Valve device

Abstract

The application relates to a valve device. The valve device comprises a housing assembly and a valve rod assembly, the housing assembly is provided with an inlet and an outlet, the valve rod assembly is arranged in the housing assembly, the valve rod assembly has an open position and a closed position, and the valve rod assembly can reciprocate between the open position and the closed position; the valve rod assembly comprises a valve rod, a valve core and an auxiliary closing part, the valve core is arranged at one end of the valve rod close to the outlet, and the auxiliary closing part is arranged at one end of the valve rod close to the inlet, and the auxiliary closing part exerts an auxiliary closing force on the valve rod under the action of a working medium. The valve core of the valve device has high closing reliability and good stability, can effectively prevent working medium leakage, and has better safety performance.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to valve devices. Background Technology

[0002] In liquid rocket engine systems, the propellant valve is a core component used to control the flow of the working medium (propellant) and ensure stable engine operation. In related technologies, under cryogenic operating conditions, the elastic seal of the propellant valve seat loses elasticity and its compensation performance weakens. When the valve closes, the valve core may not seal properly, leading to leakage of the working medium and posing a significant safety hazard. Summary of the Invention

[0003] Therefore, it is necessary to provide a valve device to address the problem that the valve core of the bacterial valve is prone to not closing tightly and poses a safety hazard.

[0004] A valve device comprising:

[0005] The housing assembly has an inlet and an outlet;

[0006] A valve stem assembly is disposed within the housing assembly. The valve stem assembly has an open position and a closed position, and the valve stem assembly can reciprocate between the open position and the closed position. The valve stem assembly includes a valve stem, a valve core, and an auxiliary closing element. The valve core is disposed at the end of the valve stem near the discharge port, and the auxiliary closing element is disposed at the end of the valve stem near the inlet port. The auxiliary closing element applies an auxiliary closing force to the valve stem under the action of the working medium.

[0007] In one embodiment, a limiting structure is further included, which is disposed on the housing assembly and the valve stem assembly, the limiting structure being used to prevent the valve stem assembly from dislodging from the inlet of the housing assembly.

[0008] In one embodiment, the housing assembly includes an inlet flange assembly, the auxiliary closing element is at least partially disposed within the inlet flange assembly, and the limiting structure includes abutting limiting protrusions and limiting bosses, one of the limiting protrusions and the limiting bosses being disposed on the outer wall of the auxiliary closing element, and the other being disposed on the inner wall of the inlet flange assembly.

[0009] In one embodiment, the auxiliary closing element is sealed to the inlet flange assembly by a first resilient energy-storing seal.

[0010] In one embodiment, a cylinder assembly is further included, the cylinder assembly being disposed within the housing assembly, the valve stem passing through the cylinder assembly, and a pressure relief structure being provided between the valve core and the cylinder assembly.

[0011] In one embodiment, the pressure relief structure includes a pressure relief notch located on the end face of the valve core facing the cylinder assembly. During the process of the valve stem assembly moving from the closed position to the open position, a portion of the working medium between the valve core and the cylinder assembly is discharged through the pressure relief notch.

[0012] In one embodiment, the cylinder assembly includes an inner cylinder ring and an outer cylinder ring, the inner cylinder ring being disposed inside the outer cylinder ring, the valve stem being sealed to the inner cylinder ring by a first elastic energy storage seal, and the valve stem being sealed to the outer cylinder ring by a second elastic energy storage seal.

[0013] In one embodiment, a draining structure is further included, which includes an air blowing channel and a draining channel. The air blowing channel and the draining channel are disposed on the inlet flange assembly. A portion of the inner wall of the inlet flange assembly, a portion of the inner wall of the cylinder assembly, and a portion of the outer wall of the valve stem together form a draining cavity. Both the air blowing channel and the draining channel are connected to the draining cavity.

[0014] In one embodiment, the valve stem has a valve stem cavity inside, and a liquid inlet hole is formed on a portion of the side wall of the valve stem within the cylinder assembly, the liquid inlet hole communicating with the valve stem cavity. A liquid outlet hole is formed on a portion of the side wall of the valve stem within the drain cavity, the liquid outlet hole communicating with the valve stem cavity and the drain cavity.

[0015] In one embodiment, the auxiliary closing element is hollow inside.

[0016] In one embodiment, the auxiliary shut-off member has a flow guiding structure at the end facing the feed inlet.

[0017] In one embodiment, an adaptive adjustment mechanism is further included, which is disposed at the connection position of the valve stem and the valve core. The adaptive adjustment mechanism is used to adjust the alignment between the valve core and the discharge port when the valve stem assembly moves from the open position to the closed position.

[0018] In one embodiment, the adaptive adjustment mechanism includes an annular mounting groove and a plurality of rolling elements, the rolling elements being rotatably disposed within the annular mounting groove, the annular mounting groove being arranged circumferentially around the valve stem, a portion of the annular mounting groove being formed on the outer wall of the valve stem, and the remaining portion being formed on the inner wall of the valve core.

[0019] The aforementioned valve device includes a housing assembly and a valve stem assembly. The valve stem assembly has an open position and a closed position, and can reciprocate between the open and closed positions to control the opening and closing of the inlet and outlet. Furthermore, the valve stem assembly includes an auxiliary closing element, which is disposed at the end of the valve stem near the inlet. Under the action of the working medium, the auxiliary closing element can apply an auxiliary closing force to the valve stem. In particular, when the valve stem assembly is in the closed position, this auxiliary closing force can make the valve core tightly fit against the elastic seal of the valve seat, which can significantly improve the reliability and stability of the valve core closure, prevent leakage of the working medium, and thus eliminate safety hazards. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the valve stem assembly of the valve device of this application in the closed position.

[0021] Figure 2 This is a cross-sectional view of the valve stem assembly of the valve device of this application in the open position.

[0022] Figure 3 This is a three-dimensional schematic diagram of the inlet flange assembly in the valve device of this application.

[0023] Figure 4 This is a cross-sectional view of the inlet flange assembly and the air blowing nozzle and drain nozzle in the valve device of this application.

[0024] Figure 5 This is a three-dimensional schematic diagram of the cylinder assembly in the valve device of this application.

[0025] Figure 6 This is a schematic diagram of the end of the cylinder assembly in the valve device of this application.

