Internal combustion engine for a motor vehicle and motor vehicle having such an internal combustion engine

Abstract

An internal combustion engine has first and second combustion chambers, first and second exhaust gas line elements, and an exhaust gas turbocharger which has a first flood, a second flood, and a third flood. A bypass device has a bypass line that can be flowed through by exhaust gas from the first and second exhaust gas line elements and via the bypass line a turbine wheel is bypassed by a first part of the exhaust gas from the first and second exhaust gas line elements. A valve device includes a first valve element, via which an amount of the exhaust gas flowing through the bypass line and bypassing the turbine wheel from the first and second exhaust gas line elements is settable. A third exhaust gas line element opens out into the third flood.

Claims

1. An internal combustion engine (10) for a motor vehicle, comprising: a first combustion chamber (14); a second combustion chamber (16); a first exhaust gas line (44) through which exhaust gas from the first combustion chamber (14) is flowable; a second exhaust gas line (46) through which exhaust gas from the second combustion chamber (16) is flowable; an exhaust gas turbocharger (24), wherein the exhaust gas turbocharger includes: a turbine (34) having a turbine housing (36); a first flood (38) into which the first exhaust gas line (44) opens out; a second flood (40) into which the second exhaust gas line (46) opens out; a third flood (42) through which exhaust gas from the first and second combustion chambers (14, 16) is flowable; and a turbine wheel (50) received rotatably in the turbine housing (36); a bypass device (58) which has a bypass line (60) through which exhaust gas from the first exhaust gas line and the second exhaust gas line (44, 46) is flowable and via the bypass line (60) the turbine wheel (50) is bypassed by a first part of the exhaust gas from the first exhaust gas line and the second exhaust gas line (44, 46); a valve device (64) which includes a first valve element (66) via which an amount of the exhaust gas flowing through the bypass line (60) and bypassing the turbine wheel (50) from the first exhaust gas line and the second exhaust gas line (44, 46) is settable; a third exhaust gas line (48) which opens out into the third flood (42); and a second valve element (68) that is fluidically connected to the first exhaust gas line and the second exhaust gas line (44, 46), has a main flood connection (70) via which the first exhaust gas line and the second exhaust gas line (44, 46) in the second valve element (68) are fluidically connectable to each other, and that is switchable between: a first state, in which the third exhaust gas line (48) is fluidically connected to the first exhaust gas line and the second exhaust gas line (44, 46) via the second valve element (68) and thus is provided with exhaust gas from the first exhaust gas line and the second exhaust gas line (44, 46), while the main flood connection (70) is closed by the second valve element (68); a second state, in which the main flood connection (70) is closed and the third exhaust gas line (48) is separated from the first exhaust gas line and the second exhaust gas line (44, 46) by the second valve element (68); a third state, in which the third exhaust gas line (48) is separated from the first exhaust gas line and the second exhaust gas line (44, 46) by the second valve element (68), and the main flood connection (70) is released, such that the first exhaust gas line and the second exhaust gas line (44, 46) are fluidically connected to each other via the second valve element (68); and a fourth state, in which the third exhaust gas line (48) is fluidically connected to the first exhaust gas line and the second exhaust gas line (44, 46) via the second valve element (68) and thus is provided with exhaust gas from the first exhaust gas line and the second exhaust gas line (44, 46), and the main flood connection (70) is released, such that the first exhaust gas line and the second exhaust gas line (44, 46) are fluidically connected to each other via the second valve element (68); wherein the first valve element (66) has a first valve part for setting the amount of the exhaust gas, the first valve part being movable for setting the amount of the exhaust gas; and the second valve element (68) has a second valve part formed separately from the first valve part, the second valve part being movable for switching the second valve element (68).

2. The internal combustion engine (10) according to claim 1, wherein the second valve part is pivotable around a picoting axis.

