T-valve and engine fire suppression system including same

Abstract

The present application aims to provide a T-type one-way valve and an engine fire extinguishing system comprising the same, which can reduce the wear of a sealing pair and effectively improve the service life. The T-type one-way valve comprises a valve body, a valve seat and a sealing ball. The valve body is formed in a T shape. The valve seat is installed at one end of the valve body in the transverse direction. The sealing ball is slidably received in the interior of the valve body in the transverse direction. The T-type one-way valve has two inlets in the transverse direction and one outlet in the longitudinal direction. An annular magnet is arranged between the valve body and the valve seat at one inlet of the valve body. The sealing ball can be switched between a first action state and a second action state. In the first action state, the sealing ball and the annular magnet form a magnetic assembly, so that the position of the sealing ball is fixed and cannot slide. In the second action state, the sealing ball slides away from the annular magnet to form a sealing pair with the valve body to seal the other inlet of the valve body.

Description

Technical Field

[0001] This invention relates to a T-type check valve and an engine fire suppression system including the same. The T-type check valve is used, for example, in an aircraft engine fire suppression system to achieve the functional requirement of the engine fire suppression system to extinguish fires twice on one side of the engine. Background Technology

[0002] The T-type check valve is a component of the aircraft engine fire suppression system. It consists of a valve body, valve seat, and sealing ball, and has two extinguishing agent inlets and one extinguishing agent outlet. The two extinguishing agent inlets of the T-type check valve are connected to two engine fire extinguishing cylinders, respectively. When one engine fire extinguishing cylinder releases extinguishing agent, the agent enters one extinguishing agent inlet of the T-type check valve and pushes the sealing ball to block the other extinguishing agent inlet, forming a seal. The extinguishing agent is then released from the T-type check valve's outlet to that engine. This allows the two engine fire extinguishing cylinders to extinguish a fire on one engine twice. The sealing performance between the sealing ball and the valve body and valve seat is a key characteristic of the T-type check valve and directly affects the engine fire suppression effect.

[0003] T-type check valves are typically installed horizontally. During taxiing and flight, the sealing ball inside the T-type check valve moves freely with the aircraft's attitude and acceleration. This causes continuous wear accumulation between the sealing ball and the valve body and seat, which may eventually lead to insufficient sealing between the sealing ball and the valve body and seat, affecting the service life of the T-type check valve. Summary of the Invention

[0004] In view of the above problems, the object of the present invention is to provide a T-type check valve that can reduce the wear of the sealing pair and effectively improve the service life, as well as an engine fire extinguishing system including the same.

[0005] To achieve the above-mentioned objective of the present invention, the present invention provides a T-type check valve, comprising: a valve body formed in a T-shape; a valve seat mounted on one lateral end of the valve body; and a sealing ball slidably housed inside the valve body. The T-type check valve has two lateral inlets and one longitudinal outlet. An annular magnet is disposed between the valve body and the valve seat at one of the valve body's inlets. The sealing ball is switchable between a first operating state and a second operating state. In the first operating state, the sealing ball and the annular magnet form a magnetic assembly, fixing the position of the sealing ball and preventing it from sliding. In the second operating state, the sealing ball slides away from the annular magnet to form a sealing pair with the valve body, sealing the other inlet of the valve body.

[0006] According to the T-type check valve of the present invention, since an annular magnet is provided between the valve body and the valve seat, the sealing ball can switch between a first operating state and a second operating state. In the first operating state, the sealing ball and the annular magnet form a magnetic component, so that the position of the sealing ball is fixed and cannot slide. Therefore, in the first operating state, the sealing ball is attracted to one side of the valve seat and will not roll freely under the action of external force, which can reduce the wear of the sealing pair formed by the sealing ball, the valve body and the valve seat, and effectively improve the service life.

[0007] Preferably, the valve seat is formed as a stepped cylindrical shape having a large diameter portion and a small diameter portion, the small diameter portion being inserted into the interior of the valve body, and the annular magnet being disposed between the small diameter portion and the valve body.

[0008] According to the present invention, the T-type check valve has an annular magnet sandwiched between the small diameter portion and the valve body, and the large diameter portion of the valve seat can axially limit the annular magnet, so that the annular magnet will not move axially and fall off.

[0009] Preferably, an inner diameter expansion portion is formed at the end of the valve body to increase the inner diameter, and the annular magnet is disposed at the transition portion between the large diameter portion and the small diameter portion between the inner diameter expansion portion and the small diameter portion.

