Swing arm type orifice plate valve

Abstract

The utility model relates to the technical field of pipeline valves, in particular to a swing arm type pore plate valve, which comprises a valve body, a valve core and a driving component, the valve body is provided with a seam allowance with a certain depth along the water flow direction, and the inner bottom surface of the seam allowance is provided with a throttling hole; 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 flow and pressure of a pipeline is achieved, and adjustment is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline valves, and particularly relates to a swing-arm orifice valve. Background Art

[0002] In a pipeline system, as a key component for controlling fluid flow, the performance of a valve directly affects the operation efficiency, stability, and safety of the entire system. With the continuous progress of industrial technology and the increasingly diverse requirements for fluid control, traditional valves are facing more and more challenges in aspects such as flow regulation, pressure control, and corrosion resistance. Especially in industries such as water treatment, petrochemical, pharmaceutical, and food processing, higher requirements are put forward for the precise control, energy efficiency, and maintenance convenience of valves.

[0003] Traditional flow regulating valves, such as globe valves, regulating valves, etc., although they can achieve a certain degree of control over fluid flow, often have problems such as low regulation accuracy, large fluid resistance, easy blockage, and difficult maintenance. Especially in occasions where precise flow regulation is required, the performance of traditional valves often fails to meet the requirements. In addition, during the regulation process of these valves, there is often a large amount of energy loss, which is not conducive to the energy conservation and emission reduction of the system.

[0004] In the field of fluid control, as a common flow and pressure regulating device, the orifice valve is widely used in multiple industries such as water supply and drainage systems, heating ventilation systems, chemical processes, oil and gas transportation, and food processing. Traditional orifice valves mainly control the fluid throughput by the gap between the fixed orifice plate and the valve seat, thereby achieving the regulation of flow and pressure in the pipeline. However, this design has many deficiencies, such as limited regulation range, low regulation accuracy, difficult-to-guarantee sealing performance, and complex maintenance and replacement. First of all, the regulation range of traditional orifice valves is limited. Since the gap between the orifice plate and the valve seat is fixed, once installed, 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 occasions where precise control of fluid flow is required, traditional orifice valves often cannot meet the requirements. Secondly, the regulation accuracy of traditional orifice valves is not high. Due to the sealing performance between the orifice plate and the valve seat being affected by various factors such as machining accuracy, material properties, and fluid characteristics, in actual use, the flow and pressure regulation accuracy of the valve often fails to reach the design requirements. This not only affects the overall performance of the system but also may cause safety accidents. Moreover, the sealing performance of traditional orifice valves is difficult to guarantee. After long-term use, due to reasons such as fluid erosion, corrosion, and wear, the sealing performance between the orifice plate and the valve seat will gradually decline, resulting in fluid leakage. This not only wastes resources but also may cause environmental pollution and even pose a threat to the safety of equipment and personnel. Summary of the Invention

[0005] Aiming at the deficiencies in the existing technology, the purpose of the present utility model is to provide a swing-arm orifice valve with a compact structure, flexible adjustment, good sealing performance, wear resistance and durability, and easy installation and maintenance. The present utility model adjusts the flow area of the orifice valve through the relative movement of the valve core and the throttle hole, thereby realizing the precise control of the flow rate and pressure in the pipeline, and the adjustment is convenient. This design not only broadens the adjustment range of the valve, improves the adjustment accuracy, but also improves the sealing performance and reduces the difficulty of maintenance and replacement. It solves the problems existing in the traditional orifice valve, meets the flow rate and pressure adjustment requirements under different working conditions, and improves the overall performance and safety of the system.

[0006] To achieve the above object, the present utility model adopts the following technical solutions:

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

[0008] A valve body, on which a rabbet with a certain depth is arranged along the water flow direction, and a throttle hole is opened on the inner bottom surface of the rabbet;

[0009] A valve core, which is placed inside the rabbet and is in close contact with its inner bottom surface. An overflow groove is opened on the valve core. When the valve core rotates relative to the valve body, the overflow groove and the throttle hole are in any one of the states of non-overlap, partial overlap, and complete overlap;

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

[0011] As a further optimized solution of the present utility model, the valve body includes a main valve body and a sub-valve body which are detachably connected. The rabbet includes a first rabbet arranged on the main valve body and a second rabbet penetrating through the sub-valve body. The throttle hole is arranged on the inner bottom surface of the first rabbet, and the inner bottom surface of the first rabbet is in close contact with the end face of the valve core.

