Low-inlet and high-outlet type pressure reduction regulating valve

Abstract

The utility model discloses a low-inlet and high-outlet type depressurization regulating valve which is of a low-inlet and high-outlet structure, that is, an inlet of a fluid inlet channel is lower than an outlet of a fluid pressure relief channel, and the fluid inlet channel can guide fluid to the bottom of a liquid inlet channel; the fluid is discharged out of the pressure relief cavity in the circumferential direction of the valve element after being subjected to pressure relief through at least one bent part of the flow slowing channel, the pressure relief cavity guides the fluid to the fluid pressure relief channel to be discharged, the low-inlet and high-outlet structure counteracts fluid kinetic energy through gravitational potential energy, the flow speed of the fluid entering the valve element is reduced, and erosion to the adjusting valve is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fluid control equipment technology, specifically to a low-inlet, high-outlet pressure reducing regulating valve suitable for high pressure differential conditions, especially suitable for pipeline systems in petroleum, chemical, and energy systems that require stable pressure reduction and flow regulation. Background Technology

[0002] In the field of high-pressure differential fluid control, traditional control valves generally adopt a high-inlet, low-outlet or equal-height inlet and outlet structure. Although this design simplifies the pipeline layout, it still has technical defects. In traditional high-inlet, low-outlet or equal-height control valves, the high-pressure fluid is accelerated by gravity and rushes directly to the valve core, causing erosion of the valve core and easily creating vortices in the high-speed jet in the pressure relief chamber, resulting in local erosion of the valve body. Utility Model Content

[0003] This utility model provides a low-inlet, high-outlet pressure reducing regulating valve, which adopts a low-inlet, high-outlet structure, that is, the inlet of the fluid inlet channel is lower than the outlet of the fluid pressure relief channel. The fluid inlet channel can guide the fluid to the bottom of the inlet channel, so that the fluid is depressurized after passing through at least one bend in the slow flow channel and then discharged from the pressure relief chamber circumferentially through the valve core. The pressure relief chamber then guides the fluid to the fluid pressure relief channel for discharge. The low-inlet, high-outlet structure uses gravitational potential energy to counteract the fluid kinetic energy, reducing the flow velocity of the fluid entering the valve core and reducing the erosion of the regulating valve.

[0004] A low-inlet, high-outlet pressure-reducing regulating valve, comprising:

[0005] The valve seat has a hollow interior forming a pressure relief chamber; a cover mounting position is provided on the top of the valve seat, and the cover mounting position is connected to the pressure relief chamber; a fluid inlet channel is provided on one side of the valve seat, and a fluid pressure relief channel is provided on the other side, and the fluid inlet channel and the fluid pressure relief channel are connected to the pressure relief chamber; and the inlet of the fluid inlet channel is lower than the outlet of the fluid pressure relief channel.

[0006] The valve core is disposed in the pressure relief chamber, and a liquid inlet channel is provided through the middle of the valve core; the valve core is provided with at least one slow flow channel along the circumference, the slow flow channel is connected to the liquid inlet channel, and the slow flow channel is provided with at least one bend.

[0007] A valve cover is detachably installed in the cover mounting position and clamps and fixes the valve core in the pressure relief chamber; the valve cover is provided with an adjustment groove.

[0008] An adjusting valve stem, one end of which is adapted to the liquid inlet channel, and the other end of which extends out of the valve cover through the adjusting groove, and the adjusting valve stem is movably connected to the adjusting groove; the other end of the adjusting valve stem can be driven by an external force to move one end of the adjusting valve stem along the adjusting groove to open or close the inlet of the slow flow channel;

[0009] When the inlet of the slow-flow channel is open, under pressure, the fluid inlet channel can guide the fluid to the bottom of the liquid inlet channel, so that the fluid is depressurized after passing through at least one bend in the slow-flow channel and then discharged from the pressure relief chamber circumferentially by the valve core. The pressure relief chamber then guides the fluid to the fluid pressure relief channel for discharge.

