High-pressure-difference large-diameter multi-stage regulating valve

Abstract

The utility model relates to a high-pressure-difference large-diameter multi-stage regulating valve, which belongs to the technical field of regulating valves and comprises a valve body, a first valve port and a second valve port are formed in the valve body, a valve cylinder extending along the axial direction of the valve body is arranged in the valve body, and a through hole communicated with the first valve port is formed in the side wall of the valve cylinder; the separation assembly is arranged in the valve cylinder and comprises a plurality of valve sleeves and gaskets which are coaxially arranged and alternately connected in a sealed mode, the outer rings of the gaskets are connected with the inner wall of the valve cylinder in a sealed mode, the outer diameter of the valve sleeves is smaller than the inner diameter of the valve cylinder, and a circle of inlet holes and a circle of outlet holes are formed in the valve sleeves in the axial direction at intervals; the valve rod is located in the valve body and penetrates through the valve sleeves and the gaskets, and the valve rod is provided with a plurality of valve elements matched with the inner walls of the valve sleeves in a sliding mode. According to the regulating valve, on the premise that high pressure drop is achieved, the adverse effects of cavitation, erosion, vibration, noise and the like caused by media to the valve and a pipe system where the valve is located in the pressure drop process can be effectively relieved, the working performance of the regulating valve under severe working conditions such as high pressure difference is guaranteed, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of control valves, and particularly relates to a high-pressure-difference large-bore multi-stage control valve. Background Art

[0002] A control valve is used to regulate the flow rate, pressure or liquid level of a medium. According to the signal of the regulating part, the opening of the valve is controlled, so as to achieve the regulation of the flow rate, pressure or liquid level of the medium. It can be used in industries such as petroleum, chemical, metallurgy and power stations.

[0003] In the related art, a large-bore high-pressure-difference control valve has the characteristics of a relatively large nominal diameter, a high flow coefficient and a relatively large pressure difference. If the pressure-reducing structure is not reasonably designed, it will not only fail to meet the on-site working conditions well, but also cause relatively large noise and oscillation, pollute the environment, and greatly shorten the service life of the valve.

[0004] In view of this, the present application provides a high-pressure-difference large-bore multi-stage control valve, which can effectively reduce the adverse effects such as cavitation, erosion, vibration and noise brought by the medium to the valve and the pipeline system during the pressure reduction process on the premise of realizing a high pressure drop, ensure the working performance of the control valve under harsh working conditions such as high pressure difference, and extend the service life of the valve. Summary of the Invention

[0005] The embodiment of the present application provides a high-pressure-difference large-bore multi-stage control valve, which can effectively reduce the adverse effects such as cavitation, erosion, vibration and noise brought by the medium to the valve and the pipeline system during the pressure reduction process on the premise of realizing a high pressure drop, ensure the working performance of the control valve under harsh working conditions such as high pressure difference, and extend the service life of the valve.

[0006] The embodiment of the present application provides a high-pressure-difference large-bore multi-stage control valve, including:

[0007] A valve body, which has a first valve port and a second valve port, and a valve cylinder extending along its axial direction is arranged in the valve body, and a through hole communicating with the first valve port is arranged on the side wall of the valve cylinder;

[0008] A separating assembly, which is arranged in the valve cylinder, and the separating assembly includes a plurality of valve sleeves and gaskets that are coaxially arranged and alternately sealed and connected. The outer circle of the gasket is sealed and connected with the inner wall of the valve cylinder. The outer diameter of the valve sleeve is smaller than the inner diameter of the valve cylinder, and a circle of inlet holes and a circle of outlet holes are arranged at intervals along the axial direction on the valve sleeve;

[0009] A valve rod, which is located in the valve body and passes through a plurality of the valve sleeves and gaskets. A plurality of valve cores that are respectively slidably matched with the inner walls of the valve sleeves are arranged on the valve rod, and the valve cores can axially move along with the valve rod to close the inlet holes, or form an axial dislocation with the inlet holes and the outlet holes.

[0010] In some embodiments, the number of the inlet holes and the outlet holes is the same and they are arranged at intervals along the circumferential direction of the valve sleeve, and the axial dimension of the valve core is not greater than the axial distance between the inlet holes and the outlet holes.

