WO2016012240A1

WO2016012240A1 - Built-in hydraulic valve and hydraulic control arrangement

Info

Publication number: WO2016012240A1
Application number: PCT/EP2015/065571
Authority: WO
Inventors: Georg Hofmann; Hubert Feser
Original assignee: Robert Bosch Gmbh
Priority date: 2014-07-22
Filing date: 2015-07-08
Publication date: 2016-01-28
Also published as: DE102014214176A1; TW201610305A

Abstract

Disclosed is a built-in hydraulic valve comprising a valve bore in which a valve body is accommodated in such a way as to be axially movable. The built-in valve allows a pressurized medium connection between the pressurized medium inlet and the pressurized medium outlet of the valve to be controlled. The valve body is at least partly force-balanced. In order to control the pressurized medium connection, the valve body includes two pressure surfaces that can be subjected to a control pressure which is smaller than the operating pressure applied to the pressurized medium inlet. Also disclosed is a hydraulic control arrangement comprising a built-in hydraulic valve of said type.

Description

HYDRAULIC INSTALLATION VALVE AND HYDRAULIC CONTROL ARRANGEMENT

description

The invention relates to a hydraulic cartridge valve according to the preamble of patent claim 1 and a hydraulic control arrangement according to the

Claim 1 1.

Built-in valves are designed for a compact block design, hydraulic elements. A main stage of a cartridge valve has a pressure medium input and a pressure medium output and is in a mostly standardized receiving bore in a

Control block can be used. Usually, an interface of a control pressure chamber of the main stage with control components is formed via a closure cover of the cartridge valve. By different control concepts, the main stage can fulfill a pressure valve, a directional control valve, a check valve or a throttle valve function or represent a combination of these functions.

A generic, hydraulic cartridge valve is shown for example in the data sheet RD 21040/1 1 .10 the applicant. The valve body / piston accommodated in a valve bore or piston bore has an in

Opening direction of the pressure medium connection of the pressure medium input and

Druckmittelausgangs effective first pressure surface, one of these in the closing direction counteracting second pressure surface and one for controlling the

Pressure medium connection provided on the third pressure surface. The first two

Pressure surfaces are acted upon by the pressure medium input pending, comparatively high operating pressure, which serves to balance the force on the valve body. The third pressure surface is located as an annular end face on a radial collar in an area between the two first pressure surfaces.

A disadvantage of this solution is that the operating pressure at the pressure medium input via a multi-part pressure medium channel with a correspondingly high number of sealing areas must be transmitted to the limited by the closing second effective pressure chamber pressure chamber. That represents a considerable

In addition, the valve cover in the region of this pressure chamber occlusive housing cover with all its components, such as seals, lag screws, etc., on the relatively high

Operating pressure must be designed. This is the more disadvantageous the higher the

Operating pressure is. In particular, high-pressure applications of the cartridge valve at pressures above 500 bar then prove to be costly.

In contrast, the invention has the object to provide a hydraulic cartridge valve having a reduced device complexity. Furthermore, the invention has for its object to provide a hydraulic control arrangement so.

This first object is achieved by a hydraulic cartridge valve having the features of patent claim 1, the second object is achieved by a hydraulic control arrangement having the features of patent claim 11.

Advantageous developments of the are described in the dependent claims.

A hydraulic cartridge valve, in particular designed as a 2/2-way cartridge valve, in particular as a switching valve, has a closed by a closure device, in particular by a housing cover, valve bore or

Piston bore. This is preferably formed in a valve housing of the cartridge valve. In the valve bore, a valve body, in particular a valve piston, received axially displaceable, via which a pressure medium connection, preferably between a pressure medium input and a pressure medium output of the cartridge valve, is controllable. On the valve body four pressure surfaces are provided. A first is effective when pressure medium in the opening direction of the pressure medium connection and a second in the closing direction. Both pressure surfaces are fluidically connected to one another and with an operating pressure of the pressure medium connection, preferably at

Pressure medium input or output is pending, acted upon, in particular

applied. The valve body is thus at least partially force-balanced via the two pressure surfaces mentioned, so that a control force for controlling the pressure medium connection can be smaller. To generate this control force are on the valve body two additional pressure surfaces, hereinafter third and fourth

Called pressure surface provided, which are acted upon with respect to the operating pressure, lower pressure, for example, a control pressure, low pressure or tank pressure, in particular acted upon. When Druckmittelbeaufschlagung the third pressure surface in the closing direction and the fourth pressure surface in the opening direction is effective. According to the invention is a third pressure chamber of the cartridge valve, which is limited in sections by the third pressure surface, as well as the

Closing device limited in sections.

