Abstract:
A fluid assembly in a hydraulic circuit, comprising one or more reservoirs configured to store fluid. The fluid assembly also includes a pump configured to transport the fluid in the hydraulic circuit and actuate a load from a transmission of a motor vehicle, a pressure accumulator configured to collect pressure built up by the pump and actuate the load, and a valve system configured to allow fluid communication of the load with the pump.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is the U.S. National Phase Application of PCT Appln. No. PCT/DE2016/200080 filed Feb. 8, 2016, which claims priority to DE Patent Application No. 10 2015 202 581.0 filed Feb. 12, 2015, the disclosures of which are incorporated in their entirety by reference herein. 
     
    
     TECHNICAL FIELD 
       [0002]    The disclosure relates to a fluid assembly and a method for fluidic actuation of at least one load of a motor vehicle. 
       BACKGROUND 
       [0003]    A fluid assembly for controlling a double clutch transmission of a motor vehicle is disclosed in DE 10 2008 009 653 A1. The fluid assembly may include a hydraulic energy source for supplying the fluid assembly with hydraulic energy by means of a hydraulic medium, a pressure accumulator for storing the hydraulic energy, a clutch cooling system for cooling clutches of the double clutch transmission by means of the hydraulic medium, and clutch actuators for actuating a first clutch and a second clutch, wherein the hydraulic energy source may include a dual-flow electrical pump. 
       SUMMARY 
       [0004]    There may be the constant need to simplify the actuation of at least one load in a fluid assembly with a fluidic energy source. 
         [0005]    The object of one embodiment is to create a fluid assembly with measures that may simplify the actuation of at least one load with a fluidic energy source. 
         [0006]    The solution for this objective may be achieved according to an embodiment of a fluid assembly having the features of claim  1 . Alternative embodiments are given in the dependent Claims, each of which may represent, individually or in combinations thereof, an aspect of the disclosure. 
         [0007]    The disclosure relates to a fluid assembly for the fluidic actuation of a first load and/or a second load of a motor vehicle in a hydraulic circuit, comprising a pump for conveying a fluid in the hydraulic circuit, a pressure accumulator for accumulating pressure built up by the pump, at least one reservoir for storing fluid, and a valve system for connecting the hydraulic circuit, wherein the valve system, the first load, and/or the second load, the pump, the pressure accumulator and the reservoir are interconnected, and wherein the first load and/or the second load can be actuated by the pump and/or the pressure accumulator. 
         [0008]    As a result of the valve system, a second actuator, e.g. a second pump for actuating the load, can be eliminated. The first load and/or the second load can be actuated instead with just one pump and/or the pressure accumulator. The valve system can enable a connection that connects the pump with the first load and/or the second load; in particular when the load is a double clutch, the valve system can connect the pump with one of the sub-clutches. Furthermore, the valve system can connect the pressure accumulator with the first load and/or the second load; in particular when the load is a double clutch, the valve system can connect the pressure accumulator with one of the sub-clutches. Another connection possibility can be the connection between the pump and the pressure accumulator. By way of example, the pump can fill the pressure accumulator while the first load is not actuated, e.g. when the clutch is disengaged. Another example is the filling of the pressure accumulator via the pump when the first load is actuated, e.g. an engaged clutch with excess contact pressure, such that the torque that can be transferred by the clutch is greater than the torque generated by the motor by a predefined quantity. By way of example, the clutch can be actuated by the pressure accumulator, and the pump can simultaneously fill the pressure accumulator with fluid. The valve system can also block the load, such that fluid for actuating the load cannot flow to the load. The fluid can also be discharged from the load connected to the pressure accumulator into the reservoir through the valve system, wherein preferably the pressure accumulator is previously disconnected by the valve system, such that the pressure accumulator can maintain the pressure. By way of example, the valve system can also connect both sub-clutches to the reservoir when the load is a double clutch. In this manner, a reliably open state, e.g. a functional reliability (abbreviated in German to “FuSi” for the German term “Funktionssicherheit”), can be obtained. When parking the vehicle, a connection of all of the fluid spaces to the reservoir can be enabled using the valve system. Furthermore, instead of providing an individual actuator for each load, e.g. an individual pump, the first load or the second load can be actuated via the pressure accumulator, e.g. for a quick actuation in order to overcome a free travel. In this manner, components for a fluid assembly can be eliminated, by means of which the fluid assembly can be simplified. Furthermore, the energy balance in the fluid assembly can be improved through the use of a pump and a pressure accumulator, because a usable portion of the pressure accumulator can be used directly to actuate a load. Many diverse connection possibilities can be implemented with a fluid assemble designed in this manner, by means of which the actuation of at least one load with a fluidic energy source can be simplified in a fluid assembly. 
