A throttle stop vent valve

Abstract

The application discloses a throttling cut-off vent valve and relates to the technical field of valves, which comprises a valve body, an inlet flow channel, an outlet flow channel, a valve core, a valve cover and a control assembly, the valve core is used for controlling the on-off of the inlet flow channel and the outlet flow channel, the valve core comprises a guide sleeve, a closing sleeve and an adjusting sleeve, the output flow of the valve body is adjusted by controlling the adjusting sleeve to slide relative to the closing sleeve through the control assembly, and throttling is controlled; the pressure in the inlet flow channel is rapidly vented by making the closing sleeve slide relative to the guide sleeve; and the inlet flow channel is depressurized by making the adjusting sleeve slide relative to the control assembly. The above components are arranged, the purpose of rapid venting is effectively achieved, and the function of automatic pressure relief is increased.

Description

Technical Field

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

[0002] In petrochemical, natural gas transmission, and high-pressure pipeline systems, throttle valves, gate valves, and vent valves are core components ensuring the safe operation of the system. Traditional valve designs are often complex to operate, especially in high-pressure, multi-condition scenarios where technical bottlenecks exist. Although traditional throttle valves can regulate flow through valve core opening, their structural design cannot achieve rapid venting. In emergency situations, a separate vent valve must be relied upon, which results in a delayed response and occupies space.

[0003] A spring-loaded multi-stage throttling vent valve, as described in application number CN202311748693.8, includes: a valve body, a valve cover, an end cover, a valve stem, a valve seat, a valve sleeve, a valve core, and a throttling sleeve. Within the valve body, the valve seat, the throttling sleeve, the valve core, and the valve sleeve are sequentially installed from bottom to top. The outer circumferential surface of the valve seat is provided with a plurality of first throttling holes. The outer circumferential surface of the valve sleeve near its lower side is provided with a plurality of second throttling holes. The outer circumferential surface of the throttling sleeve in the middle is provided with a third throttling hole. A multi-stage sealing structure exists between the valve seat and the valve core, and this multi-stage sealing structure is used to seal the fluid passage from the first throttling holes to the second throttling holes.

[0004] The above technical solution has some problems in use. When the vent valve is in use, it cannot automatically release pressure when the equipment is under high pressure. High pressure can cause damage to the equipment and the vent valve. In addition, it cannot release pressure quickly in emergency situations, which affects the safety of equipment operation.

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

[0006] The purpose of this invention is to provide a throttling and shut-off vent 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 and shut-off venting valve, comprising: a valve body having an inlet channel and an outlet channel inside; a valve core detachably disposed in the middle of the valve body for controlling the opening and closing of the inlet channel and the outlet channel; a valve cover detachably mounted on the top of the valve body for sealing the valve body; a control component disposed at the upper end of the valve core, penetrating the valve cover in the middle and sealingly cooperating with the valve cover for adjusting the state of the valve core; the valve core includes a guide sleeve threadedly mounted in the middle of the valve body and connecting the inlet channel and the outlet channel; a sealing sleeve movably fitted inside the guide sleeve; an adjusting sleeve placed in the outlet channel and sealingly fitted outside the sealing sleeve; the output flow of the valve body is adjusted by the control component by adjusting the sliding of the adjusting sleeve relative to the sealing sleeve to control throttling; when the sealing sleeve slides relative to the guide sleeve, the pressure in the inlet channel is quickly released; the sliding of the adjusting sleeve relative to the control component can depressurize the inlet channel.

[0008] Preferably, the valve core further includes: a fixed sleeve, the upper end of which is detachably installed at the bottom of the valve cover, and a plurality of pressure relief grooves are evenly opened in the circumference, so that its outer side is connected to the outlet channel; the adjusting sleeve is movably fitted inside the fixed sleeve; a throttling groove is opened in the circumference of the adjusting sleeve and is connected to the pressure relief groove; an output groove is opened in the circumference of the closed sleeve and its inner side is connected to the inlet channel; the output flow of the vent valve is adjusted by controlling the overlap area of ​​the throttling groove and the output groove.

