Power oil nozzle

Abstract

The utility model relates to the technical field of oil and gas collecting equipment and facilities, and particularly discloses a power oil nozzle which comprises a valve body, a valve sleeve assembly and a driving assembly, a cavity, a liquid inlet channel and a liquid outlet channel are arranged in the valve body, a valve seat is arranged on the valve body and located in the liquid outlet channel, the valve sleeve assembly comprises a plug, a valve sleeve and a valve rod assembly, and the valve sleeve assembly is arranged in the cavity. The valve rod assembly is in sliding fit with the plug and the valve sleeve, a lining is arranged between the valve sleeve and the valve rod assembly, the valve rod assembly is in sliding fit with the lining, and the valve rod assembly is matched with the valve seat to control the flow area between the liquid inlet channel and the liquid outlet channel. The driving assembly is used for driving the valve rod assembly to move in the valve sleeve assembly. According to the utility model, the valve sleeve assembly is arranged outside the valve rod assembly, so that the valve rod part of the valve rod assembly is wrapped in the valve sleeve, and only the erosion-resistant valve tip made of the hard alloy material is exposed in a fluid erosion environment, so that the service life of the valve rod assembly can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas gathering equipment and facilities, and particularly relates to a power choke. Background Art

[0002] A power choke is a valve that changes the throttling section of a flow passage through an electric, hydraulic or manual mechanism to control the fluid flow rate during the fracturing or testing operation of an oil and gas well, and can adapt to occasions with high temperature, ultra-high pressure (175 MPa) and large sand content. Valves used in fluid control systems range from the simplest globe valve to various valves used in extremely complex automatic control systems, and their varieties and specifications are quite numerous. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, liquid metals and radioactive media. Due to being exposed to the fluid erosion environment for a long time, the valve stem of the existing valve is easily eroded and damaged by the fluid. Therefore, there is an urgent need for a valve with excellent erosion resistance and long service life. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a power choke to solve the problem that the existing power choke is easily corroded in the fluid erosion environment and has a short working life.

[0004] The utility model is realized through the following technical solutions:

[0005] A power choke includes:

[0006] A valve body, in which a cavity is provided, and a liquid inlet channel and a liquid outlet channel that are respectively communicated with the cavity. A valve seat is arranged in the valve body on the liquid outlet channel.

[0007] A valve sleeve assembly, which includes a plug, a valve sleeve and a valve stem assembly arranged between the plug and the valve sleeve. The valve sleeve is connected to one end of the plug, and the valve stem assembly is slidably matched with the plug and the valve sleeve, so that the valve stem assembly can move towards the direction of the liquid outlet channel. The valve sleeve assembly is fixedly arranged in the valve body, and one end of the valve sleeve can extend into the cavity of the valve body. A bushing is arranged between the valve sleeve and the valve stem assembly, and the valve stem assembly is slidably matched with the bushing. A sealing assembly is arranged between the valve stem assembly and the bushing. One end of the valve stem assembly is matched with the valve seat to control the flow area between the liquid inlet channel and the liquid outlet channel.

[0008] A drive assembly for driving the movement of the valve stem assembly in the valve sleeve assembly.

[0009] In some embodiments, a centering sleeve is arranged between the plug and the valve stem assembly and between the bushing and the valve stem assembly.

[0010] In some embodiments, a reduced-diameter section is provided on the bushing for mating with the valve sleeve. A pressure relief channel is provided between the bushing and the valve sleeve at the position where the reduced-diameter section is located. A pressure relief hole communicating with the pressure relief channel is provided on the valve sleeve.

[0011] In some embodiments, the valve stem assembly includes a valve stem and a valve tip provided at the end of the valve stem. One end of the valve tip is embedded in the end of the valve stem. The end of the valve stem where the valve tip is provided and the valve tip respectively form a sliding fit with the valve sleeve, while ensuring that only the carbide valve tip part resistant to erosion is exposed to the fluid erosion environment during the movement of the valve stem assembly.

[0012] In some embodiments, a valve sleeve cavity is provided at one end of the valve sleeve near the valve tip. A balance channel communicating with the valve sleeve cavity is provided between the valve tip and the valve stem.

