Throttling cut-off emptying valve

Abstract

The invention discloses a throttling cut-off emptying valve, and relates to the technical field of valves, the throttling cut-off emptying valve comprises a valve body, a flow inlet channel, a flow outlet channel, a valve core, a valve cover and a control assembly, the valve core is used for controlling connection and disconnection of the flow inlet channel and the flow outlet channel, and the valve core comprises a guide sleeve, a sealing sleeve and an adjusting sleeve; the control assembly adjusts the adjusting sleeve to slide relative to the sealing sleeve so as to adjust the output flow of the valve body, and throttling is controlled. When the sealing sleeve slides relative to the guide sleeve, the pressure in the flow inlet channel is quickly emptied; the adjusting sleeve slides relative to the control assembly and can relieve pressure of the inflow channel. By arranging the components, the purpose of quick emptying is effectively achieved, and the automatic pressure relief function is added.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a throttle stop and vent valve. Background Art

[0002] In petrochemical, natural gas transportation, and high-pressure pipeline systems, throttle valves, globe valves, and vent valves are core components to ensure the safe operation of the system. Traditional valve designs are usually complex to operate, especially in high-pressure and multi-condition scenarios, there are technical bottlenecks. Although traditional throttle valves can adjust the flow rate by changing the opening of the valve core, their structural design cannot achieve rapid venting. In emergency situations, an independent vent valve is required, resulting in a lag in response and occupying space.

[0003] For example, a spring-type multi-stage throttle and vent valve with the 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 throttle sleeve; in the valve body, the valve seat, the throttle sleeve, the valve core, and the valve sleeve are sequentially installed from bottom to top. A plurality of first throttle holes are provided on the outer peripheral surface of the valve seat, a plurality of second throttle holes are alternately provided on the outer peripheral surface of the valve sleeve near the lower side, a third throttle hole is provided on the outer peripheral surface of the middle part of the throttle sleeve, and a multi-stage sealing structure is provided between the valve seat and the valve core, and the multi-stage sealing structure is used to close the fluid passage flowing from the first throttle hole to the second throttle hole.

[0004] There are some problems in the above technical solutions during use. When the vent valve is in use, it cannot automatically relieve pressure when the equipment is under high pressure. The relatively high pressure will cause damage to the equipment and the vent valve, and it cannot quickly relieve pressure in an emergency, affecting the safety of equipment operation.

[0005] Therefore, it is necessary to invent a throttle stop and vent valve to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a throttle stop and vent valve to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: A throttling cut-off and vent valve, comprising: a valve body, with an inlet flow passage and an outlet flow passage formed inside; a valve core, detachably arranged in the middle of the valve body for controlling the on-off of the inlet flow passage and the outlet flow passage; a valve cover, detachably installed on the top of the valve body for sealing the valve body; a control assembly, arranged at the upper end of the valve core, penetrating through the middle of the valve cover and sealingly cooperating with the valve cover for adjusting the state of the valve core; the valve core includes a guiding sleeve, threadedly installed in the middle of the valve body and communicating the inlet flow passage and the outlet flow passage; a closing sleeve, movably sleeved inside the guiding sleeve; an adjusting sleeve, placed in the outlet flow passage and sealingly and movably sleeved outside the closing sleeve; by adjusting the control assembly to make the adjusting sleeve slide relative to the closing sleeve to adjust the output flow of the valve body and control throttling; when the closing sleeve slides relative to the guiding sleeve, the pressure in the inlet flow passage is rapidly vented; when the adjusting sleeve slides relative to the control assembly, the inlet flow passage can be depressurized.

[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 circumferentially and evenly formed on it, so that its outside communicates with the outlet flow passage, and the adjusting sleeve is movably sleeved inside the fixed sleeve; a throttling groove, formed on the circumference of the adjusting sleeve and communicating with the pressure relief groove; an output groove, formed on the circumference of the closing sleeve and the inside of which communicates with the inlet flow passage; by controlling the overlapping area of the throttling groove and the output groove, the output flow of the vent valve is adjusted.

