A manually operated arc valve

Abstract

This utility model provides a manual arc-shaped valve, including a valve body with a valve cavity inside and an inlet / outlet on the side. A rotating shaft is located within the valve cavity, comprising a shaft portion and an arc-shaped spring piece. The arc-shaped spring piece protrudes radially outward, and a sealing diaphragm is provided between the arc-shaped spring piece and the inner wall of the valve cavity, capable of sealing the inlet / outlet. The shaft portion of the rotating shaft extends upward beyond the valve body, and a valve cover is fitted onto its upper end, with the shaft portion and valve cover rotatably connected. The outer edge of the valve cover is fixed to the valve body. A rotating seat is located at the upper end of the shaft portion, and a fixed upper cover is provided on the rotating seat, restricting the rotating seat to the shaft portion so that the rotating seat and rotating shaft can rotate synchronously. The fixed upper cover extends from the upper end of the rotating seat, and a rotating handle is connected to its side. An adjusting plug is located at the bottom of the valve body, with its upper end extending into the valve cavity and tapered. The lower end of the arc-shaped spring piece abuts against the tapered surface of the adjusting plug. This valve features a simple structure, high assembly efficiency, low cost, and light weight.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a manual arc valve. Background Technology

[0002] In the valve industry market, arc valves are suitable for viscous / paste-like products and fluids containing solid particles, including large particles, or products with strict requirements for maximum pressure loss. This design is used in the food, chemical, pharmaceutical and many other industries.

[0003] Features of arc valves: 1. (Hygienic Design) Completely transparent channel - no pressure loss, no product residue or solid particle adhesion; 2. Used to replace traditional three-way ball valves, the hygienic design facilitates online CIP / SIP; 3. The arc valve has very reliable performance, few components, simple structure and easy maintenance; even the welded type can be completely disassembled. 4. The product features user-friendly drainage, ensuring unobstructed flow and no pressure loss.

[0004] Problems and shortcomings of existing technologies: 1. Currently, in the valve industry market, the rotating shaft of most arc valves is not fixed, and it relies entirely on the adjusting plug below for adjustment. The shortcomings of this structure are: during assembly and debugging, all parts must be installed before the position of the rotating handle can be adjusted. Otherwise, turning the handle will cause the rotating shaft to slip off naturally, causing the sealing ring to fall out, affecting the assembly and debugging speed and resulting in low efficiency. Moreover, during assembly, the adjusting plug and fixing nut must be fully installed before the handle can be rotated. Due to the closed internal structure, problems are not easy to find.

[0005] 2. Traditional arc-shaped valve bodies typically have sealing diaphragms composed of 2-3 parts, which increases material costs, processing costs, and assembly costs, ultimately raising the overall product cost.

[0006] 3. In traditional arc valves, the arc spring is a large arc that directly contacts the sealing diaphragm. This results in a narrow space between the sealing diaphragm and the arc spring, making it difficult to clean and prone to leaving liquid or particles.

[0007] Therefore, it is necessary to improve the existing arc valve to solve the above problems. Utility Model Content

[0008] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a manual arc valve.

[0009] The technical solution adopted by this utility model to solve its technical problem is as follows: a manual arc valve, including a valve body, a valve cavity provided in the valve body, at least two inlets and outlets communicating with the valve cavity, a rotating shaft provided in the valve cavity, the rotating shaft including an integrally connected shaft portion and an arc-shaped spring piece, the arc-shaped spring piece protruding radially outward, a sealing diaphragm provided between the arc-shaped spring piece and the inner wall of the valve cavity, the sealing diaphragm being able to block the inlet and outlet, the shaft portion of the rotating shaft extending upward out of the valve body, a valve cover fitted at the upper end, the shaft portion and the valve cover being rotatably connected, the outer edge of the valve cover being fixed to the valve body, a rotating seat provided at the upper end of the shaft portion, a fixed upper cover provided on the rotating seat, and the rotating seat being restricted on the shaft portion by the fixed upper cover, so that the rotating seat and the rotating shaft can rotate synchronously, the fixed upper cover extending from the upper end of the rotating seat, a rotating handle connected to the side, an adjusting plug provided at the bottom of the valve body, the upper end of the adjusting plug extending into the valve cavity, and the end being tapered, the lower end of the arc-shaped spring piece abutting against the tapered surface of the adjusting plug. By adjusting the height of the plug extending into the valve, the outward bending degree of the arc-shaped spring can be adjusted, thereby adjusting the pressure applied by the arc-shaped spring to the sealing diaphragm to ensure the reliability of the seal.

