An aviation fuel valve

Abstract

The present application provides an aviation fuel valve, comprising a valve body, which is internally provided with an oil inlet channel, a main oil path and a starting oil path; the main oil path comprises a fuel introduction channel, an adjusting cavity and a fuel hole, the front end of the fuel introduction channel is communicated with the oil inlet channel, the rear end of the fuel introduction channel is connected to the front end of the adjusting cavity, the front end of the fuel hole is arranged on the inner circumferential wall of the middle part of the adjusting cavity, and the adjusting cavity is internally provided with a first piston valve core; the valve body is further internally provided with a control cavity, the control cavity is internally provided with a second piston valve core, the second piston valve core is connected with the first piston valve core through a connecting shaft, the control cavity is divided into a front cavity and a rear cavity, the front cavity is arranged in communication with the air outlet end of the air compressor of the aircraft engine, and the rear cavity is arranged in communication with the atmosphere; when the first piston valve core is located at the front end of the adjusting cavity, the fuel hole is closed, and when the first piston valve core moves from front to back, the fuel hole is gradually opened. The valve can avoid the main oil path from being filled with oil too fast, prevent the pressure of the starting oil path from suddenly dropping, and improve the starting reliability of the aircraft engine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel valve, in particular to an aviation fuel valve. BACKGROUND

[0002] The modern small and medium-sized aero-engine fuel system uses an electric fuel pump and a double oil path scheme, that is, an electric fuel pump is used to control fuel supply, a starting oil path is connected with a centrifugal starting nozzle, the nozzle atomizes fuel, and a high-energy igniter ignites the fuel, so that the engine starts, and the engine is supplied with fuel by a venturi nozzle connected with a main oil path. At present, due to the fact that the flow resistance of the main oil path is much smaller than that of the starting oil path, the fuel in the main oil path flows too fast, and at the moment of switching between the starting oil path and the main oil path, the pressure of the starting oil path drops suddenly, the fuel supply is reduced, and the engine is prone to fail to start. SUMMARY

[0003] The technical problem to be solved by the present application is that the fuel in the main oil path flows too fast, the pressure of the starting oil path drops suddenly, the fuel supply is reduced, and the engine is prone to fail to start. In order to overcome the defects of the prior art, the present application provides an aviation fuel valve.

[0004] The present application provides an aviation fuel valve, comprising a valve body, an oil inlet channel, a main oil path and a starting oil path are arranged in the valve body, the oil inlet channel is in communication with the main oil path and the starting oil path, a fuel filtering mechanism is arranged in the oil inlet channel, the main oil path is used to be connected with a main fuel system of an airplane, the starting oil path is used to be connected with a starting fuel system of the airplane, and the starting fuel system of the airplane is used to start an engine of the airplane; the main oil path comprises a fuel inlet channel, an adjusting cavity and a fuel hole, a front end of the fuel inlet channel is in communication with the oil inlet channel, a rear end of the fuel inlet channel is connected to a front end of the adjusting cavity, the adjusting cavity is a cylindrical cavity, a front end of the fuel hole is arranged on an inner circumferential wall of a middle part of the adjusting cavity, a rear end of the fuel hole is connected with the main fuel system of the airplane, and a first piston valve core moving along an axial direction is arranged in the adjusting cavity; a control cavity is further arranged in the valve body, a second piston valve core moving is arranged in the control cavity, the second piston valve core is connected with the first piston valve core through a connecting shaft, the second piston valve core seals and divides the control cavity into a front cavity and a rear cavity, the front cavity is arranged in communication with an air outlet end of a compressor of the airplane engine, the pressure of the air outlet end of the compressor of the airplane engine gradually increases with the starting of the airplane engine, and the rear cavity is arranged in communication with the atmosphere; when the first piston valve core is located at the front end of the adjusting cavity, the fuel hole is closed, and when the first piston valve core moves from the front to the rear, the fuel hole is gradually opened.