In the area of the closure device is thus the low pressure

having arranged third pressure chamber and not one the operating pressure

having pressure chamber, as in the prior art. This has the advantage that the closure device and other components, such as lag screws for fastening the closure device, seals for sealing an opening of the valve bore or pressure relief valves for pressure protection of the third

Pressure chamber, not on the relatively high operating pressure, but can be designed for the lower control pressure. It can then device-simpler and thus cheaper components are used. The built-in valve thus realized is therefore simplifies device technology and cheaper

designed. This results in the advantage that a reduction in the number of components is possible, since installation valves for various operating pressures with the same components can be built. This allows the implementation of a

Modular principle, which in addition the development effort and, for example, storage costs and the like can be reduced. Preferably, the cartridge valve is designed such that it can be inserted or installed in a valve block or a valve disc. The insertion, installation can be realized for example via a screw with the valve block or the valve disc.

The insert valve proves to be particularly advantageous for use in the high-pressure range at operating pressures of approximately above 500 bar, in particular up to approximately 1000 bar. The higher the operating pressure, the larger the one

Device-technical and cost-technical advantage of the invention

Built-in valve, since this is then controlled in spite of the high operating pressure on low pressure, in particular standardized, components controllable or vorsteuerbar.

Use finds the cartridge valve, for example, in a hydraulic press drive or in a hydraulic test bench, in the hydraulic

Components to the multiple, for example, 3 times their nominal or

Operating pressure can be tested.

In a preferred development, the first pressure surface is at least

formed in sections on a first end face of the valve body.

In a preferred embodiment, the third pressure surface is at least

partially frontally, on a different front side than the first pressure surface formed ..

At least in sections means for the mentioned printing surfaces, that a portion of the respective printing surface can be arranged with respect to the end side reset.

Preferably, the fourth pressure surface is formed in the axial direction between the first and second pressure surface. In a preferred embodiment, the valve body has a radially expanded collar, on which the second pressure surface, in particular as an annular end face is formed.

In a preferred development, the fourth pressure surface is additionally formed on the radially expanded collar, in particular on another annular end face of the collar.

Over a margin of the first pressure surface, a valve seat is preferably formed in cooperation with a seat surface of the cartridge valve, via which the

Pressure medium connection up and is zuusteuerbar. The design as a seat valve has the advantage that the pressure medium connection is substantially leak-free zusteuerbar.

In a preferred embodiment, the valve body of a

Pressure medium passage penetrated, which opens on the one hand in a section of the first pressure surface limited first pressure chamber and on the other hand in a partially bounded by the second pressure surface, the second pressure chamber. The valve body is thus designed like a sleeve. An advantage of this is that unlike the prior art, the pressure medium of the second pressure chamber, ie the second pressure surface, no multi-part, multiple sealed, external

Pressure medium channel must be done, but instead leak-free, device technology simple and easy to manufacture done by the formed in the valve body pressure medium channel. This represents a considerable device and manufacturing simplification not only for the cartridge valve but also for its installation environment.

Preferably, the pressure medium channel opens into the second pressure chamber via substantially star-shaped radial bores of the valve body.

In a preferred embodiment, the second pressure surface is smaller than the first pressure surface formed.

In a preferred refinement, the third pressure chamber can be fluidly connected to a control pressure medium source, in particular connected and in sections The fourth pressure chamber delimited by the fourth pressure surface is permanently connected fluidly to a pressure medium sink or a low pressure level, in particular to a tank, in particular connected. As force relevant in the opening direction, the pressure force acting on the first pressure surface is then essentially effective. In this development, the cartridge valve is pressurized

Pressure limiting valve formed, via which the pressure medium connection is controllable in only one flow direction. The pressure reduction takes place between the pending on the first pressure surface operating pressure and the pending on the third pressure surface pressure or control pressure. In other words, only a low pressure or control pressure is necessary to secure the operating pressure due to the construction of the cartridge valve according to the invention.

