DE10333218A1 - (2-valve) valve with shut-off valve for controlling gas flows - Google Patents

Abstract

The invention relates to a valve (37) for controlling gas flows (16, 17), such as partial exhaust gas streams of an internal combustion engine (30). These are fed to a valve housing (1) forming a mixing chamber (2) at inlets (8, 9). An outlet opening (7) of the mixing chamber (2) can be opened or closed by a surface (3, 28) movable between an open position (19) and a sealing position (15) via an actuator (5, 6). The valve housing (1) has inlets (8, 9) which are controllable relative to one another via a shut-off element (10, 21, 22, 27) with regard to their degree of opening.

Description

technical area

valves, which may be formed single or multi-flow, and with a butterfly valve interact, are used on internal combustion engines. In particular, such valves in the intake or in the exhaust system used an internal combustion engine. In today's automobiles is an exhaust gas recirculation, i. a removal of exhaust gas behind the outlets of the internal combustion engine and the admixture of exhaust gas to the fresh air, that of the internal combustion engine supplied on the inlet side becomes widespread. about the mixing of already burned exhaust gas to the air-fuel mixture in the intake the combustion peak temperature can be lowered.

State of technology

Out the state of the art, "Automotive Paperback / Bosch " 23rd, updated and expanded edition - Brunswick; Wiesbaden: Vieweg 1999, ISBN 3-528-03876-4, p. 501 and p. 502, is an exhaust gas recirculation system known. The exhaust gas recirculation system includes an exhaust gas recirculation line via which From the exhaust duct or the exhaust gas ducts exhaust gas is diverted. In the exhaust gas recirculation line is an exhaust gas recirculation valve recorded, which for example via an electropneumatic converter actuated is. The electropneumatic converter in turn is about a control unit actuated. The input quantities of the control unit are the speed of the internal combustion engine and the input signal an air mass meter, in the intake of the internal combustion engine is arranged.

The Engine control unit controls dependent from the operating point of the internal combustion engine, the exhaust gas recirculation valve to which a partial flow of the exhaust gas is supplied to the fresh mixture and at constant fresh air filling the entire filling the cylinder of the internal combustion engine increases. In this way you have to the Verbrennungskraftma engine are less throttled to a to achieve certain torque, which advantageously with associated with a lower fuel consumption.

It is known, the recoverable torque, which is proportional for fresh gas filling behave by increasing the air in the cylinder. For this purpose can Charging devices, e.g. Exhaust gas turbocharger or pressure wave charger, be used.

presentation the invention

The proposed according to the invention Valve optional with butterfly valve, allows an improvement of the Exhaust gas extraction, since with the valve, the exhaust gas extraction symmetrical two exhaust banks done can. Under exhaust banks In the following, the outlet side of the exhaust valves of the internal combustion engine associated, opening into a common exhaust pipe elbow on the crankcase understood the internal combustion engine. Will the valve in an advantageous manner operated by a lifting armature, let yourself arrange a butterfly valve below a plate of the lifting armature, so an extra actuator for the Butterfly valve can be saved. The inventively proposed solution of hubankerbetätigten Valve allows the abandonment of another, second valve.

by virtue of of the symmetrical construction of the valve housing is a symmetrical Removal of the exhaust gas from exhaust banks of internal combustion engines possible. The below a plate-shaped closing element of the pantograph operator Valve arranged shut-off valve prevents as possible to avoid transmission of pressure pulsations between the exhaust banks of the internal combustion engine. A mixing of the two mass flows is also without additional sealing measures through the hub-operated butterfly valve guaranteed. A mixing of the two mass flows within a mixing chamber is advantageous because these mass flows may have different chemical compositions, the can be equalized by mixing, so that the exhaust aftertreatment can be favorably influenced.

in the general ignite the individual cylinders of an internal combustion engine assigned to the two exhaust banks are, alternately. Due to the discontinuous emission of exhaust gas it comes in the exhaust pipes to pressure pulsations. Through the inside the mixing chamber arranged shut-off can reduce the performance of the internal combustion engine be reduced, which therefore stir that occurring in an exhaust bank pressure pulsations, the exhaust back pressure on exhaust valves of the other exhaust bank.

