Anti-cavitation regulating valve with large adjustable ratio

Abstract

The invention discloses an anti-cavitation regulating valve with a large adjustable ratio, and relates to the technical field of regulating valves. The large-adjustable-ratio anti-cavitation adjusting valve comprises a valve body, the valve body comprises a liquid inlet channel, an installation channel and a liquid outlet channel which are sequentially communicated, a main valve seat is installed on the installation channel, a sleeve is installed on the main valve seat, a large-flow anti-cavitation disc is arranged on the sleeve and communicated with the liquid inlet channel, and the liquid outlet channel is communicated with the installation channel. The sleeve is provided with a liquid outlet port communicated with the liquid outlet channel; the sleeve is slidably connected with a valve element assembly, the valve element assembly is provided with a first closing position and a first opening position, and when the valve element assembly moves from the closing position to the first opening position, the large-flow anti-cavitation disc communicates with the liquid outlet port, and the large-flow anti-cavitation disc is gradually opened. An auxiliary valve seat is installed on the inner wall of the valve element assembly, the auxiliary valve seat is provided with a small-flow anti-cavitation disc capable of being communicated with the liquid outlet port, the auxiliary valve seat is slidably connected with a plugging piece, the sleeve is provided with a first flow channel, and the valve element assembly is provided with a second flow channel. The device has a relatively large adjustable ratio.

Description

Technical Field

[0001] This application relates to the technical field of control valves, and in particular, to a large adjustable ratio anti-cavitation control valve. Background Art

[0002] In modern industrial production, as a key device in the control system for changing the fluid flow rate in pipelines, the performance of control valves plays a crucial role in the stability, safety, and efficiency of the entire production system. With the continuous development of industrial technology towards high parameters and large-scale, in fields such as petrochemical, power, and metallurgy, more stringent requirements are imposed on control valves.

[0003] Generally, in many working conditions, especially in complex scenarios with high pressure differences and large flow rate changes, control valves need to have the characteristic of large adjustable ratio to accurately match the flow regulation requirements under different production loads. A large adjustable ratio means that the control valve can accurately control the flow rate within a large range, achieving stable and accurate regulation from extremely small flow rates to relatively large flow rates. This is of great significance for ensuring the continuity and stability of the production process, optimizing product quality, and improving energy utilization efficiency. For example, in petrochemical plants, the reaction process has extremely high requirements for the control accuracy of the material flow rate. The large adjustable ratio characteristic of the control valve can ensure that the materials are accurately transported in the appropriate proportion at different reaction stages, thus guaranteeing the efficient progress of the reaction and the stability of product quality.

[0004] Therefore, how to increase the adjustable ratio is an urgent problem to be solved. Summary of the Invention

[0005] In order to increase the adjustable ratio, this application provides a large adjustable ratio anti-cavitation control valve.

[0006] The large adjustable ratio anti-cavitation control valve provided by this application adopts the following technical solutions: A large adjustable ratio anti-cavitation control valve includes a valve body. The valve body includes a liquid inlet channel, an installation channel, and a liquid outlet channel that are connected in sequence. A main valve seat is installed in the installation channel. A sleeve is installed on the main valve seat. A large flow rate anti-cavitation disc is provided on the sleeve. The large flow rate anti-cavitation disc is communicated with the liquid inlet channel. The sleeve has a liquid outlet port communicated with the liquid outlet channel; The sleeve is slidably connected with a valve core assembly. The valve core assembly has a first closed position and a first open position. When the valve core assembly moves from the first closed position to the first open position, the large flow rate anti-cavitation disc is communicated with the liquid outlet port, and the large flow rate anti-cavitation disc is gradually opened; A secondary valve seat is installed on the inner wall of the valve core assembly. The secondary valve seat is provided with a small-flow anti-cavitation disc that can communicate with the liquid outlet port. A plugging member is slidably connected to the secondary valve seat. The sleeve is provided with a first flow channel, and the valve core assembly is provided with a second flow channel. The plugging member has a second closed position and a second open position. When the plugging member moves from the second closed position to the second open position, the small-flow anti-cavitation disc is communicated with the liquid inlet channel through the first flow channel and the second flow channel, and the small-flow anti-cavitation disc is gradually opened. An actuator assembly is installed on the valve body. The actuator assembly is connected to a valve stem, and the valve stem is fixedly connected to the plugging member. The valve stem has a first position, a second position, and a third position. When the valve stem moves from the first position to the second position, the plugging member moves from the second closed position to the second open position. When the valve stem moves from the second position to the third position, the plugging member drives the valve core assembly to move from the first closed position to the first open position.

