FR2496173A3 - APPARATUS FOR CONTROLLING THE EXHAUST GAS RECYCLING OF INTERNAL COMBUSTION ENGINES - Google Patents

Abstract

THIS EXHAUST GAS RECYCLING APPARATUS OF INTERNAL COMBUSTION ENGINES HAS A VALVE 8 INSTALLED IN THE RECYCLING LINE 6. IN THIS VALVE TWO MEMBRANES 18, 20 DELIMITENT BETWEEN THEM A PRESSURE CHAMBER 19 INSULATED FROM THE ATMOSPHERE AND CONNECTED TO THE TUBE OF SUCTION OF THE ENGINE. TWO SPRINGS 31, 32 OPPOSE A REDUCTION OF VOLUME OF THIS ROOM. MOVING THE MEMBRANE 18 CONTROLS THE CONICAL VALVE 11 THAT CLOSES OR OPENS THE RECYCLING DRIVE MORE OR LESS 6. WITH THIS VALVE, IT IS NOT RECYCLED BY EXHAUST GASES WHEN THE MOTOR TURNS ON TO A SYSTEM CLOSE TO SLOW MOTION, EITHER AT FULL POWER.

Description

The present invention relates to a control apparatus of the

  recycling of the exhaust gases of an internal combustion engine compressing a mixture of air and fuel and comprising a device for forming this mixture equipped with a throttle member that can be operated at will, a line for recycling the gas being interposed between the exhaust pipe and the suction pipe so as to bypass the combustion chambers of the engine, this recycling pipe comprising an exhaust gas recirculation valve with a pneumatic coimmanda system which is subjected to pressure

  of the downstream suction system of the foreign

  which controls the said valve so that when the engine is running at a speed close to idle, no exhaust gas is returned to the suction system, in proportion to the increase in the power supplied. by the engine it is returned in the suction system more exhaust, and

  - at full engine power it is not

  exhaust gas in the suction system.

  Control gear of this kind serves to reduce the amount of different harmful constituents contained in the exhaust gases (for example the

  nitric oxides and by recycling also in

  carbon monoxide and hydrocarbons) that form during combustion of the mixture in the engine. several exhaust gas recyling devices have, as we know, already been proposed and

even used in vehicles.

  It is for example described in the application for

  DE-A-1,1,464 an internal combustion engine

-2 -

  dull with exhaust gas recirculation

  carries a pipe reeyclage of these gases arranged

  between the exhaust pipe and the vacuum system

  and bypassing the combustion chambers, this rewinding pipe including a recycle valve dornt the pneumatic control system, which compares the pressure prevailing in the intake pipe of the engine downstream of the d constriction of the mixture forming device at a pressure which is detrimental to the position of the fortran

  in such a way that this vital remains.

  when the engine is running

  when it turns into a partial load infer-

  ee and -1u ele / A'er under full load or under full load. When the throttle member is constituted by a flap or throttle, the pressure which prevails in the field of the edge of this throttle in idle position, so in almost closed position, is transmitted to the control system of the recycling valve. exhaust through a household control bore in this part of

suction tubing.

  This control system, however, has some disadvantages that may have repercussions

  on recycling and on the proper operation of the engine.

  It is a question of the watertightness of both chambers

  pressure of the pneumatic control system,

  which is difficult to ensure and which, in use, can lead to breakdowns, on the other hand the insufficient life of the membrane directly subjected to the action of very hot exhaust gases, which can iv ' This may cause the engine to shut down or malfunction of the engine, as the suction line is vented to the atmosphere.

  3.5 in its downstream part of the throttle.

  This is why another known exhaust-gas recirculation apparatus includes a control system.

  valve which, between the throttle control chamber

  exhaust chamber and the pressure chamber subjected to the suction pressure, further comprises a chamber

  3 connected to the atmosphere to prevent the gases from

  very hot exhaust are not in contact with the

  membrane. In this type of apparatus it is necessary, however,

  to predict a second control line for the supply of the pressure of the suction pipe, which is a source of expense and a risk of confusion

  during assembly and, later, maintenance work.