[0009] Preferably, the valve core further includes: a drive rod, the upper end of which is fixedly connected to the control component and a plurality of guide protrusions are fixedly connected circumferentially; a guide collar, which is sealed on the outside of the drive rod and detachably connected to the valve cover; and a pressure elastic element, which is placed between the adjusting sleeve and the guide collar for adjusting the pressure relief threshold.

[0010] Preferably, the valve core further includes a guide groove, which is formed in the middle of the adjusting sleeve, and each guide protrusion groove is placed in the corresponding guide groove and can slide along the guide groove.

[0011] Preferably, the control component includes: an adjusting screw, which is threaded into the middle of the valve cover and whose lower end is fixedly connected to the drive rod, for controlling the position of the adjusting sleeve; a pressure relief rod, which passes through the middle of the adjusting screw and the drive rod and is movably sealed with the adjusting screw and the drive rod, and whose lower end is fixedly connected to the upper end of the sealing sleeve; and an upper pull elastic element, which is fitted onto the end of the pressure relief rod and whose upper and lower ends are fixedly connected to the pressure relief rod and the adjusting screw, respectively.

[0012] Preferably, a pressure relief groove is provided on the inner side of the guide sleeve; a guide slider is detachably installed on the outer side of the closed sleeve, and its end is placed in the pressure relief groove and can slide along it.

[0013] Preferably, the output slot is Z-shaped, and its width gradually increases from bottom to top.

[0014] The technical effects and advantages of this invention are as follows:

[0015] 1. This invention effectively achieves rapid venting by setting up control components, guide sleeves, pressure relief grooves, and adjustment sleeves. In use, the pressure relief rod is pulled upward to place the guide slider in the rotating section. Then, the pressure relief rod is rotated and released. Subsequently, the elastic element is pulled upward to make the guide slider slide quickly to the end of the pressure relief section, so that the output groove, throttling groove and pressure relief groove correspond, completing the rapid venting operation. This avoids equipment or venting valve failure caused by prolonged high pressure and achieves the purpose of rapid venting in emergency situations.

[0016] 2. This invention effectively enhances the automatic pressure relief function by incorporating a sealing sleeve, adjusting sleeve, drive rod, guide protrusion, guide ring, pressing elastic element, and guide groove. During use, the control component prevents the bottom of the guide slider from contacting the guide groove. Subsequently, influenced by the pressure within the inlet channel, the adjusting sleeve slides relative to the sealing sleeve, causing the throttling groove and output groove to overlap, reducing the pressure within the inlet channel. Then, the pressing elastic element pushes the adjusting sleeve downwards to reset, completing the pressure relief operation within the inlet channel. This prevents damage to the equipment and vent valve due to excessive pressure and extends the service life of the vent valve.

[0017] 3. This invention effectively optimizes the throttling function by setting a pressure relief groove, a throttling groove, and an output groove. During use, the entire sleeve slides upward, and the position of the sleeve relative to the closed sleeve is controlled and adjusted so that the throttling groove and the output groove overlap. By controlling the overlapping area, the output flow of the valve body is limited. The width of the output groove gradually increases from bottom to top, so that the vent valve can be used in equipment with larger flow requirements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a cross-sectional view of the valve body in this invention.

[0020] Figure 3 This is a schematic diagram of the valve core and its disassembly in this invention.

[0021] Figure 4 This is a disassembly diagram of the valve core and control components in this invention.

[0022] Figure 5 This is a schematic diagram showing the positional relationship between the valve core and the control component in this invention.

[0023] Figure 6 This is a schematic diagram of the valve core structure in this invention.

[0024] Figure 7This is a cross-sectional view of the valve cover in this invention.

[0025] Figure 8 In this invention Figure 2 A magnified view of a portion of region A.

[0026] Figure 9 This is a schematic diagram showing the unfolding of the guide sleeve in this invention.