That the pressure required for controlling the pressure medium connection, in particular the pressure or control pressure required to close the pressure medium connection in the third pressure chamber, can be lower than the operating pressure, is realized in a preferred development in that a surface difference of the first and second pressure surface and the third pressure surface are suitably matched to each other. In this case, the third pressure surface is preferably larger, in particular significantly larger, than this surface difference. The larger the third pressure area, the lower the pressure or control pressure can be selected.

In an alternative preferred development, the third pressure chamber and a fourth pressure chamber delimited in sections by the fourth pressure surface is

Adjustment of the respective pressure in the third and in the fourth pressure chamber - and thus to close and open the pressure medium connection - alternately with a

Control pressure medium source and fluidically connected to a pressure medium sink.

Alternatively, here means that when the third pressure chamber with the

Control pressure medium source is connected, the fourth pressure chamber is connected to the pressure medium sink, and vice versa. In this development, the cartridge valve as

Directional valve formed over the pressure medium connection in two

Flow directions is controllable. In a preferred refinement, a surface difference between the first pressure surface and the second pressure surface and the fourth pressure surface are dimensioned in such a way that the pressure in the fourth pressure chamber to open the

Pressure medium connection required pressure or control pressure may be lower than the operating pressure.

In a preferred embodiment, the pressure surfaces are dimensioned such that a pressure ratio of the pressure or control pressure to the operating pressure is about 1/2 to about 1/3.

Preferably, the pressure surfaces are dimensioned such that the pressure or control pressure is in the range of a, in particular standardized, hydraulic pressure stage, in particular at approximately 340 bar. Then, a system or system pressure already present in the system can easily be used to control the cartridge valve (the fluid connection) without having to provide a special control fluid source.

A hydraulic control arrangement according to the invention has, for the control of a pressure medium connection, a built-in valve which is designed at least according to one of the aspects of the preceding description. In addition, the control arrangement has a control pressure medium source to which at least the third pressure chamber can be fluidically connected, in particular connected.

In a preferred embodiment, the control arrangement has a

Valve device which is fluidly connected to the third pressure surface of the cartridge valve, in particular connected. The valve device is designed such that the pressure or control pressure in the third pressure chamber of the cartridge valve

limited, in particular limited. Preferably, the third pressure chamber via the valve device to limit its pressure fluidly connected to a pressure medium sink. Preferably, the valve device is formed via a pressure relief valve. Its pressure medium input is then connected to the third pressure chamber and its pressure medium outlet is connected to the pressure medium sink, in particular to the tank, in particular connected. About such a hydraulic Control arrangement is a so-called pressure limiting function is formed, in which the pressure relief valve acts as a hydraulic spring. Due to the nature of the pressure surfaces, a hydraulic pressure reduction between the operating pressure and the pressure in the third pressure chamber is created. According to the invention, the

Valve device be designed to the discussed, lower pressure level, which brings about the advantages already mentioned.

In an alternative or additional refinement, the control arrangement has a valve device which is configured such that the respective pressure or control pressure in the third pressure chamber and in the fourth pressure chamber can be adjusted via it to control the pressure medium connection. For this purpose, the valve device preferably has a directional control valve, via which the third one is connected to close the pressure medium connection

Pressure chamber with the control pressure medium source and the fourth pressure chamber with the

Pressure medium sink is connectable, and via the opening of the pressure medium connection of the third pressure chamber with the pressure medium sink and the fourth pressure chamber with the control pressure medium source is connectable.

In a preferred embodiment, the control arrangement has both valve devices mentioned, which are fluidically connected in parallel with the third pressure chamber.

Preferably, the valve devices are or are integrated in the closure device, in particular in the housing cover of the installation valve, whereby a compact design of the hydraulic control arrangement is given.

Preferably, the control pressure medium source is formed by a hydraulic pump or a hydraulic accumulator.

