Micrometering valve

Abstract

According to the micrometering valve, when the valve is closed, the liquid inlet channel and the liquid outlet channel are separated, fluid cannot enter the adjusting cavity through the liquid inlet channel, and the mounting part and the conical part are driven to move by rotating the valve rod. When the conical part gradually extends into the liquid inlet channel, the sectional area of the channel is changed, so that the flow of the fluid is adjusted, and the adjusted fluid flows through the adjusting cavity and finally flows out through the liquid outlet channel. One end of the conical part is arranged on the mounting part, and the other end of the conical part is gradually reduced in the direction far away from the mounting part and close to the axis of the valve, so that accurate flow control can be realized, and the valve is particularly suitable for the field of fluid control with high-pressure and high-precision requirements. The fluid flow can be finely adjusted by rotating the valve rod, the fluid adjusting efficiency is improved, and the adjusting time is shortened.

Description

Technical Field

[0001] This application relates to the field of valves, and in particular, to a fine adjustment valve. Background Art

[0002] The function of a valve is to cut off or control the flow rate of a fluid passing through the valve, so as to regulate the amount of fluid flowing out of the valve.

[0003] For fields with relatively high fluid pressure and the need to control fluid precision at the same time, ordinary valves cannot achieve precise control. The existing method is to use a ball valve to precisely adjust the flow rate of the fluid. However, in the existing ball valve, since the valve presents a spherical surface with a large curvature change, when closing the valve and adjusting the flow rate of the fluid, due to the large curvature change of the spherical surface, the opening and closing angle of the spherical surface relative to the inside of the pipeline changes too much during the opening and closing process, resulting in difficulty in precisely adjusting the fluid flow rate during the control process, making the adjustment time of the fluid flow rate very long and the efficiency very low, and it is not convenient to be used in fields with relatively high fluid pressure and the need to control fluid precision. Utility Model Content

[0004] In view of this, it is necessary to provide a fine adjustment valve to solve the above problems.

[0005] An embodiment of this application provides a fine adjustment valve, including:

[0006] A valve body, which is provided with a liquid inlet channel, a liquid outlet channel and an adjustment cavity, and the adjustment cavity is respectively communicated with the liquid inlet channel and the liquid outlet channel;

[0007] A valve stem, one end of which is movably received in the adjustment cavity, and the other end penetrates through the valve body and extends to the outside, and the valve stem is threadedly connected to the valve body;

[0008] A valve, located in the adjustment cavity, the valve is provided with a mounting portion and a conical portion, the mounting portion is provided at one end of the valve stem, and one end of the conical portion is provided at the mounting portion, and the other end gradually shrinks in a direction away from the mounting portion and close to the axis of the valve;

[0009] Wherein, rotate the valve stem to adjust the penetration amount of the conical portion into the liquid inlet channel, so as to finely adjust the flow rate of the liquid inlet channel flowing through the adjustment cavity, and control the outflow amount of the fluid in the liquid outlet channel.

[0010] In at least one embodiment of this application, the liquid inlet channel includes:

[0011] A first communication channel, one end of which is communicated with an external fluid supply device;

[0012] A second communication channel, one end of which is communicated with the first communication channel, and the other end of which is communicated with the adjustment cavity;

[0013] The liquid outlet channel includes:

[0014] A third communication channel, with one end communicating with the outside;

[0015] A fourth communication channel, with one end communicating with the adjustment cavity and the other end communicating with the third communication channel;

[0016] The junction of the second communication channel and the adjustment cavity is denoted as the first position;

[0017] The junction of the fourth communication channel and the adjustment cavity is denoted as the second position;

[0018] The distance from the first position to the valve stem is denoted as a, and the distance from the second position to the valve stem is denoted as b, satisfying the relationship a > b.