[0005] Compared with the prior art, the aviation fuel valve has the following advantages: when the first piston valve core is located at the front end of the adjusting cavity, the fuel hole is closed, that is, the fuel hole is disconnected with the fuel introduction channel, and the valve body supplies oil to the aircraft starting fuel system through the starting oil way; when the starting oil way switches the main oil way, the pressure at the gas outlet end of the aircraft engine compressor gradually increases with the starting of the aircraft engine, a pressure difference is formed between the front cavity and the rear cavity, the second piston valve core moves backward, the first piston valve core moves backward through the connecting shaft, the fuel hole is connected with the fuel introduction channel, and the fuel hole is gradually opened, that is, the whole switching main oil way oil supply process is smooth, the main oil way is prevented from being filled with oil too fast, the pressure of the starting oil way is prevented from suddenly dropping, and the starting reliability of the aircraft engine is improved; meanwhile, the fuel filtering mechanism is arranged in the oil inlet channel, fuel flowing into the main oil way and the starting oil way is filtered, the fuel is clean, and the starting and operation of the aircraft engine are facilitated.

[0006] In a possible implementation, a guide rod is arranged on the first piston valve core, and a guide hole for the axial movement of the guide rod is arranged on the valve body.

[0007] Compared with the prior art, the above technical solution can guide the axial movement of the first piston valve core and improve the movement reliability of the first piston valve core.

[0008] In a possible implementation, a first spring is arranged in the adjusting cavity, a front end of the first spring is connected with the first piston valve core, a rear end of the first spring is connected with the valve body, and the first spring is sleeved on the guide rod to drive the first piston valve core to move forward.

[0009] Compared with the prior art, the above technical solution can apply a certain extrusion force to the first piston valve core at the front end of the adjusting valve to delay the backward movement of the first piston valve core, prevent the main oil way from being filled with oil too fast, and facilitate the oil filling of the starting oil way.

[0010] In a possible implementation, a first ring groove is arranged on the outer peripheral wall of the second piston valve core, a first sealing ring is arranged in the first ring groove, and the first sealing ring is sealingly attached to the inner peripheral wall of the control cavity.

[0011] Compared with the prior art, the above technical solution can seal and isolate the front cavity and the rear cavity, and improve the movement reliability of the second piston valve core.

[0012] In a possible implementation, an installation cavity is arranged in the valve body, a detachable valve sleeve is arranged in the installation cavity, the adjusting cavity and the control cavity are coaxially and spacedly arranged in the valve sleeve, the connecting shaft is arranged in the valve sleeve, a front end of the connecting shaft is located in the control cavity, a rear end of the connecting shaft is located in the adjusting cavity, and a sealing ring is arranged between the valve sleeve and the connecting shaft.

[0013] Compared with the prior art, the valve can be conveniently assembled, the structural connection is stable, the use is reliable, and the sealing between the adjusting cavity and the control cavity is improved.

[0014] In a possible implementation, the fuel filter mechanism comprises an oil filter block, a fuel filter element and a second spring, the oil filter block is fixed in the oil inlet channel and arranged close to the front end of the oil inlet channel, the oil filter block has a ring structure and the outer peripheral wall of the oil filter block is sealingly fitted with the inner peripheral wall of the oil inlet channel, a second sealing ring is arranged on the rear end surface of the oil filter block, the fuel filter element is arranged in the oil inlet channel in an axial direction, an oil passing gap is arranged between the fuel filter element and the inner peripheral wall of the oil inlet channel, the rear end of the second spring is connected with the valve body, the front end of the second spring is connected with the fuel filter element, and the second spring is used to move the fuel filter element towards the oil filter block, when the fuel filter element presses the second sealing ring of the oil filter block, the fuel filter element filters the fuel in the oil inlet channel, and when the fuel filter element is away from the oil filter block, the fuel in the oil inlet channel flows out from the rear end of the oil channel through the oil passing gap.

[0015] Compared with the prior art, the fuel filter mechanism can filter the fuel in the oil inlet channel, and when the fuel filter element is blocked, oil can pass through the oil passing gap to avoid oil passage blockage and ensure normal operation of the main oil passage and the starting oil passage.

[0016] In a possible implementation, a second ring groove is arranged on the rear end surface of the oil filter block, and the second sealing ring is arranged in the second ring groove; the outer peripheral wall of the oil filter block is provided with a third ring groove, and a third sealing ring is arranged in the third ring groove, and the third sealing ring is sealingly fitted with the inner peripheral wall of the oil inlet channel.

[0017] Compared with the prior art, the sealing reliability of the oil filter block is improved.