3. An internal combustion engine (10) for a motor vehicle, comprising: a first combustion chamber (14); a second combustion chamber (16); a first exhaust gas line (44) through which exhaust gas from the first combustion chamber (14) is flowable; a second exhaust gas line (46) through which exhaust gas from the second combustion chamber (16) is flowable; an exhaust gas turbocharger (24), wherein the exhaust gas turbocharger includes: a turbine (34) having a turbine housing (36); a first flood (38) into which the first exhaust gas line (44) opens out; a second flood (40) into which the second exhaust gas line (46) opens out; a third flood (42) through which exhaust gas from the first and second combustion chambers (14, 16) is flowable; and a turbine wheel (50) received rotatably in the turbine housing (36); a bypass device (58) which has a bypass line (60) through which exhaust gas from the first exhaust gas line and the second exhaust gas line (44, 46) is flowable and via the bypass line (60) the turbine wheel (50) is bypassed by a first part of the exhaust gas from the first exhaust gas line and the second exhaust gas line (44, 46); a valve device (64) which includes a first valve element (66) via which an amount of the exhaust gas flowing through the bypass line (60) and bypassing the turbine wheel (50) from the first exhaust gas line and the second exhaust gas line (44, 46) is settable; a third exhaust gas line (48) which opens out into the third flood (42); and a second valve element (68) that is fluidically connected to the first exhaust gas line and the second exhaust gas line (44, 46), has a main flood connection (70) via which the first exhaust gas line and the second exhaust gas line (44, 46) in the second valve element (68) are fluidically connectable to each other, and that is switchable between: a first state, in which the third exhaust gas line (48) is fluidically connected to the first exhaust gas line and the second exhaust gas line (44, 46) via the second valve element (68) and thus is provided with exhaust gas from the first exhaust gas line and the second exhaust gas line (44, 46), while the main flood connection (70) is closed by the second valve element (68); a second state, in which the main flood connection (70) is closed and the third exhaust gas line (48) is separated from the first exhaust gas line and the second exhaust gas line (44, 46) by the second valve element (68); a third state, in which the third exhaust gas line (48) is separated from the first exhaust gas line and the second exhaust gas line (44, 46) by the second valve element (68), and the main flood connection (70) is released, such that the first exhaust gas line and the second exhaust gas line (44, 46) are fluidically connected to each other via the second valve element (68); and a fourth state, in which the third exhaust gas line (48) is fluidically connected to the first exhaust gas line and the second exhaust gas line (44, 46) via the second valve element (68) and thus is provided with exhaust gas from the first exhaust gas line and the second exhaust gas line (44, 46), and the main flood connection (70) is released, such that the first exhaust gas line and the second exhaust gas line (44, 46) are fluidically connected to each other via the second valve element (68); wherein the second valve element (68) has a first valve region (79) with a first channel (88), a second channel (90), and a separating wall (92), wherein in the first state: the first channel (88) is fluidically connected to the first exhaust gas line (44); the second channel (90) is fluidically connected to the second exhaust gas line (46); the first channel and the second channel (88, 90) are fluidically connected to the third exhaust gas line element (48); and the main flood connection (70) is closed by the separating wall (92).

4. The internal combustion engine (10) according to claim 3, wherein the second valve part (68) has a second valve region (80) via which, in the second state, the main flood connection (70) is closed and the third exhaust gas line (48) is separated from the first exhaust gas line and the second exhaust gas line (44, 46).

5. The internal combustion engine (10) according to claim 4, wherein the second valve element (68) has a third valve region (82) via which, in the third state, the main flood connection (70) is released and the first exhaust gas line and the second exhaust gas line (44, 46) are fluidically connected to each via a connection channel (92) and the third exhaust gas line (48) is separated from the first exhaust gas line and the second exhaust gas line (44, 46).

6. The internal combustion engine (10) according to claim 5, wherein the second valve element (68) has a fourth valve region (84) with a third channel (94) and a fourth channel (96), wherein in the fourth state: the third channel (94) is fluidically connected to the first exhaust gas line element (44); the fourth channel (96) is fluidically connected to the second exhaust gas line element (46); the third channel and the fourth channel (94, 96) are fluidically connected to one another via the main flood connection (70) via a connection channel (98); and the third channel and the fourth channel (94, 96) are fluidically connected to the third exhaust gas line (48).

7. The internal combustion engine (10) according to claim 6, wherein the first, second, third, and fourth valve regions (79, 80, 82, 84) are movable translationally such that the second valve element (58) is switchable among the at least one of the first state, the second state, the third state, and the fourth state.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic depiction of an internal combustion engine according to the invention;

(2) FIG. 2 shows, in sections, a schematic sectional view of a valve element of the internal combustion engine according to a first embodiment; and

(3) FIG. 3 shows, in sections, a schematic sectional view of the valve element according to a second embodiment.

