Large adjustable ratio anti-cavitation control valve

Abstract

The application discloses a large-adjustable-ratio anti-cavitation regulating valve and relates to the technical field of regulating valves. The large-adjustable-ratio anti-cavitation regulating valve comprises a valve body, the valve body comprises a liquid inlet channel, a mounting channel and a liquid outlet channel which are sequentially communicated, the mounting channel is provided with a main valve seat, the main valve seat is provided with a sleeve, the sleeve is provided with a large-flow anti-cavitation disc, the large-flow anti-cavitation disc is communicated with the liquid inlet channel, and the sleeve is provided with 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 closing position one and an opening position one, when the valve core assembly moves from the closing position one to the opening position one, the large-flow anti-cavitation disc is communicated with the liquid outlet port, and the large-flow anti-cavitation disc is gradually opened; a secondary valve seat is arranged on the inner wall of the valve core assembly, the secondary valve seat is provided with a small-flow anti-cavitation disc capable of being communicated with the liquid outlet port, the secondary valve seat is slidably connected with a blocking piece, the sleeve is provided with a flow channel one, and the valve core assembly is provided with a flow channel two. The application has a large adjustable ratio.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of regulating valves, and in particular to a large-adjustable-ratio anti-cavitation regulating valve. BACKGROUND

[0002] In modern industrial production, regulating valves, as key devices for changing the flow of fluid in the pipeline in the control system, their performance plays a crucial role in the stability, safety and efficiency of the entire production system. With the development of industrial technology towards high parameters and large-scale, such as petroleum chemical industry, power, metallurgy and other fields, which puts forward more stringent requirements for regulating valves.

[0003] Generally, in many working conditions, especially in complex scenarios of high pressure difference and large flow change, regulating valves need to have large adjustable ratio characteristics to accurately match the flow regulation requirements under different production loads. Large adjustable ratio means that the regulating valve can accurately control the flow in a large range, from very small flow to large flow, which can ensure the continuity, stability of the production process, and optimize product quality and improve energy utilization, etc. For example, in petroleum chemical plants, the control accuracy of material flow in the reaction process is very high, and the large adjustable ratio of the regulating valve can ensure that the material is accurately delivered in the appropriate proportion at different reaction stages, thereby ensuring the efficient progress of the reaction and the stability of the product quality.

[0004] Therefore, how to increase the adjustable ratio is a problem to be solved. SUMMARY

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

[0006] The large-adjustable-ratio anti-cavitation regulating valve provided by the present application adopts the following technical scheme:

[0007] A large-adjustable-ratio anti-cavitation regulating valve, comprising a valve body, the valve body comprising a liquid inlet channel, a mounting channel and a liquid outlet channel connected in sequence, the mounting channel mounting a main valve seat, the main valve seat mounting a sleeve, the sleeve having a large-flow anti-cavitation disc plate opened thereon, the large-flow anti-cavitation disc plate being in communication with the liquid inlet channel, the sleeve having a liquid outlet port in communication with the liquid outlet channel;

[0008] The sleeve is slidingly connected with a valve core assembly, the valve core assembly having a closed position one and an open position one, when the valve core assembly moves from the closed position one to the open position one, the large-flow anti-cavitation disc plate is in communication with the liquid outlet port, and the large-flow anti-cavitation disc plate is gradually opened;

[0009] The inner wall of the valve core assembly is provided with a secondary valve seat, the secondary valve seat is provided with a small flow anti-cavitation disc capable of communicating with the liquid outlet port, the sleeve is provided with a flow channel one, and the valve core assembly is provided with a flow channel two; the blocking piece has a second closed position and a second open position, and when the blocking piece moves from the second closed position to the second open position, the small flow anti-cavitation disc communicates with the liquid inlet channel through the flow channel one and the flow channel two, and the small flow anti-cavitation disc is gradually opened.

[0010] The valve body is provided with an execution assembly, the execution assembly is connected with a valve rod, and the valve rod is fixedly connected with the blocking piece; the valve rod has a first position, a second position and a third position, when the valve rod moves from the first position to the second position, the blocking piece moves from the second closed position to the second open position, and when the valve rod moves from the second position to the third position, the blocking piece drives the valve core assembly to move from the first closed position to the first open position.

