Corrugated pipe sealing regulating valve

Abstract

The invention discloses a corrugated pipe sealing regulating valve which comprises a valve body, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod and a valve rod, and is characterized in that the valve body is provided with a through medium channel; the medium channel is provided with a flow channel inlet and a flow channel outlet; the valve cover is arranged at the top of the valve body and covers the accommodating opening; the rocker arm is rotatably mounted on the valve cover by means of a first shaft sleeve; the swing rod penetrates through the containing opening, the first end of the swing rod is fixedly installed on the rocker arm, the second end of the swing rod extends into the medium channel, and a valve disc used for blocking or opening the flow channel inlet and the flow channel outlet is installed at the second end of the swing rod. The upper end of the corrugated pipe is hermetically welded on the bottom surface of the rocker arm, and the lower end of the corrugated pipe is hermetically welded on the inner peripheral wall of the accommodating opening; the executing mechanism is used for transversely pushing the rocker arm to swing around the axis of the first shaft sleeve and driving the swing rod and the valve disc to move. The disc valve can solve the problem that a traditional common disc valve does not have a corrugated pipe sealing function, and application of the disc valve under toxic and harmful working conditions is limited.

Description

Technical Field

[0001] The present invention relates to the field of regulating valves, and in particular to a bellows sealed regulating valve. Background Art

[0002] With the development of industrialization, solid-containing processes are becoming increasingly common, such as polysilicon, coal-to-gas, and coal-to-liquids, placing increasing demands on valves. The disc valve's unique self-grinding hard sealing surface continuously improves its sealing performance during use with abrasive and erosive materials, extending its service life beyond that of other valves.

[0003] Bellows-sealed valves are suitable for use in pipelines carrying hazardous media such as steam, flammable and explosive materials, thermal oil, toxic materials, and molten salts. The bellows seal design effectively blocks the medium while retaining the original stem packing structure. This double seal ensures the reliability of the valve stem. Therefore, bellows-sealed valves are widely used in industries such as petroleum, chemical, natural gas, photovoltaics, and nuclear power.

[0004] Since the closing member of the disc valve is a swinging structure and the valve stem performs a rotary motion, ordinary disc valves do not have bellows seal products, which limits the application of disc valves in toxic and hazardous working conditions. Summary of the Invention

[0005] In order to overcome the above disadvantages, the object of the present invention is to provide a bellows sealed regulating valve.

[0006] In order to achieve the above objectives, the technical solutions adopted by the present invention include: The valve body has a medium passage running through it, the medium passage is provided with a flow channel inlet and a flow channel outlet, and the top of the valve body is provided with a receiving port communicating with the medium passage; the valve cover is provided at the top of the valve body and covers the receiving port; the rocker arm is rotatably mounted on the valve cover by means of a first shaft sleeve, and the axial direction of the first shaft sleeve is parallel to the axial direction of the medium passage; the rocker arm has a first end and a second end, the rocker arm passes through the receiving port so that the first end is fixedly mounted on the rocker arm and the second end extends into the medium passage, and the second end of the rocker arm is mounted with a valve disc for blocking or opening the flow channel inlet and the flow channel outlet; the bellows, the upper end of the bellows is seal-welded to the bottom surface of the rocker arm, and the lower end of the bellows is seal-welded to the inner circumferential wall of the receiving port; the actuator is provided on the valve cover and is used to laterally push the rocker arm to swing around the axis of the first shaft sleeve, thereby driving the rocker arm and the valve disc to move, thereby realizing the opening and closing control of the flow channel inlet and the flow channel outlet.

[0007] In the preferred technical solution of the above-mentioned bellows-sealed regulating valve, the actuator includes a valve stem transversely threadedly mounted on the valve cover, the valve stem having a sleeve end and a handle end, the sleeve end extending into the valve cover and having an opening on the side facing the rocker arm, the extension portion formed on the upper part of the rocker arm extending into the sleeve end of the valve stem through the opening, so that when the valve stem moves transversely relative to the valve cover, the extension portion moves within the sleeve end to push the rocker arm to swing around the axis of the first sleeve.

