Swing arm type orifice plate valve and method

Abstract

The invention relates to the technical field of pipeline valves, in particular to a swing arm type pore plate valve and a method, the swing arm type pore plate valve comprises a valve body, a valve element and a driving assembly, a spigot with a certain depth is formed in the valve body in the water flow direction, and a throttling hole is formed in the inner bottom face of the spigot; the valve element is arranged in the spigot and makes close contact with the inner bottom face of the spigot, a flow passing groove is formed in the valve element, and when the valve element rotates relative to the valve body, the flow passing groove and the throttling hole are in any one of the non-overlapping state, the local overlapping state and the complete overlapping state. The driving assembly is arranged on the valve body and used for driving the valve element to rotate relative to the valve body, and the rotating direction of the valve element is perpendicular to the water flow direction. The flow area of the orifice valve is adjusted through relative movement of the valve element and the throttling hole, so that the purpose of controlling the flow and pressure of a pipeline is achieved, and adjustment is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline valves, and in particular to a swing arm type orifice valve and a method. Background Art

[0002] In the pipeline system, valves are key components for controlling fluid flow, and their performance directly affects the operating efficiency, stability and safety of the entire system. With the continuous advancement of industrial technology and the increasing diversification of fluid control needs, traditional valves are facing more and more challenges in flow regulation, pressure control and corrosion resistance. Especially in the water treatment, petrochemical, pharmaceutical, food processing and other industries, higher requirements are placed on the precise control, high efficiency and energy saving of valves and convenient maintenance.

[0003] Traditional flow control valves, such as stop valves and regulating valves, can control fluid flow to a certain extent, but they often have problems such as low adjustment accuracy, large fluid resistance, easy clogging, and difficult maintenance. Especially in situations where precise flow adjustment is required, the performance of traditional valves is often difficult to meet the requirements. In addition, these valves are often accompanied by large energy losses during the adjustment process, which is not conducive to energy conservation and emission reduction of the system.

[0004] In the field of fluid control, orifice valves are a common flow and pressure regulating device, widely used in water supply and drainage systems, HVAC systems, chemical processes, oil and gas transportation, food processing and other industries. Traditional orifice valves mainly control the amount of fluid passing through by fixing the gap between the orifice plate and the valve seat, thereby achieving the regulation of the flow and pressure in the pipeline. However, this design has many shortcomings, such as limited adjustment range, low adjustment accuracy, difficult to ensure sealing performance, and complex maintenance and replacement. Among them, first, the adjustment range of traditional orifice valves is limited. Since the gap between the orifice plate and the valve seat is fixed, once the installation is completed, its flow area is difficult to change, resulting in the valve being unable to cope with the flow and pressure regulation requirements under different working conditions. Especially in situations where precise control of fluid flow is required, traditional orifice valves often cannot meet the requirements. Secondly, the adjustment accuracy of traditional orifice valves is not high. Since the sealing performance between the orifice plate and the valve seat is affected by many factors, such as processing accuracy, material properties, fluid characteristics, etc., the flow and pressure regulation accuracy of the valve is often difficult to meet the design requirements during actual use. This not only affects the overall performance of the system, but may also cause safety accidents. Furthermore, the sealing performance of traditional orifice valves is difficult to guarantee. After long-term use, due to fluid erosion, corrosion and wear, the sealing performance between the orifice and the valve seat will gradually decrease, resulting in fluid leakage. This not only wastes resources, but may also pollute the environment and even pose a threat to equipment and personnel safety. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a swing arm orifice valve and method that has a compact structure, flexible adjustment, good sealing performance, wear resistance and durability, and is easy to install and maintain. The present invention adjusts the flow area of ​​the orifice valve through the relative movement of the valve core and the throttle hole, thereby achieving precise control of the flow and pressure in the pipeline and convenient adjustment. This design not only broadens the adjustment range of the valve and improves the adjustment accuracy, but also improves the sealing performance and reduces the difficulty of maintenance and replacement. It solves the problems existing in traditional orifice valves, meets the flow and pressure regulation requirements under different working conditions, and improves the overall performance and safety of the system.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A swing arm type orifice valve, comprising:

[0008] A valve body, wherein a stopper of a certain depth is arranged on the valve body along the water flow direction, and a throttling hole is opened on the inner bottom surface of the stopper;

[0009] A valve core, the valve core is built into the stop and in close contact with the inner bottom surface thereof, a flow groove is provided on the valve core, when the valve core rotates relative to the valve body, the flow groove and the throttle hole are in any one of a non-overlapping, partially overlapping, and completely overlapping state;

[0010] And a driving component, wherein the driving component is arranged on the valve body, and the driving component is used to drive the valve core to rotate relative to the valve body, and the rotation direction of the valve core is perpendicular to the water flow direction.

[0011] As a further optimization scheme of the present invention, the valve body includes a main valve body and an auxiliary valve body that are detachably connected, the stop includes a first stop arranged on the main valve body and a second stop passing through the auxiliary valve body, the throttle hole is arranged on the inner bottom surface of the first stop, and the inner bottom surface of the first stop is in close contact with the end face of the valve core.

[0012] As a further optimization solution of the present invention, the inner bottom surface of the first stop is a plane, the diameter of the first stop is the same as the diameter of the second stop, and the depth of the first stop is less than the depth of the second stop.

[0013] As a further optimization scheme of the present invention, the driving assembly includes a lifting mechanism and a driving handle. The lifting mechanism is arranged on the valve body through a clamping plate. One end of the driving handle is connected to the driving end of the lifting mechanism, and the other end is embedded in the interior of the valve body and connected to the valve core. A notch is provided on the valve body for the driving handle to swing.

[0014] As a further optimization scheme of the present invention, the lifting mechanism includes a lifting rod, a handwheel and a copper nut. The copper nut is embedded in a slot on the card plate and is limited by it. The handwheel is arranged at the top of the copper nut and is used to drive the copper nut to rotate horizontally relative to the card plate. The lifting rod passes through the middle of the copper nut and is threadedly connected to it. The lower end of the lifting rod is rotatably connected to the driving handle.

[0015] As a further optimization solution of the present invention, a sealing groove is arranged on the outer circumferential surface of the valve core, and a sealing ring is arranged in the sealing groove.

[0016] As a further optimization scheme of the present invention, a clearance fit is adopted between the outer cylindrical surface of the valve core and the inner side wall of the stop, and the surface roughness reaches Ra3.2um or higher.

[0017] As a further optimization scheme of the present invention, the swing arm type orifice valve also needs to satisfy the following relationship:

[0018] F>B, and B+C>F+E;

[0019] Among them, B is the depth of the first stop, C is the depth of the notch, E is the thickness of the driving handle, and F is the thickness of the bosses on the left and right sides of the driving handle in the direction of water flow.

[0020] As a further optimization scheme of the present invention, the roughness of the inner bottom surface of the first stop is Ra0.8um or higher; the roughness of the end surfaces on both sides of the valve core is Ra0.8um or higher.

[0021] As a further optimization scheme of the present invention, a plurality of flow grooves are evenly distributed around the center of the valve core, and a throttle hole area with the same number as the flow grooves is evenly distributed around the center of the inner bottom surface of the stop. The relationship between the number S of the flow grooves and the throttle hole area and the angle ∠D of the notch on the valve body is as follows:

[0022] S≤180° / ∠D.

[0023] A method for flow regulation using the swing arm orifice valve comprises the following steps:

[0024] Rotate the handwheel to drive the valve core to rotate in the stop of the valve body through the drive assembly;

[0025] By adjusting the rotation angle of the valve core, the relative position of the flow groove on the valve core and the throttle hole on the valve body is adjusted, thereby changing the coverage area of ​​the flow groove on the throttle hole, thereby achieving precise regulation of the water flow rate.

[0026] The method can achieve precise regulation of the flow rate of the swing arm type orifice valve through a simple hand wheel rotation operation, and has the advantages of simple operation, flexible regulation and high control accuracy.