         [0009]    The fluid assembly may be a hydraulic assembly that is operated with a hydraulic medium, such as hydraulic fluid. The pump may be a hydraulic pump, in particular having a positive displacement design, e.g. a vane pump, a gearwheel pump, or a piston pump. An electric motor may be used, for example, to drive the pump. The pump used to actuate the at least one load may be also referred to as a pump actuator. The load can be a transmission component, for example, such as a gear setting device, which can be used for guiding a selection and/or shifting movement. Furthermore, the at least one load can be a clutch, e.g. a single clutch or a double clutch. The clutch can be actuated directly or indirectly. The clutch can furthermore have a wet or dry running design. 
         [0010]    In a preferred embodiment, the first load, in particular a clutch, and the second load, in particular a transmission actuator, are connected to the pump. In this manner, the pump can actuate either the first load or the second load. 
         [0011]    The pump preferably comprises a first discharge direction for actuating the first load, and a second discharge direction opposite to the first discharge direction, for actuating the second load. As a result, the pressure direction of the pump can be set according to the load that is to be actuated. 
         [0012]    In a preferred embodiment, the reservoir for storing fluid is connected in the direction of the first load and in the direction of the second load through the interconnection of a dual-pressure valve. It can be ensured in a simple manner by the dual-pressure valve that pressure can only be applied in one direction. After the pressure diminishes, it can be switched in the other direction. The dual-pressure valve has two settings. In a first setting, the dual-pressure valve can be connected in the direction of the first load, and in a second setting, the dual-pressure valve can be connected in the direction of the second load. When pressure is built up, for example, toward the first load, the dual-pressure valve is in the first setting. This first setting is maintained by the dual-pressure valve as long as there is pressure applied to the first load. In this manner, it is possible to prevent an actuation of the second load when the pressure direction of the pump is reversed. 
         [0013]    The pressure accumulator may be connected to the first load and the second load. In particular, the pressure accumulator can be connected to the first load and the second load via the valve system. By way of example, the valve system can have a setting that connects the pressure accumulator to the first load or the second load. In particular, the pressure accumulator can actuate the first load or the second load through such a connection. 
         [0014]    In a preferred embodiment, the valve system may include a setting in which the pressure accumulator and the pump are interconnected in order to actuate the first load or the second load. By way of example, the pressure accumulator can support the pump when actuating the first load or the second load, such that the pressure accumulator provides pressure for actuating the load, and the pump simultaneously actuates the load. By way of example, a first load, e.g. a clutch, can be kept in an engaged setting by the pressure of the pressure accumulator, wherein the pump does not need as much energy to maintain the actuation pressure as a result of the pressure accumulator. In particular, a clutch can be kept engaged up to a maximum pressure of an excess contact pressure using the pressure accumulator. In this manner, energy can be conserved, and the energy balance of the fluid assembly can be improved. 
         [0015]    The first load may be a double clutch, wherein the double clutch comprises a first sub-clutch and a second sub-clutch, wherein the valve system comprises a setting in which the first sub-clutch and/or the second sub-clutch can be actuated by the pump. By way of example, the first sub-clutch and the second sub-clutch could be engaged simultaneously by the pump. In particular, an independent actuation of both sub-clutches by the pump can occur. The pressure accumulator can be completely separated from the fluid assembly by the valve system thereby, such that the pump can actuate just the first load. In this manner, a full functioning of the first sub-clutch and the second sub-clutch can be enabled using just one pump. In this manner, a second actuator, e.g. a second pump, for actuating a double clutch can be eliminated. By using a pump, the energy consumption for actuating the double clutch can be further reduced, such that the energy consumption can also be optimized. 
         [0016]    In particular, the pressure accumulator and the pump can be connected to the first sub-clutch and/or the second sub-clutch collectively via a shared hydraulic line, such that the pump and the pressure accumulator can function simultaneously, in order to actuate the first sub-clutch and/or the second sub-clutch. In this manner, energy for actuating the clutch by the pump can be conserved using the pressure provided by the pressure accumulated. 
