Double-control regulating valve with large adjustable ratio

Abstract

The invention relates to the technical field of regulating valves, in particular to a double-control regulating valve with a large adjustable ratio. The large-adjustable-ratio double-control regulating valve comprises a valve body, a fluid channel is formed in the valve body, a valve seat is arranged in the valve body, a fluid through hole is formed in the valve seat, a first valve deck is arranged on the valve body, a first valve element rod is arranged on the first valve deck in a sliding and penetrating mode, a first valve element is arranged on the first valve element rod, and the first valve element is connected into the valve seat in a sliding mode. The valve further comprises a second valve deck, a second valve element rod and a second valve element, the second valve deck is arranged on the valve body, the second valve element rod is arranged on the second valve deck in a sliding and penetrating mode, and the second valve element is arranged on the second valve element rod. The second valve element comprises a connecting part, a cut-off part, a first flow control part, a second flow control part, a third flow control part, a fourth flow control part and a fifth flow control part, the diameters of the connecting part, the cut-off part, the first flow control part, the second flow control part, the third flow control part, the fourth flow control part and the fifth flow control part are sequentially reduced, the connecting part is arranged on the second valve element rod, and the cut-off part is connected to the valve seat opening in a sealed mode.

Description

Technical Field

[0001] The invention relates to the technical field of regulating valves, and in particular to a large adjustable ratio double-control regulating valve. Background Art

[0002] In the industrial field, some units require their control valves to accurately control different flows under different pressure conditions under different operating conditions such as normal operation, start and stop, and testing. For example, under normal operating conditions, the control valve is required to have a large flow capacity, and under starting conditions, the control valve is required to be able to accurately control small flows.

[0003] Since the unit will operate under different operating conditions, a wide range of flow control is required. Wide range flow control requires the control valve to have a large adjustable ratio. Generally, enterprises will use two or more regulating valves installed in parallel for split-range control, of which at least one is a large-diameter regulating valve to meet the control requirements under large flow conditions, and at least one is a small-diameter regulating valve to meet the control requirements under small flow conditions. Under different conditions, only the regulating valve needs to be switched. However, the above-mentioned split-range control requires multiple regulating valves, and the corresponding main bypass pipelines and communication cables need to be prepared. The implementation cost is high and the continuity of flow control is poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a large adjustable ratio dual-control regulating valve, which can achieve high-precision control of flow under different working conditions, improve the continuity of flow control, and reduce implementation costs.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The present invention provides a large adjustable ratio double-control regulating valve, including a valve body, wherein the valve body has a fluid channel, the valve body is provided with a valve seat, the valve seat is provided with a fluid through hole, the valve body is provided with a first valve cover, the first valve cover is slidably penetrated by a first valve core rod, the first valve core is provided on the first valve core rod, the first valve core is slidably connected to the valve seat, and also includes: a second valve cover, a second valve core rod and a second valve core, the second valve cover is arranged on the valve body, the second valve core rod is slidably penetrated by the second valve cover, the second valve core is arranged on the second valve core rod, the second valve core comprises a connecting part, a cut-off part, a first flow control part, a second flow control part, a third flow control part, a fourth flow control part and a fifth flow control part, the connecting part is arranged on the second valve core rod, and when the second valve core seals the valve seat opening, the cut-off part is sealed and connected to the valve seat opening.

[0007] By adopting the above technical solution, when the medium flows in the fluid channel, if the flow of the fluid channel is to be controlled, an external driving device can be used to drive the first valve core rod and / or the second valve core rod to move toward the valve body. Among them, the first valve core rod drives the first valve core to move, which will bring about a rapid change in the opening of the fluid through hole, so that the rapid control of the flow change can be achieved, thereby realizing a large-caliber adjustment of the flow. The second valve core rod drives the second valve core to move, which will bring about a change in the opening of the valve seat. When the cut-off part is sealed and connected to the valve seat opening, the first flow control part, the second flow control part, the third flow control part, the fourth flow control part, and the fifth flow control part are inserted into the valve seat. Since the diameters of the first flow control part, the second flow control part, the third flow control part, the fourth flow control part, and the fifth flow control part decrease in sequence, the deeper the second valve core is inserted into the valve seat, the smaller the gap between the valve core opening and the second valve core. By adopting the second valve core of the above-mentioned structure, the opening of the valve seat opening can be converted from directly controlling the opening of the valve seat opening by its own movement to indirectly controlling the opening of the valve seat opening, that is, the opening of the valve seat opening is controlled by controlling the gap between the valve seat opening and the second valve core. This in disguised form lengthens the control distance, thereby greatly reducing the requirements for the accuracy of the driving equipment, and can bring about smaller changes in the medium flow rate, so as to realize small-diameter regulation of the flow rate.