[0026] Figure 7 for Figure 6 A sectional view along the A-A' direction.

[0027] Figure 8 This is a cross-sectional view of the valve seat in the valve device of this application.

[0028] Figure 9 This is a three-dimensional schematic diagram of the valve core in the valve device of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 101. Feed inlet; 102. Discharge outlet;

[0031] 2. Valve stem; 201. Valve stem cavity; 202. Liquid inlet; 203. Liquid outlet;

[0032] 3. Valve core; 301. Valve core groove;

[0033] 4. Auxiliary closing components;

[0034] 501. Limiting protrusion; 502. Limiting boss;

[0035] 601. First elastic energy storage seal; 602. Second elastic energy storage seal;

[0036] 7. Cylinder assembly; 701. Cylinder inner ring; 702. Cylinder outer ring; 703. Cylinder fluid passage; 704. Intake passage; 705. Control air chamber; 706. Connecting rib; 707. Limiting step;

[0037] 8. Pressure relief gap;

[0038] 9. Drainage chamber;

[0039] 10. Annular mounting groove;

[0040] 11. Rolling parts;

[0041] 12. Return spring;

[0042] 13. Imported flange assembly; 1301. Air blowing channel; 1302. Drainage channel; 1303. Flange body; 1304. Flow guide sleeve; 1305. Sealing ring; 1306. Flange liquid passage hole;

[0043] 14. Shell;

[0044] 15. Valve seat; 1501. Valve seat body; 1502. Resilient seal;

[0045] 16. Sealing gasket;

[0046] 17. Inflate the nozzle;

[0047] 18. Drainage connector;

[0048] 19. Control the air connection nozzle;

[0049] 20. First working medium chamber;

[0050] 21. Second working medium chamber. Detailed Implementation

[0051] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0052] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0057] Currently, when the microbial valve of a liquid rocket engine closes, the supply of control gas to the valve stops. Under the restoring force of the return spring, the valve core and valve stem move towards the outlet until the valve core abuts against the elastic seal of the valve seat, completing the valve closure process. However, under cryogenic operating conditions, the elasticity of the valve seat's elastic seal decreases, and its compensation performance weakens. The valve core cannot tightly fit against the valve seat's elastic seal, and gaps can easily exist between the valve core and the valve seat's elastic seal, causing the valve to not close tightly and leading to leakage of the working medium, posing a significant safety hazard.

[0058] Based on this, this application proposes a valve closing device that provides reliable shut-off.

[0059] See Figures 1-9 An embodiment of this application provides a valve device comprising: a housing assembly and a valve stem assembly. The housing assembly has an inlet 101 and an outlet 102. The valve stem assembly is disposed within the housing assembly and has an open position and a closed position. The valve stem assembly can reciprocate between the open position and the closed position. The valve stem assembly includes a valve stem 2, a valve core 3, and an auxiliary closing element 4. The valve core 3 is disposed at the end of the valve stem 2 near the outlet 102, and the auxiliary closing element 4 is disposed at the end of the valve stem 2 near the inlet 101. The auxiliary closing element 4 applies an auxiliary closing force to the valve stem 2 under the action of the working medium.

[0060] This valve stem assembly can reciprocate between an open position and a closed position to control the opening and closing of the inlet 101 and the outlet 102. The valve stem assembly includes an auxiliary closing element 4, which is located at the end of the valve stem 2 near the inlet 101. Under the action of the working medium, the auxiliary closing element 4 can apply an auxiliary closing force to the valve stem 2. Especially when the valve stem assembly is in the closed position, this auxiliary closing force can make the valve core 3 fit tightly against the elastic seal 1502 of the valve seat 15, which can significantly improve the reliability and stability of the valve core 3 closing, prevent the leakage of the working medium, and thus eliminate safety hazards.

[0061] The valve device of this application is used to control the on / off state of the working medium, for example, the working medium may be liquid methane. In one embodiment of this application, the valve device may be a cryogenic microbial valve of a liquid rocket engine subsystem, the working medium being a liquid medium. This cryogenic microbial valve can be used in the fuel circuit or the oxidizer circuit, and by controlling the on / off state of the fuel circuit and the oxidizer circuit, the start / stop control function of the engine combustor can be realized.

[0062] In one embodiment of this application, the valve device can also be used in systems with normal temperature or low temperature liquid working media.

[0063] The valve device includes a housing assembly and a valve stem assembly. The housing assembly has a valve cavity inside, which accommodates structural components such as the valve stem assembly. The housing assembly includes an inlet 101 and an outlet 102. The working medium enters the valve device through the inlet 101 and exits through the outlet 102. In one embodiment of this application, the inlet 101 and the outlet 102 are coaxially arranged.

[0064] The valve stem assembly is housed within the housing assembly. The valve stem assembly has an open position and a closed position. When the valve stem assembly is in the open position, the valve is open, connecting the inlet 101 and outlet 102, allowing the working medium to be output from the outlet 102. When the valve stem assembly is in the closed position, the valve is closed, isolating the inlet 101 and outlet 102, preventing the working medium from being output from the outlet 102. The valve stem assembly can reciprocate between the open and closed positions to achieve switching control of the valve's open / close state. When the valve stem assembly moves from the open position to the closed position, the direction of movement is as follows: Figure 1 and Figure 2 As shown by arrow a, when the valve stem assembly moves from the closed position to the open position, the direction of movement of the valve stem assembly is as follows: Figure 1 and Figure 2 As indicated by the middle arrow b.

[0065] See Figure 1 and Figure 2 As shown, the valve stem assembly includes a valve stem 2, a valve core 3, and an auxiliary closing element 4. The valve stem 2 is axially positioned along the reciprocating direction of the valve stem assembly. One end of the valve stem 2 is positioned near the inlet 101, and the other end is positioned near the outlet 102. The valve core 3 is positioned at the end of the valve stem 2 near the outlet 102, and the auxiliary closing element 4 is positioned at the end of the valve stem 2 near the inlet 101. In one embodiment of this application, the valve stem 2, valve core 3, and auxiliary closing element 4 are coaxially arranged, and the valve stem assembly is coaxially arranged with both the inlet 101 and the outlet 102 to ensure the consistency of the valve stem assembly's movement and to ensure the opening efficiency and closing reliability of the valve device.

