Throttle valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a throttling valve. Comprising a valve body, a valve cover and a valve rod, a medium inlet and a medium outlet are formed in the valve body, a valve port is formed in the valve body, the valve port is communicated with the medium inlet and the medium outlet, and a valve cylinder is rotationally installed at the position, at the valve port, in the valve body; one end of the valve rod extends into the valve body through the end, away from the medium outlet, of the valve port and is connected with a valve element, and a driving assembly is installed at the other end of the valve rod. A middle wall with a hole is arranged in the middle of the valve cylinder, and medium inlet holes are formed in the outer wall of the first end of the valve cylinder in a circumferential array mode. In the application, the direction of the fluid impacting the valve core is changed through the rotation of the valve cylinder, so that the impact of the high-pressure fluid on the valve core can be reduced; and meanwhile, when the fluid carries impurities such as fixed particles, the valve cylinder collides with the fixed particles firstly, abrasion to the valve element can be relieved, and the performance of the throttling valve is stable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field, concretely relates to a throttle valve. BACKGROUND

[0002] The throttle valve is mainly applied to the fields such as coal gas, petroleum, petrochemical, chemical industry, water treatment, is used to control the flow and pressure of fluid, guarantees the normal operation of equipment. Its applicable medium is mainly: coal gas, oil product, steam, water, nitrogen hydrogen mixed gas lye and liquid ammonia etc. Among them, when fluid flows into the throttle valve, the throttle valve can hinder fluid operation, reduces impact force, and plays the role of pressure buffering to fluid.

[0003] However, the fluid under high pressure has greater energy and flow rate, and when flowing through the throttle valve, can produce strong scouring effect to the internal passage, valve core, valve seat and other components of the throttle valve, resulting in the aggravation of wear of these components. And if the fluid contains solid particles and other impurities, under the action of high pressure, these particles can impact the surface of the valve core and valve seat of the throttle valve at a higher speed, causing more serious abrasive wear, reducing the performance of the throttle valve, and even causing failure.

[0004] And the traditional throttle valve is only a simple structure of valve seat, valve core and valve rod combination, executes structure or hand wheel drive valve rod rotation, valve rod connects valve core and provides opening and closing force for the operation of valve core, most of the surface of valve core is directly contacted with fluid during operation, is the main body of fluid scouring and wear, more easily causes the wear of valve core to aggravate, resulting in the performance of throttle valve to decline or even failure, it is necessary to further improve. TECHNICAL CONTENT

[0005] The utility model aims at providing a kind of throttle valve, to solve the problem that throttle valve in prior art is easily affected by medium scouring and wear, resulting in the sealing surface of valve core is damaged and the problem of performance decline.

[0006] To achieve the above technical purpose, the technical scheme adopted by the utility model is as follows:

[0007] The throttling valve comprises a valve body, a valve cover and a valve rod, the valve body is provided with a medium inlet and a medium outlet, the valve body is provided with a valve port, the valve port is communicated with the medium inlet and the medium outlet, the valve body is rotatably installed with a valve cylinder at the valve port, the center line of the valve cylinder is perpendicular to the center line of the medium inlet and is collinear with the center line of the medium outlet; one end of the valve rod is inserted into the valve body through the valve port and is connected with a valve core, the other end of the valve rod is installed with a driving assembly; the middle part of the valve cylinder is provided with a hole-intermediate wall, the first end outer wall of the valve cylinder is circumferentially provided with a medium inlet hole, the first end inner wall of the valve cylinder is provided with a first liquid passing wall, the first liquid passing wall is circumferentially provided with a first liquid passing hole; the second end inner wall of the valve cylinder is provided with a second liquid passing wall, the second liquid passing wall is circumferentially provided with a second liquid passing hole; the medium inlet hole, the first liquid passing hole, the hole-intermediate wall and the second liquid passing hole are communicated to form a medium channel; the outer surface of the valve core is coupled with the inner surface of the first liquid passing wall for adjusting the throttling section of the medium channel; when the area of the throttling section changes, the pressure or flow of the medium passing through the throttling valve also changes, thereby achieving the purpose of throttling.