The through the plate-shaped Closing element of Hubankers actuated within the valve housing butterfly valve can according to a first embodiment be formed in one piece of the invention. The butterfly valve can on one side of the valve body by means of a spring element which serves as a return spring, biased be.

The butterfly valve is hinged to the Un hinged side of the hub armature operated plate-shaped closing element of the valve and lies with its the pivot point on the plate-shaped closing element of the lifting armature opposite end on the bottom of the valve housing. According to the deflection in the horizontal direction by the lifting armature actuated closing element, the shut-off flap is more or less deflected and the closable by the closing element opening more or less turned on.

In a further advantageous embodiment, the below operated by the lifting armature closing element arranged butterfly valve, 2-hinged interconnected surface parts (Flap segments) include. The two flap segments can via a Hinge are connected to each other, the lower of the flap segments over a Hinge can be hinged to a wall of the valve housing, while that upper of the flap segments over another hinge on the plate-shaped closing element is articulated. In contrast to the former embodiment can with this embodiment an execution of pivoting movement allows become.

In a further embodiment the idea underlying the invention, the valve housing, which the mixing chamber for the exhaust gas mass flows represents be designed as a hollow cylinder. Inside the hollow cylinder can be a cylindrical trained shut-off are arranged, which in turn via a Return spring is charged. The slide element can via an actuator against the Effect of this acting spring element to be moved and gives inlets into the valve body, over which the exhaust gas streams from the exhaust banks in the valve body enter, symmetrically free according to its stroke. Corresponding of the released flow cross-section the two inlets in the hollow cylinder occur in the closed state by the shut-off closed outlet openings according to this variant a sum exhaust gas mass flow.

The mentioned embodiments the invention proposed solution can in motor vehicles with gasoline or diesel engine as exhaust gas recirculation valves be used. The internal combustion engine preferably has two separate exhaust banks on. The branches off from the two separate exhaust banks Supply lines for inventively proposed Exhaust gas recirculation valve are preferably formed symmetrically to each other, so that the flow paths of the exhaust gas can be kept largely identical. from Exhaust gas recirculation valve ends a common line in the intake tract, e.g. the suction pipe the internal combustion engine, where the from the exhaust tract of the internal combustion engine dissipated Exhaust gas between an air guide device such as. a throttle device and the intake side of the internal combustion engine is introduced into the intake tract.

drawing

Based In the drawings, the invention will be described below in more detail.

It shows:

1.1 A first embodiment of the valve according to the invention in its sealing position,

1.2 the first embodiment of the valve in an open position, 1.3 the top view of the valve in the sealing position according to 1.1 . 2.1 a second embodiment of the valve with divided butterfly valve in sealing position,

2.2 the second embodiment of the valve with divided butterfly valve in the open position,

3.1 a third embodiment of the valve with a cylindrically shaped closing element in sealing position,

3.2 the third embodiment of the valve with a cylindrically shaped closing element in the open position and

4 a system overview of the exhaust gas recirculation using the proposed valve according to the invention,

5 a fourth embodiment of the valve according to the invention in its sealing position and

6 the fourth embodiment of the valve in its open position.

variants

1.1 the first embodiment of the present invention proposed valve in its sealing position can be removed.

A valve 37 for controlling gas flows 16 and 17 includes a valve housing 1 which is a mixing chamber 2 limited. In the in the mixing chamber 2 entering gas streams 16 . 17 For example, it may be derived from an exhaust tract of an internal combustion engine act gas streams that are admixed to an intake of an internal combustion engine. Inside the mixing chamber 2 of the valve housing 1 is a plate-shaped closure element 3 taken, which has a pestle 4 or a similarly designed component with an actuator 5 a writer 6 connected is. At the actor 5 it may be, for example, an anchor of a Hubanker valve. By means of the plate-shaped closing element 3 becomes an outlet opening 7 of the valve housing 1 released or closed. In the illustration according to 1.1 is the closing element 3 its sealing position 15 engaging.

