LOGIC COVER LFA25DBE-7X/
Manufacturer: Bosch Rexroth
Material #: R900912772
Model : LFA25DBE-7X/
***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 LFA25DBE-7X (R900912772) is a sophisticated control cover designed for use with way cartridge valves, providing a reliable solution for electrically proportional pressure adjustment. This model, which lacks an included cartridge, is intended to be paired with a way cartridge valve according to the hydraulic symbol to effectively limit pressure within hydraulic systems. The unit is notable for its compliance with ISO standards regarding mounting surfaces, ensuring compatibility and ease of integration into existing systems.
The LFA25DBE-7X is engineered to function seamlessly with pilot-operated valves in both seat and spool designs. The power section of the valve is installed into a standardized receiving hole as per DIN ISO norms and secured with this control cover. It features an integrated pilot control valve for manual or electrically proportional pressure adjustments, which can be mounted directly onto the control cover following DIN specifications.
This model facilitates various pressure functions by combining it with corresponding cartridge valves. For instance, in its pressure relief function, the associated seat valve operates without an area difference at port B; the effective pressure at port A is regulated through the pilot oil supply orifice to the spring side of the element. When the set pressure is reached, the spool opens, limiting the pressure at port A as per the characteristics of pressure flow.
In terms of its pressure reducing function, when paired with an appropriate spool valve design, it maintains an open rest position allowing free flow from port B to port A until a set pressure threshold prompts closure and consequent reduction of pressure at port A.
The Bosch Rexroth LFA25DBE-7X boasts compatibility with various sizes of pilot control valves and offers proportional pressure adjustment capabilities. It can operate up to a maximum operating pressure indicated by its component series X designation. The unit's construction includes NBR seals suitable for hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, and HFC types. Its subplate mounting type ensures secure installation while maintaining a streamlined profile within hydraulic systems.
$843.00 USD
More are expected on April 14, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as April 14, 2025 when ordered in
This product is eligible for factory repair.
Size 25, 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: 2.000 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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|
• |
• |
• |
|||
|
• = available |
|||||
|
Proportional valves |
• |
• |
DBET-5X/... |
without maximum pressure limitation |
|
|
01 |
02 |
03 |
04 |
05 |
||
|
LFA |
DBE |
‒ |
/ |
|
Type |
||
|
01 |
Control cover LFA |
LFA |
|
Size |
||
|
02 |
NG 16 |
16 |
|
NG 25 |
25 |
|
|
NG 32 |
63 |
|
|
NG 40 |
40 |
|
|
NG 50 |
50 |
|
|
NG 63 |
63 |
|
|
Version |
||
|
03 |
For set-up of a proportional pressure relief valve without electrical feedback |
DBE |
|
Component series |
||
|
04 |
Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) |
7X |
|
Seal material |
||
|
05 |
NBR seals |
no code |
|
FKM seals |
V |
|
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 |
|||||
|
DBET‑5X/.G24‑1 3) |
29 165 |
16 to 32 |
350 |
depressurized (up to ≈ 2 bar) |
100 |
● |
|
|
DBET‑5X/.G24… |
29 165 |
40 |
350 |
100 |
● |
||
|
DBET‑5X/.YG24‑1 3) |
upon request |
50 to 100 |
350 |
100 |
● |
||
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).
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
electrically proportional pressure adjustment
Type LC 16 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 16 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 16 DB.D… (seat-spool valve)
electrically proportional pressure adjustment
Type LC 16 DB.D… (seat-spool valve)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
electrically proportional pressure adjustment
Type LC 25 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 25 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 25 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 25 DB.D… (with seat-spool piston)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
electrically proportional pressure adjustment
Type LC 32 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 32 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 32 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 32 DB.D… (with seat-spool piston)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
electrically proportional pressure adjustment
Type LC 40 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 40 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 40 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 40 DB.D… (with seat-spool piston)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
electrically proportional pressure adjustment
Type LC 50 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 50 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 50 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 50 DB.D… (with seat-spool piston)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
electrically proportional pressure adjustment
Type LC 63 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 63 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 63 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 63 DB.D… (with seat-spool piston)
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...DBE-7X/ NG 16
LFA...DBE-7X/ NG 25, 32, 40
LFA...DBE-7X/ NG 50, 63
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) |
|
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 |
||
Dimensions in mm
|
1 |
Port X optionally as threaded port |
|
2 |
Port Y optionally as threaded port |
|
3 |
Locating pin |
|
9 |
Name plate |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
|
14 |
Proportional pressure relief valve type DBET-5X/... |
|
15 |
Pressure relief valve NG 6 (included in scope of delivery) |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
|
NG |
16 | 25 | 32 | 40 | 50 | 63 | |
|
ØD5 1) |
M8 | M12 | M16 | M20 | M20 | M30 | |
|
ØD6 |
mm |
4 | 6 | 8 | 10 | 10 | 12 |
|
ØD7H13 |
mm |
4 | 6 | 6 | 6 | 8 | 8 |
|
H4 |
mm |
20 | 25 | 35 | 45 | 45 | 65 |
|
L1 |
mm |
65 80 |
85 - |
102 - |
125 - |
140 - |
180 - |
|
L2 |
mm |
46 - |
58 - |
70 - |
85 - |
100 - |
125 - |
|
L3 |
mm |
23 | 29 | 35 | 42.5 | 50 | 62.5 |
|
L4 |
mm |
25 | 33 | 41 | 50 | 58 | 75 |
|
L5 |
mm |
10.5 | 16 | 17 | 23 | 30 | 38 |
| 1) | Mounting thread for version "/12" see data sheet 08936 |
|
1 |
Bore for locating pin |
|
2 |
80 mm only at control cover for directional valve set-up NG16 (axis X–Y bore) |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
|
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 |
|
NG |
Ø Orifice B** |
Ø Orifice P** 1) |
Ø Orifice X** 1) |
Ø Orifice F** |
Ø Orifice D** |
D1 |
H1 |
H2 |
H3 |
H4 |
L1 |
L2 |
L3 |
L4 |
L5 |
T1 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
||
| 16 | - | 1 | 0.8 | - | 0.8 1) | G1/4 | 40 | 17 | 15 | 20 | 65 | 80 | 36.5 | 23.5 | 7 | 12 |
| 25 | - | 1 | - | 0.8 1) | 0.8 2) | G1/4 | 40 | 19 | 24 | 19 | 85 | 85 | 49 | 36 | 23.5 | 12 |
| 32 | - | 1 | - | 1 1) | 0.8 2) | G1/4 | 50 | 26 | 28 | 26 | 100 | 100 | 56.5 | 43.5 | 31 | 12 |
| 40 | - | 1.5 | - | 1.2 1) | 1 2) | G1/2 | 60 | 30 | 32 | 30 | 125 | 125 | 72 | 53 | 43.5 | 14 |
| 50 | 0.8 1) | - | - | 1.5 1) | 2 2) | G1/2 | 68 | 32 | 34 | 32 | 140 | 140 | 80 | 50 | 51 | 14 |
| 63 | 0.8 1) | - | - | 2 1) | 2.5 2) | G1/2 | 82 | 30 | 50 | 40 | 180 | 180 | 100 | 80 | 71 | 14 |
| 1) | Orifice Ø, orifice M6 conical |
| 2) | Orifice Ø, orifice M8 x 1 conical |
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