         [0017]    The valve system may include a setting, in which the pump actuates the first sub-clutch or the second sub-clutch, and the pressure accumulator actuates the first sub-clutch or the second sub-clutch, wherein the sub-clutch actuated by the pump is not the sub-clutch actuated by the pressure accumulator. In this manner, the pressure accumulator can engage the first sub-clutch, for example, while the pump disengages the second sub-clutch. As a result, a further actuator, e.g. a second pump, is unnecessary. Furthermore, the pump and the pressure accumulator can be connected to the sub-clutches via different hydraulic lines. 
         [0018]    The valve system may include a setting in which the pressure accumulator actuates the first load or the second load, and simultaneously, and independently of the pressure accumulator, the pump actuates the first load or the second load, wherein the load actuated by the pump is not the load actuated by the pressure accumulator. By way of example, the pump can actuate a second load, in particular a hydrostatic transmission actuator, and the pressure accumulator can simultaneously actuate the first load, e.g., with a double clutch, it can modulate a sub-clutch. 
         [0019]    The disclosure may further relate to a method for the fluidic actuation of a first load and/or second load of a motor vehicle, having a fluidic energy source, in particular having a fluid assembly, which can be designed and developed as described above, wherein the fluid assembly comprises a valve system, and the first load and/or the second load can be interconnected to the pump, the pressure accumulator, and the reservoir by the valve system, wherein the first load and/or the second load can be actuated by the pump and/or the pressure accumulator. 
         [0020]    Numerous diverse connection options can be implemented by a method having a fluid assembly that can be designed and developed as described above, by means of which the actuation of at least one load with a fluidic energy source can be simplified in a fluid assembly. 
         [0021]    The first load or the second load may be actuated by the pressure accumulator, and simultaneously, and independently of the pressure accumulator, the first load or the second load is actuated by the pump, wherein the load actuated by the pump is not the load actuated by the pressure accumulator. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]    The various embodiments shall be explained by way of example below, with reference to the attached drawings based on exemplary embodiments, wherein the features depicted below can represent an aspect of the embodiment in and of themselves as well as in combinations thereof. Therein: 
           [0023]      FIG. 1 : shows a schematic illustration of a fluid assembly having one load, 
           [0024]      FIG. 2 : shows a schematic illustration of another fluid assembly having one load, 
           [0025]      FIG. 3 : shows a schematic illustration of another fluid assembly having one load, 
           [0026]      FIG. 4 : shows a schematic illustration of a fluid assembly having two loads, 
           [0027]      FIG. 5 : shows a schematic illustration of a fluid assembly having 3/3 directional valves, 
           [0028]      FIG. 6 : shows a schematic illustration of a fluid assembly having seated valves, 
           [0029]      FIG. 7 : shows a schematic illustration of a fluid assembly having an alternative valve system, 
           [0030]      FIG. 8 : shows a schematic illustration of a fluid assembly having another alternative valve system, and 
           [0031]      FIG. 9 : shows a schematic illustration of a fluid assembly having another alternative valve system. 
       
    
    
     DETAILED DESCRIPTION 
       [0032]    A fluid assembly  10  for the fluidic actuation of a load  12  of a, not shown, motor vehicle in a hydraulic circuit is depicted in  FIG. 1 . The hydraulic circuit is depicted as a line between the individual components of the fluid assembly  10 . The fluid assembly  10  comprises a pump  14  for conveying a fluid in the hydraulic circuit, a pressure accumulator  16  for accumulating a pressure generated by the pump  18 , at least one reservoir  18 , for storing fluid, and a valve system  20  for connecting the hydraulic circuit. The pump  14  is powered by an electrical motor  26 . 
         [0033]    The load  12  is depicted as a double clutch having a first sub-clutch  22  and a second sub-clutch  24 . The valve system  20  may enable various connections to be established in the fluid assembly thereby. The valve system  20  can connect the pump  14  to the first sub-clutch  22  or the second sub-clutch  24 . The valve system  20  may also connect the pressure accumulator  16  to the first sub-clutch  22  or the second sub-clutch  24 . The valve system  20  may also connect the pump  14  to the pressure accumulator  16  in order to build up pressure in the pressure accumulator  16 . The valve system may also block the first sub-clutch  22  and the second sub-clutch  24 . The valve system may be configured to discharge the fluid from the sub-clutch connected to the pressure accumulator  16  into the reservoir  18 , wherein the pressure accumulator  16  may be separated to ensure that the pressure in the pressure accumulator does not drop. The valve system may also be configured to produce a connection of the first sub-clutch  22  and the second sub-clutch  24  to the reservoir  18  in order to enable a reliably disengaged state, a so-called functional reliability (abbreviated in German as FuSi) or to create a connection of all of the fluid spaces in the fluid assembly to the reservoir  18  when the vehicle is parked. 