[0009] Preferably, the valve core further includes: a driving rod, the upper end of which is fixedly connected to the control assembly, and a plurality of guiding protrusions are circumferentially fixedly connected thereto; a guiding collar, sealingly sleeved outside the driving rod and detachably connected to the valve cover; a downward pressing elastic member, placed between the adjusting sleeve and the guiding collar for adjusting the pressure relief threshold.

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

[0011] Preferably, the control assembly includes: an adjusting screw tube, threadedly engaged in the middle of the valve cover, and the lower end of which is fixedly connected to the driving rod for controlling the position of the adjusting sleeve; a pressure relief rod, penetrating through the middle of the adjusting screw tube and the driving rod, and movably sealed with the adjusting screw tube and the driving rod, the lower end of the pressure relief rod is fixedly connected to the upper end of the closing sleeve; an upward pulling elastic member, sleeved on the end of the pressure relief rod, and the upper and lower ends are respectively fixedly connected to the pressure relief rod and the adjusting screw tube.

[0012] Preferably, a pressure relief chute is formed inside the guiding sleeve; a guiding slider is detachably installed on the outside of the closing sleeve, and the end is placed in the pressure relief chute and can slide along it.

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

[0014] Technical effects and advantages of the present invention:

[0015] 1. By setting the control component, guiding sleeve, pressure relief chute and adjusting sleeve, the present invention effectively achieves the purpose of rapid emptying. During use, pull the pressure relief rod upward to place the guiding slider in the rotating section, then rotate the pressure relief rod and release it, and then pull the elastic member upward to quickly slide the guiding slider to the end of the pressure relief section, making the output slot, throttling slot and pressure relief slot correspond to complete the rapid emptying operation, avoiding equipment or pressure relief valve failures caused by long-term high pressure and achieving the purpose of rapid emptying in an emergency.

[0016] 2. By setting the sealing sleeve, adjusting sleeve, driving rod, guiding convex block, guiding collar, downward pressing elastic member and guiding chute, the present invention effectively increases the function of automatic pressure relief. During use, through the control component, the bottom of the guiding slider does not contact the guiding chute. Then, affected by the pressure in the inflow channel, the adjusting sleeve will slide relative to the sealing sleeve, causing the throttling slot and the output slot to overlap, reducing the pressure in the inflow channel. Subsequently, the downward pressing elastic member pushes the adjusting sleeve downward to reset, completing the pressure relief operation in the inflow channel, avoiding damage to the equipment and the pressure relief valve caused by excessive pressure and extending the service life of the pressure relief valve.

[0017] 3. By setting the pressure relief slot, throttling slot and output slot, the present invention effectively optimizes the throttling function. During use, slide the entire sleeve upward, control the position of the adjusting sleeve relative to the sealing sleeve, make the throttling slot and the output slot overlap, and limit the output flow rate of the valve body by controlling the overlapping area. The width of the output slot gradually increases from bottom to top, enabling the pressure relief valve to be applicable to equipment with higher flow rate requirements. Description of the Drawings

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

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

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

[0021] Figure 4 It is a schematic diagram of the disassembly of the valve core and the control component in the present invention.

[0022] Figure 5 It is a schematic diagram of the positional relationship between the valve core and the control component in the present invention.

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

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

[0025] Figure 8 In the present invention Figure 2 Schematic enlarged view of the partial area A inside.

[0026] Figure 9 This is an unfolded schematic view of the guide sleeve in the present invention.