[0066] When the valve stem assembly is in the open position, the valve core 3 opens the outlet 102, and the inlet 101 and outlet 102 are connected. The working medium entering the valve device from the inlet 101 can be output through the outlet 102. When the valve stem assembly is in the closed position, the valve core 3 blocks the outlet 102, and the inlet 101 and outlet 102 are isolated. The working medium entering the valve device from the inlet 101 cannot be output through the outlet 102.

[0067] The auxiliary closing element 4 applies an auxiliary closing force to the valve stem 2 under the action of the working medium. The direction of this auxiliary closing force is as follows: Figure 1 and Figure 2 As indicated by the middle arrow a, when the valve stem assembly moves from the open position to the closed position, the auxiliary closing force applied by the auxiliary closing element 4 to the valve stem 2 can offset part of the liquid resistance generated by the working medium during the closing process of the valve stem assembly, making the closing process of the valve stem assembly smoother. When the valve stem assembly is in the closed position, this auxiliary closing force can press the valve core 3 against the valve seat 15, making the valve core 3 tightly fit the elastic seal 1502 of the valve seat 15, and can significantly improve the reliability and stability of the valve core closing, prevent the leakage of the working medium, and thus eliminate safety hazards.

[0068] It should be noted that the auxiliary closing element 4 is located at the end of the valve stem 2 near the inlet and is always in contact with the working medium. Regardless of whether the valve is open or closed, the working medium is always present at the inlet 101, and this working medium always applies liquid pressure to the auxiliary closing element 4. When the valve stem assembly is in the open position, when the valve stem assembly moves from the open position to the closed position, when the valve stem assembly is in the closed position, and when the valve stem assembly moves from the closed position to the open position, the working medium applies liquid pressure to the auxiliary closing element 4, ensuring that the auxiliary closing element 4 always provides an auxiliary closing force to the valve stem assembly. When the valve stem assembly is in the closed position, due to the ultra-low temperature operating conditions, the elasticity of the elastic seal 1502 of the valve seat 15 decreases and its compensation performance weakens. Gaps may easily exist between the valve core 3 and the elastic seal 1502. The auxiliary closing force applied to the valve stem assembly by the auxiliary closing member 4 can press the valve core 3 against the valve seat 15, eliminating the gap between the valve core 3 and the elastic seal 1502, so that the valve core 3 fits tightly against the elastic seal 1502 of the valve seat 15, thereby ensuring the reliability of valve core closure.

[0069] In one embodiment of this application, the valve device further includes a limiting structure disposed on the housing assembly and the valve stem assembly, the limiting structure being used to prevent the valve stem assembly from dislodging from the inlet 101 from the housing assembly.

[0070] In this embodiment, during the opening and closing of the valve device, the valve stem assembly moves relative to the housing assembly. In order to prevent the valve stem assembly from coming off the feed port 101 due to the deformation of the valve core 3, a limiting structure is provided between the housing assembly and the valve stem assembly. The limiting structure is used to prevent the valve stem assembly from coming off the housing assembly from the feed port 101, thereby improving the structural reliability.

[0071] In one embodiment of this application, the housing assembly includes an inlet flange assembly 13, and the auxiliary closing member 4 is at least partially disposed within the inlet flange assembly 13. The limiting structure includes a limiting protrusion 501 and a limiting boss 502 that can abut against each other. One of the limiting protrusion 501 and the limiting boss 502 is disposed on the outer wall of the auxiliary closing member 4, and the other is disposed on the inner wall of the inlet flange assembly 13.

[0072] See Figure 1 and Figure 2 As shown, the housing assembly includes an inlet flange assembly 13, a housing 14, and a valve seat 15. The inlet flange assembly 13, housing 14, and valve seat 15 are arranged sequentially along the flow direction of the working medium. All three components are connected by flanges with studs and nuts. In this embodiment, the inlet flange assembly 13, housing 14, valve seat 15, valve stem 2, valve core 3, and auxiliary closing element 4 are coaxially arranged. An inlet 101 is located on the inlet flange assembly 13, and an outlet 102 is located on the valve seat 15. The interiors of the inlet flange assembly 13, housing 14, and valve seat 15 together form the valve cavity of the valve device.

[0073] The auxiliary closing element 4 is partially or entirely placed inside the inlet flange assembly 13 so that the auxiliary closing element 4 is closer to the feed inlet 101, thereby enhancing its auxiliary closing force on the valve stem 2.

[0074] The limiting structure includes a limiting protrusion 501 and a limiting boss 502, which can abut against each other to limit the valve stem assembly. One of the limiting protrusion 501 and the limiting boss 502 is provided on the outer wall of the auxiliary closing member 4, and the other is provided on the inner wall of the inlet flange assembly 13.

[0075] See Figure 1 and Figure 2As shown, in one embodiment of this application, a limiting protrusion 501 is disposed on the outer wall of the auxiliary closing member 4, and the limiting protrusion 501 protrudes from the outer wall of the auxiliary closing member 4. A limiting boss 502 is disposed on the inner wall of the inlet flange assembly 13. During the process of the valve stem assembly moving from the closed position to the open position, if the valve core 3 is deformed, the valve stem assembly will continue to move in the direction shown by arrow b after moving to the open position, and may even detach from the housing assembly from the feed port 101. At this time, the valve stem assembly will be limited by the limiting protrusion 501 abutting against the limiting boss 502, and the valve stem assembly cannot continue to move towards the feed port 101, thereby preventing the valve stem assembly from detaching from the housing assembly from the feed port 101, thus protecting the valve assembly.

[0076] In one embodiment of this application, the limiting protrusion 501 is disposed on the inner wall of the inlet flange assembly 13, while the limiting boss 502 is disposed on the outer wall of the auxiliary closing member 4, as long as the limiting protrusion 501 can abut against the limiting boss 502.