[0011] In some embodiments, the outer ring of the gasket is hermetically connected to the inner wall of the valve cylinder through a sealing ring, and annular grooves for butting against the valve sleeve to radially limit the valve sleeve are provided on both sides of the gasket.

[0012] In some embodiments, a valve seat and a gland are provided in the valve cylinder at both ends of the partition assembly respectively. The inlet hole is provided on the gland. A step for axially limiting the valve cylinder and the valve seat is provided in the valve body, and a valve cover for axially pressing against the valve cylinder and the gland is installed on the valve body.

[0013] In some embodiments, when the valve core is in contact with the valve seat, the valve core closes the inlet hole; when the valve core is separated from the valve seat, the valve core and the inlet hole and the outlet hole are axially misaligned.

[0014] In some embodiments, a chamfer groove adapted to the conical surface on the valve core is provided on the valve seat, and a sealing member for cooperating with the conical surface is provided in the chamfer groove.

[0015] In some embodiments, a stuffing box for cooperating with the valve stem and a gland for pressing the stuffing box are provided on the valve cover. A housing and a transmission structure located in the housing are provided on the gland, and a driving member capable of driving the transmission structure to drive the valve stem to move axially is provided on the housing.

[0016] In some embodiments, the transmission structure is a bevel gear set. The bevel gear set includes a large gear threadedly connected to the valve stem and rotatably connected in the housing, and a small gear meshing with the large gear. The driving member is connected to the small gear through a rotating shaft.

[0017] In some embodiments, the valve stem and the valve core are of an integrally formed structure, and the mating section of the valve stem and the valve cover is a non-circular cross-section section.

[0018] In some embodiments, the valve body includes a front valve body section and a rear valve body section that are coaxially detachably connected. The first valve port is radially provided on the front valve body section, and the second valve port is axially provided on the rear valve body section.

[0019] The beneficial effects brought by the technical solutions provided in this application include:

[0020] The embodiments of this application provide a high-pressure difference large-bore multi-stage regulating valve, which includes a valve body having a first valve port and a second valve port. A valve cylinder extending along the axial direction of the valve body is provided in the valve body, and a through hole communicating with the first valve port is provided on the side wall of the valve cylinder;

[0021] A separating component is arranged inside the valve cylinder. The separating component includes a plurality of valve sleeves and gaskets that are coaxially arranged and alternately sealed and connected. The outer ring of the gasket is sealingly connected to the inner wall of the valve cylinder. The outer diameter of the valve sleeve is smaller than the inner diameter of the valve cylinder. A circle of inlet holes and a circle of outlet holes are axially spaced on the valve sleeve.

[0022] A valve stem is located inside the valve body and passes through a plurality of valve sleeves and gaskets. The valve stem has a plurality of valve cores that are slidably adapted to the inner walls of the respective valve sleeves. The valve core can axially move along with the valve stem to close the inlet holes, or form an axial dislocation with the inlet holes and the outlet holes.

[0023] Since a plurality of valve sleeves and gaskets are installed in the valve cylinder inside the valve body, when the valve core forms an axial dislocation with the inlet holes and the outlet holes, a pressure-reducing flow channel similar to a labyrinth structure can be formed inside the valve body. After the incoming liquid enters the valve body and the valve cylinder, it can flow in and out of the valve sleeve repeatedly at a circle of inlet holes and a circle of outlet holes on the plurality of valve sleeves.

[0024] That is, after the liquid is split by a circle of outlet holes, it converges through a circle of inlet holes. The splitting and converging are alternately carried out. The liquid converges together after splitting to form a head-on collision, and rubs and collides with each other, so that the kinetic energy is converted into internal energy, thereby effectively controlling the too-high flow rate. After multiple collisions, a large-scale pressure reduction effect can be achieved.

[0025] In addition, since the large-diameter single flow channel of the valve body is improved to a small-diameter multi-flow channel, the friction area between the working liquid and the flow-through inner wall surface is increased, the proportion of friction energy consumption in the hydraulic energy loss is increased, and the proportion of sound energy is correspondingly reduced. Therefore, the liquid flow noise can be suppressed, and the proportion of friction energy consumption is increased, which weakens the vibration energy consumption caused by the direct impact of the water flow to a certain extent.