[0027] Compared with the prior art, the swing arm orifice valve of the present invention has the following significant advantages and beneficial effects:

[0028] 1. The swing arm structure of the present invention makes the overall structure of the valve more compact and convenient for installation and maintenance. At the same time, the present invention drives the lifting rod to move up and down through the driving assembly, thereby driving the driving handle connected to the lower end of the lifting rod to move up and down. Under the restriction of the valve body, the valve core is driven by the driving handle to rotate relative to the valve body to change the overlapping area of ​​the flow groove and the throttling hole, thereby realizing the change of pressure and flow in the pipeline, that is, the flow area of ​​the orifice valve of the present invention is adjusted by the relative movement of the valve core and the throttling hole, thereby achieving the purpose of accurately controlling the pipeline flow and pressure, and the adjustment process is flexible and stable.

[0029] 2. The unique drive mechanism design ensures that when the handwheel is not driven by external force, the valve core cannot drive the valve stem to move even if it is rotated by external force, thus achieving good self-locking performance. This design improves the safety and reliability of the valve and prevents the valve from being accidentally opened or closed due to external factors.

[0030] 3. High-precision clearance fit and high-quality sealing rings are used between the main valve body, auxiliary valve body and valve core to ensure the sealing performance of the valve in the closed state. This design effectively reduces the waste of water resources and the risk of leakage, and protects the environment and equipment safety.

[0031] 4. By adjusting the specific form of the throttle hole on the valve body and the flow groove on the valve core, a wide range of flow and pressure regulation can be achieved. This flexibility enables the valve to adapt to the use requirements under different working conditions and improves the applicability and practicality of the valve.

[0032] 5. The main parts such as valve body, auxiliary valve body and valve core are made of stainless steel, which has good wear resistance and corrosion resistance. This material selection prolongs the service life of the valve, reduces the frequency of replacement and maintenance, and saves costs.

[0033] 6. The overall structure of the valve is reasonably designed and easy to disassemble and assemble. This design reduces the difficulty and cost of installation and maintenance and improves work efficiency.

[0034] 7. This valve is suitable for various piping systems that need to regulate water flow and pressure, such as water supply and drainage systems, HVAC systems, chemical processes, etc. Its wide applicability makes this valve have important application value in many fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a front structural schematic diagram of the swing arm type orifice valve of the present invention.

[0036] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0037] Figure 3 It is a front structural schematic diagram of the main valve body of the present invention.

[0038] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the BB direction.

[0039] Figure 5 It is a front structural schematic diagram of the auxiliary valve body of the present invention.

[0040] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure along the CC direction.

[0041] Figure 7 yes Figure 5 Schematic diagram of the cross-sectional structure along the DD direction.

[0042] Figure 8 It is a front structural schematic diagram of the valve core and the driving handle of the present invention.

[0043] Fig. 9 yes Figure 8 Schematic diagram of the cross-sectional structure along the EE direction.

[0044] Fig.10 It is a schematic diagram of the water flow principle structure when the valve is opened.

[0045] Fig.11 It is a schematic diagram of the state structure of the valve core and the throttle hole at different valve openings.

[0046] Figure numerals: 1. valve body; 101. stop; 102. throttle hole; 103. main valve body; 104. auxiliary valve body; 105. first stop; 106. second stop; 107. notch; 2. valve core; 201. flow groove; 202. sealing groove; 203. sealing ring; 204. boss; 3. drive assembly; 301. lifting mechanism; 302. drive handle; 303. lifting rod; 304. handwheel; 305. copper nut; 306. slot; 307. pin hole; 308. cotter pin; 4. clamping plate. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for exemplary description and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only for exemplary description and cannot be understood as a limitation on this patent.

[0048] The present specific implementation mode aims to describe in detail the swing arm type orifice valve of the present invention and its application in the cone valve, and further illustrate its structural composition, working principle and technical features in the preferred embodiment.

[0049] like Figure 1 and Figure 2 As shown, a swing arm type orifice valve mainly includes a valve body 1, a valve core 2 and a drive assembly 3.