[0011] By adopting the above technical scheme, the following actions can be realized: driving the execution assembly to drive the valve rod to move; when the valve rod is located at the first position, the application is closed, and the liquid inlet channel and the liquid outlet channel are not communicated; when the valve rod moves from the first position to the second position, the blocking piece moves from the second closed position to the second open position, the liquid inlet channel communicates with the liquid outlet channel through the flow channel one, the flow channel two, the small flow anti-cavitation disc and the liquid outlet port, and at this time, with the movement of the blocking piece, the small flow anti-cavitation disc is gradually opened, and the flow is slightly increased; when the valve rod moves from the second position to the third position, the blocking piece drives the valve core assembly to move from the first closed position to the first open position, at this time, the liquid inlet channel communicates with the liquid outlet channel through the large flow anti-cavitation disc and the liquid outlet port, and at this time, with the movement of the blocking piece, the large flow anti-cavitation disc is gradually opened, and the flow is greatly increased. In the application, the design of two-stage flow control inside and outside and the design of distinguishing the flow of the small flow anti-cavitation disc and the large flow anti-cavitation disc can make the flow very small or very large, which increases the adjustable ratio of the application.

[0012] Preferably, the small flow anti-cavitation disc and the large flow anti-cavitation disc are provided with a plurality of small flow anti-cavitation discs, and a plurality of large flow anti-cavitation discs are densely arranged on the sleeve along the movement direction of the valve core assembly.

[0013] By adopting the above technical scheme, the design is used to ensure that the flow through the plurality of small flow anti-cavitation discs can be uniformly changed when the blocking piece and the valve core assembly move at a constant speed.

[0014] Preferably, the valve core assembly comprises a valve core body connected to the inner wall of the sleeve in a sliding manner, and the valve core body is detachably provided with a pressing sleeve; the pressing sleeve has a step portion, and the sealing member has a protruding portion, and when the sealing member moves from the second closing position to the second opening position, the protruding portion abuts against the step portion to drive the step portion to move.

[0015] By using the above technical scheme, when the sealing member moves, the step portion can drive the protruding portion to move, thereby driving the valve core assembly to move.

[0016] Preferably, the valve core body and the sleeve are jointly provided with a sealing ring.

[0017] Preferably, the sealing member comprises a first inclined surface, the auxiliary valve seat comprises a second inclined surface, the first inclined surface abuts against the second inclined surface when the sealing member is located at the second closing position, the valve core assembly comprises a third inclined surface, and the main valve seat comprises a fourth inclined surface, the third inclined surface abuts against the fourth inclined surface when the valve core assembly is located at the first closing position.

[0018] Preferably, a sealing buffer gasket is jointly connected between the main valve seat and the installation channel, and the thickness direction of the sealing buffer gasket is the movement direction of the valve rod.

[0019] By using the above technical scheme, when the valve rod drives the valve core assembly to move from the first opening position to the first closing position, the valve core assembly can collide with the main valve seat, and the sealing buffer gasket can buffer the collision.

[0020] Preferably, the execution assembly comprises an execution member and a valve cover, the valve body comprises a mounting port at the top end, the valve cover is detachably mounted on the valve body and seals the mounting port, and the execution member is mounted on the valve cover.

[0021] By using the above technical scheme, the valve cover can be detached to overhaul the parts in the installation channel.

[0022] Preferably, the liquid inlet channel is higher than the liquid outlet channel.

[0023] By using the above technical scheme, the medium can be prevented from flowing back.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. The application can realize the following actions: driving the execution assembly to move the valve stem; when the valve stem is in the first position, the application is closed, and the inlet channel and the outlet channel are not connected; when the valve stem moves from the first position to the second position, the blocking piece moves from the closed position two to the open position two, the inlet channel is connected with the outlet channel through the flow channel one, the flow channel two, the small-flow anti-cavitation disc and the outlet port, and at this time, with the movement of the blocking piece, the small-flow anti-cavitation disc is gradually opened, and the flow is small in amplitude; when the valve stem moves from the second position to the third position, the blocking piece drives the valve core assembly to move from the closed position one to the open position one, at this time, the inlet channel is connected with the outlet channel through the large-flow anti-cavitation disc and the outlet port, and at this time, with the movement of the blocking piece, the large-flow anti-cavitation disc is gradually opened, and the flow is greatly changed. In the application, the design of two-stage flow control inside and outside and the design of small-flow anti-cavitation disc and large-flow anti-cavitation disc to distinguish the flow direction make the flow very small and very large, which increases the adjustable ratio of the application;

[0026] 2. The design of multiple small-flow anti-cavitation discs and multiple large-flow anti-cavitation discs is used to ensure that the flow through the multiple small-flow anti-cavitation discs can change uniformly when the blocking piece and the valve core assembly move at a uniform speed. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a sectional view of a large adjustable ratio anti-cavitation regulating valve in an embodiment of the application;