[0026] Thus, on the premise of achieving a high pressure drop, it can effectively reduce the adverse effects such as cavitation, erosion, vibration, and noise brought by the medium to the valve and the pipeline system during the pressure reduction process, ensure the working performance of the regulating valve under harsh working conditions such as high pressure difference, and extend the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 is a schematic structural diagram of an embodiment of the present application;

[0029] Figure 2 is a partial cross-sectional view of the valve body of an embodiment of the present application;

[0030] Figure 3Schematic diagram of the liquid flow direction inside the valve body according to an embodiment of the present application;

[0031] Figure 4 Schematic diagram of the liquid flow direction inside the valve body according to another embodiment of the present application.

[0032] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0033] 1. Valve body; 11. First valve port; 12. Second valve port; 13. Step; 2. Valve cylinder; 21. Through hole; 3. Valve sleeve; 31. Inlet hole; 32. Outlet hole; 4. Gasket; 41. Ring groove; 5. Valve stem; 51. Valve core; 6. Valve seat; 7. Compression sleeve; 8. Valve cover; 9. Pressure cover; 10. Housing;

[0034] 20. Driving member. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0036] The embodiments of the present application provide a high-pressure difference large-bore multi-stage regulating valve. The embodiments of the present application provide a high-pressure difference large-bore multi-stage regulating valve, which can effectively reduce the adverse effects such as cavitation, erosion, vibration, and noise brought by the medium to the valve and the pipeline system during the pressure reduction process on the premise of achieving a high pressure drop, ensure the working performance of the regulating valve under harsh working conditions such as high pressure difference, and extend the service life of the valve.

[0037] See Figures 1 to 4 As shown, the embodiments of the present application provide a high-pressure difference large-bore multi-stage regulating valve, including:

[0038] A valve body 1, which has a first valve port 11 and a second valve port 12 thereon. A valve cylinder 2 extending along its axial direction is provided inside the valve body 1, and a through hole 21 communicating with the first valve port 11 is provided on the side wall of the valve cylinder 2;

[0039] A separating assembly, which is arranged inside the valve cylinder 2. The separating assembly includes a plurality of valve sleeves 3 and gaskets 4 that are coaxially arranged and alternately sealed and connected. The outer circle of the gasket 4 is sealed and connected to the inner wall of the valve cylinder 2. The outer diameter of the valve sleeve 3 is smaller than the inner diameter of the valve cylinder 2. A circle of inlet holes 31 and a circle of outlet holes 32 are arranged at intervals along the axial direction on the valve sleeve 3;

[0040] The valve stem 5 is located inside the valve body 1 and passes through a plurality of valve sleeves 3 and washers 4. A plurality of valve cores 51 that are slidably adapted to the inner walls of the respective valve sleeves 3 are provided on the valve stem 5. The valve cores 51 can axially move along with the valve stem 5 to close the inlet holes 31, or be axially misaligned with the inlet holes 31 and the outlet holes 32.

[0041] In the valve cylinder 2 inside the valve body 1 of the high-pressure difference large-bore multi-stage regulating valve according to the embodiment of the present application, a plurality of valve sleeves 3 and washers 4 are installed. The valve cores 51 axially partition the flow channels inside the valve sleeves 3. When the valve cores 51 move upward along with the valve stem 5 and are axially misaligned with the inlet holes 31 and the outlet holes 32, in cooperation with the washers 4 axially partitioning the flow channels between the valve sleeves 3 and the valve cylinder 2, a pressure-reducing flow channel similar to a labyrinth structure can be formed inside the valve body 1.

[0042] After the incoming liquid enters the valve body 1 and the valve cylinder 2, it can flow into and out of the valve sleeves 3 repeatedly at a circle of inlet holes 31 and a circle of outlet holes 32 on the plurality of valve sleeves 3. That is, after the liquid is diverted out of the valve sleeves 3 through a circle of outlet holes 32, it then converges into the valve sleeves 3 through a circle of inlet holes 31. The diversion and convergence alternate. The liquid converges together after diversion to form a countercurrent, rubbing and colliding with each other, so that the kinetic energy is converted into internal energy, thereby effectively controlling the excessively high flow rate. After multiple collisions, a large-scale pressure reduction effect can be achieved.

