***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 LFA50WEA-7X/T18 (R900958312) is a sophisticated way cartridge valve designed for seamless integration into compact block systems. This valve is specifically engineered to support pressure, directional, and throttle functions or their combinations within hydraulic systems. The LFA50WEA-7X/T18 boasts a standardized receiving hole for the power section according to ISO norms, ensuring compatibility and ease of installation.
This model includes a control cover that houses control bores and may include additional features such as stroke limitation, hydraulically controlled directional seat valves, or shuttle valves depending on the desired overall function. The possibility to add electrically operated directional spool or seat valves further enhances its versatility. Accompanying the control cover is an installation kit comprising essential components like a bushing, ring (up to NG), valve poppet with an option for damping nose, and a closing spring.
The operation of the LFA50WEA-7X/T18 is pressure-dependent, creating three distinct pressurized areas (A1, A2, A3) that are crucial for its function. The unique area ratios A1:A2 - either 0.7:1 or 1:1 - along with varying annulus areas A2 contribute to its adaptability in different hydraulic scenarios. The cartridge valve's opening force is influenced by areas A1 and A2 while closing force by area A3 and the spring mechanism.
Furthermore, this model can facilitate flow from port A to B or vice versa with options for different springs and cracking pressures tailored to specific applications. It operates at a maximum pressure of up to 350 bar and can handle maximum flows up to 1500 l/min depending on the series size which includes component series X6, X8, and X10.
In summary, the Bosch Rexroth LFA50WEA-7X/T18 offers high flexibility for hydraulic system designers looking for a reliable way cartridge valve that can be customized for various functions while maintaining cost-effectiveness through its multi-functional capabilities.
$725.00 USD
More are expected on May 8, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as May 8, 2025 when ordered in
This product is eligible for factory repair.
2 area ratios 4 different springs 6 different cracking pressures
2-way cartridge valves are elements that have been designed for a compact block design. The power section with connections A and B is installed into the control block in a receiving hole standardized according to ISO 7368 and closed with a cover. In most cases, the cover is also the connection from the control side of the power section to the pilot control valves.
By control with respective pilot control valves, the power section can be applied for pressure, directional and throttle functions or a combination of these functions. Particularly efficient solutions are realized by adjustment of the size to various flows of the individual ways of an actuator. The application of power sections of elements for multiple functions is very cost-effective.
2-way cartridge valves generally consist of control cover (1) and installation kit (2). The control cover contains the control bores and optionally a stroke limitation function, a hydraulically controlled directional seat valve or a shuttle valve according to the required overall function. Additionally, electrically operated directional spool or seat valves can be installed at a control cover. The installation kit consists of a bushing (3), ring (4) (only up to NG32), valve poppet (5), optionally with damping nose (6) or without damping nose (7) as well as closing spring (8).
The function of 2-way cartridge valves is pressure-dependent. This way, three crucial pressurized areas A1, A2, A3 are realized for the function. The area at valve seat A1 is observed as 100 %. Depending on the version, the annulus area A2 realized by grading is 7 % or 50 % of area A1. The area ratio A1 : A2 is respectively either 14.3 : 1 or 2 : 1. The area A3 is identical to the sum of areas A1 + A2. Due to the different area ratios A1 : A2 and the resulting different annulus areas (A2), the area A3 is one time 107 % and another time 150 % of the area A1 at the seat, which is observed as 100 %.
In general, the following applies:
The areas A1 and A2 are effective in opening direction. The area A3 and the spring are effective in closing direction. The direction of action of the resulting force from the opening and closing forces determines the spool position of the 2-way cartridge valve.
The 2-way cartridge valves can be passed from A to B or from B to A. Pressurization of area A3 by pilot oil discharge from channel B or external pilot oil supply, channel A is blocked without leakage.
