LFA 40 DBS2-7X/400/12
Manufacturer: Bosch Rexroth
Material #: R978909929
Model : LFA 40 DBS2-7X/400/12
***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth LFA 40 DBS2-7X/400/12 (R978909929) is a sophisticated way cartridge valve designed for pressure functions, suitable for various hydraulic applications. This pilot-operated valve comes in both seat and spool design configurations, tailored to fit standardized receiving holes according to DIN ISO norms and secured with a control cover. It features an integrated pilot control valve for manual or electrically proportional pressure adjustment, which can be mounted directly onto the control cover or as a separate pilot valve with mounting dimensions in line with DIN standards.
The LFA 40 DBS2-7X/400/12 allows for the realization of different pressure functions through the combination of cartridge valves and control covers. In its pressure relief function, it operates as a seat valve without an area difference at port B, utilizing a spring mechanism to maintain closure until the set pressure is reached. Upon reaching this pressure, the spool opens to limit the pressure at port A according to its characteristic curve.
For its pressure reducing function, this model adopts a spool valve design also without an area difference at port B. It ensures free flow from port B to port A when under the set performance limit and controlled pressure, closing upon reaching the set pressure to reduce it accordingly.
This model is available in various sizes and component series X, capable of handling maximum operating pressures up to bar levels. It includes features like manual pressure adjustment, directional valve unloading options (open or blocked), circulation circuit capabilities (open/blocked), and DB functions for both pressure relief and reduction. The versatility of this Bosch Rexroth cartridge valve makes it an essential component for efficient hydraulic systems requiring precise pressure management.
$1,452.00 USD
More are expected on April 23, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as April 23, 2025 when ordered in
This product is eligible for factory repair.
General
2-way cartridge valves for pressure functions are pilot-operated valves in seat or spool design. The power section designed as cartridge valve (1) is installed into a receiving hole standardized according to DIN ISO 7368 and closed with a control cover (2).
The pilot control valve (4) for manual or electrically proportional pressure adjustment is integrated into the control cover (2) or is installed on the control cover (2) as pilot valve with mounting dimensions according to DIN 24 340.
By combination of cartridge valves with the control covers, different pressure functions can be realized. .
Pressure relief function
The cartridge valve (1) for the pressure relief function (type LC . DB...) is designed as seat valve without area difference (no effective area at port B). The effective pressure at port A is directed via the pilot oil supply orifice (5) to the spring side (6) of the element. Under the pressure set at the pilot control valve (4), the spool (3) is pressure-compensated and closed by the spring force.
On reaching the set pressure, the spool (3) is opened and the pressure at port A is limited according to the pressure-flow characteristics.
Pressure reducing function
Rest position open
The cartridge valve for the pressure reducing function is designed as spool valve without area difference (no effective areas at port B).
As pilot control valve, identical cover types as for the pressure relief function are applied (type LFA..DB...).
The effective pressure at port A is directed via the pilot oil supply orifice to the spring side of the spool. Under the performance limit and the pressure set at the pilot control valve, the spool is pressure-compensated and retained in open position by the spring force to enable free flow from port B to port A.
On reaching the set pressure, the spool is closed and the pressure at port A is reduced according to the pressure-flow characteristics.