[0010] Furthermore, in a more preferred embodiment of this utility model, the valve core includes:

[0011] At least one stacked plate, the at least one stacked plate is provided with at least one slow flow channel, and one inlet of the at least one slow flow channel corresponds to multiple outlets, the multiple outlets being evenly distributed along the circumference of the at least one stacked plate;

[0012] End caps are provided at the upper and lower ends of the at least one stacked piece, and the outer periphery of the end caps is flush with the outer periphery of the at least one stacked piece.

[0013] Furthermore, as a more preferred embodiment of the present invention, the top of the at least one stacked piece is provided with a guide insertion portion in the shape of a frustum, and the bottom of the at least one stacked piece is provided with a guide slot adapted to the guide insertion portion; when multiple stacked pieces are provided, adjacent stacked pieces can be positioned and inserted into each other through the guide insertion portion and the guide slot, so that multiple stacked pieces can be installed coaxially and with their outer peripheral contours flush.

[0014] Furthermore, as a more preferred embodiment of this utility model, when multiple stacked pieces are provided, adjacent stacked pieces are respectively provided with positioning grooves corresponding to each other, and the positioning grooves of adjacent stacked pieces are connected to each other by positioning pins.

[0015] Furthermore, as a more preferred embodiment of this utility model, the liquid inlet channel is coaxially arranged with the valve core, and when multiple stacked plates are arranged, the liquid outlet of the at least one slow-flow channel of each stacked plate is evenly distributed in a spiral shape along the outer periphery of the valve core.

[0016] Furthermore, as a more preferred embodiment of this utility model, the inner ring of the end cap near the fluid inlet channel is provided with a flow guide flare; and the bottom center of the end cap is provided with an annular protrusion, which is used to position the bottom of the pressure relief chamber; the bottom end face of the end cap is provided with a sealing ring groove, and a sealing ring is provided in the sealing ring groove, with the sealing ring clamped between the bottom of the pressure relief chamber and the sealing ring groove.

[0017] Furthermore, as a more preferred embodiment of this utility model, the port of the regulating channel is provided with a stepped expansion groove, and at least one sealing ring is installed in the stepped expansion groove. The at least one sealing ring is used to seal the gap between the regulating valve stem and the stepped expansion groove. A cover ring is installed at the port of the stepped expansion groove. The cover ring is fastened to the end face of the valve cover by bolts, and the cover ring can press the at least one sealing ring against the stepped expansion groove.

[0018] Furthermore, as a more preferred embodiment of the present invention, the fluid inlet channel is inclinedly disposed on the valve seat, and the end of the fluid inlet channel is connected to the bottom of the pressure relief chamber, so that the initial end of the fluid inlet channel is higher than the end position.

[0019] Furthermore, as a more preferred embodiment of the present invention, the fluid pressure relief channel is inclinedly disposed on the valve seat, and the initial end of the fluid pressure relief channel is connected to one side of the middle part of the pressure relief chamber, so that the initial end of the fluid pressure relief channel is higher than the end position.

[0020] Furthermore, as a more preferred embodiment of this utility model, the middle part of the regulating valve stem is threadedly connected to the middle part of the regulating through groove; the end of the regulating valve stem is provided with an adjusting plane part for tool operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0022] Figure 1 This is a half-sectional schematic diagram of the regulating valve in this embodiment.

[0023] Figure 2 This is an exploded view of the regulating valve in this embodiment.

[0024] Figure 3 This is an exploded view of the valve core structure in this embodiment.

[0025] Figure 4 This is a schematic diagram of a half-section of another valve core in this embodiment.

[0026] Figure 5 This is a schematic diagram of the half-section structure of the stacked sheets in this embodiment.

[0027] Figure 6 This is a schematic diagram of the overall three-dimensional structure of the regulating valve in this embodiment.

