CN100404882C

CN100404882C - Multi-function hydraulic valve assembly

Info

Publication number: CN100404882C
Application number: CNB038049597A
Authority: CN
Inventors: L·蒙达尼; M·多德
Original assignee: Lift Technologies Inc Canada
Current assignee: LIFT TECHNOLOGIES Inc
Priority date: 2002-03-01
Filing date: 2003-02-14
Publication date: 2008-07-23
Anticipated expiration: 2023-02-14
Also published as: CN1639467A; CA2476759C; CA2476759A1; AU2003203106A1; ATE444449T1; EP1481168A1; DE60329471D1; EP1481168B1; JP2005519244A

Abstract

A hydraulic valve assembly for selectably delivering hydraulic fluid from a supply of hydraulic fluid to one of a first hydraulic operator (80) and a second hydraulic operator (82) is disclosed. The assembly includes first (32) and second (34) supply ports which communicate with the supply (18) and four operator ports (44,46,48,50). First (44) and third (48) ports communicate with the first hydraulic operator (80). Second (46) and fourth (50) ports communicate with the fourth hydraulic operator (82). First (36) and second (38) chambers are provided. The first chamber communicates with the first supply port and first and second operator ports. The second chamber communicates with the second supply port and third and fourth operator ports . Two selection valves (60,61) operating in unison are each located in each chamber. The selection valves operate between a first position at a first hydraulic fluid pressure and a second position at a second hydraulic fluid pressure. In a first position, the valves permit fluid communication of the first and second supply ports with the first and third operator ports, respectively. In a second position, the valves permit fluid communication with the second and fourth operator ports.

Description

Multi-function hydraulic valve assembly

Technical field

The present invention relates to hydraulic system, in particular to a kind of multi-function hydraulic valve assembly.

Background of invention

It is well-known that hydraulic system is used for moving or promoting goods.In general, this system adopts pressurised hydraulic fluid to drive hydraulic control unit, for example piston/cylinder arrangements.Machinery, for example lift or a truck may need several hydraulic control units to move goods in several different modes.In general, various hydraulic control units are controlled by the controlling rod in the operator cabin that is arranged on machine or vehicle respectively.Adopting an example of hydraulic system by this way is crane vehicle.

Crane vehicle is to be used for promoting goods and goods is moved to the used vehicle in another location from a position.Traditional crane vehicle comprises a support that is supported with a pair of fork.Fork is handled in place by the crane vehicle Effector, and is used to promote goods.Support is ridden vertically to lean against in the prypole and by this prypole and is supported.In addition, prypole can recede, and it is stable what stick to be beneficial to goods.Adopt two independently hydraulic control unit support is vertically moved and prypole is tilted.

The device of several enhancing crane vehicle performances is known in related domain.A kind of such device is the side shifting assembly, and it helps the spaced apart paired fork is aimed at goods.Term " side shifting " is to be used for describing pitching the notion of turning up the soil and moving on the left side or the right side of vehicle centre-line at interval in pairs.This function with vehicle and goods to providing bigger error allowance for Effector on time.Hydraulic control unit, for example piston/cylinder arrangements are adopted by the side shifting assembly usually, to move the framework that is fixed with fork on it.

The another kind of device that strengthens the crane vehicle performance is the fork positioning component.Term " fork location " is used for describing the relative spacing that changes between each fork notion with the goods that holds different in width.In addition, hydraulic control unit, for example piston/cylinder arrangements are used in the fork positioning component and come shift fork.

A kind of operator cabin of conventional lift truck is provided with three controlling rods, to handle three hydraulic control units.Therefore, if the user needs four hydraulic control units,, an additional controlling rod must be installed so that the operating fork positioning device for example by the assembling fork positioning device.

Perhaps, prior art system allows to operate two independently hydraulic control units with a single controlling rod on a crane vehicle.These systems adopt electronic circuit to get in touch between two hydraulic control units.Move hydraulic system carried out control lever actuated before, the user will start electronic switch so that select suitable hydraulic control unit.This system has increased the cost and the complexity of crane vehicle design.In addition, must above the prypole of crane vehicle, cable be set.

Therefore, need the enough single controlling rods of a kind of energy that more than one hydraulic control unit is carried out optionally hydraulically operated hydraulic valve assembly.