[0008] In the preferred technical solution of the above-mentioned bellows-sealed regulating valve, the extension portion is a shaft head rotatably mounted on the side of the rocker arm through a second sleeve and a core shaft, the core shaft is rotatably mounted in the second sleeve, the shaft head is rotatably mounted on the core shaft, and the axial direction of the second sleeve is parallel to the axial direction of the medium channel.

[0009] In the preferred technical solution of the above-mentioned bellows-sealed regulating valve, the second sleeve is an eccentric sleeve, which is rotatable relative to the rocker arm and is fixedly mounted on the rocker arm by means of a locking member.

[0010] In the preferred technical solution of the above-mentioned bellows-sealed regulating valve, the locking member is a circular serrated structure that rotates synchronously with the second sleeve and a buckle that is provided on the rocker arm and can extend into the tooth groove of the serrated structure.

[0011] In the preferred technical solution of the bellows-sealed regulating valve, a plurality of rolling elements are installed between the shaft head and the core shaft and are evenly arranged around the central axis of the shaft head.

[0012] In the preferred technical solution of the above-mentioned bellows-sealed regulating valve, the valve disc includes a first sealing part and a second sealing part symmetrically arranged on both sides of the second end of the rocker rod along the axial direction of the medium channel, and the first sealing part and the second sealing part are connected by an elastic member.

[0013] In the preferred technical solution of the above-mentioned bellows sealed regulating valve, the flow channel inlet and the flow channel outlet are both recessed into the interior of the medium channel to form a boss, and along the swinging direction of the valve disc, at least one guide rib flush with the boss surface is provided in the medium channel.

[0014] In the preferred technical solution of the above-mentioned bellows-sealed regulating valve, the central axis of the first sleeve is located relatively in the middle of the bellows.

[0015] In the preferred technical solution of the above-mentioned bellows-sealed regulating valve, the bellows is made of stainless steel, and the wall thickness of the bellows is 0.3-0.9 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the present invention; Figure 2 Schematic diagram of the internal structure of the valve body and valve cover after cutting open; Figure 3 The cross-sectional view of the present invention Figure 1 ; Figure 4 The cross-sectional view of the present invention Figure 2 ; Figure 5 The cross-sectional view of the present invention Figure 3 ; Figure 6 This is the connection diagram between the actuator and the rocker arm; Figure 7 It is a structural diagram of the actuator; Figure 8 This is a diagram showing the connection between some actuators and rocker arms; Figure 9 Schematic diagram of the rocker arm; Figure 10 is a cross-sectional view of the rocker arm; In the figure: valve body 1, medium channel 101, flow channel inlet 102, flow channel outlet 103, accommodating port 104, valve cover 2, rocker arm 3, first sleeve 4, rocker rod 5, valve disc 6, first sealing part 61, second sealing part 62, bellows 7, actuator 8, valve stem 81, socket end 811, opening 8111, handle end 812, second sleeve 91, core shaft 92, shaft head 93, rolling element 94, serrated structure 111, buckle 112, side cover body 12, filling hole 121, ear plate 131, pressing sleeve 132, disc spring 133, elastic member 14, boss 15, guide rib 16. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0018] It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "front," and "rear" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and are not intended to indicate or imply that the device or component described must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0020] like Figures 1 to 10 As shown, the bellows-sealed regulating valve of the present invention comprises: a valve body 1 having a medium passage 101 extending therethrough, the medium passage 101 being provided with a flow passage inlet 102 and a flow passage outlet 103, a top portion of the valve body 1 being provided with a receiving port 104 communicating with the medium passage 101; a valve cover 2 being provided on the top portion of the valve body 1 and covering the receiving port 104; a rocker arm 3 being rotatably mounted on the valve cover 2 by means of a first shaft sleeve 4, the axis direction of the first shaft sleeve 4 being parallel to the axis direction of the medium passage 101; a rocker arm 5 having a first end and a second end, the rocker arm 5 passing through the receiving port 104 , with the first end fixedly mounted on the rocker arm 3 and the second end extending into the medium channel 101; the second end of the rocker rod 5 is mounted with a valve disc 6 for blocking or opening the flow channel inlet 102 and the flow channel outlet 103; the bellows 7, the upper end of the bellows 7 is seal-welded to the bottom surface of the rocker arm 3, and the lower end of the bellows 7 is seal-welded to the inner circumferential wall of the accommodating port 104; the actuator 8 is provided on the valve cover 2, and is used to push the rocker arm 3 laterally to swing around the axis of the first shaft sleeve 4, thereby driving the rocker rod 5 and the valve disc 6 to move, thereby realizing the opening and closing control of the flow channel inlet 102 and the flow channel outlet 103.

