WO2004027269A2

WO2004027269A2 - Fluid system control valve and system comprising said valve

Info

Publication number: WO2004027269A2
Application number: PCT/FR2003/002761
Authority: WO
Inventors: Carlos Martins
Original assignee: Valeo Thermique Moteur
Priority date: 2002-09-18
Filing date: 2003-09-18
Publication date: 2004-04-01
Also published as: AU2003276358A8; WO2004027269A3; US20060118066A1; FR2844571B1; AU2003276358A1; FR2844571A1; EP1552196A2; JP2006512540A

Abstract

The invention relates to a control valve for a fluid circulation system, consisting of a body (2) comprising a cylindrical lateral wall (4) which defines a cylindrical housing. The invention also comprises tubes (50, 52, 60, 62, 58) through which the fluid enters and leaves the aforementioned body (2). A rotary adjustment element (80) is mounted to rotate around an axis (XX) in the body (2) and can occupy different positions in order to control the circulation of the fluid between the tubes. All of said tubes pass through the cylindrical lateral wall (4) of the body (2).

Description

Control valve for a fluid circuit and circuit comprising this valve

The invention relates to the field of multi-way valves for a fluid circuit, in particular for a cooling circuit of a thermal engine of a motor vehicle. It also relates to a fluid circulation circuit, in particular a motor vehicle thermal engine cooling circuit comprising this valve.

More specifically, the invention relates to a control valve for a fluid circulation circuit, comprising a body comprising a cylindrical side wall delimiting a cylindrical housing, at least two pipes for the entry or exit of the fluid in the body, a rotary adjusting member mounted to rotate in the cylindrical housing of the body about an axis, this adjusting member being able to assume different angular positions to control the circulation of fluid between the pipes.

Valves of this type are already known having a body comprising a bottom wall into which opens a fluid inlet and a cylindrical side wall into which open fluid outlets at axial heights and in angular positions chosen relative to the axis of rotation of an adjustment member capable of rotating about an axis of rotation.

A valve of this type has many drawbacks. Its size is important. Furthermore, it does not make it possible to connect a large number of circulation paths for the fluid.

The present invention specifically relates to a control valve for a fluid circulation circuit which overcomes these drawbacks. These objects are achieved in accordance with the invention by the fact that all the pipes open into the cylindrical side wall of the body.

Thanks to this characteristic, the space requirement, in particular the axial space requirement of the valve, is reduced. On the other hand, it is possible to connect a large number of channels to the cylindrical periphery. Thus, a control valve according to the invention can replace several valves of the prior art. For example, two four-way valves.

In a preferred embodiment, the pipes are arranged radially relative to the cylindrical side wall.

This arrangement further increases the number of possible ways of the valve.

Tubing can be distributed on one level.

However, in a particular embodiment, the tubes are distributed over several levels.

Thus, the tubes can be distributed over two, three or more levels. This embodiment is particularly suited to the case where the valve must include a large number of channels, for example six or more than six. Thus, it is possible to keep a small diametral size of the valve, in conjunction with a small axial size.

Furthermore, the invention relates to a fluid circulation circuit, in particular a cooling circuit of a thermal engine of a motor vehicle. Such a circuit is traversed by a cooling fluid which circulates in a closed circuit under the action of a circulation pump. Such a cooling circuit comprises several branches, including one branch which contains a radiator for cooling the engine, a branch which constitutes a derivation of the engine cooling radiator and a branch which contains a radiator, also called an air heater, used for heating the passenger compartment of the vehicle.

The invention relates to a fluid circuit comprising a control valve according to the invention, the pipes of which are connected to the various branches of the circuit. According to a particular embodiment, the circuit is produced in the form of a high temperature circuit for cooling a heat engine of a motor vehicle comprising a main pump for circulating the fluid, a short-circuit pipe and a heating pipe. comprising an air heater, a low temperature circuit comprising a low temperature pump, a heat exchange module consisting of a high temperature heat exchange section permanently integrated into the high temperature cooling circuit, a low temperature heat exchange section permanently integrated into the low temperature cooling circuit, of an attributable section which can be integrated either into the high temperature heat exchange circuit or into the heat exchange circuit at low temperature, the control valve being connected to the heat exchange module, to the high temperature circuit ture and to the low temperature circuit so as to integrate the heat exchange section attributable either to the high temperature circuit or to the low temperature circuit, depending on an engine operating parameter.