[0043] In addition, since the large-diameter single flow channel of the valve body 1 is improved to a small-diameter multi-flow channel, the friction area between the working liquid and the flow-through inner wall surface is increased, the proportion of friction energy consumption in the hydraulic energy loss is increased, and the proportion of sound energy is correspondingly reduced. Therefore, the liquid flow noise can be suppressed, and the proportion of friction energy consumption is increased, weakening the vibration energy consumption caused by the direct impact of the water flow to a certain extent.

[0044] Thus, on the premise of achieving a high pressure drop, it can effectively reduce the adverse effects such as cavitation, erosion, vibration, and noise brought by the medium to the valve and the pipeline system during the pressure reduction process, ensure the working performance of the regulating valve under harsh working conditions such as high pressure difference, and extend the service life of the valve.

[0045] Exemplarily, by setting a plurality of valve sleeves 3 and washers 4 in the high-pressure difference large-bore multi-stage regulating valve of the present application, the maximum pressure difference between the first valve port 12 and the second valve port can reach 42 Mpa, and the maximum flow rate can reach 1000 cubic meters per hour.

[0046] In addition, it should be noted that in this embodiment, the first valve port 11 and the second valve port 12 can be used as liquid inlets and outlets for each other. When the first valve port 11 is used as the liquid inlet, the second valve port 12 serves as the liquid outlet; when the first valve port 11 is used as the liquid outlet, the second valve port 12 serves as the liquid inlet. In both of the above cases, the pressure reduction and energy consumption of the liquid can be achieved.

[0047] In some alternative embodiments: Refer to Figures 1 to 4As shown in the figure, an embodiment of the present application provides a high-pressure differential large-diameter multi-stage regulating valve. The number of inlet holes 31 and outlet holes 32 of the high-pressure differential large-diameter multi-stage regulating valve is the same and they are arranged at intervals along the circumferential direction of the valve sleeve 3. The axial dimension of the valve core 51 is not greater than the axial distance between the inlet hole 31 and the outlet hole 32.

[0048] In the embodiment of the present application, the diameters and numbers of the inlet holes 31 and the outlet holes 32 are the same, and the connecting line of the centers of two adjacent inlet holes 31 and outlet holes 32 is in the same direction as the axis direction of the valve sleeve 3. In addition, the axial dimension of the valve core 51 is not greater than the axial distance between the inlet hole 31 and the outlet hole 32. When the valve core 51 is axially misaligned with the inlet hole 31 and the outlet hole 32, the liquid can enter the valve sleeve 3 along the inlet hole 31 and then flow out of another valve sleeve 3 along the outlet hole 32, that is, a wavy small-diameter flow channel can be formed along the axial direction of the valve body 1.

[0049] Specifically, by cooperating the valve core 51 with a plurality of valve sleeves 3 and gaskets 4, the large-diameter single-flow channel of the valve cylinder 2 is improved into a small-diameter multi-flow channel. When the valve core 51 is axially staggered with the inlet hole 31 and the outlet hole 32, the liquid can be divided out of the valve sleeve 3 through a circle of outlet holes 32 and then converge into the valve sleeve 3 through a circle of inlet holes 31. The processes of diversion and convergence alternate. The liquid converges together after diversion to form a head-on collision, and rubs and collides with each other, so that the kinetic energy is converted into internal energy, thereby effectively controlling the excessive flow rate. After multiple collisions, a large-scale pressure reduction effect can be achieved.

[0050] In some alternative embodiments: Refer to Figures 1 to 4 As shown in the figure, an embodiment of the present application provides a high-pressure differential large-diameter multi-stage regulating valve. The outer ring of the gasket 4 of the high-pressure differential large-diameter multi-stage regulating valve is hermetically connected to the inner wall of the valve cylinder 2 through a sealing ring. Ring grooves 41 for docking with the valve sleeve 3 to radially limit the valve sleeve 3 are provided on both sides of the gasket 4.

