sealed in the sealing sleeve, with a limiting protrusion at the bottom, an elastic reset component between the adjusting plate and the sealing part, and a guide groove in the middle; the sealing cover is located at the upper end of the adjusting plate and can seal the guide groove, with a reset component fixedly connected to the liquid outlet cover; the monitoring component is fixedly installed on the top of the valve stem and communicates with the inner cavity of the sealing sleeve.

[0008] Preferably, the guide grooves are evenly distributed in multiple sections along the axis of the valve seat; the guide grooves are divided into a guide section and a vertical section, the guide section is V-shaped and opened on the inner side wall of the valve seat, and the vertical section is located at the bottom point of the guide section and extends along the axis of the valve seat; the guide boss can slide along the guide grooves.

[0009] Preferably, the valve body is divided into an inlet chamber and an outlet chamber, which are respectively connected to the corresponding ends of the valve body; the valve seat is detachably installed in the middle of the valve body, and the inlet chamber and the outlet chamber are connected through the valve seat.

[0010] Preferably, the monitoring component includes: a monitoring part, which is fixedly installed on the upper end of the valve stem for monitoring the pressure inside the sealing sleeve; and a monitoring channel, which passes through the valve stem and is connected at the upper end to the monitoring part and at the lower end to the inner cavity of the sealing sleeve.

[0011] Preferably, the valve core assembly further includes: a sealing boss, which is fixedly connected to the bottom of the sealing part at the position corresponding to the flow groove, and the sealing boss can be inserted into the flow groove to disconnect the liquid inlet chamber from the inner cavity of the sealing sleeve; and an elastic seal, which is placed between the sealing part and the sealing sleeve to enhance the relative sealing between the sealing part and the sealing sleeve.

[0012] Preferably, the elastic telescopic component includes: a guide sleeve, which is fixedly installed in the middle of the sealing part and a plurality of them are evenly arranged along the axis of the sealing part; and elastic pins, which are slidably installed in the corresponding guide sleeves, with a reset elastic element provided between the bottom of the elastic pin and the guide sleeve.

[0013] Preferably, it also includes: a positioning bolt, which is installed between the top of the valve seat and the valve body to prevent the valve seat from rotating relative to the valve body.

[0014] Preferably, it further includes: a handwheel, which is rotatably mounted on the upper end of the valve cover and has a sliding fit with the valve stem on its inner side, for adjusting the height of the valve stem relative to the valve body; and a sealing ring, which is fitted on the outer side of the valve stem and placed inside the valve cover, for improving the sealing performance between the valve cover and the valve stem.

[0015] The technical effects and advantages of this invention are as follows: 1. This invention effectively achieves low-flow-rate flow control by setting a sealing sleeve, adjusting plate, plugging part, elastic pin, and limiting protrusion. In use, the adjustment plate is lowered and rotated synchronously by rotating the valve stem. When the limiting protrusion contacts the elastic pin, the adjusting plate pushes the plugging part to rotate synchronously. Since the thread direction on the outside of the plugging part is opposite to the thread direction of the valve stem, the plugging part rotates and moves upward synchronously when the adjusting plate rotates downward. At this time, the medium in the inlet chamber enters the sealing sleeve through the flow groove, and enters the outlet chamber through the guide groove and the outlet hole. The liquid flow rate is controlled by rotating the valve stem to control the height of the plugging part relative to the flow groove, and the current height of the adjusting plate is judged by the scale line on the outside of the valve stem. This makes the gate valve suitable for low-flow-rate working conditions and increases the applicability of the gate valve.

[0016] 2. This invention, by incorporating a sealing sleeve, adjusting disc, monitoring unit, and monitoring channel, enhances the function of detecting the effectiveness of the internal seal. During operation, the adjusting disc is slid upwards via the valve stem. This reduces the pressure in the chamber below the adjusting disc within the sealing sleeve. The internal pressure is then transmitted through the monitoring channel to the monitoring unit, allowing for direct observation of the pressure change within the sealing sleeve. If the monitoring unit detects a pressure decrease after the adjusting disc slides upwards, the surface seal is effective; conversely, if no pressure decrease is detected, the seal is ineffective. Furthermore, if the pressure gradually recovers after a decrease while the adjusting disc remains in its position, this also indicates a seal failure. By monitoring the valve's sealing performance online, the purpose of detecting seal effectiveness without shutting down the machine is effectively achieved.