Other additional and / or alternative characteristics of the invention are listed below:

- The rotary adjustment member comprises pockets capable of placing two or more of two tubes in communication with one another;

- the valve has a cylindrical sealing ring arranged between the cylindrical side wall of the body and the rotary adjusting member;

- The rotary adjustment member has a convex curved shape and the sealing ring has a concave curved shape complementary to that of the rotary adjustment member; the ring includes a stop means which makes it possible to immobilize it in rotation relative to the valve body;

- The stop means is a protuberance which fits into a corresponding housing formed in the body; - A seal, in particular an O-ring, is provided around at least one pocket of the rotary member in order to insulate the fluid circuits between them;

- the valve has seven pipes distributed over two levels;

- one of the levels has three tubes, while the other level has four tubes;

- the rotary member has three pockets;

- The rotary member further comprises a through channel.

In particular, the valve according to the invention will have two stages, each comprising three channels, and a rotary member having pockets making it possible to place said channels in communication two by two, as a function of its angular position. All or part of said pockets will be oriented substantially parallel to the axis of rotation of said rotary member and / or will be inclined relative to the latter so as to be able to connect the channels of two different stages. According to this embodiment, a six-way valve is obtained whose space requirement, both radial and axial, is particularly advantageous.

Other characteristics and advantages of the present invention will appear on reading the following description of exemplary embodiments given by way of illustration with reference to the appended figures. In these figures:

Figure 1 is a perspective view of a valve control according to the present invention; Figure 2 is an exploded view of the valve shown in Figure 1; Figure 3 is a sectional view of the valve shown in Figures 1 and 2; Figure 4 is a sectional view along line IV-IV of the valve shown in Figure 3; Figure 5 is an external view of a second embodiment of a valve according to the present invention comprising pipes distributed on two levels; Figure 6 is a left view of the valve shown in Figure 5; Figure 7 is a rear view of the valve shown in Figure 5; Figures 8 and 9 show two perspective views of the valve of Figures 5 to 7; Figure 10 is an exploded view of the valve shown in Figures 5 to 9; Figure 11 is a sectional view along line XI -XI of the

Figure 6; Figure 12 is a view of a cooling circuit of a thermal engine of a motor vehicle comprising two four-way valves; Figure 13 is a view of the cooling circuit shown in Figure 12, in another operating configuration; Figure 14 is a view of a cooling circuit of a thermal engine of a motor vehicle comprising a control valve according to the present invention, shown in the same configuration as the circuit of Figure 12; Figure 15 is a view of the cooling circuit of the

Figure 14, shown in the same configuration as the cooling circuit of Figure 13; Figure 16 is a sectional view along line XVI -XVI of Figure 6, in a configuration corresponding to Figure 14; and Figure 17 is a sectional view of the two-control valve of the invention identical to Figure

16, shown in the configuration corresponding to the circuit of Figure 15.

There is shown in Figures 1 to 4 a first embodiment of a control valve according to the invention. The valve comprises a body designated by the general reference 2, consisting of a cylindrical side wall 4 and a bottom 6

(Figure 4). The body 2 is of general shape of revolution around an axis XX. The body 2 comprises six pipes 8 which open radially into a cylindrical housing 10 with an axis

XX (Figure 2). In the embodiment shown, the axes

12 of the pipes 8 are coplanar (Figure 3). In addition, the tubes are regularly distributed at 60 ° from one another at the periphery of the lateral cylindrical wall 4. These characteristics are not imperative and the tubes 8 may not be coplanar, or else they may not be regularly distributed around the periphery of the lateral cylindrical wall 4. However, in accordance with an important characteristic of the invention, the set of tubes 8 opens onto the cylindrical wall 4. None of them is located on the wall bottom 6 (Figure 4).