[0077] In one embodiment of this application, the inlet flange assembly 13 is coaxially arranged with the valve stem assembly. See also Figures 1-3 As shown, the inlet flange assembly 13 includes a flange body 1303 with a feed inlet 101. A flow guide sleeve 1304 is disposed inside the flange body 1303, and an auxiliary closing element 4 passes through the flow guide sleeve 1304, which is axially movable relative to the flow guide sleeve 1304. A sealing ring 1305 is connected to the end of the flange body 1303 away from the feed inlet 101. In one embodiment of this application, the flange body 1303, the flow guide sleeve 1304, and the sealing ring 1305 can be connected by welding. The nominal diameter of the inlet flange assembly 13 should be the same as the nominal diameter of the valve device; the specific nominal diameter parameters are determined according to the product design input.

[0078] In one embodiment of this application, the auxiliary closing element 4 and the inlet flange assembly 13 are sealed by a first elastic energy storage seal 601.

[0079] See Figure 1 and Figure 2 As shown, the first elastic energy storage seal 601 is sleeved on the outer wall of the auxiliary closing member 4. The first elastic energy storage seal 601 is used to seal the gap between the auxiliary closing member 4 and the inlet flange assembly 13 and reduce the leakage of the working medium at the gap.

[0080] Specifically, the first elastic energy storage seal 601 is sleeved on the outer wall of the auxiliary closing member 4 and placed inside the flow guide sleeve 1304. The first elastic energy storage seal 601 is used to seal the gap between the auxiliary closing member 4 and the flow guide sleeve 1304. Optionally, the first elastic energy storage seal 601 can be installed using components such as a retaining ring and a locking nut to ensure that the first elastic energy storage seal 601 can be firmly set between the auxiliary closing member 4 and the inlet flange assembly 13.

[0081] The first elastic energy storage seal 601 between the auxiliary closing component 4 and the guide sleeve 1304 adopts a spring energy storage seal ring. This spring energy storage seal ring has a simple structure, low cost and high stability. It is suitable for low temperature and ultra-low temperature conditions and can maintain reliable sealing performance for a long time, meeting the needs of rocket engine use.

[0082] In one embodiment of this application, the valve device further includes a cylinder assembly 7, which is disposed within the housing assembly. The valve stem 2 passes through the cylinder assembly 7, and a pressure relief structure is provided between the valve core 3 and the cylinder assembly 7.

[0083] See Figure 1 and Figure 2 As shown, the cylinder assembly 7 is coaxially arranged with the housing assembly and is located inside the housing 14. The end of the cylinder assembly 7 near the feed port 101 is sealed to the sealing ring 1305, and the end of the cylinder assembly 7 near the discharge port 102 is sealed to the valve seat 15. A first working medium cavity 20 is formed between the sealing ring 1305, the outer wall of the cylinder assembly 7, and the inner wall of the housing 14. When the valve stem assembly is in the open position, the working medium enters the first working medium cavity 20 from the feed port 101 and is output to the discharge port 102.

[0084] The valve stem 2 passes through the cylinder assembly 7, with both ends extending out of the cylinder assembly 7. Specifically, the end of the valve stem 2 near the inlet 101 is connected to the auxiliary closing element 4, and the end of the valve stem 2 near the outlet 102 is connected to the valve core 3. A pressure relief structure is provided between the valve core 3 and the cylinder assembly 7. During the process of the valve stem assembly moving from the closed position to the open position, the valve core 3 moves towards the cylinder assembly 7. During this process, the working medium located between the valve core 3 and the cylinder assembly 7 will generate a certain resistance, slowing down the opening speed of the valve core 3. By setting the above-mentioned pressure relief structure, it is helpful for the rapid discharge of the working medium between the valve core 3 and the cylinder assembly 7, preventing pressure buildup, improving the response speed of the valve device, and enabling the valve device to open to its maximum stroke quickly and smoothly.

[0085] See Figure 1 As shown, a limiting step 707 is provided on the end face of the cylinder assembly 7 facing the valve core 3. When the end face of the valve core 3 facing the cylinder assembly 7 abuts against the limiting step 707, the valve stem assembly reaches the open position and the valve opens to the maximum stroke.

[0086] In one embodiment of this application, the pressure relief structure includes a pressure relief notch 8, which is disposed on the end face of the valve core 3 facing the cylinder assembly 7. During the process of the valve stem assembly moving from the closed position to the open position, part of the working medium between the valve core 3 and the cylinder assembly 7 is discharged through the pressure relief notch 8.

[0087] See Figure 9 As shown, the pressure relief structure includes a pressure relief notch 8, which is disposed on the end face of the valve core 3 facing the cylinder assembly 7. The number of pressure relief notches 8 is not limited, and multiple pressure relief notches 8 are spaced apart circumferentially along the valve core 3. Optionally, the multiple pressure relief notches 8 are evenly spaced circumferentially along the valve core 3. In this embodiment, three pressure relief notches 8 are provided, and the three pressure relief notches 8 are evenly spaced circumferentially along the valve core 3.

[0088] Specifically, the pressure relief notch 8 is recessed from the end face and outer wall of the valve core 3. The pressure relief notch 8 has openings on both the end face and outer wall of the valve core 3, and the two openings are connected to facilitate the discharge of the working medium. The inner wall of the pressure relief notch 8 is streamlined to allow the working medium to pass through the pressure relief notch 8 more smoothly, reduce local turbulence, and make the flow of the working medium more stable and faster, further improving the response speed of the valve device.

[0089] In one embodiment of this application, the cylinder assembly 7 includes an inner cylinder ring 701 and an outer cylinder ring 702. The inner cylinder ring 701 is disposed inside the outer cylinder ring 702. The valve stem 2 is sealed to the inner cylinder ring 701 by a first elastic energy storage seal 601, and the valve stem 2 is sealed to the outer cylinder ring 702 by a second elastic energy storage seal 602.

[0090] See Figure 7 As shown, the cylinder assembly 7 includes an inner cylinder ring 701 and an outer cylinder ring 702. The inner cylinder ring 701 is disposed inside the outer cylinder ring 702, and the inner cylinder ring 701 and the outer cylinder ring 702 are coaxially arranged. In one embodiment of this application, the inner wall of the outer cylinder ring 702 is provided with an assembly step, and the inner cylinder ring 701 is limited and installed inside the outer cylinder ring 702 by the assembly step. The inner cylinder ring 701 and the outer cylinder ring 702 can be connected by welding.

