Stop valve and liquid rocket engine

Abstract

This application relates to the technical field of aerospace engineering, and more particularly to a shut-off valve and a liquid rocket engine. The shut-off valve includes a valve body with a placement chamber, an inlet, a first medium channel, and a second medium channel. The first medium channel is connected to the inlet, and the second medium channel is connected to the first medium channel through the placement chamber. A valve stem is movably disposed in the placement chamber. A valve core is connected to the valve stem. When the valve stem moves the valve core to a first position, the first medium channel opens and the second medium channel closes; when the valve stem moves the valve core to a second position, the first medium channel closes and the second medium channel opens. A regulating part is disposed in the placement chamber, which regulates the flow rate of the liquid medium delivered from the inlet to the first medium channel when the first medium channel is open. This allows the shut-off valve to also regulate the flow rate of the liquid medium, improving its integration.

Description

Technical Field

[0001] This application relates to the technical field of aerospace engineering, and more particularly to a shut-off valve and a liquid rocket engine. Background Technology

[0002] With the increasingly frequent space activities of major spacefaring nations worldwide, the development of reusable launch vehicles is also accelerating. Currently, the most common and effective rocket recovery methods rely on a key technology: adjusting the propellant flow rate to achieve a wide range of thrust regulation for the main engine.

[0003] A traditional variable-thrust liquid rocket engine propellant supply system typically includes one two-position three-way pneumatic shut-off valve, one flow regulating valve, and one control solenoid valve. The two-position three-way pneumatic shut-off valve is used to switch between the precooling path and the main path, the flow regulating valve is used to regulate the propellant supply flow rate in the main path, and the control solenoid valve is used to provide control gas. It can be seen that traditional valves have a low degree of integration, resulting in a complex piping system, a large number of engine components, a heavy overall structure, and poor stability when multiple components are combined.

[0004] Therefore, it is necessary to propose a shut-off valve and a liquid rocket engine to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0007] Therefore, in a first aspect, the present invention provides a shut-off valve.

[0008] A second aspect of the present invention provides a liquid rocket engine.

[0009] In view of this, a shut-off valve is provided according to a first aspect embodiment of this application, comprising:

[0010] The shut-off valve body has a placement chamber, an inlet, a first medium channel, and a second medium channel, wherein the first medium channel is connected to the inlet, and the second medium channel is connected to the first medium channel through the placement chamber.

[0011] The valve stem is movably disposed in the aforementioned placement cavity;

[0012] The valve core is connected to the valve stem mentioned above;

[0013] Specifically, when the valve stem moves the valve core to the first position, the first medium channel opens and the second medium channel closes; when the valve stem moves the valve core to the second position, the first medium channel closes and the second medium channel opens.

[0014] An adjustment unit is provided in the placement cavity. When the first medium channel is open, the adjustment unit adjusts the flow rate of the liquid medium delivered from the inlet to the first medium channel.

[0015] In one feasible implementation, the aforementioned shut-off valve body includes:

[0016] The valve body has the aforementioned inlet and the aforementioned first medium passage;

[0017] An end cap is connected to the valve body, the end cap forms the second medium channel, and the valve body and the end cap together form the placement cavity.

[0018] A connector is provided at the connection between the valve body and the end cap.

[0019] In one feasible implementation, the connecting member is a bolt, the valve body has a first threaded hole, the end cap has a second threaded hole at a relative position, and the bolt is screwed into the first threaded hole and the second threaded hole respectively.

[0020] In one feasible implementation, a first through hole is provided along the axial direction of the valve stem, and a flow passage is provided in the valve core, the flow passage being connected to the first through hole.

[0021] A second through hole is provided radially along the valve stem, the second through hole being connected to the first through hole, and the second through hole being used to connect to the second medium channel.

[0022] In one feasible implementation, the adjustment unit includes:

[0023] A sleeve is disposed in the aforementioned placement cavity, and the sleeve is connected to the aforementioned valve stem via an elastic element;

[0024] A valve seat is disposed in the aforementioned placement cavity, with one end of the valve seat connected to the aforementioned end cap and the other end connected to the aforementioned valve body. The valve seat has an adjustment window located between the aforementioned inlet and the aforementioned first medium channel.