Inside the cylindrical housing 10, is housed a rotary adjusting member 14 whose diameter corresponds substantially to the internal diameter of the cylindrical housing 10 (Figures 2 to 4). The adjusting member 14 is extended by a rod 16 directed along the axis XX. This rod 16 passes through a central opening that has a cover 18 of circular shape which is screwed onto a flange 20 of the body 2 of the control valve by means of fixing screws 22 with interposition of a seal d '' O-ring 24 (see Figure 2). The rotary adjusting member 14 is adapted to be driven in rotation about the axis XX by motorization means (not shown) which may be constituted, for example, by a motor of the stepping type capable of bringing l 'rotary member 14 in a multiplicity of different positions, either in successive increments, or continuously.

The rotary member 14 has pockets 26, three in the example shown, capable of putting the pipes 8 in communication with one another. These pockets are formed by recesses made in the rotary member 14 and opening at the periphery of the latter. Thus, as can be seen in Figure 3, the tubes 8 are distributed in pairs. They communicate with each other via the pockets 26. Thus, one of the tubes of each pair can constitute an inlet for the fluid, while the other tubing of the pair constitutes an outlet for this fluid . By rotating the rotary member at an angle of 60 ° in one direction or the other, two different adjacent tubes can be brought into communication.

A sealing ring 30 is interposed between the rotary member 14 and the lateral cylindrical wall 4 of the body 2 (Figure 2). Advantageously, the rotary member 14 has a convex curved shape and the sealing ring 30 has a concave curved shape complementary to that of the rotary member 14. There is thus a self-centering of the rotary member 14 relative to the body. 2 of the valve. Self - centering allows the valve to be placed in the desired angular position. This solution also has the advantage of reducing the friction surfaces to the minimum required for sealing, thus limiting the operating forces. No part of the rotary member 14 is in contact with the body 2. The sealing ring 30 (Figure 2) has circular openings 32 corresponding to the inlet or outlet of the pipes 8, six in the example represented. The openings 32 are provided with lip seals to ensure a seal between the ring 30 and the body 2. In addition, the sealing ring 30 has an opening 34 in a non-functional part to facilitate its mounting on the rotary member 14 as well as its release. The sealing ring 30 also has a protuberance 36 (Figure 2) which is housed in a housing (not shown) of the body 2 of the valve in order to prevent the rotation of the sealing ring 30 relative to the body.

There is shown in Figures 5 to 11 a second embodiment of a control valve according to the present invention. This valve differs from that which has been described previously by the fact that the inlet or outlet pipes are distributed over several levels, two in the example shown.

As for the first embodiment, the valve has a cylindrical body 2 limited by a bottom wall 6 and a cylindrical side wall 4 of axis XX. The cylindrical side wall 4 delimits a cylindrical housing 10. The housing is closed by a cover 18 which is fixed by screws 32 (four in the example shown) which fix the cover 18 on a flange or flange 20 forming part of the body 2 A seal, for example an O-ring 24, is interposed between the cover 18 and the flange 20.

The body 2 comprises seven tubes all arranged, in accordance with an important characteristic of the invention, on the cylindrical side wall 4. In this embodiment, the tubes are distributed on two levels, namely a first level which will be called the lower level because it is closest to the bottom 6 of the body, and a second level which will be called the upper level because it is closest to the opening of the body 2 and the cover 18. Four tubes were placed on the first level. In the figures, these pipes bear the references 50, 52, 54 and 56 respectively. Three pipes have been arranged on the second or upper level. In the figures, these pipes have been designated by the references 58, 60 and 62 respectively.

Tubing 50 and 58 are associated with each other. The tubing 50 is part of the lower level, while the tubing 58 is part of the upper level. These two pipes therefore allow communication between the lower level and the upper level. In addition, the pipes 60 and 62, which both belong to the upper level, are also matched to each other.