[0010] The structure of the top cover assembly has been changed, allowing personnel to rotate the handle independently while assembling the top cover assembly to check the assembly effect, without having to assemble the entire assembly before rotation and adjustment, thus improving assembly efficiency and yield. At the same time, the structure has been optimized, reducing the height of the rotating shaft, valve cover, and fixed top cover, improving material utilization, reducing processing costs, and making the overall weight lighter without affecting overall performance.

[0011] Furthermore, to ensure smooth rotation of the shaft within the valve cover, a raised ring is provided on the inner wall of the valve cover, and a wear-resistant sleeve is provided between the raised ring and the shaft. The wear-resistant sleeve prevents wear between the shaft and the valve cover, and also allows for smoother rotation of the shaft.

[0012] To facilitate the assembly of the wear-resistant sleeve onto the convex ring, the wear-resistant sleeve includes an upper wear-resistant sleeve and a lower wear-resistant sleeve. The upper wear-resistant sleeve wraps around the upper part of the convex ring from top to bottom, and the lower wear-resistant sleeve wraps around the lower part of the convex ring from bottom to top. Both have identical structures. During assembly, the upper and lower wear-resistant sleeves are mirror-symmetrical, completely enclosing the convex ring, and the overall axial cross-section is I-shaped.

[0013] Furthermore, to achieve synchronous rotation of the rotating shaft and the rotating seat, an anti-rotation part is provided at the upper end of the shaft, and an anti-rotation groove adapted to the anti-rotation part is provided on the lower end surface of the rotating seat. During assembly, the anti-rotation part is embedded in the anti-rotation groove, which can limit the relative rotation between the rotating seat and the rotating shaft. The anti-rotation part can be a cylindrical chip anti-rotation surface, or it can directly adopt a prism structure. In this embodiment, the anti-rotation part is a quadrangular prism structure.

[0014] Furthermore, in order to enable the arc-shaped spring to drive the sealing diaphragm, a protrusion is provided at the contact position between the arc-shaped spring and the sealing diaphragm, and the protrusion is interference-fitted with the sealing diaphragm.

[0015] The structure of the arc-shaped spring is optimized by raising a small arc at the contact point with the sealing diaphragm to form a protrusion. This increases the distance between the sealing diaphragm and the arc-shaped spring, which facilitates online cleaning and sterilization of the arc-shaped valve and improves its hygiene.

[0016] Furthermore, in order to achieve the connection and fixation of the adjusting plug, a locking nut is also included. The lower end of the valve body is provided with a connecting sleeve, the adjusting plug is disposed in the connecting sleeve, the outer wall of the connecting sleeve is provided with external threads, and the locking nut is threadedly connected to the connecting sleeve to lock the adjusting plug onto the valve body.

[0017] Furthermore, it also includes a sealing structure, which includes a first O-ring, a second O-ring, and a third O-ring. The first O-ring is disposed between the valve cover and the shaft, and is located below the wear-resistant sleeve, for achieving a seal between the valve cover and the shaft. The second O-ring is disposed between the connecting surfaces of the valve cover and the valve body, for achieving a seal between the valve cover and the valve body. The third O-ring is disposed between the connecting surfaces of the valve body and the adjusting plug, for sealing between the valve body and the adjusting plug.

[0018] Furthermore, the rotary handle includes a rotary rod and a handle. One end of the rotary rod is threaded onto the rotary seat, and the other end extends radially, with the handle connected to the other end. By rotating the handle, the rotary seat, the rotary shaft, and the sealing diaphragm can be rotated in sequence, thereby realizing the opening and closing of the inlet and outlet.