[0051] In the embodiment of the present application, the outer ring of the gasket 4 is hermetically connected to the inner wall of the valve cylinder 2 through a sealing ring. The sealing ring can be an O-ring made of nitrile rubber, which plays an effective sealing role. In addition, ring grooves 41 are provided on both sides of the gasket 4. The ring grooves 41 can be axially docked with the valve sleeve 3, and the side walls of the ring grooves 41 can radially limit the valve sleeve 3, ensuring the installation accuracy of the valve sleeve 3 and ensuring the contact sealing performance.

[0052] In some alternative embodiments: Refer to Figures 1 to 4 As shown in the figure, an embodiment of the present application provides a high-pressure differential large-diameter multi-stage regulating valve. A valve seat 6 and a pressure sleeve 7 are provided in the valve cylinder 2 of the high-pressure differential large-diameter multi-stage regulating valve, and they are respectively located at both ends of the separating component. Inlet holes 31 are provided on the pressure sleeve 7. A step 13 for axially limiting the valve cylinder 2 and the valve seat 6 is provided in the valve body 1. A valve cover 8 for axially pressing the valve cylinder 2 and the pressure sleeve 7 is installed on the valve body 1.

[0053] The valve cylinder 2 in the embodiment of the present application is a cylindrical shell 10 with openings at both the upper and lower ends. A valve seat 6 and a compression sleeve 7 are also installed in the valve cylinder 2. The valve seat 6 abuts against a step 13 in the valve body 1 near the second valve port 12. A valve sleeve 3 is sealingly connected to the end of the valve seat 6, and a gasket 4 is sealingly connected to the head end of the compression sleeve 7. When the valve cover 8 is locked to the valve body 1 through fasteners, it can cooperate with the step 13 in the valve body 1 to axially press tightly the valve cylinder 2 and the compression sleeve 7, thereby positioning the valve sleeve 3, the gasket 4, and the valve seat 6.

[0054] To ensure that the incoming liquid can enter, a ring cavity surrounding the valve cylinder 2 and communicating with the first valve port 11 is provided on the valve body 1. The incoming liquid enters the valve cylinder 2 through the first valve port 11, the ring cavity, and the through hole 21. At the same time, a circle of inlet holes 31 is provided on the side wall of the compression sleeve 7. When the valve core 51 moves and forms a dislocation axially with the inlet holes 31 and the outlet holes 32, the liquid can flow into the valve sleeve 3 at the head end through a circle of inlet holes 31 on the compression sleeve 7.

[0055] In some alternative embodiments: Refer to Figures 1 to 4 As shown, the embodiment of the present application provides a high-pressure difference and large-diameter multi-stage regulating valve. When the valve core 51 of the high-pressure difference and large-diameter multi-stage regulating valve fits with the valve seat 6, the valve core 51 closes the inlet holes 31; when the valve core 51 is separated from the valve seat 6, the valve core 51 forms a dislocation axially with the inlet holes 31 and the outlet holes 32.

[0056] The cooperation between the valve seat 6 and the valve core 51 in the embodiment of the present application can realize the function of a cut-off valve to cut off and connect the liquid flowing through the valve body 1. Specifically, when the valve core 51 at the end fits with the valve seat 6, the valve cores 51 in each valve sleeve 3 simultaneously close the inlet holes 31, and multiple synchronous cuts are performed on the liquid flow path, having the advantage of small cut-off resistance and facilitating the movement of the control valve rod 5.

[0057] When the valve core 51 is separated from the valve seat 6, the valve core 51 forms a dislocation axially with the inlet holes 31 and the outlet holes 32. During the process of the liquid flowing in and out of the valve sleeve 3 repeatedly, the pressures on both axial sides of the valve core 51 are the same, that is, the valve core 51 has good stability when in the open position.

[0058] In some alternative embodiments: Refer to Figures 1 to 4 As shown, the embodiment of the present application provides a high-pressure difference and large-diameter multi-stage regulating valve. A chamfered groove adapted to the conical surface on the valve core 51 is provided on the valve seat 6 of the high-pressure difference and large-diameter multi-stage regulating valve, and a sealing member for cooperating with the conical surface is provided in the chamfered groove.