At the substantially symmetrical valve housing 1 There is a first inlet 8th through which a first gas flow 16 into the mixing chamber 2 entry; this opposite is located on a side wall of the valve housing 1 a second inlet 9 over which the second gas stream 17 into the mixing chamber 2 of the valve housing 1 entry. Below the closing element 3 is at a linkage 11 a newly trained, areal shut-off 10 added. The shut-off element 10 includes an edition 12 on a floor 13 of the valve housing 1 rests. The flat shut-off 10 according to the in 1 shown first embodiment of the solution proposed by the invention is about a trained example as a tension spring return element 14 applied. The reset element 14 is on a side wall of the valve housing 1 added. In the in 1.1 illustrated sealing position 15 of the closing element 3 is the outlet opening 7 of the valve housing 1 by sealing engagement of the top of the closing element 3 to a contact surface on the valve housing 1 locked. Under sealing position is understood in the following a position in which one of the respective dimensions of the valve housing 1 dependent leakage air mass flow the shut-off element 10 or the further embodiment variants of the shut-off elements 21 . 22 and 27 can still happen. The respectively approved, self-adjusting leakage mass flow depends on the dimensioning of the outlet opening 7 and the shut-off elements 10 . 21 . 22 . 27 ,

This in 1.1 valve shown, for example, as an exhaust gas recirculation valve 37 be used in the exhaust system of an internal combustion engine.

In 1.2 the first embodiment of the proposed valve according to the invention is shown in an open position.

In the in 1.2 illustrated opening position 19 of the plate-shaped closing element 3 this is according to a travel of the actuator 5 into the interior of the mixing chamber 2 retracted. The top of the plate-shaped closing element 3 moves away from one on the valve body 1 trained contact surface 20 , According to the lifting movement of the plunger 4 , with the plate-shaped closing element 3 is connected, this drives into the mixing chamber 2 into it. This will cause the outlet opening 7 opened and a leaking total gas flow 18 exits the mixing chamber 2 of the valve housing 1 , For example, a valve for exhaust gas recirculation valve 37 out.

Will the plunger 4 about a in 2 not shown Hubankerbauteil an actuator 5 actuated, the closing element moves 3 from the contact surface 20 of the valve housing 1 back to the mixing chamber 2 one. Because the edition 12 of the shut-off element 10 offset to its articulation 11 at the closing plate 3 above the ground 13 of the valve housing 1 is the shut-off element 10 during downward movement of plunger 4 and plate-shaped closing element 3 in her in 1.2 shown deflected position. This will do this on a side wall of the valve body 1 fastened return element 14 in his in 1.2 deflected situation transferred. Instead of designed as a tension spring return element 14 can the shut-off 10 on its opposite side also by a return element 14 be biased, which is designed as a compression spring.

Will the plate-shaped closing element 3 in his in 1.2 illustrated opening position 19 driven, they pass over the symmetrically arranged inlets 8th . 9 entering gas streams 16 . 17 essentially symmetrical in the mixing chamber 2 of the valve housing 1 one. According to the lifting movement of the closing element 3 occurs a total gas flow 18 at the opening 7 of the valve housing 1 in an in 1.2 not shown common line 38 (see. 4 ) out.

1.3 is the top view of the valve in its sealing position as shown in FIG 1.1 refer to.

The first inlet 8th and the second inlet 9 are symmetrical to each other on the valve body 1 , Inside the valve housing 1 is the area formed shut-off 10 in his in 1.1 illustrated sealing position 15 , The linkage 11 the flat trained shut-off 10 is located below the plate-shaped closing element 3 , The border of the plate-shaped closing element 3 engages under the contact surface 3 on the valve body 1 , Between the outer periphery of the plate-shaped closing element 3 and the peripheral surface of the outlet port voltage 7 turns one 1.3 Removable cover.

Advantageously, can be with the in the 1.1 . 1.2 such as 1.3 shown first embodiment of the present invention proposed valve 37 a transfer of pressure pulsations in the gas supply lines to the mixing chamber 2 about their inlets 8th . 9 can be transmitted through the sealing position 15 Asked flap-shaped, areal shut-off 10 prevent. Due to the symmetrical training 1 the valve housing can be a symmetrical removal of the gas streams 16 respectively. 17 from the inlets 8th . 9 , which are preferably arranged opposite one another, take place. The flat shut-off 10 fills the entire cross section of the valve body 1 and thus prevents being in one of the inlets 8th . 9 be transferred from the gas supply lines occurring pressure pulsations. A mixing of the two gas streams 16 respectively. 17 inside the mixing chamber 2 of the valve housing 1 of the valve 37 is by the inventive solution without additional sealing measures by the below the plate-shaped closing element 3 deflectable arranged shut-off 10 reached.