[0021] See also Figures 1 to 3 The lower part of the valve body 1 has a through medium channel 101, the inlet of the medium channel 101 is the flow channel inlet 102, the outlet of the medium channel 101 is the flow channel outlet 103, the accommodating port 104 opened on the top of the valve body 1 connects the medium channel 101 with the outside of the valve body 1, and a valve cover 2 with a frame-shaped cross-section is installed on the top of the valve body 1. The valve cover 2 surrounds the accommodating port 104. Along the central axis direction of the medium channel 101 or the flow channel inlet 102 and the flow channel outlet 103, a first shaft sleeve 4 is rotatably installed on the valve cover 2. The rocker arm 3 is rotatably installed in the valve cover 2 with the help of a shaft sleeve. The rocker rod 5 has a first end and a second end. The first end of the rocker rod 5 is fixed on the rocker arm 3. The rocker rod 5 passes through the accommodating port 104 and places the second end in the medium channel 101. The second end of the rocker rod 5 is installed with a valve disc 6 that is adapted to the flow channel inlet 102 and the flow channel outlet 103. When the rocker arm 5 swings with the rocker arm 3, the valve disc 6 can block or open the flow channel inlet 102 and the flow channel outlet 103, thereby realizing the control of the fluid flow in the medium channel 101.

[0022] See also Figure 2 、 Figure 3The upper end of the bellows 7 is welded to the bottom surface of the rocker arm 3, and the lower end of the bellows 7 is welded to the inner wall of the accommodating port 104 of the valve body 1. The rocker rod 5 is located on the inner side of the bellows 7, so that the medium channel 101 is connected to the inside of the bellows 7, and the medium channel 101 is not connected to the internal space of the valve cover 2. Through this arrangement, the regulating valve of the present application can be used in toxic and harmful working conditions, avoiding the possibility of leakage of toxic and harmful substances, and improving the use effect and scope of application of the present application.

[0023] See also Figure 1 、 Figure 4 , the actuator 8 is arranged on the side of the valve cover 2 along a direction perpendicular to the central axis of the medium channel 101. The actuator 8 can push the upper position of the rocker arm 3 back and forth along a direction perpendicular to the central axis of the medium channel 101, so that the rocker arm 3 swings along the central axis of the first sleeve 4, and then the rocker arm 3 drives the rocker rod 5 to swing, so that the valve disc 6 at the second end of the rocker rod 5 blocks or opens the flow channel inlet 102 and the flow channel outlet 103; it can be understood that since the rocker rod 5 is always in the bellows 7 and the medium channel 101, the fluid in the medium channel 101 will not flow out of the valve cover 2 through the accommodating port 104, which effectively improves the sealing effect of the present application, so that the regulating valve of the present application can adapt to the use requirements under different working conditions, especially in the environment of transporting toxic and harmful substances. In addition, it should be noted that when the actuator 8 drives the rocker arm 3 to swing, the bellows 7 will synchronously deform to adapt to the movement of the rocker arm 3.

[0024] In one or more embodiments, the actuator 8 includes a valve stem 81 that is transversely threadedly mounted on the valve cover 2. The valve stem 81 has a socket end 811 and a handle end 812. The socket end 811 extends into the valve cover 2 and has an opening 8111 on the side facing the rocker arm 3. The extension formed on the upper part of the rocker arm 3 extends into the socket end 811 of the valve stem 81 through the opening 8111, so that when the valve stem 81 moves laterally relative to the valve cover 2, the extension moves in the socket end 811 to push the rocker arm 3 to swing around the axis of the first shaft sleeve 4.

[0025] See also Figures 1 to 7 The valve stem 81 has a sleeve end 811 and a handle end 812. The valve stem 81 is threadedly installed on the side of the valve cover 2 in a direction perpendicular to the axis of the medium channel 101. The handle end 812 has a round handle for the user to rotate the valve stem 81. The cross-section of the sleeve end 811 along the height direction is an inverted U-shaped structure. The sleeve end 811 of the valve stem 81 has an opening 8111 on the side of the extension portion facing the rocker arm 3. The extension portion can extend into the opening 8111 to be restricted in movement by the internal shape of the sleeve end 811.