[0091] The outer ring 702 of the cylinder facing the feed port 101 is sealed to the sealing ring 1305. The valve stem 2 passes through the inner ring 701 of the cylinder. The valve stem 2 and the inner ring 701 of the cylinder are sealed by the first elastic energy storage seal 601. For example, the valve stem 2 and the inner ring 701 of the cylinder can be sealed by one, two, three or other first elastic energy storage seals 601.

[0092] See Figure 1 and Figure 2As shown, in one embodiment of this application, the valve stem 2 and the cylinder inner ring 701 are sealed by two first elastic energy storage seals 601, which are spaced apart. The first elastic energy storage seals 601 are fitted onto the outer wall of the valve stem 2 and are used to seal the gap between the valve stem 2 and the cylinder inner ring 701, reducing leakage of the working medium at this gap. Optionally, the first elastic energy storage seals 601 can be installed using components such as retaining rings and locking nuts to ensure that the first elastic energy storage seals 601 are securely disposed between the valve stem 2 and the cylinder inner ring 701.

[0093] Similarly, the first elastic energy storage seal 601 between the valve stem 2 and the cylinder inner ring 701 also adopts a spring energy storage seal ring. This spring energy storage seal ring has a simple structure, low cost and high stability. It is suitable for low temperature and ultra-low temperature conditions and can maintain reliable sealing performance for a long time, meeting the needs of rocket engine use.

[0094] The portion of the valve stem 2 extending out of the inner ring 701 of the cylinder is sealed to the outer ring 702 of the cylinder by a second elastic energy-storing seal 602. Specifically, the second elastic energy-storing seal 602 is sleeved on the outer wall of the valve stem 2. The second elastic energy-storing seal 602 is used to seal the gap between the valve stem 2 and the outer ring 702 of the cylinder, reducing leakage of the working medium at this gap. Optionally, the second elastic energy-storing seal 602 can be installed using components such as a retaining ring or a shaft elastic retaining ring to ensure that the second elastic energy-storing seal 602 is firmly set between the valve stem 2 and the outer ring 702 of the cylinder.

[0095] Compared to the first elastic energy storage seal 601, the radial dimension of the second elastic energy storage seal 602 is larger. Similarly, the second elastic energy storage seal 602 also employs a spring-loaded energy storage ring. This type of spring-loaded energy storage ring has a simple structure, low cost, and high stability, making it suitable for cryogenic and ultra-crescent-temperature conditions. It can maintain reliable sealing performance for extended periods, meeting the requirements of rocket engines.

[0096] In one embodiment of this application, a control air chamber 705 is provided between the inner cylinder ring 701 and the outer cylinder ring 702. An intake channel 704 is formed on the outer cylinder ring 702. For ease of structural arrangement, the axial direction of the intake channel 704 is set at an acute angle to the axial direction of the cylinder assembly. Correspondingly, an air inlet is provided on the housing 14, and a control air connector 19 is provided at the air inlet. The control air connector 19 is used to introduce or disconnect control air. When the control air is introduced, the valve device is opened; when the control air is disconnected, the valve device is closed, thereby realizing the starting and stopping functions of the engine combustor. Optionally, the control air is introduced into the position between the valve stem 2 and the inside of the outer cylinder ring 702, the outside of the inner cylinder ring 701, and between the first elastic energy storage seal 601 and the second elastic energy storage seal 602.

[0097] One end of the intake passage 704 is connected to the control air chamber 705, and the other end is connected to the control air connector 19. External control air can enter the intake passage 704 through the control air connector 19, and then enter the control air chamber 705. The control air entering the control air chamber 705 generates air pressure, which applies a force to the valve stem 2, pushing the valve stem assembly to move toward the open position.

[0098] In one embodiment of this application, a return spring 12 is provided between the valve stem 2 and the guide sleeve 1304. One end of the return spring 12 is connected to the valve stem 2, and the other end is connected to the guide sleeve 1304. When the valve device needs to be opened, control gas is introduced. Under the action of the control gas, the valve stem assembly moves from the closed position to the open position. During this process, the return spring 12 is compressed. When the valve device needs to be closed, the control gas is shut off, and the elastic restoring force of the return spring 12 acts on the valve stem assembly, causing the valve stem assembly to move from the open position to the closed position.

[0099] In one embodiment of this application, see [reference] Figure 3 As shown, a flange through hole 1306 is provided on the flange body 1303, and the axial direction of the flange through hole 1306 is set at an acute angle to the axial direction of the inlet flange assembly 13, so that the flange through hole 1306 is positioned to avoid the flow guide sleeve 1304. The number of flange through holes 1306 is not limited. In this embodiment, four flange through holes 1306 are provided, spaced apart circumferentially around the flange body 1303. Furthermore, the flange through holes 1306 are oblong holes, and the sum of the flow areas of each flange through hole 1306 is not less than the cross-sectional area of ​​the valve diameter. The feed port 101 communicates with the first working medium chamber 20 through the flange through hole 1306.

[0100] See Figure 5 and Figure 6As shown, the outer ring 702 of the cylinder is also provided with cylinder fluid passage holes 703. The number of cylinder fluid passage holes 703 is not limited. In this embodiment, four cylinder fluid passage holes 703 are provided, and the four cylinder fluid passage holes 703 are spaced apart around the circumference of the outer ring 702 of the cylinder. Furthermore, the cylinder fluid passage holes 703 are oblong holes, and the cylinder fluid passage holes 703 are connected by connecting ribs 706. The air intake channel 704 is formed at one of the connecting ribs 706.

[0101] See Figure 1 and Figure 2 As shown, a second working medium chamber 21 is formed between the end of the cylinder assembly 7 facing the discharge port 102 and the valve seat 15. The first working medium chamber 20 is connected to the second working medium chamber 21 through the cylinder liquid passage 703. The working medium enters the first working medium chamber 20 from the feed port 101 through the flange liquid passage 1306, then enters the second working medium chamber 21 through the cylinder liquid passage 703, and is then output from the discharge port 102.

[0102] In one embodiment of this application, the valve device further includes a drain structure, which includes an air blowing channel 1301 and a drain channel 1302. The air blowing channel 1301 and the drain channel 1302 are disposed on the inlet flange assembly 13. A portion of the inner wall of the inlet flange assembly 13, a portion of the inner wall of the cylinder assembly 7, and a portion of the outer wall of the valve stem 2 together form a drain chamber 9. The air blowing channel 1301 and the drain channel 1302 are both connected to the drain chamber 9.