         [0034]    Another embodiment of a fluid assembly  32  is depicted in  FIG. 2 . The same reference symbols are used for identical components in the fluid assembly  32  as in the fluid assembly  10  in  FIG. 1 . The valve system in this exemplary embodiment comprises a non-return valve  28  and a seated valve  30 . The non-return valve  28  prevents the pressure accumulator  16  from conveying fluid to the pump  14 . Only the pump  14  can transfer fluid to the pressure accumulator  16 . The seated valve  30  is a 2/2 directional valve having a closed setting for connecting the pressure accumulator  16  to the load  34 , and an open setting for preventing a connection of the pressure accumulator  16  to the load  34 . The seated valve  30  is depicted in the open setting in  FIG. 2 . The load  34  can be a transmission actuator or a clutch. The fluid assembly  32  furthermore comprises a pump  14 , which is actuated by an electrical motor  26 . The pump  14  is connected to a reservoir  18  via a dual-pressure valve  36 . The pump  14  comprises a first discharge direction for actuating the load  34  and a second discharge direction, opposite the first discharge direction, for building up pressure in the pressure accumulator  16 . The first discharge direction and the second discharge direction are depicted as arrows in the pump  14 . By interconnecting the dual-pressure valve  36 , the pump  14  can be connected toward the load  34  and toward the pressure accumulator  16 . The dual-pressure valve  36  has two settings. In a first setting, the dual-pressure valve  36  can be connected toward the load  34 , and in a second setting, the dual-pressure valve  36  can be connected toward the pressure accumulator  16 , in order to connect the respective direction to the reservoir  18 . When, for example, pressure is built up by the pump  16  toward the load  34 , the dual-pressure valve  36  is in the first setting. This first setting is maintained by the dual-pressure valve  36  if there is pressure directed toward the load  34 . In this manner, it is possible to prevent the pressure accumulator  16  from being filled with fluid when the discharge direction of the pump  14  is reversed. 
         [0035]    Another embodiment of a fluid assembly  38  is depicted in  FIG. 3 . The same reference symbols are used for identical components in  FIG. 3  as in  FIG. 2 . In  FIG. 3 , the pressure accumulator  16  is connected via a hydraulic line directly to the load  34 , via the seated valve  30 . 
         [0036]    Another embodiment of a fluid assembly  40  is depicted in  FIG. 4 . The same reference symbols are used for identical components in  FIG. 4  as in  FIG. 1  and  FIG. 2 . In  FIG. 4 , the pump  14  is connected to a second load  42 , e.g. a transmission actuator. Furthermore, the fluid assembly  40  has a dual-pressure valve  36 . The pump  14  has a first discharge direction for actuating the double clutch, and a second discharge direction for actuating the second load  42 . 
         [0037]    Another embodiment of a fluid assembly  44  is depicted in  FIG. 5 . The same reference symbols are used for identical components in  FIG. 5  as in  FIG. 4 . In  FIG. 4 , the valve system  20  comprises three 3/3 directional valves  46   a, b, c . The 3/3 directional valve  46   a  enables a connection of the pressure accumulator  16  to the first sub-clutch  22  or the second sub-clutch  24 , as well as an open setting. The 3/3 directional valve  46   b  enables a connection of the pump  14  to the first sub-clutch  22  or the second sub-clutch  24 , as well as an open setting. The 3/3 directional valve  46   c  enables the connection of the pressure accumulator to the pump  14  or the reservoir  18 , as well as an open setting. In  FIG. 5 , the 3/3 directional valves  46   a, b, c  are all shown in the open setting. 