[0019] In at least one embodiment of the present application, one end of the second communication channel communicates with the first communication channel, and the other end is inclined away from the valve stem to form;

[0020] The fourth communication channel has the same inclination direction as the second communication channel, and the axial direction of the valve stem is arranged vertically;

[0021] Wherein, when the fine adjustment valve is closed, the fluid in the fourth communication channel is completely discharged to the outside through the third communication channel.

[0022] In at least one embodiment of the present application, the valve body is further provided with an activity channel, the activity channel communicates with the adjustment cavity, and one end of the valve stem is received in the adjustment cavity, and the other end penetrates through the adjustment cavity and the activity channel and extends to the outside.

[0023] In at least one embodiment of the present application, the fine adjustment valve further includes:

[0024] A packing group, disposed in the activity channel and blocking the adjustment cavity along the axial direction of the activity channel to increase the sealing performance of the fine adjustment valve;

[0025] The valve stem penetrates through the packing group.

[0026] In at least one embodiment of the present application, the fine adjustment valve further includes:

[0027] A spring group, disposed in the activity channel and abutting against the side of the packing group away from the valve.

[0028] In at least one embodiment of the present application, there are two sets of the spring groups, each set of the spring groups includes two disc springs, and the two disc springs in each set of the spring groups are stacked in the opposite direction in the movable channel, and the axis of the disc spring is coaxially arranged with the axis of the movable channel.

[0029] In at least one embodiment of the present application, the fine adjustment valve further includes:

[0030] A packing nut, which is covered on the valve body, and along the axial direction of the movable channel, the packing nut blocks the movable channel.

[0031] In at least one embodiment of the present application, the packing group includes:

[0032] A lower packing gland, a lower packing, an upper packing, and an upper packing gland. The lower packing gland, the lower packing, the upper packing, and the upper packing gland are all located in the movable channel and are stacked in sequence along the axial direction of the movable channel. The valve stem sequentially penetrates through the lower packing gland, the lower packing, the upper packing, and the upper packing gland. One end of the spring group abuts against the upper packing gland, and the other end abuts against the packing nut.

[0033] In at least one embodiment of the present application, a threaded portion is provided on the valve body, and the packing nut is threadedly connected to the threaded portion;

[0034] The fine adjustment valve further includes:

[0035] A lock nut, and the threaded portion penetrates through the lock nut;

[0036] Wherein, by rotating the lock nut, the meshing area between the packing nut and the threaded portion is adjusted to adjust the pressure of the spring group.

[0037] Implementing the fine adjustment valve of this embodiment will at least have the following beneficial effects:

[0038] For the fine adjustment valve provided above, when the valve is closed, the liquid inlet channel is separated from the liquid outlet channel, and the fluid cannot enter the adjustment cavity through the liquid inlet channel. By rotating the valve stem, the installation portion and the conical portion are driven to move.

[0039] When the conical portion gradually extends into the liquid inlet channel, the cross-sectional area of the channel is changed, thereby adjusting the flow rate of the fluid. The adjusted fluid flows through the adjustment cavity and finally flows out through the liquid outlet channel.

[0040] Since one end of the conical portion is provided on the installation portion and the other end gradually tapers in a direction away from the installation portion and close to the axis of the valve, precise flow control can be achieved, which is especially suitable for the fluid control field with high pressure and high-precision requirements.

[0041] The rotating valve stem can finely adjust the fluid flow rate, improve the efficiency of fluid regulation, and reduce the regulation time. Brief Description of the Drawings

[0042] Figure 1 It is a schematic structural diagram of a fine-tuning valve in an embodiment;

[0043] Figure 2 is Figure 1 the exploded view of the fine-tuning valve in

[0044] Figure 3 is Figure 1 the cross-sectional view of the fine-tuning valve in

[0045] Figure 4 is Figure 1 the cross-sectional view of a partial structure of the fine-tuning valve in

[0046] Figure 5 is Figure 2 the schematic structural diagram of the valve in

[0047] Description of the Main Component Symbols

[0048] 100, fine-tuning valve;