For damping fluctuations of the control pressure in the third or fourth pressure chamber, and thus for stabilizing the control behavior of the cartridge valve, is connected to a pressure medium flow path connecting the third pressure chamber or the fourth pressure chamber to the valve device and / or the control pressure medium source

preferably arranged a throttle or nozzle. Two exemplary embodiments of a hydraulic control arrangement according to the invention with a built-in valve according to the invention are explained in more detail below with reference to two figures. Show it:

Figure 1 shows a first embodiment of a hydraulic control arrangement with a cartridge valve with pressure relief valve function, and

Figure 2 shows a second embodiment of a hydraulic control arrangement with a cartridge valve with directional valve function.

A hydraulic control arrangement 1 according to FIG. 1 has a built-in valve 2, a control-pressure-medium source 4 designed as a fixed-displacement pump, and a tank T

trained pressure medium sink and designed as a pressure relief valve valve device 6. The control arrangement 1 is used to control a

Pressure medium connection of a pressure medium input 8 with a pressure medium output 10 of the cartridge valve 2. At the pressure medium input 8 is in the illustrated embodiment, an operating pressure p of 1000 bar (high pressure area).

The cartridge valve 2 has a valve housing 12, in which a multi-stepped, designed as a piston bore valve bore 14 is introduced. In this is a stepped, designed as a valve piston valve body 16 received axially displaceable. An opening 18 of the valve bore 14 is formed by a housing cover

Locking device 20 pressure-sealed.

With respect to its longitudinal axis 22, the cartridge valve 2, that is their

Housing cover 20, valve housing 12, valve body 16 and a socket 24 of the

Built-in valve 2, at which the pressure medium input 8 and the pressure medium output 10 are formed, rotationally symmetrical.

Starting from the opening 18, the valve bore 14 extends in the direction of the longitudinal axis 22 cylindrical, stepped. A pin-shaped end portion 26 defines together with the valve bore 14 and the housing cover 20 as a

Control pressure chamber formed third pressure chamber 28. In the direction of the sleeve 24, the valve bore 14 has a radial extension, in which also a radially expanded Control collar 30 of the valve body 16 is received axially displaceable. Of the

Steuerbund 30 additionally fulfills a guiding function of the valve body 16 in the radial extension of the valve bore 14. The control collar 30 Von einer am

Control collar 30 designed as an annular end face, second pressure surface 32, a

Inner lateral surface of the radial extension of the valve bore 14 and a

Outer surface of the end portion 26, a second pressure chamber 34 is limited. From one of the bush 24 facing, also designed as an annular end face, fourth pressure surface 36 of the control collar 30, an outer circumferential surface of the valve body 16, the inner circumferential surface of the radial extension of the valve bore 14 and a

Ring end face of the sleeve 24 is a fluidically connected to the tank T, fourth pressure chamber 38 limited.

The valve housing 12 has on the bushing side a centering collar 40, which is interspersed on the one hand by the valve bore 14, more precisely by its radially expanded portion. For receiving the bush 24, an additional, radially enlarged bush receptacle 42 is formed on the centering collar 40, in which the bushing 24 is inserted axially displaceable. This axial displaceability serves to compensate for a small mounting clearance of the cartridge valve 2 in the axial direction.

About on the centering collar 40 and on the sleeve 24 radially outward, in

Fully formed grooves arranged seals 70 is a particularly effective and low leakage sealing of the pressure medium input 8 created.

The bush 24 is penetrated by a through-passage 44, in which a second end portion 46 of the valve body 16 is received and guided axially displaceable. At the end face on the second end section 46, the valve body 16 has a first pressure surface 48, via which a first pressure chamber 50, of which the pressure medium input 8 is formed, is partially delimited.

An edge of the first pressure surface 48 represents a seat edge 52, over which in

Cooperation with an inner seat or seat slope 54 of the sleeve 24, a valve seat is formed. About this is the pressure medium connection of the

Pressure medium input 8 with the pressure medium output 10 up and zuusteuerbar. The pressure medium output 10 is on the sleeve 24 via a plurality of radially extending from the through-hole and radially outwardly extending

Connection bores formed.

