LOGIC COVER LFA25DB2-7X/420
Manufacturer: Bosch Rexroth
Material #: R900912764
Model : LFA25DB2-7X/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 LFA25DB2-7X/420 (R900912764) is a sophisticated control cover for way cartridge valves designed to reliably limit pressure in hydraulic systems. This manual adjustment component is essential for setting the maximum pressure in conjunction with a way cartridge valve as per the hydraulic symbol. The product features a hexagon pressure rating bar and a spool symbol of Symbol DB, indicating its function and design specifications.
With a maximum operating pressure of 420 bar, this control cover is suitable for subplate mounting and conforms to connection diagram standards set by ISO. Its compact size 25 and type of actuation through manual pressure adjustment make it versatile for various applications. The LFA25DB2-7X/420 weighs in at a manageable weight, ensuring ease of installation without compromising on durability or performance.
Equipped with NBR seals, the control cover can handle an array of hydraulic fluids including HL, HLP, HLPD, HVLP, HVLPD, and HFC. This compatibility ensures that it can be integrated into diverse hydraulic systems without concern for fluid-induced degradation. The product's construction allows it to work cohesively with pilot-operated valves in seat or spool designs that are installed into standardized receiving holes according to DIN ISO norms.
This Bosch Rexroth model is adept at performing both pressure relief and reducing functions due to its innovative design. In the pressure relief function, it operates as a seat valve with no effective area at port B. The set pressure triggers the spool to open when necessary to maintain desired operational parameters. Similarly, for the pressure reducing function, the spool remains open under specific conditions until the set pressure is reached, at which point it closes to reduce the pressure at port A as per requirements.
Overall, the Bosch Rexroth LFA25DB2-7X/420 provides reliable performance in regulating hydraulic pressures within industrial systems while offering flexibility and ease of use through manual adjustments.
$859.00 USD
More are expected on February 17, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as February 17, 2025 when ordered in
This product is eligible for factory repair.
Size 25, manual adjustment of maximum pressure
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: 2.14 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 |
manual pressure adjustment |
||
|
16 to 32 |
40 to 63 |
80 and 100 |
||
|
• |
• |
• |
Without directional valve |
|
|
• = available |
||||
|
01 |
02 |
03 |
04 |
05 |
06 |
07 |
||
|
LFA |
DB |
‒ |
/ |
|
Type |
||
|
01 |
Control cover LFA |
LFA |
|
Size |
||
|
02 |
NG 16 |
16 |
|
NG 25 |
25 |
|
|
NG 32 |
32 |
|
|
NG 40 |
40 |
|
|
NG 50 |
50 |
|
|
NG 63 |
63 |
|
|
NG 80 |
80 |
|
|
NG 100 |
100 |
|
|
Version |
||
|
03 |
With manual pressure adjustment |
DB |
|
Adjustment type for pressure adjustment |
||
|
04 |
Rotary knob |
1 |
|
Sleeve with internal hexagon |
2 |
|
|
Lockable rotary knob with scale (H-locking according to automotive standard) |
3 |
|
|
Rotary knob with scale |
4 |
|
|
Component series |
||
|
05 |
Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 1) |
7X |
|
Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) 2) |
6X |
|
|
Pressure rating |
||
|
06 |
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 |
|
|
Set pressure up to 400 bar |
400 |
|
|
Set pressure up to 420 bar 3) |
420 |
|
|
Seal material |
||
|
07 |
NBR seals |
no code |
|
FKM seals |
V |
|
| 1) Component series 7X for sizes 16…63. | |
| 2) Component series 6X for sizes 80 and 100. | |
| 3) 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 |
● |
||
| 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).
(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.
manual pressure adjustment
Type LC 16 DB.E… (with seat piston)
manual pressure adjustment
Type LC 16 DB.E… (with seat piston)
manual pressure adjustment
Type LC 16 DB.D… (seat-spool valve)
manual 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.
manual pressure adjustment
Type LC 25 DB.E… (with seat piston)
manual pressure adjustment
Type LC 25 DB.E… (with seat piston)
manual pressure adjustment
Type LC 25 DB.D… (with seat-spool piston)
manual 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.
manual pressure adjustment
Type LC 32 DB.E… (with seat piston)
manual pressure adjustment
Type LC 32 DB.E… (with seat piston)
manual pressure adjustment
Type LC 32 DB.D… (with seat-spool piston)
manual 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.
manual pressure adjustment
Type LC 40 DB.E… (with seat piston)
manual pressure adjustment
Type LC 40 DB.E… (with seat piston)
manual pressure adjustment
Type LC 40 DB.D… (with seat-spool piston)
manual 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.
manual pressure adjustment
Type LC 50 DB.E… (with seat piston)
manual pressure adjustment
Type LC 50 DB.E… (with seat piston)
manual pressure adjustment
Type LC 50 DB.D… (with seat-spool piston)
manual 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.
manual pressure adjustment
Type LC 63 DB.E… (with seat piston)
manual pressure adjustment
Type LC 63 DB.E… (with seat piston)
manual pressure adjustment
Type LC 63 DB.D… (with seat-spool piston)
manual pressure adjustment
Type LC 63 DB.D… (with seat-spool piston)
LFA..DB.-7X/..NG 16, 25, 32
LFA..DB.-7X/..NG 40, 50, 63
LFA...DB.-6X/...NG 80, 100
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
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 (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 |
|
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 |
|
1 |
Port X 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 |
|
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 |
|
1 |
Port X 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 |
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 |
|
1 |
Port X 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 |
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 |
|
1 |
Port X 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 |
|
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 80 |
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 |
86 | 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 |
| 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 X** 1) |
Ø Orifice F** 1) |
Ø Orifice D** |
H1 |
H2 |
H3 |
H4 |
L1 |
L2 |
L3 |
L4 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 16 | 0.8 | 1 | - | 40 | 17 | 15 | 19 | 65 | 80 | 36.5 | 32.5 |
| 25 | 0.8 | 1 | - | 40 | 19 | 24 | 19 | 85 | 85 | 49 | 45.5 |
| 32 | - | 1.2 | 0.8 1) | 50 | 26 | 28 | 26 | 100 | 100 | 56.5 | 53 |
| 1) | Orifice Ø, orifice M6 conical |
Dimensions in mm
|
NG |
Ø Orifice F** 1) |
Ø Orifice D** 1) |
D1 |
H1 |
H2 |
H3 |
H4 |
▢ L1 |
L2 |
L3 |
L4 |
L5 |
T1 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
||
| 40 | 1.2 | 1 | G1/4 |
60 - |
28 - |
32 | 27 | 125 | 69 | 89 | 76 | 60 | 12 |
| 50 | 1.5 | 2 | G1/2 |
68 - |
19.5 - |
34 | 35 | 140 | 80 | 105 | 84 | 70 | 14 |
| 63 | 2 | 2.5 | - |
82 - |
30 - |
50 | 45.5 | 180 | - | - | - | - | - |
| 1) | Orifice Ø, orifice M6 conical |
|
NG |
Ø Orifice X** 1) |
Ø Orifice F** 1) |
D2 |
H1 |
H2 |
H3 |
H4 |
L8 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 80 | 3 | 2.5 | 250 | 100 | 38 | 45 | 58 | 50 |
| 100 | 3 | 2.5 | 300 | 100 | 38 | 51 | 58 | 50 |
| 1) | Orifice Ø, orifice G 1/4 conical |
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