Stop valve for fluid control and working method thereof

Abstract

The invention discloses a stop valve for fluid control and a working method of the stop valve, solves the problem that in the prior art, due to the fact that a valve rod and a valve element are not aligned, the opening and closing function is prone to failure, and has the beneficial effects that the stop valve for fluid control comprises a valve body, and the valve body forms a fluid opening and closing channel; the valve body is connected with the middle valve cover in a sealed mode, the middle valve cover is connected with the upper valve cover in a sealed mode, a driving piece is arranged at the position of the upper valve cover, the driving piece can rotate relative to the upper valve cover, the driving piece is connected with the valve rod through a thread structure, and the valve rod sequentially penetrates through the upper valve cover, the middle valve cover and the valve body and then is connected with the valve element. One section of the valve rod is in sliding connection with the upper valve deck or the middle valve deck to limit rotation of the valve rod along with the driving piece, so that the valve rod drives the valve element to move relative to the valve body in the axis direction of the valve body, and opening or closing of the opening and closing channel is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a stop valve for fluid control and a working method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The stop valve is a typical product that has extremely high requirements for high pressure, high temperature and sealing performance. It has high design standards, high production difficulty, multiple specifications and complex structure. The stop valves currently required for production are prone to leakage under high pressure, and the seals are prone to failure under high temperature, and the quality is difficult to guarantee. With the development of high-end industries, in the power, petroleum, chemical and other industries, the demand for various caliber stop valves that can withstand high temperature and high pressure is increasing. There is an urgent need for valves that are not easily sealed under high temperature and high pressure conditions to promote the development of my country's industry.

[0004] Traditional high-temperature and high-pressure stop valves usually have a two-section structure, with the upper section being the valve cover and the lower section being the valve body. The valve stem is sealed with packing, and a gasket is set between the valve cover and the valve body for sealing. The valve stem is rotated to open or close the valve core and the valve seat (the valve core and valve seat are integrated). During the opening and closing process of the valve, the valve stem rotates while moving up and down. During the opening and closing process, the valve stem and the valve core are easily misaligned, resulting in the opening and closing function of the stop valve failing. In addition, the valve stem in the valve body structure generates shear force on the sealing material during rotation, which can easily damage the seal, thereby affecting the normal use of the stop valve.

[0005] Moreover, the conventional stop valve has no structure to limit the rotational movement of the valve stem, so that the valve stem moves up and down as well as rotates, which affects the sealing performance of the seal. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide a stop valve for fluid control, which ensures the centering of the valve stem and the valve core and ensures the normal use of the stop valve.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A stop valve for fluid control comprises a valve body, which is provided with an opening and closing channel for the fluid. The valve body is sealed with a middle valve cover, which is sealed with an upper valve cover. A driving member is provided at the upper valve cover, which can rotate relative to the upper valve cover. The driving member is connected to a valve stem through a threaded structure. The valve stem passes through the upper valve cover, the middle valve cover and the valve body in sequence and is connected to a valve core. The valve core is located at the opening and closing channel. One section of the valve stem is slidably connected with the upper valve cover or the middle valve cover to limit the rotation of the valve stem with the driving member, so that the valve stem drives the valve core to move relative to the valve body along the axial direction of the valve body to realize the opening or closing of the opening and closing channel.

[0009] In the fluid control stop valve as described above, the valve stem and the upper valve cover are slidably connected via a rectangular structure, and the two cooperate through the rectangular structure to limit the valve stem from following the rotation of the driving member, ensuring that the valve stem only moves along the axial direction of the valve body.

[0010] In a fluid control stop valve as described above, the end of the valve stem away from the driving member is engaged with the valve core, which is convenient for the installation of the valve stem and the valve core. During the movement of the valve stem, the valve core follows the valve stem for linear motion and will not separate from the valve stem, thereby ensuring the centration of the two.

[0011] A fluid control stop valve as described above, the valve stem includes a first section, a second section and a third section connected in sequence, the first section is a cylindrical section, the second section is a rectangular structure, the third section is connected to the driving member, a first convex portion is provided at one end of the first section for connecting to the valve core, at least two claws are provided on one side of the valve core, the claws form a T-slot, and the T-slot is adapted to the first convex portion to realize the connection between the valve core and the valve stem.