[0007] By adopting the above technical solutions, the following operations can be achieved: driving the actuator assembly to drive the valve stem to move; when the valve stem is in the first position, the present application is closed, and the liquid inlet channel and the liquid outlet channel are not communicated; when the valve stem moves from the first position to the second position, the plugging member moves from the second closed position to the second open position, and the liquid inlet channel is communicated with the liquid outlet channel through the first flow channel, the second flow channel, the small-flow anti-cavitation disc, and the liquid outlet port. At this time, as the plugging member moves, the small-flow anti-cavitation disc is gradually opened, and the flow rate increases slightly; when the valve stem moves from the second position to the third position, the plugging member drives the valve core assembly to move from the first closed position to the first open position. At this time, the liquid inlet channel is communicated with the liquid outlet channel through the large-flow anti-cavitation disc and the liquid outlet port. At this time, as the plugging member moves, the large-flow anti-cavitation disc is gradually opened, and the flow rate increases significantly. In the present application, through the design of internal and external two-stage flow control and the design of separating and guiding the flow by the small-flow anti-cavitation disc and the large-flow anti-cavitation disc, the flow rate can be very small and very large, which increases the adjustable ratio of the present application.

[0008] Preferably, a plurality of small-flow anti-cavitation discs and a plurality of large-flow anti-cavitation discs are provided. The plurality of small-flow anti-cavitation discs are densely arranged on the secondary valve seat along the moving direction of the plugging member, and the plurality of large-flow anti-cavitation discs are densely arranged on the sleeve along the moving direction of the valve core assembly.

[0009] By adopting the above technical solutions, this design is used to ensure that when the plugging member and the valve core assembly move at a constant speed, the flow rate passing through the plurality of small-flow anti-cavitation discs can change evenly.

[0010] Preferably, the valve core assembly includes a valve core body slidably connected to the inner wall of the sleeve. The valve core body is detachably installed with a pressure sleeve. The pressure sleeve has a stepped portion, and the plugging member has a protruding portion. When the plugging member moves from the second closed position to the second open position, the protruding portion abuts against the stepped portion to drive the stepped portion to move.

[0011] By adopting the above technical solution, when the plugging member moves, the stepped portion can drive the protruding portion to move, thereby driving the valve core assembly to move.

[0012] Preferably, a sealing ring is jointly connected between the valve core body and the sleeve.

[0013] Preferably, the plugging member includes a first inclined surface, and the secondary valve seat includes a second inclined surface. When the plugging member is in the second closed position, the first inclined surface is in contact with the second inclined surface; the valve core assembly includes a first inclined surface, and the main valve seat includes a second inclined surface. When the valve core assembly is in the first closed position, the first inclined surface is in contact with the second inclined surface.

[0014] Preferably, a sealing and buffer gasket is jointly connected between the main valve seat and the installation channel, and the thickness direction of the sealing and buffer gasket is the movement direction of the valve stem.

[0015] By adopting the above technical solution, when the valve stem drives the valve core assembly to move from the first open position to the first closed position, the valve core assembly may impact the main valve seat, and the sealing and buffer gasket can buffer it.

[0016] Preferably, the actuating assembly includes an actuator and a valve cover. The valve body includes an installation port at the top. The valve cover is detachably installed on the valve body and closes the installation port, and the actuator is installed on the valve cover.

[0017] By adopting the above technical solution, the valve cover can be disassembled to repair the parts in the installation channel.

[0018] Preferably, the liquid inlet channel is higher than the liquid outlet channel.