[0017] 3. By setting a valve seat, sealing sleeve, adjusting plate, sealing part and elastic reset member, the present invention effectively achieves the purpose of improving sealing performance. During use, the elastic reset member is deformed under pressure as the adjusting plate slides downward. The sealing part increases the pressure between the sealing sleeve and the valve seat, making the pressure of the sealing mating part relative to the corresponding position of the valve seat greater, thereby improving the relative sealing between the valve seat and the sealing sleeve.

[0018] 4. By setting up a monitoring unit and a monitoring channel, this invention effectively realizes the function of detecting the internal pressure of the valve. When in use, the valve is opened and the sealing sleeve slides out completely from the valve seat, so that the inlet chamber and the outlet chamber are connected. The internal pressure of the valve body enters the monitoring unit through the monitoring channel, so as to realize the real-time monitoring of the liquid pressure in the valve core and improve the controllability and safety of the system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the valve body in this invention.

[0021] Figure 3 This is a schematic diagram of the sealing effectiveness detection status of the present invention.

[0022] Figure 4 This is a schematic diagram of the initial state of the valve core assembly in this invention.

[0023] Figure 5 This is a schematic diagram of the valve in the low flow rate state of the present invention.

[0024] Figure 6 This is a schematic diagram of the valve body disassembly in this invention.

[0025] Figure 7 This is a schematic diagram of the internal structure of the sealing sleeve in this invention.

[0026] Figure 8 This is a schematic diagram of the unfolded state of the guide groove in this invention.

[0027] In the diagram: 1. Valve body; 2. Valve seat; 5. Valve stem; 4. Valve cover; 3. Guide groove; 301. Guide section; 302. Vertical section; 6. Valve core assembly; 601. Sealing sleeve; 602. Sealing mating part; 603. Connecting hole; 604. Flow groove; 605. Guide boss; 606. Liquid outlet cover; 607. Liquid outlet hole; 608. Sealing part; 609. Guide hole; 610. Elastic reset element; 611. Adjusting plate; 612. 613. Limiting protrusion; 6134. Elastic telescopic component; 6135. Guide sleeve; 6136. Elastic pin; 6137. Reset elastic component; 618. Sealing boss; 619. Elastic seal; 610. Flow guide groove; 611. Sealing cover; 611. Reset component; 702. Monitoring component; 703. Monitoring section; 704. Monitoring channel; 105. Liquid inlet chamber; 106. Liquid outlet chamber; 107. Positioning bolt; 18. Handwheel; 19. Sealing ring. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This invention provides, for example Figures 1 to 8 The throttling valve shown includes: a valve body 1, which is installed in the middle of a pipeline. The inner side of the valve body 1 is divided into an inlet chamber 101 and an outlet chamber 102, which are respectively connected to corresponding ends of the valve body 1. The inlet chamber 101 and the outlet chamber 102 are respectively connected to the pipeline through flange connection or threaded connection. The pipeline is controlled by controlling the connection state of the inlet chamber 101 and the outlet chamber 102; a valve seat 2 with a guide groove 3 on its inner side, which is threadedly installed in the middle of the valve body 1. The inlet chamber 101 and the outlet chamber 102 are connected through the inner hole of the valve seat 2. A positioning bolt 15 is installed between the top of the valve seat 2 and the valve body 1. The valve seat 2 is used to prevent loosening caused by rotation relative to the valve body 1 after installation. The threaded connection not only facilitates the disassembly and maintenance of the valve seat 2, but also improves the sealing performance between the valve seat 2 and the valve body 1 through the thread preload, thus preventing media leakage. The valve cover 4 is fixedly installed on the upper end of the valve body 1 to seal the valve body 1. A sealing groove can be set on the inner side of the valve cover 4 and a sealing gasket can be embedded. The valve cover 4 seals the upper opening of the valve body 1 to prevent external impurities from entering the inner cavity of the valve body 1, and at the same time prevents the medium inside the valve body 1 from leaking outward, thus ensuring the safety of equipment operation. The valve stem 5 is threaded in the middle of the valve cover 4. The height of the valve stem 5 relative to the valve cover 4 can be adjusted by rotation.