         [0038]    Another embodiment of a fluid assembly  48  is depicted in  FIG. 6 . The same reference symbols are used for identical components in  FIG. 6  as in  FIG. 5 . In  FIG. 6 , the valve system  20  comprises a total of seven seated valves  50   a, b, c, d, e, f, g , which are designed as 2/2 directional valves, and each have a closed setting and an open setting. All of the seated valves  50   a, b, c, d, e, f, g  are depicted in an open setting. The pressure valve can be connected to the hydraulic line of the fluid assembly  48  by the seated valve  50   a . A second reservoir  18  can be connected to the hydraulic line of the fluid assembly  48  by the seated valve  50   b . The second reservoir  18  can be the reservoir  18  that is connected to the dual-pressure valve  36  thereby, or it can be another reservoir  18 . The seated valve  50   c  enables a connection of the pump  14  to the pressure accumulator  16  and/or the reservoir  18 . The pump  14  can be connected to the first sub-clutch  22  by the seated valve  50   d . The pressure accumulator  16  and/or the reservoir  18  can be connected to the first sub-clutch  22  by the seated valve  50   e . The seated valve  50   f  enables the pump  14  to actuate the second sub-clutch  24 . The pressure accumulator  16  and/or the reservoir  18  can be connected to the second sub-clutch  24  by the seated valve  50   g . It is possible thereby for the pump  14 , together with the pressure accumulator  16  and/or the reservoir  18 , to actuate the first sub-clutch  22  and/or the second sub-clutch  24 . Furthermore, the pump  14  can actuate the second load  42  while at the same time, the pressure accumulator  16  and/or the reservoir  18  are connected to the first sub-clutch  22  and/or the second sub-clutch  24 . 
         [0039]    Another embodiment of a fluid assembly  52  is depicted in  FIG. 7 . The same reference symbols are used for identical components in  FIG. 7  as in  FIG. 6 . In  FIG. 7 , the pressure accumulator  16  is connected to the pump  14  via its own hydraulic line. Furthermore, the second reservoir  18  is not connected to the pump  14  via a hydraulic line. The valve system  20  likewise comprises seven seated valves  54   a, b, c, d, e, f, g  in  FIG. 7 . The seated valves  54   a, b, c, d, e, f, g  are 2/2 directional valves, and have a closed setting and an open setting. All of the seated valves  54   a, b, c, d, e, f, g  are depicted in the open setting in  FIG. 7 . The pressure accumulator  16  is connected to the pump  14  by the seated valve  54   a , such that the pump  14  can conduct fluid into the pressure accumulator  16 , or the pump  14  can, together with the pressure accumulator, actuate the first sub-clutch  22  and/or the second sub-clutch  24 . The reservoir  18  is connected to the second sub-clutch  24  using the seated valve  54   b . The pressure accumulator  16  is connected to the second sub-clutch  24  by the seated valve  54   c . The seated valve  54   d  enables a connection of the pump  14  with the second sub-clutch  24 . The reservoir  18  is connected to the first sub-clutch  22  using the seated valve  54   e . The pressure accumulator  16  is connected to the first sub-clutch  22  by the seated valve  54   f . The seated valve  54   g  enables a connection of the pump  14  to the first sub-clutch  22 . It is possible thereby for the pump  14  to actuate, together with the pressure accumulator  16 , the first sub-clutch  22  and/or the second sub-clutch  24 . Furthermore, the pump  14  can actuate the second load  42  while the pressure accumulator  16  and/or the reservoir  18  are connected at the same time to the first sub-clutch  22  and/or the second sub-clutch  24 . 