[0012] A fluid control stop valve as described above, the valve core includes a sealing column, the claw is arranged on one side of the sealing column, the side of the sealing column away from the claw is tapered to improve the sealing performance, and a supporting claw is arranged on the other side of the sealing column relative to the claw to play a guiding and limiting role when the valve core is opened and closed, and the radius of the supporting claw is less than or equal to the minimum radius of the support column.

[0013] In the stop valve for fluid control as described above, the first section of the valve stem is further provided with a second convex portion, the outer diameter of the second convex portion is larger than the inner diameter of the through hole of the middle valve cover, so as to limit the movement of the valve stem;

[0014] The third section is a threaded rod, the outer diameter of the third section is smaller than the outer diameter of the second section, the outer diameter of the first section is larger than the side length of the second section, and the adjacent two sides of the second section are connected by arc transition.

[0015] In the stop valve for fluid control as described above, the first section of the valve stem is further provided with a third protrusion, the outer diameter of the third protrusion is less than or equal to the inner diameter of the through hole of the middle valve cover, the valve stem is circumferentially sleeved with an elastic sealing spacer, the cross-section of the elastic sealing spacer is T-shaped, one side of the elastic sealing spacer is sealingly arranged between the upper valve cover and the middle valve cover, the upper valve cover and the middle valve cover are tightly connected, the length of the elastic sealing spacer is less than the length from the third protrusion to the connection between the first section and the second section, and the thickness of the outer ring of the elastic sealing spacer away from the valve stem is greater than the thickness of the inner ring.

[0016] A fluid control stop valve as described above, wherein the driving member includes a fourth section, a fifth section and a sixth section connected in sequence, the fourth section is a cylindrical section, a support seat is annularly arranged on the bottom side of the fourth section, rolling bearings are arranged on both sides of the support seat to facilitate the rotation of the driving member relative to the upper valve cover, the fifth section is engaged and connected with the hand wheel, and the sixth section is connected with the locking nut.

[0017] A stop valve for fluid control as described above, wherein the longitudinal section of the middle valve cover is an I-shape, a sealing gasket is provided between the middle valve cover and the valve body, and the middle valve cover and the valve body are tightly connected;

[0018] The upper valve cover is provided with a groove to install the driving member, the driving member is arranged in the groove of the upper valve cover, the driving sleeve is circumferentially sleeved on the driving member, one side of the driving sleeve is inserted into the groove of the upper valve cover and is fastened to the upper valve cover, the driving member is provided with a threaded hole connected to the valve stem, and the length of the threaded hole is greater than the length of the third section of the valve stem.

[0019] In a second aspect, the present invention further provides a working method of a stop valve for fluid control, comprising the following contents:

[0020] The valve stem is connected to the valve core;

[0021] Insert the valve core into the valve body, and the valve body and the middle valve cover are sealed and connected;

[0022] The valve stem is connected to the driving member through a threaded structure, an upper valve cover is arranged in the circumferential direction of the driving member, the upper valve cover is sealed and connected to the middle valve cover, one section of the valve stem is slidably connected to the middle valve cover or one section of the valve stem is slidably connected to the upper valve cover;

[0023] The driving member is rotated, because one section of the valve stem is slidably connected with the upper valve cover or the middle valve cover to limit the rotation of the valve stem with the driving member, so that the valve stem drives the valve core to move relative to the valve body along the axial direction of the valve body to realize the opening or closing of the opening and closing channel.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1) The present invention provides a rotatable driving member, which is connected to the valve stem through a threaded structure, and the valve stem is slidably connected to the upper valve cover or the middle valve cover, so that during the rotation of the driving member, the valve stem is restricted to rotate along with the driving member, so that the valve stem can only perform linear motion relative to the axial direction of the valve body, ensuring that the valve core and the valve stem always maintain centering performance during the opening and closing process, and ensuring the smooth opening or closing of the opening and closing channel; and the valve stem only performs linear motion, so that the seal used in the stop valve is only subjected to tensile and compressive stress, avoiding the shear force on the sealing material caused by the rotation of the valve stem, and improving the service life of the stop valve; the entirety includes the upper valve cover, the middle valve cover and the valve body, which facilitates the installation of the valve core and the valve stem, and also ensures the smooth connection of the valve stem and the driving member. At the same time, the sealing connection between the sections makes the whole suitable for use in high temperature and high pressure environments.