[0030] Specifically, it also includes: valve core assembly 6, which is located at the bottom of valve stem 5 and can be placed inside valve seat 2. It can control the valve opening and closing and flow rate, enhance the sealing between valve core assembly 6 and valve seat 2, and also detect the sealing between valve core assembly 6 and valve seat 2.

[0031] The valve core assembly 6 includes a sealing sleeve 601, which is coaxial with the valve seat 2 and can be placed inside the valve seat 2 to prevent the inlet chamber 101 from communicating with the outlet chamber 102. The sealing sleeve 601 can slide up and down relative to the valve seat 2. The outer wall of the sealing sleeve 601 is tightly fitted with the inner wall of the valve seat 2. The surface sealing structure blocks the flow of medium between the inlet chamber 101 and the outlet chamber 102, thereby achieving the shut-off function.

[0032] More specifically, the middle and bottom peripheral walls of the sealing sleeve 601 are provided with sealing mating parts 602 that cooperate with the top and bottom of the valve seat 2. The sealing mating parts 602 fit with the valve seat 2 so that the inlet chamber 101 and the outlet chamber 102 are not connected. The sealing mating parts 602 can be coated with a wear-resistant coating to enhance sealing and wear resistance. When the sealing sleeve 601 fits with the valve seat 2, the sealing mating parts 602 and the inner wall of the valve seat 2 form a sealing structure, and the seal is achieved by the pressure of the inclined surface fitting.

[0033] The middle sidewall of the sealing sleeve 601 has multiple connecting holes 603, which are evenly distributed along the axis of the sealing sleeve 601. The middle outer wall of the sealing sleeve 601 has a preset gap relative to the middle inner wall of the valve seat 2.

[0034] The bottom of the sealing sleeve 601 is provided with a flow groove 604, so that the liquid inlet chamber 101 is connected to the inside of the sealing sleeve 601 through the flow groove 604, so that the medium in the liquid inlet chamber 101 can enter the inside of the sealing sleeve 601 through the flow groove 604, providing a medium channel for the subsequent throttling structure.

[0035] The top of the sealing sleeve 601 is detachably connected to the liquid outlet cover 606, which is fitted on the outside of the valve stem 5. The liquid outlet cover 606 is connected to the sealing sleeve 601 by bolts. The middle part of the liquid outlet cover 606 has multiple liquid outlet holes 607 that communicate with the liquid outlet chamber 102. The liquid outlet holes 607 are evenly distributed along the circumference and are used to guide the fluid to the liquid outlet chamber 102.

[0036] The sealing part 608 is threadedly installed at the bottom of the inner cavity of the sealing sleeve 601 and can block the flow groove 604. A guide hole 609 is opened in the middle of the sealing part 608, and multiple holes are evenly distributed along the axis of the sealing part 608 to connect the inner side of the sealing sleeve 601 with the flow groove 604. An elastic telescopic member 613 is provided on the top of the sealing part 608.

[0037] An adjusting disc 611 is located at the bottom of the valve stem 5 and is slidably and sealingly disposed within the sealing sleeve 601. The valve stem 5 drives the adjusting disc 611 to move synchronously axially within the sealing sleeve 601. The movement of the adjusting disc 611 can adjust the valve core assembly 6, realizing the switching between throttling and shut-off states. A limiting protrusion 612 is provided at the bottom of the adjusting disc 611. An elastic reset member 610 is provided between the adjusting disc 611 and the sealing part 608. The elastic reset member 610 is a component such as an elastic telescopic column that can achieve self-reset after elastic deformation. By adjusting the position of the sealing part 608, the inlet chamber 101 and the outlet chamber 102 can be connected for throttling under low flow conditions. Multiple guide grooves 616 are opened in the middle of the adjusting disc 611, and multiple guide grooves 616 are evenly distributed along the axis of the adjusting disc 611.