[0019] By adopting the above technical solution, it is used to prevent the medium from flowing back.

[0020] In summary, the present invention includes at least one of the following beneficial technical effects: 1. This application can achieve the following operations: driving the actuating component to drive the valve stem to move; when the valve stem is in the first position, this application is closed, and the liquid inlet channel and the liquid outlet channel are not connected; when the valve stem moves from the first position to the second position, the plugging member moves from the second closing position to the second opening position, and the liquid inlet channel is connected to the liquid outlet channel through the first flow channel, the second flow channel, the small-flow cavitation-resistant disc and the liquid outlet port. At this time, as the plugging member moves, the small-flow cavitation-resistant disc is gradually opened, and the flow rate increases slightly; when the valve stem moves from the second position to the third position, the plugging member drives the valve core assembly to move from the first closing position to the first opening position. At this time, the liquid inlet channel is connected to the liquid outlet channel through the large-flow cavitation-resistant disc and the liquid outlet port. At this time, as the plugging member moves, the large-flow cavitation-resistant disc is gradually opened, and the flow rate increases significantly. In this application, through the design of internal and external two-stage flow control and the design of the small-flow cavitation-resistant disc and the large-flow cavitation-resistant disc for differential diversion, the flow rate can be very small or very large, which increases the adjustable ratio of this application; 2. The design of multiple small-flow cavitation-resistant discs and multiple large-flow cavitation-resistant discs is used to ensure that when the plugging member and the valve core assembly move at a constant speed, the flow rate through the multiple small-flow cavitation-resistant discs can change evenly. Description of the Drawings

[0021] Figure 1 is a cross-sectional view of a large-adjustable-ratio cavitation-resistant control valve in an embodiment of this application; Figure 2 is a schematic cross-sectional view of this application when the valve stem is in the first position; Figure 3 is Figure 2 an enlarged view of part A in Figure 4 is Figure 2 an enlarged view of part B in Figure 5 is a schematic cross-sectional view of this application when the valve stem is between the first position and the second position; Figure 6 is a schematic cross-sectional view of this application when the valve stem is between the second position and the third position; Reference numerals in the drawings: 1, valve body; 11, liquid inlet channel; 12, installation channel; 13, liquid outlet channel; 14, actuating component; 141, actuator; 142, valve cover; 143, valve stem; 15, installation port; 2, main valve seat; 21, second inclined surface; 22, sealing buffer gasket; 3, sleeve; 31, large-flow cavitation-resistant disc; 32, liquid outlet port; 33, first flow channel; 4, valve core assembly; 41, valve core body; 411, first inclined surface; 42, compression sleeve; 421, stepped portion; 43, sealing ring; 44, second flow channel; 5, sub-valve seat; 51, small-flow cavitation-resistant disc; 52, second inclined surface; 6, plugging member; 61, diversion gap; 62, first inclined surface; 63, convex portion. Detailed implementation mode

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention 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, so it should not be construed as a limitation to the present invention.

[0024] The embodiment of the present application discloses a large adjustable ratio anti-cavitation control valve, which is used to increase the adjustable ratio. The adjustable ratio refers to the ratio of the maximum flow rate to the minimum flow rate that can be controlled during the operation of the present application.

[0025] Refer to Figure 1 and Figure 2 , a large adjustable ratio anti-cavitation control valve includes a valve body 1. The valve body 1 includes a liquid inlet channel 11, an installation channel 12, and a liquid outlet channel 13 that are connected in sequence from left to right. The liquid inlet channel 11 is higher than the liquid outlet channel 13. Liquid enters the liquid inlet channel 11 and flows out from the liquid outlet channel 13 through the installation channel 12. A main valve seat 2 is installed in the installation channel 12. A sleeve 3 is installed at the upper end of the main valve seat 2. The sleeve 3 is vertically arranged. The sleeve 3 is provided with large flow rate anti-cavitation discs 31. Specifically, a plurality of large flow rate anti-cavitation discs 31 are arranged densely along the vertical direction on the sleeve 3. The large flow rate anti-cavitation discs 31 are communicated with the liquid inlet channel 11. The sleeve 3 has a liquid outlet port 32 communicated with the liquid outlet channel 13.