[0012] As a further optimized solution of the present utility model, the inner bottom surface of the first rabbet is a plane, the diameter of the first rabbet is the same as that of the second rabbet, and the depth of the first rabbet is less than the depth of the second rabbet.

[0013] As a further optimized solution of the present utility model, 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 inside the valve body and connected to the valve core; a notch for the driving handle to swing is arranged on the valve body.

[0014] As a further optimized solution of the present utility model, the lifting mechanism includes a lifting rod, a handwheel and a copper nut. The copper nut is embedded in the card slot on the card board and is limited by it. The handwheel is arranged on the top of the copper nut and is used to drive the copper nut to rotate horizontally relative to the card board. 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 optimized solution of the present utility model, a sealing groove is arranged on the outer cylindrical surface of the valve core, and a sealing ring is arranged in the sealing groove.

[0016] As a further optimized solution of the present utility model, 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 optimized solution of the present utility model, the swing-arm orifice valve also needs to satisfy the following relationship:

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

[0019] Wherein, 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 both sides of the driving handle in the water flow direction.

[0020] As a further optimized solution of the present utility model, the roughness of the inner bottom surface of the first stop reaches Ra0.8um or higher; the roughness of the two end faces of the valve core reaches Ra0.8um or higher.

[0021] As a further optimized solution of the present utility model, a plurality of flow-through grooves are evenly distributed around the center of the valve core. A throttling hole area with the same number as the flow-through grooves is evenly distributed around the center of the inner bottom surface of the stop. The relationship between the number S of the flow-through grooves and the throttling hole area and the angle ∠D of the notch on the valve body is as follows:

[0022] S ≤ 180° / ∠D.

[0023] Compared with the prior art, the swing-arm orifice valve of the present utility model has the following several remarkable advantages and beneficial effects:

[0024] 1. The swing-arm structure of the present utility model makes the overall structure of the valve more compact, facilitating installation and maintenance. Meanwhile, the present utility model drives the lifting rod to move up and down through the driving component, 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 makes a rotational movement relative to the valve body driven by the driving handle, so as to change the overlapping area between the flow-through groove and the throttling hole, thereby realizing the change of the pressure and flow rate in the pipeline, that is, adjusting the flow area of the orifice valve of the present utility model through the relative movement of the valve core and the throttling hole, so as to achieve the purpose of accurately controlling the pipeline flow rate and pressure, and the adjustment process is flexible and stable.

[0025] 2. The unique design of the driving mechanism enables the valve stem not to be driven to move even if the valve core is rotated by an external force when the handwheel is not driven by an external force, realizing good self-locking performance. This design improves the safety and reliability of the valve and prevents the accidental opening or closing of the valve caused by external factors.

[0026] 3. High-precision clearance fit and high-quality sealing rings are adopted between the main valve body, the auxiliary valve body and the valve core, ensuring the sealing performance of the valve in the closed state. This design effectively reduces the waste of water resources and the risk of leakage, protecting the environment and equipment safety.

[0027] 4. By adjusting the specific forms of the throttling holes on the valve body and the flow-through grooves on the valve core, a wide range of coverage of the flow rate and pressure adjustment range can be achieved. This flexibility enables the valve to adapt to the usage requirements under different working conditions, improving the applicability and practicality of the valve.

[0028] 5. The main components such as the valve body, the auxiliary valve body and the valve core are all made of stainless steel, having good wear resistance and corrosion resistance. This material selection extends the service life of the valve, reduces the frequency of replacement and maintenance, and saves costs.

[0029] 6. The overall structure of the valve is reasonably designed, facilitating disassembly and assembly. This design reduces the difficulty and cost of installation and maintenance, and improves work efficiency.

[0030] 7. This valve is applicable to various pipeline systems that need to adjust the water flow rate and pressure, such as water supply and drainage systems, heating and ventilation systems, chemical processes, etc. Its wide applicability makes this valve have important application value in multiple fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the front structural schematic diagram of the swing-arm orifice valve of the present utility model.

[0032] Figure 2 is Figure 1 the sectional structural schematic diagram in the A-A direction in

[0033] Figure 3It is a front structural schematic diagram of the main valve body of the present utility model.

[0034] Figure 4 It is Figure 3 a sectional structural schematic diagram in the B-B direction in

[0035] Figure 5 It is a front structural schematic diagram of the auxiliary valve body of the present utility model.

[0036] Figure 6 It is Figure 5 a sectional structural schematic diagram in the C-C direction in

[0037] Figure 7 It is Figure 5 a sectional structural schematic diagram in the D-D direction in

[0038] Figure 8 It is a front structural schematic diagram of the valve core and the driving handle of the present utility model.