[0008] In the throttling valve, the medium enters from the medium inlet, passes through the medium inlet hole and the first liquid passing hole, and then enters the hole-intermediate wall from the bottom of the first liquid passing wall; finally, the medium flows out from the medium outlet. The gap between the valve core and the first liquid passing wall is adjusted by rotating the valve rod, so that the area of the throttling section changes. When the valve core is not in contact with the first liquid passing wall, the valve cylinder has high rotation freedom, and the valve cylinder arranged at the valve port can rotate. When the medium (or fluid, specifically coal gas, steam or fuel oil) entering from the medium inlet flows to the valve port, the medium impacts the valve cylinder, and the valve cylinder can alleviate the direct scouring of the medium on the valve core by rotating to protect the valve core. At the same time, if the medium carries impurities, the impurities collide with the valve cylinder first, and then the medium contacts the valve core in the first liquid passing wall, so that the wear of the valve core by the medium is reduced, the valve core is protected, and the performance stability of the throttling valve is ensured.

[0009] Further, the driving assembly at least comprises a rotating wheel, which is installed at the end of the valve rod away from the valve core.

[0010] The valve rod drives the valve core to descend or ascend by rotating the valve rod through the rotating wheel. When the valve core descends, the gap between the outer surface of the valve core and the inner surface of the first liquid passing wall decreases, and the valve core even contacts the first liquid passing wall. When the valve core ascends, the gap between the outer surface of the valve core and the inner surface of the first liquid passing wall increases, so as to realize the coupling between the outer surface of the valve core and the inner surface of the first liquid passing wall.

[0011] Further, the top of the valve cover is provided with a hollow threaded section, the valve stem passes through the middle of the threaded section, a packing pad, a sealing packing and a pressing sleeve are sequentially arranged between the threaded section and the valve stem from bottom to top, the top of the pressing sleeve is fixedly connected to the pressing sleeve nut of the threaded section through screw connection; the valve cover is integrally provided with a connecting bracket, the connecting bracket is connected with a valve stem nut cavity, and a valve stem nut which is threadedly connected with the valve stem is limitingly arranged in the valve stem nut cavity.

[0012] Wherein, the valve stem nut is limited in the valve stem nut cavity, and the valve stem nut does not have the freedom of displacement in the axial direction of the valve stem; when the valve stem rotates, the valve stem will descend or ascend under the limitation of the valve stem nut, thereby driving the valve core to descend or ascend.

[0013] Further, one side of the intermediate wall close to the valve core is provided with an arc wall, and the arc wall is upwardly protruding; the middle of the arc wall is provided with a through hole, and the outer edge of the through hole is connected with the bottom of the first liquid passing wall.

[0014] Wherein, the arc wall can support the first liquid passing wall, so that the contact between the first liquid passing wall and the valve core is more closely; meanwhile, the arc wall can change the flow direction of the medium flowing from the medium inlet.

[0015] Further, the top surface of the arc wall is provided with at least three spiral ribs, and the spiral ribs and the arc wall form a turbine structure, which can assist the rotation of the valve barrel under the driving of the medium.

[0016] In this way, the higher the flow rate or pressure of the medium is, the higher the speed of the valve barrel driven to rotate is, and vice versa.

[0017] Further, the cross section of the first liquid passing wall and the second liquid passing wall in the valve barrel is in the shape of a sandglass.

[0018] Further, the bottom of the valve barrel is provided with a cross plate, the middle of the cross plate is provided with a limiting opening, and a spring is arranged between the limiting opening and the second liquid passing wall.

[0019] Wherein, the spring can provide an elastic force for returning to the center when the valve barrel is eccentric, thereby improving the concentricity of the valve barrel and the valve core.

[0020] The utility model adopting the above technical scheme has the following advantages:

[0021] 1. In the present application, the valve core is in contact with the medium first through the arrangement of the valve barrel, which can relieve the direct impact of the medium on the valve core and protect the valve core; the performance of the throttle valve is stable, and the unstable operation of the traditional valve is optimized.

[0022] 2. In this application, the direction of the fluid impacting the valve core is changed by rotating the valve barrel, which can reduce the impact of high-pressure fluid on the valve core. When the fluid contains fixed particles and other impurities, the valve barrel collides with the fixed particles first, which can slow down the wear on the valve core, stabilize the performance of the throttle valve, and optimize the unstable operation of the traditional valve. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model can be further illustrated by the non-limiting embodiments shown in the drawings.

