Discharge valve for an aircraft and associated method

Abstract

The invention relates to a drain valve (1) for an aircraft, comprising: a cylindrical body (2) having an inlet aperture (3) and an outlet aperture (4), a first flap valve (5), a second flap valve (6) arranged inside the body (2), the first and second flap valves (5, 6) being able to move in rotation between a closed position and an open position about a first axis (50) and a second axis (60) respectively, a mechanism (8) for locking the second flap valve (6) in the closed position, comprising: a control lever (9) arranged about a third axis (90), an engagement (10) arranged on the second flap valve (6), and a drive device (11) for rotating the third axis (90), characterized in that the control lever (9) is able to move in rotation about the third axis (90) between an unlocking position, in which the engagement (10) bears against the drive device (11), and a locking position, in which the engagement (10) is engaged in the drive device (11).

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of drain valves for aircraft.

[0002] More particularly, the present invention relates to the technical field of double flap drain valves for aircraft. BACKGROUND

[0003] The prior art is illustrated by documents US-A1-4 690 296 and US-A1-5 237 709.

[0004] Aircraft are generally equipped with tanks to collect waste water during flight. The waste water is then treated after the aircraft has landed.

[0005] To this end, the aircraft is equipped with a drain valve arranged on the fuselage of the aircraft. The waste water flows from the tank through the drain valve, by gravity or suction, and is collected in a waste water collection device.

[0006] The drain valve makes it possible to open and drain the tank during maintenance after the aircraft has landed. The drain valve also makes it possible to close the tank while the aircraft is in operation.

[0007] Typically, the drain valve comprises a cylindrical body having an inlet aperture and an outlet aperture. The inlet aperture is in fluid communication with the tank and the outlet aperture is intended to receive the waste water collection device and possibly a suction device to drain the tank.

[0008] Furthermore, in order to ensure the sealing of the valve, the valve comprises a first flap valve and a second flap valve arranged inside the body of the valve. The flap valves can be moved rotationally between an open position and a closed position. When the flap valves are in the open position, the tank can be drained through the valve, whereas when the flap valves are in the closed position, the valve prevents the waste water from leaving the tank.

[0009] The second flap valve is in direct contact with the waste water and thus forms a first sealing barrier of the valve. The first flap valve reinforces the sealing of the valve and thus provides a second barrier to seal the valve.

[0010] The closing of the second flap valve is therefore particularly important in the design of the drain valve. Indeed, an inadequate closing of the second flap valve can cause the waste water to leak through the second flap valve. This makes it possible for the waste water to accumulate in the space between the first flap valve and the second flap valve. In this case, the simple opening of the first flap valve causes the waste water to leak through the valve before the water collection device and possibly the suction device can be in place.

[0011] To this end, the document US-A-5 246 131 proposes a drain valve for an aircraft comprising a cylindrical body, a first and a second flap valve arranged in the cylindrical body and a mechanism for locking the second flap valve in the closed position. The mechanism for locking the second flap valve comprises an engagement arranged on the second flap valve and a device for rotating a rod mounted about an axis. In the closed position of the flap valve, the engagement engages the driving device and locks the second flap valve. When the flap valve is open, the rod is driven to rotate to release the engagement.

[0012] Such a locking mechanism does not provide complete satisfaction. This is because deposits from the waste water can accumulate and interfere with the mechanism for locking the second flap valve. In this case, the operator has no way of ensuring that the engagement is correctly engaged in the driving system and has no way of ensuring that the second flap valve is therefore correctly locked. A failure of the mechanism for locking the second flap valve cannot therefore be detected in such a valve.

[0013] There is therefore a need to provide a drain valve with a reliable mechanism for locking the second flap valve. SUMMARY

[0014] To this end, the present invention proposes a drain valve for an aircraft comprising:

[0015] a cylindrical body having an inlet aperture and an outlet aperture,

[0016] a first flap valve,

[0017] a second flap valve arranged inside the body, the first and second flap valves being rotatably mobile about a first and a second axis respectively between a closed position and an open position,

[0018] a mechanism for locking the second flap valve in the closed position, the mechanism comprising:

[0019] - a control rod arranged about a third axis,

[0020] - an engagement arranged on the second flap valve, and

[0021] - a driving device for rotating the third axis.

[0022] The valve is characterized in that the control rod is rotatably mobile about the third axis between an unlocking position, in which the engagement rests against the driving device, and a locking position, in which the engagement engages the driving device.