[0049] 110, valve body; 110a, liquid inlet channel; 110b, liquid outlet channel; 110c, adjustment cavity; 110d, first communication channel; 110e, second communication channel; 110f, third communication channel; 110g, fourth communication channel; 110h, first position; 110i, second position; 110j, movable channel; 111, threaded part;

[0050] 120, valve stem;

[0051] 130, valve; 131, mounting part; 132, conical part;

[0052] 140, packing set; 141, lower packing gland; 142, lower packing; 143, upper packing; 144, upper packing gland;

[0053] 150, spring set; 151, disc spring;

[0054] 160, packing nut;

[0055] 170, lock nut. Detailed Embodiments

[0056] Next, the embodiments of the present application will be described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0057] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component present at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "rear", and similar expressions used herein are for illustrative purposes only.

[0058] The following will describe in detail some embodiments of the present application with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0059] An embodiment of the present application provides a fine-tuning valve 100, including:

[0060] A valve body 110 is provided with a liquid inlet channel 110a, a liquid outlet channel 110b, and an adjustment chamber 110c. The adjustment chamber 110c is respectively communicated with the liquid inlet channel 110a and the liquid outlet channel 110b;

[0061] A valve stem 120, one end of which is movably received in the adjustment chamber 110c, and the other end extends through the valve body 110 to the outside. The valve stem 120 is threadedly connected to the valve body 110;

[0062] A valve 130 is located in the adjustment chamber 110c. The valve 130 is provided with a mounting portion 131 and a tapered portion 132. The mounting portion 131 is disposed at one end of the valve stem 120. One end of the tapered portion 132 is disposed at the mounting portion 131, and the other end gradually narrows in a direction away from the mounting portion 131 and close to the axis of the valve 130;

[0063] Wherein, by rotating the valve stem 120, the insertion amount of the tapered portion 132 into the liquid inlet channel 110a is adjusted to finely adjust the flow rate of the liquid flowing through the adjustment chamber 110c in the liquid inlet channel 110a, so as to control the outflow amount of the fluid in the liquid outlet channel 110b.

[0064] Please refer to Figures 1 - 5 , in this embodiment, the valve 130 is closed to isolate the liquid inlet channel 110a from the liquid outlet channel 110b. The fluid cannot enter the adjustment chamber 110c through the liquid inlet channel 110a. By rotating the valve stem 120, the mounting portion 131 and the tapered portion 132 are driven to move.

[0065] When the tapered portion 132 gradually extends into the liquid inlet channel 110a, the cross-sectional area of the channel is changed, thereby adjusting the flow rate of the fluid. The adjusted fluid flows through the adjustment chamber 110c and finally flows out through the liquid outlet channel 110b.

[0066] Since one end of the tapered portion 132 is provided at the mounting portion 131 and the other end is formed to gradually narrow in a direction away from the mounting portion 131 and toward the axis of the valve 130, precise flow control can be achieved, especially suitable for the field of fluid control with high pressure and high-precision requirements.

[0067] The rotating valve stem 120 can finely adjust the fluid flow rate, improve the efficiency of fluid regulation, and reduce the adjustment time.

[0068] It should be noted that the tapered portion 132 is in the shape of a frustum of a cone. The tapered portion 132 extends from the mounting portion 131 and gradually narrows, and is used to finely adjust the fluid flow rate, and can more precisely control the fluid flow rate passing through the fine adjustment valve 100. At a fixed opening speed, there will be no situation where the fluid flow rate increases significantly during the adjustment process.

[0069] The outer shape of the mounting portion 131 is generally cylindrical, and the maximum diameter of the tapered portion 132 is equal to the diameter of the mounting portion 131. The diameter of the end of the tapered portion 132 away from the mounting portion 131 is smaller than the diameter of the mounting portion 131.

[0070] The valve stem 120 is a cylindrical rod, and a handle is provided at one end thereof away from the valve 130. Rotating the handle can drive the valve stem 120 to rotate relative to the valve body 110, so as to linearly move along the axis direction of the valve stem 120, and drive the valve 130 to move along the axis direction of the valve stem 120.