2.1 is a further embodiment of the valve with divided trained shut-off in sealing position refer.

From the illustration according to 2.1 shows that below the plate-shaped closing element 3 which over the pestle 4 through an actor 5 or actuator 6 is actuated, a first Absperrsegment 21 is articulated. The first shut-off segment 21 is at the linkage 11 pivotable on the underside of the closing element 3 taken and has another joint connection 23 on. At the connection joint 23 is a second shut-off segment 22 hinged, which in turn at another joint 24 on the floor surface 13 the mixing chamber 2 inside the valve body 1 is hinged. In the 2.1 in their sealing position 15 illustrated Absperrsegmente 21 respectively. 22 are about a here as a tension spring provided reset element 14 applied. Instead of in 2.1 shown, configured as a tension spring return element 14 can the two in 2.1 in their sealing position 15 illustrated flap segments 21 . 22 on the opposite side by a closure element designed as a compression spring 14 be pressed into their sealing position.

The reset element 14 is on a sidewall 25 of the valve housing 1 at a fortification 26 , in the 2.1 not shown in detail, added.

In the in 2.1 illustrated sealing position 15 is the top of the tellerfömig trained closing element 3 at the contact surface 20 of the valve housing 1 at. This is the outlet opening 7 of the valve housing 1 of the valve 37 locked. Also in the in 2.1 shown further second embodiment of the invention of the underlying idea to find the inlets 8th . 9 symmetrical to each other on the valve body 1 of the valve 37 , About the inlets 8th respectively. 9 the gas flows 16 . 17 symmetrical in the mixing chamber 2 one. In the sealing position 15 , in the 2.1 is shown, separate the hinged interconnected Absperrsegmente 21 respectively. 22 the inlets 8th . 9 such that the transmission of pressure pulsations between the inlets 8th . 9 is prevented. In the in 2.1 illustrated sealing position of Absperrsegmente 21 respectively. 22 they fill the entire cross section of the valve body 1 Thus, without the need for additional sealing measures, they prevent the transmission of pressure pulsations between the two into the valve housing 1 opening inlets 8th respectively. 9 ,

2.1 shows the second embodiment of the present invention proposed valve with trained trained shut-off in its open position.

Upon actuation of the actuator 5 moves the with the plate-shaped closing element 3 connected plungers 4 into the mixing chamber 2 of the valve housing 1 one. This will cause the outlet opening 7 of the valve housing 1 Approved. The removal of the gas streams 16 . 17 from the mixing chamber 2 takes place symmetrically, since a symmetrically extending enlargement or reduction of the gas passage of the gas streams 16 . 17 enabling cross sections by downward movement of the plate-shaped closing element 3 he follows. In the in 2.2 illustrated opening position 19 of the plate-shaped closing element 3 the gas streams flow 16 . 17 that is symmetrical about the valve body 1 arranged inlets 8th . 9 flow into this, as a leaving sum gas flow 18 from the valve body 1 out and enter an in 2.2 not shown common line 38 (see. 4 ) one.

A comparison of 2.1 and 2.2 shows that the pivotally received Absperrsegmente len according to this embodiment, a pivoting movement about their Anlenkstel len 11 . 23 and 24 perform, whereas the area formed shut-off 10 as shown in the 1.1 to 1.3 a linear movement along the floor 13 of the valve housing 1 performs.

3.1 is another, third embodiment of the valve with cylindrically trained Remove closing element in its sealing position.