[0026] 2) In the present invention, the valve stem and the valve core are connected by snap-fitting, specifically by snap-fitting with the first convex portion, which not only facilitates the installation of the valve core and the valve stem, but also the valve core follows the movement of the valve stem in a linear motion and will not separate from the valve stem, thereby ensuring the concentricity of the two. The valve core is provided with a supporting claw, which plays a guiding and limiting role. In this way, the valve core will not deflect even under the impact of the fluid. When the valve core and the valve body are opened and closed, the valve core always closes the opening and closing channel in the center, thereby ensuring the sealing performance of the valve core and the valve body. The valve stem is provided with a second convex portion to effectively limit the movement of the valve stem, so that the valve core always works in the guide channel of the valve body, thereby ensuring the stability of the structural setting.

[0027] 3) The valve stem structure of the present invention is reasonably arranged. The third convex portion is arranged on the first section of the valve stem, and the third convex portion is used to limit the elastic sealing spacer. The elastic sealing spacer effectively seals between the upper valve cover and the middle valve cover to ensure the sealing connection performance between the upper valve cover and the middle valve cover. The elastic sealing spacer is T-shaped to ensure the sealing between the middle valve cover and the upper valve cover during the movement of the valve stem relative to the middle valve cover.

[0028] 4) The driving member structure in the present invention is reasonably arranged, the driving member is assembled with the upper valve cover through the driving cover, the driving member is rotatable relative to the upper valve cover, the driving cover is connected to the top of the upper valve cover, and the driving member is provided with a threaded hole connected to the valve body to ensure the linear movement space of the valve stem relative to the driving member. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Figure 1 is a cross-sectional view of a fluid control stop valve according to one or more embodiments of the present invention.

[0031] Figure 2Schematic diagram of a stop valve for fluid control according to one or more embodiments of the present invention.

[0032] Figure 3 It is a schematic diagram of a valve stem and a valve core in a stop valve for fluid control according to one or more embodiments of the present invention.

[0033] Figure 4 It is a schematic diagram of a valve stem in a stop valve for fluid control according to one or more embodiments of the present invention.

[0034] Figure 5 It is a schematic diagram of a valve core in a stop valve for fluid control according to one or more embodiments of the present invention.

[0035] Figure 6 It is a schematic diagram of a driving component in a fluid control stop valve according to one or more embodiments of the present invention.

[0036] Figure 7 It is a schematic diagram of an upper valve cover in a stop valve for fluid control according to one or more embodiments of the present invention.

[0037] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0038] Among them: 1. hand wheel; 2. bolt; 3. drive sleeve; 4. upper valve cover; 5. thrust ball bearing; 6. elastic sealing sleeve; 7. middle valve cover; 8. sealing gasket; 9. valve body; 10. valve core; 11. valve stem; 12. driving parts;

[0039] 4-1. Round hole, 4-2. Square hole, 4-3. Sealing groove;

[0040] 9-1. Inlet flow channel, 9-2. Connecting seat, 9-3. Outlet flow channel;

[0041] 10-1. Claw, 10-2. Sealing column, 10-3. Conical surface, 10-4. Support claw;

[0042] 11-1. The first section, 11-2. The second section, 11-3. The third section, 11-4. The first convex part, 11-5. The second convex part, 11-6. The third convex part;

[0043] 12-1. The sixth section, 12-2. The fifth section, 12-3. The fourth section, 12-4. The support seat. DETAILED DESCRIPTION

[0044] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0046] As introduced in the background technology, the stop valve in the prior art has the problem of misalignment between the valve stem and the valve core. In order to solve the above technical problem, the present invention proposes a stop valve for fluid control.