[0038] The sealing cover 617 is located at the upper end of the adjusting plate 611 and can block the guide groove 616. A reset component 618 is fixedly connected between the sealing cover 617 and the liquid outlet cover 606. The reset component 618 can be a spring or other component that can achieve self-reset after elastic deformation.

[0039] During the valve closing process, rotating the valve stem 5 clockwise causes the adjusting disc 611 to push the sealing sleeve 601 into the valve seat 2. When the adjusting sealing sleeve 601 is placed in the valve seat 2, the sealing sleeve 601 disconnects the inlet chamber 101 from the outlet chamber 102, and the valve is closed. When it is necessary to open the valve, rotating the valve stem 5 counterclockwise causes the adjusting disc 611 to drive the sealing sleeve 601 to slide upward, completely removing the sealing sleeve 601 from the valve seat 2. At this time, the inlet chamber 101 and the outlet chamber 102 are connected through the through hole in the middle of the valve seat 2.

[0040] It should be noted that the elastic force of the elastic reset member 610 is greater than the thrust of the medium in the inlet chamber 101 that pushes the sealing sleeve 601. Therefore, when the elastic reset member 610 is not compressed, the sealing sleeve 601 can be pushed into the valve seat 2, thereby achieving relative disconnection between the inlet chamber 101 and the outlet chamber 102.

[0041] Specifically, it also includes: a monitoring component 7, which is fixedly installed on the top of the valve stem 5 and communicates with the inner cavity of the sealing sleeve 601. The monitoring component 7 includes: a monitoring part 702, which is fixedly installed on the upper end of the valve stem 5 and is used to monitor the pressure inside the sealing sleeve 601. The monitoring part 702 can be a pressure sensor or a pressure gauge, which is fixedly installed on the upper end of the valve stem 5 by threaded connection or snap-fit; and a monitoring channel 701, which passes through the valve stem 5 and communicates with the monitoring part 702 at its upper end and with the sealing sleeve 601 at its lower end. During operation, since the sealing sleeve 601 is connected to the monitoring part 702, the monitoring part 702 can display the pressure value in real time. The operator can judge whether the sealing performance is effective based on the pressure change and can monitor the liquid pressure in the inlet chamber 101. When the valve is turned on, the liquid pressure inside the valve body 1 can be observed through the monitoring part 702.

[0042] When it is necessary to open the valve and maintain a low flow rate, turn the valve stem 5 clockwise. The adjusting plate 611 slides downward and rotates synchronously under the influence of the valve stem 5. When the adjusting plate 611 slides downward, the reset member 618 extends to keep the sealing cover 617 in contact with the adjusting plate 611. At this time, the sealing cover 617 no longer blocks the guide groove 616. When the reset member 618 extends to its maximum length, as the adjusting plate 611 continues to descend, the sealing cover 617 no longer contacts the adjusting plate 611. During this process, the elastic reset member 610 is compressed. When the adjusting plate 611 drives the sealing part 608 to rotate synchronously, the sealing part 608 slides upward to allow the medium in the inlet chamber 101 to flow into the sealing sleeve 601 through the flow groove 604. Then, it enters the upper part of the adjusting plate 611 through the guide groove 616 and then enters the outlet chamber 102 through the outlet hole 607. At this time, the flow rate is controlled by continuing to rotate the valve stem 5.