[0028] Figure label:

[0029] 1-Valve seat, 2-Valve core, 3-Valve cover, 4-Adjusting valve stem, 11-Pressure relief chamber, 12-Cover mounting position, 13-Fluid inlet channel, 14-Fluid pressure relief channel, 21-Liquid inlet channel, 22-Slow flow channel, 23-Layer plate, 24-End cap, 31-Adjusting through groove, 32-Limiting protrusion, 41-Adjusting flat part, 111-Annular flare, 221-Bending part, 231-Guide insertion part, 232-Guide slot, 233-Positioning groove, 241-Flow guiding flare, 242-Annular protrusion, 243-Sealing ring groove, 311-Stepped flare, 312-Sealing ring body, 313-Covering ring body, 314-Sleeve, 321-Positioning groove, a-Bending structure, b-Liquid inlet, c-Liquid outlet. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0034] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0035] Example

[0036] This embodiment aims to address the shortcomings of existing technologies in high-pressure differential fluid control, where traditional control valves commonly employ high-inlet, low-outlet or equal-height inlet / outlet structures. While this design simplifies piping layout, it still presents technical drawbacks. In traditional high-inlet, low-outlet or equal-height control valves, the high-pressure fluid, accelerated by gravity, directly impacts the valve core 2, causing erosion of the valve core 2 and easily leading to vortex formation in the high-speed jet within the pressure relief chamber 11, resulting in localized erosion of the valve body. Therefore, referring to... Figure 1-6 As shown, this embodiment provides a low-inlet, high-outlet pressure reducing regulating valve. It adopts a low-inlet, high-outlet structure, that is, the inlet of the fluid inlet channel 13 is lower than the outlet of the fluid pressure relief channel 14. The fluid inlet channel 13 can guide the fluid to the bottom of the inlet channel 21, so that the fluid is depressurized after passing through at least one bend 221 of the slow flow channel 22 and then discharged from the circumferential pressure relief chamber 11 of the valve core 2. The pressure relief chamber 11 then guides the fluid to the fluid pressure relief channel 14 for discharge. The low-inlet, high-outlet structure uses gravitational potential energy to counteract the fluid kinetic energy, and the flow rate of the fluid entering the valve core 2 is reduced, thereby reducing the erosion of the regulating valve.

[0037] Reference Figure 1-2 As shown in Figure 6, a low-inlet, high-outlet pressure-reducing regulating valve includes: valve seat 1, valve core 2, valve cover 3, and regulating valve stem 4.

[0038] The valve seat 1 has a hollow interior forming a pressure relief chamber 11; a cover mounting position 12 is provided on the top of the valve seat 1, which is connected to the pressure relief chamber 11; a fluid inlet channel 13 is provided on one side of the valve seat 1, and a fluid pressure relief channel 14 is provided on the other side, which are connected to the pressure relief chamber 11; and the inlet of the fluid inlet channel 13 is lower than the outlet of the fluid pressure relief channel 14.

[0039] The valve core 2 is disposed in the pressure relief chamber 11, and the inlet channel 21 is provided through the middle of the valve core 2; the valve core 2 is provided with at least one slow flow channel 22 along the circumference, the slow flow channel 22 is connected to the inlet channel 21, and the slow flow channel 22 is provided with at least one bend 221.

[0040] The valve cover 3 is detachably installed in the cover mounting position 12 and clamps and fixes the valve core 2 in the pressure relief chamber 11. The valve cover 3 is provided with an adjustment groove 31. For example, multiple screws are evenly distributed on the top of the valve seat 1. After the valve cover 3 is installed in the cover mounting position 12, it is pre-tightened and fixed by nuts. One end of the valve cover 3 is provided with a limiting protrusion 32 that matches the valve core 2. The limiting protrusion 32 can extend into the top of the pressure relief chamber 11 and abut against the top of the valve core 2. In some embodiments, the surface of the limiting protrusion 32 is provided with a positioning groove 321, and the top of the valve core 2 is provided with a locking protrusion that matches the positioning groove 321.