[0026] Specifically, when the actuator 8 controls the rocker arm 3 and the rocker rod 5 to swing, by rotating the handle end 812 of the valve stem 81 clockwise or counterclockwise, the sleeve end 811 of the valve stem 81 moves horizontally in the valve cover 2 along the direction perpendicular to the central axis of the first shaft sleeve 4, and the extended portion of the rocker arm 3 located in the sleeve end 811 is pushed by the valve stem 81 and moves up or down in the U-shaped channel of the sleeve end 811 of the valve stem 81, thereby causing the rocker arm 3 to swing around the central axis of the first shaft sleeve 4, and the rocker arm 3 drives the rocker rod 5 to swing, so that the valve disc 6 installed at the second end of the rocker rod 5 blocks or opens the flow channel inlet 102 and the flow channel outlet 103. While the rocker arm 3 swings, it can press the bellows 7 to deform. With the help of the sealing effect of the bellows 7, the medium channel 101 will not be connected with the inside of the valve cover 2 during the swinging process of the rocker arm 5, thereby improving the sealing effect of the present application.

[0027] In one or more embodiments, the extension portion is a shaft head 93 rotatably mounted on the side of the rocker arm 3 through a second shaft sleeve 91 and a core shaft 92, the core shaft 92 is rotatably mounted in the second shaft sleeve 91, and the shaft head 93 is rotatably mounted on the core shaft 92, and the axial direction of the second shaft sleeve 91 is parallel to the axial direction of the medium channel 101; a plurality of rolling members 94 are installed between the shaft head 93 and the core shaft 92, and are evenly arranged with the central axis of the shaft head 93 as the center.

[0028] See also Figures 7 to 10 The extension portion includes a second sleeve 91, a core shaft 92 and a shaft head 93; wherein the second sleeve 91 is mounted on the upper portion of the rocker arm 3 in a direction parallel to the axis of the medium channel 101, the core shaft 92 is rotatably mounted in the second sleeve 91, and the shaft head 93 is rotatably mounted on the core shaft 92 through a rolling member 94. The rolling member 94 can be a ball or a needle. In this way, the friction of the shaft head 93 in the U-shaped channel of the sleeve end 811 of the valve stem 81 can be reduced, which facilitates the rotation of the shaft head 93 , improving the smoothness of the rocker arm 3 when swinging; the shaft head 93 is placed in the U-shaped channel of the sleeve end 811 of the valve stem 81, and the outer surface of the shaft head 93 abuts against the inner wall of the U-shaped channel of the sleeve end 811, so that when the sleeve end 811 of the valve stem 81 moves in a direction perpendicular to the axis of the first shaft sleeve 4, the shaft head 93 is restricted by the U-shaped channel of the sleeve end 811, and moves vertically up or down in the U-shaped channel of the sleeve end 811 of the valve stem 81, thereby driving the rocker arm 3 to swing around the axis of the first shaft sleeve 4.

[0029] See also Figure 7 It should be noted that the sleeve end 811 at the second end of the valve stem 81 is in a rotational connection with the rod body of the valve stem 81. When the valve stem 81 rotates relative to the valve cover 2, the sleeve end 811 is restricted by the shaft head 93 and will not rotate circumferentially with the valve stem 81, thereby ensuring the stability of the connection between the shaft head 93 and the sleeve end 811 of the valve stem 81 and realizing the smooth swing of the rocker arm 3.

[0030] In one or more embodiments, the second sleeve 91 is an eccentric sleeve, which is rotatable relative to the rocker arm 3 and is fixedly mounted on the rocker arm 3 by means of a locking member; the locking member is a circular serrated structure 111 that rotates synchronously with the second sleeve 91 and a buckle 112 that is provided on the rocker arm 3 and can extend into the tooth groove of the serrated structure 111.

[0031] See also Figures 7 to 10 A circular serrated structure 111 is fixedly mounted on the second sleeve 91, and a buckle 112 is detachably mounted on the rocker arm 3. The buckle 112 can enter the tooth groove of the serrated structure 111, thereby limiting the serrated structure 111 and fixing the second sleeve 91 on the rocker arm 3.