[0026] Refer to Figure 1 and Figure 2 , a valve core assembly 4 is slidably connected to the inner wall of the sleeve 3. The valve core assembly 4 fits against the inner wall of the sleeve 3. The valve core assembly 4 can move up and down along the inner wall of the sleeve 3. Specifically, the valve core assembly 4 includes a valve core body 41 slidably connected to the inner wall of the sleeve 3. A pressure sleeve 42 is detachably installed on the valve core body 41. The pressure sleeve 42 is annular. The detachable method is, for example, screw connection. In order to improve the sealing performance of the connection between the valve core body 41 and the sleeve 3 to prevent liquid leakage, a sealing ring 43 is jointly connected between the valve core body 41 and the sleeve 3. The material of the sealing ring 43 is, for example, an O-shaped sealing ring 43. The valve core assembly 4 has a first closed position and a first open position. The first closed position is lower than the first open position.

[0027] When the spool assembly 4 is in the first closed position, multiple large-flow cavitation-resistant discs 31 are blocked by the spool body 41; when the spool assembly 4 moves from the first closed position to the first open position, the large-flow cavitation-resistant discs 31 communicate with the liquid outlet port 32, and the liquid entering the liquid inlet passage 11 from the outside will reach the liquid outlet passage 13 through the multiple large-flow cavitation-resistant discs 31 and the liquid outlet port 32; and as the spool assembly 4 moves upward, the large-flow cavitation-resistant discs 31 will be gradually opened, and the flow rate will gradually increase significantly.

[0028] Referring to Figure 1 and Figure 2 , in addition, when the spool assembly 4 is in the first closed position, the spool body 41 will contact the main valve seat 2 to form a seal to prevent liquid leakage. In order to improve the sealing performance when the spool body 41 contacts the valve seat, combined with Figure 3 , the spool assembly 4 includes a first inclined surface 411, and the main valve seat 2 includes a second inclined surface 21. When the spool assembly 4 is in the first closed position, the first inclined surface 411 fits with the second inclined surface 21. Of course, the cooperation design of the first inclined surface 411 and the second inclined surface 21 is also used to prevent the spool body 41 from over-positioning when moving downward. In addition, when the spool body 41 contacts the main valve seat 2, an impact may occur. In order to reduce the impact, a sealing buffer gasket 22 is jointly connected between the main valve seat 2 and the installation passage 12. The material of the sealing buffer gasket 22 is, for example, rubber, and the thickness direction of the sealing buffer gasket 22 is the movement direction of the spool body 41.

[0029] Referring to Figure 2 and Figure 4 , a sub-valve seat 5 is installed on the inner wall of the spool body 41. The sub-valve seat 5 is annular, the sub-valve seat 5 is located below the compression sleeve 42, and the sub-valve seat 5 is squeezed and fixed on the spool body 41 by the compression sleeve 42. The spool body 41, the sub-valve seat 5 and the compression sleeve 42 can move up and down synchronously. The sub-valve seat 5 has small-flow cavitation-resistant discs 51 communicating with the liquid outlet port 32. Specifically, multiple small-flow cavitation-resistant discs 51 are provided, and the multiple small-flow cavitation-resistant discs 51 are densely arranged along the vertical direction on the sub-valve seat 5. A plugging member 6 is slidably connected to the inner wall of the sub-valve seat 5. The plugging member 6 is columnar, the plugging member 6 fits on the inner wall of the sub-valve seat 5 and at the same time the plugging member 6 also slidably fits on the inner wall of the compression sleeve 42. The plugging member 6 can move up and down, and a flow guiding gap 61 for liquid to flow is formed between the plugging member 6 and the compression sleeve 42; the sleeve 3 is provided with a first flow channel 33, and the spool assembly 4 is provided with a second flow channel 44. Both the first flow channel 33 and the second flow channel 44 are horizontally arranged.