01 |
02 |
03 |
04 |
05 |
06 |
07 |
||
LFA |
WEA |
– |
/ |
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 |
|
NG 125 |
125 |
|
NG 160 |
160 |
|
Version |
||
03 |
Control cover version "WEA": For set-up of a directional valve |
WEA |
Component series |
||
04 |
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 |
|
Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions) 3) |
2X |
|
Nozzle fitting |
||
05 |
Orifice in channel A 4) |
A.. |
06 |
Orifice in channel P 4) |
P.. |
07 |
Orifice in channel T 4) |
T.. |
1) Component series 7X for sizes 16...63 | |
2) Component series 6X for sizes 80 and 100 | |
3) Component series 2X for sizes 125 and 160 | |
4) 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. Additional orifice Ø see diagrams/characteristic curves. |
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) |
Notices:
For ordering code of orifices, see "Accessories" Additional functions with special numbers see "Information".
general
Size |
16 | 25 | 32 | 40 | 50 | 63 | 80 | 100 | 125 | 160 | ||
Weight |
kg |
1.2 | 2.3 | 4 | 7.4 | 10.5 | 21 | 27 | 42 | 80 | 150 | |
Ambient temperature range |
NBR seals |
°C |
-30 … +60 | |||||||||
FKM seals |
°C |
-20 … +60 | ||||||||||
MTTFD values according to EN ISO 13849 1) |
Years |
150 |
1) | For further details, see data sheet 08012 |
hydraulic
Size |
16 | 25 | 32 | 40 | 50 | 63 | 80 | 100 | 125 | 160 | ||
Maximum operating pressure |
Port X 1) |
bar |
315 350 420 |
|||||||||
Port Z2 |
bar |
- - - |
315 1) 350 1) 420 1) |
|||||||||
Port Y |
depending on the maximum tank pressure of the attached directional valve | |||||||||||
Maximum flow 2) |
l/min |
25000 | ||||||||||
Hydraulic fluid |
see table | |||||||||||
Hydraulic fluid temperature range |
NBR seals |
°C |
-30 … +80 | |||||||||
FKM seals |
°C |
-20 … +80 | ||||||||||
Viscosity range |
mm²/s |
2.8 … 500 | ||||||||||
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 3) |
Class 20/18/15 according to ISO 4406 (c) |
1) | dependent on the attached directional valve |
2) | NG-dependent; see characteristic curves |
3) | The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter. |
Hydraulic fluid |
Classification |
Suitable sealing materials |
Standards |
Data sheet |
|
Mineral oils |
HL, HLP, HLPD, HVLP, HVLPD |
NBR, FKM |
DIN 51524 |
90220 |
|
Bio-degradable 1) |
Insoluble in water |
HETG |
NBR, FKM |
ISO 15380 |
90221 |
HEES |
FKM |
||||
Soluble in water |
HEPG |
FKM |
ISO 15380 |
||
Flame-resistant |
Water-free |
HFDU (glycol base) |
FKM |
ISO 12922 |
90222 |
HFDU (ester base) 1) |
FKM |
||||
Containing water 1) |
HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620) |
NBR |
ISO 12922 |
90223 |
|
Important information on hydraulic fluids: For more information and data on the use of other hydraulicfluids, please refer to the data sheets above or contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.). Flame-resistant - containing water: Life cycle as compared to operation with mineral oil HL, HLP 30 … 100%. Maximum hydraulic fluid temperature 60 °C Bio-degradable and flame-resistant – containing water: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system. |
1) | Not recommended for corrosion-protected version "J3" (contains zinc) |
Hydraulic fluid |
Classification |
Suitable sealing materials |
Standards |
Data sheet |
|
Mineral oils |
HL, HLP, HLPD, HVLP, HVLPD |
NBR, FKM |
DIN 51524 |
90220 |
|
Bio-degradable 1) |
Insoluble in water |
HETG |
FKM |
ISO 15380 |
90221 |
HEES |
FKM |
||||
Soluble in water |
HEPG |
FKM |
ISO 15380 |
||
Flame-resistant |
Water-free |
HFDU (glycol base) |
FKM |
ISO 12922 |
90222 |
HFDU (ester base) 1) |
FKM |
||||
Containing water 1) |
HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620) |
NBR |
ISO 12922 |
90223 |
|
Important information on hydraulic fluids: For further information and data on the use of other hydraulic fluids, please refer to the data sheets above or contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.).Flame-resistant – containing water: Life cycle as compared to operation with mineral oil HL, HLP 30 … 100% Maximum hydraulic fluid temperature 60 °CBio-degradable and flame-resistant: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system. |
1) | Not recommended for corrosion-protected version "J3" (contains zinc) |
For applications outside these parameters, please consult us!