[0019] Furthermore, the outer edge of the fixed cover and the upper end of the valve cover are provided with matching threaded holes, and the fixed cover and the valve cover are fixed by connecting them in the threaded holes with external hexagonal bolts.

[0020] Furthermore, the outer edge of the valve cover and the upper end of the valve body are provided with matching threaded holes, and the valve cover and the valve body are fixed by connecting them in the threaded holes with external hexagonal bolts.

[0021] The beneficial effects of this utility model are: (1) This invention solves the problem that traditional arc-shaped valve bodies require the entire valve body to be assembled before the rotary handle can be adjusted, making it difficult to spot problems and affecting assembly efficiency. The invention uses a double wear-resistant sleeve upper and lower clip assembly, which solves the problem of the rotating shaft slipping off during the adjustment of the rotary handle. At the same time, the structure is optimized, the height of the rotating shaft and the top cover is reduced, the material utilization rate is improved, the processing cost is reduced, and the overall weight is lighter without affecting the overall performance.

[0022] (2) Traditional arc-shaped valve bodies typically have sealing diaphragms composed of 2-3 parts, which increases material / processing and assembly costs, ultimately raising the overall product price. This invention directly changes the overall structure of the sealing diaphragm, making it a single part instead of assembling two or three parts together, directly saving material, processing, and assembly costs.

[0023] (3) In traditional arc valves, the arc spring is formed by a large arc directly contacting the sealing diaphragm, resulting in a narrow space between the sealing diaphragm and the arc spring, making it difficult to clean and prone to leaving liquid or particles. This utility model optimizes the arc spring structure by raising a small arc at the contact point with the sealing diaphragm to form a protrusion, increasing the distance between the sealing diaphragm and the arc spring, which is beneficial for online cleaning and sterilization of the arc valve and improves the hygiene of the arc valve. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is an exploded structural diagram of the manual arc valve of this utility model.

[0026] Figure 2 This is a top view of the manual arc valve.

[0027] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of AA.

[0028] Figure 4 yes Figure 2 A schematic diagram of the cross-sectional structure of BB.

[0029] Figure 5 yes Figure 4 A magnified structural diagram of point A in the middle.

[0030] Figure 6 yes Figure 2 A partial cross-sectional structural diagram of the import / export direction.