[0043] It should be noted that the medium channel opened by the upward sliding of the plug 608 is much smaller than the channel opened by the sealing sleeve 601 moving out of the valve seat 2. Therefore, the medium flow rate is lower, making it suitable for low-flow scenarios. It should also be noted that the thread direction of the plug 608 is opposite to that of the valve stem 5. When the adjusting disc 611 drives the plug 608 to rotate synchronously, the plug 608 and the adjusting disc 611 slide towards each other. The valve stem 5 is marked with scale lines on its outer side, which are located on the outer side of the valve cover 4. The operator can use the scale lines to determine the height of the valve stem 5 relative to the valve seat 2, and also to determine the descent height of the adjusting disc 611.

[0044] It should be noted that before testing the effectiveness of the seal, the adjusting disc 611 should first be slid downwards via the valve stem 5 to allow the lower part of the medium to be discharged through the guide groove 616. Then, the adjusting disc 611 should be slid upwards, and the pressure change inside the sealing sleeve 601 should be observed through the monitoring unit 702. If the pressure inside the sealing sleeve 601 decreases, it indicates that the sealing sleeve 601 and the valve seat 2 are in an effective sealing state, and the sealing part 608 and the sealing sleeve 601 are also in an effective sealing state. If the pressure does not decrease or the pressure recovers after the adjusting disc 611 is stopped from moving upwards, it indicates that the internal seal is ineffective and there is a leak.

[0045] Specifically, it also includes: a sealing boss 614, which is fixedly connected to the bottom of the sealing part 608 at the position corresponding to the flow groove 604. The sealing boss 614 can be inserted into the flow groove 604, so that the liquid inlet chamber 101 is disconnected from the inner side of the sealing sleeve 601. The sealing part 608 drives the sealing boss 614 to move downward to block the flow groove 604. In order to improve the sealing performance, the periphery of the sealing boss 614 is inclined. The flow groove 604 is adapted to the sealing boss 614; an elastic sealing element 615, which is placed between the sealing part 608 and the sealing sleeve 601 to enhance the relative sealing between the sealing part 608 and the sealing sleeve 601. The elastic sealing element 615 can be an O-ring or a rubber gasket, which is placed between the contact surfaces of the sealing part 608 and the sealing sleeve 601 to enhance the sealing effect.

[0046] When in use, the sealing part 608 slides upward, and the sealing boss 614 slides out from the flow groove 604. At this time, the medium in the liquid inlet chamber 101 enters the lower end of the sealing part 608 through the flow groove 604, and enters the sealing sleeve 601 through the guide hole 609. Then, the liquid enters the upper part of the adjusting plate 611 through the guide groove 616, and then enters the liquid outlet chamber 102 through the liquid outlet hole 607. At this time, the liquid flow rate is controlled by controlling the height of the sealing part 608 relative to the flow groove 604. When the sealing part 608 slides upward, the distance between the sealing boss 614 and the bottom of the sealing sleeve 601 increases, and the gap between the sealing boss 614 and the flow groove 604 increases, thus increasing the flow rate. Conversely, when the sealing part 608 slides downward, the flow rate decreases.

[0047] More specifically, the elastic telescopic component 613 includes: a guide sleeve 6131, which is fixedly installed in the middle of the sealing part 608, and multiple guide sleeves 6131 are evenly arranged along the axis of the sealing part 608. The guide sleeves 6131 and the sealing part 608 can be fixedly installed by threaded connection or welding, etc.; and elastic pins 6132, which are slidably installed in the corresponding guide sleeves 6131. ​​The inner diameter of the guide sleeve 6131 and the outer diameter of the elastic pin 6132 are clearance-fitted to ensure that the elastic pin 6132 can slide along the guide sleeve 6131. ​​A reset elastic element 6133 is provided between the bottom of the elastic pin 6132 and the guide sleeve 6131. ​​The reset elastic element 6133 can be a miniature spring or elastic rubber. When the elastic pin 6132 is subjected to external force, it slides axially along the guide sleeve 6131 and compresses the reset elastic element 6133. After the external force disappears, the reset elastic element 6133 releases its elastic potential energy to push the elastic pin 6132 upward to reset. The two ends of the reset elastic element 6133 are fixedly connected to the guide sleeve 6131 and the elastic pin 6132 respectively to prevent the elastic pin 6132 from coming out of the guide sleeve 6131. ​​The limiting protrusion 612 is fixedly connected to the lower end of the adjusting plate 611. It can push the sealing part 608 to rotate synchronously through the elastic pin 6132 and the guide sleeve 6131. ​​The end face of the limiting protrusion 612 is provided with an arc-shaped transition surface.