[0030] The plugging member 6 has a second closed position and a second open position, and the second closed position is lower than the second open position; when the plugging member 6 is in the second closed position, the valve core assembly 4 is also in the first closed position at this time, and the plugging member 6 closes the diversion gap 61, that is, the multiple small-flow cavitation-resistant disc plates 51 cannot pass through the liquid; when the plugging member 6 moves from the second closed position to the second open position, that is, moves upward, the multiple small-flow cavitation-resistant disc plates 51 will be gradually opened. At this time, the first flow channel 33, the second flow channel 44, the diversion gap 61 and the small-flow cavitation-resistant disc plates 51 are communicated. The small-flow cavitation-resistant disc plates 51 are communicated with the liquid outlet port 32 through the hole in the middle of the auxiliary valve seat 5. The liquid entering the liquid inlet channel 11 will flow into the liquid outlet channel 13 through the first flow channel 33, the second flow channel 44, the diversion gap 61, the small-flow cavitation-resistant disc plates 51 and the liquid outlet port 32 in sequence. And at this time, as the plugging member 6 moves upward, the multiple small-flow cavitation-resistant disc plates 51 are gradually opened, and the flow rate increases slightly.

[0031] Referring to Figure 4 , in order to ensure the reliability of the plugging member 6 to close the flow-through gap, the plugging member 6 includes a first inclined surface 62, and the auxiliary valve seat 5 includes a second inclined surface 52. When the plugging member 6 is in the second closed position, the first inclined surface 62 fits with the second inclined surface 52.

[0032] Referring to Figure 1 and Figure 2 , an actuator assembly 14 is installed on the valve body 1. The actuator assembly 14 includes an actuator 141 and a valve cover 142. The valve body 1 includes a mounting port 15 at the top. The valve cover 142 is installed on the valve body 1 through screws and closes the mounting port 15. The actuator 141 is installed on the valve cover 142. The actuator 141 is connected with a valve rod 143. The actuator 141 needs to be able to drive the valve rod 143 to move up and down. The actuator 141 is, for example, an electric push rod and a hydraulic cylinder. The valve rod 143 is fixedly connected with the plugging member 6, and the valve rod 143 can move up and down synchronously with the plugging member 6. Combining Figure 4 , in addition, in order to enable the plugging member 6 to drive the compression sleeve 42 to move and thus drive the valve core body 41 to move, the compression sleeve 42 has a stepped portion 421, and the plugging member 6 has a convex portion 63. When the plugging member 6 moves from the second closed position to the second open position, the convex portion 63 moves upward and abuts against the stepped portion 421 to drive the stepped portion 421 to move upward.

[0033] Referring to Figure 2 , Figure 5 and Figure 6 and combining Figure 4 , Figure 2 is a cross-sectional schematic view when the valve rod 143 is in the first position, Figure 5 is a cross-sectional schematic view when the valve rod 143 is between the first position and the second position, Figure 6It is a schematic cross-sectional view when the valve stem 143 is located between the second position and the third position. In the present application, the valve stem 143 has a first position, a second position, and a third position from bottom to top.

[0034] When the valve stem 143 is in the first position, the plug 6 is in the second closed position and the valve core assembly 4 is in the first closed position. At this time, the plurality of small-flow anti-cavitation discs 51 and the plurality of large-flow anti-cavitation discs 31 are both closed, and the liquid cannot flow from the liquid inlet passage 11 into the liquid outlet passage 13. When the valve stem 143 moves from the first position to the second position, the plug 6 moves upward. The plug 6 moves from the second closed position to the second open position. The first inclined surface 62 and the second inclined surface 52 change from being in mutual contact to being separated from each other, and the diversion gap 61 is opened. At this time, the liquid entering the liquid inlet passage 11 can flow into the liquid outlet passage 13 through the first flow path 33, the second flow path 44, the diversion gap 61, the small-flow anti-cavitation disc 51, and the liquid outlet port 32. At this time, as the valve stem 143 moves upward, since the number of small-flow anti-cavitation discs 51 being opened is increasing, the flow rate will gradually increase slightly. In this state, the valve core body 41 maintains the closing of the plurality of large-flow anti-cavitation discs 31.