Orifices
Orifice Ø in mm |
Order numbers |
Material numbers |
||||||
M6 conical |
M8 x 1 conical |
G 1/8 conical |
G 1/4 conical |
G 3/8 conical |
G 1/2 conical |
G 1 conical |
||
– |
00 |
– |
– |
– |
– |
– |
– |
– |
0,5 |
05 |
R913040356 |
R913017600 |
R913030187 |
R913040456 |
– |
– |
– |
0,6 |
06 |
R913040358 |
R913017605 |
R913017606 |
R913020197 |
– |
– |
– |
0,7 |
07 |
R913040360 |
R913017609 |
R913046092 |
– |
– |
– |
– |
0,8 |
08 |
R913029447 |
R913017614 |
R913017616 |
R913017615 |
R913040481 |
R913040499 |
– |
1,0 |
10 |
R913019186 |
R913017621 |
R913024679 |
R913017622 |
R913040484 |
R913040500 |
– |
1,2 |
12 |
R913040362 |
R913017627 |
R913017629 |
R913017628 |
R913040486 |
R913040501 |
– |
1,5 |
15 |
R913028337 |
R913017637 |
R913017639 |
R913017638 |
R913040488 |
R913028317 |
– |
1,8 |
18 |
R913030186 |
R913017644 |
R913017646 |
R913017645 |
R913040489 |
R913045913 |
– |
2,0 |
20 |
R913029870 |
R913017651 |
R913040450 |
R913017652 |
R913028417 |
R913028336 |
– |
2,5 |
25 |
R913032543 |
R913035796 |
R913017656 |
R913019582 |
R913040493 |
R913040502 |
– |
3,0 |
30 |
R913040368 |
R913017661 |
R913017663 |
R913017662 |
R913018266 |
R913040503 |
R913040467 |
3,5 |
35 |
– |
R913017667 |
R913040452 |
R913040463 |
R913028318 |
R913019856 |
R913040469 |
4,0 |
40 |
– |
R913017670 |
R913027078 |
R913040464 |
R913018265 |
R913029168 |
R913040470 |
4,5 |
45 |
– |
R913046571 |
R913017671 |
R913040465 |
– |
R913040506 |
– |
5,0 |
50 |
– |
– |
R913017673 |
R913040468 |
R913023871 |
R913019857 |
R913040471 |
5,5 |
55 |
– |
– |
R913027077 |
– |
R913040495 |
R913053659 |
– |
6,0 |
60 |
– |
– |
– |
– |
R913023870 |
R913028418 |
R913020247 |
7,0 |
70 |
– |
– |
– |
R913040461 |
R913017675 |
R913040509 |
– |
7,5 |
75 |
– |
– |
– |
– |
R913023430 |
– |
R913018328 |
8,0 |
80 |
– |
– |
– |
– |
R913046570 |
R913040510 |
R913020246 |
closed |
99 |
R913019128 |
R913019129 |
R913019137 |
R913019136 |
R913019138 |
– |
R913019140 |
Other orifices upon request.