The valve body 16 is traversed along the longitudinal axis 22 by a predominantly axially extending pressure medium channel 56, which on the one hand has an orifice in the first pressure surface 48, and on the other hand opens with a plurality of radially arranged radial bores in the second pressure chamber 34. Thus, the operating pressure p is substantially at the second pressure surface 32 and the first pressure surface 48 at. Since the first pressure surface 48 in the opening direction of the valve body 16 and the second pressure surface 32 opposite in the closing direction is effective, so at least a partial force balance on the valve body 16 is created.

In the seat slope 54 of the valve body 16 is biased by a closing spring 58 with a comparatively low spring force. The closing spring 58 is arranged in the third pressure chamber 28 and axially supported on the one hand at the bottom of a blind recess of the housing cover 20 and on the other hand at the bottom of a blind recess of the end portion 26 of the valve body 16. The third pressure space 28 is of a at the end portion 26 of an annular end face and a bottom surface of the

Sacklochausnehmung formed, third pressure surface 60 limited. This is just like the closing spring 58 and the second pressure surface 32 in the closing direction of

Pressure fluid connection is effective.

For detecting a position of the valve body 16, in particular for detecting an open and / or closed position, the valve housing 12 is penetrated from radially outside by a through-bore formed as a sensor receptacle 62 which extends to the valve bore 14. The sensor receptacle 62 is provided for receiving an inductive sensor or another suitable sensor, via which the position of an edge 64 of the control collar 30 can be detected.

An advantage of the installation valve 2 according to the invention is that the sensor receptacle 62, in which the sensor 62 is arranged, in pressure medium connection with the depressurized fourth pressure chamber 38, so that the sensor used

Low pressure may be designed and not designed for high pressure.

In operation, the hydraulic control assembly 1 has the task, a

Pressure limiting function to meet. The pressure at the pressure medium input 8 should be limited to 1000 bar. In the opening direction of the pressure medium connection of

Pressure medium input 8 with the pressure medium output 10 then acts a force resulting from the product of the operating pressure p at the pressure medium input 8 and the

Area of the first pressure surface 48 results. In the closing direction acts a force F ₂ , which results as a product of the operating pressure p, which is reported via the pressure medium channel 56 in the second pressure chamber 34, and the surface area of the second pressure surface 32. However, since the second pressure surface 32 is formed smaller than the first pressure surface 48, the force acting in the closing direction F ₂ F _{2 would} not be sufficient to hold the valve body 16 on the seat slope 54. For this purpose, on the one hand to a slight extent the closing spring 58, on the other hand but mainly the control pressure p _S t in the third pressure chamber 28 is provided. This is supplied via the control pressure medium source 4 with pressure medium.

The pressure level, in particular the value of the control pressure p _S t, which must prevail in the third pressure chamber 28 in order to counteract the force Fi acting in the opening direction, a sufficient closing force F ₂ + F ₃ , is over

Pressure relief valve trained valve device 6 is set. For this purpose, the pressure medium input of the pressure limiting valve 6 is connected to the control pressure medium source 4 and to a housing cover 20 disposed on the control pressure medium connection 72 which is fluidly connected via a throttle 73 to the third pressure chamber 28.

The third pressure surface 60 selected comparatively large, whereby the control pressure Pst can be compared to the operating pressure p at the pressure medium input 8, comparatively low. In the embodiment shown that is

Pressure limiting valve 6 configured adjustable and set to the control pressure p _S t = 341 bar. The operating pressure p is 1000 bar. The larger the third pressure surface 60 is designed, the smaller the control pressures pst can be selected. It proves to be advantageous if the pressure level for the control pressure p _St an already in the hydraulic system (not shown periphery) existing pressure level is selected. Accordingly, the pressure surfaces 48, 32 and 60 are to be matched.

Compared with solutions of the prior art is thus by the arrangement of the control pressure chamber formed as the third pressure chamber 28 in the region of

Housing cover 20 ensures that this from the inside with the high

Operating pressure p, but with the comparatively low control pressure p _St

is charged. This of course also applies to sealing elements, such as the seal 66 shown in Figure 1, which seals the valve housing 12 and the housing cover 20, and tension screws 68, with which the housing cover 20 is fixed to the valve housing 12. In addition, unlike solutions known from the prior art, the components for generating and adjusting the control pressure, the hydraulic pump 4 and the pressure relief valve 6, as well as the necessary pressure medium channels and pressure medium lines, also not on the high pressure level (1000 bar) , but to the lower pressure level (341 bar) of the control pressure pst can be designed. This corresponds to a considerable device-technical simplification and a reduction in the cost of the cartridge valve 2 and the

Control arrangement 1.