  The control bore in the field of the throttle closed position must be executed with the most

  high precision because its position in relation to the

  pifln determines the start-up or shutdown of the exhaust gas recirculation. This bore can not

  so be executed quickly and is therefore expensive.

  The problem to which the invention brought a solution

  lution was then to design an exhaust gas recirculation equipment capable of ensuring a recycling corresponding to the needs of the engine so

  that it emits only a few harmful and

  economically. Such apparatus

  In addition, it should be inexpensive to manufacture, not to

  have control bore in the field of the or-

  throttling and can be controlled by a

only pressure chamber.

  The solution according to the invention is characterized

  due to the fact that the exhaust gas recirculation valve which has a cooperating conical flap

  with a valve seat has two membranes available

  one behind the other, having effective surfaces

  different lenses, and whose faces

  each other delimit and isolate the atmosphere.

  a pressure chamber connected to the tubing

  suction through a control line

  - 4 - the membrane with the smallest surface

  effective being, by means of two plateaux of mem-

  brane, associated with a conical valve stem, a spring whose force opposes a reduction in volume of the pressure chamber being applied against one of these two trays and supported by its opposite end to this plate and- by means of a spring cup, against a socket which is arranged with the possibility of axial displacement in an axis to which is fixed, by means of two plates, the membrane which has the largest effective surface, a spring taking support on the one hand against one of these trays on the other hand in the pressure chamber, the force of this spring opposing a reduction of volume of this chamber. In the valve

  so conceived it is advantageous for the length to be

  the height of the spring which bears on the membrane having the smallest effective surface is adjustable by displacement of the sleeve in the axis of the other membrane when the conical-flapet touches its seat and when one of the trays of this other membrane touching a cover of the valve body, and that the installed length of the spring of the diaphragm having the largest surface is adjustable by moving a set screw disposed in said sleeve, this setting being made from the position in which one of the plates of the membrane having the smallest effective surface is in contact with the body of the pressinn chamber while the said

  adjusting screw touches the end of the stem of

pet opposite the conical flap.

  The advantages of the exhaust gas recirculation apparatus designed according to the invention is that on the one hand the apparatus depends only on a single pilot quantity, namely the pressure which

  reigns in the suction tubing downstream of the

  throttling, this pressure being understood

  between a minimum value and a maximum value

  spaced apart from one another, in conjunction with a cone shaped damper designed accordingly, to ensure the flow rate of the recycled exhaust gas which is necessary for the engine to be smaller than the amount minirmum the production of gases from the other side of the flue and the enselne d; The control system of this system has a structure of simple construction, since the operating system of the

  valve no longer receives the pressure of the tubing of

  similarity in function of the position of the

butterfly.

  In addition, the manufacture of the exhaust gas recirculation valve is considerably simplified due to the suppression of the second chamber of

  pressure, and the valve is less prone to disturbance.

  Moreover, because the valve sdon the invention

  Only one control fitting is used, any connection error during assembly of the valve or during its maintenance is excluded, the possibility of adjustment of the installed length of the springs allows the manufacturing tolerances.

  the largest, hence an economic cost price.

  An exemplary embodiment of the invention is described

  in detail below and with reference to the schematic drawing

  attached to it - Figure 1 shows a combustion engine

  internal system with control equipment

  cycla.e exhaust gas, and - Figure 2 is a view ern section of a valve

  exhaust gas recirculation.