[0059] A chamfered groove adapted to the conical surface on the valve core 51 is provided on the valve seat 6 in the embodiment of the present application, and a sealing member is provided in the chamfered groove. When the conical surface of the valve core 51 at the end contacts the valve seat 6, a linear seal can be stably formed to realize rapid cut-off of the liquid flow, and it can be used as a cut-off valve to ensure zero leakage.

[0060] In some alternative embodiments: Refer toFigures 1 to 4 As shown in the figure, an embodiment of the present application provides a high-pressure differential large-bore multi-stage regulating valve. A gland and a gland 9 for pressing the gland are provided on the valve cover 8 of the high-pressure differential large-bore multi-stage regulating valve. A housing 10 and a transmission structure located inside the housing 10 are provided on the gland 9, and a driving member 20 capable of driving the transmission structure to drive the valve stem 5 to move axially is provided on the housing 10.

[0061] A gland is provided between the valve cover 8 and the valve stem 5 in the embodiment of the present application. The gland is pressed by the gland 9 installed through fasteners. In addition, a housing 10 is installed on the gland 9 through fasteners, and a transmission structure is installed inside the housing 10. The transmission structure is driven by the driving member 20 installed on the housing 10. The driving member 20 drives the valve stem 5 to move axially through the transmission structure, thereby realizing the opening and closing of the regulating valve.

[0062] In some alternative embodiments: Refer to Figures 1 to 4 As shown in the figure, an embodiment of the present application provides a high-pressure differential large-bore multi-stage regulating valve. The transmission structure of the high-pressure differential large-bore multi-stage regulating valve is a bevel gear set. The bevel gear set includes a large gear threadedly connected to the valve stem 5 and rotatably connected inside the housing 10, and a small gear meshing with the large gear. The driving member 20 is connected to the small gear through a rotating shaft.

[0063] The driving member 20 in the embodiment of the present application adopts an electric actuator. The electric actuator drives the rotating shaft to rotate, the rotating shaft drives the small gear to rotate, and the small gear drives the large gear to rotate. Since the large gear is rotatably connected inside the housing 10 and is simultaneously threadedly connected to the valve stem 5, when the large gear rotates, the screw can move axially, thereby realizing the opening and closing of the regulating valve.

[0064] In some alternative embodiments: Refer to Figures 1 to 4 As shown in the figure, an embodiment of the present application provides a high-pressure differential large-bore multi-stage regulating valve. The valve stem 5 and the valve core 51 of the high-pressure differential large-bore multi-stage regulating valve are integrally formed structures, and the mating section of the valve stem 5 and the valve cover 8 is a non-circular cross-section section.

[0065] The valve stem 5 and the valve core 51 in the embodiment of the present application are integrally formed structures, which can reduce welding operations and avoid welding defects caused by the welding process, improving product quality. That is, the valve stem 5 and the valve core 51 are integrally formed and have a multi-node guiding structure. In the case of horizontal installation of the valve, the valve can operate stably for a long time. In addition, the mating section of the valve stem 5 and the valve cover 8 is a non-circular cross-section section, which can prevent the valve stem 5 from rotating with the large gear.

[0066] In some alternative embodiments: Refer to Figures 1 to 4As shown in the figure, an embodiment of the present application provides a high-pressure differential large-bore multi-stage regulating valve. The valve body 1 of the high-pressure differential large-bore multi-stage regulating valve includes a front section and a rear section of the valve body 1 that are detachably connected coaxially. The first valve port 11 is radially arranged on the front section of the valve body 1, and the second valve port 12 is axially arranged on the rear section of the valve body 1.

[0067] The valve body 1 of the embodiment of the present application includes a front section and a rear section of the valve body 1 that are detachably connected coaxially. Exemplarily, the front section and the rear section of the valve body 1 can form a detachable sealed connection through threads and seals. When the regulating valve is installed horizontally as a whole, it is convenient to disassemble the front section and the rear section of the valve body 1 for maintenance and repair. At the same time, the first valve port 11 is radially arranged on the front section of the valve body 1, and the second valve port 12 is axially arranged on the rear section of the valve body 1. When the regulating valve is installed horizontally as a whole, it is convenient to connect and arrange pipelines for the regulating valve.