[0039] Figure 9 It is Figure 8 a sectional structural schematic diagram in the E-E direction in

[0040] Figure 10 It is a structural schematic diagram of the water flow principle when the valve is opened.

[0041] Figure 11 It is a structural schematic diagram of the states of the valve core and the throttle hole at different valve openings of the valve.

[0042] Reference numerals: 1. Valve body; 101. Stopping mouth; 102. Throttle hole; 103. Main valve body; 104. Auxiliary valve body; 105. First stopping mouth; 106. Second stopping mouth; 107. Notch; 2. Valve core; 201. Flow-through groove; 202. Sealing groove; 203. Sealing ring; 204. Boss; 3. Driving assembly; 301. Lifting mechanism; 302. Driving handle; 303. Lifting rod; 304. Handwheel; 305. Copper nut; 306. Card slot; 307. Pin hole; 308. Split pin; 4. Card plate. Detailed implementation manners

[0043] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the preferred implementation solutions of the present utility model will be described below in conjunction with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be construed as a limitation to this patent; in order to better illustrate this embodiment, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions 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 relationships described in the drawings are only for illustrative purposes and cannot be construed as a limitation to this patent.

[0044] This specific implementation is intended to describe in detail the swing-arm orifice valve of the present utility model and its application in the cone valve, further clarifying its structural composition, working principle, and technical features in the preferred embodiments.

[0045] As Figure 1 and Figure 2 shown, a swing-arm orifice valve mainly includes a valve body 1, a valve core 2, and a driving assembly 3.

[0046] In some examples, the valve body 1 is composed of a main valve body 103 and a sub-valve body 104 made of stainless steel. The shape of the valve body 1 can be rectangular or circular, and bolt holes are provided on the periphery for connecting with the pipeline flange. The main valve body 103 and the sub-valve body 104 are detachably connected by screws or other fasteners.

[0047] Specifically, as Figure 3 and Figure 4 shown, a first stop 105 is machined on the main valve body 103. The first stop 105 has a certain depth B, its inner bottom surface is flat, and the roughness reaches Ra0.8um or higher to ensure the sealing performance. On the inner bottom surface of the first stop 105, a plurality of throttle holes 102 are evenly distributed. These throttle holes 102 are equally divided around the center, and the number of parts is determined according to actual requirements. There are threaded holes on the end face of the main valve body 103 for connecting with the sub-valve body 104; there are threaded holes on its top for connecting with the clamping plate 4.

[0048] Specifically, as Figures 5 - 7 shown, a second stop 106 matching the main valve body 103 is machined on the sub-valve body 104. The second stop 106 penetrates the sub-valve body 104, and its diameter is the same as that of the first stop 105, but the depth is slightly greater than the depth B of the first stop 105 to accommodate the valve core 2. There are counterbored holes on the end face of the sub-valve body 104 for connecting with the main valve body 103 by screws to ensure their tight combination. There are threaded holes on the top of the sub-valve body 104 for connecting with the clamping plate 4. A notch 107 is machined on the plane of the sub-valve body 104 in contact with the valve body 1, with an angle of ∠D and a depth of C. This notch 107 is used to accommodate the driving handle 302 and provide space for its movement.

[0049] In some examples, as Figure 8 and Figure 9As shown, the valve core 2 is in the shape of a grinding disc and is made of stainless steel. The outer cylindrical surface of the valve core 2 has a clearance fit with the inner side wall of the stop 101, and the surface roughness reaches Ra3.2um or higher to ensure that the valve core 2 moves flexibly inside the main valve body 103 and the sub-valve body 104. Multiple flow-through grooves 201 are machined in the center of the valve core 2. These flow-through grooves 201 are also equally divided around the center, and the number is equal to the number of throttle holes 102. The relationship between the number of throttle holes 102 and flow-through grooves 201, S, and the included angle ∠D of the notch 107 is as follows: S ≤ 180° / ∠D, enabling the valve to uniformly adjust the flow rate at different opening degrees, improving the accuracy and stability of the adjustment. The specific forms of the throttle holes 102 on the valve body 1 and the flow-through grooves 201 on the valve core can be adjusted according to the adjustment range of the flow rate and pressure.