  We see at the end.1 a part of a motor

  internal combustion 1 comprising a suction pipe

-6 -

  2, a device for forming the ml-angel -

  with the help of a trailing organ and a forearm of a keyboard which can be played by volorn J and

  iaile oni el, _. Eo-1a-p Woyaz sori ns.n.

isai> .l {: e- a ioodi 'd - ie .. e-

  -'-! BtuOuiu -.- d 7 suction 2 - F ...- o ... e the. oh;:, _mbres the u3Ju: 1 u --- c! U $: 'e.:s. eth o ',.} t oonic 1' s: ge dei and uar "-I a <y.î ... ^ 'c0) t U -lb3.uY7 1, e, 7a-la7 - ,: ; -'-2-u-5a. 0-a "- ti of the ao.; dla ', be oar de r & jav.a deo aa hor 2 ul es my; .J - e' t-ooy edce ra si! gu '6 e ttn eern ace taea another m ebr V-91ve to the: 3 ee dsent to greater gr: lceha = ee re ed) a 5 - appc- with his

  0 d: the first moon in the world, and the other one

  2a of the Ho1e ioi daes gan oou3e-l 2 3 0 of the 13th Clape! T-conique he is a Dagar s atige 13 2 i-neluse codules-.ene Ds punie guiding 14d Ce -'teite 13 at the opposite end of the road to the right of the meter; Tlre, is Pi on, 6s "to the idol of two." 1, an expert who, in the past, wears a wide range of pressure, which, by these 2-gauge loops, is a watertight seal of 3% in the shadows. included in a bed 23 of the bed-side, on the other side of the chamber 22, and a guide piece 14 of the bed shank 13, these two chambers 21 and 22 communicate with the atmosphere. pressure 19 comprises a connection 24 for the control line 10 and a guide 25 for a threaded sleeve 26 in which a set screw 27 is arranged. This sleeve 26 is itself screwed into a membrane axis 28 which , by means of two plates 29,30, maintains said other membrane 20. A compression spring 32 is housed under prestressing between the pressure chamber 19 and the diaphragm plate 29. A second compression spring 31 is housed under prestressing between the membrane plate 17 and a spring bowl 33 which bears against the d 26. These two springs are installed in such a way as to oppose a volume expansion of the pneumatic enclosure and, at rest, to apply on the one hand the conical valve 11 against its seat 12, on the other hand the membrane tray 30 against the cover 23 of the valve housing, the installed length of the spring 31 which acts

  on the membrane 18 is, when the valve is con

  be its seat 12 and the membrane plate 30 against

  the cover 23, adjustable by moving the sleeve

  the 26 in the membrane axis 28, while the length

  32 spring's installed beggar is, when the plateau

  membrane 17 is in contact with the casing 34 of the chamber

  19 and when the adjusting screw 27 is in contact with the valve stem 13, adjustable by

rotation of this screw.

  Operation of the exhaust gas recirculation control switch When the internal combustion engine 1 is running

  In slow motion, the low pressure prevailing in the

  suction bulge 2 is transmitted to the chamber of

  pressure 19 of the exhaust gas recirculation valve

  8 through the conduct of com-

  10. The diaphragm 20, whose effective surface area is larger than that of the diaphragm 18, acts by contacting the adjustment screw 27 with the

  valve 13, in the direction of closing the valve member

  -8 - nique 11 on his seat 12, and this against the force

  spring 32 and that exerted by the membrane 18.

  As the power supplied by the motor 1 increases, the pressure rises in the suction pipe 2 due to the larger opening

  4. The conical flap 11 opens, depending on the

  recall of the membrane 20, the section of the

  recycling line 6 in the valve 8, this opening

  until the reminder ends by meeting the plate 17 of the diaphragm 18 against

the housing 34.

  If the pressure continues to increase, the force

  which acts on the membrane 18 in the sense of opening

  Tuzre of the valve 11 and which is the product of the pressure.

  by the surface of the membrane decreases, so that the spring 31 can begin to move the conical valve it in the direction of closing, this movement being carried out until this valve has met

its seat 12.