[0025] When the first medium channel is open, the valve stem drives the sleeve to move via the elastic element to adjust the size of the adjustment window.

[0026] In one feasible implementation, the elastic element is a spring, the valve stem is provided with a first stepped surface, the sleeve is provided with a second stepped surface, one end of the spring is connected to the first stepped surface, and the other end is connected to the second stepped surface.

[0027] In one feasible implementation, the above-mentioned shut-off valve further includes:

[0028] A drive motor is located at the end of the end cap away from the valve body. The output shaft of the drive motor is connected to the valve stem and is used to drive the valve stem to move toward or away from the sleeve.

[0029] In one feasible implementation, the above-mentioned shut-off valve further includes:

[0030] A stopper ring is disposed at the connection between the valve stem and the end cap; and / or

[0031] Located at the connection between the valve stem and the valve seat; and / or

[0032] It is installed at the connection between the valve stem and the sleeve.

[0033] In one feasible implementation, the above-mentioned shut-off valve further includes:

[0034] The unloading port is opened on the periphery of the aforementioned sleeve and / or on the periphery of the aforementioned valve seat.

[0035] A liquid rocket engine is provided according to a second aspect of this application, comprising:

[0036] The shut-off valve as described in any of the above technical solutions.

[0037] Compared to existing technologies, the present invention offers at least the following advantages: The shut-off valve provided in this application includes a shut-off valve body, a valve stem, a valve core, and an adjusting part. The shut-off valve body has a placement chamber, an inlet, a first medium channel, and a second medium channel. Specifically, the inlet is connected to the first medium channel, and the first and second medium channels are connected through the placement chamber. The valve stem is movably disposed in the placement chamber, and the valve core is connected to the valve stem. With this configuration, when the valve stem moves the valve core to a first position, the first medium channel opens, and the second medium channel closes. Liquid medium can enter the shut-off valve body from the inlet and flow out from the first medium channel. When the valve stem moves the valve core to a second position, the first medium channel closes, and the second medium channel opens. Liquid medium can enter the placement chamber from the inlet and be transported along the valve stem to the second medium channel, and then flow out from the second medium channel. This forms a two-position, three-way flow pattern. Furthermore, the adjusting part is disposed in the placement chamber, located between the inlet and the first medium channel. When the first medium channel is open, the flow rate of the liquid medium transported from the inlet to the first medium channel can be adjusted by the adjusting part. This allows the shut-off valve to also have a regulating function, improving the integration of the shut-off valve, reducing the complexity of the piping system, and ensuring the stability of the operation of various components of the liquid rocket engine. Attached Figure Description

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0039] Figure 1 A schematic structural diagram illustrating one working state of a shut-off valve provided in an embodiment of this application;

[0040] Figure 2 This is a schematic structural diagram illustrating another working state of a shut-off valve provided in an embodiment of this application.

[0041] in, Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0042] 1. Valve body, 2. End cover, 3. Valve seat, 4. Valve stem, 5. Valve core, 6. Sleeve, 7. Spring, 8. Drive motor, 9. Plug ring, 11. Inlet, 12. First medium channel, 13. Second medium channel, 14. Adjustment window, 15. Unloading port. Detailed Implementation

[0043] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0044] like Figure 1 and Figure 2 As shown, a shut-off valve is provided according to a first aspect embodiment of this application, comprising: a shut-off valve body having a placement cavity, an inlet 11, a first medium channel 12, and a second medium channel 13, wherein the first medium channel 12 is connected to the inlet 11, and the second medium channel 13 is connected to the first medium channel 12 through the placement cavity; a valve stem 4 movably disposed in the placement cavity; a valve core 5 connected to the valve stem 4; wherein, when the valve stem 4 moves the valve core 5 to a first position, the first medium channel 12 is opened and the second medium channel 13 is closed; when the valve stem 4 moves the valve core 5 to a second position, the first medium channel 12 is closed and the second medium channel 13 is opened; and an adjustment part disposed in the placement cavity, wherein, when the first medium channel 12 is open, the adjustment part adjusts the flow rate of the liquid medium delivered from the inlet 11 to the first medium channel 12.