[0024] Figure 1 It is a perspective structural schematic diagram of the throttle valve of the utility model;

[0025] Figure 2 It is a front view of the throttle valve of the utility model;

[0026] Figure 3 It is a side view of the throttle valve of the utility model;

[0027] Figure 4 It is Figure 3 a sectional view in direction A-A;

[0028] Figure 5 It is Figure 4 an enlarged schematic view at position B;

[0029] Figure 6 It is a structural schematic diagram of the valve barrel in the utility model;

[0030] Figure 7 It is a sectional schematic diagram of the valve barrel in the utility model;

[0031] The main element symbols are explained as follows:

[0032] 100, valve body; 101, valve cover; 102, connecting bracket; 103, valve rod; 104, rotating wheel; 105, inlet flange; 106, outlet flange; 107, medium inlet; 108, medium outlet; 109, valve rod nut cavity; 110, compression sleeve; 111, compression sleeve; 112, threaded section; 113, sealing packing; 114, limiting sleeve; 115, valve barrel; 116, valve core; 117, first liquid passing wall; 118, first liquid passing hole; 119, medium inlet hole; 120, arc wall; 121, intermediate wall; 122, lower accommodating cavity; 123, second liquid passing hole; 124, second liquid passing wall; 125, cross rod; 126, spring; 127, cross plate. DETAILED DESCRIPTION

[0033] The utility model will be combined with the drawings and specific embodiments to be described in detail, it is to explain that, in the drawing or the description, similar or same part all use same figure number, the implementation mode that is not drawn or described in the drawing, the form that is known to ordinary skilled in the art. In addition, the direction language mentioned in the embodiment, for example "up", "down", "top", "bottom", "left", "right", "front", "back" and so on, only refer to the direction of the drawing, and not be used to limit the protection scope of the utility model.

[0034] As Figures 1-7 The utility model discloses a throttle valve, including valve body 100, valve cover 101 and valve rod 103, be provided with medium inlet 107 and medium outlet 108 on valve body 100, be provided with valve port in valve body 100, and the valve port is linked medium inlet 107 and medium outlet 108, wherein, be provided with inlet flange 105 at the right end of valve body 100, be provided with outlet flange 106 at the lower end of valve body 100, and the throttle valve is connected into fluid delivery pipeline through inlet flange 105, outlet flange 106, and medium enters and flows out from the medium inlet 107, the medium outlet 108 formed. Rotatory installation has valve cylinder 115 in valve body 100 at valve port, and the center line of valve cylinder 115 is perpendicular to the center line of medium inlet 107, and the center line of medium outlet 108 is collinear, and one end of valve rod 103 is inserted into valve body 100 and is connected with valve core 116 through the valve port away from the one end of medium outlet 108, and the other end of valve rod 103 is installed drive assembly, and the drive assembly includes runner 104, and runner 104 is installed at the one end of valve rod 103 away from valve core 116, and the valve rod 103 is rotated through rotating runner 104, and the valve rod 103 rotation drives valve core 116 to go up and down. The middle part of valve cylinder 115 is provided with the intermediate wall 121 of hole, and the first end outer wall of valve cylinder 115 is provided with the medium inlet hole 119 of circular array, and the first end inner wall of valve cylinder 115 is provided with the first liquid passage wall 117, and the first end and the first liquid passage wall 117 of valve cylinder 115 form upper accommodating cavity, and the first liquid passage wall 117 is provided with the first liquid passage hole 118 of circular array; The second end inner wall of valve cylinder 115 is provided with the second liquid passage wall 124, and the second end and the second liquid passage wall 124 of valve cylinder 115 form lower accommodating cavity 122, and the second liquid passage wall 124 is provided with the second liquid passage hole 123 of circular array, and the medium inlet hole 119, the first liquid passage hole 118, the intermediate wall 121 of hole and the second liquid passage hole 123 are communicated and constitute medium passage, and the outer surface of valve core 116 and the inner surface of first liquid passage wall 117 are coupled, for adjusting the throttle section of medium passage, when the area of throttle section changes, the pressure or flow of medium through throttle valve also changes, reaches the purpose of throttling.