[0027] In the diagram: 1. Valve body; 2. Inlet channel; 3. Outlet channel; 4. Valve core; 5. Valve cover; 6. Control assembly; 401. Guide sleeve; 402. Sealing sleeve; 403. Adjusting sleeve; 404. Fixing sleeve; 405. Pressure relief groove; 406. Throttling groove; 407. Output groove; 408. Drive rod; 409. Guide protrusion; 410. Guide collar; 411. Downward elastic element; 412. Guide slide groove; 4121. End cap; 413. Pressure relief slide groove; 4131. Fixed section; 4132. Rotating section; 4133. Pressure relief section; 414. Guide slider; 601. Adjusting screw; 602. Pressure relief rod; 603. Upward elastic element. 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 9 The diagram shows a throttling and shut-off venting valve, comprising a valve body 1 with an inlet channel 2 and an outlet channel 3 inside. Connecting flanges are provided at positions corresponding to the inlet and outlet channels 2 and 3, allowing the valve body 1 to be bolted to the desired location. A valve core 4 is detachably disposed in the middle of the valve body 1, used to control the opening and closing of the inlet and outlet channels 2 and 3. The bottom of the valve core 4 is positioned between the inlet and outlet channels 2 and is sealed to prevent uncontrolled communication between them. A valve cover 5 is detachably mounted on the top of the valve body 1, used to seal the valve body 1. The valve cover 5 is mounted to the top of the valve body 1 via flanges and bolts, with a sealing ring between them to prevent leakage. A control component 6 is disposed above the valve core 4, penetrating the middle of the valve cover 5 and sealingly engaging with it. This component is used to adjust the state of the valve core 4. The control component 6 and the valve core 4 cooperate to control the conduction state of the valve body 1.

[0030] Specifically, the valve core 4 includes a guide sleeve 401, which is threadedly installed in the middle of the valve body 1 and connects the inlet channel 2 and the outlet channel 3. A sealing ring is installed at the top of the guide sleeve 401, which seals the outside after installation. A closing sleeve 402 is movably fitted inside the guide sleeve 401. The upper end of the closing sleeve 402 is hollow. An output groove 407 is formed around the circumference of the closing sleeve 402 and its inner side communicates with the inlet channel 2. Multiple output grooves 407 are provided and evenly distributed at the upper part of the closing sleeve 402. An adjusting sleeve 403 is placed inside the outlet channel 3 and seals the movable sleeve. The upper end of the inner side of the adjusting sleeve 403 is connected to the inlet channel 2, which is installed on the outside of the closed sleeve 402. The pressure in the inlet channel 2 can push the adjusting sleeve 403 to move. The throttling groove 406 is opened in the circumference of the adjusting sleeve 403 and is connected to the pressure relief groove 405. Multiple grooves are provided and evenly distributed in the lower part of the adjusting sleeve 403. The fixed sleeve 404 is detachably installed at the bottom of the valve cover 5 by means of screws or bolts, and multiple pressure relief grooves 405 are evenly opened in the circumference, so that its outer side is connected to the outlet channel 3. The adjusting sleeve 403 is movably fitted inside the fixed sleeve 404.

[0031] It should be noted that the output flow rate of valve body 1 is adjusted by controlling the sliding adjustment sleeve 403 relative to the closed sleeve 402 through the control component 6, thereby controlling the throttling. The larger the overlap area between the throttling groove 406 and the output groove 407, the larger the flow rate through valve core 4, and vice versa. The output flow rate of the vent valve is adjusted by controlling the overlap area between the throttling groove 406 and the output groove 407. The pressure in the inlet channel 2 is quickly released by adjusting the sliding of the closed sleeve 402 relative to the guide sleeve 401 through the control component 6. During this process, the closed sleeve 402 descends rapidly, so that the output groove 407 and the throttling groove 406 are highly overlapped. At this time, valve body 1 is at its maximum output, which controls the flow rate in the inlet channel 2. The pressure is released quickly. At the same time, the adjusting conduit can be manually controlled to reach the upper limit position by adjusting the component, so that the output groove 407 and the throttling groove 406 are highly overlapped, which can also be used for rapid pressure relief. However, the closing sleeve 402 moves faster by controlling it, which is suitable for emergency pressure relief. The adjusting sleeve 403 slides relative to the control component 6 to relieve pressure in the inlet channel 2. When the downward pressure of the adjusting sleeve 403 on the control component 6 is small, the pressure in the inlet channel 2 increases, which can push the adjusting sleeve 403 to slide upward, so that the throttling groove 406 and the output groove 407 overlap by a part. At this time, the pressure in the inlet channel 2 decreases, achieving the purpose of pressure relief and avoiding the impact of high pressure on the equipment and valve body 1.