[0013] In some embodiments, the valve sleeve assembly is fixedly connected to the valve body through a union nut. A stopper forms a limit fit between the end of the stopper and the end of the valve body to limit the movement of the stopper towards the valve body. The union nut is fixedly connected to the valve body by a thread. The end of the stopper is arranged inside the union nut and forms a limit fit with the union nut to limit the movement of the stopper away from the valve body. The end of the stopper extends outside the union nut, and a limit retaining ring is provided between the end of the stopper extending outside the union nut and the union nut.

[0014] In some embodiments, a sealing fit section is provided between the valve sleeve and the valve body, and a sealing fit is formed between the valve sleeve and the valve body at the sealing fit section. A clearance fit section is provided between the stopper and the valve body, and a clearance is formed between the stopper and the valve body at the clearance fit section. The clearance fit section is arranged on one side of the sealing fit end. The length of the threaded connection section between the union nut and the valve body is greater than the length of the sealing fit section.

[0015] In some embodiments, a support fit section is provided between the stopper and the valve body outside the clearance fit section, and a sliding fit is formed between the stopper and the valve body at the support fit section.

[0016] In some embodiments, the drive assembly includes a drive mechanism, a transmission screw, and a connection flange;

[0017] The connection flange is fixedly connected to one end of the stopper. The transmission screw is arranged inside the connection flange and forms a sliding fit with the connection flange. A limit fit is formed between the transmission screw and the connection flange to limit the rotation of the transmission screw inside the connection flange. One end of the valve stem assembly extends into the transmission screw. A plurality of set screws are provided between the transmission screw and the valve stem assembly. One end of the set screw abuts against the valve stem assembly, and the other end abuts against the inner wall of the connection flange;

[0018] The drive mechanism includes a worm gear, and the worm gear is in transmission fit with the worm section of the transmission screw.

[0019] In some embodiments, an outlet flange communicating with the liquid outlet channel is provided on the valve body. An adaptive gasket is provided between the outlet flange and the valve body. The adaptive gasket includes two main sealing parts that can be fitted into the liquid outlet channel and the outlet flange, and an auxiliary sealing part circumferentially arranged between the two main sealing parts. The auxiliary sealing part is fitted between the end face of the valve body and the end face of the outlet flange.

[0020] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0021] 1. By sleeving a plug, a valve sleeve and a bushing on the outside of the valve stem assembly respectively, and the valve stem assembly is slidably and cooperatively connected with the plug, the valve sleeve and the bushing respectively. When the driving assembly drives the valve stem assembly to move in the valve sleeve assembly and cooperate with the valve seat, the valve stem part in the valve stem assembly is wrapped in the valve sleeve, and at the same time, it is ensured that only the carbide valve tip part resistant to erosion is exposed in the fluid erosion environment during the movement of the valve stem assembly, which can extend the service life of the valve stem assembly.

[0022] 2. A sealing and mating section is provided between the valve sleeve assembly and the valve body, and the assembly or disassembly resistance here is relatively large. Since the length of the threaded connection section between the union nut and the valve body is greater than the length of the sealing and mating section, during disassembly, when the union nut is completely disengaged, the force applied by the union nut on the limit retaining ring has caused the valve sleeve assembly to disengage from the sealing and mating section, and it can be easily taken out; during assembly, after the valve sleeve assembly is moved into the valve body, when the union nut is tightened, the valve sleeve assembly is pushed and easily pressed into the sealing and mating section to complete the assembly, reducing the labor intensity.

[0023] 3. A centering sleeve is provided between the plug and the valve stem assembly and between the bushing and the valve stem assembly, ensuring that the valve stem has sufficient rigidity in the working environment of ultra-high pressure and strong vibration and preventing abrasion between the valve stem and the valve sleeve.