Plug screws |
|
Thread |
Tightening torque MA in Nm ±10 % |
G 1/8 |
12 |
G 1/4 |
30 |
G 3/8 |
55 |
G 1/2 |
80 |
G 3/4 |
135 |
G 1 |
225 |
G 1 1/4 |
360 |
LFA . WEA… (NG16 … 32)
LFA . WEA… (NG40 ... 125)
LFA . WEA… (NG160)
Control cover "WEA" for set-up of a directional valve: NG16 ... 50
Dimensions in mm
1 |
Name plate at NG16, 25, 32 |
2 |
Name plate at NG40 and 50 |
3 |
Port X and Y optionally as threaded ports at NG40 and 50 |
4 |
Directional spool valve type 4WE 6 D… (pilot control valve), separate order |
5 |
Directional seat valve type M-3SEW 6 … (pilot control valve), separate order |
6 |
Porting pattern according to ISO 4401-03-02-0-05 (mounting thread for version "/12" see data sheet 08936) |
NG |
D1 |
H1 |
H2 |
H3 |
L1 |
L2 |
L3 |
L4 |
L5 |
L6 |
L7 |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
||
16 | - | 40 |
- - |
15 | 65 | 80 | - | - | 17 | 47.5 | 4 |
25 | - | 40 |
- - |
24 | 85 | 85 | - | - | 27 | 64 | 4 |
32 | - | 50 |
- - |
28 | 100 | 100 | - | - | 34.5 | 71.5 | 4 |
40 | G1/2 | 60 |
30 - |
32 | 125 | 125 | 72 | 53 | 47 | 84 | 6 |
50 | G1/2 | 68 |
32 - |
34 | 140 | 140 | 80 | 60 | 54.5 | 91.5 | 6 |
Control cover "WEA" for set-up of a directional valve: NG63
Dimensions in mm
1 |
Name plate |
2 |
Port X and Y optionally as threaded ports |
3 |
Directional spool valve type 4WE 10 D… (pilot control valve), separate order |
4 |
Directional seat valve type M-3SEW 10 … (pilot control valve), separate order |
5 |
Porting pattern according to ISO 4401-05-04-0-05 (mounting thread for version "/12" see data sheet 08936) |
Control cover "WEA" for set-up of a directional valve: NG80 ... 100
Dimensions in mm
1 |
Name plate |
2 |
Port X and Y optionally as threaded ports |
3 |
Plug screw at type WEB |
4 |
Plug screw at type WEA |
5 |
Directional spool valve type 4WE 10 D… (pilot control valve), separate order |
6 |
Directional seat valve type M-3SEW 10 … (pilot control valve), separate order |
7 |
Porting pattern according to ISO 4401-05-04-0-05 (mounting thread for version "/12" see data sheet 08936) |
NG |
D1 |
H1 |
H2 |
H3 |
H4 |
L3 |
L4 |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
80 | 250 | 80 | 30 | 45 | 45 | 10 | 16 |
100 | 300 | 100 | 24 | 52.5 | 55 | 13 | 18 |
Control cover "WEA" for set-up of a directional valve: NG125 ... 160
Dimensions in mm
1 |
Name plate |
2 |
Port X and Y optionally as threaded ports |
3 |
Plug screw at type WEB |
4 |
Plug screw at type WEA |
5 |
Directional spool valve type 4WE 10 D… (NG125) or type WEH 25 … (NG160) (pilot control valve), separate order |
6 |
Directional seat valve type M-3SEW 10 … (pilot control valve), separate order |
7 |
Porting pattern according to NG125: ISO 4401-05-04-0-05 NG160: ISO 4401-08-08-0-05(mounting thread for version "/12" see data sheet 08936) |
NG |
D1 |
H1 |
H2 |
H3 |
H4 |
L3 |
L4 |
L5 |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
125 | 380 | 105 | 51 | 56 | 51 | 16 | 10 | 23 |
160 | 480 | 150 | 80 | 71 | 80 | 15 | 15 | 46 |
LFA control cover mounting screws |
||
Hexagon socket head cap screws ISO 4762 - 10.9-flZn/nc/480h/C 1) |
||
Size |
Quantity |
Tightening torque MA in Nm ±10 % |
16 |
4 |
30 |
25 |
4 |
100 |
32 |
4 |
240 |
40 |
4 |
480 |
50 |
4 |
480 |
63 |
4 |
1600 |
80 |
8 |
800 |
100 |
8 |
1600 |
125 |
8 |
3100 |
160 |
12 |
5000 |
1) Hexagon socket head cap screws UNC, see data sheet 08936 |
Mounting screws included in the scope of delivery.
