LOGIC COVER LFA25DBEM-7X/420
Manufacturer: Bosch Rexroth
Material #: R900925873
Model : LFA25DBEM-7X/420
***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 LFA25DBEM-7X/420 (R900925873) is a sophisticated hydraulic control valve designed for precise pressure regulation in hydraulic systems. This model features a manual maximum pressure adjustment complemented by an electrically proportional pressure adjustment, offering users a high level of control over system pressure. It is equipped with an ISO standard mounting surface, making it suitable for integration with way cartridge valves. The hexagon-shaped valve has a maximum pressure rating of 420 bar and is identified under the product group ID.
The LFA25DBEM-7X/420 valve is engineered to provide reliable pressure limiting when used in conjunction with a way cartridge valve, as indicated by its spool symbol DBEM. The size 25 valve allows for subplate mounting and follows the connection diagram specified by ISO standards. Weighing in at .kg, it comes with NBR seals and is compatible with various hydraulic fluids including HL, HLP, HLPD, HVLP, HVLPD, and HFC.
This model's way cartridge valves are pilot-operated and can be either seat or spool design. The power section of the valve is designed to fit into a standardized receiving hole according to DIN ISO standards and secured with a control cover. The integrated pilot control valve allows for manual or electrically proportional adjustments.
In terms of functionality, the LFA25DBEM-7X/420 offers both pressure relief and reducing functions without area difference at port B. Its design ensures that upon reaching the set pressure limit, the spool opens or closes to adjust the flow accordingly—maintaining system stability and performance.
The versatility of this component series X allows it to cater to different applications by enabling various combinations of cartridge valves and control covers to achieve desired pressure functions within an operating pressure range up to 420 bar.
$994.00 USD
More are expected on October 10, 2024
Status: This product is temporarily out of stock.
Qty: Delivered as early as October 10, 2024 when ordered in
This product is eligible for factory repair.
Size 25, manual maximum pressure adjustment with electrically proportional pressure adjustment, with mounting surface ISO4401
Control cover for 2-way cartridge valves, reliable limiting of the pressure in connection with a 2-way cartridge valve according to the hydraulic symbol.
Unpacked Weight: 2.100 kg
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 |
Proportional pressure adjustment version |
|||
|
16 to 32 |
40 to 63 |
80 and 100 |
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• |
• |
• |
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• = available |
|||||
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Proportional valves |
• |
• |
DBET-5X/... |
with maximum pressure limitation |
|
|
01 |
02 |
03 |
04 |
05 |
06 |
||
|
LFA |
DBEM |
‒ |
7X |
/ |
|
Type |
||
|
01 |
Control cover LFA |
LFA |
|
Size |
||
|
02 |
NG 16 |
16 |
|
NG 25 |
25 |
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|
NG 32 |
63 |
|
|
NG 40 |
40 |
|
|
NG 50 |
50 |
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|
NG 63 |
63 |
|
|
NG 80 |
80 |
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|
NG 100 |
100 |
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|
Version |
||
|
03 |
With electrical proportional pressure adjustment, with maximum pressure limitation without electrical feedback and with maximum pressure limitation |
DBEM 1) |
|
Component series |
||
|
04 |
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 DBmax. (observe admissible pressure of the pilot control valve) |
||
|
05 |
Set pressure up to 25 bar |
025 |
|
Set pressure up to 50 bar |
050 |
|
|
Set pressure up to 100 bar |
100 |
|
|
Set pressure up to 200 bar |
200 |
|
|
Set pressure up to 315 bar |
315 |
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|
Set pressure up to 400 bar |
400 |
|
|
Set pressure up to 420 bar 4) |
420 |
|
|
Seal material |
||
|
08 |
NBR seals |
no code |
|
FKM seals |
V |
|
| 1) For set-up of a proportional pressure relief valve without electrical feedback and with maximum pressure limitation | |
| 2) Component series 7X for sizes 16…63. | |