DETAILED DESCRIPTION OF THE DRAWINGS

(4) In the Figures, the same or functionally identical elements are provided with the same reference numerals.

(5) FIG. 1 shows, in a schematic depiction, an internal combustion engine 10 for a motor vehicle, in particular for a car such as a passenger motor vehicle, for example. The internal combustion engine 10 has a motor housing 12 formed, for example, as a cylinder housing, in particular as a cylinder crankcase, by means of which combustion chambers in the form of cylinders 14 and 16 are formed. The cylinders 14 belong to a first group or form a first group of cylinders, which the cylinders 16 belong to a second group of cylinders or form a second group of cylinders. The first group is also referred to as the first part, while the second group is also referred to as the second part of the cylinders 14 and 16.

(6) The internal combustion engine 10 has a suction pipe 18 that can be at least flowed through by air, by means of which the air flowing through the suction pipe 18 is guided to, in particular into, the cylinders 14 and 16. Here, the air filter 20 is arranged in the suction pipe 18 for filtering air. Moreover, a valve device formed, for example, as a throttle valve 22, is arranged in the suction pipe 18, by means of which valve device an amount of the air flowing through the suction pipe 18, the amount flowing into the cylinders 14 and 16, can be set.

(7) The internal combustion engine 10 furthermore has at least one exhaust gas turbocharger 24, which has a compressor 26 arranged in the suction pipe 18 having at least one compressor wheel 28. The air flowing through the suction pipe 18 is compressed by means of the compressor wheel 28. In doing so, the air is heated. In order to achieve a particularly high degree of charging, a charging air cooler 30 is arranged in the suction pipe 18 downstream of the compressor 26, by means of which charging air cooler the compressed and thus heated air is cooled before the compressed air flows into the cylinders 14 and 16.

(8) In a fueled operation of the internal combustion engine 10, the air and a particularly fluid fuel is supplied to the cylinders 14 and 16, the filet being injected directly into the cylinders 14 and 16, for example. In doing so, in the respective cylinder 14 or 16, a fuel-air mixture emerges, which is ignited, in particular by extraneous ignition and thus burned. This results in the exhaust gas of the internal combustion engine 10, which has an exhaust gas section 32 that exhaust gas can flow through. The exhaust gas is conducted away from the cylinders 14 and 16 by means of the exhaust gas section 32. The exhaust gas turbocharger 24 here has a turbine 34 arranged in the exhaust gas section 32 having a turbine housing 36. The turbine housing 36 has a first flood 38, a second flood 40 and a third flood 42, wherein the floods 38 and 40 are main floods of the turbine 34. The flood 42 is an auxiliary flood of the turbine 34.

(9) It can be seen in FIG. 1 that the exhaust gas section 32 has a first exhaust gas line element 44 allocated to the first flood 38 and opens out into the first flood 38 and is here fluidically connected to the first flood 38. Moreover, the exhaust gas section 32 comprises a second exhaust gas line element 46, which is allocated to the second flood 40 and here opens out into the second flood 40 and is fluidically connected to the second flood 40. Moreover, a third exhaust gas line element 48 of the exhaust gas section 32 is provided, wherein the third exhaust gas line element 48 is allocated to the third flood 42 and here opens out into the third flood 42 and is fluidically connected to the third flood 42. The exhaust gas line elements 44, 46 and 48 are also referred to as flood or exhaust gas floods.

(10) The turbine housing 36 has a receiving chamber 52 into which the floods 38, 40 and 42 open out. The floods 38, 40 and 42 can be flowed through by exhaust gas and serve to conduct exhaust gas flowing through the floods 38, 40 and 42 into the receiving chamber 52. Here, the turbine 34 has a turbine wheel, which is arranged rotatably in the receiving chamber 52. Thus, the turbine wheel 50 can be rotated around an axis of rotation relative to the turbine housing 36. The exhaust gas introduced into the receiving chamber 52 via the floods 38, 40 and 42 can flow into and thus drive the turbine wheel 50, whereby the turbine wheel 50 is rotated around the axis of rotation. Here, the floods 38, 40 and 42 are spiral channels, which extend substantially helically in the peripheral direction of the turbine wheel 50 across its periphery.