         [0040]    Another embodiment of a fluid assembly  56  is depicted in  FIG. 8 . The same reference symbols are used for identical components in  FIG. 8  as in  FIG. 7  and  FIG. 2 . In  FIG. 8 , the pressure accumulator  16  is only connected to the first sub-clutch  22  and the second sub-clutch  24  via a hydraulic line shared with the pump  14 . Furthermore, the second reservoir  18  is not connected to the pump  14  via a hydraulic line. There is a non-return valve  28  in  FIG. 8 , so that only the pump  14  can transfer fluid to the pressure accumulator  16 . The valve system  20  comprises five seated valves  58   a, b, c, d, e  in  FIG. 8 . The seated valves  58   a, b, c, d, e  are 2/2 directional valves, and have a closed setting and an open setting. All of the seated valves  58   a, b, c, d, e  are depicted in the open setting in  FIG. 8 . The pressure accumulator  16  is connected to the hydraulic line of the pump  14  by the seated valve  58   a , such that the pump  14  can transfer fluid to the pressure accumulator  16 , or the pump  14  can actuate, together with the pressure accumulator  16 , the first sub-clutch  22  and/or the second sub-clutch. Moreover, the pressure accumulator  16  can be separated from the hydraulic line through an open setting of the seated valve  58   a , such that the pump  14  can actuate the first sub-clutch  22  and/or the second sub-clutch  24  by itself. Furthermore, the pressure accumulator  16  can actuate the first sub-clutch  22  and/or the second sub-clutch  24 , while the pump  14  actuates the second load  42 . The reservoir  18  is connected to the second sub-clutch  24  using the seated valve  58   b . The pressure accumulator  16  and/or the pump are connected to the second sub-clutch  24  by the seated valve  58   c . The reservoir  18  is connected to the first sub-clutch  22  using the seated valve  58   d . The pressure accumulator  16  and/or the pump  14  are connected to the first sub-clutch  22  by the seated valve  58   e . It is possible thereby for the pump  14 , together with the pressure accumulator  16 , to actuate the first sub-clutch  22  and/or the second sub-clutch  24 . Furthermore, the pump  14  can actuate the second load  42  while the pressure accumulator  16  and/or the reservoir  18  are connected at the same time to the first sub-clutch  22  and/or the second sub-clutch  24 . 
         [0041]    Another embodiment of a fluid assembly  60  is depicted in  FIG. 9 . The same reference symbols are used for identical components in  FIG. 9  as in  FIG. 8 . In  FIG. 9 , the pressure accumulator  16  is connected to the second load  42  via its own hydraulic line. Furthermore, the second reservoir  18  is not connected to the pump  14  via a hydraulic line. There are two non-return valves  28  in  FIG. 9 , such that the pressure accumulator  16  cannot transfer any fluid to the pump  14 . The valve system  20  comprises six seated valves  62   a, b, c, d, e, f  in  FIG. 9 . The seated valves  62   a, b, c, d, e, f  are 2/2 directional valves, and have a closed setting and an open setting. All of the seated valves  62   a, b, c, d, e, f  are depicted in the open setting in  FIG. 9 . The pressure accumulator  16  is connected to the second load  42  and the pump  14  by the seated valve  62   a , such that the pump  14  can transfer fluid to the pressure accumulator  16 , or the pressure accumulator  16  can actuate the second load  42 , either together with the pump  14 , or alone. The seated valve  62   b  enables the pressure accumulator to actuate the first sub-clutch  22  and/or the second sub-clutch  24 , either together with the pump  14 , or alone, e.g. when the pump  14  actuates the second load  42 . The reservoir  18  is connected to the second sub-clutch  24  using the seated valve  62   c . The pump  14  and/or the pressure accumulator  16  are connected to the second sub-clutch  24  by the seated valve  62   d . The reservoir  18  is connected to the first sub-clutch  22  using the seated valve  62   e . The pump  14  and/or the pressure accumulator  16  are connected to the first sub-clutch  22  by the seated valve  62   f . The second load  42 , the first sub-clutch  22  and/or the second sub-clutch  24  can be actuated by the pressure accumulator  16  or by the pump  14 , or by both, by means of the fluid assembly depicted in  FIG. 9 . 
       LIST OF REFERENCE SYMBOLS 
       [0042]      10  fluid assembly 
         [0043]      12  load 
         [0044]      14  pump 
         [0045]      16  pressure accumulator 
         [0046]      18  Reservoir 
         [0047]      20  valve system 
         [0048]      22  first sub-clutch 
         [0049]      24  second sub-clutch 
         [0050]      26  electrical motor 
         [0051]      28  non-return valve 
         [0052]      30  seated valve 
         [0053]      32  fluid assembly 
         [0054]      34  load 
         [0055]      36  dual-pressure valve 
         [0056]      38  fluid assembly 
         [0057]      40  fluid assembly 
         [0058]      42  second load 
         [0059]      44  fluid assembly 
         [0060]      46   a, b, c  3/3 directional valve 
         [0061]      50   a, b, c, d, e, f, g  seated valve 
         [0062]      52  fluid assembly 
         [0063]      54   a, b, c, d, e, f, g  seated valve 
         [0064]      56  fluid assembly 
         [0065]      58   a, b, c, d, e , seated valve 
         [0066]      60  fluid assembly 
         [0067]      62   a, b, c, d, e, f  seated valve