[0071] Both the liquid inlet channel 110a and the liquid outlet channel 110b are circular channels, and in other embodiments, they can be channels of other shapes.

[0072] In at least one embodiment of the present application, the liquid inlet channel 110a includes:

[0073] The first communication channel 110d, one end of which is communicated with an external fluid supply device;

[0074] The second communication channel 110e, one end of which is communicated with the first communication channel 110d, and the other end of which is communicated with the adjustment cavity 110c;

[0075] The liquid outlet channel 110b includes:

[0076] The third communication channel 110f, one end of which is communicated with the outside;

[0077] The fourth communication channel 110g, one end of which is communicated with the adjustment cavity 110c, and the other end of which is communicated with the third communication channel 110f;

[0078] The connection point of the second communication channel 110e and the adjustment cavity 110c is denoted as the first position 110h;

[0079] The junction of the fourth communication channel 110g and the adjustment cavity 110c is denoted as the second position 110i;

[0080] The distance from the first position 110h to the valve stem 120 is denoted as a, and the distance from the second position 110i to the valve stem 120 is denoted as b, satisfying the relationship a > b.

[0081] In at least one embodiment of the present application, one end of the second communication channel 110e is connected to the first communication channel 110d, and the other end is inclined away from the valve stem 120;

[0082] The fourth communication channel 110g has the same inclination direction as the second communication channel 110e, and the axial direction of the valve stem 120 is arranged in the vertical direction;

[0083] Wherein, when the fine adjustment valve 100 is closed, the fluid in the fourth communication channel 110g is completely discharged to the outside through the third communication channel 110f.

[0084] Please refer to Figures 1 - 5 , in this embodiment, the fluid enters the second communication channel 110e from an external fluid supply device through the first communication channel 110d, then flows into the adjustment cavity 110c, the valve stem 120 rotates, the depth of the conical portion 132 extending into the second communication channel 110e is adjusted, the flow rate of the fluid entering the adjustment cavity 110c is changed, the adjusted fluid enters the fourth communication channel 110g from the adjustment cavity 110c, and then is discharged to the outside through the third communication channel 110f. When the fine adjustment valve 100 is closed, it is ensured that the fluid in the fourth communication channel 110g is completely discharged to the outside through the third communication channel 110f, avoiding residual fluid in the valve.

[0085] When the fine adjustment valve 100 is closed, due to the same inclination direction of the fourth communication channel 110g and the second communication channel 110e, the distance from the first position 110h to the valve stem 120 is denoted as a, and the distance from the second position 110i to the valve stem 120 is denoted as b, satisfying the relationship a > b. The fluid in the fourth communication channel 110g can be completely discharged to the outside, avoiding residual fluid in the valve body 110 and improving the durability and reliability of the valve body 110.

[0086] It should be noted that the first position 110h is arranged close to the valve stem 120, and the distance from the second position 110i to the valve stem 120 is greater than the distance from the first position 110h to the valve stem 120, such that the first position 110h is higher than the second position 110i, and the second position 110i is inclined away from the valve stem 120 (inclined downward relative to the vertical direction, where the included angle between the fourth communication channel 110g and the axis of the valve stem 120 ranges from 10 to 85 degrees), so that when discharging liquid, the fine adjustment valve 100 is in a state of high inlet and low outlet, and further enables the liquid outlet channel 110b of the fine adjustment valve 100 to completely discharge the liquid.

[0087] The axes of the first communication channel 110d and the third communication channel 110f are both perpendicular to the axis of the valve stem 120.

[0088] The valve 130 is clamped to one end of the valve stem 120.

[0089] In at least one embodiment of the present application, the valve body 110 is further provided with a movable channel 110j, the movable channel 110j communicates with the adjustment cavity 110c, one end of the valve stem 120 is received in the adjustment cavity 110c, and the other end extends through the adjustment cavity 110c and the movable channel 110j to the outside.