[0023] Thus, the discharge valve according to the application comprises a mechanism for locking the second flap valve in the closed position, the mechanism comprising a control lever that can be moved rotationally between a locked position and an unlocked position. In the unlocked position, the engagement portion is in abutment with the drive device, in the locked position, the engagement portion is engaged with the drive device. The rotational movement of the control lever between the two positions is visible to the operator and confirms that the second flap valve is closed and locked. Thus, when the second flap valve is closed, the operator is reminded that the second flap valve is not properly locked if there is no second rotational movement of the control lever. Thus, the valve has a reliable mechanism for locking the second flap valve.

[0024] The valve according to the application can comprise one or more of the following features, taken alone or in combination with each other:

[0025] - the drive device comprises a rack having a toothed body cooperating with the third shaft and an end portion adapted to cooperate with the engagement portion,

[0026] - the end portion has a notch into which the engagement portion is adapted to engage and a free end with which the engagement portion can come into abutment,

[0027] - the drive device comprises a ring fixed to the third shaft, the ring having a surface with which the engagement portion can come into abutment and a groove into which the engagement portion is adapted to engage,

[0028] - the drive device comprises a first cylinder having a first cylindrical body and a first free end adapted to cooperate with the engagement portion and a second cylinder having a second cylindrical body and a second free end adapted to cooperate with the engagement portion, the third shaft being engaged in the first cylindrical body and in the second cylindrical body,

[0029] - the third shaft comprises a free end having a tenon and the first cylindrical body has a first housing and the second cylindrical body has a second housing, the tenon being engaged in the first housing and in the second housing,

[0030] - the second free end is bevelled,

[0031] - the third shaft is arranged in a wall mounted on the cylindrical body of the valve, opposite the first shaft and the second shaft with respect to the longitudinal axis of the cylindrical body,

[0032] - the main lever extending above the first flap valve is adapted to drive the first flap valve and the second flap valve from the open position to the closed position,

[0033] - the ring comprises a sharp end adapted to come into abutment with a complementary surface when the second flap valve is open,

[0034] - the ring has an inner surface adapted to come into abutment with a complementary surface of the junction when the second flap valve is open, the inner surface being connected to an outer surface of the ring by an edge forming a cusp,

[0035] - the control lever is rotationally movable in a first direction in the unlocked position and in a second direction opposite to the first direction in the locked position,

[0036] - the control lever is rotationally fixed with the third shaft.

[0037] The invention also relates to a method of locking the second flap valve of a valve according to any one of the above features, the method comprising the steps of:

[0038] (a') closing the second flap valve,

[0039] (b') rotating the control lever to an unlocked position in which the junction comes into abutment with the drive device,

[0040] (c') rotating the control lever to a locked position in which the junction is engaged with the drive device.

[0041] The invention also relates to an aircraft comprising at least one valve according to any one of the above features. BRIEF DESCRIPTION OF DRAWINGS

[0042] Other features and advantages will become apparent from the following description of non-limiting embodiments in accordance with the invention, with reference to the attached drawings, in which:

[0043] [ Figure 1 ] Figure 1 is a perspective view of a valve according to the invention in an open position;

[0044] [ Figure 2 ] Figure 2 is a simplified perspective view of a valve according to the invention in a closed position;

[0045] [ Figure 3 ] Figure 3 is an enlarged side view of a drive device of a mechanism for locking a valve according to a first example of embodiment;

[0046] [ Figure 4 ] Figure 4 is an enlarged side view of a drive device of a mechanism for locking a valve according to a second example of embodiment;

[0047] [ Figure 5 ] Figure 5 is an enlarged side view of a drive device of a mechanism for locking a valve according to a third example of embodiment;

[0048] [ Figure 6 ]Figure 6 is a top view of a component that can be assembled to a valve according to the application;

[0049] [ Figure 7 ] Figure 7 is an enlarged side view of a drive device of a mechanism for locking a valve according to a fourth example of an embodiment;

[0050] [ Figure 8 ] Figure 8 is a longitudinal cross-sectional view of a valve according to the application in a closed position and comprising Figure 7 a drive device. DETAILED DESCRIPTION

[0051] Figure 1 An exhaust valve 1 for an aircraft (not shown) is for example shown in a closed position. The valve 1 is typically arranged in the fuselage of the aircraft. The valve 1 can for example be used to close or open a waste water tank of the aircraft.