[0050] Both ends of the valve core 2 are provided with bosses 204 that match the diameter of the stop 101. The thickness F of the boss 204 is slightly greater than the depth B of the first stop 105 to ensure close contact between the valve core 2 and the main valve body 103 and the sub-valve body 104. When the valve body 1 and the valve core 2 are under pressure, the following relationships are satisfied among the dimensions of the bosses 204 between the main valve body 103, the sub-valve body 104, and the valve core 2; F > B and B + C > F + E; at the same time, the surface roughness of the bottom plane of the stop 101 with φA reaches Ra0.8um or higher; the surface roughness of both end faces 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 water flow direction. The above dimensional relationships ensure the correct fit and stable operation among the valve core 2, the driving handle 302, and the valve body 1, preventing interference and damage between components.

[0051] Specifically, a sealing groove 202 is provided in the middle of the boss 204 of the valve core 2 for installing the sealing ring 203 to improve the sealing performance. At the same time, a driving handle 302 is provided at the middle position between the two sealing grooves 202 on the outer circle of the boss 204. The other end of the driving handle 302 is provided with a pin hole 307 for subsequent connection with the lifting mechanism 301.

[0052] In some examples, the driving assembly 3 mainly consists of a lifting mechanism 301, a clamping plate 4, and a driving handle 302. The lifting mechanism 301 includes a lifting rod 303, a handwheel 304, and a copper nut 305. The copper nut 305 is embedded in the card slot 306 on the clamping plate 4 and is limited by the card slot 306, and can only rotate and slide horizontally in the card slot 306. The handwheel 304 is installed on the top of the copper nut 305 for driving the copper nut 305 to rotate.

[0053] Specifically, 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 through a split pin 308. The design that the aperture of the pin hole 307 is larger than the diameter of the split pin 308 provides sufficient space for the movement of the split pin 308 within the pin hole 307, making the driving handle 302 move more smoothly up and down. A notch 107 for the driving handle 302 to swing is provided on the valve body 1, and the angle ∠D of the notch 107 determines the maximum swing angle of the valve core 2.

[0054] As Figure 10 shown, the main valve body 103 and the sub-valve body 104 are connected into an integral body by screws. There is a stop 101 with a diameter of φA inside, and the valve core 2 is restricted to rotate only under the constraint of the stop 101 with a diameter of φA. At the same time, sealing rings 203 are provided on the cylindrical surfaces with a diameter of φA of the main valve body 103, the sub-valve body 104 and the valve core 2. Therefore, when the three are connected together, the water flow is restricted to pass only through the flow-through groove 201 inside the valve core 2.

[0055] Based on the above structural design, as Figure 11 shown, a method and working principle for flow regulation using a swing-arm orifice valve are as follows:

[0056] Initial state: In the initial state, the flow-through groove 201 of the valve core 2 and the throttle hole 102 may be in any one of the states of non-overlap, partial overlap or full overlap, specifically depending on the initial position of the valve core 2.

[0057] Adjustment process: When it is necessary to adjust the flow rate or pressure in the pipeline, rotate the handwheel 304. The handwheel 304 drives the copper nut 305 to rotate horizontally within 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. Therefore, the up and down movement of the lifting rod 303 will drive the driving handle 302 to swing within the notch 107 of 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 between the flow-through groove 201 and the throttle hole 102, thereby adjusting the flow area of the valve and achieving the control of the flow rate and pressure in the pipeline.

[0058] Flow rate / pressure regulation: When the throttle hole 102 is completely covered by the flow-through groove 201, the valve is in the fully open state, and the flow rate and pressure are the maximum; when the throttle hole 102 and the flow-through groove 201 are partially overlapped, the valve is in the partially open state, and the flow rate and pressure are reduced. When there is no overlap between the throttle hole 102 and the flow-through groove 201, the valve is in the closed state, and the flow rate and pressure are zero. By adjusting the rotation angle of the valve core 2, precise control of the flow rate and pressure can be achieved, that is, corresponding to the change in the valve opening, thereby completing the control of the water flow.

[0059] In summary, the swing-arm orifice valve of the present utility model shows significant advantages and beneficial effects in terms of structural compactness, 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.

[0060] Based on the description and drawings of the present utility model, those skilled in the art can easily manufacture or use a swing-arm orifice valve of the present utility model and can achieve the positive effects recorded in the present utility model.

[0061] Unless otherwise specifically stated, in the present utility model, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to describe the orientation or positional relationship in the present utility model are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood by combining the drawings and according to specific circumstances.

[0062] Unless otherwise clearly defined and limited, in the present utility model, if there are terms such as "set", "connected" and "connected", they 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, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0063] The above description is only a preferred embodiment of the present utility model and does not impose any form of limitation on the present utility model. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present utility model falls within the protection scope of the present utility model.

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 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 opening (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 type 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.

9. The swing arm type orifice valve according to claim 8, characterized in that: 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.

10. 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.

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