[0050] In some examples, the valve body 1 is composed of a main valve body 103 and an auxiliary valve body 104 made of stainless steel. The valve body 1 can be rectangular or circular, and is provided with bolt holes on the periphery for connection with a pipeline flange. The main valve body 103 and the auxiliary valve body 104 are detachably connected by screws or other fasteners.

[0051] Specifically, Figure 3 and Figure 4 As shown, the main valve body 103 is processed with a first stop 105, which has a certain depth B, and its inner bottom surface is a plane, and the roughness reaches Ra0.8um or higher to ensure sealing performance. On the inner bottom surface of the first stop 105, there are multiple throttle holes 102 evenly distributed, and these throttle holes 102 are equally divided around the center, and the number of portions is determined according to actual needs. The end face of the main valve body 103 has a threaded hole for connecting with the auxiliary valve body 104; the top has a threaded hole for connecting with the clamping plate 4.

[0052] Specifically, Figure 5-Figure 7 As shown, the auxiliary valve body 104 is processed with a second stop 106 that matches the main valve body 103. The second stop 106 runs through the auxiliary valve body 104, and its diameter is the same as the first stop 105, but its depth is slightly greater than the depth B of the first stop 105 to accommodate the valve core 2. The end face of the auxiliary valve body 104 is provided with a countersunk hole for connecting with the main valve body 103 by screws to ensure that the two are tightly combined. The top of the auxiliary valve body 104 has a threaded hole for connecting with the clamping plate 4. The auxiliary valve body 104 is processed with a notch 107 on the plane in contact with the valve body 1, with an angle of ∠D and a depth of C. The notch 107 is used to accommodate the driving handle 302 and provide it with a movable space.

[0053] In some examples, such as Figure 8 and Fig. 9 As shown, the valve core 2 is a grinding disc-shaped structure made of stainless steel, and its outer cylindrical surface is clearance-matched with the inner wall of the stop 101, and the surface roughness reaches Ra3.2um or higher to ensure that the valve core 2 can move flexibly inside the main valve body 103 and the auxiliary valve body 104. A plurality of flow grooves 201 are processed in the center of the valve core 2, and these flow grooves 201 are also equally divided around the center, and the number is equal to the number of throttling holes 102. The relationship between the number S of throttling holes 102 and flow grooves 201 and the angle ∠D of the notch 107 is as follows: S≤180° / ∠D, so that the valve can evenly adjust the flow at different openings, improving the accuracy and stability of the adjustment. The specific forms of the throttling holes 102 on the valve body 1 and the flow grooves 201 on the valve core can be adjusted according to the adjustment range of the flow and pressure.

[0054] The two ends of the valve core 2 are provided with bosses 204 matching the diameter of the stop 101, and the thickness F of the bosses 204 is slightly greater than the depth B of the first stop 105, so as to ensure the close contact between the valve core 2 and the main valve body 103 and the auxiliary valve body 104. When the valve body 1 and the valve core 2 are under pressure, the sizes of the bosses 204 between the main valve body 103, the auxiliary valve body 104 and the valve core 2 meet the following relationship: F>B and B+C>F+E; at the same time, the bottom surface roughness of the stop 101 of φA reaches Ra0.8um or higher; the end surface roughness of both sides of the valve core 2 reaches Ra0.8um or higher. Among them, B is the depth of the first stop 105, C is the depth of the notch 107, E is the thickness of the driving handle 302, and F is the thickness of the bosses 204 on the left and right sides of the driving handle 302 in the direction of water flow. The above-mentioned dimensional relationship ensures the correct matching and stable operation between the valve core 2, the driving handle 302 and the valve body 1, and prevents interference and damage between components.

[0055] Specifically, a sealing groove 202 is provided in the middle of the boss 204 of the valve core 2 for installing a sealing ring 203 to improve the sealing performance. At the same time, a driving handle 302 is provided in the middle of the two sealing grooves 202 on the outer circle of the boss 204, and a pin hole 307 is provided at the other end of the driving handle 302 for subsequent connection with the lifting mechanism 301.