|
Size |
Pilot control valve |
manual pressure adjustment |
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|
16 to 32 |
40 to 63 |
80 and 100 |
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• |
• |
• |
with directional valve |
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|
• = available |
Position "a" |
Position "b" |
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Position "a" |
Position "0" |
Position "b" |
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Directional valve unloading |
open |
DB function |
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• |
M-3SE.6C... |
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|
DB function |
open |
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• |
M-3SE.6U... |
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|
• |
M-3SE.10C./... |
open |
DB function |
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|
• |
M-3SE.10U./... |
DB function |
open |
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|
open |
Circulation circuit |
|
blocked |
Cartridge valve is hydraulically blocked |
|
DB function |
Pressure relief function |
|
01 |
02 |
03 |
04 |
05 |
06 |
07 |
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|
LFA |
DBS |
‒ |
/ |
|
Type |
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|
01 |
Control cover LFA |
LFA |
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Size |
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|
02 |
NG 40 |
40 |
|
NG 50 |
50 |
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|
NG 63 |
63 |
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NG 80 |
80 |
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|
NG 100 |
100 |
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|
Version |
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|
03 |
With manual pressure adjustment, for electric unloading circuit |
DBS1) |
|
Adjustment type for pressure adjustment |
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|
04 |
Rotary knob |
1 |
|
Sleeve with hexagon and protective cap |
2 |
|
|
Lockable rotary knob with scale (H-locking according to automotive standard) |
3 |
|
|
Rotary knob with scale |
4 |
|
|
Component series |
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|
05 |
Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 2) |
7X |
|
Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) 3) |
6X |
|
|
Pressure rating (observe admissible pressure of the pilot control valve) |
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|
06 |
Set pressure up to 25 bar |
025 |
|
Set pressure up to 50 bar |
050 |
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|
Set pressure up to 100 bar |
100 |
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|
Set pressure up to 200 bar |
200 |
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|
Set pressure up to 315 bar |
315 |
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|
Set pressure up to 400 bar |
400 |
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|
Seal material |
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|
07 |
NBR seals |
no code |
|
FKM seals |
V |
|
| 1) For set-up of a directional seat valve | |
| 2) Component series 7X for sizes 40…63. | |
| 3) Component series 6X for sizes 80 and 100. |
General information on the ordering codes for control covers: Pilot control valves (maximum operating pressure)
|
Pilot control valve |
Control cover |
Maximum operating pressure in bar Y, T |
included in type |
separate order |
|||
|
Type |
Catalog sheet no. |
NG |
|||||
|
X |
at pressure control |
static |
|||||
|
DBD. 2 K2X/… 1) |
upon request |
16 to 32 |
420 |
depressurized (up to ≈ 2 bar) |
315 |
● |
|
|
DBD. 6 K1X/… 2) |
25 402 |
40 to 63 |
400 |
315 |
● |
||
|
DBD. 10 K1X/… 2) |
25 402 |
80, 100 |
400 |
315 |
● |
||
|
M-3SEW 6 … |
22 058 |
16 to 63 |
420 |
100 |
● |
||
|
M-3SED 6 … |
22 049 |
16 to 63 |
315 |
X-40 |
● |
||
|
M-3SEW 10 … |
22 075 |
80, 100 |
420 |
100 |
● |
||
|
M-3SED 10 … |
22 045 |
80, 100 |
315 |
X-40 |
● |
||
| 1) Possible pressure ratings: 25, 50, 100, 200, 315, 420 | |
| 2) Possible pressure ratings: 25, 50, 100, 200, 315, 400 |
Notice:
By combination of a 2-way cartridge valve with a pilot control valve, various valve functions can be realized.
In particular, the following devices come into question in porting pattern form A6 (up to NG 63) and form A10 (NG 80 to 100) DIN 24 340.
Valve mounting screws are included in the scope of delivery of the control cover.
|
Orifice symbol |
Symbol in ordering code |
|||
|
A** |
|
A** |
|
This orifice is designed as screw-type orifice. If an orifice is to be installed, the respective code letter with the orifice Ø in 1/10 mm has to be entered in the type designation. Example: A12 = Orifice with Ø1.2 mm in channel A. |
|
Ø1,2 |
|
|
This orifice is designed as bore. No specifications are made in the type designation. (Orifice Ø in mm) |
|
|
Z12 |
|
|
This orifice is designed as screw-type orifice. This is a standard orifice. No specifications are made in the type designation. (Orifice Ø in 1/10 mm) |
|
Additional preferred types and standard units are specified in the EPS (standard price list).
The control covers are equipped with standard orifice fitting – optimized in our test area. Orifice specification in the type key is not necessary. Deviating operating conditions may require respective adjustment of the orifice size. The orifices are designed as screw-type orifices.