A rotary member, generally designated by the general reference 80 (Figures 10 and 11), is disposed inside the cylindrical housing 10 of the body 2. It is mounted rotating around the longitudinal axis XX of the body 2. L organ 80 comprises a solid body 82 of generally cylindrical shape with axis XX. The body 82 is extended by a rod 26 directed along the axis XX which passes through a central opening 27 which comprises the cover 18. An O-ring seal 17 (see Figure 10) is interposed between the rod 26 and the opening 27. As described above, the rotary member 80 is capable of being driven in rotation about the axis XX by means of motorization not shown, capable of bringing it into a multiplicity of different angular positions, either by successive increments, either continuously.

Three pockets are formed inside the cylindrical body 82. These pockets are designated by the references 84, 86 and 88. The pocket 84 extends over the two levels and is able to put the pipes 50 and 58 l in communication. with each other. It is also able to communicate with the tubing 52. The pocket 86 also extends over two levels. It has substantially an L shape. It is able to connect the pipes 54 and 62 (see Figure 14), as well as the pipes 54 and 56 (see Figure 15).

The third pocket 88 is located only at the upper level of the body of the rotary member 80, it is able to connect the pipes 60 and 62 (see Figure 15).

Finally, the rotary adjustment member 80 comprises a through channel 90 which, in the example shown, crosses it diametrically. The channel 90 is intended to switch part of one of the circuits into another (see Figures 14 and 15). It is located at the lower level of the rotary member 80.

A sealing ring, generally designated by the reference 100, is interposed between the rotary member 80 and the cylindrical wall 4 of the body 2. Openings, the shape and number of which correspond to the number of pockets formed in the rotary adjusting member 80, are provided in the sealing ring 100 (Figure 10). Since the rotary member has three pockets, the sealing ring also has three openings adapted to each of these pockets. These openings have been designated by the references 102, 104 and 106. The opening 102 corresponds to the pocket 84, the opening 104 to the pocket 86 and the opening 106 to the pocket 88. In addition, two circular openings 110 corresponding at the two ends of the channel 90 have been provided in the sealing ring 100.

Sealing means are provided around the periphery of each of the previously described openings. These sealing means could be constituted, for example, by lips. However, in the example shown, they consist of O-rings, such as the seal 112 (Figure 10). There is shown in Figures 12 and 13 a fluid circulation circuit. This circuit consists, on the one hand, of a high temperature cooling circuit 120 of a heat engine 121 of a motor vehicle and, on the other hand, of a low temperature cooling circuit 122 intended for the cooling of equipment 124 of the motor vehicle, for example a charge air cooler or a condenser forming part of the air conditioning circuit of the passenger compartment of the motor vehicle.

The high temperature cooling circuit 121 is traversed by the engine coolant 121 circulated by a main high temperature circulation pump 126, the fluid heated by the engine leaves the latter via an outlet 128 which is connected to the inlet of a three-way valve 130. The valve 130 comprises three pipes which are connected to three branches of the high temperature cooling circuit, namely a branch 132 which comprises a high temperature cooling radiator which will be described later, a branch 134 which forms a bypass of the cooling radiator and a branch 136 which comprises an air heater 138 used for heating the passenger compartment of the vehicle.

The valve 130 makes it possible to manage the flow rates of fluid in the abovementioned branches in order to optimize the temperature of the heat engine and the heating of the passenger compartment. When the engine is cold started, it makes it possible to circulate the fluid in the branch branch 134 without passing through the radiator. During this start-up phase, it is possible to pass all or part of the fluid flow through the air heater 138 if heating of the passenger compartment is desired. When the temperature of the fluid has reached or exceeded a given threshold, the fluid passes through the high temperature cooling radiator. The low-temperature cooling circuit 122 consists of a loop in which the fluid is circulated by a low-temperature pump 140. It passes through a heat exchanger 124, mentioned previously, for example a charge air cooler or a condenser forming part of an air conditioning circuit in the passenger compartment of the motor vehicle. It is then cooled in a low temperature exchanger 142. The fluid circulation circuit of Figures 12 and 13 comprises a heat exchange module consisting of two rows of heat exchange tubes.