[0041] One end of the regulating valve stem 4 is adapted to the liquid inlet channel 21, and the other end extends out of the valve cover 3 through the regulating groove 31. The regulating valve stem 4 is movably connected to the regulating groove 31. The other end of the regulating valve stem 4 can be driven by external force to move one end of the regulating valve stem 4 along the regulating groove 31 to open or close the inlet of the slow flow channel 22.

[0042] When the inlet of the slow flow channel 22 is open, under pressure, the fluid inlet channel 13 can guide the fluid to the bottom of the liquid inlet channel 21, so that the fluid is depressurized after passing through at least one bend 221 of the slow flow channel 22 and then discharged from the pressure relief chamber 11 circumferentially by the valve core 2. The pressure relief chamber 11 then guides the fluid to the fluid pressure relief channel 14 for discharge.

[0043] It should be noted that the size of the cover mounting position 12 is adapted to the valve core 2, allowing the valve core 2 to be installed from top to bottom into the pressure relief chamber 11 from the cover mounting position 12. For example, the pressure relief chamber 11 is a cylindrical inner cavity adapted to the valve core 2. In its cross-sectional state, the fluid inlet channel 13 has a structure similar to a "√", with the inlet end located on the side wall of the valve seat 1 and the outlet end connected to the bottom middle of the pressure relief chamber 11. That is, the fluid inlet has a bending structure a. When the high-pressure fluid flows in from the fluid inlet channel 13, it passes through the bending structure a of the fluid inlet to reduce the impact force before being transmitted to the bottom of the valve core 2, reducing the direct impact on the valve core 2.

[0044] It should be added that an annular flare 111 is provided in the middle of the pressure relief chamber 11, so that there is a certain gap between the outer periphery of the valve core 2 and the pressure relief chamber 11 to allow fluid to be discharged. The initial end of the fluid pressure relief channel 14 is connected to one side of the annular flare 111.

[0045] Reference Figure 3As shown, in some embodiments, the valve core 2 includes at least one stacked plate 23 and an end cap 24. The at least one stacked plate 23 is provided with at least one slow-flow channel 22, and one inlet b of the at least one slow-flow channel 22 corresponds to a plurality of outlets c, which are evenly distributed along the circumference of the at least one stacked plate 23; the upper end and the lower end of the at least one stacked plate 23 are respectively provided with end caps 24, and the outer peripheral contour of the end caps 24 is flush with the outer peripheral contour of the at least one stacked plate 23.

[0046] Reference Figure 4-5 As shown, in some embodiments, at least one stacked piece 23 has a guide insertion portion 231 in the shape of a frustum at its top, and at least one stacked piece 23 has a guide slot 232 adapted to the guide insertion portion 231 at its bottom. When there are multiple stacked pieces 23, adjacent stacked pieces 23 can be positioned and inserted into each other through the guide insertion portion 231 and the guide slot 232, so that multiple stacked pieces 23 can be coaxially installed and have flush outer periphery contours.

[0047] Reference Figure 3 As shown, in some embodiments, when multiple stacked pieces 23 are provided, adjacent stacked pieces 23 are respectively provided with corresponding positioning grooves 233, and the positioning grooves 233 of adjacent stacked pieces 23 are connected to each other by positioning pins. It can be understood that the positioning grooves 233 can be through-type, with multiple stacked pieces 23 positioned and fitted onto a single positioning pin. The positioning grooves 233 can also be non-through-type, with a single positioning pin connecting adjacent stacked pieces 23. Similarly, the stacked pieces 23 and the end cap 24 can also be connected together by positioning pins.

[0048] In some embodiments, the inlet channel 21 is coaxially arranged with the valve core 2. When multiple laminations 23 are provided, the outlet c of at least one slow-flow channel 22 of each lamination 23 is evenly distributed in a spiral shape along the outer periphery of the valve core 2. It can be understood that at least one slow-flow channel 22 of each lamination 23 forms a spiral gradient flow channel on the body of the valve core 2. For example, at least one slow-flow channel 22 of the lamination 23 adopts an eccentric involute flow channel. For example, fluid is ejected tangentially along the circumference of the valve core 2 through 32 eccentric involute outlets.