[0032] It should be noted that the output channel 407 is Z-shaped and its width gradually increases from bottom to top, which makes the flow rate through the output channel 407 greater at the same height, so that the vent valve can be used for equipment with larger flow requirements without affecting the control during throttling.

[0033] Specifically, the valve core 4 also includes: a drive rod 408, the upper end of which is fixedly connected to the control component 6, and multiple guide protrusions 409 are fixedly connected circumferentially. The drive rod 408 can slide relative to the adjusting sleeve 403 by one end, which is the maximum range of motion of the adjusting sleeve 403 when depressurizing; a guide ring 410, which is sealed on the outside of the drive rod 408 and detachably connected to the valve cover 5. The guide ring 410 is installed on the inside of the valve cover 5 by screws, which facilitates the disassembly and maintenance of the device; and a downward elastic element 411, which is placed between the adjusting sleeve 403 and the guide ring 410 and is used to adjust the depressurization threshold. The downward elastic element 411 can be a spring or other elastic component that can provide downward thrust. When the adjusting sleeve 403 slides upward under the influence of the pressure in the inlet channel 2, the downward elastic element 411 is used to push the adjusting sleeve 403 downward to reset. By installing downward elastic elements 411 with different elastic coefficients, the function of depressurizing at different pressure values ​​can be realized.

[0034] More specifically, the valve core 4 also includes a guide groove 412, which is opened in the middle of the adjusting sleeve 403. Each guide protrusion 409 is placed in the corresponding guide groove 412 and can slide along the guide groove 412. For easy assembly, the upper end of the adjusting sleeve 403 is fitted with an end cap 4121 by screws. During assembly, after the guide slider 414 is installed in the guide groove 412, the end cap 4121 is fitted downwards at the end of the drive rod 408 and installed on the top of the adjusting sleeve 403 by screws. At this time, the guide protrusion 409 cannot slide out of the guide groove 412.

[0035] It should be noted that the length of the guide groove 412 determines the distance that the adjusting sleeve 403 can move during pressure relief, thus limiting the maximum flow rate of the valve body 1 during pressure relief. During use, when the guide protrusion 409 is placed at the bottom of the guide groove 412, the drive rod 408 provides pressure to the adjusting sleeve 403. At this time, the pressure in the inlet channel 2 cannot push the adjusting sleeve 403 to slide upward to relieve pressure, and the valve body 1 is in a completely closed state. When the guide slider 414 is placed in the middle of the guide groove 412, the distance between the bottom of the guide protrusion 409 and the bottom of the guide groove 412 is the maximum range of movement of the adjusting sleeve 403 for pressure relief. When the guide protrusion 409 is placed at the top of the guide groove 412, the guide protrusion 409 can pull the adjusting sleeve 403 upward, thereby controlling the position of the adjusting sleeve 403 relative to the closing sleeve 402, so that the throttling groove 406 overlaps with the output groove 407. By controlling the overlapping area, the output flow rate of the valve body 1 is limited.

[0036] Specifically, the control component 6 includes: an adjusting screw 601, which is threaded into the middle of the valve cover 5 and its lower end is fixedly connected to the drive rod 408, used to control the position of the adjusting sleeve 403. For ease of operation, a handwheel is fixedly connected to the upper end of the adjusting screw 601. In use, the adjusting screw 601 is rotated relative to the valve cover 5 by controlling the handwheel, thereby controlling the position of the adjusting sleeve 403 relative to the guide sleeve 401; and a pressure relief rod 602, which passes through the middle of the adjusting screw 601 and the drive rod 408, and is in close contact with the adjusting screw 601 and / or the drive rod 408. The lower end of the pressure relief rod 602 is fixedly connected to the upper end of the sealing sleeve 402. For ease of operation, an operating plate is fixedly installed on the upper end of the pressure relief rod 602. The upper elastic element 603 is fitted onto the end of the pressure relief rod 602, and its upper and lower ends are fixedly connected to the pressure relief rod 602 and the adjusting screw tube 601, respectively. The upper elastic element 603 can be a tension spring or other elastic component that can provide tension. The two ends of the upper elastic element 603 can be fixed to the pressure relief rod 602 and the adjusting screw tube 601 by screws or other fixing methods. The specific installation method is not further limited here.