[0035] When the valve stem 143 is in the second position, the upper end of the convex portion 63 contacts the stepped portion 421. When the valve stem 143 moves from the second position to the third position, the convex portion 63 drives the stepped portion 421, that is, the bush 42, to move upward. At this time, the valve core assembly 4 moves upward, and the valve core assembly 4 moves from the first closed position to the first open position. The plurality of large-flow anti-cavitation discs 31 are gradually opened, and the liquid entering the liquid inlet passage 11 can enter the liquid outlet passage 13 through the large-flow anti-cavitation discs 31 and the liquid outlet port 32. At this time, as the valve stem 143 continues to move upward, the number of large-flow anti-cavitation discs 31 being opened is increasing, and the flow rate will gradually increase significantly. It should be noted that: in this embodiment, at this time, the first flow path 33 and the second flow path 44 are staggered, and the communication state between the first flow path 33 and the second flow path 44 ends.

[0036] It should be noted that: the large-flow anti-cavitation discs 31 and the small-flow anti-cavitation discs 51 can be labyrinth discs or circulation counterflow discs. The above types of discs can guide the fluid to reduce the pressure of the fluid and have good anti-cavitation ability. The specific structures of the labyrinth discs and the circulation counterflow discs are both prior arts, so they will not be elaborated here.

[0037] Generally, in the market, in order to meet the characteristics of a large adjustable ratio, the inner diameters of both the sleeve 3 and the valve core are designed to be very large to meet the requirements of large flow rates. To achieve a small flow rate based on this structure, generally, an extremely small movement is output by the actuator part. On the one hand, this movement is difficult to control. On the other hand, this requires extremely high fitting tolerances between the sleeve 3 and the valve core. Under the requirements of large sizes, the manufacturing precision requirements for the sleeve 3 and the valve core are very high. Compared with the prior art, the small-flow anti-cavitation disk 51 in the present application can be designed to be extremely small, so the flow rate can also be correspondingly extremely small.

[0038] The implementation principle of a large-adjustable-ratio anti-cavitation control valve in an embodiment of the present application is as follows: The driving actuator 141 drives the valve stem 143 to move upward. The valve stem 143 moves from the first position to the second position, and the plugging member 6 moves upward. The plugging member 6 moves from the second closed position to the second open position. The first inclined surface 62 and the second inclined surface 52 change from being in mutual contact to being separated from each other, and the diversion gap 61 is opened. The liquid flowing into the liquid inlet channel 11 flows through the first flow channel 33, the second flow channel 44, the diversion gap 61, the small-flow anti-cavitation disk 51, and the liquid outlet port 32 and then flows into the liquid outlet channel 13. The multiple small-flow anti-cavitation disks 51 are gradually opened, and the flow rate gradually increases slightly; the valve stem 143 continues to move from the second position to the third position, and the convex portion 63 drives the stepped portion 421, that is, the bushing 42, to move upward, and the valve core assembly 4 moves upward. The valve core assembly 4 moves from the first closed position to the first open position. The multiple large-flow anti-cavitation disks 31 are gradually opened. The liquid entering the liquid inlet channel 11 enters the liquid outlet channel 13 through the large-flow anti-cavitation disks 31 and the liquid outlet port 32. The multiple large-flow anti-cavitation disks 31 are gradually opened, and the flow rate gradually increases significantly.