[0008] In the above process, the first valve core can achieve large-diameter adjustment of the flow rate, and the second valve core can achieve small-diameter adjustment of the flow rate, and the adjustable ratio is greatly increased. And only one device is needed to achieve flow control under different working conditions, without the need for additional main bypass pipelines and communication cables, so the implementation cost is greatly reduced. The design of the second valve core can reduce the accuracy requirements for the drive equipment, the implementation cost can be further reduced, and the control accuracy of the flow rate is improved. Finally, since there is no need to switch the valve body during the flow control process, the continuity of flow control can be effectively guaranteed.

[0009] Optionally, the diameters at the connection between the first flow control unit and the second flow control unit are equal, the diameters at the connection between the second flow control unit and the third flow control unit are equal, the diameters at the connection between the third flow control unit and the fourth flow control unit are equal, and the diameters at the connection between the fourth flow control unit and the fifth flow control unit are equal.

[0010] By adopting the above technical solution, during the movement of the second valve core toward the valve seat opening, the valve seat opening will gradually decrease, and will not produce a step-by-step decrease due to a sudden decrease in the diameter of the connection, thereby further ensuring the continuity of flow control.

[0011] Optionally, the cut-off portion and the valve seat are connected by metal surface sealing.

[0012] By adopting the above technical solution, the sealing performance of the sealing connection between the cut-off portion and the valve seat can be effectively ensured, and the sealing performance is more wear-resistant.

[0013] Optionally, a guide ring is provided in the valve body, and the second valve core rod slides through the guide ring.

[0014] By adopting the above technical solution, the guide ring can guide the sliding path of the second valve core rod, thereby ensuring the stability of the second valve core when moving.

[0015] Optionally, a first limiting ring groove is opened on the inner wall of the valve seat, the first limiting ring groove is located on the side of the fluid through hole close to the first valve cover, a first sealing component is clamped in the first limiting ring groove, and the first sealing component is sealed and connected to the first valve core.

[0016] By adopting the above technical solution, the setting of the first sealing member can ensure the sealing effect of the connection between the valve seat and the first valve core, and prevent the medium from penetrating into the cavity between the first valve cover and the first valve core near one end of the first valve core rod when the first valve core rod cuts off the fluid channel (the opening of the fluid through hole is 0 at this time).

[0017] Optionally, the first sealing member is a toothed ring.

[0018] By adopting the above technical solution, the toothed ring has a good sealing effect and can effectively ensure the sealing effect between the valve seat and the first valve core.

[0019] Optionally, a first metal sealing surface is provided on the inner wall of the valve seat, the first metal sealing surface is located on the side of the fluid through hole away from the first valve cover, and a second metal sealing surface is provided on the edge of the first valve core away from one end of the first valve core rod, and the first metal sealing surface can be sealed and connected to the second metal sealing surface.

[0020] By adopting the above technical solution, when the first valve core rod cuts off the fluid channel, the first metal sealing surface is sealed and connected with the second metal sealing surface, which can effectively prevent the medium from flowing to the opening of the valve seat. That is, as long as the first valve core rod closes the fluid through hole, the fluid channel in the valve body can be cut off regardless of the position of the second valve core rod.

[0021] Optionally, a third O-ring is provided between the guide ring and the valve body, and a fourth O-ring is provided between the guide ring and the second valve cover.

[0022] By adopting the above technical solution, the third O-ring can achieve sealing between the guide ring and the valve body, and the fourth O-ring can achieve sealing between the guide ring and the second valve cover.

[0023] Optionally, a stuffing cavity is provided at a sliding penetration point between the first valve cover and the first valve core rod, and a sliding penetration point between the second valve cover and the second valve core rod, and the stuffing cavity is sealed with a stuffing piece.

[0024] By adopting the above technical solution, the packing member can achieve sealing of the sliding penetration point between the first valve cover and the first valve core rod, and can achieve sealing of the sliding penetration point between the second valve cover and the second valve core rod.