[0037] It should be noted that when in use, the control plate can be pulled upward and rotated to one side, and then the control plate can be released. Pulling up the elastic element 603 will pull the pressure relief rod 602 to slide downward quickly. At this time, the sealing sleeve 402 slides downward quickly, so that the output groove 407, the throttling groove 406 and the pressure relief groove 405 correspond to each other, and the rapid venting operation is completed.

[0038] More specifically, the inner side of the guide sleeve 401 is provided with a pressure relief groove 413, which is divided into a fixed section 4131, a rotating section 4132, and a pressure relief section 4133. The fixed section 4131, the rotating section 4132, and the pressure relief section 4133 are connected in sequence. The outer side of the sealing sleeve 402 is detachably equipped with a guide slider 414, and its end is placed in the pressure relief groove 413 and can slide along it. The guide slider 414 is installed on the side wall of the sealing sleeve 402 by threads, and one end is provided with an internal hexagon for easy installation. During assembly, the sealing sleeve 402 is inserted into the guide sleeve 401 and the guide slider 414 is installed by the internal hexagon to connect them.

[0039] It should be noted that during pressure relief, throttling, and normal venting operations, the guide slider 414 is placed in the fixed section 4131. At this time, the sealing sleeve 402 is fixed in position relative to the guide sleeve 401, and the guide slider 414 is also placed in the fixed section 4131 when the venting valve is assembled. When venting rapidly, the pressure relief rod 602 is pulled upward to place the guide slider 414 in the rotating section 4132. Then, the pressure relief rod 602 is rotated to allow the guide slider 414 to enter the pressure relief section 4133. After releasing the pressure relief rod 602, the elastic element 603 is pulled upward to allow the guide slider 414 to slide rapidly to the end of the pressure relief section 4133, so that the venting valve can quickly release the pressure in the inlet channel 2.

[0040] In summary, the valve core 4 is inserted into the valve body 1, and the valve core 4 is rotated so that the guide sleeve 401 is threaded into the valve body 1. Then, the valve cover 5 is connected to the valve body 1 by bolts to complete the assembly of the vent valve. During the assembly process, different elastic elements 411 with different elastic coefficients are selected according to the maximum pressure value that the equipment connected to the inlet channel 2 can withstand. Then, the two ends of the vent valve are connected to the corresponding positions by bolts and flanges.

[0041] When it is necessary to completely close the vent valve, rotate the adjusting screw 601 to make the drive rod 408 slide downward, and at the same time, the guide protrusion 409 is placed at the lower end of the guide groove 412. At this time, the throttling groove 406 and the output groove 407 do not overlap, the vent valve is completely closed, and the inlet channel 2 and the outlet channel 3 are disconnected.

[0042] When it is necessary to avoid damage to the equipment connected to the inlet channel 2 and the vent valve due to excessive pressure, rotate the adjusting screw 601 to separate the guide protrusion 409 from the bottom of the guide groove 412. The adjusting sleeve 403 slides upward under the influence of the pressure in the inlet channel 2, so that the throttling groove 406 overlaps with the output groove 407, connecting the inlet channel 2 and the outlet channel 3 to release the pressure. The pressing elastic element 411 pushes the adjusting sleeve 403 to slide downward and reset, so that the throttling groove 406 separates from the output groove 407. At this time, the inlet channel 2 and the outlet channel 3 are disconnected. When the pressure in the inlet channel 2 rises again, it will push the adjusting sleeve 403 to move again.

[0043] When it is necessary to control the output flow of the vent valve to achieve the purpose of throttling, rotate the adjusting screw 601 to make the guide protrusion 409 contact the top of the guide groove 412, and continue to rotate, so that the adjusting sleeve 403 can slide upward, control the position of the adjusting sleeve 403 relative to the closing sleeve 402, so that the throttling groove 406 overlaps with the output groove 407, and limit the output flow of the valve body 1 by controlling the overlapping area; when it is necessary to adjust to the maximum flow to complete the venting, rotate the adjusting screw 601 to make the adjusting sleeve 403 reach the upper limit position, and make the overlapping area of ​​the throttling groove 406 and the output groove 407 reach the maximum, at which time the inlet channel 2 is vented.