The first of these rows constitutes the low-temperature cooling radiator 142 mentioned above. This row of tubes is permanently integrated into the low-temperature cooling circuit 122. The production of the second row of tubes is more particular in that the second row of tubes is divided into two parts, namely a part 144 constituting a section high-temperature heat exchange used for cooling the high-temperature circuit 120, and in particular the heat engine 121. The section 144 is permanently integrated into the high-temperature cooling circuit 120.

Furthermore, the second row of tubes of the heat exchange module comprises an assignable heat exchange section 146. This attributable section can be integrated either into the high temperature cooling circuit 120 or into the low temperature cooling circuit 122. Below a certain value of the coolant temperature, for example 105 ° C, the assignable heat exchange section 146 is part of the low temperature coolant circuit. This increases the cooling capacity of this circuit, which allows an improvement in its efficiency, for example an improvement in the efficiency of the air conditioning circuit. If the temperature of the engine coolant increases above the critical value, it is necessary to increase the cooling capacity of the heat engine 121. This is why the attributable heat exchange section 146 is then integrated into the high temperature cooling circuit, as shown in Figure 13. For this purpose, the fluid circulation circuit comprises two four-way valves 150.

As can be seen in Figure 12, the two four-way valves 150 are connected in such a way that the attributable heat exchange section is crossed by the coolant which circulates in the loop 122 before it enters the row heat exchange 142 constituting a heat exchange at low temperature. The heat exchange surface thus consists of the sum of the attributable section 146 and the row of tubes 142.

In contrast, in the configuration of Figure 13, which corresponds to operation above a critical temperature of the coolant, the four-way valves 150 are oriented so that the fluid in the low temperature coolant circuit 122 passes through a bypass line 152, avoiding the attributable heat exchange section 146. In addition, the four-way valves 150 make it possible to direct part of the coolant from the high temperature circuit 120 to the exchange section 146 by a branch 154, as shown by the arrow 156. Thus, the high temperature section 144 and the attributable heat exchange section 146 are mounted in parallel and their cooling capacities are added to cool the thermal engine of the motor vehicle 121.

However, as can be seen, in this embodiment, two valves 150 are necessary to ensure the interconnection of the high temperature circuit 120 and low temperature circuit 122. This results in additional cost and complexity, as well as an increase in size. The control valve of the invention is particularly advantageous in an application of this type because it makes it possible to replace the two four-way valves 150 with a single valve, which results in a reduction both in cost and in 1 congestion.

There is shown in Figures 14 and 15 a fluid circulation circuit consisting of a high temperature cooling circuit 120 and a low temperature cooling circuit 122 similar to the circuits shown in Figures 12 and 13, in which the two four-way valves 150 have been replaced by a single control valve according to the present invention.

In Figures 12 to 15, the identical parts of the fluid circulation circuit have the same references.

The control valve of the invention conforms to the embodiment which has been described above with reference to Figures 5 to 11. Consequently, the pipes of this valve are distributed on two levels, namely a lower level designated by the reference 160 and a higher level designated by the reference 162 (Figures 14 and 15). For the sake of clarity of the drawing, levels 160 and 162 have been shown separated from each other. It should be understood that this is a schematic representation. In reality, these two levels are arranged one above the other, as explained in the preceding description of this embodiment of the valve of the invention.

Figure 14 corresponds to the configuration of the circuit shown in Figure 12, i.e. a configuration in which the temperature of the engine coolant thermal is less than a critical value, for example 105 ° C. In this configuration, the high temperature cooling radiator consists only of the high temperature heat exchange section 144 forming part of the second row of heat exchange tubes of the heat exchange module described above. Therefore, the assignable heat exchange section 146, which completes the second row of tubes of the heat exchange module, is part of the low temperature cooling circuit 122.

The three-way thermostatic valve 130 is oriented in such a way that the cooling fluid is directed towards the branch 132 (arrow 133), towards the tube 50 forming part of the lower level 160 of the control valve of the invention. The cooling fluid passes from the lower level 160 to the upper level 162 through the pocket 84 which, as explained above, allows these two levels to be placed in communication with one another. The fluid leaves through the tube 58, which then constitutes an outlet tube, to be directed by the line 170 (arrow 172) to the high-temperature heat exchange section 144. After being cooled, the fluid conventionally returns to the motor 121 and the circulation of the fluid repeats.