[0032] It is understandable that, due to certain errors in the processing or assembly of the valve disc 6 and the valve stem 81 in the regulating valve of the present application, in order to effectively drive the valve disc 6 to block the flow channel inlet 102 and the flow channel outlet 103, it is necessary to adjust the initial position of the valve disc 6. Specifically, since the second shaft sleeve 91 is an eccentric shaft sleeve, the initial swing position of the rocker arm 3 can be adjusted by rotating the second shaft sleeve 91 clockwise or counterclockwise to drive a slight deflection of the rocker arm 3, thereby adjusting the initial position of the valve disc 6 and improving the sealing degree of the valve disc 6 for blocking the flow channel inlet 102 and the flow channel outlet 103. After the second shaft sleeve 91 is adjusted, the buckle 112 is buckled into the tooth groove of the serrated structure 111 and the buckle 112 is fixed to the rocker arm 3, thereby fixing the position of the second shaft sleeve 91 after adjustment.

[0033] In a specific embodiment, a side cover body 12 is installed at the connection between the valve cover 2 and the valve stem 81 by bolts. A through hole is opened on the side cover body 12 along the axial direction of the valve stem 81. The valve stem 81 extends into the valve cover 2 through the through hole. A filling hole 121 is opened around the through hole. The filling hole 121 is filled with sealing filler. A clamping structure is installed on the side cover body 12, and the clamping structure is used to compress the sealing filler in the filling hole 121.

[0034] See also Figures 1 to 7 The compression structure includes at least an ear plate 131 formed on the side cover 12, a compression sleeve 132 provided on the side of the ear plate 131 close to the valve cover 2, and a disc spring 133 connecting the ear plate 131 to the side cover 12. The compression sleeve 132 can extend into the filling hole 121. With the help of the elastic force of the disc spring 133, the ear plate 131 and the compression sleeve 132 always have a compression force toward the filling hole 121, so that the sealing packing in the filling hole 121 can be compressed by the compression sleeve 132. Through this arrangement, a secondary seal can be achieved for the regulating valve of the present application, further improving the safety of the application, meeting the requirements of use under toxic and harmful working conditions, and having practicality.

[0035] In one or more embodiments, the valve disc 6 includes a first sealing portion 61 and a second sealing portion 62 symmetrically arranged on both sides of the second end of the rocker rod 5 along the axial direction of the medium channel 101, and the first sealing portion 61 and the second sealing portion 62 are connected by an elastic member 14; the flow channel inlet 102 and the flow channel outlet 103 are both recessed into the interior of the medium channel 101 to form a boss 15, and along the swing direction of the valve disc 6, at least one guide rib 16 is provided in the medium channel 101 that is flush with the surface of the boss 15.

[0036] See also Figures 2 to 6 In the initial state, the first sealing part 61 and the second sealing part 62 are always pressed against the boss 15 of the flow channel inlet 102 and the flow channel outlet 103 with the help of the elastic force of the elastic member 14. Through this arrangement, the valve disc 6 can further ensure the sealing effect of the flow channel inlet 102 and the flow channel outlet 103; when the rocker arm 3 controls the rocker rod 5 to swing, the first sealing part 61 and the second sealing part 62 gradually no longer block the flow channel inlet 102 and the flow channel outlet 103, the part of the first sealing part 61 moving out of the flow channel inlet 102 and the part of the second sealing part 62 moving out of the flow channel outlet 103 will be pressed against the guide rib 16, and the guide rib 16 can play a role in limiting the first sealing part 61 and the second sealing part 62, thereby ensuring the normal use of the first sealing part 61 and the second sealing part 62.

[0037] In a specific embodiment, the elastic member 14 may be a spring or an elastic airbag.

[0038] In one or more embodiments, the center axis of the first sleeve 4 is located relatively in the middle of the bellows 7 .

[0039] See also Figure 3 Half of the bellows 7 is located above the central axis of the first sleeve 4, and the other half is located below the central axis of the first sleeve 4. Through this arrangement, the twisting and deformation ability of the entire bellows 7 can be fully utilized, the usable length of the bellows 7 can be reduced, and the size of the regulating valve of this application can be reasonably configured.