[0035] In this embodiment, the medium transported by the fluid conveying pipeline is taken as an example of coal gas. After the throttle valve is connected to the fluid conveying pipeline which needs throttling, when the throttle valve operates in the open state, the medium enters from the medium inlet 107, first passes through the medium inlet hole 119, the first liquid passing hole 118, then passes through the gap between the valve core 116 and the first liquid passing wall 117, wherein the value of the gap between the valve core 116 and the first liquid passing wall 117 has been previously set at the initial maximum position, and enters the intermediate wall 121 from the bottom of the first liquid passing wall 117; then enters the second liquid passing wall 124 from the outside of the second liquid passing hole 123, and finally flows out from the medium outlet 108. During the operation of the throttle valve, the gap between the valve core 116 and the first liquid passing wall 117 is adjusted by rotating the valve stem 103, so that the area of the throttling section changes; the valve core 116 is adjusted upward, and the gap increases; the valve core 116 is adjusted downward, and the gap decreases. When the valve core 116 is not in contact with the first liquid passing wall 117, the valve cylinder 115 has high rotational freedom, and the valve cylinder 115 arranged at the valve port can rotate. When the coal gas flowing from the medium inlet 107 impacts the valve cylinder 115, the valve cylinder 115 can rotate to alleviate the direct scouring of the coal gas on the valve core 116, thereby protecting the valve core 116. At the same time, if the coal gas carries impurities, the impurities first collide with the valve cylinder 115, and then enter the first liquid passing wall 117 to contact the valve core 116 inside, so that the wear of the valve core 116 by the coal gas is reduced, the valve core 116 is protected, and the stability of the performance of the throttle valve is ensured. The unstable operation of the traditional valve is optimized.

[0036] In this embodiment, a smooth section and a locking thread section are processed on the top of the valve stem 103. The smooth section is provided with a key groove, which constitutes a part connected with the rotating wheel 104. The rotating wheel 104 is sleeved on the smooth section and is fixed by the locking nut installed on the locking thread section.

[0037] In addition, the valve stem 103 can also be threadedly connected with the top of the valve cover 101. In this way, the valve stem 103 is driven to descend or ascend by rotating the valve stem 103 through the rotating wheel 104. When the valve core 116 descends, the gap between the outer surface of the valve core 116 and the inner surface of the first liquid passing wall 117 decreases, and even the valve core 116 is in contact with the first liquid passing wall 117. When the valve core 116 ascends, the gap between the outer surface of the valve core 116 and the inner surface of the first liquid passing wall 117 increases. In this way, the outer surface of the valve core 116 is coupled with the inner surface of the first liquid passing wall 117.

[0038] In this embodiment, as shown in FIG. 1, the valve core 116 is provided with a key groove 120, and the rotating wheel 104 is provided with a key 122. The key 122 is inserted into the key groove 120, so that the rotating wheel 104 is connected with the valve core 116. Figure 4As shown, according to actual needs, the threaded connection of the valve rod 103 and the valve cover 101 can also be configured as follows: a connecting bracket 102 is integrally arranged on the top of the valve cover 101, the valve rod nut cavity 109 is connected to the connecting bracket 102, and the valve rod nut threadedly connected to the valve rod 103 is arranged in position in the valve rod nut cavity 109. For example, the cross section of the valve rod nut cavity 109 is hexagonal, the valve rod nut can be clamped in the valve rod nut cavity 109, and then the valve rod nut can be axially limited by a cover plate, a snap ring or a limiting screw. The structure is compact, the limiting is reliable, and the practicability is high.

[0039] The connecting bracket 102 is formed with an operation gap (not shown in the figure), and the valve rod nut can be screwed by artificial through the operation gap. In this way, the travel range of the valve rod 103 driving the valve core 116 can be adjusted. In addition, the valve rod nut can be put into the valve rod nut cavity 109 from the operation gap and be limited by the valve rod nut cavity 109. When the valve rod 103 is rotated, the valve rod nut is limited in the valve rod nut cavity 109, and the valve rod nut does not displace in the axial direction of the valve rod 103. The rotation of the valve rod 103 is limited by the valve rod nut, and the valve rod 103 will descend or ascend, thereby driving the valve core 116 to descend or ascend, achieving the purpose of adjusting the gap, and changing the area of the throttling section.

[0040] In the embodiment, as shown in Figure 3 In order to ensure the sealing performance of the valve rod 103, a hollow threaded section 112 can be arranged on the top of the valve cover 101, the valve rod 103 passes through the middle of the threaded section 112, and a packing pad, a sealing packing 113 and a pressing sleeve 111 are sequentially arranged between the threaded section 112 and the valve rod 103 from bottom to top. The pressing sleeve 111 is fixedly connected to the pressing nut 110 of the threaded section 112 at the top by screwing. The pressure on the pressing sleeve 111 can be adjusted by screwing the pressing nut 110, thereby adjusting the density of the sealing packing 113, and ensuring the sealing performance.