[0103] To ensure the safety performance of the valve device, except for the inlet 101, the first working medium chamber 20, the second working medium chamber 21, and the outlet 102, no other areas of the valve device should accumulate working medium. Otherwise, in low-temperature or ultra-low-temperature working environments, leaking working medium is prone to freezing, causing safety hazards.

[0104] Therefore, the valve device also includes a drainage structure, which is used to drain the working medium that leaks into other areas of the valve device except for the inlet 101, the first working medium chamber 20, the second working medium chamber 21 and the outlet 102, thereby improving the reliability of the dynamic seal of the valve device.

[0105] See Figure 4As shown, the drainage structure includes an air blowing channel 1301 and a drainage channel 1302, both located on the flange body 1303. For ease of layout, both the air blowing channel 1301 and the drainage channel 1302 consist of two perpendicular sections, and both are L-shaped channels. Optionally, the air blowing channel 1301 and the drainage channel 1302 are axially symmetrically arranged with respect to the inlet flange assembly 13 to facilitate the discharge of the working medium. An air blowing nozzle 17 is provided at the inlet of the air blowing channel 1301, suitable for blowing in low-pressure isolation gas. A drainage nozzle 18 is provided at the outlet of the drainage channel 1302, through which the blown-out working medium is discharged from the valve device. By setting up a drainage mechanism, even if a small amount of working medium leaks, it can be blown out through the drainage channel 1302 by the low-pressure isolation gas introduced through the air blowing channel 1301, ensuring the safe use of the valve device.

[0106] The inlet of the air blowing channel 1301 can be welded to the air blowing nozzle 17. Similarly, the outlet of the drain channel 1302 can be welded to the drain nozzle 18. During assembly, the flange assembly 13 is welded to the air blowing nozzle 17 and the drain nozzle 18, and then to the guide sleeve 1304. The flange body 1303 and the guide sleeve 1304 are fitted together by mutually mating stepped holes. After the flange body 1303 is welded to the air blowing nozzle 17, the drain nozzle 18, and the guide sleeve 1304, a sealing ring 1305 is welded on. The sealing ring 1305 and the flange body 1303 are also fitted together by mutually mating stepped holes. The sealing ring 1305 has a tapered hole to avoid the air blowing channel 1301 and the drain channel 1302.

[0107] See Figure 1 As shown, a portion of the inner wall of the inlet flange assembly 13, a portion of the inner wall of the cylinder assembly 7, and a portion of the outer wall of the valve stem 2 together form a drain chamber 9. The return spring 12 is disposed in the drain chamber 9. The air blowing channel 1301 and the drain channel 1302 are both connected to the drain chamber 9.

[0108] A first elastic energy storage seal 601 is provided between the outer wall of the auxiliary closing element 4 and the inner wall of the guide sleeve 1304. However, during the operation of the valve device, the working medium entering the feed port 101 may still seep into the drain chamber 9 through the gap between the outer wall of the auxiliary closing element 4 and the inner wall of the guide sleeve 1304. At this time, the leaked working medium can be discharged through the drain structure to prevent the leaked working medium from freezing under low temperature conditions, which could damage other parts and cause safety problems, thereby providing safety and reliability for the operation of the valve device.

[0109] In one embodiment of this application, the valve stem 2 has a valve stem cavity 201 inside, and a liquid inlet hole 202 is formed on a portion of the side wall of the valve stem 2 placed inside the cylinder assembly 7. The liquid inlet hole 202 communicates with the valve stem cavity 201. A liquid outlet hole 203 is formed on a portion of the side wall of the valve stem 2 placed in the drain cavity 9. The liquid outlet hole 203 communicates with the valve stem cavity 201 and the drain cavity 9.

[0110] See Figure 1 and Figure 2 As shown, the valve stem 2 is hollow inside, forming a valve stem cavity 201. On the one hand, this can reduce the weight of the valve stem 2 and reduce the weight of the valve device. On the other hand, the valve stem cavity 201 can also discharge the leaked working medium.

[0111] Specifically, a liquid inlet hole 202 is formed on the side wall of the valve stem 2 located inside the cylinder inner ring 701. The liquid inlet hole 202 communicates with the valve stem cavity 201. Two first elastic energy storage seals 601 are provided between the outer wall of the valve stem 2 and the inner wall of the cylinder inner ring 701. In one embodiment of this application, the liquid inlet hole 202 is located on the side wall of the valve stem 2 between the two first elastic energy storage seals 601. During the operation of the valve device, the working medium in the second working medium cavity 21 may seep in from the gap between the outer wall of the valve stem 2 and the inner wall of the cylinder inner ring 701. This seeped working medium can enter the liquid inlet hole 202 and then enter the valve stem cavity 201.

[0112] A liquid outlet hole 203 is formed on a portion of the side wall of the valve stem 2 located in the drain chamber 9. The liquid outlet hole 203 communicates with the valve stem cavity 201 and also communicates with the drain chamber 9. The working medium entering the valve stem cavity 201 can enter the drain chamber 9 through the liquid outlet hole 203, and then be discharged from the valve device through the drain structure.

[0113] In addition, the working medium in the second working medium chamber 21 may also seep directly into the drain chamber 9 through the two first elastic energy storage seals 601 between the outer wall of the valve stem 2 and the inner wall of the cylinder inner ring 701, and the second elastic energy storage seal 602 between the outer wall of the valve stem 2 and the inner wall of the cylinder outer ring 702. At this time, the leaked working medium can be discharged through the drain structure.

[0114] In one embodiment of this application, the auxiliary closing element 4 is hollow inside.

[0115] See Figure 1 and Figure 2 As shown, the auxiliary closing component 4 has a hollow internal structure, which can reduce the weight of the valve device and improve the dynamic response speed of the valve device, thereby improving the performance of the valve device.

[0116] In one embodiment of this application, the auxiliary closing member 4 has a flow guiding structure at the end facing the feed inlet 101.