[0047] Embodiment 1

[0048] In a typical embodiment of the present invention, reference is made to Figure 1 and Figure 2 As shown, a stop valve for fluid control includes a valve body 9, a middle valve cover 7, an upper valve cover 4 and a handwheel 1. The valve body 9 is provided with an opening and closing channel for the fluid. The valve body 9 is sealedly connected to the middle valve cover 4, and the middle valve cover 7 is sealedly connected to the upper valve cover 4. A driving member 12 is provided at the upper valve cover, and the driving member 12 can rotate relative to the upper valve cover 4. The driving member 12 is connected to the valve stem through a threaded structure. The valve stem 11 passes through the upper valve cover 4, the middle valve cover 7 and the valve body 9 in sequence and is connected to the valve core 10. The valve core 10 is located at the opening and closing channel. One section of the valve stem 11 is slidably connected to the upper valve cover or the middle valve cover to limit the rotation of the valve stem with the driving member, so that the valve stem drives the valve core to move relative to the valve body along the axial direction of the valve body to realize the opening or closing of the opening and closing channel.

[0049] In this embodiment, the valve stem 11 and the upper valve cover 4 are slidably connected through a rectangular structure, and the two cooperate with each other to limit the valve stem from following the rotation of the driving member, ensuring that the valve stem only moves along the axial direction of the valve body.

[0050] It should be noted that the end of the valve stem 11 away from the driving member 12 is engaged with the valve core 10 to facilitate the installation of the valve stem and the valve core. During the movement of the valve stem 11, the valve core follows the valve stem and moves in a straight line without being separated from the valve stem, thereby ensuring the centering of the two.

[0051] refer to Figure 3 and Figure 4As shown, the valve stem 11 includes a first section 11-1, a second section 11-2 and a third section 11-3 which are connected in sequence, the first section 11-1 is a cylindrical section, the length of the second section 11-2 is less than the length of the third section, the second section 11-2 is a rectangular structure, and the adjacent two sides of the second section are transitionally connected by arcs. Correspondingly, the structure of the upper valve cover 4 used for cooperating with the second section is adapted to the shape of the second section, limiting the valve stem to only realize linear motion relative to the valve body and not rotation; the third section 11-3 is connected to the driving member, the third section 11-3 of the valve stem 11 is a threaded rod, the outer diameter of the third section 11-3 is less than the outer diameter of the second section, and the outer diameter of the first section is greater than the side length of the second section.

[0052] The first section is provided with a first protrusion 11-4 at one end for connecting with the valve core 10. The first protrusion 11-4 may be a first boss. The first boss is an annular boss. At least two claws are provided on one side of the valve core. The claws form a T-slot. The T-slot is adapted to the first protrusion to realize the connection between the valve core and the valve stem. The T-slot is provided on the valve core to facilitate the claw to engage and connect with the first protrusion from one end of the valve stem.

[0053] The first section of the valve stem 11 is further provided with a second convex portion 11-5, which is arranged close to the first convex portion, and the second convex portion is a second boss, which is an annular boss, and the outer diameter of the second convex portion is larger than the inner diameter of the through hole of the middle valve cover, so as to limit the movement of the valve stem;

[0054] It is easy to understand that the first section of the valve stem 11 is also provided with a third convex portion 11-6, the distance between the second convex portion and the third convex portion 11-6 is greater than the distance between the second convex portion and the first convex portion, the third convex portion is a third boss, the third boss is an annular boss, the outer diameter of the third convex portion is less than or equal to the inner diameter of the through hole of the middle valve cover, the valve stem 11 is circumferentially sleeved with an elastic sealing sleeve 6, the cross-section of the elastic sealing sleeve 6 is T-shaped, and it has both axial sealing and radial sealing functions, one side of the elastic sealing sleeve 6 is sealed and arranged between the upper valve cover 4 and the middle valve cover 7, the upper valve cover 4 and the middle valve cover 7 are tightly connected, the length of the elastic sealing sleeve 6 is less than the length from the third convex portion to the connection between the first section and the second section, the thickness of the outer ring of the elastic sealing sleeve 6 away from the valve stem is greater than the thickness of the inner ring, so that the upper valve cover and the middle valve cover are provided with a sealing groove at the connection between the two for the installation of the shorter side of the elastic sealing sleeve, and the longer side of the elastic sealing sleeve 6 is located in the circumferential direction of the first section of the valve stem;

[0055] In some examples, the elastic sealing sleeve 6 is made of rubber material, and the valve stem 11 and the elastic sealing sleeve 6 are covered on the circumference of the first section of the valve stem by a rubber encapsulation process, and the first section protrudes from the elastic sealing sleeve.