[0024] 4. A balance channel communicating with the valve sleeve cavity is provided inside the valve tip. When the power nozzle adjusts the flow rate, the valve tip is driven by the valve stem, causing the enclosed space between the valve sleeve and the valve stem to change. Through this balance channel, the space pressure between the valve sleeve cavity and the valve body can be balanced, reducing the movement resistance of the valve stem assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of the power nozzle in the embodiment of the present utility model;

[0027] Figure 2 This is a schematic structural diagram of the valve sleeve assembly in the embodiment of the present utility model;

[0028] Figure 3 This is a schematic structural diagram of the bushing in the embodiment of the present utility model;

[0029] Figure 4 This is a schematic structural diagram of the valve stem assembly in the embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of the assembled state of the valve body and the valve sleeve assembly in the embodiment of the present utility model;

[0031] Figure 6 This is a schematic diagram of the disassembled state of the valve body and the valve sleeve assembly in the embodiment of the present utility model;

[0032] Figure 7 This is a schematic structural diagram of the outlet flange and the valve body in the embodiment of the present utility model;

[0033] Figure 8 This is a schematic structural diagram of the adaptive gasket in the embodiment of the present utility model;

[0034] Figure 9 This is a schematic structural diagram of the drive assembly in the embodiment of the present utility model;

[0035] Figure 10 This is a schematic structural diagram of the cooperation between the transmission screw and the connecting flange in the embodiment of the present utility model.

[0036] Wherein: 1. Valve body, 11. Liquid inlet channel, 12. Liquid outlet channel, 121. Valve seat;

[0037] 2. Valve sleeve assembly, 21. Plug, 211. Plug groove, 212. Locking screw, 22. Valve sleeve, 23. Valve stem assembly, 231. Valve stem, 232. Valve tip, 233. Balance channel, 234. Valve sleeve cavity, 235. Plug pin, 236. Locking groove, 237. Non-metallic gasket, 238. Erosion-resistant alloy, 24. Sealing assembly, 25. Bushing, 251. Bushing mounting hole, 252. Sealing element, 26. Centering sleeve, 27. Pressure relief channel, 271. Pressure relief hole, 28. Union nut, 281. Limit retaining ring, 282. Sealing fit section, 283. Clearance fit section, 284. Threaded connection section, 285. Support fit section, 286. Valve sleeve assembly sealing surface, 287. Valve body sealing surface;

[0038] 3. Drive assembly, 31. Driving mechanism, 32. Transmission screw, 33. Connecting flange, 34. Set screw;

[0039] 4. Outlet flange, 41. Adaptive gasket ring, 411. Main sealing part, 412. Sub-sealing part, 42. Alloy sleeve;

[0040] 5. Lifting device. Detailed implementation mode

[0041] To make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0042] Embodiment 1

[0043] As Figures 1 to 10 shown, a power oil nozzle includes:

[0044] Valve body 1, a cavity is arranged in the valve body 1, and a liquid inlet channel 11 and a liquid outlet channel 12 respectively communicated with the cavity are arranged. A valve seat 121 is arranged in the valve body 1 in the liquid outlet channel 12;

[0045] Valve sleeve assembly 2, the valve sleeve assembly 2 includes a plug 21, a valve sleeve 22 and a valve rod assembly 23 arranged in the plug 21 and the valve sleeve 22. The valve sleeve 22 is connected to one end of the plug 21. The valve rod assembly 23 is slidably matched with the plug 21 and the valve sleeve 22, so that the valve rod assembly 23 can move towards the direction of the liquid outlet channel 12. The valve sleeve assembly 2 is fixedly arranged in the valve body 1, and one end of the valve sleeve 22 can extend into the cavity of the valve body 1. A bushing 25 is arranged between the valve sleeve 22 and the valve rod assembly 23. The valve rod assembly 23 is slidably matched with the bushing 25. A sealing assembly 24 is arranged between the valve rod assembly 23 and the bushing 25. One end of the valve rod assembly 23 is matched with the valve seat 121 to control the flow area between the liquid inlet channel 11 and the liquid outlet channel 12;

[0046] Drive assembly 3, the drive assembly 3 is used to drive the movement of the valve rod assembly 23 in the valve sleeve assembly 2.