(11) The turbine wheel 50 and the compressor wheel 28 are components of a rotor 54 of the exhaust gas turbocharger 24. Here, the rotor 54 also comprises a shaft 56, which is non-rotationally connected to the compressor wheel 28 and to the turbine wheel 50. As a result of the turbine wheel 50 being driven by exhaust gas, the compressor wheel 28 is driven via the shaft 56 of the turbine wheel 50. In doing so, the air flowing through the suction pipe 18 is compressed by means of the compressor wheel 28, whereby energy contained in the exhaust gas is used for compressing the air.

(12) Furthermore, the internal combustion engine 10 has a bypass device 58, which has at least one bypass line 60. The turbine wheel 50 is to be bypassed by at least one part of the exhaust gas from the combustion chambers (cylinders 14 and 16) via the bypass line 60. This means that the exhaust gas flowing through the bypass line 60 does not drive the turbine wheel 50 but is conducted past the turbine wheel 50. Here, the bypass line 60 is fluidically connected to the exhaust gas section 32 at at least one first connection point and at least one second connection point, wherein the first connection point is arranged upstream of the turbine wheel 50 and the second connection point is arranged downstream of the turbine wheel 50.

(13) Furthermore, at least one exhaust gas post-treatment device 62 is arranged in the exhaust gas section 32, by means of which device the exhaust gas can be post-treated. Here, the exhaust gas post-treatment device 62 is arranged downstream of the second connection point. Moreover, the internal combustion engine 10 comprises a valve device 64, which has a first valve element 66 and a second valve element 68. The respective valve element 66 or 68 is also referred to as setting body. The first valve element 66 is also referred to as a waste gate, since it is used to set an amount of the exhaust gas flowing through the bypass line 60 and thus bypassing the turbine wheel 50. This bypassing of the turbine wheel 50 is also referred to as blowing-off or releasing, such that the bypass line 60 and the waste gate are used for blowing off.

(14) As can be seen in FIG. 1, the bypass line 60 is fluidically connected to the exhaust gas line elements 44 and 46 via the first valve element 66, such that exhaust gas from at least one of the cylinders 16 and exhaust gas from at least one of the cylinders 14, for example, can flow into the bypass line 60 via the valve element 66. Thus, the amount of exhaust gas flowing through the bypass line 60 from the exhaust gas line elements 44 and 46 can be set by means of the first valve element 66.

(15) During the fueled operation of the internal combustion engine 10, the cylinders 14 convey their exhaust gas into the exhaust gas line element 44 yet not into the exhaust gas line element 46, such that the cylinders 14 are guided together to the exhaust gas line element 44. During the fueled operation, the cylinders 16 convey their exhaust gas into the exhaust gas line element 46 yet not into the exhaust gas line element 44, such that the cylinders 16 are guided together to the exhaust gas line element 46. Here, at least one part of the exhaust gas from at least one of the cylinders 14 and at least one part of the exhaust gas from at least one of the cylinders 16 can be branched off and led into the bypass line 60 via the first valve element 66, such that the exhaust gas flowing through the bypass line 60 comes, for example, from both at least one of the cylinders 14 and from at least one of the cylinders 16.

(16) In order to now be able to achieve a particularly advantageous operation, the second valve element 68 is fluidically connected to the exhaust gas line elements 44 and 46. Moreover, the second valve element 68, as can be seen particularly well when viewed together with FIG. 2, has at least one main flood connection 70, via which the exhaust gas line elements 44 and 46 and thus the main floods, for example, can be fluidically connected to one another. As can also be seen particularly well when viewed together with FIG. 2, the second valve element 68 can be switched between a first state, a second state, a third state and a fourth state. In the first state, the third exhaust gas line element 48 is fluidically connected to the exhaust gas line elements 44 and 46 via the second valve element 68 and thus can be provided with exhaust gas from the exhaust gas line elements 44 and 46, while the main flood connection 70 is closed or blocked. In doing so, at least one respective part of the exhaust gas flowing through the respective exhaust gas line elements 44 and 46, for example, from the exhaust gas line elements 44 and 46 is branched off and guided into the third exhaust gas line element 48 or auxiliary flood via the second valve element 68. Here, a flood connection of the main floods is separated or interrupted, since the main flood connection 70 is blocked, in doing so, a pulse charging or a pulse charging operation, for example, can be depicted. In the second state, the main flood connection 70 is closed, and the third exhaust gas line element 48 is separated from the exhaust gas line elements 44 and 46 by means of the second valve element 68. Thus, if, in the first state, the auxiliary flood is switched on or activated, in the second state, the auxiliary flood is deactivated or switched off. Both in the first state and in the second state, a flood connection of the main floods is interrupted.