The second exemplary embodiment of a hydraulic control arrangement 101 according to FIG. 2 corresponds predominantly to the first exemplary embodiment according to FIG. 1, for which reason the following description refers to the differences from the first embodiment

Embodiment limited. About the embodiments unchanged

Components are provided with the same reference numerals. The

Control arrangement 101 according to FIG. 2 differs from control arrangement 1 according to FIG. 1 in the type of valve device 106 and its connection. In the first embodiment, only the third pressure chamber 28 is connected to the control pressure medium source 4 of the pressure chambers and the valve means 6 is the

Control pressure p _St , and thus the pressure in the third pressure chamber 28, limited. As a result, the cartridge 2 can only work as a pressure relief valve and allows a Flow direction only from the pressure medium input 8 towards

Pressure medium output 10.

According to Figure 2, the valve means 106 is formed via a 4/2-way valve, to which the control pressure medium source 4, the pressure medium sink T, the control oil connection 72 and a control oil connection 75, which is connected via a throttle 77 to the fourth pressure chamber 38 connected. By way of a first switching position a, the third pressure chamber 28 can be fluidically connected to the control-pressure medium source 4 and the fourth pressure chamber 38 can be fluidically connected to the pressure-medium sink T. The switching position a corresponds in principle to the permanent pressure medium loading of the third and fourth pressure surface 60, 36, as shown in the first embodiment. By way of a second switching position b, conversely, the third pressure chamber 28 is connected to the pressure medium sink T and the fourth

Pressure chamber 38 fluidly connected to the control pressure medium source 4, whereby, in contrast to the first embodiment, the seat edge 52 regardless of

Operating pressure p from the seat slope 54 is active lift off. As a result, both flow directions are possible in the second embodiment. In the switching position a, as in the first embodiment, pressure medium only from the pressure medium input 8 to the pressure medium output 10 (see also Figure 1) flow, provided that in the first

Pressure chamber 50 Pending operating pressure p _{A is} sufficient to open the valve seat. In the switching position b, however, is a pressure medium connection in both directions - from the pressure medium input 8 to the pressure medium output 10 or from the pressure medium input 108 to the pressure medium output 1 10, or from the higher of the operating pressures p _A , PB towards the respective lower operating pressure p _B or p _A - allows , The

Built-in valve 102 then acts as a 2/2-way valve.

Disclosed is a hydraulic cartridge valve, in particular for

High pressure applications is suitable. A valve body provided for controlling a pressure medium connection is accommodated axially movably in a valve bore embodied in a housing part of the installation valve, an opening of the valve bore being closed by a housing cover. In this case, at least three pressure surfaces are formed on the valve body, of which a first in the opening direction and a second in the closing direction is effective. About the two pressure surfaces as a force balance on the valve body is possible, creating a for the displacement of the Valve body necessary force is low fails. The third pressure surface is acted upon by a control pressure to the valve body for controlling the

To move pressure center connection. According to the invention, a control pressure space delimited by the third pressure surface is also delimited by the housing cover. That is, the control pressure chamber is arranged in the region of the housing cover. On the other hand, those of the other two pressure surfaces are limited and with the higher

Operating pressure applied pressure chambers arranged further inside the cartridge valve.

Disclosed is also a hydraulic control arrangement with such a cartridge valve and a control pressure medium source.