[0028] Figure 2 is a sectional view of the application when the valve stem is in the first position;

[0029] Figure 3 is Figure 2 is an enlarged view of part A in

[0030] Figure 4 is Figure 2 is an enlarged view of part B in

[0031] Figure 5 is a sectional view of the application when the valve stem is between the first position and the second position;

[0032] Figure 6 is a sectional view of the application when the valve stem is between the second position and the third position;

[0033] Marked in the drawing: 1, valve body; 11, liquid inlet channel; 12, installation channel; 13, liquid outlet channel; 14, execution assembly; 141, execution piece; 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 anti-cavitation disc; 32, liquid outlet port; 33, flow passage one; 4, valve core assembly; 41, valve core body; 411, first inclined surface; 42, pressing sleeve; 421, step portion; 43, sealing ring; 44, flow passage two; 5, auxiliary valve seat; 51, small-flow anti-cavitation disc; 52, second inclined surface; 6, plugging piece; 61, flow guiding gap; 62, first inclined surface; 63, protruding portion. DETAILED DESCRIPTION

[0034] The application will be further described below in detail in combination with the drawings.

[0035] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0036] The embodiment of the application discloses a large-adjustable-ratio anti-cavitation regulating valve. The large-adjustable-ratio anti-cavitation regulating valve is used for being capable of increasing the adjustable ratio, wherein the adjustable ratio refers to the ratio between the maximum flow and the minimum flow capable of being controlled by the application during the working process.

[0037] Reference Figure 1 and Figure 2 The large-adjustable-ratio anti-cavitation regulating valve comprises a valve body 1, the valve body 1 comprises a liquid inlet channel 11, an installation channel 12 and a liquid outlet channel 13 which are sequentially communicated from left to right, the liquid inlet channel 11 is higher than the liquid outlet channel 13, liquid is introduced into the liquid inlet channel 11 and flows out from the liquid outlet channel 13 through the installation channel 12, the installation channel 12 is provided with a main valve seat 2, the main valve seat 2 is provided with a sleeve 3 at the upper end, the sleeve 3 is vertically arranged, the sleeve 3 is provided with a large-flow anti-cavitation disc 31, specifically, the large-flow anti-cavitation disc 31 is provided with a plurality of large-flow anti-cavitation discs 31 and is densely arranged along the vertical direction, the large-flow anti-cavitation disc 31 is communicated with the liquid inlet channel 11, and the sleeve 3 is provided with a liquid outlet port 32 which is communicated with the liquid outlet channel 13.

[0038] Reference Figure 1 and Figure 2The inner wall of the sleeve 3 is slidably connected with a valve core assembly 4, the valve core assembly 4 is attached to 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, the valve core body 41 is detachably installed with a pressing sleeve 42, the pressing sleeve 42 is annular, and the detachable manner is for example through 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, the valve core body 41 and the sleeve 3 are jointly connected with a sealing ring 43, and the material of the sealing ring 43 is for example O-shaped sealing ring 43. The valve core assembly 4 has a closed position one and an open position one, and the closed position one is lower than the open position one.

[0039] When the valve core assembly 4 is located at the closed position one, the plurality of large-flow anti-cavitation disc plates 31 are closed by the valve core body 41; when the valve core assembly 4 moves from the closed position one to the open position one, the large-flow anti-cavitation disc plates 31 are in communication with the liquid outlet port 32, and the liquid entering the liquid inlet channel 11 from the outside will reach the liquid outlet channel 13 through the plurality of large-flow anti-cavitation disc plates 31 and the liquid outlet port 32; and with the upward movement of the valve core assembly 4, the large-flow anti-cavitation disc plates 31 will be gradually opened, and the flow will be greatly improved.

[0040] Referring to Figure 1 and Figure 2 , in addition, when the valve core assembly 4 is located at the closed position one, the valve core body 41 will be in contact with the main valve seat 2 to form a seal to prevent liquid leakage, and in order to improve the sealing performance when the valve core body 41 is in contact with the valve seat, in combination with Figure 3 , the valve core assembly 4 includes a first inclined surface 411, and the main valve seat 2 includes a second inclined surface 21, when the valve core assembly 4 is located at the closed position one, the first inclined surface 411 is attached to the second inclined surface 21, of course, the cooperation of the first inclined surface 411 and the second inclined surface 21 is also used to prevent the valve core body 41 from moving downward. In addition, when the valve core body 41 contacts the main valve seat 2, impact may occur, in order to be able to slow down the impact, the main valve seat 2 and the installation channel 12 are jointly connected with a sealing buffer pad 22, the material of the sealing buffer pad 22 is for example rubber, and the thickness direction of the sealing buffer pad 22 is the movement direction of the valve core body 41.