[0018] In a possible implementation, the fuel filter element comprises a support ring and a filter screen, the front end of the support ring is used to abut against the second sealing ring, and the rear end of the support ring is detachably connected with the filter screen; the outer peripheral diameter of the support ring is smaller than the inner peripheral diameter of the oil inlet channel, and the outer peripheral diameter of the support ring is greater than the outer peripheral diameter of the second sealing ring.

[0019] Compared with the prior art, the filter screen can be stably supported, the filter screen can be conveniently disassembled and replaced, the oil can smoothly pass through the oil passing gap, and the use stability of the first sealing ring is improved.

[0020] In a possible implementation, the filter screen has a conical structure, and the large end of the filter screen is inserted into the support ring.

[0021] Compared with the prior art, the above technical scheme can increase the contact area with fuel and improve the filtering effect.

[0022] In a possible implementation, the front end of the oil inlet channel is provided with a snap spring abutting against the oil filter pressing block, and the rear end of the oil inlet channel is provided with an annular step abutting against the second spring.

[0023] Compared with the prior art, the above technical scheme can improve the setting stability of the oil filter pressing block and the second spring. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the application;

[0025] Figure 2 is a sectional view of the application Figure One ;

[0026] Figure 3 is an enlarged view of A of the application; Figure 2

[0027] Figure 4 is a sectional view of the application Figure Two ;

[0028] Figure 5 is a schematic diagram of part of the structure of the application;

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1, valve body; 11, guide hole; 12, mounting cavity; 13, valve sleeve; 14, sealing ring; 2, oil inlet channel; 21, snap spring; 22, annular step; 3, main oil way; 31, fuel introduction channel; 32, adjusting cavity; 33, fuel hole; 4, starting oil way; 5, fuel filtering mechanism; 51, oil filter pressing block; 511, second annular groove; 512, third annular groove; 52, fuel filter element; 521, support ring; 522, filter screen; 53, second spring; 54, second sealing ring; 55, oil passing gap; 56, third sealing ring; 6, first piston valve core; 61, guide rod; 7, control cavity; 71, front cavity; 72, rear cavity; 8, second piston valve core; 81, first annular groove; 82, first sealing ring; 9, connecting shaft; 10, first spring. DETAILED DESCRIPTION

[0031] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the application examples, and are not intended to limit the protection scope of the application examples. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0032] ​In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "connected", "connected to", "connection" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0033] In the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0035] Reference is made to Figures 1 to 5The embodiment of the present application discloses an aviation fuel valve, which comprises a valve body 1, an oil inlet channel 2, a main oil path 3 and a starting oil path 4 are arranged in the valve body 1, the oil inlet channel 2 is communicated with the main oil path 3 and the starting oil path 4, a fuel filtering mechanism 5 is arranged in the oil inlet channel 2, the main oil path 3 is used for being connected with an aircraft main fuel system, the starting oil path 4 is used for being connected with an aircraft starting fuel system, and the aircraft starting fuel system starts an aircraft engine; the main oil path 3 comprises a fuel introduction channel 31, an adjusting cavity 32 and a fuel hole 33, the front end of the fuel introduction channel 31 is communicated with the oil inlet channel 2, the rear end of the fuel introduction channel 31 is connected to the front end of the adjusting cavity 32, the adjusting cavity 32 extends along an axial direction and is in a cylindrical cavity shape, the front end of the fuel hole 33 is arranged on an inner circumferential wall of the middle part of the adjusting cavity 32, the rear end of the fuel hole 33 is connected with the aircraft main fuel system, a first piston valve core 6 which moves along the axial direction is arranged in the adjusting cavity 32, and the first piston valve core 6 is used for opening and closing the fuel hole 33; a control cavity 7 is further arranged in the valve body 1, a second piston valve core 8 which moves is arranged in the control cavity 7, the second piston valve core 8 is connected with the first piston valve core 6 through a connecting shaft 9, the second piston valve core 8 divides the control cavity 7 into a front cavity 71 and a rear cavity 72, the front cavity 71 is arranged in communication with the gas outlet end of an aircraft engine compressor, the pressure of the gas outlet end of the aircraft engine compressor gradually increases along with the starting of the aircraft engine, and the rear cavity 72 is arranged in communication with the atmosphere; when the first piston valve core 6 is located at the front end of the adjusting cavity 32, the fuel hole 33 is closed, that is, the first piston valve core 6 moves between the fuel introduction channel 31 and the fuel hole 33, when the first piston valve core 6 moves from front to back, the fuel hole 33 is gradually opened, that is, the fuel introduction channel 31 and the fuel hole 33 are both located on the front side of the first piston valve core 6. The aircraft main fuel system, the aircraft starting fuel system, the aircraft engine and the aircraft engine compressor are all prior arts.