Summary of the invention

According to a first aspect of the invention, provide a kind of hydraulic fluid has been transported to one of them hydraulic valve assembly of first hydraulic control unit and second hydraulic control unit from the hydraulic fluid supply source.This assembly comprises:

A) valve body, this valve body defines:

I) first supplying mouth that is communicated with described supply source fluid;

Ii) second supplying mouth that is communicated with described supply source fluid;

Iii) first operator port that is communicated with the described first hydraulic control unit fluid;

Iv) second operator port that is communicated with the described second hydraulic control unit fluid;

V) the 3rd operator port that is communicated with the described first hydraulic control unit fluid;

Vi) the 4th operator port that is communicated with the described second hydraulic control unit fluid;

Vii) one first chamber, this first chamber is communicated with described first supplying mouth, first operator port and the second operator port fluid;

Viii) one second chamber, this second chamber is communicated with described second supplying mouth, the 3rd operator port and the 4th operator port fluid;

B) first selector valve and second selector valve that is arranged in described second chamber that is arranged in described first chamber, consistent the moving of described first and second selector valves, described first and second selector valves are operable in primary importance and described hydraulic fluid the second place when being in second pressure of described hydraulic fluid when being in first pressure, wherein in described primary importance, described first selector valve realizes that between described first supplying mouth and described first operator port fluid is communicated with, described second selector valve realizes that between described second supplying mouth and described the 3rd operator port fluid is communicated with, wherein in the described second place, described first selector valve realizes that between described first supplying mouth and described second operator port fluid is communicated with, and described second selector valve realizes that between described second supplying mouth and described the 4th operator port fluid is communicated with;

Wherein said first pressure is lower than described second pressure.

According to a second aspect of the invention, provide a kind of hydraulic fluid has been transported to one of them hydraulic valve assembly of first hydraulic control unit and second hydraulic control unit from the hydraulic fluid supply source, described first hydraulic control unit is a fork positioner that is used for crane vehicle, described second hydraulic control unit is a side shifter that is used for crane vehicle, and this assembly comprises:

A) valve body, this valve body defines:

I) supplying mouth that is communicated with described supply source fluid;

Ii) first operator port that is communicated with the described first hydraulic control unit fluid;

Iii) second operator port that is communicated with the described second hydraulic control unit fluid;

Iv) chamber, this chamber is communicated with described supplying mouth, first operator port and the second operator port fluid;

B) selector valve that is arranged in described chamber, this selector valve is operable in primary importance and described hydraulic fluid the second place when being in second pressure of described hydraulic fluid when being in first pressure, wherein in described primary importance, described selector valve realizes that between described supplying mouth and described first operator port fluid is communicated with, in the described second place, described first selector valve realizes that between described supplying mouth and described second operator port fluid is communicated with;

Wherein said first pressure is lower than described second pressure.

Description of drawings

In the mode of example the present invention is described below with reference to accompanying drawings, wherein:

Fig. 1 is the schematic representation that is used for the hydraulic system of crane vehicle;

Fig. 2 is the stereogram according to the valve assembly of a preferred embodiment of the present invention;

Fig. 3 is the sectional view that is used for the valve body of preferred embodiment shown in Figure 2;

Fig. 4 is the stereogram that is used for the selector valve of preferred embodiment shown in Figure 2;

Fig. 5 A is that preferred embodiment shown in Figure 2 is in the sectional view that the primary importance that fluid flows along a direction is shown;

But being preferred embodiment, Fig. 5 B is in the opposite sectional view of primary importance direction of flow shown in Fig. 5 A;

Fig. 5 C is that preferred embodiment shown in Figure 2 is in the second place, shows the sectional view that fluid flows along a direction;

But being preferred embodiment, Fig. 5 D is in the opposite sectional view of second place direction of flow shown in Fig. 5 C; And

Fig. 6 is the schematic representation that preferred embodiment and the side shifter of Fig. 2 links to each other with fork positioner.

Embodiment

Fig. 1 has illustrated the crane vehicle hydraulic system that links to each other with valve assembly 10 according to the preferred embodiment of the invention.Valve assembly 10 is connected to control panel 11 by the first hydraulic pressure supply pipeline 12 and the second hydraulic pressure supply pipeline 14.Control panel 11 is connected to hydraulic fluid tank 16 by a jar supply pipeline 18 and a jar return pipeline 20.A pump (not shown) is connected to jar supply pipeline 18, so that pressurized hydraulic fluid is provided.

Referring again to Fig. 1, control panel 11 comprises oil hydraulic circuit 26, and this loop is connected to the first and second hydraulic pressure supply pipelines 12 and 14 with jar supply pipeline and return pipeline 18 and 20 interchangeably.Working in a conventional manner in loop 26, therefore no longer is described further.