[0090] Please refer to Figures 1 - 5 , in this embodiment, the fluid enters the adjustment cavity 110c through the liquid inlet channel 110a, the valve stem 120 rotates, and the position of the adjustment conical portion 132 in the liquid inlet channel 110a is adjusted through a threaded connection, so as to adjust the fluid flow rate entering the adjustment cavity 110c. The adjusted fluid flows out through the liquid outlet channel 110b. One end of the valve stem 120 is adjusted in the adjustment cavity 110c, and the other end extends to the outside through the movable channel 110j, which is convenient for operation.

[0091] The valve stem 120 passes through the adjustment cavity 110c and the movable channel 110j and extends to the outside, which is convenient for rotating the valve stem 120 to adjust the fluid flow rate.

[0092] The movable channel 110j can be used in cooperation with a sealing member (such as the packing set 140) to enhance the sealing performance of the fine adjustment valve 100, prevent fluid leakage, and improve the reliability of the valve 130.

[0093] The threaded connection between the valve stem 120 and the movable channel 110j enables the valve stem 120 to rotate along the movable channel 110j and enables the valve stem 120 to move along the axis of the movable channel 110j.

[0094] In at least one embodiment of the present application, the fine adjustment valve 100 further includes:

[0095] The packing group 140 is disposed within the movable channel 110j and blocks the adjustment cavity 110c along the axial direction of the movable channel 110j to increase the sealing performance of the fine adjustment valve 100;

[0096] The valve stem 120 penetrates through the packing group 140.

[0097] Please refer to Figures 1 - 5 , in this embodiment, the packing group 140 forms a seal within the movable channel 110j to prevent fluid from leaking from the adjustment cavity 110c to the movable channel 110j, and the valve stem 120 penetrates through the packing group 140 to achieve flow regulation in a sealed state.

[0098] The packing group 140 is disposed within the movable channel 110j, effectively closing the connection area between the adjustment cavity 110c and the movable channel 110j, preventing fluid leakage, and enhancing the sealing performance of the valve 130.

[0099] Through the sealing effect of the packing group 140, the reliability of the valve 130 in a high-pressure and high-precision fluid control environment is ensured, and failures caused by leakage are avoided.

[0100] In at least one embodiment of the present application, the fine adjustment valve 100 further includes:

[0101] A spring group 150 is disposed within the movable channel 110j and abuts against a side of the packing group 140 away from the valve 130.

[0102] In at least one embodiment of the present application, there are two spring groups 150. Each spring group 150 includes two disc springs 151. The two disc springs 151 in each spring group 150 are stacked in opposite directions within the movable channel 110j, and the axis of the disc spring 151 is coaxially arranged with the axis of the movable channel 110j.

[0103] Please refer to Figures 1 - 5 , in this embodiment, the two disc springs 151 in each spring group 150 are stacked in opposite directions within the movable channel 110j, and the axis of the disc spring 151 is coaxially arranged with the axis of the movable channel 110j. As the valve 130 and the packing group 140 are used, wear will cause an increase in the clearance. The spring group 150 automatically compensates for these clearances caused by wear by providing continuous pressure, ensuring that the packing group 140 always remains in close contact with the valve stem 120 and maintaining the sealing effect.

[0104] The spring group 150 provides continuous elastic force, automatically compensating for the clearances caused by wear, ensuring the close contact between the valve stem 120 and the packing group 140, maintaining the sealing property, and extending the service life of the valve 130.

[0105] The spring group 150 ensures the seal between the packing group 140 and the valve stem 120 by continuously applying pressure, preventing fluid leakage. Especially in applications with high pressure and high-precision requirements, the sealing performance is significantly improved.

[0106] The uniform pressure applied by the spring group 150 ensures the smooth movement of the valve stem 120 during operation, improving the accuracy of fluid regulation and being suitable for occasions of high-precision fluid control.