[0048] When the adjusting disc 611 rotates upward, it drives the limiting protrusion 612 to rotate synchronously. The limiting protrusion 612 presses against the elastic pin 6132 through the arc-shaped transition surface. Under the action of the guide sleeve 6131, the elastic pin 6132 slides downward. As the adjusting disc 611 continues to rotate, the limiting protrusion 612 passes over the elastic pin 6132. Subsequently, the reset elastic element 6133 pushes the elastic pin 6132 to reset upward. As the adjusting disc 611 continues to rotate, the limiting protrusion 612 pushes the side wall of the elastic pin 6132, causing the sealing part 608 to move synchronously. The step rotation and the arc transition surface can reduce the friction and wear between the limiting protrusion 612 and the elastic pin 6132. The evenly distributed limiting protrusion 612 can make the sealing part 608 bear the force evenly and avoid the deformation of the sealing part 608. When the low flow rate is closed, the valve stem 5 is rotated counterclockwise. The adjusting plate 611 slides the sealing part 608 downward through the limiting protrusion 612. When the limiting protrusion 612 separates from the elastic pin 6132, the sealing part 608 presses the elastic sealing element 615 and makes the sealing part 608 and the sealing sleeve 601 relatively sealed.

[0049] It should be noted that when the valve stem 5 drives the adjusting disc 611 to slide upward, the pressure inside the sealing sleeve 601 decreases, indicating that the sealing sleeve 601 and the valve seat 2 are in an effective sealing state, and the plug 608 and the sealing sleeve 601 are also in an effective sealing state. If the pressure does not decrease or the pressure recovers after the adjusting disc 611 stops moving upward, it indicates that the internal seal is ineffective and there is a leakage.

[0050] It should be noted that when the limiting protrusion 612 slides downward, the elastic reset element 610 increases the pressure between the valve seat 2 and the sealing sleeve 601. At this time, the limiting protrusion 612 does not contact the elastic pin 6132. By actively increasing the pressure between the valve seat 2 and the sealing sleeve 601, the sealing performance of the valve core is improved. When the monitoring component 7 detects a failure in the internal sealing performance, the above method can be used to try to restore the sealing performance of the valve core, ensuring that the shut-off valve can work temporarily. After stopping work, the shut-off valve can be inspected and repaired to reduce downtime.

[0051] Specifically, the guide groove 3 is divided into a guide section 301 and a vertical section 302. The guide section 301 is V-shaped and opened on the inner side wall of the valve seat 2. The vertical section 302 is located at the bottom of the guide section 301 and extends along the axis of the valve seat 2. The guide boss 605 is fixedly installed on the outside of the sealing sleeve 601 and can slide along the guide groove 3. The guide boss 605 corresponds to the guide groove 3 one by one.

[0052] It should be noted that when closing the valve, rotating the valve stem 5 clockwise causes the valve stem 5 to push the sealing sleeve 601 downwards, and the sealing sleeve 601 can rotate freely relative to the valve stem 5. When the guide boss 605 contacts the guide section 301, the sealing sleeve 601 rotates relative to the valve seat 2 due to the pressure of the inclined surface of the guide section 301. As the valve stem 5 continues to descend, the guide boss 605 enters the vertical section 302. At this time, the sealing sleeve 601 no longer rotates. When the guide boss 605 slides to the end of the vertical section 302, the valve is completely closed. Then, continuing to rotate the valve stem 5 clockwise will open the low flow mode.