[0052] The valve 1 comprises a cylindrical body 2. The body 2 extends along a longitudinal axis X. The body 2 is for example made of a metallic material such as stainless steel. The body 2 is hollow to enable the flow of waste water into the valve 1. The body 2 has an inlet aperture 3 and an outlet aperture 4. The inlet aperture 3 is intended to be in fluid communication with the tank. The outlet aperture 4 is intended to be connected to a collection device and possibly a suction device (not shown) for the waste water.

[0053] Furthermore, the valve 1 comprises a first flap 5 and a second flap 6. The first flap 5 and the second flap 6 can be rotated or pivoted between a closed position and an open position. Advantageously, the first flap 5 and the second flap 6 open in the same direction. In the example of the embodiment shown, the first flap 5 and the second flap 6 open towards the outside with respect to the body 2 of the valve 1. Figure 1

[0054] The first flap 5 is used to reinforce the sealing of the valve 1. When the valve 1 is closed by the first flap 5 and the second flap 6, the first flap 5 covers the second flap 6. The first flap 5 is circular. Advantageously, it comprises a peripheral annular groove in which a first sealing member 5a is arranged. The first flap 5 can be moved rotationally around a first axis 50. The first axis 50 extends perpendicularly to the longitudinal axis X. Advantageously, the first axis 50 is mounted on the cylindrical body 2.

[0055] ​To facilitate the opening and closing of the first flap valve 5, the valve 1 comprises a main stem 51 extending over the first flap valve 5. The main stem 51 is longer than the diameter of the first flap valve 5. When the first flap valve 5 is closed, the main stem 51 has a first end opposite the first axis 50 and a second end opposite the first end, with respect to the longitudinal axis X. The main stem 51 comprises a handle 51a arranged on the second end and a locking hook 51b arranged on the first end of the main stem 51, which handle enables an operator to grasp the first flap valve 5. The handle 51a comprises for example an inner surface with a lug 51a' that can cooperate with the first flap valve 5 in a closed position to lock the main stem 51. The main stem 51 is rotatably movable about a stem axis 52 arranged on the first end. In the closed position of the first flap valve 5, the locking hook 51b cooperates with a locking stem 53 arranged on the cylindrical body 2. The locking stem 53 extends perpendicular to the longitudinal axis X and parallel to the first axis 50. The locking stem 53 is arranged opposite the first axis 50 with respect to the longitudinal axis X.

[0056] Furthermore, advantageously, the first flap valve 5 comprises a cam 54 extending from an inner surface of the first flap valve 5. The cam 54 can cooperate with the second flap valve 6 when the first flap valve 5 and the second flap valve 6 are closed.

[0057] The second flap valve 6 forms a first sealing barrier for the valve 1. The second flap valve 6 is intended to come into direct contact with the waste water in the tank. The second flap valve 6 is arranged inside the cylindrical body 2. In the closed position, the second flap valve 6 is in contact with the waste water. Advantageously, the second flap valve 6 is circular. The diameter of the second flap valve 6 is smaller than the diameter of the first flap valve 5. Advantageously, the second flap valve 6 comprises an outer peripheral annular groove in which a second sealing 6b is arranged. As Figure 2 is shown, the valve 1 is in the closed position without the cylindrical body 2 so that the elements located in the cylindrical body 2, such as the second flap valve 6, are visible. The second flap valve 6 can be rotated or pivoted about a second axis 60. The second axis 60 extends parallel to the first axis 50 and is arranged inside the cylindrical body 2.

[0058] As Figure 2 is shown, when the first flap valve 5 and the second flap valve 6 are closed, advantageously, the valve 1 comprises an intermediate space 7 delimited by the first flap valve 5 and the second flap valve 6.

[0059] Advantageously, the first flap valve 5 and the second flap valve 6 are simultaneously driven to the closed position. For example, the first flap valve 5 can abut against the second flap valve 6 to drive the second flap valve 6 to the closed position.

[0060] In addition, the valve 1 comprises a mechanism 8 for locking the second flap valve 6 in the closed position. The locking mechanism 8 comprises a control lever 9 arranged about a third axis 90, an engagement 10 arranged on the second flap valve 6 and a drive device 11 that rotates the third axis 90.

