LOGIC COVER LFA25DR2-7X/210
Manufacturer: Bosch Rexroth
Material #: R900931453
Model : LFA25DR2-7X/210
***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 LFA25DR2-7X/210 (R900931453) is a sophisticated control cover designed for way cartridge valves, offering reliable manual pressure reduction capabilities. This component is engineered to work seamlessly with way cartridge valves, facilitating the precise reduction of pressure in hydraulic systems. The model features a spool symbol DR and is capable of handling a maximum pressure as specified by the product group identification.
With its subplate mounting type of connection, the LFA25DR2-7X/210 adheres to the connection diagram standards set by ISO. It is constructed to be durable and robust, with NBR seals that ensure compatibility with various hydraulic fluids including HL, HLP, HLPD, HVLP, HVLPD, and HFC types.
The valve cover operates as part of a system that includes power sections designed as cartridge valves and installed according to DIN ISO standards. The manual actuation for pressure reduction is facilitated through an integrated pilot control valve or one mounted on the control cover in accordance with DIN specifications.
This model allows for a variety of pressure functions through different combinations of cartridge valves and control covers. Specifically tailored for pressure reducing functions with a rest position that's closed, it enables smooth flow from port A to port B once the main spool opens up until the desired set pressure is reached.
Moreover, any potential secondary side pressure increases are effectively managed by discharging them back to the tank via the third way of the pilot control valve. Users can also realize an additional blocking function by setting up a directional valve using type LFA..DRW.... The Bosch Rexroth LFA25DR2-7X/210 represents an essential component for those seeking precise manual pressure adjustments in their hydraulic systems.
$1,420.00 USD
Availability: 1 In Stock
Available for immediate shipmentQty: Delivered as early as January 28, 2025 when ordered in
This product is eligible for factory repair.
Size 25, manual pressure reduction
Control cover for 2-way cartridge valves Reliable reduction of the pressure in connection with a 2-way cartridge valve according to the hydraulic symbol.
Unpacked Weight: 3.580 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 reducing function
Rest position closed
For the pressure reducing function with opening characteristic, a pressure limitation cartridge valve (type LC..DB40D...) and a control cover with a pressure reducing pilot control valve (type LFA..DR...) are applied. The pilot oil is directed from port A via the supply orifice and the opened pilot control valve to side B.
The main spool is opened and the flow from port A to port B is released.
On reaching the set pressure, the spool is closed and the pressure at port B is reduced according to the pressure-flow characteristics. Potential pressure increases on the secondary side are discharged to the tank via the 3rd way of the pilot control valve. Set-up of a directional valve enables realization of an additional blocking function (type LFA..DRW...).
Control cover for pressure reducing function
|
01 |
02 |
03 |
04 |
05 |
06 |
07 |
||
|
LFA |
DR |
‒ |
7X |
/ |
|
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 |
Pressure reducing function - Main spool in rest position closed (LC..DB 40 D..- separate order) |
DR |
|
Adjustment type for pressure adjustment |
||
|
04 |
Rotary knob |
1 |
|
Sleeve with hexagon and protective cap |
2 |
|
|
Lockable rotary knob with scale, incl. H-key |
3 |
|
|
Rotary knob with scale |
4 |
|
|
Component series |
||
|
05 |
Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) |
7X |
|
Pressure rating DBmax. (observe admissible pressure of the pilot control valve) |
||
|
06 |
Set pressure up to 25 bar |
025 |
|
Set pressure up to 75 bar |
075 |
|
|
Set pressure up to 150 bar |
150 |
|
|
Set pressure up to 210 bar |
210 |
|
|
Set pressure up to 315 bar |
315 |
|
|
Seal material |
||
|
07 |
NBR seals |
no code |
|
FKM seals |
V |
|
Additional preferred types and standard units are specified in the EPS (standard price list).
Main spool in rest position closed - LC..DB 40 D..- separate order
|
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) |
|
LFA..DR.-7X/...NG 16
LFA..DR.-7X/...NG 25, 32
LFA..DR.-7X/...NG 40, 50
LFA..DR.-7X/...NG 63
Attention!
Control covers type LFA..DR... are combined with 2-way cartridge valves type LC..DB 40 D... (see ordering code).