[0053] More specifically, it also includes: a handwheel 16, which is rotatably mounted on the upper end of the valve cover 4 and slides with the valve stem 5 on its inner side, used to adjust the height of the valve stem 5 relative to the valve body 1. During operation, the operator rotates the handwheel 16, which drives the valve stem 5 to rotate and causes the valve stem 5 to slide up and down through the valve cover 4. The axial movement of the valve stem 5 drives the adjusting disc 611 to rise and fall synchronously, thereby adjusting the relative position of the sealing sleeve 601 and the valve seat 2, realizing the opening and closing or throttling regulation of the throttling shut-off valve; and a sealing ring 17, which is fitted on the outside of the valve stem 5 and placed inside the valve cover 4, used to improve the sealing performance between the valve cover 4 and the valve stem 5.

[0054] In summary, when in use, the valve body 1 is installed in the middle of the pipeline, and the inlet chamber 101 is connected to the upstream pipeline, and the outlet chamber 102 is connected to the downstream pipeline. When the valve is opened, the valve stem 5 is rotated counterclockwise by the handwheel 16. The sealing sleeve 601 is pushed upward by the adjusting plate 611 through the reset piece 618 and the outlet cover 606, so that the sealing sleeve 601 is completely removed from the valve seat 2. At this time, the inlet chamber 101 and the outlet chamber 102 are connected through the through hole in the middle of the valve seat 2.

[0055] When the valve is closed, the valve stem 5 is rotated clockwise to push the sealing sleeve 601 into the valve seat 2 via the adjusting plate 611. At the same time, the elastic reset member 610 places the sealing part 608 at the bottom of the sealing sleeve 601. The valve stem 5 descends to allow the guide boss 605 to enter the vertical section 302. When the guide boss 605 slides to the end of the vertical section 302, the inlet chamber 101 and the outlet chamber 102 are disconnected and the valve is completely closed.

[0056] When it is necessary to test the sealing effectiveness of the valve, firstly, the valve stem 5 is moved downward, causing the adjusting plate 611 to move downward synchronously, reducing the volume at its lower end. At this time, the internal medium will push the sealing cover 617 upward through the guide groove 616, creating a gap between the sealing cover 617 and the adjusting plate 611. The medium is discharged through this gap. Before the adjusting plate 611 moves downward and the limiting protrusion 612 contacts the elastic pin 6132, the adjusting plate 611 is slid upward. If the pressure inside the sealing sleeve 601 decreases when the valve stem 5 drives the adjusting plate 611 to slide upward, it indicates that the sealing sleeve 601 and the valve seat 2 are in an effective sealing state, and the sealing part 608 and the sealing sleeve 601 are also in an effective sealing state. If the pressure does not decrease or the pressure recovers after the adjusting plate 611 stops moving upward, it indicates that the internal seal is ineffective and there is a leakage.

[0057] When a low flow rate is required, the valve stem 5 is rotated clockwise. The adjusting plate 611 slides downward and rotates synchronously under the influence of the valve stem 5. The limiting protrusion 612 pushes the side wall of the elastic pin 6132, causing the sealing part 608 to rotate synchronously. The sealing part 608 slides upward, allowing the medium in the inlet chamber 101 to flow into the outlet chamber 102 through the flow channel 604. Then, it enters the upper part of the adjusting plate 611 through the connecting hole 603, and then enters the outlet chamber 102 through the outlet hole 607. At this time, the flow rate is controlled by continuing to rotate the valve stem 5.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A throttling shut-off valve, comprising a valve body (1), a valve stem (5), a valve cover (4), and a valve seat (2) with a guide groove (3) on its inner side, characterized in that, It also includes: valve core assembly (6), which can control the valve opening and closing and flow rate, can enhance the sealing between valve core assembly (6) and valve seat (2), and can detect the sealing between valve core assembly (6) and valve seat (2); The valve core assembly (6) includes a sealing sleeve (601), with a sealing mating part (602) on the middle and bottom peripheral sidewalls that cooperates with the top and bottom of the valve seat (2). The middle sidewall has a connecting hole (603) and a flow groove (604) on the bottom. The top of the sleeve has a liquid outlet cover (606), and the bottom sealing mating part (602) sidewall has a guide boss (605) that cooperates with the guide slide groove (3). The sealing part (608) is threaded to the bottom of the inner cavity of the sealing sleeve (601) and can block the flow groove (604). A guide hole (609) is provided in the middle and an elastic telescopic member (613) is provided at the top. The adjusting plate (611) is located at the bottom of the valve stem (5) and is slidably disposed in the sealing sleeve (601). A limiting protrusion (612) is provided at the bottom. An elastic reset member (610) is provided between the adjusting plate (611) and the sealing part (608), and a guide groove (616) is provided in the middle. A sealing cap (617) is located at the upper end of the adjusting plate (611) and can block the guide groove (616). A reset member (618) is fixedly connected between the sealing cap (606) and the liquid outlet cap (606). The monitoring component (7) is fixedly mounted on the top of the valve stem (5) and communicates with the inner cavity of the sealing sleeve (601).