Loop 26 is connected to three control corresponding bars in the lift truck cab with hydraulic way.Also can adopt other similar loop to control other vehicle functions, such as prypole inclination, support lifting or the like.For simplicity, only illustrated to operate the controlling rod 28 of this particular loop 26 in the drawings.Those of ordinary skill in the art will appreciate that, the actuator of other type can be provided.

Referring now to Fig. 2,, valve assembly comprises valve body (valve block) 30, and it is box-like preferably.First supplying mouth 32 and second supplying mouth 34 are arranged in the valve body 30.First and second supplying

mouths

32,34 are communicated with the first and second hydraulic pressure supply pipelines, 12,14 (see figure 1)s respectively.Preferably, supplying

mouth

32,34 is arranged on the same one side of valve body 30.An orifice valve 35 (seeing Fig. 5 A-5D) preferably is arranged between supplying mouth 32 and 34.The effect of this orifice valve is discussed below.Preferably, the diameter of this orifice valve can be about 0.043 inch.

Referring now to Fig. 3,, in valve body 30, is provided with first chamber 36 and second chamber 38.First and

second chambers

36,38 are communicated with first and second supplying

mouths

32,34 through first and second block channels 40,42.

Referring to Fig. 3, in valve body 30, be provided with four operator port once more.Preferably, first operator port 44 and second operator port 46 are positioned on the face of seat 30, and the 3rd operator port 48 and the 4th operator port 50 are positioned on the opposing side of seat 30.First and

second operator port

44 and 46 are communicated with first chamber 36.Third and

fourth operator port

48,50 is communicated with second chamber 38.

Referring now to Fig. 6.The first and the

3rd operator port

44,48 is connected to corresponding mouthful (not shown) of the first conventional hydraulic control unit 80.First hydraulic control unit can be for example to pitch the location cylinder body.The second and the

4th operator port

46 and 50 is connected to corresponding mouthful (not shown) of second hydraulic control unit 80.Second hydraulic control unit can be a side shifting cylinder body for example.

Referring again to Fig. 3.In valve body 30, be provided with a path of navigation 52.Path of navigation 52 is communicated with first and second chambers 36,38.Path of navigation 52 also is communicated with first and second block channels 40,42, and the three 54 converges in the point of intersection.As Fig. 5 A-5D signal, a two-way valve 56 is arranged on this 54 places, point of intersection.Preferably, two-way valve is conventional ball formula reciprocable valve (ball andshuttle valve).Two-way valve optionally couples together path of navigation 52 and block channels 40 or block channels 42.

Referring now to Figure 4 and 5 A-D,, the first conventional selector valve 60 is arranged in first chamber 36, and the second conventional selector valve 61 is arranged in second chamber 38.Preferably, selector valve the 60, the 61st is identical.Preferably, such valve can be buied from a plurality of valve supplier.A useful example is the valve (model PD10-40) that Hydraforce company sells.First selector valve 60 comprises the columniform valve casing 62 that is roughly that is installed in first chamber 36.Cylindrical valve casing 62 has the open end of close path of navigation 52, and defines an internal valve chamber 64.Cylindrical valve casing 62 also have a plurality of radial fingers to the opening 65 that circumferentially is provided with of edge so that and first chamber 36 be communicated with.A movement of valve body (valve body) 66 is arranged in the valve chamber 64 of valve casing 62.Valve body 66 has the pressure surface 68 of the open end that is adjacent to valve casing 62.Valve body 66 has the narrower part that defines an annular space 69.Radial finger to opening 65 be communicated with annular space 69 between valve body 66 and the valve casing 62.Valve body 66 is connected to the spring 74 of a closed end that is arranged in cylindrical valve casing 62.By extrusion spring 74, valve body 66 can move with respect to valve casing 62.Spring 74 is biased to the position shown in Fig. 5 A and the 5B with valve body 66.Preferably, spring resistance is configured to make need applies 315PSI or bigger pressure on pressure surface 68, so that extrusion spring 74, thereby valve body 66 can move to the position shown in Fig. 5 C and the 5D.

A plurality of outside

O shape rings

70,72 are provided for the each several part that the each several part of first selector valve 60 is sealed in the wall of first chamber 36.A plurality of inner O shape rings (not shown) also are provided,, have released to avoid the fluid between valve body 66 and the valve casing 62 so that the top and bottom of annular space 69 and the remaining part of valve chamber 64 are separated.

Second selector valve 61 is identical with first selector valve 60, therefore no longer it is specified.