[0025] Optionally, the packing member includes: a packing base pad, a graphite packing, an intermediate pad, a V-type polytetrafluoro packing, a packing pressure plate and a packing pressure cover. The packing base pad, graphite packing, intermediate pad and V-type polytetrafluoro packing are filled in the packing cavity in sequence, the packing pressure cover is arranged on the V-type polytetrafluoro packing, and the packing pressure plate is bolted to the packing pressure cover.

[0026] By adopting the above technical solution, the packing bottom pad, graphite packing, middle pad, and V-type PTFE packing can achieve the sealing of the sliding penetration of the first valve cover and the first valve core rod, and can also achieve the sealing of the sliding penetration of the second valve cover and the second valve core rod. The packing gland can compress the above packings, and the packing pressure plate can limit and fix the above packings.

[0027] In summary, the present invention at least includes the following beneficial technical effects:

[0028] The first valve core can achieve large-diameter adjustment of the flow rate, and the second valve core can achieve small-diameter adjustment of the flow rate, greatly increasing the adjustable ratio. In addition, only one device is needed to achieve flow control under different working conditions, without the need for additional main bypass pipelines and communication cables, so the implementation cost is greatly reduced. The design of the second valve core can reduce the accuracy requirements for the drive equipment, the implementation cost can be further reduced, and the control accuracy of the flow rate is improved. Finally, since there is no need to switch the valve body during the flow control process, the continuity of flow control can be effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the cross-sectional structure of a large adjustable ratio double-control regulating valve.

[0030] Figure 2 for Figure 1 Enlarged view of part A.

[0031] Figure 3 for Figure 1 Magnified view of part B.

[0032] Figure 4 for Figure 1 Magnified view of part C.

[0033] Explanation of the reference numerals: 1. valve body; 2. valve seat; 3. first valve cover; 4. second valve cover; 5. first valve core rod; 6. second valve core rod; 7. first valve core; 8. second valve core; 9. first fluid channel; 10. second fluid channel; 11. fluid through hole; 12. fluid balance cavity; 13. connecting hole; 14. guide ring; 15. first limit ring groove; 16. toothed ring; 17. first metal sealing surface; 18. second metal sealing surface; 19. connection 1. first flow control section; 2. second flow control section; 2. third flow control section; 2. fourth flow control section; 2. fifth flow control section; 2. first O-ring; 2. second O-ring; 2. third O-ring; 2. fourth O-ring; 3. packing cavity; 3. packing bottom pad; 3. graphite packing; 3. middle pad; 3. V-type polytetrafluoroethylene packing; 3. packing pressure plate; 3. packing gland. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The terms used in the following embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to be used as limitations of the present invention. As used in the specification of the present invention and the appended claims, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear contrary indication in its context. It should also be understood that the term "and / or" used in the present invention refers to and includes any or all possible combinations of one or more listed items. The term "exemplary" means "used as an example, embodiment or illustrative", and any embodiment described as "exemplary" here does not have to be interpreted as being superior to or better than other embodiments. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can expressly or implicitly include one or more of these features, and in the description of the embodiments of the present invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0036] An embodiment of the present invention provides a large adjustable ratio dual-control regulating valve.

[0037] refer to Figure 1 The large adjustable ratio double-control regulating valve comprises: a valve body 1, a valve seat 2, a first valve cover 3, a second valve cover 4, a first valve core rod 5, a second valve core rod 6, a first valve core 7, and a second valve core 8.

[0038] refer to Figure 1 The valve body 1 has a fluid channel therein, through which the medium can flow. The fluid channel includes a first fluid channel 9 and a second fluid channel 10 that are interconnected. The first fluid channel 9 allows the medium to flow into the valve body 1 , and the second fluid channel 10 allows the medium to flow out of the valve body 1 .

[0039] The valve seat 2 is mounted on the valve body 1, and the valve seat 2 is located in the first fluid cavity. The valve seat 2 is provided with a fluid through hole 11 for medium flow. The first valve cover 3 and the second valve cover 4 are both mounted on the valve body 1, and the first valve cover 3 and the second valve cover 4 are respectively located on opposite sides of the valve body 1. The first valve core rod 5 and the second valve core rod 6 are respectively slidably penetrated on the first valve cover 3 and the second valve cover 4, and the first valve core rod 5 and the second valve core rod 6 are located on the same straight line.

[0040] The first valve core 7 is fixedly connected to the first valve core rod 5, and the first valve core 7 is slidably connected to the valve seat 2. The first valve core 7 is used to control the opening of the fluid through hole 11. A fluid balance cavity 12 is formed in the valve seat 2 between the first valve core 7 and the first valve cover 3, and a communication hole 13 is opened on the first valve core 7. When the fluid channel is in a passage state, the fluid balance cavity 12 can be connected with the fluid channel through the communication hole 13, and the fluid balance cavity 12 can reduce the unbalanced force of the medium acting on the first valve core 7.