[0010] According to the present invention, the enlarged inner diameter of the valve body and the transition step of the valve seat form a closed annular receiving groove, which realizes radial and axial bidirectional limiting of the annular magnet, so that the annular magnet has no radial displacement and no risk of falling out.

[0011] Preferably, an integral valve seat is integrally formed at the other lateral end of the valve body.

[0012] According to the T-type check valve of the present invention, the valve seat on one side is integrally formed with the valve body, thereby reducing independent parts, eliminating the need for press-fitting and welding assembly processes, reducing assembly errors, and improving the overall structural strength.

[0013] Preferably, the valve body is made of a non-magnetizable metal, the sealing ball is made of a magnetizable metal, and the valve seat is made of a non-magnetizable metal.

[0014] According to the present invention, the T-type check valve is made of a non-magnetizable metal, which can isolate the magnetic field generated by the annular magnet, and the sealing ball is made of a magnetizable metal, which can form a stable magnetic adsorption fit with the annular magnet.

[0015] Preferably, the T-type check valve is used in the engine fire suppression system of an aircraft.

[0016] According to the T-type check valve of the present invention, during normal taxiing and flight of the aircraft, the sealing ball is adsorbed on one side of the valve seat and does not roll freely with the aircraft's attitude and acceleration, which can reduce the wear of the sealing pair and effectively improve the service life.

[0017] Preferably, in the first operating state, the magnetic force between the sealing ball and the annular magnet is greater than the inertial force generated on the sealing ball under the maximum acceleration of the aircraft; in the second operating state, when the extinguishing agent is released into one of the inlets, the force exerted by the extinguishing agent on the sealing ball is greater than the magnetic force between the sealing ball and the annular magnet in the first operating state.

[0018] According to the T-type one-way valve of the present invention, because the magnetic force is greater than the maximum maneuvering inertial force, the sealing ball can always be stably attracted and fixed even under extreme overload conditions such as aircraft dives, turns, and climbs. In addition, the extinguishing agent release thrust can overcome the magnetic force, and after the extinguishing command is triggered, the sealing ball can reliably switch direction to seal the other inlet, ensuring the injection pressure of the extinguishing agent.

[0019] To achieve the aforementioned objectives of the present invention, the present invention also provides an engine fire extinguishing system, comprising: two engine fire extinguishing cylinders, each engine fire extinguishing cylinder having two fire extinguishing cylinder outlets; two T-type one-way valves as described above; a fire extinguisher pipeline, wherein the fire extinguisher pipeline connects the two inlets of one of the T-type one-way valves to one fire extinguishing cylinder outlet of one engine fire extinguishing cylinder and one fire extinguishing cylinder outlet of the other engine fire extinguishing cylinder, respectively, and connects the two inlets of the other T-type one-way valve to another fire extinguishing cylinder outlet of one engine fire extinguishing cylinder and another fire extinguishing cylinder outlet of the other engine fire extinguishing cylinder, respectively; and a fire extinguishing agent nozzle, wherein the fire extinguishing agent nozzle is connected to the outlets of the two T-type one-way valves respectively.

[0020] According to the engine fire extinguishing system of the present invention, two T-type one-way valves and two engine fire extinguishing bottles are arranged in a cross pattern through the fire extinguisher pipeline, which can realize the functional requirement of two engine fire extinguishing bottles to extinguish the fire on one side of the engine twice. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the T-type check valve according to an embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional schematic diagram of the T-type check valve according to an embodiment of the present invention when the sealing ball is in the first operating state.

[0023] Figure 3 This is a cross-sectional schematic diagram of the T-type check valve according to an embodiment of the present invention when the sealing ball is in the second operating state.

[0024] Figure 4 This is a schematic diagram of the engine fire extinguishing system according to an embodiment of the present invention.

[0025] (Symbol Explanation)

[0026] 10 T-type check valve

[0027] 1 Valve body

[0028] 11. Enlarged inner diameter section

[0029] 12 Integrated valve seat

[0030] 2. Sealed ball

[0031] 3 Valve seat

[0032] 31 Large diameter part

[0033] 32 Small diameter section

[0034] 4. Ring magnet

[0035] Entrances 5 and 6

[0036] 7 Exports

[0037] 100 Engine Fire Suppression System

[0038] 20 engine fire extinguishers

[0039] 201 Fire Extinguisher Bottle Exit

[0040] 30 Fire extinguishing pipeline

[0041] 40 Fire extinguishing agent nozzle Detailed Implementation

[0042] Various embodiments of the invention will now be described in detail, examples of which are shown in the accompanying drawings and described below. Although the invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the invention to those exemplary embodiments. Rather, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of the invention as defined by the appended claims.