As regards the low temperature cooling circuit 122, the cooling fluid driven by the low temperature circulation pump 140 passes through the heat exchanger 124, for example an air conditioning circuit condenser, and enters via the pipe 56, which then constitutes an inlet pipe, in the lower level 160 of the control valve of the invention. The fluid passes through the rotary member 80 thanks to the through channel 90 and opens into the tubing 52 forming an outlet tubing, as shown schematically by the arrow 174. The fluid then enters the attributable heat exchange section 146, as shown in the arrow 176, then, after having passed through this heat exchange section, enters the upper level 162 of the control valve via the pipe 62 .

In this configuration of the cooling circuit, the rotary member 80 is angularly oriented in such a way that the pocket 86 is opposite the inlet pipe 62. As explained above, the pocket 86 makes it possible to pass the fluid from one level to another, in this case from the upper level 162 to the lower level 160. The fluid therefore exits through the tube 54 which constitutes an outlet tube, as shown schematically by the arrows 178, to enter the 'low temperature heat exchanger 142, more precisely in the row of tubes of the heat exchange module which constitutes the low temperature cooling radiator always forming part of the circuit 122. The fluid then repeats the same circuit. As can be seen, in the manner described with reference to FIG. 12, the bundle of tubes 142 and the attributable heat exchange section 146 are thus mounted in series and successively traversed by the coolant at low temperature. Their cooling capacities add up.

Figure 16 is a sectional view of the control valve of the invention shown in an angular position of the rotary member 80 corresponding to Figure 14. In Figure 16, we can see (arrow 180) how the pocket 84 connects the tubing 50 and the tubing 52.

FIG. 15 shows the cooling circuit of FIG. 14 in a configuration in which the temperature of the cooling fluid is higher than the critical temperature defined above, for example 105 °. In this configuration, it is necessary to cool more energetically the heat engine 121 of the motor vehicle. For this purpose, it is necessary to transfer the attributable cooling capacity 146 from the low temperature cooling circuit 122 to the high temperature cooling circuit 120.

The three-way thermostatic valve 130 is oriented in such a way that the fluid circulates through the branch 132 (arrow 133) towards the inlet pipe (50) forming part of the lower level (160) of the control valve of the invention . However, in this configuration, the angular orientation of the adjustment member 80 is different. It is always the pocket 84 which is located opposite the pipes 50 and 58. However, in this configuration, the pocket 84 communicates the inlet pipe 50 simultaneously with the pipes 58 and 54. There is therefore a pipe inlet, namely the tubing 50, and two outlet tubing, namely the tubing 54 and 56. In this example, the tubing is not put in communication in pairs only, but one tubing is put simultaneously in communication with two different tubes.

In other exemplary embodiments, a reverse situation could be found in which several inlet pipes would be placed in communication with a single outlet pipe. Generally, a pocket of the rotary member 80 can put an inlet tube in communication with two or more of two outlet tubes. As a result, the coolant emerges from the upper level 162 through the outlet manifold 58 to pass through the high temperature heat exchange section 144, as previously described. But, in addition, part of the cooling fluid leaves through the outlet pipe 52 to pass through the attributable heat exchange section 146 which is thus placed in parallel with the high temperature heat exchange section 144. This circulation exactly matches the situation which has been described with reference to Figure 13. Thus, as we have said, the cooling capacities 144 and 146 put in parallel with each other add up, which makes it possible to cool more vigorously the engine.

As regards the low temperature cooling circuit 122, the cooling fluid circulated by the low temperature circulation pump 140 passes through the heat exchanger 124, then enters via the inlet pipe 56 in the lower level 160 of the control valve in the angular orientation of the rotary member 80 shown in Figure 15, the pocket 86 communicates the tubing 56 with the tubing 54, so that the fluid enters (arrows 178) in the section low temperature heat exchange (142) of the heat exchange module of the fluid circuit.

FIG. 17 represents a sectional view of the control valve in the angular orientation of the rotary member 80 corresponding to FIG. 15.