2. A throttling shut-off valve according to claim 1, characterized in that, The guide groove (3) has multiple grooves evenly distributed along the axis of the valve seat (2); The guide groove (3) is divided into a guide section (301) and a vertical section (302). The guide section (301) is V-shaped and opened on the inner side wall of the valve seat (2). The vertical section (302) is located at the bottom of the guide section (301) and extends along the axis of the valve seat (2). The guide boss (605) can slide along the guide groove (3).

3. A throttling shut-off valve according to claim 1, characterized in that, The inner side of the valve body (1) is divided into an inlet chamber (101) and an outlet chamber (102), and the inlet chamber (101) and the outlet chamber (102) are respectively connected to the corresponding ends of the valve body (1); The valve seat (2) is detachably installed in the middle of the valve body (1), and the inlet chamber (101) and the outlet chamber (102) are connected through the valve seat (2).

4. A throttling shut-off valve according to claim 1, characterized in that, The monitoring component (7) includes: The monitoring unit (702) is fixedly installed at the upper end of the valve stem (5) and is used to monitor the pressure inside the sealing sleeve (601); The monitoring channel (701) passes through the valve stem (5), and its upper end is connected to the monitoring part (702), while its lower end is connected to the inner cavity of the sealing sleeve (601).

5. A throttling shut-off valve according to claim 1, characterized in that, The valve core assembly (6) also includes: The sealing boss (614) is fixedly connected to the bottom of the sealing part (608) at the position corresponding to the flow groove (604). The sealing boss (614) can be inserted into the flow groove (604) to disconnect the liquid inlet chamber (101) from the inner cavity of the sealing sleeve (601). An elastic seal (615) is placed between the plug (608) and the sealing sleeve (601) to enhance the relative sealing between the plug (608) and the sealing sleeve (601).

6. A throttling shut-off valve according to claim 1, characterized in that, The elastic telescopic member (613) includes: Guide sleeves (6131) are fixedly installed in the middle of the sealing part (608), and multiple guide sleeves are evenly arranged along the axis of the sealing part (608); The elastic pins (6132) are slidably installed in the corresponding guide sleeves (6131), and a reset elastic element (6133) is provided between the bottom of the elastic pin (6132) and the guide sleeve (6131).

7. A throttling shut-off valve according to claim 1, characterized in that, Also includes: The positioning bolt (15) is installed between the top of the valve seat (2) and the valve body (1) to prevent the valve seat (2) from rotating relative to the valve body (1).

8. A throttling shut-off valve according to claim 1, characterized in that, Also includes: The handwheel (16) is rotatably mounted on the upper end of the valve cover (4) and its inner side is slidably engaged with the valve stem (5) to adjust the height of the valve stem (5) relative to the valve body (1); A sealing ring (17) is fitted on the outside of the valve stem (5) and placed inside the valve cover (4) to improve the sealing performance between the valve cover (4) and the valve stem (5).

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