[0061] The junction 10 has a height measured along the longitudinal axis X equal to the height of the intermediate space 7. The junction 10 extends from the outer surface of the second flap valve 6. The junction 10 is arranged in the intermediate space 7. Thus, when the first flap valve 5 and the second flap valve 6 are closed, in order to facilitate the driving of the second flap valve 6 by the first flap valve 5 in the closed position, the junction 10 cooperates with the first flap valve 5, in particular with the cam 54.

[0062] The control lever 9 can be rotationally moved about the third axis 90 between a locked position and an unlocked position. In the locked position, the junction 10 is engaged with the driving device 11. In the unlocked position, the junction 10 is in abutment with the driving device 11. In particular, the control lever 9 can be rotationally moved in the locked position in a first direction and in the unlocked position in a second direction opposite to the first direction. When the second flap valve 6 is driven to the closed position, the junction 10 comes into abutment with the driving device 11 defining the unlocked position. It can be understood that, by abutment, the junction 10 is supported on the driving device 11. The force exerted by the junction 10 on the driving device 11 causes the third axis 90 and the control lever 9 to rotate in the second direction. Then, the junction 10 is engaged in the driving device 10, i.e. housed in this driving device, and no longer exerts any force on the driving device 11, which causes the third axis 90 and the control lever 9 to rotate in the first direction to the locked position.

[0063] When the second flap valve 6 is closed and locked, the control lever 9 extends along an axis parallel to the longitudinal axis X. This control lever has one end arranged about the third axis 90 and an opposite end. Preferably, a seal (not shown) is arranged between the control lever 9 and the third axis 90.

[0064] The third axis 90 extends parallel to the first axis 50 and the second axis 60. The third axis 90 is arranged in a wall mounted on the cylindrical body 2, opposite the first axis 50 and the second axis 60 with respect to the longitudinal axis X. The third axis 90 has a first free end on which the control lever 9 is arranged and a second free end opposite the first free end.

[0065] In Figure 3In the first embodiment shown, the drive device 11 comprises a rack. The rack extends along an axis perpendicular to the third axis 90 and to the longitudinal axis X. The rack comprises a toothed body 110 cooperating with the third axis 90 and an end portion 111 adapted to cooperate with the engagement portion 10. Advantageously, a third seal 112 is arranged between the toothed body 110 and the end portion 111. More particularly, the end portion 111 comprises a recess 111a and a free end 111b into which the engagement portion 10 is adapted to engage, the engagement portion 10 being able to come into abutment with the free end. The free end 111b has a first surface 111b' adapted to come into abutment with the hook 101 of the engagement portion 10 when the second flap valve 6 is open. The free end 111b also comprises a second surface 111b" adapted to come into abutment with the complementary first surface 100 of the engagement portion 10 when the second flap valve 6 is closed. The hook 101 is also adapted to engage in the recess 111a when the second flap valve 6 is closed and locked.

[0066] Advantageously, the drive device 11 comprises a spring 113 arranged on the end of the rack opposite the end portion 111.

[0067] According to this first embodiment, the operator drives the first flap valve 5 into rotation into the closed position, which drives the second flap valve 6 into rotation into the closed position. Then, the main rod 51 is locked to lock the first flap valve 5. At the same time, the engagement portion 10 of the second flap valve 6 comes into abutment with the free end 111b of the end portion 111 of the rack. This has the effect of driving the body 110 into translation in a first direction of rotation of the third axis 90 in a plane perpendicular to the longitudinal axis X. Then, the control rod 9 is driven into rotation in the first direction into the unlocked position. By the return force exerted on the body 110 by the spring 113, the rack is driven into translation in a second direction opposite the first direction. Then, the engagement portion 10 engages in the recess 111a to lock the second flap valve 6 in the locked position. The third axis 90 is driven into rotation by the rack, driving the control rod 9 into rotation in the second direction opposite the first direction into the locked position. If the return force is not sufficient, in particular in the presence of deposits on the second flap valve 6, this can also be done by the operator.

[0068] To open the second flap valve, the operator operates the control rod 9 in the first direction to drive the third axis 90 into rotation. Then, the rack is driven into translation until the first surface 111b' of the free end 111b of the end portion 111 of the rack comes into abutment with the hook 101 of the engagement portion 10. The force exerted by the rack on the engagement portion 10 serves to drive the second flap valve 6 into rotation to open it.

[0069] According to Figure 4In the second embodiment illustrated, the driving device 11 comprises a ring 211 fixed to the third shaft 90. Advantageously, the ring 211 is arranged on a second end of the third shaft 90 opposite the control lever 9. The ring 211 and the third shaft 90 form, for example, a one-piece body.