[0056] In some examples, the driving assembly 3 is mainly composed of a lifting mechanism 301, a card plate 4 and a driving handle 302. The lifting mechanism 301 includes a lifting rod 303, a hand wheel 304 and a copper nut 305. The copper nut 305 is embedded in a card slot 306 on the card plate 4 and is limited by the card slot 306, and can only rotate and slide horizontally in the card slot 306. The hand wheel 304 is installed on the top of the copper nut 305 to drive the copper nut 305 to rotate.

[0057] Specifically, the lifting rod 303 passes through the middle of the copper nut 305 and is threadedly connected thereto, and the lower end of the lifting rod 303 is rotatably connected to the driving handle 302 through the cotter pin 308. The design that the diameter of the pin hole 307 is larger than the diameter of the cotter pin 308 provides sufficient space for the cotter pin 308 to move in the pin hole 307, so that the driving handle 302 moves up and down more smoothly. The valve body 1 is provided with a notch 107 for the driving handle 302 to swing, and the angle ∠D of the notch 107 determines the maximum swing angle of the valve core 2.

[0058] like Fig.10 As shown, the main valve body 103 and the auxiliary valve body 104 are connected by screws to form a whole, and there is a stopper 101 of φA inside, and the valve core 2 is restricted to rotate only under the constraint of the stopper 101 of φA. At the same time, the main valve body 103, the auxiliary valve body 104 and the valve core 2 are provided with a sealing ring 203 on the cylindrical surface of φA. Therefore, when the three are connected together, the water flow is restricted to pass only through the flow groove 201 inside the valve core 2.

[0059] Based on the above structural design, Fig.11 As shown, a method for flow regulation using a swing arm orifice valve and its working principle are as follows:

[0060] Initial state: In the initial state, the flow groove 201 of the valve core 2 and the throttle hole 102 may be in any state of non-overlapping, partial overlapping or complete overlapping, depending on the initial position of the valve core 2.

[0061] Adjustment process: When the flow or pressure in the pipeline needs to be adjusted, the hand wheel 304 is turned, and the hand wheel 304 drives the copper nut 305 to rotate horizontally in the clamping plate 4. Since the copper nut 305 is threadedly connected to the lifting rod 303, the rotation of the copper nut 305 will be converted into the up and down movement of the lifting rod 303. The lower end of the lifting rod 303 is rotatably connected to the driving handle 302, so the up and down movement of the lifting rod 303 will drive the driving handle 302 to swing in the notch 107 in the valve body 1. Under the restriction of the valve body 1, the swing of the driving handle 302 will be converted into the rotational movement of the valve core 2. The rotation of the valve core 2 will change the overlapping area of ​​the flow slot 201 and the throttling hole 102, thereby adjusting the flow area of ​​the valve and realizing the control of the flow and pressure in the pipeline.

[0062] Flow / pressure regulation: When the throttle hole 102 is completely covered by the flow slot 201, the valve is in a fully open state, and the flow and pressure are maximum; when the throttle hole 102 partially overlaps the flow slot 201, the valve is in a partially open state, and the flow and pressure are reduced. When the throttle hole 102 does not overlap the flow slot 201, the valve is in a closed state, and the flow and pressure are zero. By adjusting the rotation angle of the valve core 2, the flow and pressure can be accurately controlled, that is, the corresponding change in the valve opening, thereby completing the control of the water flow.

[0063] In summary, the swing arm type orifice valve of the present invention shows significant advantages and beneficial effects in terms of compact structure, adjustment flexibility, self-locking performance, sealing performance, adjustment range, wear resistance and durability, ease of installation and maintenance, and adaptability. It is a new type of pipeline valve with high practical value.

[0064] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use a swing arm type orifice valve and method of the present invention, and can produce the positive effects recorded in the present invention.