[0047] In this embodiment, the sealing assembly 24 can ensure the sealing performance of the valve rod assembly 23 during operation. By sleeving the plug 21, the valve sleeve 22 and the bushing 25 on the outer part of the valve rod assembly 23 respectively, and the valve rod assembly 23 is slidably connected with the plug 21, the valve sleeve 22 and the bushing 25 respectively. When the drive assembly 3 drives the valve rod assembly 23 to move in the valve sleeve assembly 2 and cooperate with the valve seat 121, the valve rod part of the valve rod assembly 23 is wrapped in the valve sleeve 22, and only the valve tip 232 part made of erosion-resistant hard alloy material is exposed to the fluid erosion environment, which can extend the service life of the valve rod assembly 23.

[0048] In some embodiments, the valve seat 121 is made of erosion-resistant cemented carbide, which can ensure the safety of the equipment and extend the service life of the equipment.

[0049] Embodiment 2

[0050] As Figure 2 and Figure 3 shown, a centering sleeve 26 is provided between the plug 21 and the valve stem assembly 23, and between the bushing 25 and the valve stem assembly 23. By providing the centering sleeve 26, it is ensured that the valve stem 231 has sufficient rigidity in the working environment of ultra-high pressure and strong vibration, and prevents rubbing between the valve stem 231 and the valve sleeve 22. The centering sleeve 26 can also assist in scraping off the sediment impurities adhered to the valve stem 231.

[0051] As Figure 3 shown, the bushing 25 is provided with a reduced-diameter section that cooperates with the valve sleeve 22. A pressure relief channel 27 is provided between the bushing 25 and the valve sleeve 22 at the position where the reduced-diameter section is located. A pressure relief hole 271 communicating with the pressure relief channel 27 is provided on the valve sleeve 22, which can release the residual pressure accumulated at the bushing 25 and eliminate the potential risks during maintenance and disassembly.

[0052] As Figure 1 、 Figure 2 and Figure 6 shown, the valve sleeve assembly 2 is fixedly connected to the valve body 1 through the union nut 28. The plug 21 forms a limit fit between the end of the plug 21 and the end of the valve body 1 to limit the movement of the plug 21 in the direction of the valve body 1. The union nut 28 is fixedly connected to the valve body 1 by threads. The end of the plug 21 is arranged inside the union nut 28 and forms a limit fit with the union nut 28 to limit the movement of the plug 21 in the direction away from the valve body 1. The end of the plug 21 extends out of the union nut 28, and a limit retaining ring 281 is provided between the end of the plug 21 extending out of the union nut 28 and the union nut 28. When the union nut 28 is screwed out, the outward movement of the union nut 28 will push the limit retaining ring 281 on the plug 21, causing the entire valve sleeve assembly 2 to also move outward, making it easier to remove the valve sleeve 22.

[0053] As Figure 5 and Figure 6As shown in the figure, a sealing fit section 282 is provided between the valve sleeve 22 and the valve body 1. A sealing fit is formed between the valve sleeve 22 and the valve body 1 at the sealing fit section 282. A clearance fit section 283 is provided between the plug 21 and the valve body 1. A clearance is formed between the plug 21 and the valve body 1 at the clearance fit section 283. The clearance fit section 283 is provided on one side of the sealing fit end. The length of the threaded connection section 284 between the union nut 28 and the valve body 1 is greater than the length of the sealing fit section 282. A support fit section 285 is provided between the plug 21 and the valve body 1 outside the clearance fit section 283. A sliding fit is formed between the plug 21 and the valve body 1 at the support fit section 285. When the union nut 28 is completely unscrewed, the sealing surface of the valve sleeve assembly 2 has separated from the valve body sealing surface 287, and there is a clearance between the valve sleeve assembly 2 and the valve body 1 as a whole, enabling the valve sleeve assembly 2 to be easily pulled out. Similarly, during assembly, by rotating the union nut 28, the valve sleeve assembly 2 can be pressed into the valve body 1 together.

[0054] As Figure 2 shown, a plug groove 211 is provided at the threaded end of the plug 21. After the valve sleeve 22 and the plug 21 are assembled, a locking screw 212 is installed in the plug groove 211, which can prevent the plug 21 from becoming disengaged in a vibrating working environment.