[0070] The ring 211 has a surface 212 against which the junction 10 can abut when the second flap valve 6 is closed and a groove 213 in which the junction 10 can engage when the second flap valve is locked.

[0071] In this second embodiment, the operator drives the first flap valve 5 into rotation into the closed position, which causes the second flap valve 6 to rotate into the closed position. Then, the main lever 51 is locked to lock the first flap valve 5. At the same time, the junction 10 of the second flap valve 6 abuts against the outer surface 212 of the ring 211. This causes the ring 211 to rotate in a first direction of rotation of the third shaft 90. Then, the control lever 9 is driven into rotation in the first direction into the unlocked position. The force exerted by the operator makes it possible for the junction 10 to engage in the groove 213 of the ring 211, causing the ring 211 to rotate in a second direction opposite the first direction. Then, the junction 10 is engaged in the groove 213 to lock the second flap valve 6 in the locked position. At the same time, the third shaft 90 rotates, causing the control lever 9 to rotate in the second direction opposite the first direction into the locked position.

[0072] To open the second flap valve, the operator operates the control lever 9 in the first direction to cause the third shaft 90 to rotate. The ring 211 is driven into rotation and the inner surface 214 comes into abutment with the complementary surface 400 of the junction 10. The force exerted by the ring 211 on the junction 10 makes it possible to drive the second flap valve 6 into rotation to open the second flap valve.

[0073] According to Figure 5 In the third embodiment illustrated, the driving device 11 comprises a first cylinder 311 having a first cylindrical body 311a and a first free end 311b adapted to cooperate with the junction 10, and a second cylinder 312 having a second cylindrical body 312a and a second free end 312b adapted to cooperate with the junction 10, the third shaft 90 being engaged in the first cylindrical body 311a and in the second cylindrical body 312a. Preferably, the second free end 312b is beveled. Advantageously, the first cylinder 311 and the second cylinder 312 are parallel. The first cylinder and the second cylinder also extend along an axis perpendicular to the third shaft 90 and to the longitudinal axis X.

[0074] Advantageously, the free end of the third shaft 90 comprises a tenon 313. The first cylindrical body 311a has a first housing 311c and the second cylindrical body 312a has a second housing 312c, the tenon 313 being engaged in the first housing 311c and in the second housing 312c.

[0075] In this third embodiment, the operator drives the first flap valve 5 in rotation to the closed position, which causes the second flap valve 6 to rotate to the closed position. Then, the main rod 51 is locked, so that the first flap valve 5 is locked. At the same time, the engagement 10 of the second flap valve 6 comes into abutment with the free end 311 of the first cylinder 311. This causes the first cylinder 311 to translate in the first direction, which in turn causes the tenon 313 to rotate in the first and second housings 311c, 312c, and thus the third shaft 90 to rotate. Then, the control rod 9 is driven in rotation in the first direction to the unlocked position. The force exerted by the operator enables the engagement 10 to be inserted between the first cylinder 311 and the second cylinder 312.

[0076] To open the second flap valve, the operator operates the control rod 9 in the first direction to drive the third shaft 90 in rotation. The tenon 313 is driven in rotation in each of the housings 311c, 312c. This has the effect of driving the second housing 312 in translation. The free end 312b of the second cylinder 312 comes into abutment with the engagement 10. Advantageously, the engagement 10 has a free end 500 with a shaped surface complementary to the bevelled free end 312b, so as to cooperate with the free end 312b of the second cylinder 312. The force exerted by the second cylinder 312 on the engagement 10 enables the second flap valve 6 to be driven in rotation to open it.

[0077] As Figure 6 illustrated, advantageously, the valve 1 comprises a locking indicator 12 for the second flap valve 6. The locking indicator 12 is arranged on the control rod 9 and the main rod 51. The locking indicator 12 comprises, for example, a first visual marking 12a arranged on the control rod 9 and a second visual marking 12b arranged on the main rod 51. In the closed and locked position of the second flap valve 6, the visual markings 12a, 12b are aligned. This increases the reliability of the locking of the second flap valve 6.

[0078] A method for opening the valve 1 will now be described.

[0079] The method for opening the valve 1 comprises a first step (a) of opening the first flap valve 5. The opening in step (a) is performed in the following sub-steps:

[0080] (a1) unlocking the main rod 51, and

[0081] (a2) rotating the first flap valve 5.