[0041] The second valve core 8 is fixedly connected to the second valve core rod 6, the second valve core 8 is located in the second fluid channel 10, the second valve core 8 can be inserted into and sealedly connected to the opening of the valve seat 2, and the second valve core 8 is used to control the opening of the valve seat 2. A guide ring 14 is installed on the inner wall of the valve body 1, the guide ring 14 is located in the second fluid channel 10, and the second valve core rod 6 is slidably penetrated in the guide ring 14, thereby guiding the moving path of the second valve core 8.

[0042] It should be understood that the first valve core rod 5 and the second valve core rod 6 can be connected to the control device respectively, so as to realize the independent control of the first valve core 7 and the second valve core 8 respectively. By independently controlling the first valve core 7 and the second valve core 8, the first valve core 7 and the second valve core 8 can be independent of each other, and the first valve core 7 and the second valve core 8 can cooperate with each other to realize the control of the flow rate.

[0043] refer to Figure 1 and Figure 2, a first seal and a second seal are provided between the valve seat 2 and the first valve core 7. At least one first limiting ring groove 15 is provided on the inner wall of the valve seat 2, and the first limiting ring groove 15 is located on the side of the fluid through hole 11 close to the first valve cover 3. The first seal is clamped in the first limiting ring groove 15, and the first seal is sealed and connected to the first valve core 7. In the embodiment of the present application, the number of the first seal is two, and they are toothed rings 16. In other embodiments, the first seal can also be used in other numbers.

[0044] refer to Figure 1 and Figure 3 The second sealing member includes a first metal sealing surface 17 and a second metal sealing surface 18. The first metal sealing surface 17 is provided on the inner wall of the valve seat 2, and the first metal surface is located on the side of the fluid through hole 11 away from the first valve cover 3; the second metal sealing surface 18 is provided on the edge of the end of the first valve core 7 away from the first valve core rod 5. When the first valve core 7 closes the fluid through hole 11, that is, when the opening of the fluid through hole 11 is 0, that is, when the fluid passage is cut off, the first metal sealing surface 17 is sealed and connected with the second metal sealing surface 18.

[0045] refer to Figure 1 and Figure 4 The second valve core 8 is made of wear-resistant alloy, and the second valve core 8 includes an integrally formed connection portion 19, a cutoff portion 20, a first flow control portion 21, a second flow control portion 22, a third flow control portion 23, a fourth flow control portion 24, and a fifth flow control portion 25. The connection portion 19, the cutoff portion 20, the first flow control portion 21, the second flow control portion 22, the third flow control portion 23, the fourth flow control portion 24, and the fifth flow control portion 25 are stacked in sequence, and the diameters are reduced in sequence.

[0046] The connecting portion 19 is fixedly connected to the second valve core rod 6, the diameter of the cut-off portion 20 is larger than the inner diameter of the valve seat 2, the diameters of the first flow control portion 21, the second flow control portion 22, the third flow control portion 23, the fourth flow control portion 24 and the fifth flow control portion 25 are all smaller than the inner diameter of the valve seat 2, and the diameters of the first flow control portion 21, the second flow control portion 22, the third flow control portion 23, the fourth flow control portion 24 and the fifth flow control portion 25 are successively reduced, and the diameters of the connection between any two adjacent flow control portions are equal. That is, the diameters of the connection between the first flow control portion 21 and the second flow control portion 22 are equal, the diameters of the connection between the second flow control portion 22 and the third flow control portion 23 are equal, the diameters of the connection between the third flow control portion 23 and the fourth flow control portion 24 are equal, and the diameters of the connection between the fourth flow control portion 24 and the fifth flow control portion 25 are equal.

[0047] When the second valve core 8 closes the opening of the valve seat 2, the cut-off portion 20 is sealed with the inner wall of the valve seat 2 near the second valve cover 4, and the sealing connection between the cut-off portion 20 and the valve seat 2 can be a metal surface sealing connection. The first flow control portion 21, the second flow control portion 22, the third flow control portion 23, the fourth flow control portion 24 and the fifth flow control portion 25 are inserted into the valve seat 2.