[0045] It is understood that the shut-off valve provided in this application embodiment includes a shut-off valve body, a valve stem 4, a valve core 5, and an adjusting part. The shut-off valve body has a placement chamber, an inlet 11, a first medium channel 12, and a second medium channel 13. Specifically, the inlet 11 is connected to the first medium channel 12, and the first medium channel 12 and the second medium channel 13 are connected through the placement chamber. The valve stem 4 is movably disposed in the placement chamber, and the valve core 5 is connected to the valve stem 4. With this configuration, when the valve stem 4 moves the valve core 5 to the first position, the first medium channel 12 opens, and the second medium channel 13 closes. Liquid medium can enter the shut-off valve body from the inlet 11 and flow out from the first medium channel 12. When the valve stem 4 moves the valve core 5 to the second position, the first medium channel 12 closes, and the second medium channel 13 opens. Liquid medium can enter the placement chamber from the inlet 11 and be transported along the valve stem 4 to the second medium channel 13, and then flow out from the second medium channel 13. This forms a two-position, three-way flow pattern. Furthermore, the regulating unit is disposed in the placement cavity, located between the inlet 11 and the first medium channel 12. When the first medium channel 12 is open, the flow rate of the liquid medium delivered from the inlet 11 to the first medium channel 12 can be adjusted through the regulating unit. This allows the shut-off valve to also have a regulating function, improving the integration of the shut-off valve, reducing the complexity of the piping system, and ensuring the stability of the operation of various components of the liquid rocket engine.

[0046] It is understandable that the first medium channel 12 is the main channel of the shut-off valve, and the second medium channel 13 is the pre-cooling channel of the shut-off valve. Therefore, the flow area of ​​the first medium channel 12 is larger than that of the second medium channel 13. In cases where the shut-off valve is connected to a liquid rocket engine, the liquid medium can be propellant.

[0047] In some examples, such as Figure 1 and Figure 2 As shown, the aforementioned shut-off valve body includes: a valve body 1, which has the aforementioned inlet 11 and the aforementioned first medium channel 12; an end cap 2, which is connected to the aforementioned valve body 1, which has the aforementioned second medium channel 13, and the aforementioned valve body 1 and the aforementioned end cap 2 together form the aforementioned placement cavity; and a connector, which is disposed at the connection between the aforementioned valve body 1 and the aforementioned end cap 2.

[0048] It is understood that the gate valve body includes a valve body 1, an end cap 2, and a connector. Specifically, the valve body 1 can be connected to the end cap 2 via the connector to ensure a tight connection and improve the working stability of the gate valve. The valve core 5 is located in the first placement cavity, the inlet 11 is located on the side of the valve body 1, and the first medium channel 12 is located at the bottom of the valve body 1 and is coaxially arranged with the first placement cavity. The end cap 2 forms a second placement cavity and a second medium channel 13. The second medium channel 13 is located on the side of the end cap 2, and when the end cap 2 is connected to the valve body 1, the first placement cavity and the second placement cavity are coaxially connected. This arrangement allows the valve stem 4 to move along the axis of the placement part and drive the valve core 5 to move. When the valve core 5 moves towards the valve body 1 and abuts against the inlet 11 of the first medium channel 12, the valve core 5 moves to the first position, blocking the first medium channel 12. At this time, the liquid medium enters the placement cavity from the inlet 11 and is transported to the second medium channel 13 along the valve stem 4. When the valve core 5 moves toward the end cover 2 to block the placement cavity, the valve core 5 moves to the second position. At this time, the liquid medium enters from the inlet 11 and enters the first medium channel 12.

[0049] Understandably, the surfaces of the valve core 5 that come into contact with the valve body 1 are all sealing surfaces, and the surfaces of the valve stem 4 that connect with the sleeve 6 are also sealing surfaces, in order to prevent leakage of liquid media and improve reliability.