[0082] Then, a step (b) of opening the second flap valve 6 is performed. The opening is completed in the following sub-steps:

[0083] (b1 ) rotating the control lever 9 in a first direction. This drives the drive device 11 and disengages the engagement portion 10 from the drive device 11. Once the engagement portion 10 is released from the drive device 11, the control lever 9 is driven back in a second direction.

[0084] Now a method for locking the second flap valve 6 will be described. The method comprises the following steps:

[0085] (a') closing the second flap valve 6,

[0086] (b') rotating the control lever 9 to an unlocked position, preferably in a first direction to an unlocked position, in which the engagement portion 10 abuts the drive device 11,

[0087] (c') rotating the control lever 9 to a locked position, preferably in a second direction opposite to the first direction to a locked position, in which the engagement portion 10 is engaged in the drive device 11.

[0088] Advantageously, the step (a') comprises a sub-step (a1 ') of driving the first flap valve 5 to rotate and driving the second flap valve 6 to rotate by the first flap valve 5. This sub-step is performed for example by rotating the main lever 51.

[0089] Then, a sub-step (a2') of locking the first flap valve 5 is performed by locking the main lever 51.

[0090] Then, the first flap valve 5 and the second flap valve 6 are closed and locked.

[0091] Thus, according to the application, the second flap valve 6 can be reliably closed and locked since the control lever 9 can be rotationally moved in two opposite directions, indicating a correct locking of the second flap valve 6. Moreover, in case of deposits preventing the second flap valve 6 from properly closing and thus the control lever 9 from rotating back in the second direction to the locked position, the operator can directly operate the control lever 9 and force it to the locked position. This also improves the reliability of the mechanism 8 for locking the second flap valve 6.

[0092] According to the application, the control lever 9 is arranged around a third axis 90 and is rotationally fixed with the third axis 90.

[0093] According to the application, the second flap valve 6 can be rotationally moved between three positions. A first open position. A second unlocked closed position and a third locked closed position.

[0094] According to the application, the drive device 11 can be moved between two states. When the second flap valve 6 is in the second position, the drive device 11 is in a first state. When the second flap valve 6 is in the third position, the drive device 11 is in a second state. When the second flap valve 6 is in the first open position, the drive device 11 is in the second state.

[0095] In a first state of the drive device 11 associated with the second position of the second flap valve 6, the engagement portion 10 is in abutment with the drive device 11.

[0096] In a second state of the drive device 11 associated with the third position of the second flap valve 6, the engagement portion 10 is engaged in the drive device 11.

[0097] In a second state of the drive device 11 associated with the first position of the second flap valve 6, as shown in Figure 1 , the engagement portion 10 is not cooperating with the drive device 11.

[0098] When closing the second flap valve 6, the drive device 11 drives the third shaft 90 in rotation, which drives the control rod 9, which is fixed in rotation with the third shaft 90. The locking mechanism 8 of the application is reversible. This enables the second flap valve 6 to be opened. When opening the second flap valve 6, the control rod 9 rotates the third shaft 90 and drives the drive device 11 cooperating with the engagement portion 10 to open the second flap valve 6.

[0099] The drive device 11 cooperates with the third shaft 90 and the engagement portion 10. In particular, in all embodiments, the engagement portion 10 comprises a hook-shaped portion 101 adapted to engage a housing portion of the drive device 11 when the second flap valve 6 is in the closed and locked position. In a first example of embodiment, the housing portion is formed by a notch 111a.

[0100] In a second example of embodiment, the housing portion is formed by a groove 213.

[0101] In a third example of embodiment, the housing portion is formed by a space 300 delimited by the free end portion 311b of the first cylindrical body 311 and the free end portion 312b of the second cylindrical body 312. In the locked position of the control rod 9, the free end portion 311b of the first cylindrical body 311 is radially offset with respect to the free end portion 312b of the second cylindrical body 312, thereby forming the space 300.

[0102] According to a fourth example of embodiment, as shown in Figure 7 and Figure 8 , the drive device 11 comprises a ring 211. The ring 211 is housed in the main body 2 of the valve 1. As in the second example of embodiment, as shown in Figure 4 , the ring 211 is fixed to the third shaft 90. Thus, the third shaft 90 is housed in the main body 2.