[0041] In the embodiment, as shown in Figure 4 According to actual needs, the driving assembly can also be selected as an electric drive, that is, an electric actuator is installed on the connecting bracket 102, and the output end of the electric actuator is connected to the valve rod 103 for driving the valve rod 103 to rotate. The electric actuator includes but is not limited to a motor, a motor or a pneumatic motor, etc.

[0042] The valve cover in the embodiment is provided with a limiting sleeve 114 on the inner wall of the valve cover 101. The radial direction of the valve rod 103 can be limited by the limiting sleeve 114, and a certain sealing function is provided. In combination with the sealing function of the sealing packing 113, the valve body 100 can be fully sealed.

[0043] In Figure 5For example, in this embodiment, the valve cylinder 115 can be divided into an upper end and a lower end with the middle wall 121 as the boundary; the outer wall of the first end of the valve cylinder 115 is the upper outer wall, and the upper outer wall is provided with a medium inlet hole 119 in a circumferential array.

[0044] For example, such as Figure 5 As shown, an arc-shaped wall 120 is provided on the side of the intermediate wall 121 near the valve core 116. The arc-shaped wall 120 protrudes upward and supports the first liquid-passing wall 117, making the contact between the first liquid-passing wall 117 and the valve core 116 more compact. Simultaneously, the arc-shaped wall 120 can change the flow direction of the medium flowing in from the medium inlet 107. A through hole is provided in the middle of the arc-shaped wall 120, and the outer edge of the through hole connects to the bottom of the first liquid-passing wall 117. Figure 5 As shown, the bottom of the first liquid-passing wall 117 is through; while the top of the second liquid-passing wall 124 is closed.

[0045] For example, three helical ribs are provided on the top surface of the arc wall 120. The helical ribs and the arc wall 120 form a turbine structure, which can assist the rotation of the valve cylinder 115 under the drive of the medium. In addition, the medium inlet hole 119 can be machined at an angle, and there is an acute angle between the center of the medium inlet hole 119 and the radial line of the valve cylinder 115 (a constant value can be selected according to the actual situation, such as 85°). In this way, the medium passing through the medium inlet hole 119 has a tangential component force, which will also cause the valve cylinder 115 to rotate.

[0046] In fact, five spiral ribs or other odd-numbered spiral ribs can also be provided on the top surface of the arc wall 120 as needed.

[0047] In this embodiment, as Figures 5-7 As shown, the cross-sections of the first liquid-passing wall 117 and the second liquid-passing wall 124 inside the valve cylinder 115 are hourglass-shaped. Of course, the intermediate wall 121 can be omitted, and the medium flowing out of the first liquid-passing wall 117 directly enters the space between the lower end of the valve cylinder 115 and the second liquid-passing wall 124, and then flows out through the second liquid-passing hole 123. When the valve cylinder 115 is set up, the size, number and other specifications of the first liquid-passing hole 118 and the second liquid-passing hole 123 are consistent.

[0048] In the embodiment, in order to improve the stability of the valve cylinder 115, a step is processed in the inner wall of the lower end of the valve body 100, a cross plate 127 is installed at the bottom of the valve cylinder 115, the cross plate 127 is clamped on the step, a limiting hole is arranged in the middle of the cross plate 127, a spring 126 is arranged between the limiting hole and the second liquid passing wall 124, the bottom of the spring 126 abuts against and is limited in radial degree of freedom by the limiting hole, the top of the spring 126 is connected with a cross rod 125, and the two ends of the cross rod 125 are slidingly connected in the sliding groove arranged in the inside of the second liquid passing wall 124; the spring 126 can provide an elastic force for returning when the valve cylinder 115 is eccentric, improve the concentricity of the valve cylinder 115 and the valve core 116, and further ensure the stability of the valve cylinder 115.

[0049] The throttle valve provided by the embodiment can be contacted with the medium by the valve cylinder 115 first, so that the direct impact of the medium on the valve core 116 can be relieved and the valve core 116 is protected, the performance of the throttle valve is stable, and the unstable operation of the traditional valve is optimized. The pressure difference formed between the inside and outside of the medium inlet hole 119 can drive the valve cylinder 115 to rotate, the rotation of the valve cylinder 115 can change the direction of the fluid impacting the valve core 116, the impact of the high-pressure fluid on the valve core 116 can be reduced, and when the fluid carries impurities such as fixed particles, the valve cylinder 115 can collide with the fixed particles first, the wear of the valve core 116 can be slowed down, and the performance of the throttle valve is stable.