[0031] In the diagram: 1. Valve body, 1.1. Inlet / outlet, 1.2. Valve cavity; 2. Rotating shaft, 2.1. Shaft, 2.2. Arc-shaped spring, 2.3. Protrusion; 3. Sealing diaphragm; 4. Valve cover; 5. Upper wear-resistant sleeve; 6. Adjusting plug; 7. Locking nut; 8. Fixed upper cover; 9. Handle; 10. Rotating rod; 11. Rotating seat; 12. Stainless steel spring positioning ball; 13. Positioning pin; 14. First O-ring; 15. Second O-ring; 16. Third O-ring; 17. External hexagonal bolt; 18. Internal hexagonal countersunk screw; 19. Lower wear-resistant sleeve. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figures 1-6 As shown, this utility model discloses a manual arc-shaped valve, comprising a valve body 1, wherein the valve body 1 has a valve cavity 1.2 for fluid passage, and the valve body 1 has at least two inlet / outlet ports 1.1 communicating with the valve cavity 1.2. The number of inlet / outlet ports can be designed according to the number of channels. In this embodiment, two channels are taken as an example, therefore, two inlet / outlet ports 1.1 are arranged symmetrically in the radial direction. The valve cavity 1.2 is provided with a rotating shaft 2, which includes an integrally connected shaft portion 2.1 and an arc-shaped spring piece 2.2, and the arc-shaped spring piece 2.2 protrudes outward in the radial direction. A sealing diaphragm 3 is provided between the arc-shaped spring piece 2.2 and the inner wall of the valve cavity 1.2, and the sealing diaphragm 3 can block the inlet / outlet ports 1.1, such as... Figure 5As shown, the arc-shaped spring piece 2.2 has a protrusion 2.3 at the contact position with the sealing diaphragm 3, and the protrusion 2.3 is embedded in the sealing diaphragm 3 and has an interference fit with the sealing diaphragm 3. The shaft portion 2.1 of the rotating shaft 2 extends upward from the valve body 1, and a valve cover 4 is fitted on the upper end. The shaft portion 2.1 and the valve cover 4 are rotatably connected. In order to ensure smooth rotation of the shaft portion 2.1 in the valve cover 4, a convex ring is provided on the inner wall of the valve cover 4, and a wear-resistant sleeve is provided between the convex ring and the shaft portion 2.1. The wear-resistant sleeve avoids wear between the shaft portion 2.1 and the valve cover 4, and at the same time, it can make the rotation of the shaft portion 2.1 smoother. The wear-resistant sleeve includes an upper wear-resistant sleeve 5 and a lower wear-resistant sleeve 19. The upper wear-resistant sleeve 5 wraps around the upper part of the convex ring from top to bottom, and the lower wear-resistant sleeve 19 wraps around the lower part of the convex ring from bottom to top. Both have the same structure. During assembly, the upper wear-resistant sleeve 5 and the lower wear-resistant sleeve 19 are mirror-symmetrical and completely enclose the convex ring, with the overall axial cross-section being I-shaped. The outer edge of the valve cover 4 and the upper end of the valve body 1 are provided with matching threaded holes. The valve cover 4 and the valve body 1 are fixed by connecting them in the threaded holes with external hexagonal bolts 17. In order to achieve quick positioning between the valve cover 4 and the valve body 1 and ensure their coaxiality, a positioning pin 13 is also included. The positioning pin 13 is set on the connecting surface between the valve cover 4 and the valve body 1, and its lower end is embedded in the positioning hole of the valve body 1. The bottom surface of the valve cover 4 is provided with a positioning groove, and the upper end of the positioning pin 13 is embedded in the positioning groove. The upper end of the shaft 2.1 is provided with a rotating seat 11, and a fixed upper cover 8 is provided on the rotating seat 11. The outer edge of the fixed upper cover 8 and the upper end of the valve cover 4 are provided with matching threaded holes. The fixed upper cover 8 and the valve cover 4 are fixed by connecting them in the threaded holes with external hexagonal bolts 17. To achieve rapid positioning between the fixed top cover 8 and the rotating seat 11 and ensure their coaxiality during assembly, a stainless steel spring positioning bead 12 is also included. The stainless steel spring positioning bead 12 is disposed between the flange of the fixed top cover 8 and the rotating seat 11. The flange of the rotating seat 11 is provided with positioning holes. The lower end of the stainless steel spring positioning bead 12 is embedded in the positioning holes. The bottom surface of the fixed top cover 8 is provided with positioning grooves that correspond one-to-one with the positioning holes. Under the action of elastic force, the upper end of the stainless steel spring positioning bead 12 is embedded in the positioning groove, elastically connecting the two. When the rotating seat rotates, it can ensure that the stainless steel spring positioning bead 12 is dislodged from the positioning groove. When it is rotated to the correct position, the stainless steel spring positioning bead 12 is embedded back into the positioning groove. The position of the positioning groove is adapted to the valve opening and closing position. The rotating seat 11 is fixed to the shaft portion 2.1 by the fixed upper cover 8, so that the rotating seat 11 and the rotating shaft 2 can rotate synchronously. In this embodiment, the upper end of the shaft portion 2.1 is provided with an anti-rotation part, and the lower end surface of the rotating seat 11 is provided with an anti-rotation groove adapted to the anti-rotation part. During assembly, the anti-rotation part is embedded in the anti-rotation groove, which can limit the relative rotation between the rotating seat 11 and the rotating shaft 2. The anti-rotation part can be a cylindrical chip anti-rotation surface, or it can directly adopt a prism structure. In this embodiment, the anti-rotation part is a quadrangular prism structure.To ensure a reliable connection between the rotating seat 11 and the rotating shaft 2, they are also connected and fixed by countersunk hexagonal screws 18. A fixed top cover 8 extends from the upper end of the rotating seat 11, and a rotating handle is connected to its side. The rotating handle includes a rotating rod 10 and a handle 9. One end of the rotating rod 10 is threaded onto the rotating seat 11, and the other end extends radially, connecting to the handle 9. Rotating the handle sequentially rotates the rotating seat 11, the rotating shaft 2, and the sealing diaphragm 3, thereby opening and closing the inlet and outlet 1.1. An adjusting plug 6 is provided at the bottom of the valve body 1. The upper end of the adjusting plug 6 extends into the valve cavity 1.2 and is tapered. The lower end of the arc-shaped spring 2.2 abuts against the tapered surface of the adjusting plug 6. By adjusting the height of the adjusting plug 6 extending into the valve, the outward bending degree of the arc-shaped spring 2.2 can be adjusted, thereby adjusting the pressure applied by the arc-shaped spring 2.2 to the sealing diaphragm 3 to ensure reliable sealing. To achieve the connection and fixation of the adjusting plug 6, a locking nut 7 is also included. The lower end of the valve body 1 is provided with a connecting sleeve, the adjusting plug 6 is placed inside the connecting sleeve, the outer wall of the connecting sleeve is provided with external threads, and the locking nut 7 is threaded onto the connecting sleeve to lock the adjusting plug 6 onto the valve body 1.