-9

Claims (4)

  1, Control gear for recycling the exhaust gases of an internal combustion engine   compressing a mixture of air and fuel and com-   carrying a device for forming this mixture provided with a strangling member that can be operated at will, a gas re-alignment line being interposed   between the exhaust pipe and the intake pipe.   in order to bypass the chambers of com-   engine combustion, this recycling line com-   carrying an exhaust gas recirculation valve   with a pneumatic control system which is often   put under the pressure of the suction system downstream of the foreign body. and that controls the said valve so that - when the engine is running at a speed close to idle there is no return of exhaust gas in the suction system, - proportionally to the increase in the power supplied by the engine it is returned in the suction system more exhaust, and   - at full engine power it is not   exhaust gas in the vacuum system.   this apparatus being remarkable in that the exhaust gas recirculation valve (8) which comprises a conical valve (11) cooperating with a valve seat (12) has two membranes (18, 20) disposed therein one behind the other, having different effective surfaces, and whose faces facing one another delimit and isolate from the atmosphere a pressure chamber (19) connected to the suction pipe (2 ) through a control line (10), the membrane (18) having the smallest effective area being, by means of - 10 -   of two plates of nmembrane (16,17), associated with a rod (13) of the conical valve (11) g a spring (31) whose force is opposed to a reduction of volume of the chriabre of pressure (19) are applied against 1 ', n ,, 17) of these two plates and taking, at the same time, its opposite end to this plate (17) through a bowl of e-essort (33). urbouring (26) which 7esti has with possibility   of axial element axle dmams an axis (28) which is tix6e.   Day. two sets of patches (29,30), at 9   P-ae (qi the largest surface area is a% 5-year-old, 2nd quarter as a result of the use of this area. a (29) q, = X oateat.x daut .... c.part in the chamber of pres ciSWel e <% J a -: - orce of this spring s'osp-oeant urne te. .... 1 ..... voútE - -uúe of this family, e ....... la .... recyged des, d -hacement according to the revendica.tion i remarcuable n this cilue. at the beginning of the season: the day is backed up   -sure! _ (13) having the smallest   fectIve is adjustable by delae diment of the douje! (26) Dmans Il'e: e (28 "of the other membrane (20) when the cae, conical (i1) touches his seiège (12) and when the one (0) of the water (29,30) of this other membrane (20); ouche a lid (23) of the body of the v-valve, 2 and that 1 ug -, ugly? the spring (32) of the diaphragm (20) having the larger face is removed by removal of a set screw (2).   In this socket (26), this adjustment is made   e. P otarize from the position in which the one - 7 '7 dbs trays of .. a mean (18) having the most pei: ti effective surface is in contact with the body (04 / rle the pressure chamber (19 ) while said setting is (27) touches the end (15) of   the valve (13) opposite the conical valve (11).   The present invention relates to an apparatus for controlling the recycling of the exhaust gases of an internal combustion engine compressing a mixture of air and fuel and comprising a device for forming this mixture equipped with a fuel The recycling line is operable at will, a gas recirculation line being interposed between the exhaust pipe and the suction pipe so as to bypass the combustion chambers of the engine, this recycle line comprising a gas recirculation valve. exhaust with a pneumatic coimmanda system that is subjected to pressure   of the downstream suction system of the foreign   which controls the said valve so that when the engine is running at a speed close to idle, no exhaust gas is returned to the suction system, in proportion to the increase in the power supplied. by the engine it is returned in the suction system more exhaust, and   - at full engine power it is not   exhaust gas in the suction system.   Control gear of this kind serves to reduce the amount of different harmful constituents contained in the exhaust gases (for example the   nitric oxides and by recycling also in   carbon monoxide and hydrocarbons) that form during combustion of the mixture in the engine. several exhaust gas recyling devices have, as we know, already been proposed and even used in vehicles.   