[0027] In the figure: 1, valve body; 2, inlet flow channel; 3, outlet flow channel; 4, valve core; 5, valve cover; 6, control assembly; 401, guide sleeve; 402, sealing sleeve; 403, adjustment sleeve; 404, fixed sleeve; 405, pressure relief groove; 406, throttling groove; 407, output groove; 408, drive rod; 409, guide projection; 410, guide collar; 411, downward pressing elastic member; 412, guide chute; 4121, end cover; 413, pressure relief chute; 4131, fixed section; 4132, rotating section; 4133, pressure relief section; 414, guide slider; 601, adjustment screw tube; 602, pressure relief rod; 603, upward pulling elastic member. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0029] The present invention provides a throttling shut-off and vent valve as Figures 1 to 9 shown, which includes a valve body 1 with an inlet flow channel 2 and an outlet flow channel 3 opened inside. Connection flanges are provided at the positions of the valve body 1 corresponding to the inlet flow channel 2 and the outlet flow channel 3, so that the valve body 1 can be installed at the required position through bolts; a valve core 4, which is detachably arranged in the middle of the valve body 1 and is used to control the on-off of the inlet flow channel 2 and the outlet flow channel 3. The bottom of the valve core 4 is placed between the inlet flow channel 2 and the outlet flow channel 3 and is sealed and installed to prevent the uncontrolled connection between the inlet flow channel 2 and the outlet flow channel 3; a valve cover 5, which is detachably installed on the top of the valve body 1 and is used to seal the valve body 1. The valve cover 5 and the top of the valve body 1 are installed through flanges and bolts, and a sealing ring is installed between them to prevent the leakage of the valve body 1; a control assembly 6, which is arranged at the upper end of the valve core 4 and penetrates through the valve cover 5 in the middle and is in sealed cooperation with the valve cover 5, and is used to adjust the state of the valve core 4. The control assembly 6 and the valve core 4 cooperate to form a control of the conduction state of the valve body 1.

[0030] Specifically, the valve core 4 includes a guiding sleeve 401, which is threadedly installed in the middle of the valve body 1 and communicates the inlet flow channel 2 with the outlet flow channel 3. A sealing ring is installed at the top of the guiding sleeve 401, and the outside is sealed after the guiding sleeve 401 is installed; a closing sleeve 402, which is movably sleeved inside the guiding sleeve 401, and the upper end of the closing sleeve 402 is hollowed out; an output groove 407, which is formed in the circumferential direction of the closing sleeve 402 and communicates with the inlet flow channel 2 inside. There are multiple output grooves 407, which are evenly distributed at the upper position of the closing sleeve 402; an adjusting sleeve 403, which is placed in the outlet flow channel 3 and is hermetically and movably sleeved outside the closing sleeve 402. The upper inner side of the adjusting sleeve 403 communicates with the inlet flow channel 2, and the pressure in the inlet flow channel 2 can push the adjusting sleeve 403 to move. A throttling groove 406 is formed in the circumferential direction of the adjusting sleeve 403 and communicates with a pressure relief groove 405. There are multiple throttling grooves 406, which are evenly distributed at the lower position of the adjusting sleeve 403; a fixed sleeve 404, the upper end of which is detachably installed at the bottom of the valve cover 5 by means of fixing such as screws or bolts, and a plurality of pressure relief grooves 405 are evenly formed in the circumferential direction, so that the outside communicates with the outlet flow channel 3, and the adjusting sleeve 403 is movably sleeved inside the fixed sleeve 404.

[0031] It should be noted that the control assembly 6 is used to adjust the sliding of the adjusting sleeve 403 relative to the closing sleeve 402 to adjust the output flow of the valve body 1 and control throttling. The larger the overlapping area between the throttling groove 406 and the output groove 407, the larger the flow through the valve core 4. On the contrary, the smaller the flow through. By controlling the overlapping area between the throttling groove 406 and the output groove 407, the output flow of the vent valve is adjusted; the control assembly 6 is used to adjust the sliding of the closing sleeve 402 relative to the guiding sleeve 401 to quickly release the pressure in the inlet flow channel 2. During this process, the closing sleeve 402 quickly descends, so that the output groove 407 and the throttling groove 406 are highly overlapped. At this time, the valve body 1 has the maximum output, and the pressure in the inlet flow channel 2 is quickly released. At the same time, the adjustment conduit can also be manually controlled by the adjustment assembly to reach the upper limit position, so that the output groove 407 and the throttling groove 406 are highly overlapped, and the rapid pressure relief can also be carried out. However, by controlling the movement of the closing sleeve 402 faster, it is suitable for the situation of emergency pressure relief; the adjusting sleeve 403 slides relative to the control assembly 6 to relieve the pressure in the inlet flow channel 2. When the downward pressure of the adjusting sleeve 403 on the control assembly 6 is small, the increase in the pressure in the inlet flow channel 2 can push the adjusting sleeve 403 to slide upward, so that a part of the throttling groove 406 coincides with the output groove 407. At this time, the pressure in the inlet flow channel 2 decreases, achieving the purpose of pressure relief and avoiding the impact of high pressure on the equipment and the valve body 1.