[0068] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0069] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0070] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will conform to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A high pressure difference large diameter multi-stage regulating valve, characterized in that: include: A valve body (1) having a first valve port (11) and a second valve port (12), wherein a valve cylinder (2) extending along the axial direction of the valve body (1) is arranged inside the valve body (1), and a through hole (21) communicating with the first valve port (11) is arranged on a side wall of the valve cylinder (2); a partition assembly, which is arranged in the valve cylinder (2), the partition assembly comprising a plurality of valve sleeves (3) and gaskets (4) which are coaxially arranged and alternately sealed and connected, the outer ring of the gasket (4) being sealed and connected to the inner wall of the valve cylinder (2), the outer diameter of the valve sleeve (3) being smaller than the inner diameter of the valve cylinder (2), and the valve sleeve (3) being provided with a circle of inlet holes (31) and a circle of outlet holes (32) spaced apart in the axial direction; A valve stem (5) is located in the valve body (1) and passes through the plurality of valve sleeves (3) and gaskets (4). The valve stem (5) has a plurality of valve cores (51) respectively slidably matched with the inner walls of the valve sleeves (3). The valve cores (51) can move axially with the valve stem (5) to close the inlet hole (31), or form an axial misalignment with the inlet hole (31) and the outlet hole (32).

2. The high pressure difference large diameter multi-stage regulating valve according to claim 1, characterized in that: The inlet holes (31) and the outlet holes (32) are of the same number and are spaced apart along the circumference of the valve sleeve (3); the axial dimension of the valve core (51) is not greater than the axial spacing between the inlet holes (31) and the outlet holes (32).

3. The high pressure difference large diameter multi-stage regulating valve according to claim 1, characterized in that: The outer ring of the gasket (4) is sealed to the inner wall of the valve cylinder (2) via a sealing ring, and both sides of the gasket (4) are provided with annular grooves (41) for docking with the valve sleeve (3) to radially limit the valve sleeve (3).

4. The high pressure difference large diameter multi-stage regulating valve according to claim 1, characterized in that: The valve cylinder (2) is provided with a valve seat (6) and a pressing sleeve (7) respectively located at the two ends of the partition assembly, the pressing sleeve (7) is provided with the inlet hole (31), the valve body (1) is provided with a step (13) for axially limiting the valve cylinder (2) and the valve seat (6), and the valve body (1) is equipped with a valve cover (8) for axially tightening the valve cylinder (2) and the pressing sleeve (7).

5. The high pressure difference large diameter multi-stage regulating valve according to claim 4, characterized in that: When the valve core (51) is in contact with the valve seat (6), the valve core (51) closes the inlet hole (31); when the valve core (51) is separated from the valve seat (6), the valve core (51) and the inlet hole (31) and the outlet hole (32) are misaligned in the axial direction.

6. The high pressure difference large diameter multi-stage regulating valve according to claim 4, characterized in that: The valve seat (6) is provided with a chamfered groove adapted to the conical surface on the valve core (51), and a sealing member for matching the conical surface is provided in the chamfered groove.

7. The high pressure difference large diameter multi-stage regulating valve according to claim 4, characterized in that: The valve cover (8) is provided with a sealing box that matches the valve stem (5) and a pressure cover (9) that presses the sealing box, the pressure cover (9) is provided with a shell (10) and a transmission structure located in the shell (10), and the shell (10) is provided with a driving member (20) that can drive the transmission structure to drive the valve stem (5) to move axially.

8. The high pressure difference large diameter multi-stage regulating valve according to claim 7, characterized in that: The transmission structure is a bevel gear set, which includes a large gear threadedly connected to the valve stem (5) and rotatably connected to the housing (10), and a small gear meshing with the large gear, and the driving member (20) is connected to the small gear via a rotating shaft.

9. The high pressure difference large diameter multi-stage regulating valve according to claim 4, characterized in that: The valve stem (5) and the valve core (51) are an integrally formed structure, and the matching section between the valve stem (5) and the valve cover (8) is a non-circular cross-section section.

10. The high pressure difference large diameter multi-stage regulating valve according to claim 1, characterized in that: The valve body (1) comprises a valve body front section and a valve body rear section which are coaxially detachably connected, the first valve port (11) is radially arranged on the valve body front section, and the second valve port (12) is axially arranged on the valve body rear section.

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