[0049] Reference Figure 1 As shown, in some embodiments, the inner ring of the end cap 24 near the fluid inlet channel 13 is provided with a flow guide flare 241; and the bottom center of the end cap 24 is provided with an annular protrusion 242, which is used to position the bottom of the pressure relief chamber 11; the bottom end face of the end cap 24 is provided with a sealing ring groove 243, and a sealing ring is provided in the sealing ring groove 243, and the sealing ring is clamped between the bottom of the pressure relief chamber 11 and the sealing ring groove 243.

[0050] Reference Figure 1As shown, in some embodiments, the port of the regulating groove 31 is provided with a stepped expansion groove 311, and at least one sealing ring 312 is installed in the stepped expansion groove 311. The at least one sealing ring 312 is used to seal the gap between the regulating valve stem 4 and the stepped expansion groove 311. A cover ring 313 is installed at the port of the stepped expansion groove 311. The cover ring 313 is fastened to the end face of the valve cover 3 by bolts, and the cover ring 313 can press at least one sealing ring 312 against the stepped expansion groove 311. Exemplarily, the cover ring 313 and at least one sealing ring 312 are abutted by a sleeve 314.

[0051] Reference Figure 1 As shown, in some embodiments, the fluid inlet channel 13 is inclinedly disposed on the valve seat 1, and the end of the fluid inlet channel 13 is connected to the bottom of the pressure relief chamber 11, so that the initial end of the fluid inlet channel 13 is higher than the end position.

[0052] Reference Figure 1 As shown, in some embodiments, the fluid pressure relief channel 14 is inclinedly disposed on the valve seat 1, and the initial end of the fluid pressure relief channel 14 is connected to one side of the middle of the pressure relief chamber 11, so that the initial end of the fluid pressure relief channel 14 is higher than the end position.

[0053] Reference Figure 1 As shown, in some embodiments, the middle part of the regulating valve stem 4 is threadedly connected to the middle part of the regulating through groove 31; the end of the regulating valve stem 4 is provided with an adjusting plane part 41 for tool operation, for example, an adjusting plane part 41 for wrench clamping.

[0054] Working principle of regulating valve

[0055] Low-inlet, high-outlet fluid guiding stage: High-pressure fluid enters valve seat 1 from the inlet of fluid inlet channel 13, which is lower than the outlet of fluid pressure relief channel 14, and impacts fluid inlet channel 13 at the bottom of pressure relief chamber 11 along the inclined flow channel; Gravitational potential energy conversion: The potential energy generated by the inlet height difference offsets part of the fluid kinetic energy, and the inlet flow velocity decreases.

[0056] Valve core 2 slow flow and pressure reduction stage: After the fluid enters the bottom of the inlet channel 21, it enters the slow flow channel 22 under the control of the opening of the regulating valve stem 4. The multi-stage bending causes the fluid kinetic energy to decrease.