[0032] It should be pointed out that the output groove 407 is Z-shaped, and the width gradually increases from bottom to top, so that the flow through the output groove 407 is larger at the same height, enabling the vent valve to be applicable to equipment with higher flow requirements without affecting the control during throttling.

[0033] Specifically, the valve core 4 further includes: a driving rod 408, the upper end of which is fixedly connected to the control assembly 6, and a plurality of guiding bumps 409 are fixedly connected thereto in the circumferential direction. The driving rod 408 can slide a certain distance relative to the adjusting sleeve 403, and this distance is the maximum movement range of the adjusting sleeve 403 during pressure relief; a guiding collar 410, which is hermetically sleeved outside the driving rod 408 and is detachably connected to the valve cover 5. The guiding collar 410 is installed inside the valve cover 5 by screws, facilitating the disassembly, assembly and maintenance of the device; a downward pressing elastic member 411, which is disposed between the adjusting sleeve 403 and the guiding collar 410 and is used to adjust the pressure relief threshold. The downward pressing elastic member 411 can be a spring or other elastic components that can provide a downward pressing force. When the adjusting sleeve 403 slides upward under the influence of the pressure in the inlet passage 2, the downward pressing elastic member 411 is used to push the adjusting sleeve 403 to slide downward and reset. By installing downward pressing elastic members 411 with different elastic coefficients, the function of pressure relief at different pressure values can be realized.

[0034] More specifically, the valve core 4 further includes: a guiding chute 412, which is opened in the middle of the adjusting sleeve 403. Each guiding bump 409 groove is placed in the corresponding guiding chute 412 and can slide along the guiding chute 412. For the convenience of assembly, an end cover 4121 is installed at the upper end of the adjusting sleeve 403 by screws. During assembly, after the guiding slider 414 is installed in the guiding chute 412, the end cover 4121 is sleeved downward from the end of the driving rod 408 and installed at the top of the adjusting sleeve 403 by screws. At this time, the guiding bump 409 cannot slide out of the guiding chute 412.

[0035] It should be noted that the length of the guiding chute 412 determines the distance that the adjusting sleeve 403 can move during pressure relief, and thus limits the maximum flow rate of the valve body 1 during pressure relief; during use, when the guiding bump 409 is placed at the bottom of the guiding chute 412, the driving rod 408 provides pressure to the adjusting sleeve 403. At this time, the pressure in the inlet passage 2 cannot push the adjusting sleeve 403 to slide upward for pressure relief, and at this time the valve body 1 is in a fully closed state; when the guiding slider 414 is placed in the middle of the guiding chute 412, the distance between the bottom of the guiding bump 409 and the bottom of the guiding chute 412 is the maximum movement range of the adjusting sleeve 403 for pressure relief; when the guiding bump 409 is placed at the top of the guiding chute 412, the guiding bump 409 can pull the adjusting sleeve 403 upward, thereby controlling the position of the adjusting sleeve 403 relative to the closed sleeve 402, so that the throttling groove 406 overlaps with the output groove 407, and by controlling the overlapping area, the output flow rate of the valve body 1 is restricted.

[0036] Specifically, the control component 6 includes: an adjusting solenoid 601, which is threadedly fitted in the middle of the valve cover 5, and the lower end is fixedly connected to the driving rod 408, and is used to control the position of the adjusting sleeve 403. For the convenience of operation, a handwheel is fixedly connected to the upper end of the adjusting solenoid 601. During use, the adjusting solenoid 601 is rotated relative to the valve cover 5 through the handwheel, so as to control the position of the adjusting sleeve 403 relative to the guiding sleeve 401; a pressure relief rod 602, which penetrates through the middle of the adjusting solenoid 601 and the driving rod 408, and is movably sealed with the adjusting solenoid 601 and / or the driving rod 408. The lower end of the pressure relief rod 602 is fixedly connected to the upper end of the closed sleeve 402. For the convenience of operation, an operation plate is fixedly installed at the upper end of the pressure relief rod 602; an upward pulling elastic member 603, which is sleeved on the end of the pressure relief rod 602, and the upper and lower ends are respectively fixedly connected to the pressure relief rod 602 and the adjusting solenoid 601. The upward pulling elastic member 603 can be a tension spring or other elastic components that can provide tensile force. The two ends of the upward pulling elastic member 603 and the pressure relief rod 602 and the adjusting solenoid 601 can be installed by fixing methods such as screws. The specific installation method is not further limited here.