The valve housing 1 of the valve 37 , which in the illustration according to 3.1 in its sealing position 15 is shown, is formed in contrast to the two embodiments shown above as a hollow cylinder. Inside the valve housing 1 there is a shut-off element 10 which as a cylinder 27 is trained. The cylinder 27 has a first end face 28 and a second end face 29 and is in a corresponding fit in the hollow cylindrical valve housing 1 admitted. At the first end 28 is the pestle 4 attached, which has a in 3.1 only schematically reproduced actuator 5 is operable. At the second end 29 of the cylindrically formed shut-off element is the return element 14 added. The first front page 28 acts with one on the valve body 1 below the outlet opening 7 provided contact surface 20 together. In the in 3.1 illustrated embodiment closes the peripheral surface of the cylindrically shaped shut-off 10 the inlets 8th respectively. 9 , By planting the first face 28 of the cylindrically formed shut-off element 10 at the contact surface 20 the hollow cylindrical valve housing 1 are the two inlets 8th and 9 against the outlet opening 7 sealed.

3.2 shows the valve according to the third embodiment with a cylindrically shaped closing element in the open position.

Upon actuation of the actuator 5 is that as a cylinder 27 trained shut-off 10 through the pestle 4 into the cavity of the valve body 1 against the action of the return element 14 pressed. In 3.2 is the reset element 14 shown in its compressed position. According to the above the actor 5 controllable return movement of the cylindrically formed shut-off 10 Be the on the valve body 1 opposite inlets 8th . 9 opened symmetrically to each other. According to the approved opening cross-section of the inlets 8th and 9 the gas flows 16 and 17 symmetrical in the interior of the valve housing 1 and leave this as escaping total mass flow 18 through the outlet opening 7 and enter an in 3.2 not shown common line 38 one. When the ram 4 actuating actuator 5 it may be a Hubankerbaugruppe or the like more.

5 is a fourth embodiment of the present invention proposed valve in its sealing position refer. According to the in 5 illustrated embodiment is located within the valve housing 1 a rotatably received, cylindrically shaped shut-off. In the in 5 illustrated sealing position 15 of the shut-off element 10 , seals its peripheral surface 43 the first inlet 8th and the second inlet 9 on the valve body 1 are trained from. Accordingly, in the sealing position 15 of the cylindrically shaped shut-off element 10 no gas flow, which is the cylindrically configured shut-off element 10 passing through passageway 42 to flow through. With reference number 44 the Verdrehsinn is characterized in which the cylindrically shaped shut-off 10 inside of the valve body 1 formed mixing chamber 2 is rotatable. The cylinder-shaped shut-off 10 passing through passage 42 stands with the outlet opening 7 on the valve body 1 in connection. In the in 5 illustrated sealing position 15 of the cylindrical configured shut-off 10 is the exit of a sum gas flow through the outlet opening 7 from the mixing chamber 2 of the valve housing 1 prevented.

6 is the fourth embodiment of the present invention proposed valve in its open position refer.

In contrast to the representation according to 5 is the cylindrically shaped shut-off 10 according to the direction of rotation 44 through an in 6 actuator not shown twisted. Im in 6 As shown, the first inlet is in alignment 8th and the second inlet 9 of the valve housing 1 with the cylindrical shut-off 10 passing through passageway 42 , One over the first inlet 8th incoming first gas stream 16 and a via the second inlet 9 of the valve housing 1 in the passageway 42 incoming second gas stream 17 flow through the passageway 42 and exit from these at the outlet opening 7 as a total gas flow 18 out. The total gas flow 18 flows from the outlet opening 7 in a common line 38 (compare illustration according to 4 ) the intake tract 40 the internal combustion engine 30 to. From the illustration according to 6 it turns out that in the open position 19 of the cylindrically shaped shut-off element 10 a first entrance opening 45 and a second entrance opening 46 of the passageway 42 each with the first inlet 8th and the second inlet 9 of the valve housing 1 aligned. By the rotational movement of the cylindrically shaped shut-off 10 in twisting direction 44 Ensures that the first inlet 8th or the second inlet 9 be released in an identical degree with respect to each other, so that identical gas flows 16 . 17 or identical partial gas streams 16 . 17 in the passageway 42 enter and a leaking total gas flow 18 adjusts the opening degree of the first inlet 8th or the second inlet 9 in the valve housing 1 equivalent.

4 shows a system overview of the present invention proposed exhaust gas recirculation using the inventively proposed valve.