[0055] At the connection between one end of the bushing 25 and the valve sleeve 22, three seals 252 are provided, further ensuring the sealing performance between the bushing 25 and the valve sleeve 22.

[0056] On the end face of the bushing 25, two bushing mounting holes 251 are provided. The bushing mounting holes 251 adopt a threaded structure, which can facilitate the removal of the bushing 25 from the valve sleeve 22.

[0057] Embodiment 3

[0058] As Figure 2 and Figure 4 shown, the valve stem assembly 23 includes a valve stem 231 and a valve tip 232 provided at the end of the valve stem 231. One end of the valve tip 232 is embedded in the end of the valve stem 231. The end of the valve stem 231 where the valve tip 232 is provided and the valve tip 232 respectively have a sliding fit with the valve sleeve 22. The inner hole at the end of the valve sleeve 22 is in close fit with the valve tip 232, which can not only protect the valve stem 231 from strong fluid erosion but also straighten the valve tip 232 to prevent the valve tip 232 from being damaged by vibration.

[0059] As Figure 4As shown in the figure, a valve sleeve cavity 234 is provided at one end of the valve sleeve 22 near the valve tip 232. A balance channel 233 communicating with the valve sleeve cavity 234 is provided on the valve tip 232 and the valve stem 231. When the flow rate of the power nozzle is adjusted, the valve tip 232 is driven by the valve stem 231, causing the enclosed space between the valve sleeve 22 and the valve stem 231 to change. When liquid penetrates into the valve sleeve cavity 234, the enclosed space will be filled with the penetrated medium and cannot flow normally, and thus the valve stem 231 cannot move and adjust normally. Through this balance channel 233, the space pressure between the valve sleeve cavity 234 and the valve body 1 can be balanced.

[0060] An erosion-proof alloy 238 is provided at one end of the valve sleeve 22 that cooperates with the valve tip 232, ensuring that the part of the valve sleeve 22 facing the liquid inlet channel 11 can work for a long time in a working environment with strong erosion and strong corrosion.

[0061] A non-metallic gasket 237 is provided on the inner wall of one end of the valve sleeve 22 that is connected to the valve tip 232, which is used to scrape off the infiltrated sediment, prevent the valve sleeve 22 from being worn and the valve tip 232 from being stuck, and can also play a certain role in seismic buffering.

[0062] An interference fit is adopted between the valve tip 232 and the valve stem 231, and the assembly is carried out by heating; after the valve tip 232 and the valve stem 231 are assembled, a pin hole is provided at the connection between the valve tip 232 and the valve stem 231. A pin 235 is inserted into the pin hole, and the pin 235 passes through the valve stem 231 and cooperates with the concave hole on the outer wall of the valve tip 232 to make the valve stem 231 and the valve tip 232 tenoned, ensuring that the valve tip 232 will not fall off in an environment with strong erosion and strong vibration.

[0063] Embodiment 4

[0064] As Figure 1 、 Figure 9 and Figure 10 shown, the drive assembly 3 includes a drive mechanism 31, a transmission screw 32, and a connection flange 33;

[0065] The connection flange 33 is fixedly connected to one end of the plug 21. The transmission screw 32 is arranged in the connection flange 33 and forms a sliding fit with the connection flange 33. A limit fit is formed between the transmission screw 32 and the connection flange 33 to limit the rotation of the transmission screw 32 in the connection flange 33. One end of the valve stem 231 assembly extends into the transmission screw 32. A plurality of set screws 34 are provided between the transmission screw 32 and the valve stem assembly 23. One end of the set screw 34 abuts against the valve stem 231 assembly, and the other end abuts against the inner wall of the connection flange 33;

[0066] The driving mechanism 31 includes a worm gear, which is in transmission cooperation with the worm section of the transmission screw 32, converting the torque of the worm gear rotation into linear motion, causing the valve stem 231 connected to the transmission screw 32 to have an axial displacement, thereby adjusting the throttle area to control the pressure and flow rate of the liquid outlet channel 12.