[0040] In one or more embodiments, the bellows 7 is made of stainless steel, and the wall thickness of the bellows 7 is 0.3-0.9 mm. The bellows 7 made of stainless steel is characterized by high strength, corrosion resistance, and long service life, and can ensure that the regulating valve of this application can transport different media and meet the requirements of use under different operating conditions. It is understood that the wall thickness of the bellows 7 can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or 0.9 mm. There is no specific limitation on the wall thickness of the bellows 7, and the wall thickness of the bellows 7 can be selected according to actual production needs.

[0041] In other possible implementations, the number of the bellows 7 may be two, three, four, etc. When there are multiple bellows 7 , several bellows 7 can be sleeved one by one and then welded.

[0042] The above embodiments are only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bellows sealed regulating valve, characterized in that: include: The valve body has a medium channel running through it, the medium channel is provided with a flow channel inlet and a flow channel outlet, and the top of the valve body is provided with a receiving port communicating with the medium channel; a valve cover, disposed on the top of the valve body and covering the receiving port; a rocker arm rotatably mounted on the valve cover via a first sleeve, wherein the axis of the first sleeve is parallel to the axis of the medium channel; a rocker arm having a first end and a second end, the rocker arm passing through the accommodating opening so that the first end is fixedly mounted on the rocker arm and the second end extends into the medium channel, the second end of the rocker arm being mounted with a valve disc for blocking or opening the flow channel inlet and the flow channel outlet; a bellows, the upper end of the bellows being seal-welded to the bottom surface of the rocker arm, and the lower end of the bellows being seal-welded to the inner circumferential wall of the accommodating opening; The actuator is provided on the valve cover and is used to push the rocker arm laterally to swing around the axis of the first sleeve, thereby driving the rocker rod and the valve disc to move, thereby realizing the opening and closing control of the flow channel inlet and the flow channel outlet.

2. The bellows-sealed regulating valve according to claim 1, characterized in that: The actuator includes a valve stem that is transversely threadedly mounted on the valve cover, the valve stem having a sleeve end and a handle end, the sleeve end extending into the valve cover and having an opening on the side facing the rocker arm, and an extension formed on the upper part of the rocker arm extending into the sleeve end of the valve stem through the opening, so that when the valve stem moves transversely relative to the valve cover, the extension moves within the sleeve end to push the rocker arm to swing around the axis of the first sleeve.

3. The bellows-sealed regulating valve according to claim 2, characterized in that: The extension portion is a shaft head rotatably mounted on the side of the rocker arm through a second shaft sleeve and a core shaft, the core shaft is rotatably mounted in the second shaft sleeve, the shaft head is rotatably mounted on the core shaft, and the axial direction of the second shaft sleeve is parallel to the axial direction of the medium channel.

4. The bellows-sealed regulating valve according to claim 3, characterized in that: The second shaft sleeve is an eccentric shaft sleeve, which is rotatable relative to the rocker arm and is fixedly mounted on the rocker arm by means of a locking member.

5. The bellows-sealed regulating valve according to claim 4, characterized in that: The locking member is a circular sawtooth structure that rotates synchronously with the second shaft sleeve and a buckle that is arranged on the rocker arm and can extend into the tooth groove of the sawtooth structure.

6. The bellows-sealed regulating valve according to claim 3, characterized in that: A plurality of rolling elements are installed between the shaft head and the core shaft and are evenly arranged with the central axis of the shaft head as the center.

7. The bellows-sealed regulating valve according to claim 1, characterized in that: The valve disc includes a first sealing portion and a second sealing portion symmetrically arranged on both sides of the second end of the rocker rod along the axis of the medium channel. The first sealing portion and the second sealing portion are connected by an elastic member.

8. The bellows-sealed regulating valve according to claim 7, characterized in that: The flow channel inlet and the flow channel outlet are both concave toward the inside of the medium channel to form a boss. Along the swing direction of the valve disc, at least one guide rib flush with the surface of the boss is provided in the medium channel.

9. The bellows-sealed regulating valve according to claim 1, characterized in that: The center axis of the first sleeve is relatively located in the middle of the bellows.

10. The bellows-sealed regulating valve according to claim 1, characterized in that: The bellows is made of stainless steel, and the wall thickness of the bellows is 0.3-0.9 mm.

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