It is for example described in the application for   DE-A-1,1,464 an internal combustion engine -2 -   dull with exhaust gas recirculation   carries a pipe reeyclage of these gases arranged   between the exhaust pipe and the vacuum system   and bypassing the combustion chambers, this rewinding pipe including a recycle valve dornt the pneumatic control system, which compares the pressure prevailing in the intake pipe of the engine downstream of the d constriction of the mixture forming device at a pressure which is detrimental to the position of the fortran   in such a way that this vital remains.   when the engine is running   when it turns into a partial load infer-   ee and -1u ele / A'er under full load or under full load. When the throttle member is constituted by a flap or throttle, the pressure which prevails in the field of the edge of this throttle in idle position, so in almost closed position, is transmitted to the control system of the recycling valve. exhaust through a household control bore in this part of suction tubing.   This control system, however, has some disadvantages that may have repercussions   on recycling and on the proper operation of the engine.   It is a question of the watertightness of both chambers   pressure of the pneumatic control system,   which is difficult to ensure and which, in use, can lead to breakdowns, on the other hand the insufficient life of the membrane directly subjected to the action of very hot exhaust gases, which can iv ' This may cause the engine to shut down or malfunction of the engine, as the suction line is vented to the atmosphere.   3.5 in its downstream part of the throttle.   This is why another known exhaust-gas recirculation apparatus includes a control system.   valve which, between the throttle control chamber   exhaust chamber and the pressure chamber subjected to the suction pressure, further comprises a chamber   3 connected to the atmosphere to prevent the gases from   very hot exhaust are not in contact with the   membrane. In this type of apparatus it is necessary, however,   to predict a second control line for the supply of the pressure of the suction pipe, which is a source of expense and a risk of confusion   during assembly and, later, maintenance work.   The control bore in the field of the throttle closed position must be executed with the most   high precision because its position in relation to the   pifln determines the start-up or shutdown of the exhaust gas recirculation. This bore can not   so be executed quickly and is therefore expensive.   The problem to which the invention brought a solution   lution was then to design an exhaust gas recirculation equipment capable of ensuring a recycling corresponding to the needs of the engine so   that it emits only a few harmful and   economically. Such apparatus   In addition, it should be inexpensive to manufacture, not to   have control bore in the field of the or-   throttling and can be controlled by a only pressure chamber.   The solution according to the invention is characterized   due to the fact that the exhaust gas recirculation valve which has a cooperating conical flap   with a valve seat has two membranes available   one behind the other, having effective surfaces   different lenses, and whose faces   each other delimit and isolate the atmosphere.   a pressure chamber connected to the tubing   suction through a control line   - 4 - the membrane with the smallest surface   effective being, by means of two plateaux of mem-   brane, associated with a conical valve stem, a spring whose force opposes a reduction in volume of the pressure chamber being applied against one of these two trays and supported by its opposite end to this plate and- by means of a spring cup, against a socket which is arranged with the possibility of axial displacement in an axis to which is fixed, by means of two plates, the membrane which has the largest effective surface, a spring taking support on the one hand against one of these trays on the other hand in the pressure chamber, the force of this spring opposing a reduction of volume of this chamber. In the valve   so conceived it is advantageous for the length to be   the height of the spring which bears on the membrane having the smallest effective surface is adjustable by displacement of the sleeve in the axis of the other membrane when the conical-flapet touches its seat and when one of the trays of this other membrane touching a cover of the valve body, and that the installed length of the spring of the diaphragm having the largest surface is adjustable by moving a set screw disposed in said sleeve, this setting being made from the position in which one of the plates of the membrane having the smallest effective surface is in contact with the body of the pressinn chamber while the said   adjusting screw touches the end of the stem of pet opposite the conical flap.   