[0048] A first O-ring 26 is provided between the valve seat 2 and the first valve cover 3 for sealing, a second O-ring 27 is provided between the valve body 1 and the first valve cover 3 for sealing, a third O-ring 28 is provided between the guide ring 14 and the valve body 1 for sealing, and a fourth O-ring 29 is provided between the guide ring 14 and the second valve cover 4 for sealing.

[0049] refer to Figure 1 The sliding penetration of the first valve cover 3 and the first valve core rod 5, and the sliding penetration of the second valve cover 4 and the second valve core rod 6 are both provided with packing cavities 30, and the packing cavities 30 are sealed with packing components. The packing components include a packing bottom pad 31, a graphite packing 32, an intermediate pad 33, a V-type polytetrafluoro packing 34, a packing pressure plate 35, and a packing gland 36. The packing bottom pad 31, the graphite packing 32, the intermediate pad 33, and the V-type polytetrafluoro packing 34 are sequentially filled in the packing cavity 30, the packing gland 36 is pressed on the V-type polytetrafluoro packing 34, and the packing pressure plate 35 is fixedly connected to the packing gland 36 by bolts. The two sliding penetrations can be sealed by the packing components.

[0050] The implementation principle of the large adjustable ratio dual-control regulating valve of the embodiment of the present application is as follows: when the first valve core rod 5 controls the first valve core 7 to move in the valve seat 2, the first valve core 7 can control the opening of the fluid through hole 11, thereby controlling the flow of the medium in the fluid channel. Since the movement of the first valve core 7 will bring about a rapid change in the opening of the fluid through hole 11, it is possible to achieve rapid control of the flow change, thereby achieving large-caliber regulation of the flow.

[0051] When the second valve core rod 6 controls the second valve core 8 to move in the valve seat 2, if the second valve core 8 is away from the opening of the valve seat 2, the valve seat 2 is in a fully open state. If the second valve core 8 is close to the opening of the valve seat 2, the second valve core 8 can control the opening of the valve seat 2, thereby controlling the flow rate of the medium in the fluid channel. Since the diameter of the second valve core 8 gradually decreases, the deeper the second valve core 8 is inserted into the valve seat 2, the smaller the gap between the valve core opening and the second valve core 8, resulting in a smaller opening of the valve seat 2. By adopting the second valve core 8 of the above structure, the movement of the second valve core 8 can be directly controlled to control the opening of the valve seat 2, which can be converted into indirectly controlling the opening of the valve seat 2, that is, the opening of the valve seat 2 is controlled by controlling the gap between the opening of the valve seat 2 and the second valve core 8, which in disguised form lengthens the control distance, so the requirements for the accuracy of the driving equipment are greatly reduced, which can effectively reduce the implementation cost. At this time, when the movement amount of the second valve core 8 is the same, it can bring about a smaller change in the medium flow rate, thereby achieving high-precision control of the flow rate under different working conditions, so as to achieve small-caliber regulation of the flow rate.

[0052] At the same time, the first valve core 7 and the second valve core 8 can cooperate with each other, and only one large adjustable ratio dual-control regulating valve is needed to achieve a large adjustable ratio, and there is no switching of the valve body 1, so the continuity of the flow control is improved. Furthermore, since the diameters of the connection points of any two adjacent flow control parts are equal, step changes in the flow control process can be effectively avoided. Designers can also design how the diameter of the first valve core 7 is reduced in sequence according to the actual implementation of the large adjustable ratio dual-control regulating valve.

[0053] It should be understood that, for the valve body in the prior art, the control of the flow by the valve body has a linear relationship, the size of the flow is only controlled by a valve core, and each position of the valve core corresponds to a specific value of the flow, so an adjustment curve can be generated. However, the present application independently controls the first valve core 7 and the second valve core 8, so the size of the flow is controlled by the first valve core 7 and the second valve core 8, and the positions of the first valve core 7 and the second valve core 8 correspond to a specific value of the flow, so an adjustment surface can be generated. Since the adjustment surface is related to the positions of the first valve core 7 and the second valve core 8, and the second valve core 8 is specially designed, the adjustment accuracy is higher.