[0050] In some examples, the connecting element is a bolt, the valve body 1 has a first threaded hole, the end cap 2 has a second threaded hole at a relative position, and the bolt is screwed into the first threaded hole and the second threaded hole respectively.

[0051] Understandably, bolts can be used as the connecting parts. A first threaded hole can be formed on the end face of the valve body 1 near the end cover 2, and a second threaded hole can be formed on the end face of the end cover 2 near the valve body 1. The first and second threaded holes are coaxially arranged. Bolts are screwed into the first and second threaded holes respectively to ensure a tight connection between the valve body 1 and the end cover 2, improving the operational stability and reliability of the shut-off valve. Furthermore, multiple bolts can be provided, with the number of first and second threaded holes corresponding to the number of bolts, further enhancing the connection's tightness.

[0052] In some examples, such as Figure 1 and Figure 2 As shown, a first through hole is provided along the axial direction of the valve stem 4, and a flow hole is provided in the valve core 5, which is connected to the first through hole; a second through hole is provided along the radial direction of the valve stem 4, which is connected to the first through hole, and the second through hole is used to connect to the second medium channel 13.

[0053] It is understood that a first through hole can be formed along the axial direction of the valve stem 4, and a flow passage hole is formed on the circumference of the valve core 5, which connects to the first through hole. Furthermore, a second through hole is formed in the radial direction of the valve stem 4, which connects to the first through hole. When the valve stem 4 moves the valve core 5 to the second position, the second through hole connects to the second medium channel 13. With this configuration, when the valve stem 4 moves the valve core 5 to the second position, the liquid medium enters from the inlet 11, enters the first through hole through the flow passage hole, is transported along the first through hole towards the end cover 2, and is then transported to the second medium channel 13 through the second through hole. This simplifies the overall structure of the shut-off valve, eliminates the need for additional transmission paths, and improves the reliability of the shut-off valve.

[0054] In some examples, such as Figure 1 and Figure 2 As shown, the adjustment part includes: a sleeve 6 disposed in the placement cavity, and the sleeve 6 is connected to the valve stem 4 via an elastic element; a valve seat 3 disposed in the placement cavity, one end of the valve seat 3 is connected to the end cap 2, and the other end is connected to the valve body 1, the valve seat 3 has an adjustment window 14, the adjustment window 14 is located between the inlet 11 and the first medium channel 12; wherein, when the first medium channel 12 is open, the valve stem 4 drives the sleeve 6 to move via the elastic element to adjust the size of the adjustment window 14.

[0055] Understandably, the adjusting section includes a sleeve 6 and a valve seat 3. The sleeve 6 is located in the placement cavity and fits onto the valve stem 4, with an elastic element positioned between the sleeve 6 and the valve stem 4. The valve seat 3 is located in the placement cavity, with one end connected to the end cap 2 and the other end connected to the valve body 1, thus fixing the position of the valve seat 3 and improving stability. An adjusting window 14 is formed on the periphery of the valve seat 3 near the end of the first medium channel 12. The sleeve 6 abuts against the inner wall of the valve seat 3 and can slide along the axis of the valve seat 3. With this configuration, when the valve stem 4 moves, the elastic element can drive the sleeve 6 to move synchronously, thereby adjusting the relative position between the sleeve 6 and the adjusting window 14. Specifically, when the first medium channel 12 is open and the second medium channel 13 is closed, the valve stem 4 moves towards the inlet 11 of the first medium channel 12. The valve stem 4 applies pressure to the elastic element, and the compressed elastic element applies a thrust to the sleeve 6, causing the sleeve 6 to also move towards the inlet 11 of the first medium channel 12, thereby reducing the area of ​​the regulating window 14 and decreasing the flow rate of the liquid medium through the regulating window 14. Conversely, when the valve stem 4 moves away from the inlet 11 of the first medium channel 12, the valve stem 4 applies tension to the elastic element, and the extended elastic element applies tension to the sleeve 6, causing the sleeve 6 to also move away from the inlet 11 of the first medium channel 12, thereby increasing the area of ​​the regulating window 14 and increasing the flow rate of the liquid medium through the regulating window 14. This allows the shut-off valve to also have a regulating function, improving the integration of the shut-off valve, reducing the complexity of the piping system, and ensuring the stability of the operation of various components of the liquid rocket engine.