[0041] Referring to Figure 2 and Figure 4, the inner wall of the valve core body 41 is provided with a secondary valve seat 5, the secondary valve seat 5 is annular, the secondary valve seat 5 is located below the pressing sleeve 42, the secondary valve seat 5 is fixed on the valve core body 41 by being extruded by the pressing sleeve 42, and the valve core body 41, the secondary valve seat 5 and the pressing sleeve 42 can move up and down synchronously. The secondary valve seat 5 is provided with a small-flow anti-cavitation disc 51 in communication with the liquid outlet port 32. Specifically, the small-flow anti-cavitation disc 51 is provided with a plurality of small-flow anti-cavitation discs 51 which are densely arranged along the vertical direction on the secondary valve seat 5. The inner wall of the secondary valve seat 5 is slidably connected with a blocking piece 6, the blocking piece 6 is columnar, the blocking piece 6 is attached to the inner wall of the secondary valve seat 5 and simultaneously the blocking piece 6 is also slidably attached to the inner wall of the pressing sleeve 42, the blocking piece 6 can move up and down, and a flow guiding gap 61 for the flow of liquid is formed between the blocking piece 6 and the pressing sleeve 42; the sleeve 3 is provided with a flow channel one 33, and the valve core assembly 4 is provided with a flow channel two 44, and the flow channel one 33 and the flow channel two 44 are both horizontally arranged.

[0042] The blocking piece 6 has a second closing position and a second opening position, and the second closing position is lower than the second opening position. When the blocking piece 6 is located at the second closing position, the valve core assembly 4 is also located at the first closing position, and the blocking piece 6 closes the flow guiding gap 61, so that the plurality of small-flow anti-cavitation discs 51 cannot flow liquid. When the blocking piece 6 moves from the second closing position to the second opening position, that is, moves upward, the plurality of small-flow anti-cavitation discs 51 will be gradually opened, at this time, the flow channel one 33, the flow channel two 44, the flow guiding gap 61 and the small-flow anti-cavitation disc 51 are communicated, the small-flow anti-cavitation disc 51 is communicated through the hole in the middle of the secondary valve seat 5 and the liquid inlet channel 11, and the liquid in the liquid inlet channel 11 will flow into the liquid outlet channel 13 in sequence through the flow channel one 33, the flow channel two 44, the flow guiding gap 61, the small-flow anti-cavitation disc 51 and the liquid outlet port 32. And, at this time, with the upward movement of the blocking piece 6, the plurality of small-flow anti-cavitation discs 51 are gradually opened, and the flow rate is slightly increased.

[0043] Referring to Figure 4 , in order to ensure the reliability of the blocking piece 6 in closing the flow gap, the blocking piece 6 comprises an inclined surface one 62, and the secondary valve seat 5 comprises an inclined surface two 52, and when the blocking piece 6 is located at the second closing position, the inclined surface one 62 is attached to the inclined surface two 52.

[0044] Referring to Figure 1 and Figure 2 , the valve body 1 is provided with an execution assembly 14, the execution assembly 14 comprises an execution piece 141 and a valve cover 142, the valve body 1 comprises a mounting port 15 at the top end, the valve cover 142 is mounted on the valve body 1 by screws and closes the mounting port 15, the execution piece 141 is mounted on the valve cover 142, the execution piece 141 is connected with a valve rod 143, the execution piece 141 needs to be able to drive the valve rod 143 to move up and down, the execution piece 141 is for example an electric push rod and a hydraulic cylinder, the valve rod 143 is fixedly connected with the blocking piece 6, and the valve rod 143 can move up and down synchronously with the blocking piece 6. In combination with Figure 4In addition, in order to enable the blocking member 6 to drive the pressing sleeve 42 to move and thus drive the valve core body 41 to move, the pressing sleeve 42 has a stepped portion 421, and the blocking member 6 has a protruding portion 63, when the blocking member 6 moves from the second closing position to the second opening position, the protruding portion 63 moves upward and abuts against the stepped portion 421, thereby driving the stepped portion 421 to move upward.