LIST OF REFERENCE NUMBERS

1, 101 hydraulic control arrangement

2 hydraulic cartridge valve

4 control pressure medium source

6; 106 valve device

8th; 8, 108 pressure medium input

10; 10, 1 10 pressure medium output

12 valve housing

14 valve bore

16 valve body

18 opening

20 housing cover

22 longitudinal axis

24 socket

26 end section

28 third pressure chamber

30 tax code

32 second printing area

34 second pressure chamber

36 fourth printing area

38 fourth pressure chamber

40 centering collar

42 socket receptacle

44 through-hole

46 end section

48 first printing surface

50 first pressure chamber

52 seat edge

54 seat incline

56 pressure medium channel

58 closing spring

60 third printing area 62 through recess 64 edge

66 seal

68 lag screw

70 seal

72 Control oil connection 73 Throttle

75 Control oil connection 77 Throttle

P, PA, PB operating pressure

Pst control pressure

PT tank pressure

T tank

Claims

claims

1 . Hydraulic cartridge valve with one of a locking device (20)

sealed valve bore (14) in which a valve body (16) axially

is slidably received, via which a pressure medium connection is controllable, wherein the valve body (16) in an opening direction of the

Pressure medium connection effective, first pressure surface (48) and a in

Closing direction of the pressure medium connection effective second pressure surface (32) are provided, which can be fluidly connected to each other and with a

Operating pressure (p, p _A , PB) of the pressure medium connection can be acted upon, whereby the valve body (16) is at least partially force balanced, and wherein the valve body (16) in the closing direction of the pressure medium connection effective, third pressure surface (60), and in the opening direction of

Pressure medium connection effective fourth pressure surface (36) are provided, which can be acted upon to control the pressure medium connection with a lower pressure (p _S t, Ρτ), characterized in that a section of the third pressure surface (60) limited third pressure chamber (28) sections is limited by the closure device (20).

2. cartridge valve according to claim 1, wherein the first pressure surface (48) and the

third pressure surface (60) are at least partially formed on the front side of the valve body (16).

3. cartridge valve according to claim 1 or 2, wherein the second pressure surface (32) and the fourth pressure surface (36) on a radially enlarged collar (30) of the

Valve body (16) are formed.

4. cartridge valve according to one of the preceding claims, wherein the

Valve body (16) is penetrated by a pressure medium channel (56) which in a section of the first pressure surface (48) limited

first pressure chamber (50) and a section of the

second pressure surface (32) limited second pressure chamber (34) opens.

5. cartridge valve according to one of the preceding claims, wherein the

second pressure surface (32) is smaller than the first pressure surface (48).

6. cartridge valve according to one of the preceding claims, wherein the third

Pressure chamber (28) is fluidically connected to a control pressure medium source (4), and wherein a section of the fourth pressure surface (36) limited fourth pressure chamber is permanently fluidically connected to a pressure medium sink (T).

7. cartridge valve according to one of the preceding claims, wherein a

Surface difference of the first pressure surface (48) and the second pressure surface (32) and the third pressure surface (60) are dimensioned such that in the third pressure chamber (28) required for closing the pressure medium connection pressure (p _S t) is lower than the operating pressure (p).

8. cartridge valve according to one of claims 1 to 5, wherein the third pressure chamber (28) and a section of the fourth pressure surface (36) limited fourth pressure chamber alternately with a control pressure medium source (4) and a pressure medium sink (T) are fluidically connectable.

9. cartridge valve according to claim 8, wherein a surface difference from the first

Pressure surface (48) and the second pressure surface (32) and the fourth pressure surface (60) are dimensioned such that in the fourth pressure chamber (28) for opening the pressure medium connection required pressure (p _S t) is lower than that

Operating pressure (p _A , PB) -

10. cartridge valve according to one of the preceding claims, wherein the

Pressure surfaces (32, 36, 48, 60,) are dimensioned such that the pressure (p _S t) is approximately in a standard or standardized, hydraulic pressure range.

1 1. Hydraulic control arrangement with a cartridge valve (2), which is designed according to one of the preceding claims, and with a

Control pressure medium source (4), which is fluidically connectable at least with the third pressure chamber (28) of the cartridge valve (2; 102).

12. Control arrangement according to claim 1 1 with a valve device (6), which is designed such that on the pressure (p _St ) in the third pressure chamber (28) of the cartridge valve (2, 102) can be limited.

13. Control arrangement according to claim 1 1 or 12 with a valve device (106) which is designed such that via it to control the

Pressure medium connection of the pressure (p _S t, Ρτ) in the third pressure chamber (28) and in the fourth pressure chamber (38) is adjustable.