[0117] One end of the auxiliary closing element 4 is positioned facing the feed inlet 101, and the other end is connected to the valve stem 2. The end of the auxiliary closing element 4 facing the feed inlet 101 has a flow guiding structure. The working medium entering from the feed inlet 101 will contact the flow guiding structure. The flow guiding structure can guide the working medium to enter the first working medium cavity 20 more smoothly, reduce turbulence and local resistance, reduce energy loss, increase fluid velocity, and maintain the flow stability of the working medium.

[0118] Specifically, the auxiliary shut-off element 4 has a guide end and a connecting end. The guide end of the auxiliary shut-off element 4 is positioned towards the feed inlet 101. Part of the working medium entering from the feed inlet 101 will contact the guide end and then flow towards the discharge outlet 102. The connecting end of the auxiliary shut-off element 4 is connected to the valve stem 2 to achieve synchronous movement between the auxiliary shut-off element 4 and the valve stem 2.

[0119] See Figure 1 and Figure 2 As shown, in one embodiment of this application, the guide end of the auxiliary shut-off member 4 is a conical structure, with the tip of the guide end facing the feed inlet 101. The guide structure is the conical surface of this conical structure. This guide structure is relatively simple and easy to manufacture and install. The working medium entering from the feed inlet 101 will flow along the streamlined conical surface of this guide structure, avoiding fluid obstruction or turbulence, and making the flow of the working medium more stable.

[0120] In one embodiment of this application, the valve device further includes an adaptive adjustment mechanism, which is disposed at the connection position between the valve stem 2 and the valve core 3. The adaptive adjustment mechanism is used to adjust the alignment between the valve core 3 and the discharge port 102 when the valve stem assembly moves from the open position to the closed position.

[0121] See Figure 1 , Figure 2 and Figure 8 As shown, the valve seat 15 includes a valve seat body 1501, which is made of metal. An assembly groove is formed on the side of the valve seat body 1501 facing the valve stem assembly. This assembly groove is annular, and an elastic seal 1502, made of elastic non-metallic material, is disposed within it. Under normal to ultra-low temperature conditions, the elastic seal 1502 can be stably and reliably disposed within the assembly groove, exhibiting a long service life and high reliability. The end face of the valve core 3 facing the outlet 102 is a conical structure with an arc, which can fit snugly against the elastic seal 1502 to achieve valve sealing closure. The nominal diameter of the valve seat 15 should be the same as the nominal diameter of the valve device; the specific nominal diameter parameters are determined according to the product design input.

[0122] In addition, two symmetrically distributed set screw holes are provided on the valve seat body 1501 to facilitate the disassembly of the valve seat 15 and the housing 14.

[0123] See Figure 1 and Figure 2 As shown, in this embodiment, the valve stem 2 and the valve core 3 are not rigidly connected. The valve stem 2 and the valve core 3 are connected through an adaptive adjustment mechanism, that is, the valve core 3 is movably connected to the valve stem 2. The valve core 3 has a certain range of motion relative to the valve stem 2. When the valve stem assembly moves from the open position to the closed position, the adaptive adjustment mechanism can adjust the alignment of the valve core 3 with the discharge port 102 so that the valve core 3 is aligned with the discharge port 102 (self-alignment), making it easier for the valve core 3 to fit the elastic seal 1502 of the valve seat 15, thereby improving the closing reliability of the valve core 3.

[0124] In one embodiment of this application, the adaptive adjustment mechanism includes an annular mounting groove 10 and a plurality of rolling elements 11. The rolling elements 11 are rotatably disposed in the annular mounting groove 10. The annular mounting groove 10 is arranged circumferentially around the valve stem 2. Part of the structure of the annular mounting groove 10 is formed on the outer wall of the valve stem 2, and the remaining part is formed on the inner wall of the valve core 3.

[0125] See Figure 1 and Figure 2 The adaptive adjustment mechanism includes an annular mounting groove 10 and several rolling elements 11. The annular mounting groove 10 is arranged circumferentially around the valve stem 2, and its radial cross-sectional shape is circular. The annular mounting groove 10 is composed of two groove structures, one of which is located on the outer wall of the valve stem 2, and the other is located on the inner wall of the valve core 3. (See reference...) Figure 9 As shown, the groove structure formed on the inner wall of the valve core 3 is the valve core groove 301.

[0126] The rolling element 11 is rotatably disposed in the annular mounting groove 10. The rolling element 11 is made of steel ball. The number of rolling elements 11 is not limited. In this embodiment, nine rolling elements 11 are disposed in the annular mounting groove 10.

[0127] When the valve device is opened and closed, the force between the valve stem 2 and the valve core 3 can be transmitted through the rolling element 11, so that the valve core 3 and the valve stem 2 move synchronously. The rolling element 11 has a certain amount of movement in the annular mounting groove 10, so that the valve core 3 has a certain range of movement relative to the valve stem 2, which improves the fit between the valve core 3 and the elastic seal 1502 when the valve core 3 is closed and seated, and improves the reliability of valve closure.

[0128] In addition, to further enhance the sealing performance of the valve device, sealing gaskets 16 are provided between the flange body 1303 and the housing 14, between the sealing ring 1305 and the cylinder outer ring 702, between the housing 14 and the valve seat 15, and between the housing 14 and the control air connector 19.

[0129] The components and structural parts in the valve device of this application are independent of each other in structure and function, and can be processed, assembled, tested and stored separately. One or more of them can be quickly replaced according to product maintenance or product function changes.

[0130] The opening, closing, and draining processes of the valve device of this application are described below with reference to the accompanying drawings:

[0131] Taking the initial state of the valve device as Figure 1 Taking the closed state as an example, the valve stem assembly is in the closed position at this time.

[0132] When the valve needs to be opened, control air is supplied through the control air connector 19. The control air enters the control air chamber 705 through the air inlet channel 704. The control air pushes the valve stem 2 in the direction shown by arrow b. When this pushing force is greater than the resistance of the working medium at the valve core 3 and the elastic force of the return spring 12, the entire valve stem assembly moves in the direction shown by arrow b, moving from the closed position to the open position, and the return spring 12 is compressed. When the valve core 3 abuts against the limiting step 707 of the cylinder assembly 7, the valve stem assembly reaches its maximum stroke position, that is, the valve stem assembly reaches the open position, and the valve device opens. (See reference...) Figure 2 As shown, the working medium at the inlet 101 enters the first working medium chamber 20 through the flange liquid passage 1306, then enters the second working medium chamber 21 through the cylinder liquid passage 703, and is then output from the outlet 102.