[0045] With reference to Figure 2 , Figure 5 and Figure 6 in combination with Figure 4 , Figure 2 is a sectional view when the valve rod 143 is located at the first position, Figure 5 is a sectional view when the valve rod 143 is located between the first position and the second position, Figure 6 is a sectional view when the valve rod 143 is located between the second position and the third position. In the present application, the valve rod 143 has the first position, the second position and the third position from bottom to top.

[0046] When the valve rod 143 is located at the first position, the blocking member 6 is located at the second closing position and the valve core assembly 4 is located at the first closing position, at this time, the plurality of small-flow anti-cavitation discs 51 and the plurality of large-flow anti-cavitation discs 31 are all closed, and liquid cannot flow from the liquid inlet channel 11 into the liquid outlet channel 13;

[0047] When the valve rod 143 moves from the first position to the second position, the blocking member 6 moves upward, the blocking member 6 moves from the second closing position to the second opening position, the inclined surface one 62 and the inclined surface two 52 change from abutting against each other to being separated from each other, and the flow guiding gap 61 is opened, at this time, liquid entering the liquid inlet channel 11 can flow into the liquid outlet channel 13 through the flow passage one 33, the flow passage two 44, the flow guiding gap 61, the small-flow anti-cavitation disc 51 and the liquid outlet port 32; at this time, with the upward movement of the valve rod 143, the flow gradually increases in a small range because the number of the small-flow anti-cavitation discs 51 that are opened is increasing; in this state, the valve core body 41 keeps closing the plurality of large-flow anti-cavitation discs 31.

[0048] When the valve rod 143 is located at the second position, the upper end of the protruding portion 63 is in contact with the stepped portion 421;

[0049] When the valve stem 143 moves from the second position to the third position, the convex part 63 drives the stepped part 421, i.e., the pressing sleeve 42, to move upward, at this time, the valve core assembly 4 moves upward, the valve core assembly 4 moves from the closed position one to the open position one, the plurality of large-flow anti-cavitation discs 31 are gradually opened, and the liquid entering the liquid inlet channel 11 can enter the liquid outlet channel 13 through the large-flow anti-cavitation discs 31 and the liquid outlet port 32; at this time, with the continuous upward movement of the valve stem 143, the number of large-flow anti-cavitation discs 31 being opened is more and more, and the flow rate will be greatly gradually increased; it should be noted that in the embodiment, the flow passage one 33 and the flow passage two 44 are staggered at this time, and the communication state of the flow passage one 33 and the flow passage two 44 ends.

[0050] It should be noted that the large-flow anti-cavitation disc 31 and the small-flow anti-cavitation disc 51 can be a labyrinth disc or a loop-flow hedging disc. 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 disc and the loop-flow hedging disc are prior art and thus will not be described here.

[0051] Generally, in the market, in order to meet the characteristics of large adjustable ratio, the inner diameters of the sleeve 3 and the valve core are designed to be large to meet the requirement of large flow rate, and small flow rate is generally realized based on such a structure by using the output of the execution part to perform a very small action. On the one hand, such an action is not easy to control, and on the other hand, the cooperation tolerance between the sleeve 3 and the valve core is required to be extremely high, and the manufacturing precision of the sleeve 3 and the valve core is required to be very high under the requirement of large size. Compared with the prior art, the small-flow anti-cavitation disc 51 in the application can be designed to be very small, so the flow rate can also be correspondingly very small.

[0052] The implementation principle of the large-adjustable-ratio anti-cavitation regulating valve in the embodiment of the application is as follows:

[0053] The driving execution member 141 drives the valve stem 143 to move upward, the valve stem 143 moves from the first position to the second position, the blocking member 6 moves upward, the blocking member 6 moves from the second closing position to the second opening position, the inclined surface one 62 and the inclined surface two 52 change from mutual adhesion to mutual separation, the flow guiding gap 61 is opened, the liquid flowing into the liquid inlet channel 11 flows into the liquid outlet channel 13 through the flow passage one 33, the flow passage two 44, the flow guiding gap 61, the small flow anti-cavitation disc 51 and the liquid outlet port 32, the multiple small flow anti-cavitation discs 51 are gradually opened, and the flow rate gradually increases in a small range; the valve stem 143 continues to move from the second position to the third position, the convex part 63 drives the stepped part 421, i.e., the pressing sleeve 42 to move upward, the valve core assembly 4 moves upward, the valve core assembly 4 moves from the first closing position to the first opening position, the multiple large flow anti-cavitation discs 31 are gradually opened, the liquid flowing into the liquid inlet channel 11 flows into the liquid outlet channel 13 through the large flow anti-cavitation disc 31 and the liquid outlet port 32, the multiple large flow anti-cavitation discs 31 are gradually opened, and the flow rate gradually increases in a large range.