[0056] In some examples, such as Figure 1 and Figure 2 As shown, the elastic element is spring 7, the valve stem 4 is provided with a first stepped surface, the sleeve 6 is provided with a second stepped surface, one end of the spring 7 is connected to the first stepped surface, and the other end is connected to the second stepped surface.

[0057] Understandably, the elastic element can be a cylindrical helical compression spring 7. Correspondingly, the valve stem 4 has a first stepped surface, and the sleeve 6 has a second stepped surface in the direction of the first stepped surface. One end of the spring 7 is connected to the first stepped surface, and the other end of the spring 7 is connected to the second stepped surface, so as to provide sufficient force surface for the compression and extension of the spring 7 and improve the stability of the synchronous movement of the valve stem 4 and the sleeve 6.

[0058] In some examples, such as Figure 1 and Figure 2 As shown, the above-mentioned shut-off valve further includes: a drive motor 8, which is disposed at the end of the end cover 2 away from the valve body 1. The output shaft of the drive motor 8 is connected to the valve stem 4 and is used to drive the valve stem 4 to move towards or away from the sleeve 6.

[0059] Understandably, the gate valve is also equipped with a drive motor 8. Specifically, the drive motor 8 is located at the end of the end cover 2 away from the valve body 1, and the output shaft of the drive motor 8 is connected to the valve stem 4. The drive motor 8 drives the valve stem 4 to move along the axis of the placement cavity, so that the valve stem 4 moves closer to or away from the sleeve 6, thereby realizing the automatic switching of the opening or closing of the first medium channel 12 and the second medium channel 13. When the first medium channel 12 is open, the flow rate of the first medium channel 12 is automatically regulated. This improves the automation level of the gate valve and ensures more accurate and reliable operation.

[0060] For example, the drive motor 8 can be connected to the end cover 2 by means of a threaded connection, thereby improving the tightness of the connection between the drive motor 8 and the end cover 2, so as to ensure the stability of the operation of the drive motor 8.

[0061] The working process of the gate valve is as follows: Figure 1 As shown, the shut-off valve is in a state where the first medium channel 12 is open and the second medium channel 13 is closed. After the liquid medium enters the valve body 1 through the inlet 11, it passes through the regulating window 14 opened in the valve seat 3 and exits from the outlet of the first medium channel 12. At this time, the sleeve 6, under the force of the spring 7, moves in unison with the valve stem 4, and keeps the second medium channel 13 closed and sealed. When flow regulation is required, a displacement command is sent to the drive motor 8. The drive motor 8 drives the valve stem 4 to move, thereby causing the sleeve 6 to move axially along the placement cavity to the target position, controlling the opening of the regulating window 14 to change to the target value, thus realizing the flow regulation function.

[0062] like Figure 2 As shown, the shut-off valve is in a state where the second medium channel 13 is open and the first medium channel 12 is closed. After the liquid medium enters the valve body 1 from the inlet 11, it passes through the regulating window 14 and the flow holes on the valve core 5, then enters the valve stem 4, and finally passes through the first and second through holes inside the valve stem 4, exiting from the outlet of the second medium channel 13. When the shut-off valve needs to close the first medium channel 12, it sends a corresponding command to the drive motor 8, which drives the valve stem 4 to move towards the valve body 1. During the closing process of the first medium channel 12, the sleeve 6 is first limited by the valve body 1, and the valve stem 4 continues to move downwards against the force of the spring 7 until the valve core 5 is limited by the valve body 1, maintaining the first medium channel 12 closed and sealed, while simultaneously opening the second medium channel 13.

[0063] In some examples, the aforementioned shut-off valve further includes: a plug ring 9 disposed at the connection between the valve stem 4 and the end cap 2; and / or disposed at the connection between the valve stem 4 and the valve seat 3; and / or disposed at the connection between the valve stem 4 and the sleeve 6.