[0107] In one embodiment, the spring group 150 is a single group, and in another embodiment, the spring group 150 is multiple groups, such as two groups, three groups, four groups, etc.

[0108] In at least one embodiment of the present application, the fine-tuning valve 100 further includes:

[0109] A packing nut 160, covering the valve body 110. Along the axis direction of the movable channel 110j, the packing nut 160 shields the movable channel 110j.

[0110] In at least one embodiment of the present application, the packing group 140 includes:

[0111] A lower packing gland 141, a lower packing 142, an upper packing 143, and an upper packing gland 144. The lower packing gland 141, the lower packing 142, the upper packing 143, and the upper packing gland 144 are all located in the movable channel 110j and are stacked in sequence along the axis direction of the movable channel 110j. The valve stem 120 sequentially passes through the lower packing gland 141, the lower packing 142, the upper packing 143, and the upper packing gland 144. One end of the spring group 150 abuts against the upper packing gland 144, and the other end abuts against the packing nut 160.

[0112] Please refer to Figures 1 - 5 , in this embodiment, the packing group 140 is fixed in the movable channel 110j by the packing nut 160, and the packing nut 160 shields the movable channel 110j to prevent fluid leakage.

[0113] The spring group 150 provides continuous pressure to ensure the compression of the packing group 140, compensates for the gap caused by wear, and maintains the sealing performance.

[0114] The uniform pressure applied by the spring group 150 ensures the smooth movement of the valve stem 120 during operation, improving the accuracy of fluid regulation and being suitable for occasions of high-precision fluid control.

[0115] One end of the spring group 150 contacts the upper packing gland 144.

[0116] The other end of the spring group 150 contacts the packing nut 160 to provide elastic pressure.

[0117] The stable pressure of the spring group 150 ensures the smooth movement of the valve stem 120 during operation, improving the accuracy of fluid regulation.

[0118] In at least one embodiment of the present application, a threaded portion 111 is provided on the valve body 110, and the packing nut 160 is threadedly connected to the threaded portion 111;

[0119] The fine-tuning valve 100 further includes:

[0120] A lock nut 170, and the threaded portion 111 passes through the lock nut 170;

[0121] Wherein, by rotating the lock nut 170, the meshing area between the packing nut 160 and the threaded portion 111 is adjusted to adjust the pressure of the spring group 150.

[0122] Please refer to Figures 1 - 5 , in this embodiment, the packing nut 160 is connected to the valve body 110 through the threaded portion 111 to fix the packing group 140.

[0123] Rotate the lock nut 170 to adjust the meshing area between the packing nut 160 and the threaded portion 111.

[0124] As the position of the packing nut 160 is adjusted, the compression degree of the packing group 140 is changed, thereby adjusting the pressure exerted by the spring group 150 on the packing group 140, compensating for the gap caused by wear, and maintaining the sealing performance and operation stability of the valve 130.

[0125] The lock nut 170 is installed on the threaded portion 111, and the threaded portion 111 passes through the lock nut 170. By rotating the lock nut 170, the meshing area between the packing nut 160 and the threaded portion 111 is adjusted, thereby adjusting the pressure of the spring group 150.

[0126] By adjusting the rotation of the lock nut 170, the packing nut 160 can precisely control the compression degree of the packing group 140, ensuring the efficient sealing of the valve 130 and preventing fluid leakage.

[0127] By adjusting the lock nut 170, the position of the packing nut 160 can be adjusted at any time to compensate for the wear gap caused by long-term use, and extend the service life of the packing group 140 and the valve stem 120.

[0128] Precisely adjusting the compression degree of the packing group 140 makes the friction force of the valve stem 120 uniform and stable during operation, improving the accuracy of fluid regulation, and is particularly suitable for application scenarios with high-precision fluid control.

[0129] The above are only the embodiments of the present application. It should be noted here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present application, but these all fall within the protection scope of the present application.