[0050] The throttle valve provided by the embodiment can be contacted with the medium by the valve cylinder 115 first, so that the direct impact of the medium on the valve core 116 can be relieved and the valve core 116 is protected, the performance of the throttle valve is stable, and the unstable operation of the traditional valve is optimized. The pressure difference formed between the inside and outside of the medium inlet hole 119 can drive the valve cylinder 115 to rotate, the rotation of the valve cylinder 115 can change the direction of the fluid impacting the valve core 116, the impact of the high-pressure fluid on the valve core 116 can be reduced, and when the fluid carries impurities such as fixed particles, the valve cylinder 115 can collide with the fixed particles first, the wear of the valve core 116 can be slowed down, and the performance of the throttle valve is stable.

[0050] The throttle valve provided by the embodiment can be contacted with the medium by the valve cylinder 115 first, so that the direct impact of the medium on the valve core 116 can be relieved and the valve core 116 is protected, the performance of the throttle valve is stable, and the unstable operation of the traditional valve is optimized. The pressure difference formed between the inside and outside of the medium inlet hole 119 can drive the valve cylinder 115 to rotate, the rotation of the valve cylinder 115 can change the direction of the fluid impacting the valve core 116, the impact of the high-pressure fluid on the valve core 116 can be reduced, and when the fluid carries impurities such as fixed particles, the valve cylinder 115 can collide with the fixed particles first, the wear of the valve core 116 can be slowed down, and the performance of the throttle valve is stable.

Claims

1. A throttling valve, comprising a valve body, a valve cover, and a valve stem, wherein the valve body has a medium inlet and a medium outlet, and the valve body has a valve port communicating with the medium inlet and the medium outlet, characterized in that, A valve cylinder is rotatably mounted inside the valve body at the valve port; one end of the valve stem extends into the valve body through the valve port away from the medium outlet and is connected to a valve core, and the other end of the valve stem is equipped with a drive assembly; a perforated intermediate wall is provided in the middle of the valve cylinder, and a medium inlet hole is arranged in a circumferential array on the outer wall of the first end of the valve cylinder, and a first liquid passage wall is provided on the inner wall of the first end of the valve cylinder, with a first liquid passage hole arranged in a circumferential array on the first liquid passage wall; a second liquid passage wall is provided on the inner wall of the second end of the valve cylinder, with a second liquid passage hole arranged in a circumferential array on the second liquid passage wall; the medium inlet hole, the first liquid passage hole, the perforated intermediate wall and the second liquid passage hole are connected to form a medium channel; the outer surface of the valve core is coupled to the inner surface of the first liquid passage wall to adjust the throttling cross section of the medium channel.

2. The throttle valve according to claim 1, characterized in that, The drive assembly includes at least a rotary wheel, which is mounted on the end of the valve stem away from the valve core.

3. The throttle valve according to claim 1 or 2, characterized in that, The valve cover has a hollow threaded section at its top, through which the valve stem passes. A packing gasket, a sealing packing, and a pressure sleeve are arranged sequentially from bottom to top between the threaded section and the valve stem. The top of the pressure sleeve is threadedly connected to a tightening sleeving on the threaded section for secure tightening. The valve cover is integrally provided with a connecting bracket, which is connected to a valve stem nut cavity. A valve stem nut that is threadedly connected to the valve stem is provided within the valve stem nut cavity for limiting its position.

4. The throttle valve according to claim 1, characterized in that, The middle wall has an arc-shaped wall on the side near the valve core, and the arc-shaped wall protrudes upward; a through hole is provided in the middle of the arc-shaped wall, and the outer edge of the through hole is connected to the bottom of the first liquid-passing wall.

5. The throttle valve according to claim 4, characterized in that, The top surface of the arc wall is provided with at least three spiral ribs.

6. The throttle valve according to claim 1, characterized in that, The cross-sections of the first and second liquid-passing walls inside the valve cylinder are hourglass-shaped.

7. The throttle valve according to claim 1, characterized in that, A cross plate is installed at the bottom of the valve cylinder, and a limit port is provided in the middle of the cross plate. A spring is provided between the limit port and the second liquid passage wall.

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