[0056] refer to Figure 5As shown, the valve core 10 includes a sealing column 10-2, and a claw 10-1 is arranged on one side of the sealing column 10-2, specifically including two claws 10-1 arranged opposite to each other, and the side of the sealing column 10-2 away from the claw 10-1 is a conical surface 10-3 to improve the sealing performance, and a supporting claw 10-4 is arranged on the other side of the sealing column 10-2 relative to the claw 10-1 to play a guiding and limiting role when the valve core is opened and closed, and the supporting claw is located in the radial direction of the supporting column, and the radius of the supporting claw is less than or equal to the minimum radius of the support column.

[0057] In this embodiment, four supporting claws 10-4 are arranged on the side of the sealing column 10-2 away from the valve stem, and the interval between two adjacent supporting claws is 90°. The four supporting claws 10-4 are fixedly connected at the center point of the sealing column, and the thickness of the supporting claw 10-4 close to the center point of the sealing column is less than the thickness of the supporting claw 10-4 away from the center point of the sealing column; and the side of the supporting claw close to the sealing column is notched to avoid affecting the sealing performance of the sealing column.

[0058] refer to Figure 6 As shown, the driving member 12 includes a fourth section 12-3, a fifth section 12-2 and a sixth section 12-1 which are connected in sequence, the fourth section 12-3 is a cylindrical section, a support seat 12-4 is annularly arranged on the bottom side of the fourth section, the support seat is a truncated cone structure, the diameter of the fourth section 12-3 is greater than the side length of the fifth section 12-2, rolling bearings are arranged on both sides of the support seat to facilitate the rotation of the driving member relative to the upper valve cover, the fifth section is engaged with the hand wheel, the sixth section 12-1 is a screw rod, and the sixth rod 12-1 is used for connection with the locking nut.

[0059] In this embodiment, the driving member 12 is specifically a driving nut. The handwheel 1 and the driving nut are fastened together by a threaded structure. A square hole is arranged at the center of the handwheel 1. The shape of the fifth section of the driving member matches the shape of the square hole. The fifth section of the driving member is inserted into the square hole of the handwheel 1. After the sixth section exceeds the handwheel 1, it is locked by a locking nut.

[0060] Specifically, the rolling bearing is a thrust ball bearing 5, and two thrust ball bearings 5 ​​are respectively arranged above and below the support seat to ensure that the drive nut rotates smoothly relative to the upper valve cover. The drive sleeve 3 is tightened on the upper valve cover 4 through several bolts 2. The forward and reverse rotation of the handwheel drives the valve stem 11 and the valve core 10 to make a linear reciprocating motion to realize the opening and closing function of the valve.

[0061] The valve body 9 is columnar on both sides and elliptical in the middle. A connecting seat 9-2 is arranged in the middle of the valve body 9. An opening and closing channel is arranged on the connecting seat. The valve core can close the opening and closing channel. The inlet flow channel 9-1 of the valve body is a through structure from circular to elliptical, and the outlet flow channel 9-3 is a through structure from elliptical to circular. The inlet flow channel and the outlet flow channel are connected through the opening and closing channel. The two ends of the valve body are welded to the pipeline by butt welding. The valve body is provided with a valve stem moving channel, and the valve stem moving channel is connected to the outlet flow channel. The inner diameter of the valve stem moving channel is larger than the outer diameter of the first section of the valve stem. There is a flange structure above the valve body, which is connected to the middle valve cover by bolts and nuts. The valve body flange is provided with a concave groove for placing a sealing gasket 8. The inner diameter of the sealing gasket 8 is larger than the inner diameter of the valve stem moving channel.

[0062] It should be noted that the longitudinal cross-section of the middle valve cover 7 is an I-shape, the upper side of the middle valve cover 7 is an upper flange, and the lower side is a lower flange. The outer diameter of the upper flange of the middle valve cover is smaller than the outer diameter of the lower flange. The upper flange of the middle valve cover is provided with a sealing groove for placing an elastic sealing spacer 6. The middle valve cover is provided with a through hole, and the inner diameter of the through hole is larger than the outer diameter of the valve stem, and the inner diameter of the through hole is matched with the outer diameter of the elastic sealing spacer; a flange is provided at the bottom of the lower flange of the middle valve cover for compressing the sealing gasket 8, and the sealing gasket 8 is a graphite gasket.