[0067] The head of the transmission screw 32 has an external polygonal structure, which cooperates with the internal polygon of the connecting flange 33, preventing the transmission screw 32 from rotating. The rest of the transmission screw 32 is a threaded structure, converting the rotation of the worm gear of the driving mechanism 31 into the axial linear motion of the transmission screw 32.

[0068] As Figure 10 shown, on the external thread of the valve stem 231 corresponding to the internal thread at the polygonal end of the transmission screw 32, there is a groove. A set screw 34 is installed on the transmission screw 32 and cooperates with the groove to prevent the valve stem 231 from unthreading. The top of the screw is just flush with the polygonal plane of the transmission screw 32 and contacts and limits the internal polygonal plane of the connecting flange 33, preventing the set screw 34 from falling off, further ensuring that the valve stem 231 is locked and cannot unthread.

[0069] In some embodiments, as Figure 1 shown, in order to further prevent the driving mechanism 31 device connected to the connecting flange 33 from rotating and tipping over, a keyway or plane is milled in the middle of the connecting flange 33 to cooperate and lock with the hoisting device 5.

[0070] Embodiment 5

[0071] As Figure 7 and Figure 8 shown, an outlet flange 4 communicating with the liquid outlet channel 12 is provided on the valve body 1. An adaptive gasket 41 is provided between the outlet flange 4 and the valve body 1. The adaptive gasket 41 includes two main sealing parts 411 that can be fitted into the liquid outlet channel 12 and the outlet flange 4, and a secondary sealing part 412 arranged circumferentially between the two main sealing parts 411. The secondary sealing part 412 is fitted between the end face of the valve body 1 and the end face of the outlet flange 4. The main sealing part 411 is a conical surface. The pre-tightening force generated during installation causes the main sealing part 411 and the secondary sealing part 412 to be simultaneously squeezed and deformed to fit the sealing surface of the outlet flange 4 to produce a sealing effect. When the main sealing part 411 is under pressure, the adaptive gasket 41 will produce a slight deformation, making the sealing surface of the outlet flange 4 fit more tightly. The greater the pressure, the stronger the sealing ability is stimulated and the better the pressure-bearing effect is.

[0072] In some embodiments, the adaptive gasket 41 should have a smaller installation size than the BX gasket.

[0073] In some embodiments, an alloy sleeve 42 is provided in the outlet flange 4. The alloy sleeve 42 is a hard alloy resistant to erosion, and it is embedded in the outlet flange 4 to ensure the safety of the equipment and extend the service life of the equipment.

[0074] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0075] In addition, when the terms "horizontal" and "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but they can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0076] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be 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 components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0077] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention falls within the protection scope of the present invention.

Claims

1. A power nozzle, characterized in that, Comprising: A valve body (1), within which a cavity is provided, as well as a liquid inlet passage (11) and a liquid outlet passage (12) respectively communicating with the cavity. A valve seat (121) is provided on the valve body (1) within the liquid outlet passage (12). A valve sleeve assembly (2), which includes a plug (21), a valve sleeve (22), and a valve stem assembly (23) disposed within the plug (21) and the valve sleeve (22). The valve sleeve (22) is connected to one end of the plug (21). The valve stem assembly (23) is slidably engaged between the plug (21) and the valve sleeve (22), enabling the valve stem assembly (23) to move in the direction of the liquid outlet passage (12). The valve sleeve assembly (2) is fixedly arranged within the valve body (1), and one end of the valve sleeve (22) can extend into the cavity of the valve body (1). A bushing (25) is provided between the valve sleeve (22) and the valve stem assembly (23), and the valve stem assembly (23) is slidably engaged with the bushing (25). A sealing assembly (24) is provided between the valve stem assembly (23) and the bushing (25). One end of the valve stem assembly (23) cooperates with the valve seat (121) to control the flow area between the liquid inlet passage (11) and the liquid outlet passage (12). A driving assembly (3), which is used to drive the movement of the valve stem assembly (23) within the valve sleeve assembly (2).