[0133] When the valve device needs to be closed, the supply of control air to the control air connector 19 is stopped. The restoring force of the return spring 12 applies a force to the valve stem 2 in the direction shown by arrow a. At the same time, the working medium at the feed inlet 101 continues to flow to the auxiliary closing element 4, applying liquid pressure to the auxiliary closing element 4 in the direction shown by arrow a. The auxiliary closing element 4 applies an auxiliary closing force to the valve stem 2. The restoring force of the return spring 12 and the auxiliary closing force of the auxiliary closing element 4 work together on the valve stem 2. When the above two forces are greater than the resistance of the working medium at the valve core 3, the entire valve stem assembly moves in the direction shown by arrow a, and the valve stem assembly moves from the open position to the closed position. As the valve core 3 gradually approaches the valve seat 15, the valve core 3 can have a certain amount of movement relative to the valve stem 2. The valve core 3 will automatically center the discharge port 102, making it easier for the valve core 3 to fit the elastic seal 1502. When the valve stem assembly reaches the closed position, the auxiliary closing member 4 continues to apply an auxiliary closing force to the valve stem 2, eliminating any gaps that may exist between the valve core 3 and the elastic seal 1502, making the valve core 3 fit the elastic seal 1502 more tightly, and the valve device closes. (See reference...) Figure 1 As shown, the working medium is no longer output from the discharge port 102.

[0134] When drainage is required, low-pressure isolation gas is introduced into the air blowing nozzle 17. The low-pressure isolation gas enters the drainage chamber 9 through the air blowing channel 1301. The leaking working medium accumulated in the drainage chamber 9 is blown to the drainage channel 1302 and then discharged from the valve device through the drainage nozzle 18.

[0135] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0136] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A valve device, characterized in that, The valve device includes: The housing assembly has an inlet (101) and an outlet (102). A valve stem assembly is disposed within the housing assembly. The valve stem assembly has an open position and a closed position, and the valve stem assembly can reciprocate between the open position and the closed position. The valve stem assembly includes a valve stem (2), a valve core (3), and an auxiliary closing element (4). The valve core (3) is disposed at one end of the valve stem (2) near the outlet (102), and the auxiliary closing element (4) is disposed at one end of the valve stem (2) near the inlet (101). The auxiliary closing element (4) applies an auxiliary closing force to the valve stem (2) under the action of the working medium. The housing assembly includes an inlet flange assembly (13), and the auxiliary closing element (4) is at least partially located within the inlet flange assembly (13); It also includes a cylinder assembly (7), which is disposed within the housing assembly, and the valve stem (2) passes through the cylinder assembly (7). It also includes a drainage structure, which includes an air blowing channel (1301) and a drainage channel (1302). The air blowing channel (1301) and the drainage channel (1302) are disposed on the inlet flange assembly (13). A portion of the inner wall of the inlet flange assembly (13), a portion of the inner wall of the cylinder assembly (7) and a portion of the outer wall of the valve stem (2) together form a drainage chamber (9). The air blowing channel (1301) and the drainage channel (1302) are both connected to the drainage chamber (9). The valve stem (2) has a valve stem cavity (201) inside. A liquid inlet hole (202) is formed on a part of the side wall of the valve stem (2) inside the cylinder assembly (7). The liquid inlet hole (202) communicates with the valve stem cavity (201). A liquid outlet hole (203) is formed on a part of the side wall of the drain cavity (9). The liquid outlet hole (203) communicates with the valve stem cavity (201) and the drain cavity (9).

2. The valve device according to claim 1, characterized in that, It also includes a limiting structure disposed on the housing assembly and the valve stem assembly, the limiting structure being used to prevent the valve stem assembly from dislodging from the inlet (101) of the housing assembly.

3. The valve device according to claim 2, characterized in that, The limiting structure includes a limiting protrusion (501) and a limiting boss (502) that can abut against each other. One of the limiting protrusion (501) and the limiting boss (502) is disposed on the outer wall of the auxiliary closing member (4), and the other is disposed on the inner wall of the inlet flange assembly (13).

4. The valve device according to claim 3, characterized in that, The auxiliary closing element (4) is sealed to the inlet flange assembly (13) by a first elastic energy storage seal (601).

5. The valve device according to claim 1, characterized in that, A pressure relief structure is provided between the valve core (3) and the cylinder assembly (7).

6. The valve device according to claim 5, characterized in that, The pressure relief structure includes a pressure relief notch (8), which is located on the end face of the valve core (3) facing the cylinder assembly (7). During the process of the valve stem assembly moving from the closed position to the open position, part of the working medium between the valve core (3) and the cylinder assembly (7) is discharged through the pressure relief notch (8).

7. The valve device according to claim 5, characterized in that, The cylinder assembly (7) includes an inner cylinder ring (701) and an outer cylinder ring (702). The inner cylinder ring (701) is disposed inside the outer cylinder ring (702). The valve stem (2) is sealed to the inner cylinder ring (701) by a first elastic energy storage seal (601), and the valve stem (2) is sealed to the outer cylinder ring (702) by a second elastic energy storage seal (602).

8. The valve device according to claim 1, characterized in that, The auxiliary closing element (4) is hollow inside.

9. The valve device according to claim 1, characterized in that, The auxiliary closing element (4) has a flow guiding structure at one end facing the feed inlet (101).

10. The valve device according to any one of claims 1-9, characterized in that, It also includes an adaptive adjustment mechanism, which is located at the connection position of the valve stem (2) and the valve core (3). The adaptive adjustment mechanism is used to adjust the alignment between the valve core (3) and the discharge port (102) when the valve stem assembly moves from the open position to the closed position.

11. The valve device according to claim 10, characterized in that, The adaptive adjustment mechanism includes an annular mounting groove (10) and several rolling elements (11). The rolling elements (11) are rotatably disposed in the annular mounting groove (10). The annular mounting groove (10) is arranged around the circumference of the valve stem (2). Part of the structure of the annular mounting groove (10) is formed on the outer wall of the valve stem (2), and the remaining part is formed on the inner wall of the valve core (3).

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