[0039] The embodiments of the present specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A large adjustable ratio anti-cavitation control valve, characterized in that: The valve body (1) comprises a liquid inlet channel (11), a mounting channel (12) and a liquid outlet channel (13) which are connected in sequence, the mounting channel (12) being equipped with a main valve seat (2), the main valve seat (2) being equipped with a sleeve (3), the sleeve (3) being provided with a large flow anti-cavitation disc (31), the large flow anti-cavitation disc (31) being connected with the liquid inlet channel (11), and the sleeve (3) being provided with a liquid outlet port (32) connected with the liquid outlet channel (13); The sleeve (3) is slidably connected to a valve core assembly (4), and the valve core assembly (4) has a closed position 1 and an open position 1. When the valve core assembly (4) moves from the closed position 1 to the open position 1, the large flow anti-cavitation disc (31) is connected to the liquid outlet port (32), and the large flow anti-cavitation disc (31) is gradually opened; The inner wall of the valve core assembly (4) is provided with an auxiliary valve seat (5), the auxiliary valve seat (5) is provided with a small flow anti-cavitation disc (51) which can be communicated with the liquid outlet port (32), the auxiliary valve seat (5) is slidably connected with a blocking member (6), the sleeve (3) is provided with a flow channel 1 (33), and the valve core assembly (4) is provided with a flow channel 2 (44); the blocking member (6) has a closed position 2 and an open position 2, when the blocking member (6) moves from the closed position 2 to the open position 2, the small flow anti-cavitation disc (51) is communicated with the liquid inlet channel (11) through the flow channel 1 (33) and the flow channel 2 (44), and the small flow anti-cavitation disc (51) is gradually opened; An actuator (14) is installed on the valve body (1), and the actuator (14) is connected to a valve stem (143), and the valve stem (143) is fixedly connected to the sealing member (6); the valve stem (143) has a first position, a second position and a third position, and when the valve stem (143) moves from the first position to the second position, the sealing member (6) moves from the second closing position to the second opening position, and when the valve stem (143) moves from the second position to the third position, the sealing member (6) drives the valve core assembly (4) to move from the first closing position to the first opening position.

2. The large adjustable ratio anti-cavitation regulating valve according to claim 1 is characterized in that: A plurality of the small flow anti-cavitation discs (51) and the large flow anti-cavitation discs (31) are provided. The plurality of the small flow anti-cavitation discs (51) are densely distributed on the auxiliary valve seat (5) along the moving direction of the blocking member (6), and the plurality of the large flow anti-cavitation discs (31) are densely distributed on the sleeve (3) along the moving direction of the valve core assembly (4).

3. The large adjustable ratio anti-cavitation regulating valve according to claim 1 is characterized in that: The valve core assembly (4) comprises a valve core body (41) slidably connected to the inner wall of the sleeve (3); the valve core body (41) is detachably mounted with a compression sleeve (42); the compression sleeve (42) has a step portion (421); the blocking member (6) has a protrusion (63); when the blocking member (6) moves from the second closing position to the second opening position, the protrusion (63) abuts against the step portion (421) to drive the step portion (421) to move.

4. The large adjustable ratio anti-cavitation regulating valve according to claim 3 is characterized in that: The valve core body (41) and the sleeve (3) are connected together with a sealing ring (43).

5. The large adjustable ratio anti-cavitation regulating valve according to claim 1 is characterized in that: The blocking member (6) includes a first slope (62), and the auxiliary valve seat (5) includes a second slope (52). When the blocking member (6) is located in the second closed position, the first slope (62) fits with the second slope (52). The valve core assembly (4) includes a first slope (411), and the main valve seat (2) includes a second slope (21). When the valve core assembly (4) is located in the first closed position, the first slope (411) fits with the second slope (21).

6. The large adjustable ratio anti-cavitation regulating valve according to claim 5 is characterized in that: A sealing buffer gasket (22) is commonly connected between the main valve seat (2) and the installation channel (12), and the thickness direction of the sealing buffer gasket (22) is the movement direction of the valve stem (143).

7. The large adjustable ratio anti-cavitation regulating valve according to claim 1 is characterized in that: The actuator assembly (14) comprises an actuator (141) and a valve cover (142); the valve body (1) comprises a mounting opening (15) at the top; the valve cover (142) is detachably mounted on the valve body (1) and closes the mounting opening (15); and the actuator (141) is mounted on the valve cover (142).

8. The large adjustable ratio anti-cavitation regulating valve according to claim 1 is characterized in that: The liquid inlet channel (11) is higher than the liquid outlet channel (13).

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