Referring now to Fig. 6,, the operation according to valve assembly 10 of the present invention is described.For simplicity, hereinafter with conventional hydraulically operated fork positioner 80 and side shifter 82 operation of the present invention is described in conjunction with crane vehicle.Should partly describe, first hydraulic control unit is a fork positioner, and second hydraulic control unit will be a side shifter.Those of ordinary skill in the art will be understood that the present invention can utilize any two the hydraulic control unit work that need different pressures, and is not limited to fork positioner and side shifter, perhaps the hydraulic control unit used of crane vehicle.Described Effector can be used as any needed function, for example rotates, inclination, clamping or similar function.

Referring to Fig. 1, when lift truck operator wishes to start fork positioner along first direction, when fork was narrowed, these operator were along mobile (partial journey) controlling rod 28 of the non-whole process of direction.Loop 26 is partly started, so as with hydraulic fluid from hydraulic fluid tank 16 along jar supply pipelines 18, through part 22, offer the first hydraulic pressure supply pipeline 12 then.Start because loop 26 is parts, the flow velocity of the hydraulic fluid in the first hydraulic pressure supply pipeline 12 is lower, thereby has produced low pressure hereinafter described.Preferably, low pressure means that pressure is lower than 315PSI.

Referring now to Fig. 5 A,, hydraulic fluid enters first supplying mouth 32, and flows into first path 40.The pressure of fluid in first block channels 40 moves to a permission with two-way valve 56 and is realizing between first block channels 40 and the path of navigation 52 that fluid is communicated with, cuts off simultaneously the position of the connection between second block channels 42 and the path of navigation 52.The pressure of fluid in path of navigation 52 acts on the pressure surface 68 of each selector valve 60,61.Because pressure is lower than 315PSI, the valve body 66 of

selector valve

60,61 is all no longer mobile.Correspondingly,

selector valve

60 and 61 annular channels are aimed at first operator port 44 and the 3rd operator port 48 respectively.Accommodating fluid in first block channels 40 also the radial finger in the cylinder blanket 62 of first selector valve 60 to opening 65 enter annular space 69.Fluid flows out to the annular space 69 of opening 65 from first selector valve 60 through other radial finger, and enters first operator port 44.The inside O shape ring of O shape ring 70 and selector valve 60 avoids fluid to enter second operator port 46.

Referring to Fig. 6, the hydraulic fluid warp walks to fork positioner 80 with the pipeline 84 that first operator port 44 links to each other.Make fork when narrowing when this fork positioner is activated, hydraulic fluid also leaves

fork positioner

80, and 86 enters the 3rd operator port 48 by the road.Fluid flows to second block channels 42 through second selector valve 61, but its mode is reverse with the similar of first selector valve 60.Fluid leaves valve assembly 10 at second supplying mouth 34 along second supply pipeline 14.

Referring now to Fig. 1,, fluid walks to loop 26 along the second hydraulic pressure supply pipeline 14, and is directed in jar return pipeline 20, thereby finishes once circulation.

If the manipulator wishes fork is relaxed, operator move the non-in opposite direction whole process of controlling rod 28 (partial journey), loop 26 is partly started, thereby part 24 is used, low-pressure fluid flow is directed to the second hydraulic pressure supply pipeline 14 from hydraulic fluid charging-tank 16.

Referring now to Fig. 5 B,, hydraulic fluid enters valve body 30 through second supplying mouth 34, enters second block channels 42 then.Two-way valve 56 moves along other direction, makes it become second block channels 42 and realizes being communicated with path of navigation 52.Because it is low-pressure fluid,

selector valve

60 and 61 valve body 66 are not all removed from the position shown in Fig. 2 B.But, hydraulic fluid second selector valve 61 of flowing through, its mode is identical with first selector valve 60.Hydraulic fluid flows out the 3rd operator port 48, and flows into pipeline 86 and arrival fork positioner 80.This makes fork positioner work in opposite direction.

Enter valve assembly 10 from the hydraulic fluid of fork positioner 80 outflows and inflow pipeline 84 in first operator port 44.Returning fluid imports first path 40 by first selector valve 60, as mentioned above.Fluid flows out from first supplying mouth 32, and returns jar return pipeline 20 through first supply pipeline 12.Like this, to which side shifting controlling rod 28, will cause fork positioner 80 to move (that is, narrow or relax fork at interval) along corresponding that direction.