[0054] As described above, the above embodiments are only used to introduce the technical solution of the present invention in detail, but the description of the above embodiments is only used to help understand the method and core idea of ​​the present invention and should not be understood as limiting the present invention. Changes or substitutions that can be easily thought of by technicians in the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A large adjustable ratio double-control regulating valve, comprising a valve body (1), wherein the valve body (1) has a fluid passage, wherein a valve seat (2) is arranged in the valve body (1), wherein a fluid through hole (11) is opened on the valve seat (2), wherein a first valve cover (3) is arranged on the valve body (1), wherein a first valve core rod (5) is slidably penetrated on the first valve cover (3), wherein a first valve core rod (5) is arranged on the first valve core rod (5), wherein the first valve core (7) is slidably connected to the valve seat (2), wherein the first valve core (7) is slidably connected to the valve seat (2), wherein the first valve core rod (5) is provided with a first valve core (7 ... (3) is slidably connected to the first valve seat (2), wherein the first valve core (3) is slidably connected to the first valve seat (2), wherein the first valve core (3) is slidably connected to the first valve seat (2), wherein the first valve core (3) is slidably connected to the first valve seat (2), wherein Also includes: A second valve cover (4), a second valve core rod (6) and a second valve core (8), wherein the second valve cover (4) is arranged on the valve body (1), the second valve core rod (6) is slidably penetrated on the second valve cover (4), the second valve core (8) is arranged on the second valve core rod (6), the second valve core (8) comprises a connecting portion (19) with successively decreasing diameters, a cut-off portion (20), a first flow control portion (21), a second flow control portion (22), a third flow control portion (23), a fourth flow control portion (24), and a fifth flow control portion (25), wherein the connecting portion (19) is arranged on the second valve core rod (6), and when the second valve core (8) seals the opening of the valve seat (2), the cut-off portion (20) is sealed and connected to the opening of the valve seat (2).

2. The large adjustable ratio dual-control regulating valve according to claim 1, characterized in that: The diameters of the connection between the first flow control part (21) and the second flow control part (22) are equal, the diameters of the connection between the second flow control part (22) and the third flow control part (23) are equal, the diameters of the connection between the third flow control part (23) and the fourth flow control part (24) are equal, and the diameters of the connection between the fourth flow control part (24) and the fifth flow control part (25) are equal.

3. The large adjustable ratio dual-control regulating valve according to claim 2 is characterized in that: The cut-off portion (20) and the valve seat (2) are connected by metal surface sealing.

4. The large adjustable ratio dual-control regulating valve according to claim 3 is characterized in that: A guide ring (14) is arranged in the valve body (1), and the second valve core rod (6) slides through the guide ring (14).

5. The large adjustable ratio dual-control regulating valve according to claim 4, characterized in that: A first limiting ring groove (15) is provided on the inner wall of the valve seat (2), the first limiting ring groove (15) is located on a side of the fluid through hole (11) close to the first valve cover (3), a first sealing member is clamped in the first limiting ring groove (15), and the first sealing member is sealedly connected to the first valve core (7).

6. The large adjustable ratio dual-control regulating valve according to claim 5, characterized in that: The first sealing member is a toothed ring (16).

7. The large adjustable ratio dual-control regulating valve according to claim 4, characterized in that: A first metal sealing surface (17) is provided on the inner wall of the valve seat (2), and the first metal sealing surface (17) is located on the side of the fluid through hole (11) away from the first valve cover (3). A second metal sealing surface (18) is provided on the edge of the first valve core (7) away from one end of the first valve core rod (5), and the first metal sealing surface (17) can be sealed and connected to the second metal sealing surface (18).

8. The large adjustable ratio dual-control regulating valve according to claim 4, characterized in that: A third O-ring (28) is arranged between the guide ring (14) and the valve body (1), and a fourth O-ring (29) is arranged between the guide ring (14) and the second valve cover (4).

9. The large adjustable ratio dual-control regulating valve according to claim 4, characterized in that: A stuffing cavity (30) is provided at a sliding penetration point between the first valve cover (3) and the first valve core rod (5), and at a sliding penetration point between the second valve cover (4) and the second valve core rod (6), and the stuffing cavity (30) is sealed by a stuffing piece.

10. The large adjustable ratio dual-control regulating valve according to claim 9, characterized in that: The packing member comprises: a packing base pad (31), a graphite packing (32), an intermediate pad (33), a V-shaped polytetrafluoroethylene packing (34), a packing pressure plate (35) and a packing pressure cover (36); the packing base pad (31), the graphite packing (32), the intermediate pad (33) and the V-shaped polytetrafluoroethylene packing (34) are sequentially filled in the packing cavity (30); the packing pressure cover (36) is arranged on the V-shaped polytetrafluoroethylene packing (34); and the packing pressure plate (35) is bolted to the packing pressure cover (36).

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