[0037] It should be noted that during use, the operation plate can be pulled upward and rotated to one side, and then the operation plate is released. The upward pulling elastic member 603 pulls the pressure relief rod 602 to slide downward quickly. At this time, the closed sleeve 402 slides downward quickly, so that the output groove 407, the throttling groove 406 and the pressure relief groove 405 are correspondingly arranged, and the quick emptying operation is completed.

[0038] More specifically, a pressure relief chute 413 is arranged inside the guiding sleeve 401. The pressure relief chute 413 is divided into a fixed section 4131, a rotating section 4132 and a pressure relief section 4133, and the fixed section 4131, the rotating section 4132 and the pressure relief section 4133 are communicated in sequence; a guiding slider 414 is detachably installed on the outer side of the closed sleeve 402, and the end is placed in the pressure relief chute 413 and can slide along it. The guiding slider 414 is installed on the side wall of the closed sleeve 402 by threads, and an internal hexagonal socket is arranged at one end for easy installation. During assembly, after the closed sleeve 402 is inserted into the guiding sleeve 401, the guiding slider 414 is installed through the internal hexagonal socket to connect them to each other.

[0039] It should be pointed out that during pressure relief, throttling and normal emptying operations, the guiding slider 414 is placed in the fixed section 4131. At this time, the position of the closed sleeve 402 relative to the guiding sleeve 401 is fixed, and the guiding slider 414 is also placed in the fixed section 4131 during the assembly of the emptying valve; when quickly emptying, the pressure relief rod 602 is pulled upward to make the guiding slider 414 placed in the rotating section 4132, and then the pressure relief rod 602 is rotated to make the guiding slider 414 enter the pressure relief section 4133. After the pressure relief rod 602 is released, the upward pulling elastic member 603 makes the guiding slider 414 quickly slide to the end of the pressure relief section 4133, so that the emptying valve quickly empties the pressure in the inlet passage 2.

[0040] In summary, insert the valve core 4 into the valve body 1, rotate the valve core 4 to threadedly install the guiding sleeve 401 in the valve body 1, and then connect the valve cover 5 to the valve body 1 with bolts to complete the assembly of the vent valve. During the assembly process, select the downward pressing elastic member 411 with different elastic coefficients according to the maximum pressure value that the equipment connected to the inlet flow channel 2 can withstand, and then connect both ends of the vent valve to the corresponding positions with bolts and flanges.

[0041] When it is necessary to completely close the vent valve, rotate the adjusting screw tube 601 to make the driving rod 408 slide downward, and make the guiding bump 409 located at the lower end of the guiding chute 412. At this time, the throttling groove 406 does not overlap with the output groove 407, the vent valve is completely closed, and the inlet flow channel 2 is disconnected from the outlet flow channel 3.

[0042] When it is necessary to prevent large pressure from damaging the equipment connected to the inlet flow channel 2 and the vent valve, rotate the adjusting screw tube 601 to separate the guiding bump 409 from the bottom of the guiding chute 412. The adjusting sleeve 403 slides upward under the influence of the pressure in the inlet flow channel 2, so that the throttling groove 406 overlaps with the output groove 407, connecting the inlet flow channel 2 and the outlet flow channel 3 to release the pressure. The downward pressing elastic member 411 pushes the adjusting sleeve 403 to slide downward to reset, so that the throttling groove 406 is separated from the output groove 407. At this time, the inlet flow channel 2 is disconnected from the outlet flow channel 3, and when the pressure in the inlet flow 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 tube 601 to make the guiding bump 409 contact the top of the guiding chute 412, and continue to rotate, then the adjusting sleeve 403 can slide upward, control the position of the adjusting sleeve 403 relative to the closed 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 venting, rotate the adjusting screw tube 601 to make the adjusting sleeve 403 reach the upper limit position, and make the overlapping area between the throttling groove 406 and the output groove 407 reach the maximum, and at this time, vent the inlet flow channel 2.