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
(basic symbol) - Pressure reducing function
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 16, 25, 32
Dimensions in mm
|
1 |
Port X optionally as threaded port (at NG 16...50) |
|
3.1 |
Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63) |
|
4 |
Locating pin |
|
9.1 |
Name plate (NG16) |
|
9.2 |
Name plate (NG 25, 32) |
NG 40, 50
Dimensions in mm
|
1 |
Port X optionally as threaded port (at NG 16...50) |
|
2 |
Port Y optionally as threaded port (at NG 40, 50) |
|
3.1 |
Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63) |
|
3.2 |
Port Z2 optionally as threaded port (at NG 40, 50, 63) |
|
4 |
Locating pin |
|
9.3 |
Name plate (NG 40, 50, 63) |
|
10 |
Check valve (at NG 63 orifice F in poppet) |
NG63
Dimensions in mm
|
3.1 |
Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63) |
|
3.2 |
Port Z2 optionally as threaded port (at NG 40, 50, 63) |
|
4 |
Locating pin |
|
9.3 |
Name plate (NG 40, 50, 63) |
|
10 |
Check valve (at NG 63 orifice F in poppet) |
|
11 |
At control cover NG 63, logic element NG 16 |
NG16 ... 63
Dimensions in mm
|
5.1 |
Adjustment element "4" |
|
5.2 |
Adjustment element "3" |
|
6 |
Adjustment element "2" |
|
7 |
Adjustment element "1" |
|
8 |
direct operated pressure reducing valve (included in the scope of delivery) |
|
9 |
Name plate of the pressure reducing valve |
|
11 |
Valve mounting screws M5x50 DIN 912-10.9 MA = 8.9 Nm are included in the scope of delivery of the control cover |
|
12 |
Pressure gauge connection G1/4; 12 mm deep; internal hexagon SW6 |
|
13 |
Space required to remove the key |
|
14 |
Control cover |
|
15 |
Lock nut SW24 |
|
16 |
at type .../315 → 50 mm |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
|
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 |
|
NG |
H1 |
H2 |
H3 |
L1 |
L2 |
L3 |
L7 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 16 |
40 - |
17 - |
15 |
65 - |
80 | 36.5 | 49 |
| 25 |
40 - |
19 - |
24 |
85 - |
85 | 49 | 59 |
| 32 |
50 - |
26 - |
28 |
100 - |
100 | 56.5 | 66.5 |
Valve dimensions
|
NG |
Ø Orifice A** |
Ø Orifice X** 1) |
Ø Orifice F** |
Ø Orifice D** |
L8 |
L9 |
L10 |
L11 |
L12 |
||||||
|
.../315 |
.../315 |
.../315 |
.../315 |
.../315 |
.../315 |
||||||||||
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 16 | - | 2.5 | - | 0.8 1) | 0.8 1) | 22 | 30.5 | 119.5 | 116.5 | 143.5 | 140.5 | 99.5 | 96.5 | 99.5 | 96.5 |
| 25 | - | - | 0.8 1) | 3 2) | 1.8 2) | 5.5 | 14 | 131 | 128 | 155 | 152 | 111 | 108 | 111 | 108 |
| 32 | - | - | 1 1) | 3 2) | 1.8 2) | - | 6 | 123.5 | 120.5 | 148.5 | 145.5 | 103.5 | 100.5 | 103.5 | 100.5 |
| 40 | - | - | 1.2 1) | 3 2) | 1.8 2) | - | - | 111 | 108 | 135 | 132 | 91 | 88 | 91 | 88 |
| 50 | - | - | 1.5 1) | 3 2) | 1.8 2) | - | - | 103.5 | 100.5 | 128.5 | 125.5 | 83.5 | 80.5 | 83.5 | 80.5 |
| 63 | 2 1) | - | 1.5 1) | 3 1) | 1.8 1) | - | - | 87.5 | 84.5 | 111.5 | 108.5 | 67.5 | 64.5 | 67.5 | 64.5 |
| 1) | Orifice Ø, orifice M6 conical |
| 2) | Orifice Ø, orifice M8 x 1 conical |
|
NG |
H1 |
H2 |
H3 |
H4 |
H5 |
L1 |
L2 |
L3 |
L4 |
L5 |
L7 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 40 |
60 - |
30 - |
32 | 40 | 40 |
125 - |
125 | 72 | 62.5 | 62.5 | 79 |
| 50 |
68 - |
32 - |
34 | 32 | 32 |
140 - |
140 | 80 | 70 | 70 | 86.5 |
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