The representation according to 4 is removable, that the valve 37 between a first supply line 35 and a second supply line 36 and a common line 38 is arranged. The valve 37 can both in the in the 1.1 to 1.3 shown first embodiment and in the 2.1 and 2.2 removable second embodiment as well as in the in 3.1 and 3.2 be designed illustrated third embodiment.

The exhaust side has an internal combustion engine 30 a number of exhaust manifolds 31 on, about which the exhaust gas of each cylinder 34 the internal combustion engine 30 is dissipated. Two each of the exhaust manifolds 31 can become exhaust banks 32 respectively. 33 be merged. Although in the illustration according to 4 a 4-cylinder internal combustion engine 30 is shown, it can just as well be a 5, 6, 8 or 12 cylinders containing internal combustion engine. The exhaust gas from the internal combustion engine exhaust side exhaust ducts exhaust gas 32 and 33 each have an exhaust gas extraction line 35 respectively. 36 on, via which an exhaust partial flow the exhaust banks 32 respectively. 33 can be removed. The exhaust gas removal lines are preferred 35 . 36 formed symmetrically to each other. The exhaust gas extraction lines 35 respectively. 36 lead to the inlets 8th respectively. 9 (see. 1.1 to 1.3 . 2.1 . 2.2 ; 3.1 . 3.2 ) in the valve body 1 of the valve 37 , The common management 38 over which of the valve housing 1 escaping total gas flow 18 the valve 37 in accordance with the control of a plate-shaped closure element 3 or designed as a slide member cylindrically configured shut-off 10 leaves is with the intake tract 40 connected. The common management 38 opens between an air guide device 39 and intake manifolds 41 on the intake side of the internal combustion engine 30 in the intake tract 40 , In the air guide device 39 it may be, for example, a throttle device, which may be an air mass sensor upstream or downstream.

About the joint leadership 38 gets out of the valve body 1 of the valve 37 escaping total gas flow 18 in the intake tract 40 the internal combustion engine 30 according to the opening position of the plate-shaped closing element 3 or the lifting movement of the cylindrically formed shut-off element 10 fed. Before given to the exhaust gas extraction lines 35 . 36 formed symmetrically, so that identical flow conditions for the exhaust gas extraction lines 35 respectively. 36 set by flowing exhaust gas streams.

Instead of in 4 illustrated 4-cylinder internal combustion engine 30 , each with two exhaust manifolds 31 to an exhaust bank 32 respectively. 33 3 or 4 exhaust manifolds can be used for 6- or 8-cylinder internal combustion engines 31 to a common exhaust bank 32 respectively. 33 be summarized. Alternatively to in 4 illustrated schematic view of the valve 37 , this could also be in a 90 ° rotated position between the exhaust gas extraction lines 35 . 36 and the common line 38 to the intake 40 to be ordered. This embodiment of an exhaust gas recirculation system is not shown in the drawing. About that in the valve housing 1 whose cross-section sealing surface-trained shut-off 10 or according to the embodiments in 1.1 to 1.3 respectively. 2.1 and 2.2 , the transmission of pressure pulsations between the exhaust gas extraction lines 35 and 36 be prevented. By a symmetrical as possible execution of the two exhaust gas extraction lines 35 respectively. 36 from the first exhaust bank 32 and the second exhaust bank 33 may be an occurrence of pressure pulsations in the design of the exhaust system of an internal combustion engine 30 be prevented.

1

valve housing

2

mixing chamber

3

Plate-shaped closing element

4

tappet

5

actuator

6

Steller

7

outlet

8th

1. inlet

9

Second inlet

10

shut-off

11

linkage

12

bearing surface

13

floor area

14

Return element

15

sealing position

16

1. gas flow

17

Second gas flow

18

leaking Total gas flow

19

open position

20

contact surface

21

1. Absperrsegment

22

Second Absperrsegment

23

connecting joint

24

additional joint

25

Side wall

26

attachment Return element

27

Cylindrical piston

28

1. front

29

Second front

30

Internal combustion engine

31

exhaust manifold

32

1. exhaust bank

33

Second exhaust bank

34

cylinder

35

1. Exhaust gas sampling line

36

Second Exhaust gas sampling line

37

Valve (AGR)