The advantages of the exhaust gas recirculation apparatus designed according to the invention is that on the one hand the apparatus depends only on a single pilot quantity, namely the pressure which   reigns in the suction tubing downstream of the   throttling, this pressure being understood   between a minimum value and a maximum value   spaced apart from one another, in conjunction with a cone shaped damper designed accordingly, to ensure the flow rate of the recycled exhaust gas which is necessary for the engine to be smaller than the amount minirmum the production of gases from the other side of the flue and the enselne d; The control system of this system has a structure of simple construction, since the operating system of the   valve no longer receives the pressure of the tubing of   similarity in function of the position of the butterfly.   In addition, the manufacture of the exhaust gas recirculation valve is considerably simplified due to the suppression of the second chamber of   pressure, and the valve is less prone to disturbance.   Moreover, because the valve sdon the invention   Only one control fitting is used, any connection error during assembly of the valve or during its maintenance is excluded, the possibility of adjustment of the installed length of the springs allows the manufacturing tolerances.   the largest, hence an economic cost price.   An exemplary embodiment of the invention is described   in detail below and with reference to the schematic drawing   attached to it - Figure 1 shows a combustion engine   internal system with control equipment   cycla.e exhaust gas, and - Figure 2 is a view ern section of a valve   exhaust gas recirculation.   We see at the end.1 a part of a motor   internal combustion 1 comprising a suction pipe -6 -   2, a device for forming the ml-angel -   with the help of a trailing organ and a forearm of a keyboard which can be played by volorn J and   iaile oni el, _. Eo-1a-p Woyaz sori ns.n. isai> .l {: e- a ioodi 'd - ie .. e-   -'-! BtuOuiu -.- d 7 suction 2 - F ...- o ... e the. oh;:, _mbres the u3Ju: 1 u --- c! U $: 'e.:s. eth o ',.} t oonic 1' s: ge dei and uar "-I a <y.î ... ^ 'c0) t U -lb3.uY7 1, e, 7a-la7 - ,: ; -'-2-u-5a. 0-a "- ti of the ao.; dla ', be oar de r & jav.a deo aa hor 2 ul es my; .J - e' t-ooy edce ra si! gu '6 e ttn eern ace taea another m ebr V-91ve to the: 3 ee dsent to greater gr: lceha = ee re ed) a 5 - appc- with his   0 d: the first moon in the world, and the other one   2a of the Ho1e ioi daes gan oou3e-l 2 3 0 of the 13th Clape! T-conique he is a Dagar s atige 13 2 i-neluse codules-.ene Ds punie guiding 14d Ce -'teite 13 at the opposite end of the road to the right of the meter; Tlre, is Pi on, 6s "to the idol of two." 1, an expert who, in the past, wears a wide range of pressure, which, by these 2-gauge loops, is a watertight seal of 3% in the shadows. included in a bed 23 of the bed-side, on the other side of the chamber 22, and a guide piece 14 of the bed shank 13, these two chambers 21 and 22 communicate with the atmosphere. pressure 19 comprises a connection 24 for the control line 10 and a guide 25 for a threaded sleeve 26 in which a set screw 27 is arranged. This sleeve 26 is itself screwed into a membrane axis 28 which , by means of two plates 29,30, maintains said other membrane 20. A compression spring 32 is housed under prestressing between the pressure chamber 19 and the diaphragm plate 29. A second compression spring 31 is housed under prestressing between the membrane plate 17 and a spring bowl 33 which bears against the d 26. These two springs are installed in such a way as to oppose a volume expansion of the pneumatic enclosure and, at rest, to apply on the one hand the conical valve 11 against its seat 12, on the other hand the membrane tray 30 against the cover 23 of the valve housing, the installed length of the spring 31 which acts   on the membrane 18 is, when the valve is con   be its seat 12 and the membrane plate 30 against   the cover 23, adjustable by moving the sleeve   the 26 in the membrane axis 28, while the length   32 spring's installed beggar is, when the plateau   membrane 17 is in contact with the casing 34 of the chamber   19 and when the adjusting screw 27 is in contact with the valve stem 13, adjustable by rotation of this screw.   