[0043] Below, in conjunction with Figures 1 to 4 The T-type check valve 10 and the engine fire extinguishing system 100 including the T-type check valve 10 according to an embodiment of the present invention will be described.

[0044] Figure 1 This is a three-dimensional schematic diagram of the T-type check valve 10 according to an embodiment of the present invention. Figure 2This is a cross-sectional schematic diagram of the T-type check valve 10 according to an embodiment of the present invention when the sealing ball 2 is in the first operating state. Figure 3 This is a cross-sectional schematic diagram of the T-type check valve 10 according to an embodiment of the present invention when the sealing ball 2 is in the second operating state. Figure 4 This is a schematic diagram of the structure of the engine fire extinguishing system 100 according to an embodiment of the present invention.

[0045] (Structure of the engine fire extinguishing system 100 according to an embodiment of the present invention)

[0046] The following mainly refers to Figure 4 The structure of the engine fire extinguishing system 100 according to an embodiment of the present invention will be described.

[0047] The engine fire suppression system 100 of this invention, for example, is used for extinguishing fires in aircraft engines, and includes two engine fire extinguishing cylinders 20 and two T-type one-way valves 10. Each engine fire extinguishing cylinder 20 has two fire extinguishing cylinder outlets 201, and each fire extinguishing cylinder outlet 201 is connected to a fire extinguisher pipeline 30. The fire extinguisher pipeline 30 connects the two inlets 5 and 6 of a T-type one-way valve 10 to one fire extinguishing cylinder outlet 201 of each of the two engine fire extinguishing cylinders 20. A fire extinguishing agent nozzle 40 is connected to the outlet 7 of the T-type one-way valve 10.

[0048] (Structure of the T-type check valve 10 according to an embodiment of the present invention)

[0049] The following mainly refers to Figures 1 to 3 The structure of the T-type check valve 10 according to an embodiment of the present invention will be described.

[0050] The T-type check valve 10 of this invention, as described above, is, for example, one of the components of an aircraft engine fire suppression system 100. It includes: a valve body 1, which is formed in a T-shape; a valve seat 3, which is installed at one end (right end) of the valve body 1 in the lateral direction; and a sealing ball 2, which is slidably housed inside the valve body 1 in the lateral direction. The T-type check valve 10 has two lateral inlets 5 and 6 and one longitudinal outlet 7. At one inlet 6 of the valve body 1, an annular magnet 4 is provided between the valve body 1 and the valve seat 3. The sealing ball 2 can switch between a first operating state and a second operating state. In the first operating state, the sealing ball 2 and the annular magnet 4 form a magnetic assembly, so that the position of the sealing ball 2 is fixed and cannot slide. In the second operating state, the sealing ball 2 slides away from the annular magnet 4 and forms a sealing pair with the valve body 1 to seal the other inlet 5 of the valve body 1.

[0051] The valve body 1 is made of a non-magnetized metal, such as austenitic stainless steel or aluminum alloy; the sealing ball 2 is made of a magnetized metal, such as iron-nickel alloy, carbon steel, or martensitic stainless steel; and the valve seat 3 is made of a non-magnetized metal.

[0052] In an embodiment of the present invention, the valve seat 3 is formed as a stepped cylindrical shape having a large diameter portion 31 and a small diameter portion 32. The small diameter portion 32 is inserted into the interior of the valve body 1, and the annular magnet 4 is disposed between the small diameter portion 32 and the valve body 1.

[0053] Specifically, an inner diameter expansion portion 11 is formed at the end of the valve body 1 to increase the inner diameter, and an annular magnet 4 is disposed between the inner diameter expansion portion 11 and the small diameter portion 32 at the transition between the large diameter portion 31 and the small diameter portion 32.

[0054] In addition, an integral valve seat 12 is integrally formed at the other lateral end of the valve body 1. The specific structure of the integral valve seat 12 is similar to that of the valve seat 3.

[0055] That is, the T-type one-way valve 10 of the present invention consists of a valve body 1, a valve seat 3, a sealing ball 2, and an annular magnet 4, and has two inlets (fire extinguishing agent inlets) 5 and 6 and one outlet (fire extinguishing agent outlet) 7. The two inlets 5 and 6 of the T-type one-way valve 10 are respectively connected to two engine fire extinguishing bottles 20.