[0054] The embodiments of the specific implementation are the preferred embodiments of the present application, but do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A large adjustable ratio anti-cavitation control valve characterized by: The utility model provides a valve, including valve body (1), the valve body (1) includes liquid inlet channel (11), installation channel (12) and liquid outlet channel (13) that communicate in turn, the installation channel (12) is installed with main valve seat (2), the main valve seat (2) is installed with sleeve (3), the sleeve (3) has large flow anti cavitation disc (31) on, the large flow anti cavitation disc (31) with liquid inlet channel (11) is communicated, the sleeve (3) has liquid outlet port (32) with liquid outlet channel (13) is communicated; The sleeve (3) is slidably connected with the valve core assembly (4), the valve core assembly (4) has a closed position and an open position, when the valve core assembly (4) moves from the closed position to the open position, the large flow anti cavitation disc (31) is communicated with 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 a secondary valve seat (5), the secondary valve seat (5) is provided with a small flow anti cavitation disc (51) capable of being communicated with the liquid outlet port (32), the sleeve (3) is provided with a flow channel (33), and the valve core assembly (4) is provided with a flow channel (44); the sealing piece (6) has a closed position and an open position, when the sealing piece (6) moves from the closed position to the open position, the small flow anti cavitation disc (51) is communicated with the liquid inlet channel (11) through the flow channel (33) and the flow channel (44), and the small flow anti cavitation disc (51) is gradually opened. The valve body (1) is provided with an execution assembly (14), the execution assembly (14) is connected with a valve rod (143), the valve rod (143) is fixedly connected with the sealing piece (6); the valve rod (143) has a first position, a second position and a third position, when the valve rod (143) moves from the first position to the second position, the sealing piece (6) moves from the closed position to the open position, and when the valve rod (143) moves from the second position to the third position, the sealing piece (6) drives the valve core assembly (4) to move from the closed position to the open position.

2. A large adjustable ratio anti-cavitation control valve according to claim 1, characterized in that: The small flow anti cavitation disc (51) and the large flow anti cavitation disc (31) are provided with a plurality of small flow anti cavitation discs (51) and a plurality of large flow anti cavitation discs (31), and the plurality of small flow anti cavitation discs (51) are densely arranged on the secondary valve seat (5) along the moving direction of the sealing piece (6), and the plurality of large flow anti cavitation discs (31) are densely arranged on the sleeve (3) along the moving direction of the valve core assembly (4).

3. A large adjustable ratio anti-cavitation control valve according to claim 1 wherein: The valve core assembly (4) includes a valve core body (41) slidably connected to the inner wall of the sleeve (3), and the valve core body (41) is detachably provided with a pressing sleeve (42); the pressing sleeve (42) has a stepped portion (421), the sealing piece (6) has a protruding portion (63), and when the sealing piece (6) moves from the closed position to the open position, the protruding portion (63) abuts against the stepped portion (421), so that the stepped portion (421) is driven to move.

4. A large adjustable ratio anti-cavitation control valve according to claim 3 wherein: The valve core body (41) and the sleeve (3) are jointly connected with a sealing ring (43).

5. A large adjustable ratio anti-cavitation control valve according to claim 1 wherein: The blocking member (6) comprises a first inclined surface (62), the auxiliary valve seat (5) comprises a second inclined surface (52), the first inclined surface (62) is in contact with the second inclined surface (52) when the blocking member (6) is in the second closing position; the valve core assembly (4) comprises a first inclined surface (411), the main valve seat (2) comprises a second inclined surface (21), the first inclined surface (411) is in contact with the second inclined surface (21) when the valve core assembly (4) is in the first closing position.

6. A large adjustable ratio anti-cavitation control valve according to claim 5 wherein: A sealing buffer gasket (22) is connected between the main valve seat (2) and the mounting channel (12), and the thickness direction of the sealing buffer gasket (22) is the movement direction of the valve rod (143).

7. A large adjustable ratio anti-cavitation control valve according to claim 1 wherein: The execution assembly (14) comprises an execution member (141) and a valve cover (142), the valve body (1) comprises a mounting port (15) at the top end, the valve cover (142) is detachably mounted on the valve body (1) and closes the mounting port (15), and the execution member (141) is mounted on the valve cover (142).

8. A large adjustable ratio anti-cavitation control valve according to claim 1 wherein: The liquid inlet channel (11) is higher than the liquid outlet channel (13).

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