[0065] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0066] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A swing arm orifice valve, characterized in that: include: A valve body (1), wherein a stopper (101) of a certain depth is arranged on the valve body (1) along the water flow direction, and a throttling hole (102) is opened on the inner bottom surface of the stopper (101); A valve core (2), the valve core (2) being built into the stopper (101) and in close contact with the inner bottom surface thereof, the valve core (2) being provided with a flow groove (201), and when the valve core (2) rotates relative to the valve body (1), the flow groove (201) and the throttle hole (102) are in any one of a non-overlapping, partially overlapping, and completely overlapping state; and a driving component (3), wherein the driving component (3) is arranged on the valve body (1), and the driving component (3) is used to drive the valve core (2) to rotate relative to the valve body (1), and the rotation direction of the valve core (2) is perpendicular to the water flow direction.

2. The swing arm type orifice valve according to claim 1, characterized in that: The valve body (1) comprises a main valve body (103) and an auxiliary valve body (104) which are detachably connected, the stop (101) comprises a first stop (105) arranged on the main valve body (103) and a second stop (106) passing through the auxiliary valve body (104), the throttle hole (102) is arranged on the inner bottom surface of the first stop (105), and the inner bottom surface of the first stop (105) is in close contact with the end surface of the valve core (2).

3. The swing arm type orifice valve according to claim 2, characterized in that: The inner bottom surface of the first stop (105) is a plane, the diameter of the first stop (105) is the same as the diameter of the second stop (106), and the depth of the first stop (105) is smaller than the depth of the second stop (106).

4. The swing arm orifice valve according to claim 1, characterized in that: The driving assembly (3) comprises a lifting mechanism (301) and a driving handle (302); the lifting mechanism (301) is arranged on the valve body (1) via a clamping plate (4); one end of the driving handle (302) is connected to the driving end of the lifting mechanism (301), and the other end is embedded in the valve body (1) and connected to the valve core (2); the valve body (1) is provided with a notch (107) for the driving handle (302) to swing.

5. The swing arm type orifice valve according to claim 4, characterized in that: The lifting mechanism (301) comprises a lifting rod (303), a hand wheel (304) and a copper nut (305); the copper nut (305) is embedded in a slot (306) on the clamping plate (4) and is limited by the slot; the hand wheel (304) is arranged on the top of the copper nut (305) and is used to drive the copper nut (305) to rotate horizontally relative to the clamping plate (4); the lifting rod (303) passes through the middle of the copper nut (305) and is threadedly connected thereto; the lower end of the lifting rod (303) is rotatably connected to the driving handle (302).

6. The swing arm type orifice valve according to claim 1, characterized in that: A sealing groove (202) is provided on the outer circumferential surface of the valve core (2), and a sealing ring (203) is provided in the sealing groove (202).

7. The swing arm type orifice valve according to claim 1, characterized in that: A clearance fit is adopted between the outer cylindrical surface of the valve core (2) and the inner wall of the stop (101), and the surface roughness reaches Ra3.2um or higher.

8. The swing arm type orifice valve according to claim 1, characterized in that: The swing arm orifice valve also needs to satisfy the following relationship: F>B, and B+C>F+E; wherein B is the depth of the first stop, C is the depth of the notch, E is the thickness of the drive handle, and F is the thickness of the bosses on the left and right sides of the drive handle in the direction of water flow; the roughness of the inner bottom surface of the first stop (105) reaches Ra0.8um or higher; the roughness of the end surfaces on both sides of the valve core (2) reaches Ra0.8um or higher.

9. The swing arm type orifice valve according to claim 1, characterized in that: The valve core is provided with a plurality of flow grooves (201) evenly distributed around its center, and the inner bottom surface of the stop (101) is provided with a throttling hole (102) area having the same number as the flow grooves (201) evenly distributed around its center, and the relationship between the number S of the flow grooves (201) and the throttling hole (102) area and the angle ∠D of the notch (107) on the valve body (1) is as follows: S≤180° / ∠D.

10. A method for flow regulation using the swing arm orifice valve according to any one of claims 1 to 9, characterized in that: The following steps are involved: Rotate the handwheel to drive the valve core to rotate in the stop of the valve body through the drive assembly; By adjusting the rotation angle of the valve core, the relative position of the flow groove on the valve core and the throttle hole on the valve body is adjusted, thereby changing the coverage area of ​​the flow groove on the throttle hole, thereby achieving precise regulation of the water flow rate.

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