[0103] The ring 211 has a C-shaped shape. The ring 211 has a surface 212, also called first surface 212, with which the junction 10 can come into abutment to cause the second flap valve 6 to close. The ring 211 also comprises a recess 213 in which the junction 10 can be engaged, in particular via the hook 101. The ring 211 also has an inner surface 214, also called second surface 214, with which the junction 10 can come into abutment when the second flap valve 6 is open.

[0104] The second surface 214 is perpendicular to the first surface 212. The ring 211 also comprises a third inner surface 215 parallel to the second surface 214 and connected to the first surface 212. The third inner surface 215 is connected to the second surface 214 by a rounded inner surface 216.

[0105] The hook 101 has a shape complementary to the ring 211. The hook 101 comprises a surface 400 complementary to the second surface 214 and a rounded portion 401 complementary to the rounded surface 216. The rounded portion 401 is protruding. The rounded portion 401 is housed in the recess 213 in the locked position.

[0106] To close the second flap valve, the hook 101, in particular the rounded portion 401, comes into abutment with the first surface 212, which causes the control lever 9 to rotate to its unlocked position. Then, the hook 101, in particular the rounded portion 401, is received in the recess 213, which causes the control lever 9 to rotate to its locked position.

[0107] The ring 211 has a tip 214’ which facilitates the opening of the second flap valve 6 by the junction 10 when the control lever 9 is operated to open the second flap valve 6. The tip 214’ comes into abutment with the complementary surface 400 of the junction 10, which makes it possible to drive the second flap valve 6 to rotate to open it by leverage. More particularly, the second surface 214 is connected to the outer surface 216 of the ring 211 by an edge forming the tip 214’.

[0108] The distance L between the center of the ring 211 and the tip 214’, measured radially with respect to the longitudinal axis X, is between 2 and 5 mm, preferably between 3 and 3.5 mm. Such a distance L makes it possible to exert sufficient leverage to force the second flap valve 6 to open, for example in the presence of deposits such as ice, which would prevent the second flap valve 6 from opening.

Claims

1. An exhaust valve (1) for an aircraft, the exhaust valve comprising: A cylindrical body (2) having an inlet hole (3) and an outlet hole (4). First valve (5). A second valve (6) is arranged inside the cylindrical body (2). The first valve (5) and the second valve (6) are rotatably movable between a closed position and an open position about a first axis (50) and a second axis (60), respectively. A mechanism (8) for locking the second valve (6) in the closed position, the mechanism comprising: - Control levers (9) arranged around the third axis (90). - The engagement portion (10) arranged on the second valve (6), and - A drive device (11) for rotating the third axis (90). The control lever (9) is fixed to rotate together with the third axis (90) between an unlocked position and a locked position. In the unlocked position, the engagement portion (10) abuts against the drive device (11), and in the locked position, the engagement portion (10) engages in the drive device (11). The drive device (11) includes a ring (211) fixed to the third shaft (90), the ring having a surface (212) and a groove (213), the engagement portion (10) being able to abut against the surface and engage in the groove, characterized in that the ring (211) includes a tip (214') adapted to abut against the complementary surface (400) of the engagement portion (10) when the second valve (6) is opened.

2. The discharge valve (1) according to claim 1, characterized in that, The third shaft (90) is arranged in the wall of the cylindrical body (2) mounted on the discharge valve (1), and is opposite to the first shaft (50) and the second shaft (60) relative to the longitudinal axis (X) of the cylindrical body (2).

3. The discharge valve (1) according to claim 1 or 2, characterized in that, The discharge valve includes a main rod (51) extending above the first valve (5), the main rod being adapted to drive the first valve (5) and the second valve (6) from the open position to the closed position.

4. The discharge valve (1) according to claim 1 or 2, characterized in that, The ring (211) has an inner surface (214) adapted to abut against the complementary surface (400) of the engagement (10) when the second valve (6) is opened, the inner surface (214) being connected to the outer surface (216) of the ring (211) by the edge forming the tip (214').

5. The discharge valve (1) according to claim 1 or 2, characterized in that, The control lever (9) is capable of rotating in the unlocked position along a first direction and in the locked position along a second direction opposite to the first direction.

6. A method for locking the second valve (6) of the discharge valve (1) according to any one of claims 1 to 5, the method comprising the steps of: (a') Closes the second valve (6). (b') Rotate the control lever (9) to the unlocked position, in which the engagement portion (10) abuts against the drive device (11). (c') Rotate the control lever (9) to the locked position, in which the engagement (10) engages with the drive device (11).

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