[0036] As known from the above, when the first piston valve core 6 is located at the front end of the adjusting cavity 32, the fuel hole 33 is closed, that is, the fuel hole 33 is disconnected with the fuel introduction channel 31, and the valve body 1 supplies oil to the aircraft starting fuel system through the starting oil path 4; when the starting oil path 4 switches the main oil path 3, the pressure of the gas outlet end of the aircraft engine compressor gradually increases along with the starting of the aircraft engine, a pressure difference is formed between the front cavity 71 and the rear cavity 72, the second piston valve core 8 moves backward, the second piston valve core 8 moves the first piston valve core 6 backward through the connecting shaft 9, the fuel hole 33 is communicated with the fuel introduction channel 31, and the fuel hole 33 is gradually opened, that is, the whole process of switching the main oil path 3 to supply oil is smooth, the oil inlet of the main oil path 3 is prevented from being too fast, the pressure of the starting oil path 4 is prevented from being suddenly reduced, and the starting reliability of the aircraft engine is improved; meanwhile, the fuel filtering mechanism 5 is arranged in the oil inlet channel 2, so that the fuel flowing into the main oil path 3 and the starting oil path 4 is filtered, the fuel is clean, and the starting and operation of the aircraft engine are facilitated.

[0037] In the embodiment, the first piston valve core 6 is provided with a guide rod 61, and the valve body 1 is provided with a guide hole 11 for the axial movement of the guide rod 61, so that the first piston valve core 6 has axial movement guidance, and the movement reliability of the first piston valve core 6 is improved.

[0038] In the embodiment, the adjusting cavity 32 is provided with a first spring 10, the front end of the first spring 10 is connected with the first piston valve core 6, the rear end of the first spring 10 is connected with the valve body 1, and the first spring 10 is sleeved on the guide rod 61 for driving the first piston valve core 6 to move forward, so that the first piston valve core 6 is subjected to a certain extrusion force at the front end of the adjusting valve, the rearward movement of the first piston valve core 6 is delayed, the oil inlet of the main oil way 3 is prevented from being too fast, and the oil inlet of the starting oil way 4 is facilitated.

[0039] In the embodiment, the outer peripheral wall of the second piston valve core 8 is provided with a first ring groove 81, and the first ring groove 81 is provided with a first sealing ring 82, which is sealingly attached to the inner peripheral wall of the control cavity 7, so that the front cavity 71 and the rear cavity 72 are sealingly isolated, and the movement reliability of the second piston valve core 8 is improved.

[0040] In the embodiment, the valve body 1 is provided with a mounting cavity 12, the mounting cavity 12 is provided with a detachable valve sleeve 13, the valve sleeve 13 is provided with the coaxial and spaced adjusting cavity 32 and control cavity 7, the connecting shaft 9 is arranged in the valve sleeve 13, the front end of the connecting shaft 9 is located in the control cavity 7, the rear end of the connecting shaft 9 is located in the adjusting cavity 32, and the sealing ring 14 is arranged between the valve sleeve 13 and the connecting shaft 9, so that the assembly of the valve body is facilitated, the structure connection is stable and reliable, the use is reliable, and the separation sealing property between the adjusting cavity 32 and the control cavity 7 is improved.