[0056] In the first operating state, the sealing ball 2 and the annular magnet 4 form a magnetic assembly. Due to the magnetic force between the sealing ball 2 and the annular magnet 4, the sealing ball 2 is always in a state of... Figure 2 The position shown will not reciprocate within valve body 1 depending on the aircraft's attitude and acceleration.

[0057] At this time, the magnetic force between the sealing ball 2 and the annular magnet 4 is greater than the inertial force generated by the maximum acceleration of the aircraft on the sealing ball 2. The sealing ball 2 will not move freely in the valve body 1 with the aircraft's attitude and acceleration, thus avoiding unnecessary wear.

[0058] In the second action state, the main features are as follows: Figure 3 , Figure 4 As shown, the extinguishing agent is released from the engine fire extinguishing bottle 20, flows through the fire extinguishing pipeline 30 and enters the T-type one-way valve 10. At this time, the force of the extinguishing agent on the sealing ball 2 is greater than the magnetic force between the sealing ball 2 and the annular magnet 4. The extinguishing agent pushes the sealing ball 2 to the other side of the valve body 1, and the extinguishing agent flows out from the outlet 7 of the T-type one-way valve 10 and enters the fire zone through the extinguishing agent nozzle 40. Adding the annular magnet 4 will not affect the engine's fire extinguishing function and performance.

[0059] As can be seen from the above, in order to achieve the expected function of the T-type one-way valve 10, the magnetic force between the sealing ball 2 and the annular magnet 4 is greater than the inertial force generated on the sealing ball 2 under the maximum acceleration of the aircraft, and less than the force generated on the sealing ball 2 by the extinguishing agent when the extinguishing agent is released.

[0060] The T-type check valve 10 of this invention is provided with an annular magnet 4. The annular magnet 4 can prevent the sealing ball 2 from reciprocating within the valve body 1 with the aircraft attitude and acceleration in the first operating state, thereby avoiding unnecessary wear and improving the service life of the T-type check valve 10.

[0061] (Operation of the T-type one-way valve 10 and the engine fire suppression system 100 including it according to the embodiments of the present invention)

[0062] Below, we will mainly refer to Figures 2 to 4 The operation of the T-type check valve 10 and the engine fire suppression system 100 including the T-type check valve 10 according to an embodiment of the present invention will be described.

[0063] When a fire breaks out in one of the engines and a fire extinguishing operation is initiated, the fire extinguishing agent from one engine fire extinguishing cylinder 20 is released first. The extinguishing agent then enters one inlet 5 of the T-type check valve 10 through the fire extinguishing pipeline 30. Figure 2 As shown, at this time, the sealing ball 2 and the valve seat 3 form a sealing pair to prevent the extinguishing agent from leaking from the other inlet 6. The extinguishing agent flows out from the outlet 7 of the T-type check valve 10 and enters the fire zone through the extinguishing agent nozzle 40.

[0064] If the fire is not extinguished after releasing one engine fire extinguishing bottle 20, then release another engine fire extinguishing bottle 20. The extinguishing agent enters through the other inlet 6 of the T-type one-way valve 10, pushing the sealing ball 2 to break free from the magnetic force of the annular magnet 4 and slide to the other side of the valve body 1, forming a sealing pair with the valve body 1. The extinguishing agent flows out from the outlet 7 of the T-type one-way valve 10 and re-enters the fire zone.

[0065] (Variation example)

[0066] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments.

[0067] (1) In this embodiment, the T-type one-way valve 10 of the present invention is described as being used in the engine fire extinguishing system of an aircraft, but it is not limited thereto. The T-type one-way valve 10 of the present invention can also be used in various airborne fire-fighting pipelines, marine fire-fighting pipelines, vehicle-mounted sprinkler pipelines, and fire-fighting pipelines for energy storage equipment.

[0068] (2) In this embodiment, an integral valve seat 12 is integrally formed at the other end of the valve body 1 in the lateral direction. However, the valve seat can also be formed separately from the valve body 1, just like at one end of the valve body 1 in the lateral direction.