Referring to Fig. 1, if lift truck operator wishes to start side shifter along a direction, these operator are omnidistance mobile with controlling rod 28 along first direction.Loop 26 starts fully, and fluid is sent to first supply pipeline 12 from jar supply pipeline 18 through part 22.Startup fully to loop 26 causes high pressure occurring in first supply pipeline 12.Preferably, high pressure means that pressure is 315PSI or higher.

Referring to Fig. 5 C, hydraulic fluid along with describe fork positioner narrow function the time identical path enter first chamber 36.In addition, now for the fluid of high pressure enters path of navigation 52, and act on the surface 68 of each valve body 66 of selector valve 60 and 61.Because act on pressure on the pressure surface 68 of each valve body 66 greater than the resistance of spring 74 separately in path of navigation 52, valve body 66 extrusion springs 74 of each selector valve move.This moves to the position shown in Fig. 5 C and the 5D with valve body 66, makes flow through annular space 69 and enter second operator port 46 of fluid in the block channels 40 of winning thus.O shape ring 72 stops and is communicated with the fluid of first operator port 44.Correspondingly, hydraulic fluid flows to side shifter 82 along pipeline 88.Hydraulic fluid is along pipeline 90, return the 4th operator port 50 through selector valve 61 then.The fluid valve body 30 of flowing through flows out through second supplying mouth 34 then, and its mode is with above similar.Fluid is according to above narrowing the described same way as hydraulic return of function fluid tank for fork positioner.

If lift truck operator wishes to start in opposite direction side shifter, these operator with controlling rod 28 omnidistance moving, have adopted part 24 thus, thereby have started high-pressure flow as indicated above in opposite direction.Shown in Fig. 5 D, as above to fork positioner to relax function described, the flow through path of system of high pressure hydraulic fluid is reversed.The valve assembly operation is as indicated above.

Preferably, hydraulic control unit is realized required function in can be under working in different pressures.Herein, a pressure is called low pressure, and another pressure is called high pressure.Certainly, absolute value is variable in the scope of broad.But preferably, these two pressure differ about 50PSI.For example, in a crane vehicle, can utilize less than the pressure of 250PSI and successfully realize the fork location, can utilize simultaneously greater than the pressure of 325PSI and realize side shifting.Other pressure and other pressure difference also are feasible, and this depends on vehicle and controlled implementation condition.High pressure in the supply pipeline 12 and 14 is by controlling rod 28 is obtained along the position that required direction is advanced to standard-sized sheet fast.When controlling rod was moved, through the Peak Flow Rate appearance of control panel 11, and pressure was accumulated in supply pipeline 12 or 14 fast.If fork is loaded, can produce resistance to the mobile of fork location cylinder body.Therefore, pressure accumulates fast.When it took place, pressure was accumulated in the valve body 30 fast, and valve body 30 moves selector valve 60 and 61, and is as indicated above.Then, this has brought hydrodynamic pressure completely on the side shifting cylinder body, to realize required side shifting.If fork is not loaded, the initial tendency of fluid may be to flow to fork positioner so.But this will be minimal, because comprehensively fluid flows and will carry out through control panel 11, and hydrodynamic pressure accumulation very apace, to cause the motion of selector valve 60 and 61.

When needs are pitched the location, controlling rod on required direction only partial journey move (non-whole process).Obtainable initial fluid pressure is always lower at control panel 11 places, in any case and only occur restricted mobile.This restricted flowing with the form appearance of low pressure, the fluid that therefore arrives valve assembly 10 is under the low pressure.Because fork location occurs in fork when not being loaded, fork can utilize such low pressure to move.Like this, restricted fluid continues along with moving of fork to flow, and pressure is not accumulated in supply pipeline 12 or 14 or in the valve body 30.This means that then

selector valve

60 and 61 rests in the initial position shown in 2A and 2B under spring 74 applied pressures, the fork location continues to carry out according to needed time along required direction.

Can provide orifice valve 35 to reduce any shock effect that may cause by the flip-flop of fluid flow direction.

Aforesaid the preferred embodiments of the present invention are configured to provide selectable and are moved by the two-way of hydraulic starting.But some hydraulic control unit may only need unidirectional moving.The return movement of hydraulic control unit can be originated by other, be provided such as spring or gravity.For such hydraulic control unit, second supplying mouth 34, second block channels, 42, the second selector valves 61, two-way valve 56, and third and

fourth operator port

48 and 50 can be omitted.

The present invention can adopt other concrete form to realize, and can not depart from its marrow or key character.Therefore, presently disclosed embodiment is considered to schematic and nonrestrictive, scope of the present invention by accompanying Claim but not the specification of preamble limit, all changes that occur in the implication of claims and full scope of equivalents all are considered to be contained by it.