2. The power nozzle according to claim 1, characterized in that, A centering sleeve (26) is provided between the plug (21) and the valve stem assembly (23), and between the bushing (25) and the valve stem assembly (23).

3. The power nozzle according to claim 1, characterized in that, The bushing (25) is provided with a reduced-diameter section that cooperates with the valve sleeve (22). A pressure relief passage (27) is provided between the bushing (25) and the valve sleeve (22) at the position where the reduced-diameter section is located. A pressure relief hole (271) communicating with the pressure relief passage (27) is provided on the valve sleeve (22).

4. The power nozzle according to claim 1, characterized in that, The valve stem assembly (23) includes a valve stem (231) and a valve tip (232) provided at the end of the valve stem (231). One end of the valve tip (232) is embedded in the end of the valve stem (231). The end of the valve stem (231) where the valve tip (232) is provided and the valve tip (232) are respectively slidably engaged with the valve sleeve (22).

5. The power nozzle according to claim 4, characterized in that, A valve sleeve cavity (234) is provided at one end of the valve sleeve (22) close to the valve tip (232). A balance passage (233) communicating with the valve sleeve cavity (234) is provided on the valve tip (232) and the valve stem (231).

6. The power nozzle according to claim 1, characterized in that, The valve sleeve assembly (2) is fixedly connected between the union nut (28) and the valve body (1). The plug (21) forms a limiting fit between the end of the plug and the end of the valve body (1) to limit the movement of the plug (21) in the direction of the valve body (1). The union nut (28) and the valve body (1) are fixedly connected by threads. The end of the plug (21) is arranged inside the union nut (28) and forms a limiting fit with the union nut (28) to limit the movement of the plug (21) in the direction away from the valve body (1). The end of the plug (21) extends outside the union nut (28), and a limiting retaining ring (281) is arranged between the end of the plug (21) extending outside the union nut (28) and the union nut (28).

7. The power nozzle according to claim 6, wherein A sealing fit section (282) is arranged between the valve sleeve (22) and the valve body (1). A sealing fit is formed between the valve sleeve (22) and the valve body (1) in the sealing fit section (282). A clearance fit section (283) is arranged between the plug (21) and the valve body (1). A clearance is formed between the plug (21) and the valve body (1) in the clearance fit section (283). The clearance fit section (283) is arranged on one side of the sealing fit end. The length of the threaded connection section (284) between the union nut (28) and the valve body (1) is greater than the length of the sealing fit section (282).

8. The power nozzle according to claim 7, wherein, A support fit section (285) is arranged outside the clearance fit section (283) between the plug (21) and the valve body (1). A sliding fit is formed between the plug (21) and the valve body (1) in the support fit section (285).

9. The power nozzle according to claim 1, characterized in that, The drive assembly (3) includes a drive mechanism (31), a transmission screw (32), and a connecting flange (33). The connecting flange (33) is fixedly connected to one end of the plug (21). The transmission screw (32) is arranged inside the connecting flange (33) and forms a sliding fit with the connecting flange (33). A limiting fit is formed between the transmission screw (32) and the connecting flange (33) to limit the rotation of the transmission screw (32) inside the connecting flange (33). One end of the valve stem (231) assembly extends into the transmission screw (32). A plurality of set screws (34) are arranged between the transmission screw (32) and the valve stem assembly (23). One end of the set screw (34) abuts against the valve stem (231) assembly, and the other end abuts against the inner wall of the connecting flange (33). The drive mechanism (31) includes a worm gear, and the worm gear is in transmission fit with the worm section of the transmission screw (32).

10. The power nozzle according to claim 1, characterized in that, An outlet flange (4) communicating with the liquid outlet channel (12) is arranged on the valve body (1). An adaptive gasket (41) is arranged between the outlet flange (4) and the valve body (1). The adaptive gasket (41) includes two main sealing parts (411) that can be fitted into the liquid outlet channel (12) and the outlet flange (4), and an auxiliary sealing part (412) arranged circumferentially between the two main sealing parts (411). The auxiliary sealing part (412) is fitted between the end face of the valve body (1) and the end face of the outlet flange (4).

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