[0041] In the embodiment, the fuel filter mechanism 5 comprises an oil filter block 51, a fuel filter element 52 and a second spring 53. The oil filter block 51 is fixed in the oil inlet channel 2 and arranged close to the front end of the oil inlet channel 2. The oil filter block 51 has a ring structure and the outer peripheral wall of the oil filter block 51 is sealingly fitted with the inner peripheral wall of the oil inlet channel 2. The rear end surface of the oil filter block 51 is provided with a second sealing ring 54. The fuel filter element 52 is arranged in the oil inlet channel 2 in an axial direction. An oil passing gap 55 is arranged between the fuel filter element 52 and the inner peripheral wall of the oil inlet channel 2. The rear end of the second spring 53 is connected with the valve body 1 and the front end of the second spring 53 is connected with the fuel filter element 52. The second spring 53 is used to move the fuel filter element 52 towards the oil filter block 51. When the fuel filter element 52 presses the second sealing ring 54 of the oil filter block 51, the fuel filter element 52 filters the fuel in the oil inlet channel 2. When the fuel filter element 52 is away from the oil filter block 51, the fuel in the oil inlet channel 2 flows out from the rear end of the oil channel through the oil passing gap 55. Thus, the fuel in the oil inlet channel 2 can be filtered by the filter mechanism. When the fuel filter element 52 is blocked, the oil can pass through the oil passing gap 55, thereby avoiding the blockage of the oil path and ensuring the normal operation of the main oil path 3 and the starting oil path 4.

[0042] In the embodiment, the rear end surface of the oil filter block 51 is provided with a second ring groove 511 and the second sealing ring 54 is arranged in the second ring groove 511. The outer peripheral wall of the oil filter block 51 is provided with a third ring groove 512 and the third ring groove 512 is provided with a third sealing ring 56. The third sealing ring 56 is sealingly fitted with the inner peripheral wall of the oil inlet channel 2. Thus, the sealing reliability of the oil filter block 51 can be improved.

[0043] In the embodiment, the fuel filter element 52 comprises a support ring 521 and a filter screen 522. The front end of the support ring 521 is used to abut against the second sealing ring 54 and the rear end of the support ring 521 is detachably connected with the filter screen 522. The outer peripheral diameter of the support ring 521 is smaller than the inner peripheral diameter of the oil inlet channel 2 and the outer peripheral diameter of the support ring 521 is greater than the outer peripheral diameter of the second sealing ring 54. Thus, the filter screen 522 can be stably supported, the filter screen 522 can be conveniently disassembled and replaced, the oil can smoothly pass through the oil passing gap 55 and the use stability of the first sealing ring 82 can be improved.

[0044] In the embodiment, the filter screen 522 has a conical structure and the large end of the filter screen 522 is inserted into the support ring 521. Thus, the contact area with the fuel can be increased and the filtering effect can be improved.

[0045] In the embodiment, the front end of the oil inlet channel 2 is provided with a snap spring 21 abutting against the oil filter pressing block 51, and the rear end of the oil inlet channel 2 is provided with an annular step 22 abutting against the second spring 53, so that the setting stability of the oil filter pressing block 51 and the second spring 53 can be improved.

[0046] In the embodiment, the starting oil passage 4 of the aviation fuel valve is in a running state: the first spring 10 drives the first piston valve core 6 to move forward, and the first piston valve core 6 is pressed at the front end of the adjusting cavity 32, at this time, the fuel hole 33 is disconnected with the fuel introduction channel 31, that is, the valve body 1 supplies oil to the starting fuel system of the airplane through the starting oil passage 4.

[0047] In the embodiment, the main oil passage 3 of the aviation fuel valve is in a switching running state: the pressure at the gas outlet end of the compressor of the airplane engine gradually increases with the starting of the airplane engine, a pressure difference is formed between the front cavity 71 and the rear cavity 72, and the pressure difference overcomes the extrusion force of the first spring 10, so that the second piston valve core 8 moves backward, the second piston valve core 8 drives the first piston valve core 6 to move backward through the connecting shaft 9, the fuel hole 33 is connected with the fuel introduction channel 31, and the fuel hole 33 is gradually opened, that is, the main oil passage 3 is switched slowly.

[0048] In the description of the embodiments of the present application, it should be noted that in the description of the present application, the terms indicating the direction or position relationship are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0049] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "in the embodiment", "specific examples", or "some examples" means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Furthermore, those skilled in the art can combine and combine the different embodiments or features of the embodiments or examples described in the present specification without contradiction.