[0064] It is understandable that, such as Figure 1 and Figure 2As shown, the gate valve is also equipped with a sealing ring 9. Specifically, the sealing ring 9 can be installed at the connection between the valve stem 4 and the end cover 2, the connection between the valve stem 4 and the valve seat 3, and the connection between the valve stem 4 and the sleeve 6 to achieve a dynamic sealing function, ensure that the gate valve maintains a sealed state during operation, and improve the working stability and reliability of the gate valve.

[0065] In some examples, such as Figure 1 and Figure 2 As shown, the above-mentioned shut-off valve further includes: an unloading port 15, which is opened on the periphery of the above-mentioned sleeve 6, and / or opened on the periphery of the above-mentioned valve seat 3.

[0066] Understandably, the gate valve is also equipped with an unloading port 15. Specifically, the unloading port 15 is located on the periphery of the sleeve 6 and the periphery of the valve seat 3 to ensure stable and reliable operation of the gate valve.

[0067] According to a second aspect of this application, a liquid rocket engine is provided, comprising: a shut-off valve as described in any of the above technical solutions.

[0068] It is understandable that liquid rocket engines are equipped with the aforementioned shut-off valves, and therefore possess all the beneficial effects of such valves, which will not be elaborated upon here.

[0069] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0070] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A shut-off valve, characterized in that, include: A shut-off valve body has a placement cavity, an inlet, a first medium channel, and a second medium channel, wherein the first medium channel is connected to the inlet, and the second medium channel is connected to the first medium channel through the placement cavity; the shut-off valve body includes: a valve body having the inlet and the first medium channel; an end cap connected to the valve body having the second medium channel, and the valve body and the end cap together forming the placement cavity; and a connector disposed at the connection between the valve body and the end cap; The valve stem is movably disposed in the placement cavity; Valve core, connected to the valve stem; Specifically, when the valve stem moves the valve core to a first position, the first medium channel is opened and the second medium channel is closed; when the valve stem moves the valve core to a second position, the first medium channel is closed and the second medium channel is opened; a first through hole is provided along the axial direction of the valve stem, and a flow hole is provided in the valve core, the flow hole being connected to the first through hole; a second through hole is provided along the radial direction of the valve stem, the second through hole being connected to the first through hole, and the second through hole being used to connect to the second medium channel; An adjustment unit is disposed in the placement cavity. When the first medium channel is open, the adjustment unit adjusts the flow rate of the liquid medium delivered from the inlet to the first medium channel.

2. The shut-off valve according to claim 1, characterized in that, The connector is a bolt. The valve body has a first threaded hole, and the end cap has a second threaded hole at a relative position. The bolt is screwed into the first threaded hole and the second threaded hole respectively.

3. The shut-off valve according to claim 1, characterized in that, The adjustment unit includes: A sleeve is disposed in the placement cavity, and the sleeve is connected to the valve stem by an elastic element; A valve seat is disposed in the placement cavity, with one end of the valve seat connected to the end cap and the other end connected to the valve body. The valve seat has an adjustment window located between the inlet and the first medium channel. When the first medium channel is open, the valve stem drives the sleeve to move via the elastic element, thereby adjusting the size of the adjustment window.

4. The shut-off valve according to claim 3, characterized in that, The elastic element is a spring, the valve stem is provided with a first stepped surface, the sleeve is provided with a second stepped surface, one end of the spring is connected to the first stepped surface, and the other end is connected to the second stepped surface.

5. The shut-off valve according to claim 1, characterized in that, Also includes: A drive motor is located at the end of the end cap away from the valve body. The output shaft of the drive motor is connected to the valve stem and is used to drive the valve stem to move towards or away from the sleeve.

6. The shut-off valve according to claim 3, characterized in that, Also includes: A stopper ring is disposed at the connection between the valve stem and the end cap; and / or It is located at the connection between the valve stem and the valve seat; and / or It is located at the connection between the valve stem and the sleeve.

7. The shut-off valve according to claim 3, characterized in that, Also includes: The unloading port is opened on the periphery of the sleeve and / or on the periphery of the valve seat.

8. A liquid rocket engine, characterized in that, include: The shut-off valve as described in any one of claims 1 to 7.

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