Orifice representation in symbol
LFA..DBS.-7X/...NG 40, 50, 63
M-3SED 6 U../350…
M-3SEW 6 U../420…
M-3SED 6 C../350…
M-3SEW 6 C../420…
LFA..DBS.-6X/...NG 80, 100
M-3SED 10 U../350…
M-3SEW 10 U../420…
M-3SED 10 C../350…
M-3SEW 10 C../420…
Installation bore and connection dimensions according to ISO 7368
NG16 ... 63
Dimensions in mm
|
5 |
Bore for locating pin (cover pin assembled according to DIN 24 342) |
|
6 |
Information on porting pattern NG 16: Length L1 (axis x–y bores) is 80 mm |
|
8 |
Bore for locating pin at function as main pressure relief valve (reposition cover pin for assembly accordingly) |
NG 80, 100
Dimensions in mm
|
5 |
Bore for locating pin (cover pin assembled according to DIN 24 342) |
|
Mounting screws: Hexagon socket head cap screw according to DIN 912-10.9 |
||
|
Pilot control valve Type |
Dimensions |
Tightening torque in Nm |
|
M-3SEW 6 … |
M5 x 45 |
8,9 |
|
M-3SEW 10 … |
M6 x 40 |
15,5 |
|
M-3SED 6 … |
M5 x 50 |
8,9 |
|
M-3SED 10 … |
M6 x 40 |
15,5 |
|
Mounting screws (included in scope of delivery) |
|||
|
Hexagon socket head cap screw according to DIN 912-10.9 |
|||
|
NG |
Quantity |
Dimensions |
Tightening torque in Nm |
|
16 |
4 |
M 8 x 45 |
32 |
|
25 |
4 |
M 12 x 50 |
110 |
|
32 |
4 |
M 16 x 60 |
270 |
|
40 |
4 |
M 20 x 70 |
520 |
|
50 |
4 |
M 20 x 80 |
520 |
|
63 |
4 |
M 30 x 100 |
1800 |
|
80 |
8 |
M 24 x 120 |
900 |
|
100 |
8 |
M 30 x 120 |
1800 |
|
Thread dimensions of orifice |
|||
|
D orifices at type ..DBE.. NG 25 to 63 |
M8 x 1 conical |
||
|
Orifices for NG 80, 100 |
M8 x 1 conical (A**, B**, P**, D**) or G 1/4 (X**, F**) |
||
|
other installed orifices |
M6 conical |
||
NG 40, 50
Dimensions in mm
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
4 |
Adjustment type "2" |
|
5 |
Adjustment type "1" |
|
6 |
Adjustment type "3" |
|
7 |
Adjustment type "4" |
|
8 |
Space required to remove the key |
|
9 |
Name plate |
|
10 |
Lock nut |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
NG63
Dimensions in mm
NG63
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
4 |
Adjustment type "2" |
|
5 |
Adjustment type "1" |
|
6 |
Adjustment type "3" |
|
7 |
Adjustment type "4" |
|
8 |
Space required to remove the key |
|
9 |
Name plate |
|
10 |
Lock nut |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
NG 80, 100
Dimensions in mm
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
4 |
Adjustment type "2" |
|
5 |
Adjustment type "1" |
|
6 |
Adjustment type "3" |
|
7 |
Adjustment type "4" |
|
8 |
Space required to remove the key |
|
9 |
Name plate |
|
10 |
Lock nut |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
|
NG |
ØD1H7 |
ØD2 |
ØD3/(ØD3*) 1) |
ØD4H7 |
ØD5 2) |
ØD6 |
ØD7H13 |
H1 |
H2 |
H3 |
H4 |
H5 |
H6 |
H7 |
H8 |
H9 |
L1 |
L2 |
L3 |
L4 |
L5 |
W |
Ro 3) |
Ru 3) |
||
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
||
| 16 | 32 | 16 |
16 25 |
25 | M8 | 4 | 4 | 42.5 | 56 | + 0.1 | 43 | + 0.2 | 20 | 11 | 2 | 20 | 2 | 0.5 | 65 | 46 | 23 | 25 | 10.5 | 0.05 | 2 | 1 |
| 25 | 45 | 25 |
25 32 |
34 | M12 | 6 | 6 | 57 | 72 | + 0.1 | 58 | + 0.2 | 25 | 12 | 2.5 | 30 | 2.5 | 1 | 85 | 58 | 29 | 33 | 16 | 0.05 | 2 | 1 |
| 32 | 60 | 32 |
32 40 |
45 | M16 | 8 | 6 | 68.5 | 85 | + 0.1 | 70 | + 0.2 | 35 | 13 | 2.5 | 30 | 2.5 | 1.5 | 102 | 70 | 35 | 41 | 17 | 0.1 | 2 | 1 |
| 40 | 75 | 40 |
40 50 |