[0050] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An aviation fuel valve characterized by, The valve body is provided with an oil inlet channel, a main oil path and a starting oil path, the oil inlet channel is communicated with the main oil path and the starting oil path, the oil inlet channel is provided with a fuel filter mechanism, the main oil path is used for being connected with an aircraft main fuel system, the starting oil path is used for being connected with an aircraft starting fuel system, and the aircraft starting fuel system starts an aircraft engine; The main oil path comprises a fuel introduction channel, an adjusting cavity and a fuel hole, the front end of the fuel introduction channel is communicated with the oil inlet channel, the rear end of the fuel introduction channel is connected to the front end of the adjusting cavity, the adjusting cavity is a cylindrical cavity, the front end of the fuel hole is arranged on the inner circumferential wall of the middle part of the adjusting cavity, the rear end of the fuel hole is connected with the aircraft main fuel system, and the adjusting cavity is provided with a first piston valve core which moves in the axial direction; the valve body is further provided with a control cavity, the control cavity is provided with a second piston valve core which moves, the second piston valve core is connected with the first piston valve core through a connecting shaft, the second piston valve core divides the control cavity into a front cavity and a rear cavity, the front cavity is communicated with the air outlet end of the aircraft engine compressor, the pressure of the air outlet end of the aircraft engine compressor gradually increases with the starting of the aircraft engine, and the rear cavity is communicated with the atmosphere; when the first piston valve core is located at the front end of the adjusting cavity, the fuel hole is closed, and when the first piston valve core moves from front to back, the fuel hole is gradually opened; The first piston valve core is provided with a guide rod, and the valve body is provided with a guide hole for the axial movement of the guide rod; The adjusting cavity is provided with a first spring, the front end of the first spring is connected with the first piston valve core, the rear end of the first spring is connected with the valve body, and the first spring is sleeved on the guide rod and used for driving the first piston valve core to move forward; The fuel filter mechanism comprises an oil filter pressing block, a fuel filter element and a second spring, the oil filter pressing block is fixed in the oil inlet channel and arranged close to the front end of the oil inlet channel, the oil filter pressing block is annular in structure and the outer circumferential wall of the oil filter pressing block is sealingly attached to the inner circumferential wall of the oil inlet channel, the rear end surface of the oil filter pressing block is provided with a second sealing ring, the fuel filter element is arranged in the oil inlet channel and moves in the axial direction, an oil passing gap is formed between the fuel filter element and the inner circumferential wall of the oil inlet channel, the rear end of the second spring is connected with the valve body, and the front end of the second spring is connected with the fuel filter element; the second spring is used for moving the fuel filter element towards the oil filter pressing block, when the fuel filter element presses the second sealing ring of the oil filter pressing block, the fuel filter element filters the fuel in the oil inlet channel, and when the fuel filter element is away from the oil filter pressing block, the fuel in the oil inlet channel flows out from the rear end of the oil channel through the oil passing gap; The fuel filter element comprises a support ring and a filter screen, the front end of the support ring is used for abutting against the second sealing ring, and the rear end of the support ring is detachably connected with the filter screen; the outer circumferential diameter of the support ring is smaller than the inner circumferential diameter of the oil inlet channel, and the outer circumferential diameter of the support ring is greater than the outer circumferential diameter of the second sealing ring; The filter screen is conical in structure, and the large end of the filter screen is inserted into the support ring.

2. The aviation fuel valve of claim 1, wherein, The outer peripheral wall of the second piston valve core is provided with a first ring groove, and the first ring groove is provided with a first sealing ring which is in sealing contact with the inner peripheral wall of the control cavity.

3. The aviation fuel valve of claim 1, wherein, The valve body is provided with a mounting cavity, and the mounting cavity is provided with a detachable valve sleeve. The valve sleeve is provided with the adjusting cavity and the control cavity which are coaxial and spaced apart. The connecting shaft is arranged on the valve sleeve, the front end of the connecting shaft is located in the control cavity, the rear end of the connecting shaft is located in the adjusting cavity, and the sealing ring is arranged between the valve sleeve and the connecting shaft.

4. The aviation fuel valve of claim 1, wherein, The rear end surface of the oil filter pressing block is provided with a second ring groove, and the second sealing ring is arranged in the second ring groove. The outer peripheral wall of the oil filter pressing block is provided with a third ring groove, and the third ring groove is provided with a third sealing ring which is in sealing contact with the inner peripheral wall of the oil inlet channel.

5. The aviation fuel valve of claim 1, wherein, The front end of the oil inlet channel is provided with a snap spring which abuts against the oil filter pressing block. The rear end of the oil inlet channel is provided with an annular step which abuts against the second spring.

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