[0044] When high pressure occurs and rapid pressure relief and venting are required, pull the pressure relief rod 602 upward to place the guide slider 414 into the rotating section 4132. Then, after rotation, release the pressure relief rod 602 to allow the guide slider 414 to enter the pressure relief section 4133. The upward-pulling elastic element 603 causes the guide slider 414 to slide quickly to the end of the pressure relief section 4133, so that the pressure relief groove 405, the throttling groove 406 and the output groove 407 correspond, allowing the venting valve to quickly release the pressure in the inlet channel 2, avoiding the problem of long time required to manually adjust to the maximum discharge flow rate.

[0045] 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 and shut-off vent valve, characterized in that, include: The valve body has an inlet channel and an outlet channel inside. The valve core, which is detachably located in the middle of the valve body, is used to control the opening and closing of the inlet and outlet channels; A valve cover, which is detachably mounted on top of the valve body, is used to seal the valve body; The control component is located at the upper end of the valve core, passes through the valve cover in the middle, and is sealed with the valve cover to adjust the state of the valve core. The valve core includes a guide sleeve, which is threadedly installed in the middle of the valve body and connects the inlet channel and the outlet channel; The closed sleeve, whose movable part is fitted inside the guide sleeve; Adjust the sleeve so that it is placed inside the outlet channel and the sealing movable sleeve is placed on the outside of the closed sleeve; The output flow of the valve body is adjusted by regulating the sliding of the adjusting sleeve relative to the closed sleeve, thereby controlling the throttling; when the closed sleeve slides relative to the guide sleeve, the pressure in the inlet channel is quickly released. Adjusting the sliding energy of the sleeve relative to the control components can relieve pressure in the inlet channel; The valve core further includes: a fixed sleeve, the upper end of which is detachably installed at the bottom of the valve cover, and multiple pressure relief grooves are evenly opened in the circumference so that its outer side is connected to the outlet channel; the adjusting sleeve is movably fitted inside the fixed sleeve. A throttling groove is formed in the circumference of the adjusting sleeve and is connected to the pressure relief groove; The output slot is located circumferentially in the closed sleeve and its inner side is connected to the inlet channel. The output flow rate of the vent valve is adjusted by controlling the overlap area between the throttling groove and the output groove. The valve core also includes: a drive rod, the upper end of which is fixedly connected to the control component, and multiple guide protrusions are fixedly connected circumferentially; The guide collar, whose sealing sleeve is fitted on the outside of the drive rod, is detachably connected to the valve cover; The pressure-reducing elastic element is placed between the adjusting sleeve and the guide ring and is used to adjust the pressure relief threshold.

2. The throttling and shut-off vent valve according to claim 1, characterized in that: The valve core also includes: A guide groove is formed in the middle of the adjusting sleeve, and each guide protrusion groove is placed in the corresponding guide groove and can slide along the guide groove.

3. A throttling and shut-off venting valve according to claim 2, characterized in that: The control component includes: The adjusting screw is threaded into the middle of the valve cover, and its lower end is fixedly connected to the drive rod, and is used to control the position of the adjusting sleeve; The pressure relief rod passes through the middle of the adjusting screw and the drive rod, and is movably sealed with the adjusting screw and the drive rod. The lower end of the pressure relief rod is fixedly connected to the upper end of the sealing sleeve. The upper elastic element is fitted onto the end of the pressure relief rod, and its upper and lower ends are fixedly connected to the pressure relief rod and the adjusting screw, respectively.

4. A throttling and shut-off vent valve according to claim 1, characterized in that: The inner side of the guide sleeve is provided with a pressure relief groove; The outer side of the closed sleeve is detachably equipped with a guide slider, and its end is placed in a pressure relief groove and can slide along it.

5. A throttling and shut-off vent valve according to claim 1, characterized in that: The output slot is Z-shaped, and its width gradually increases from bottom to top.

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