[0036] Furthermore, a sealing structure is also included, comprising a first O-ring 14, a second O-ring 15, and a third O-ring 16. The first O-ring 14 is disposed between the valve cover 4 and the shaft portion 2.1, and is located below the wear-resistant sleeve, for achieving a seal between the valve cover 4 and the shaft portion 2.1. The second O-ring 15 is disposed between the connecting surfaces of the valve cover 4 and the valve body 1, for achieving a seal between the valve cover 4 and the valve body 1. The third O-ring 16 is disposed between the connecting surfaces of the valve body 1 and the adjusting plug 6, for sealing between the valve body 1 and the adjusting plug 6.

[0037] During assembly, a sealing diaphragm 3 is installed inside the valve body 1. The rotating shaft 2 is fitted with a first O-ring 14 and assembled at the center of the valve body 1. The arc-shaped spring 2.2 of the rotating shaft 2 aligns with the sealing diaphragm 3. The valve cover 4 is connected to the valve body 1 and has a built-in second O-ring 15 as a sealing ring. A wear-resistant sleeve is fitted between the valve cover 4 and the rotating shaft 2. The rotating seat 11 is threaded onto the rotating shaft 2. A fixed top cover 8 is installed, and the handle 9 and rotating rod 10 are mounted on the rotating seat 11. The adjusting plug 6 is fitted and connected to the connecting sleeve at the bottom hole of the valve body 1, and has a built-in third O-ring 16. The locking nut 7 is installed on the bottom thread of the valve body 1.

[0038] Working principle: When adjusting the rotary handle, the rotary seat 11 drives the rotary shaft 2, which in turn drives the sealing diaphragm 3 to rotate. The lower locking nut 7 can be used to set the torque, and the force between the adjusting plug 6 and the arc-shaped spring of the rotary shaft 2 can be adjusted to achieve a seal.

[0039] When in operation, adjusting the rotary handle can drive the sealing diaphragm 3 to make circular motions within the valve body 1, thereby opening and closing the valve.

[0040] When the handle is in the Close position (initial position), the upper flow channel is closed; when rotated 90° clockwise (Open) (stainless steel spring positioning ball 12 pops up), both the upper and lower flow channels open. When rotated 90° clockwise again (Close) (stainless steel spring positioning ball 12 pops up), the lower flow channel closes. The rotating shaft 2 can rotate 360°, which can meet the needs of two-way pipes / three-way pipes / four-way pipes, allowing the flow channel of any outlet to be closed or opened.

[0041] When the valve needs to be opened, manually adjust the rotating handle to rotate the rotating seat 11, rotating shaft 2 and sealing diaphragm 3 together, so that the rotating handle moves from the CLOSE position to the OPEN position; when the valve needs to be closed, manually adjust the rotating handle again to rotate the rotating seat 11, rotating shaft 2 and sealing diaphragm 3 together, so that the rotating handle moves from the OPEN position to the CLOSE position.