Notice:
The tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %). The specified tightening torques were calculated with total friction coefficient μ = 0.09 … 0.14; adjust in case of modified surfaces. Supplied mounting screws are only suitable for direct assembly on a block. If an intermediate cover is used, mounting screws have to be designed accordingly longer (see dimensions).Size 16 ... 63
Dimensions in mm
Size 80 ... 100
Dimensions in mm
Size 125
Dimensions in mm
Size 160
Dimensions in mm
Installation bore and connection dimensions according to ISO 7368
Size 16 ... 63
Dimensions in mm
1 |
Bore for locating pin |
2 |
80 mm only at control cover for directional valve set-up NG16 (axis X–Y bore) |
Size 80 ... 100
Dimensions in mm
1 |
Bore for locating pin |
Size 125
Dimensions in mm
1 |
Bore for locating pin |
Size 160
Dimensions in mm
Required surface quality of the valve contact surface |
1 |
Bore for locating pin |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
Connection dimensions according to ISO 7368
NG |
16 | 25 | 32 | 40 | 50 | 63 | 80 | 100 | 125 | 160 | |
ØD5 1) |
M8 | M12 | M16 | M20 | M20 | M30 | M24 | M30 | - | - | |
ØD6 |
mm |
4 | 6 | 8 | 10 | 10 | 12 | 16 | 20 | - | - |
ØD7H13 |
mm |
4 | 6 | 6 | 6 | 8 | 8 | 10 | 10 | - | - |
H4 |
mm |
20 | 25 | 35 | 45 | 45 | 65 | 50 | 63 | - | - |
L1 |
mm |
65 80 |
85 - |
102 - |
125 - |
140 - |
180 - |
250 - |
300 - |
- - |
- - |
L2 |
mm |
46 - |
58 - |
70 - |
85 - |
100 - |
125 - |
200 - |
245 - |
- - |
- - |
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) |
Notices:
The specified tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10%). The specified tightening torques were calculated with total friction coefficient μtotal = 0.09 ... 0.14; adjust in case of modified surfaces. Supplied mounting screws are only suitable for direct assembly on a block. If an intermediate cover is used, mounting screws have to be designed accordingly longer.Mounting screws (included in scope of delivery)
Hexagon socket head cap screws ISO 4762 - 10.9-flZn/nc/480h/C 1) |
||
Size |
Quantity |
Tightening torque MA in Nm ±10 % |
16 |
4 |
30 |
25 |
4 |
100 |
32 |
4 |
240 |
40 |
4 |
480 |
50 |
4 |
480 |
63 |
4 |
1600 |
80 |
8 |
800 |
100 |
8 |
1600 |
125 |
8 |
3100 |
160 |
12 |
5000 |
1) | Hexagon socket head cap screws UNC, see data sheet 08936 |
Additional functions with special numbers: Control cover (upon request)
Symbol |
Type |
Size |
Description / special characteristic |
LFA . WEA16-7X/… |
25, 30 |
Additional external ports X and Y (G1/4) |
|
LFA . WEA54-7X/... |
32, 50, 63 |
Cover for logic zero position open |
|
LFA . WEA54-6X/… |
25 ... 50 |
Additional functions with special numbers (upon request)
Orifice symbol
Orifice symbol |
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) |
Orifice selection
Related Products
R900575947
$633.00 USD
R978879409
$963.00 USD
R978862145
$2,059.00 USD
R900462896
$1,118.00 USD
R900058047
$1,675.00 USD