Claims

1. A fine-tuning valve, characterized in that: include: The valve body is provided with a liquid inlet channel, a liquid outlet channel and a regulating chamber, wherein the regulating chamber is respectively connected with the liquid inlet channel and the liquid outlet channel; A valve stem, one end of which is movably accommodated in the regulating cavity, and the other end of which passes through the valve body and extends to the outside, and the valve stem is threadedly connected to the valve body; A valve is located in the regulating cavity, the valve is provided with a mounting portion and a tapered portion, the mounting portion is provided at one end of the valve stem, one end of the tapered portion is provided at the mounting portion, and the other end is gradually reduced in a direction away from the mounting portion and close to the valve axis; The valve stem is rotated to adjust the extension amount of the conical portion into the liquid inlet channel, so as to fine-tune the flow rate of the liquid inlet channel flowing through the regulating chamber, so as to control the outflow amount of the fluid in the liquid outlet channel.

2. The fine-tuning valve according to claim 1, characterized in that: The liquid inlet channel comprises: A first communication channel, one end of which is connected to an external fluid supply device; a second communication channel, one end of which is communicated with the first communication channel, and the other end of which is communicated with the regulating chamber; The liquid outlet channel comprises: A third communication channel, one end of which is connected to the outside; a fourth communication channel, one end of which is connected to the regulating chamber, and the other end of which is connected to the third communication channel; The junction between the second communication channel and the regulating chamber is recorded as the first position; The junction between the fourth communication channel and the regulating chamber is recorded as the second position; The distance from the first position to the valve stem is recorded as a, and the distance from the second position to the valve stem is recorded as b, satisfying the relationship a>b.

3. The fine-tuning valve according to claim 2, characterized in that: One end of the second communication channel is connected to the first communication channel, and the other end is inclined in a direction away from the valve stem; The fourth communication channel has the same inclination direction as the second communication channel, and the axis direction of the valve stem is arranged along the vertical direction; When the fine-tuning valve is closed, the fluid in the fourth communication channel is completely discharged to the outside through the third communication channel.

4. The fine-tuning valve according to claim 1, characterized in that: The valve body is further provided with a movable channel, which is communicated with the regulating cavity. One end of the valve stem is accommodated in the regulating cavity, and the other end thereof passes through the regulating cavity and the movable channel and extends to the outside.

5. The fine-tuning valve according to claim 4, characterized in that: The fine-tuning valve also includes: A packing group is arranged in the movable channel and shields the regulating cavity along the axial direction of the movable channel to increase the sealing performance of the fine-tuning valve; The valve stem passes through the packing set.

6. The fine-tuning valve according to claim 5, characterized in that: The fine-tuning valve also includes: The spring group is arranged in the movable channel and abuts against a side of the packing group away from the valve.

7. The fine-tuning valve according to claim 6, characterized in that: There are two groups of spring groups, each of which includes two disc springs. The two disc springs in each group of spring groups are stacked in reverse in the movable channel, and the axis of the disc spring is coaxially arranged with the axis of the movable channel.

8. The fine-tuning valve according to claim 6, characterized in that: The fine-tuning valve also includes: A packing nut is covered on the valve body, and along the axial direction of the movable channel, the packing nut blocks the movable channel.

9. The fine-tuning valve according to claim 8, characterized in that: The packing group comprises: The lower packing pressure ring, the lower packing, the upper packing and the upper packing pressure ring are all located in the movable channel and are stacked in sequence along the axial direction of the movable channel. The valve stem passes through the lower packing pressure ring, the lower packing, the upper packing and the upper packing pressure ring in sequence. One end of the spring group abuts against the upper packing pressure ring, and the other end abuts against the packing nut.

10. The fine-tuning valve according to claim 8, characterized in that: The valve body is provided with a threaded portion, and the packing nut is threadedly connected to the threaded portion; The fine-tuning valve also includes: A locking nut, wherein the threaded portion passes through the locking nut; The locking nut is rotated to adjust the meshing area between the packing nut and the threaded portion, so as to adjust the pressure of the spring assembly.

Images