[0063] Regarding the upper valve cover, the upper valve cover 4 is provided with a groove for installing the driving member, the driving member 12 is arranged in the groove of the upper valve cover, the driving sleeve 3 is circumferentially sleeved on the driving member 12, one side of the driving sleeve 3 is inserted into the groove of the upper valve cover and is fastened to the upper valve cover, and the driving member 12 is provided with a threaded hole connected to the valve stem 11, and the length of the threaded hole is greater than the length of the third section of the valve stem.

[0064] refer to Figure 7 As shown, the upper valve cover 4 is in an inverted T shape, and a groove, a square hole 4-2 and a circular groove 4-1 are sequentially arranged in the center of the upper valve cover 4. The cross-section of the groove is circular, and the square hole 4-2 is in the middle. The groove and the circular groove 4-1 are both penetrated by the square hole 4-2. A sealing groove 4-3 is opened at the bottom of the upper valve cover to set one side of the elastic sealing spacer 6. The sealing groove 4-3 is communicated with the circular groove 4-1, and the inner diameter of the sealing groove is larger than the inner diameter of the circular groove 4-1. The flange on the middle valve cover is fixedly connected to the bottom of the upper valve cover by bolts to compress the elastic sealing spacer 6.

[0065] In this embodiment, the cross-section of the driving sleeve 6 is T-shaped, and the driving sleeve 6 is a flange. The flange is fixedly connected to the upper valve cover by bolts. A protruding section is provided on one side of the flange. The protruding section extends into the groove of the upper valve cover and abuts against the thrust ball bearing 5 to tighten the thrust ball bearing 5.

[0066] The stop valve provided in this embodiment limits the valve stem from rotating along with the driving member during the rotation of the driving member, so that the valve stem can only perform linear motion relative to the axial direction of the valve body, thereby ensuring that the valve core and the valve stem always maintain centering performance during the opening and closing process, and ensuring the smooth opening or closing of the opening and closing channel; and the valve stem only performs linear motion, so that the sealing member used in the stop valve is only subjected to tensile and compressive stresses, thereby avoiding the shear force on the sealing material caused by the rotation of the valve stem, and improving the service life of the stop valve; the entire stop valve includes an upper valve cover, a middle valve cover and a valve body, which facilitates the installation of the valve core and the valve stem, and also ensures the smooth connection of the valve stem and the driving member. At the same time, the sealing connection between each section makes the whole suitable for use in a high temperature and high pressure environment.

[0067] In a second aspect, the present invention further provides a working method of a stop valve for fluid control, comprising the following contents:

[0068] The valve stem is connected to the valve core;

[0069] Insert the valve core into the valve body, and the valve body and the middle valve cover are sealed and connected;

[0070] The valve stem is connected to the driving member through a threaded structure, an upper valve cover is arranged in the circumferential direction of the driving member, the upper valve cover is sealed and connected to the middle valve cover, one section of the valve stem is slidably connected to the middle valve cover or one section of the valve stem is slidably connected to the upper valve cover;

[0071] The valve body 9 and the middle valve cover 7, the middle valve cover 7 and the upper valve cover 4 are fastened by bolts respectively, and the elastic sealing sleeve 6 is pressed by the upper valve cover 4 and the middle valve cover 7 in the sealing groove to achieve the purpose of axial and radial sealing;

[0072] The driving member is rotated, because one section of the valve stem is slidably connected with the upper valve cover or the middle valve cover to limit the rotation of the valve stem with the driving member, so that the valve stem drives the valve core to move relative to the valve body along the axial direction of the valve body to realize the opening or closing of the opening and closing channel.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stop valve for fluid control, characterized in that: The closure of the valve body is controlled by the valve stem, and the closure of the valve body is controlled by the valve core. The closure of the valve body is controlled by the valve stem, and the closure of the valve body is controlled by the valve core. The closure of the valve body is controlled by the valve stem, and the closure of the valve body is controlled by the valve core. The closure of the valve body is controlled by the valve stem, and the closure of the valve body is controlled by the valve core. The closure of the valve body is controlled by the valve stem, and the closure of the valve body is controlled by the valve core. The closure of the valve body is controlled by the valve stem, and the closure of the valve body is controlled by the valve core.