(17) In the third state, the third exhaust gas line element 48 is separated from the exhaust gas line elements 44 and 46 by means of the second valve element 68, whereby the auxiliary flood is switched off. However, the main flood connection 70 released, such that the exhaust gas line elements 44 and 46 are fluidically connected to one another via the second valve element 68. Thus, in the third state, a flood connection of the main flood is activated or set, such that a congestion charging or congestion charging operation, for example, can be achieved.

(18) In the fourth state, the third exhaust gas line element 48 is fluidically connected to the exhaust gas line elements 44 and 46 via the second valve element 68 and thus can be supplied with exhaust gas from the exhaust gas line element 44 and 46, while the main flood connection 70 is released, such that the exhaust gas line elements 44 and 46 are fluidically connected to one another via the second valve element 68, in particular in the valve element 68. Thus, the flood connection of the main floods in the fourth state is set or activated.

(19) FIG. 2 shows a first embodiment of the second valve element 68. The second valve element 68 has a valve housing 72, for example, having a first port 74, a second port 76 and a third port 78. The valve element 68 is fluidically connected to the exhaust gas line element 44, for example, and thus to the first flood 38 via the port 74, the flood also being referred to as the main flood. The valve element 68 is fluidically connected to the exhaust gas line element 46 and thus to the second flood 40 via the port 76, the flood also being referred to as the second main flood. The valve element 68 is fluidically connected to the third exhaust gas line element 48 and thus to the auxiliary flood, for example, via the port 78.

(20) Here, the valve element 68 has four valve regions 79, 80, 82 and 84, which are, for example, respective valve parts of the valve element 68. The valve regions 79, 80, 82 and 84 can be moved translationally, in particular relative to the valve housing 72, in order to thus switch the valve element 68 between the four states. Here, in FIG. 2, dual arrows 86 illustrate the movement or the moveability of the valve regions 79, 80, 82 and 84 relative to the valve housing 72. The valve regions 79, 80, 82 and 84 are thus used to achieve four states of the valve element 68. Here, the valve parts of the valve element 68 are formed separately, for example, from a valve part of the valve element 66 and are provided in addition to the valve part of the valve element 66, wherein the valve part of the valve element 66 is also referred to as a further valve part. The amount of exhaust gas flowing through the bypass line 60 can be set by means of the further valve part, for example. Here, the valve element 66 has a first actuator, for example, which is also referred to as the first setting member. The further valve part can be moved by means of the first actuator in order to thus set the amount of the exhaust gas flowing through the bypass line 60. The valve element 68 has a second actuator, for example, which is also referred to as the second setting member. Here, the valve parts of the valve element 68 can be moved, for example, by means of the second actuator, in order to thus be able to switch the valve element 68 between the states. In particular, it is possible to control the actuators of the valve elements 66 and 68 separately or independently of one another, such that the valve parts of the valve elements 66 and 68, for example, can be moved relative to one another. This is to be understood to mean, in particular, that the valve regions 79, 80, 82 and 84 of the valve element 68 can be moved, while there is no movement of a further valve part of the valve element 68 and/or vice versa. Thus, a function separation can be depicted, in the scope of which the functions of the flood separation or flood connection and the blowing off can be held separately or can be carried out separately from one another. In the first embodiment shown in 2, the valve parts of the valve element 68 can be moved or shifted translationally, in particular in relation to the valve housing 72, whereby the second valve element 68 can be switched between the states.

(21) Here, the first valve region 79 has two channels 88 and 90 and a separating wall 92 separating the channels 88 and 90 from one another and arranged between the channels 88 and 90. In the first state, the channel 88 is fluidically connected to the exhaust gas line element 44 via the port 74, and the second channel 90 is fluidically connected to the exhaust gas line element 46 via the port 76. Furthermore, the channels 88 and 90 are fluidically connected to the exhaust gas line element 48 via the port 78. The exhaust gas from the exhaust gas line elements 44 and 46 can thus flow into the channels 88 and 90 via the ports 74 and 76, flow through the channels 88 and 90 and, from the channels 88 and 90, flow into the exhaust gas line element 48 and flow further into the auxiliary flood and flow through the auxiliary flood. Furthermore, in the first state, the main flood connection 70 is closed and thus fluidically blocked by means of the separating wall 92 separating the channels 88 and 90 from each other.