[0044] When high pressure occurs and rapid pressure relief and venting are required, pull up the pressure relief rod 602 to make the guiding slider 414 located in the rotating section 4132, then rotate and release the pressure relief rod 602 to make the guiding slider 414 enter the pressure relief section 4133, and the guiding slider 414 is quickly slid to the end of the pressure relief section 4133 under the action of the upward pulling elastic member 603, so that the pressure relief groove 405, the throttling groove 406 and the output groove 407 correspond, and quickly vent the pressure in the inlet flow channel 2 of the vent valve, avoiding the problem of long time required for manually adjusting to the maximum discharge flow.

[0045] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are 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 recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A throttle cut-off and vent valve, characterized in that, Comprising: A valve body, within which an inlet flow channel and an outlet flow channel are provided; A valve core, which is detachably arranged in the middle of the valve body and is used to control the on-off of the inlet flow channel and the outlet flow channel; A valve cover, which is detachably installed on the top of the valve body and is used to seal the valve body; A control assembly, which is arranged at the upper end of the valve core, penetrates through the valve cover in the middle and is in sealed cooperation with the valve cover, and is used to adjust the state of the valve core; The valve core includes a guiding sleeve, which is threadedly installed in the middle of the valve body and communicates the inlet flow channel and the outlet flow channel; A closing sleeve, which is movably sleeved inside the guiding sleeve; An adjusting sleeve, which is placed in the outlet flow channel and is hermetically and movably sleeved outside the closing sleeve; The output flow of the valve body is adjusted by the control assembly to slide the adjusting sleeve relative to the closing sleeve to control throttling; when the closing sleeve slides relative to the guiding sleeve, the pressure in the inlet flow channel is quickly emptied; when the adjusting sleeve slides relative to the control assembly, the inlet flow channel can be depressurized.

2. The throttle stop and vent valve according to claim 1, characterized in that: The valve core further includes: A fixed sleeve, whose upper end is detachably installed at the bottom of the valve cover, and a plurality of pressure relief grooves are evenly arranged in the circumferential direction, so that its outside communicates with the outlet flow channel, and the adjusting sleeve is movably sleeved inside the fixed sleeve; A throttling groove, which is arranged in the circumferential direction of the adjusting sleeve and communicates with the pressure relief groove; An output groove, which is arranged in the circumferential direction of the closing sleeve, and its inside communicates with the inlet flow channel; The output flow of the vent valve is adjusted by controlling the overlapping area of the throttling groove and the output groove.

3. The throttle stop and drain valve according to claim 1, characterized in that: The valve core further includes: A driving rod, whose upper end is fixedly connected to the control assembly, and a plurality of guiding bumps are fixedly connected in the circumferential direction; A guiding collar, which is hermetically sleeved outside the driving rod and is detachably connected to the valve cover; A downward pressing elastic member, which is placed between the adjusting sleeve and the guiding collar and is used to adjust the pressure relief threshold.

4. The throttle stop and drain valve according to claim 3, characterized in that: The valve core further includes: A guiding chute, which is arranged in the middle of the adjusting sleeve, and each guiding bump groove is placed in the corresponding guiding chute and can slide along the guiding chute.

5. The throttle stop and vent valve according to claim 3, characterized in that: The control assembly includes: An adjusting screw tube, which is threadedly engaged in the middle of the valve cover, and its lower end is fixedly connected to the driving rod and is used to control the position of the adjusting sleeve; A pressure relief rod, which penetrates through the middle of the adjusting screw tube and the driving rod and is hermetically movable with the adjusting screw tube and the driving rod, and the lower end of the pressure relief rod is fixedly connected to the upper end of the closing sleeve; An upward pulling elastic member, which is sleeved on the end of the pressure relief rod, and its upper and lower ends are respectively fixedly connected to the pressure relief rod and the adjusting screw tube.

6. The throttle stop and vent valve according to claim 2, characterized in that: A pressure relief chute is arranged inside the guiding sleeve; A guiding slider is detachably installed on the outside of the closing sleeve, and its end is placed in the pressure relief chute and can slide along it.

7. The throttle shut-off and vent valve according to claim 2, characterized in that: The output groove is Z-shaped, and its width gradually increases from bottom to top.

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