Claims

1. one kind optionally is transported to one of them hydraulic valve assembly of first hydraulic control unit and second hydraulic control unit with hydraulic fluid from the hydraulic fluid supply source, and this assembly comprises:

A) valve body, this valve body defines:

Wherein said first pressure is lower than described second pressure.

2. the assembly of claim 1, it is characterized in that, also comprise the actuator that operationally links to each other with described supply source, this actuator can be at first actuator position that described hydraulic fluid is transported to described first supplying mouth with first pressure, described hydraulic fluid is transported to second actuator position of described first supplying mouth with second pressure, described hydraulic fluid is transported to the 3rd actuator position of described second supplying mouth and with second pressure described hydraulic fluid is transported between the 4th actuator position of described second supplying mouth with first pressure and optionally move, the described first and the 3rd actuator position allows moving back and forth of described first hydraulic control unit, and the described second and the 4th actuator position allows moving back and forth of described second hydraulic control unit.

3. the assembly of claim 2, it is characterized in that, when described actuator is in described first and second positions, described hydraulic fluid is returned to described supply source from described second supplying mouth, when described actuator was in described third and fourth position, described hydraulic fluid was returned to described supply source from described first supplying mouth.

4. the assembly of claim 3 is characterized in that, described actuator comprises the controlling rod that is connected in an oil hydraulic circuit.

5. the assembly of claim 4 is characterized in that, described controlling rod can move along two opposite directions by the mid point when being in position of rest, and wherein at described first actuator position, described controlling rod is in along the partial journey of a direction; At described the 3rd actuator position, described controlling rod is in along a rightabout partial journey; At described second actuator position, described controlling rod is in the whole basically stroke along a described direction; At described the 4th actuator position, described controlling rod is in along described rightabout whole basically stroke.

6. the assembly of claim 1, it is characterized in that, described valve body defines a path of navigation, this path of navigation is communicated with described first chamber, described second chamber and one of described first supplying mouth and described second supplying mouth fluid, moves under the pressure effect of described first and second selector valves in described path of navigation.

7. the assembly of claim 6, it is characterized in that, described valve body defines one first and second block channels, and described first block channels is extended between described first supplying mouth and described first chamber, and described second block channels is extended between described second supplying mouth and described second chamber.

8. the assembly of claim 7, it is characterized in that, also comprise a two-way valve that is arranged on the place, point of intersection of described path of navigation, first block channels and second block channels, in the time of in described hydraulic fluid flows into described first supplying mouth, this two-way valve forms fluid and is communicated with between described first block channels and described path of navigation; In the time of in described hydraulic fluid flows into described second supplying mouth, this two-way valve forms fluid and is communicated with between described second block channels and described path of navigation.

9. the assembly of claim 8 is characterized in that, described two-way valve comprises a ball formula reciprocable valve.

10. the assembly of claim 8 is characterized in that, described first selector valve comprises:

A) valve casing, this valve casing define the open end and a relative closed end that are adjacent to described path of navigation, and described valve casing defines an internal valve chamber that is communicated with described open end;

B) valve body that is accommodated in movably in the described internal valve chamber, this valve body defines a pressure surface that is adjacent to the open end of described internal valve chamber, moves to the described second place from described primary importance under the pressure effect on the pressure surface of acting on of wherein said valve body in described path of navigation; And

C) biased member that promotes described valve body to described primary importance.

11. the assembly of claim 10 is characterized in that, described biased member is positioned at the closed end of described valve casing.

12. the assembly of claim 11 is characterized in that, described biased member comprises a spring.

13. the assembly of claim 12 is characterized in that, needs a 315PSI or bigger pressure to act on the described pressure surface, to overcome the resistance of described spring.

14. the assembly of claim 13 is characterized in that, described valve casing defines the opening that a plurality of edges circumferentially are provided with.

15. the assembly of claim 14 is characterized in that, described second selector valve is identical with described first selector valve basically.

16. the assembly of claim 8 is characterized in that, described first hydraulic control unit is a fork positioner that is used for crane vehicle, and described second hydraulic control unit is a side shifter that is used for crane vehicle.

17. the assembly of claim 12 is characterized in that, described valve body is a box-like, and described valve body defines a first surface, second surface and the 3rd surface.

18. the assembly of claim 17 is characterized in that, described first and second supplying mouths are positioned at described first surface, and described first and second operator port are positioned at described second surface, and described third and fourth operator port is positioned at described the 3rd surface.