2. A stop valve for fluid control according to claim 1, characterized in that: The valve stem and the upper valve cover are slidably connected via a rectangular structure.

3. A stop valve for fluid control according to claim 1, characterized in that: One end of the valve stem away from the driving member is clamped and connected to the valve core.

4. A stop valve for fluid control according to claim 1, characterized in that: The valve stem includes a first section, a second section and a third section which are connected in sequence, the first section is a cylindrical section, the second section is a rectangular structure, the third section is connected to the driving member, a first convex portion is arranged at one end of the first section which is used for connecting to the valve core, at least two claws are arranged on one side of the valve core, the claws form a T-slot, and the T-slot is adapted to the first convex portion to realize the connection between the valve core and the valve stem.

5. A stop valve for fluid control according to claim 4, characterized in that: The valve core includes a sealing column, and the claw is arranged on one side of the sealing column. The side of the sealing column away from the claw is tapered to improve the sealing performance. A supporting claw is arranged on the other side of the sealing column relative to the claw to play a guiding and limiting role when the valve core is opened and closed, and the radius of the supporting claw is less than or equal to the minimum radius of the support column.

6. A stop valve for fluid control according to claim 4, characterized in that: The first section of the valve stem is also provided with a second convex portion, the outer diameter of the second convex portion is larger than the inner diameter of the through hole of the middle valve cover, so as to limit the movement of the valve stem; The third section is a threaded rod, the outer diameter of the third section is smaller than the outer diameter of the second section, the outer diameter of the first section is larger than the side length of the second section, and the adjacent two sides of the second section are connected by arc transition.

7. A stop valve for fluid control according to claim 4, characterized in that: The first section of the valve stem is also provided with a third protrusion, the outer diameter of the third protrusion is less than or equal to the inner diameter of the through hole of the middle valve cover, the valve stem is circumferentially sleeved with an elastic sealing sleeve, the cross-section of the elastic sealing sleeve is T-shaped, one side of the elastic sealing sleeve is sealed and arranged between the upper valve cover and the middle valve cover, and the upper valve cover and the middle valve cover are tightly connected.

8. A stop valve for fluid control according to claim 1, characterized in that: The driving member includes a fourth section, a fifth section and a sixth section connected in sequence, the fourth section is a cylindrical section, a support seat is annularly arranged on the bottom side of the fourth section, rolling bearings are arranged on both sides of the support seat to facilitate the rotation of the driving member relative to the upper valve cover, the fifth section is engaged with the hand wheel, and the sixth section is connected to the locking nut.

9. A stop valve for fluid control according to claim 1, characterized in that: The longitudinal section of the middle valve cover is an I-shape, a sealing gasket is arranged between the middle valve cover and the valve body, and the middle valve cover and the valve body are tightly connected; The upper valve cover is provided with a groove to install the driving member, the driving member is arranged in the groove of the upper valve cover, the driving sleeve is circumferentially sleeved on the driving member, one side of the driving sleeve is inserted into the groove of the upper valve cover and is fastened to the upper valve cover, and the driving member is provided with a threaded hole connected to the valve stem.

10. A method for operating a stop valve for fluid control according to any one of claims 1 to 9, characterized in that: It includes the following: The valve stem is connected to the valve core; Insert the valve core into the valve body, and the valve body and the middle valve cover are sealed and connected; The valve stem is connected to the driving member through a threaded structure, an upper valve cover is arranged in the circumferential direction of the driving member, the upper valve cover is sealed and connected to the middle valve cover, one section of the valve stem is slidably connected to the middle valve cover or one section of the valve stem is slidably connected to the upper valve cover; The driving member is rotated, because one section of the valve stem is slidably connected with the upper valve cover or the middle valve cover to limit the rotation of the valve stem with the driving member, so that the valve stem drives the valve core to move relative to the valve body along the axial direction of the valve body to realize the opening or closing of the opening and closing channel.

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