After passing through the attributable heat exchange section, the fluid enters the valve through the inlet pipe 62 located in the upper level 162, then into the pocket 88 of the member 80 and exits through the pipe 60 constituting a outlet pipe, before returning, in a conventional manner, to the high-temperature circulation pump 126 to pass again through the heat engine 121 of the vehicle. The same circulation of the fluid is then repeated.

The valve of the invention is susceptible of numerous variant embodiments and its application is not limited to a fluid circuit of the type described above.

Claims

claims

1. Control valve, for a fluid circulation circuit, comprising a body (2) comprising a cylindrical side wall (4) delimiting a cylindrical housing (10), at least two pipes (8, 50-62) for the inlet or outlet of the fluid in the body (2), a rotary member (14, 80) of adjustment mounted rotating about an axis (XX) in the cylindrical housing (10) of the body (2), this rotary member ( 14, 80) being able to take different angular positions to control the circulation of the fluid between the pipes, characterized in that all the pipes open into the cylindrical side wall (4).

2. Valve according to claim 1, characterized in that the pipes are arranged radially relative to the cylindrical wall (4).

3. Valve according to one of claims 1 or 2, characterized in that the pipes are distributed on one level.

4. Valve according to one of claims 1 or 2, characterized in that the tubes are distributed on several levels (160, 162).

5. Valve according to one of claims 1 to 4, characterized in that the rotary member (14, 80) for adjustment comprises pockets (26, 84, 86, 88) capable of putting two or more of two pipes in communication with each other.

6. Valve according to one of claims 1 to 5, characterized in that it comprises a sealing ring (30, 100) disposed between the cylindrical side wall (4) of the body and the rotary member (14, 80 ).

7. Valve according to claim 6, characterized in that the rotary member (14, 80) has a convex curved shape and in that the sealing ring (30, 100) has a concave curved shape complementary to that of the rotary member (14, 80).

8. Valve according to claim 6 or 7, characterized in that the sealing ring (30, 100) comprises a stop means

(36) which makes it possible to immobilize in rotation relative to the body

(2).

9. Valve according to claim 8, characterized in that the stop means is constituted by a protuberance (36) which fits in a corresponding housing of the body (2).

10. Valve according to one of claims 1 to 9, characterized in that a seal (112), in particular an O-ring seal, is provided around at least one pocket of the rotary member ( 14, 80) in order to insulate the circuits from each other.

11. Valve according to one of claims 1 to 10, characterized in that it comprises seven pipes (50, 52, 54, 56, 58, 60 and 62) distributed over two levels (160, 162).

12. Valve according to claim 11, characterized in that one of the levels (160) has four pipes (50, 52, 54, 56), while the other level (162) has three pipes (58, 60, 62).

13. Valve according to one of claims 11 or 12, characterized in that the rotary member (80) has three pockets (84, 86, 88).

14. Valve according to one of claims 11 to 13, characterized in that the rotary member (80) further comprises a through channel (90).

15. Fluid circuit, characterized in that it comprises a control valve according to one of claims 1 to 14, the tubes of which are connected to different branches of this circuit.

16. The circuit as claimed in claim 15, characterized in that it is produced in the form of a high temperature cooling circuit (160) for an engine (121) of a motor vehicle, comprising a high temperature pump (126) , a short circuit pipe (134) and a heating pipe (136) comprising an air heater (138), a low temperature cooling circuit (122) comprising a low temperature pump (122), an exchange module heat consisting of a high temperature heat exchange section (144) permanently integrated into the high temperature cooling circuit (120), a low temperature heat exchange section (142) permanently integrated to the low temperature cooling system

(122), of an assignable section (146) which can be integrated either into the high temperature heat exchange circuit (120) or into the low temperature heat exchange circuit (122), the valve being connected the heat exchange module and the high temperature cooling circuit (120) and the low temperature cooling circuit (122), so as to integrate the heat exchange surface attributable either to the high temperature circuit (120 ), or to the low temperature circuit (122), as a function of an operating parameter of the engine (121) of the motor vehicle.