(22) In the second state, the main flood connection 70 is fluidically blocked by means of the valve region 80, and the exhaust gas line element 48 is separated from the exhaust gas line elements 44 and 46 by means of the valve regions 80.

(23) In the third state, the main flood connection 70 is released by means of the third valve region 82, such that the exhaust gas line elements 44 and 46 and thus the main floods are fluidically connected to one another via the main flood connection 70 by means of a connection channel 92. Here, in the third state, the third exhaust gas line element 48 is separated from the exhaust gas line elements 44 and 46 by means of the third valve region 82.

(24) The fourth valve region 84 has two further channels 94 and 96, which are fluidically connected to each other via a connection channel 98 of the valve region 84. In the fourth state, the further channel 94 is fluidically connected to the exhaust gas line element 44, while the further channel 96 is fluidically connected to the exhaust gas line element 46. Furthermore, in the fourth state, the further channels 94 and 96 are fluidically connected to one another via the main flood connection 70, since, in the fourth state, for example, the connection channel 98 is arranged in the main flood connection 70. Moreover, in the fourth state, the further channels 94 and 96 are fluidically connected to the third exhaust gas line element 58, such that, in the fourth state, the exhaust gas line element 48 is connected to the exhaust gas line elements 44 and 46 via the further channels 94 and 96. Here, in FIG. 2, arrows not provided with reference numerals illustrate the exhaust gas flowing through the respective valve region 79, 80, 82 and 84.

(25) FIG. 3 shows a second embodiment of the second valve element 68. Here, the valve element 68 has at least one valve part 100, which—as illustrated in FIG. 3 by a dual arrow 102—can be pivoted around a pivoting axis 104 relative to the valve housing 72. FIG. 3 shows, for example, a closed position of the valve part 100, wherein, in the closed position, the main flood connection 70 is fluidically blocked by means of the valve part 100. Furthermore, in the closed position, the port 78 is separated from the ports 74 and 76 by means of the valve part 100, such that the exhaust gas line element 48 is fluidically separated from the exhaust gas line elements 44 and 46. The valve part 100 can be pivoted, for example, between the closed position and at least one open position relative to the valve housing 72, wherein the at least one open position is illustrated by doubled lines in FIG. 3. In the open position, the valve part 100 releases, for example, both the main flood connection 70 and a fluid connection of the port 78 to the ports 74 and 76, such that, in the at least one open position, for example both the main flood connection 70 is released and the exhaust gas line element 48 is fluidically connected to the exhaust gas line elements 44 and 46.

(26) In comparison to conventional internal combustion engines, it is possible to design the main flood to be particularly small, whereby a particularly advantageous pulse charging operation can be depicted. Furthermore, in line with demand, it can be switched between the pulsed charging operation and the congestion charging operation. Furthermore, the function separation mentioned above can be achieved, such that a particularly advantageous operation can be achieved.

LIST OF REFERENCE CHARACTERS

(27) 10 Internal combustion engine 12 Motor housing 14 Cylinder 16 Cylinder 18 Suction pipe 20 Air filter 22 Throttle valve 24 Exhaust gas turbocharger 26 Compressor 28 Compressor wheel 30 Charge air cooler 32 Exhaust gas section 34 Turbine 36 Turbine housing 38 First flood 40 Second flood 42 Third flood 44 First exhaust gas line element 46 Second exhaust gas line element 48 Third exhaust gas line element 50 Turbine wheel 52 Receiving chamber 54 Rotor 56 Shaft 58 Bypass device 60 Bypass line 62 Exhaust gas post-treatment device 64 Valve device 66 First valve element 68 Second valve element 70 Overflow opening 72 Valve housing 74 Port 76 Port 78 Port 79 First valve region 80 Second valve region 82 Third valve region 84 Fourth valve region 86 Dual arrow 88 Channel 90 Channel 92 Connection channel 94 Further channel 96 Further channel 98 Connection channel 100 Valve part 102 Dual arrow 104 Pivot axis