38

common management

39

Air guide device

40

intake system

41

intake manifold

42

Through channel

43

Peripheral area shut-off element 10

44

twisting

45

First inlet opening

46

Second inlet opening

Claims (17)

Valve ( 37 ) for controlling gas flows ( 16 . 17 ), which gives you a mixing chamber ( 2 ) forming valve housing ( 1 ) at inlets ( 8th . 9 ) and an outlet opening ( 7 ) of the mixing chamber ( 2 ) of one between an open position ( 19 ) in the direction of a sealing position ( 15 ) by means of an actuator ( 5 . 6 ) movable surface ( 3 . 28 ) is releasable or closable, wherein a total gas flow ( 18 ) through the outlet opening ( 7 ) exits and inlets ( 8th . 9 ) of the mixing chamber ( 2 ) via a shut-off element ( 10 ; 21 . 22 ; 27 ) are controllable together between an open and closed position. Valve according to claim 1, characterized in that the inlets ( 8th . 9 ) symmetrical to each other on the valve housing ( 1 ) are arranged. Valve according to claim 2, characterized in that the inlets ( 8th . 9 ) symmetrical to the direction of movement of the shut-off element ( 10 ; 21 . 22 ; 27 ) are arranged. Valve according to claim 1, characterized in that at the over the actuator ( 5 . 6 ) operable area ( 3 ) the shut-off element ( 10 ) whose surface is the cross section of the mixing chamber ( 2 ) in the sealing position ( 15 ). Valve according to claim 1, characterized in that the shut-off element ( 10 ; 21 . 22 ; 27 ) by a return element ( 14 ) is acted upon. Valve according to claim 4, characterized in that the shut-off element ( 10 ) articulated, pivotable shut-off segments ( 21 . 22 ) having. Valve according to claim 6, characterized in that a first shut-off segment ( 21 ) at the via the actuator ( 5 ) movable surface ( 3 ) and a second shut-off segment ( 22 ) on a surface ( 13 ) of the valve housing ( 1 ) are articulated. Valve according to claim 1, characterized in that the shut-off element ( 10 ) a piston mold ( 27 ) and a first end face ( 28 ) of the shut-off element ( 10 ) with a contact surface ( 20 ) below the outlet opening ( 7 ) of the valve housing ( 1 ) cooperates. Valve according to claim 8, characterized in that in the sealing position ( 15 ) of the shut-off element ( 10 ) in piston form ( 27 ) whose peripheral surface the inlets ( 8th . 9 ) separates from each other. Valve according to claim 1, characterized in that at the outlet opening ( 7 ) a common line ( 38 ) is connected via the one from the mixing chamber ( 2 ) leaving the total gas stream ( 18 ) an intake tract ( 40 ) of a multi-cylinder internal combustion engine ( 30 ) can be fed. Valve according to claim 1, characterized in that at the inlets ( 8th . 9 ) Gas extraction lines ( 35 . 36 ) are connected, via which a gas extraction from separate exhaust banks ( 32 . 33 ) of a multi-cylinder internal combustion engine ( 30 ) he follows. Valve according to claim 11, characterized in that the gas extraction lines ( 35 . 36 ) to the valve housing ( 1 ) are executed running symmetrically to each other. Valve according to claim 10, characterized in that the common line ( 38 ) in the intake tract ( 40 ) between an air guiding device ( 39 ) and suction lines ( 41 ) of cylinders ( 34 ) of the multi-cylinder internal combustion engine ( 30 ) opens. Valve according to claim 8, characterized in that the shut-off element ( 10 ) is cylindrical and one the shut-off ( 10 ) passing through channel ( 42 ), whose inlet openings ( 45 . 46 ) on its peripheral surface ( 43 ). Valve according to claim 14, characterized in that the passageway ( 42 ) in the horizontal direction through the shut-off element ( 10 ) extends in a cylindrical shape. Valve according to claim 14, characterized in that the shut-off element ( 10 ) in cylindrical form within the mixing chamber ( 2 ) is rotatable about its vertical axis. Valve according to claim 14, characterized in that the outlet opening ( 7 ) of the valve housing ( 1 ) with the passageway ( 42 ) of the shut-off element ( 10 ) is in flow communication in cylindrical form.