[0057] The device provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A low-in high-out pressure reducing regulating valve, characterized by, include: The valve seat has a hollow interior forming a pressure relief chamber; a cover mounting position is provided on the top of the valve seat, and the cover mounting position is connected to the pressure relief chamber; a fluid inlet channel is provided on one side of the valve seat, and a fluid pressure relief channel is provided on the other side, and the fluid inlet channel and the fluid pressure relief channel are connected to the pressure relief chamber; and the inlet of the fluid inlet channel is lower than the outlet of the fluid pressure relief channel. A valve core is disposed within the pressure relief chamber, and an inlet channel is provided through the middle of the valve core; the valve core is provided with at least one slow-flow channel along the circumference, the slow-flow channel is connected to the inlet channel, and the slow-flow channel is provided with at least one bend. A valve cover is detachably installed in the cover mounting position and clamps and fixes the valve core in the pressure relief chamber; the valve cover is provided with an adjustment groove. An adjusting valve stem, one end of which is adapted to the liquid inlet channel, and the other end of which extends out of the valve cover through the adjusting groove, and the adjusting valve stem is movably connected to the adjusting groove; the other end of the adjusting valve stem can be driven by an external force to move one end of the adjusting valve stem along the adjusting groove to open or close the inlet of the slow flow channel; When the inlet of the slow-flow channel is open, under pressure, the fluid inlet channel can guide the fluid to the bottom of the liquid inlet channel, so that the fluid is depressurized after passing through at least one bend in the slow-flow channel and then discharged from the pressure relief chamber circumferentially by the valve core. The pressure relief chamber then guides the fluid to the fluid pressure relief channel for discharge.

2. The regulating valve according to claim 1, characterized in that The valve core includes: At least one stacked plate, the at least one stacked plate is provided with at least one slow flow channel, and one inlet of the at least one slow flow channel corresponds to multiple outlets, the multiple outlets being evenly distributed along the circumference of the at least one stacked plate; End caps are provided at the upper and lower ends of the at least one stacked piece, and the outer periphery of the end caps is flush with the outer periphery of the at least one stacked piece.

3. The regulating valve according to claim 2, characterized in that The top of at least one stacked piece is provided with a guide insertion part in the shape of a frustum, and the bottom of the at least one stacked piece is provided with a guide slot adapted to the guide insertion part; when there are multiple stacked pieces, adjacent stacked pieces can be positioned and inserted into each other through the guide insertion part and the guide slot, so that multiple stacked pieces can be installed coaxially and with their outer peripheral contours flush.

4. The regulating valve according to claim 2, characterized in that When multiple stacked pieces are provided, adjacent stacked pieces are provided with corresponding positioning slots, and the positioning slots of adjacent stacked pieces are connected to each other by positioning pins.

5. The regulating valve according to claim 3, characterized in that The inlet channel is coaxially arranged with the valve core. When multiple stacked plates are arranged, the outlet of the at least one slow-flow channel of each stacked plate is evenly distributed in a spiral shape along the outer periphery of the valve core.

6. The regulating valve according to claim 2, characterized in that The inner ring of the end cap near the fluid inlet channel is provided with a flow guide flare; and the bottom center of the end cap is provided with an annular protrusion, which is used to position the bottom of the pressure relief chamber; the bottom end face of the end cap is provided with a sealing ring groove, and a sealing ring is provided in the sealing ring groove, and the sealing ring is clamped between the bottom of the pressure relief chamber and the sealing ring groove.

7. The regulating valve according to claim 1, characterized in that The port of the regulating channel is provided with a stepped expansion groove, and at least one sealing ring is installed in the stepped expansion groove. The at least one sealing ring is used to seal the gap between the regulating valve stem and the stepped expansion groove. The port of the stepped expansion groove is provided with a cover ring, and the cover ring is fastened to the end face of the valve cover by bolts. At the same time, the cover ring can press the at least one sealing ring against the stepped expansion groove.

8. The regulating valve according to claim 1, characterized in that The fluid inlet channel is inclinedly disposed on the valve seat, and the end of the fluid inlet channel is connected to the bottom of the pressure relief chamber, so that the initial end of the fluid inlet channel is higher than the end position.

9. The regulating valve according to claim 1 or 8, characterized in that The fluid pressure relief channel is inclinedly disposed on the valve seat, and the initial end of the fluid pressure relief channel is connected to one side of the middle part of the pressure relief chamber, so that the initial end of the fluid pressure relief channel is higher than the end position.

10. The regulating valve according to claim 2, characterized in that The middle part of the regulating valve stem is threadedly connected to the middle part of the regulating through groove; the end of the regulating valve stem is provided with an adjusting plane for tool operation.

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