[0042] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A manual arc valve characterized by: The valve includes a valve body with a valve cavity. The valve body has at least two inlets and outlets communicating with the valve cavity. A rotating shaft is provided inside the valve cavity. The rotating shaft includes an integrally connected shaft portion and an arc-shaped spring piece. The arc-shaped spring piece protrudes radially outward. A sealing diaphragm is provided between the arc-shaped spring piece and the inner wall of the valve cavity. The sealing diaphragm can block the inlets and outlets. The shaft portion extends upward out of the valve body. A valve cover is fitted on the upper end of the shaft portion. The shaft portion and the valve cover are rotatably connected. The outer edge of the valve cover is fixed to the valve body. A rotating seat is provided at the upper end of the shaft portion. A fixed upper cover is provided on the rotating seat. The fixed upper cover restricts the rotating seat to the shaft portion, so that the rotating seat and the rotating shaft can rotate synchronously. The fixed upper cover extends from the upper end of the rotating seat. A rotating handle is connected to the side. An adjusting plug is provided at the bottom of the valve body. The upper end of the adjusting plug extends into the valve cavity and is tapered. The lower end of the arc-shaped spring piece abuts against the tapered surface of the adjusting plug.

2. The manual arc valve as described in claim 1, characterized in that: The valve cover has a raised ring on its inner wall, and a wear-resistant sleeve is provided between the raised ring and the shaft.

3. The manual arc valve as described in claim 2, characterized in that: The wear-resistant sleeve includes an upper wear-resistant sleeve and a lower wear-resistant sleeve. The upper wear-resistant sleeve wraps around the upper part of the convex ring from top to bottom, and the lower wear-resistant sleeve wraps around the lower part of the convex ring from bottom to top.

4. The manual arc valve as described in claim 1, characterized in that: The upper end of the shaft is provided with an anti-rotation part, and the lower end face of the rotating seat is provided with an anti-rotation groove adapted to the anti-rotation part. During assembly, the anti-rotation part is embedded in the anti-rotation groove, which can limit the relative rotation between the rotating seat and the rotating shaft.

5. The manual arc valve as described in claim 1, characterized in that: The arc-shaped spring sheet has a protrusion at the contact position with the sealing diaphragm, and the protrusion is interference-fitted with the sealing diaphragm.

6. The manual arc valve as described in claim 1, characterized in that: It also includes a locking nut, a connecting sleeve at the lower end of the valve body, an adjusting plug inside the connecting sleeve, an external thread on the outer wall of the connecting sleeve, and a locking nut threaded onto the connecting sleeve to lock the adjusting plug onto the valve body.

7. The manual arc valve as described in claim 1, characterized in that: It also includes a sealing structure, which includes a first O-ring, a second O-ring, and a third O-ring. The first O-ring is disposed between the valve cover and the shaft and is located below the wear-resistant sleeve to achieve a seal between the valve cover and the shaft. The second O-ring is disposed between the connecting surfaces of the valve cover and the valve body to achieve a seal between the valve cover and the valve body. The third O-ring is disposed between the connecting surfaces of the valve body and the adjusting plug to achieve a seal between the valve body and the adjusting plug.

8. The manual arc valve as described in claim 1, characterized in that: The rotating handle includes a rotating rod and a handle. One end of the rotating rod is threaded onto the rotating seat, and the other end extends radially and is connected to the handle.

9. The manual arc valve as described in claim 1, characterized in that: The outer edge of the fixed top cover and the upper end of the valve cover are provided with matching threaded holes. The fixed top cover and the valve cover are fixed by connecting them in the threaded holes with external hexagonal bolts.

10. The manual arc valve as described in claim 1, characterized in that: The outer edge of the valve cover and the upper end of the valve body are provided with matching threaded holes, and the valve cover and the valve body are fixed by connecting them in the threaded holes with external hexagonal bolts.

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