[0069] (Features and technical effects of the T-type one-way valve 10 and the engine fire extinguishing system 100 including the present invention)

[0070] The T-type check valve 10 of the present invention includes: a valve body 1, which is formed in a T-shape; a valve seat 3, which is installed at one end of the valve body 1 in a transverse direction; and a sealing ball 2, which is slidably housed inside the valve body 1 in a transverse direction. The T-type check valve 10 has two transverse inlets 5 and 6 and one longitudinal outlet 7. At one inlet 6 of the valve body 1, an annular magnet 4 is provided between the valve body 1 and the valve seat 3. The sealing ball 2 can switch between a first operating state and a second operating state. In the first operating state, the sealing ball 2 and the annular magnet 4 form a magnetic assembly, so that the position of the sealing ball 2 is fixed and cannot slide. In the second operating state, the sealing ball 2 slides away from the annular magnet 4 and forms a sealing pair with the valve body 1 to seal the other inlet 5 of the valve body 1.

[0071] According to the T-type check valve 10 of the present invention, since an annular magnet 4 is provided between the valve body 1 and the valve seat 3, the sealing ball 2 can switch between a first operating state and a second operating state. In the first operating state, the sealing ball 2 and the annular magnet 4 form a magnetic component, so that the position of the sealing ball 2 is fixed and cannot slide. Therefore, in the first operating state, the sealing ball 2 is attracted to one side of the valve seat 3 and will not roll freely under the action of external force, which can reduce the wear of the sealing pair formed by the sealing ball 2, the valve body 1, and the valve seat 3, and effectively improve the service life.

[0072] In addition, the valve seat 3 is formed as a stepped cylindrical shape with a large diameter portion 31 and a small diameter portion 32. The small diameter portion 32 is inserted into the interior of the valve body 1, and the annular magnet 4 is disposed between the small diameter portion 32 and the valve body 1.

[0073] According to the T-type check valve 10 of the present invention, the annular magnet 4 is sandwiched between the small diameter portion 32 and the valve body 1, and the large diameter portion 31 of the valve seat 3 can axially limit the annular magnet 4, so that the annular magnet 4 will not move axially and fall off.

[0074] In addition, an inner diameter expansion portion 11 is formed at the end of the valve body 1 to expand the inner diameter, and an annular magnet 4 is disposed between the inner diameter expansion portion 11 and the small diameter portion 32 at the transition portion between the large diameter portion 31 and the small diameter portion 32.

[0075] According to the T-type check valve 10 of the present invention, the inner diameter enlargement portion 11 of the valve body 1 and the transition step of the valve seat 3 form a closed annular receiving groove, which realizes radial and axial bidirectional limiting of the annular magnet 4, so that the annular magnet 4 has no radial displacement and no risk of falling out.

[0076] In addition, an integral valve seat 12 is integrally formed at the other end of the valve body 1 in the lateral direction.

[0077] According to the T-type check valve 10 of the present invention, the valve seat on one side and the valve body 1 are integrally formed, thereby reducing independent parts, eliminating the need for press-fitting and welding assembly processes, reducing assembly errors, and improving the overall structural strength.

[0078] In addition, the valve body 1 is made of a non-magnetized metal, the sealing ball 2 is made of a magnetized metal, and the valve seat 3 is made of a non-magnetized metal.

[0079] According to the present invention, the T-type check valve 10 has a valve body 1 and a valve seat 3 made of non-magnetizable metal, which can isolate the magnetic field generated by the annular magnet 4, and a sealing ball 2 made of magnetizable metal, which can form a stable magnetic adsorption fit with the annular magnet 4.

[0080] In addition, the T-type one-way valve 10 is used in the aircraft's engine fire suppression system 100.

[0081] According to the T-type check valve 10 of the present invention, during normal taxiing and flight of the aircraft, the sealing ball 2 is adsorbed on one side of the valve seat 3 and does not roll freely with the aircraft attitude and acceleration, which can reduce the wear of the sealing pair and effectively improve the service life.

[0082] In addition, in the first operating state, the magnetic force between the sealing ball 2 and the annular magnet 4 is greater than the inertial force generated on the sealing ball 2 under the maximum acceleration of the aircraft. In the second operating state, when the extinguishing agent is released into an inlet 6, the force exerted by the extinguishing agent on the sealing ball 2 is greater than the magnetic force between the sealing ball 2 and the annular magnet 4 in the first operating state.

[0083] According to the T-type one-way valve 10 of the present invention, since the magnetic force is greater than the maximum maneuvering inertial force, the sealing ball 2 can always be stably attracted and fixed even under extreme overload conditions such as aircraft dive, turn, and climb. In addition, the extinguishing agent release thrust can overcome the magnetic force, and after the extinguishing command is triggered, the sealing ball 2 can reliably switch direction to seal the other inlet 5, ensuring the injection pressure of the extinguishing agent.