55 | M20 | 10 | 6 | 84.5 | 105 | + 0.1 | 87 | + 0.3 | 45 | 15 | 3 | 30 | 3 | 2.5 | 125 | 85 | 42.5 | 50 | 23 | 0.1 | 4 | 1 |
| 50 | 90 | 50 |
50 63 |
68 | M20 | 10 | 8 | 97.5 | 122 | + 0.1 | 100 | + 0.3 | 45 | 17 | 3 | 35 | 4 | 2.5 | 140 | 100 | 50 | 58 | 30 | 0.1 | 4 | 1 |
| 63 | 120 | 63 |
63 80 |
90 | M30 | 12 | 8 | 127 | 155 | + 0.1 | 130 | + 0.3 | 65 | 20 | 4 | 40 | 4 | 3 | 180 | 125 | 62.5 | 75 | 38 | 0.1 | 4 | 1 |
| 80 | 145 | 80 |
80 100 |
110 | M24 | 16 | 10 | 170.5 | 205 | + 0.1 | 175 | + 0.4 | 50 | 25 | 5 | 40 | 5 | 4.5 | 250 | 200 | - | - | - | 0.1 | 4 | 1 |
| 100 | 180 | 100 |
100 125 |
135 | M30 | 20 | 10 | 205.5 | 245 | + 0.1 | 210 | + 0.4 | 63 | 29 | 5 | 50 | 5 | 4.5 | 300 | 245 | - | - | - | 0.1 | 4 | 1 |
| 1) | Due to the use of a bore with ØD3*, port B protrudes over the upper limit of the area intended in ISO 7368. This is, however, possible due to the sealing concept and reduces the pressure loss during flow through the valve. Thus, we recommend a bore with ØD3*. |
| 2) | Mounting thread for version "/12" see data sheet 08936 |
| 3) | Maximum dimension |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
|
NG |
Ø Orifice A** 1) |
Ø Orifice P** 1) |
Ø Orifice F** 1) |
Ø Orifice D** 1) |
D1 |
H1 |
H2 |
H3 |
H4 |
H5 |
▢ L1 |
L3 |
L4 |
L5 |
L7 |
T1 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
||
| 40 | 0.8 | 1.2 | 1.2 | 1 | G1/4 | 60 | 17 | 32 | 27 | 40 | 125 | 69 | 76 | 68 | 47 | 12 |
| 50 | 0.8 | 1.5 | 1.5 | 2 | G1/2 | 68 | 19.5 | 34 | 35 | 50 | 140 | 80 | 84 | 74.5 | 54.5 | 14 |
| 1) | Orifice Ø, orifice M6 conical |
|
NG |
Ø Orifice P** 1) |
Ø Orifice F** 1) |
Ø Orifice D** 1) |
|
mm |
mm |
mm |
|
| 63 | 1.8 | 2 | 2 |
| 1) | Orifice Ø, orifice M6 conical |
|
NG |
Ø Orifice A** 1) |
Ø Orifice B** 1) |
Ø Orifice P** 1) |
Ø Orifice X** 2) |
Ø Orifice F** 2) |
D2 |
H1 |
H2 |
H3 |
H4 |
L8 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 80 | 1.2 | 3 | 3.5 | 3 | 2.5 | 250 | 100 | 30 | 45 | 52 | 75 |
| 100 | 1.5 | 3 | 3.5 | 3 | 2.5 | 300 | 100 | 30 | 51 | 52 | 85 |
| 1) | Orifice Ø, orifice M8 x 1 conical |
| 2) | Orifice Ø, orifice G 1/4 conical |
2/2, 3/2 and 4/2 directional seat valve with solenoid actuation
M-.SED6
2/2, 3/2 and 4/2 directional seat valve with solenoid actuation
M-.SED6
Size 6 Component series 1X Maximum operating pressure 350 bar Maximum flow 25 l/minData sheet
Operating Instructions
Configurator / CAD
Spare parts & repair
3/2 and 4/2 directional seat valve with solenoid actuation
M-.SED 10
3/2 and 4/2 directional seat valve with solenoid actuation
M-.SED 10
Size 10 Component series 1X Maximum operating pressure 350 bar Maximum flow 40 l/minData sheet
Operating Instructions
Configurator / CAD
Spare parts & repair
Directional poppet valves, directly operated, with solenoid actuation
M-.SEW 6
Directional poppet valves, directly operated, with solenoid actuation
M-.SEW 6
Size 6 Component series 3X Maximum operating pressure 420 / 630 bar Maximum flow 25 l/minData sheet
Operating Instructions
Configurator / CAD
Spare parts & repair
3/2 and 4/2 directional seat valve with solenoid actuation
M-.SEW 10
3/2 and 4/2 directional seat valve with solenoid actuation
M-.SEW 10
Size 10 Component series 1X Maximum operating pressure 420 / 630 bar Maximum flow 40 l/minData sheet
Operating Instructions
Configurator / CAD
Spare parts & repair
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