| 3) Component series 6X for sizes 80 and 100. | |
| 4) NG 16 ... 32 only |
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 |
● |
||
|
DBET-5X/.G24-1 3) |
29 165 |
16 to 32 |
350 |
100 |
● |
||
|
DBET-5X/.G24… |
29 165 |
40 |
350 |
100 |
● |
||
|
DBET-5X/.YG24-1 3) |
upon request |
50 to 100 |
350 |
100 |
● |
||
| 1) Possible pressure ratings: 25, 50, 100, 200, 315, 420 | |
| 2) Possible pressure ratings: 25, 50, 100, 200, 315, 400 | |
| 3) Possible pressure ratings: 50, 100, 200, 315, 350 1 = G 1/4 threaded port T; special cone |
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..DBEM-7X/...NG 16, 25, 32
LFA..DBEM-7X/...NG 40
LFA..DBEM-7X/...NG 50, 63
LFA..DBEM-6X/...NG 80, 100
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 |
|
DBET … |
M5 x 30 |
8,9 |
|
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 16, 25, 32
Dimensions in mm
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
4 |
Adjustment type "2" |
|
9 |
Name plate |
|
10 |
Lock nut |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
|
14 |
Proportional pressure relief valve type DBET-5X/…G24 (NG 40) type DBET-5X/…Y G24-1 (NG 50) 1) |
|
15 |
Pressure relief valve NG 6 (included in scope of delivery) |
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
4 |
Adjustment type "2" |
|
9 |
Name plate |
|
10 |
Lock nut |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
|
14 |
Proportional pressure relief valve type DBET-5X/…–1 1) |
| 1) 1 = G 1/4 threaded port T; special cone | |
| 1) 1 = G 1/4 threaded port T; special cone |
Dimensions in mm
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
4 |
Adjustment type "2" |
|
9 |
Name plate |
|
10 |
Lock nut |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
|
14 |
Proportional pressure relief valve type DBET-5X/…G24 (NG 40) type DBET-5X/…Y G24-1 (NG 50) 1) |
|
15 |
Pressure relief valve NG 6 (included in scope of delivery) |
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
4 |
Adjustment type "2" |
|
9 |
Name plate |
|
10 |
Lock nut |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
|
14 |
Proportional pressure relief valve type DBET-5X/…–1 1) |
| 1) 1 = G 1/4 threaded port T; special cone |
NG63
Dimensions in mm
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
4 |
Adjustment type "2" |
|
9 |
Name plate |
|
10 |
Lock nut |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
|
14 |
Proportional pressure relief valve type DBET-5X/…Y G24 1) |
|
15 |
Pressure relief valve NG 6 (included in scope of delivery) |
| 1) 1 = G 1/4 threaded port T; special cone |
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" |
|
9 |
Name plate |
|
14 |
Proportional pressure relief valve type DBET-5X/…Y G24 1) |
|
15 |
Pressure relief valve NG 6 (included in scope of delivery) |
| 1) 1 = G 1/4 threaded port T; special cone |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
|
NG |
Ø Orifice P** 1) |
Ø Orifice X** 1) |
Ø Orifice F** 1) |
Ø Orifice D** 1) |
H1 |
H2 |
H3 |
H4 |
H5 |
L1 |
L2 |
L3 |
L4 |
L5 |
L7 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 16 | 1 | 0.8 | 1 | 0.8 | 40 | 17 | 15 | 19 | 28 | 65 | 80 | 36.5 | 32.5 | 7 | 35 |
| 25 | 1 | 0.8 | 1 | 0.8 | 40 | 19 | 24 | 19 | 28 | 85 | 85 | 49 | 45.5 | 8 | 36 |
| 32 | 1 | 1 | 1.2 | 1 | 50 | 26 | 28 | 26 | 37 | 100 | 100 | 56.5 | 53 | 31 | 57 |
| 1) | Orifice Ø, orifice M6 conical |
|
NG |
Ø Orifice B** |
Ø Orifice P** 1) |
Ø Orifice F** 1) |
Ø Orifice D** 1) |
H1 |
H2 |
H3 |
H4 |
H5 |
▢ L1 |
L3 |
L4 |
L5 |
L7 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 40 | - | 1.5 | 1.2 | 1 | 60 | 20 | 32 | 27 | 40 | 125 | 69 | 76 | 43.5 | 68 |
| 50 | 0.8 1) | - | 1.5 | 2 | 68 | 19.5 | 34 | 35 | 50 | 140 | 80 | 84 | 51 | 74.5 |
| 1) | Orifice Ø, orifice M6 conical |
|
NG |
Ø Orifice B** |
Ø Orifice P** |
Ø Orifice X** |
Ø Orifice F** |
Ø Orifice D** 1) |
D2 |
H1 |
H2 |
H3 |
H4 |
▢ L1 |
L8 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 63 | 0.8 1) | - | - | 2 1) | 2.5 | - | 82 | 55 | 50 | 45 | 180 | - |
| 80 | 0.8 2) | 1 2) | 3 3) | 2.5 3) | - | 250 | 100 | 30 | 45 | 52 | - | 75 |
| 100 | 0.8 2) | 1 2) | 3.5 3) | 3 3) | - | 300 | 100 | 30 | 51 | 52 | - | 85 |
| 1) | Orifice Ø, orifice M6 conical |
| 2) | Orifice Ø, orifice M8 x 1 conical |
| 3) | Orifice Ø, orifice G 1/4 conical |
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