[0084] The engine fire extinguishing system 100 of the present invention includes: two engine fire extinguishing bottles 20, each engine fire extinguishing bottle 20 having two fire extinguishing bottle outlets 201; two T-type one-way valves 10 as described above; a fire extinguisher pipeline 30, which connects the two inlets 5 and 6 of one T-type one-way valve 10 to one fire extinguishing bottle outlet 201 of one engine fire extinguishing bottle 20 and one fire extinguishing bottle outlet 201 of the other engine fire extinguishing bottle 20, and connects the two inlets 5 and 6 of the other T-type one-way valve 10 to the other fire extinguishing bottle outlet 201 of one engine fire extinguishing bottle 20 and the other fire extinguishing bottle outlet 201 of the other engine fire extinguishing bottle 20; and a fire extinguishing agent nozzle 40, which is connected to the outlets 7 of the two T-type one-way valves 10 respectively.

[0085] According to the engine fire extinguishing system 100 of the present invention, two T-type one-way valves 10 and two engine fire extinguishing bottles 20 are arranged in a cross pattern through fire extinguisher pipelines 30, which can realize the functional requirement of two engine fire extinguishing bottles 20 extinguishing the fire twice on one side of the engine.

[0086] While the structure and working principle of the present invention have been described above with reference to preferred embodiments, those skilled in the art should recognize that the above examples are merely illustrative and should not be construed as limiting the invention. Therefore, modifications and variations can be made to the invention within the spirit and scope of the claims, and all such modifications and variations will fall within the scope claimed by the claims.

Claims

1. A T-type check valve, comprising: Valve body, the valve body being formed in a T-shape; Valve seat, the valve seat being mounted at one lateral end of the valve body; and A sealing ball, which can be slidably housed inside the valve body in a laterally oriented manner. The T-type check valve has two transverse inlets and one longitudinal outlet. Its features are, At one of the inlets of the valve body, an annular magnet is disposed between the valve body and the valve seat. The sealing ball can switch between a first operating state and a second operating state. In the first operating state, the sealing ball and the annular magnet form a magnetic assembly, fixing the position of the sealing ball and preventing it from sliding. In the second operating state, the sealing ball slides away from the annular magnet to form a sealing pair with the valve body, thereby sealing the other inlet of the valve body.

2. The T-type check valve according to claim 1, characterized in that, The valve seat is formed as a stepped cylindrical shape with a large diameter portion and a small diameter portion. The smaller diameter portion is inserted into the interior of the valve body. The annular magnet is disposed between the small diameter portion and the valve body.

3. The T-type check valve according to claim 2, characterized in that, An inner diameter enlargement portion is formed at the end of the valve body to increase the inner diameter. The annular magnet is disposed at the transition between the large diameter portion and the small diameter portion, between the inner diameter enlargement portion and the small diameter portion.

4. The T-type check valve according to claim 1, characterized in that, An integral valve seat is integrally formed at the other lateral end of the valve body.

5. The T-type check valve according to claim 1, characterized in that, The valve body is made of a non-magnetizable metal. The sealing ball is made of a magnetizable metal. The valve seat is made of a non-magnetized metal.

6. The T-type check valve according to any one of claims 1 to 5, characterized in that, The T-type check valve is used in the aircraft's engine fire suppression system.

7. The T-type check valve according to claim 6, characterized in that, In the first operating state, the magnetic force between the sealing ball and the annular magnet is greater than the inertial force generated on the sealing ball under the maximum acceleration of the aircraft. In the second operating state, when the extinguishing agent is released into one of the inlets, the force exerted by the extinguishing agent on the sealing ball is greater than the magnetic force between the sealing ball and the annular magnet in the first operating state.

8. An engine fire extinguishing system, characterized in that, include: Two engine fire extinguishing bottles, each of which has two fire extinguishing bottle outlets; The T-type check valve according to any one of claims 1 to 7; A fire extinguisher pipeline, wherein the two inlets of one of the T-type check valves are respectively connected to one outlet of one engine fire extinguisher bottle and one outlet of another engine fire extinguisher bottle, and the two inlets of another T-type check valve are respectively connected to the other outlet of one engine fire extinguisher bottle and the other outlet of another engine fire extinguisher bottle; and The extinguishing agent nozzle is connected to the outlet of each of the two T-type one-way valves.

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