Operation of the exhaust gas recirculation control switch When the internal combustion engine 1 is running   In slow motion, the low pressure prevailing in the   suction bulge 2 is transmitted to the chamber of   pressure 19 of the exhaust gas recirculation valve   8 through the conduct of com-   10. The diaphragm 20, whose effective surface area is larger than that of the diaphragm 18, acts by contacting the adjustment screw 27 with the   valve 13, in the direction of closing the valve member   -8 - nique 11 on his seat 12, and this against the force   spring 32 and that exerted by the membrane 18.   As the power supplied by the motor 1 increases, the pressure rises in the suction pipe 2 due to the larger opening   4. The conical flap 11 opens, depending on the   recall of the membrane 20, the section of the   recycling line 6 in the valve 8, this opening   until the reminder ends by meeting the plate 17 of the diaphragm 18 against the housing 34.   If the pressure continues to increase, the force   which acts on the membrane 18 in the sense of opening   Tuzre of the valve 11 and which is the product of the pressure.   by the surface of the membrane decreases, so that the spring 31 can begin to move the conical valve it in the direction of closing, this movement being carried out until this valve has met its seat 12. -9   1, Control gear for recycling the exhaust gases of an internal combustion engine   compressing a mixture of air and fuel and com-   carrying a device for forming this mixture provided with a strangling member that can be operated at will, a gas re-alignment line being interposed   between the exhaust pipe and the intake pipe.   in order to bypass the chambers of com-   engine combustion, this recycling line com-   carrying an exhaust gas recirculation valve   with a pneumatic control system which is often   put under the pressure of the suction system downstream of the foreign body. and that controls the said valve so that - when the engine is running at a speed close to idle there is no return of exhaust gas in the suction system, - proportionally to the increase in the power supplied by the engine it is returned in the suction system more exhaust, and   - at full engine power it is not   exhaust gas in the vacuum system.   this apparatus being remarkable in that the exhaust gas recirculation valve (8) which comprises a conical valve (11) cooperating with a valve seat (12) has two membranes (18, 20) disposed therein one behind the other, having different effective surfaces, and whose faces facing one another delimit and isolate from the atmosphere a pressure chamber (19) connected to the suction pipe (2 ) through a control line (10), the membrane (18) having the smallest effective area being, by means of - 10 -   of two plates of nmembrane (16,17), associated with a rod (13) of the conical valve (11) g a spring (31) whose force is opposed to a reduction of volume of the chriabre of pressure (19) are applied against 1 ', n ,, 17) of these two plates and taking, at the same time, its opposite end to this plate (17) through a bowl of e-essort (33). urbouring (26) which 7esti has with possibility   of axial element axle dmams an axis (28) which is tix6e.   Day. two sets of patches (29,30), at 9   P-ae (qi the largest surface area is a% 5-year-old, 2nd quarter as a result of the use of this area. a (29) q, = X oateat.x daut .... c.part in the chamber of pres ciSWel e <% J a -: - orce of this spring s'osp-oeant urne te. .... 1 ..... voútE - -uúe of this family, e ....... la .... recyged des, d -hacement according to the revendica.tion i remarcuable n this cilue. at the beginning of the season: the day is backed up   -sure! _ (13) having the smallest   fectIve is adjustable by delae diment of the douje! (26) Dmans Il'e: e (28 "of the other membrane (20) when the cae, conical (i1) touches his seiège (12) and when the one (0) of the water (29,30) of this other membrane (20); ouche a lid (23) of the body of the v-valve, 2 and that 1 ug -, ugly? the spring (32) of the diaphragm (20) having the larger face is removed by removal of a set screw (2).   In this socket (26), this adjustment is made   e. P otarize from the position in which the one - 7 '7 dbs trays of .. a mean (18) having the most pei: ti effective surface is in contact with the body (04 / rle the pressure chamber (19 ) while said setting is (27) touches the end (15) of   the valve (13) opposite the conical valve (11).