LFA50KWA-7X/A08
Manufacturer: Bosch Rexroth
Material #: R900964541
Model : LFA50KWA-7X/A08
***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 LFA50KWA-7X/A08 (R900964541) is a sophisticated way cartridge valve designed to provide versatile and efficient flow control within hydraulic systems. This model is engineered for integration into compact block designs, utilizing standardized receiving holes according to ISO specifications for seamless installation. The power section of the valve, which includes connections A and B, is inserted into the control block and sealed with a cover that also serves as the interface for pilot control valves.
This model allows for precise manipulation of pressure, directional, and throttle functions or a combination thereof, through the use of appropriate pilot control valves. The LFA50KWA-7X/A08 can be tailored to match various flow rates across different paths of an actuator, offering cost-effective solutions by combining multiple functions within a single element.
Comprising a control cover and an installation kit, this valve includes essential components such as a bushing, ring (up to NG), valve poppet (with optional damping nose), and closing spring. It may feature additional elements like stroke limitation, hydraulically controlled directional seat valves, or shuttle valves depending on the required function. Electrically operated spool or seat valves are also an option for the control cover.
The functioning of the LFA50KWA-7X/A08 is pressure-dependent with three primary pressurized areas (A1, A2, A3) contributing to its operation. Area ratios between these zones influence the valve's behavior under varying pressures. The spool position is determined by the net force resulting from opening forces (areas A1 and A2) against closing forces (area A3 and spring). Fluid can flow bidirectionally between ports A and B depending on pressurization conditions.
Designed for maximum operating pressures up to bar and accommodating maximum flows up to l/min, this way cartridge valve adapts to different application needs through area ratios, spring options, and cracking pressures from its standard series Size Component series X1 or X2.
$1,869.00 USD
More are expected on April 24, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as April 24, 2025 when ordered in
This product is eligible for factory repair.
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.
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01 |
02 |
03 |
04 |
05 |
06 |
07 |
08 |
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LFA |
KWA |
– |
/ |
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Type |
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01 |
Control cover LFA |
LFA |
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Size |
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02 |
NG 16 |
16 |
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NG 25 |
25 |
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NG 32 |
32 |
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NG 40 |
40 |
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NG 50 |
50 |
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NG 63 |
63 |
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NG 80 |
80 |
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NG 100 |
100 |
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Version |
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03 |
Control cover version "KWA": For set-up of a directional valve |
KWA |
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Component series |
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|
04 |
Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 1) |
7X |
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Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) 2) |
6X |
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Nozzle fitting |
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|
05 |
Orifice in channel A 3) |
A.. |
|
06 |
Orifice in channel P 3) |
P.. |
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07 |
Orifice in channel T 3) |
T.. |
|
08 |
Orifice in channel X 3) |
X.. |
| 1) Component series 7X for sizes 16...63 | |
| 2) Component series 6X for sizes 80 and 100 | |
| 3) 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: X12 = orifice with Ø1.2 mm in channel X. For other orifice Ø, see diagrams/characteristic curves. |
|
Size |
Orifice in the channel |
|||
|
A 3) |
P |
T 3) |
X |
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16 |
A.. |
P15 |
T.. |
X15 |
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25 |
A.. |
P15 |
T.. |
Ø2,0 mm |
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32 |
A.. |
P20 |
T.. |
Ø2,5 mm |
|
40 |
A.. |
P20 |
T.. |
X30 |
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50 |
A.. |
P20 |
T.. |
X30 |
|
63 |
A.. |
P25 |
T.. |
X.. 3) |
|
80 |
A.. |
P25 |
T.. |
X20 |
|
100 |
A.. |
P25 |
T.. |
X20 |
| 3) 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: X12 = orifice with Ø1.2 mm in channel X. For other orifice Ø, see diagrams/characteristic curves. |
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Orifice symbol |
Symbol in ordering code |
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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. |
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Ø1,2 |
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This orifice is designed as bore. No specifications are made in the type designation. (Orifice Ø in mm) |
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|
Z12 |
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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) |
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Notices:
For ordering code of orifices, see "Accessories" Additional functions with special numbers see "Information".
LFA . KWA… (NG16 … 32)
LFA . KWA… (NG40 and 50)
LFA KWA… (NG63)
LFA . KWA… (NG80 … 100)
Control cover "KWA" for set-up of a directional valve: NG16 … 50
Dimensions in mm
|
1 |
Name plate at NG16, 25, 32 |
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2 |
Name plate at NG40 and 50 |
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3 |
Ports Y and Z1 optionally as threaded ports at NG40 and NG50 |
|
4 |
Plug screw type KWB |
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5 |
Plug screw type KWA |
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6 |
Shuttle valve |
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7 |
M6 at NG16 and 40, M8 x 1 at NG50 |
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8 |
Directional spool valve type 4WE 6 D… (pilot control valve), separate order |
|
9 |
Directional seat valve type M-3SEW 6 … (pilot control valve), separate order |
|
10 |
Porting pattern according to ISO 4401-03-02-0-05 (mounting thread for version "/12" see data sheet 08936) |
|
NG |
D1 |
H1 |
H2 |
H3 |
H4 |
H5 |
L1 |
L2 |
L3 |
L4 |
L5 |
L6 |
L7 |
L8 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
||
| 16 | - | 40 | 17 | 15 | - | - | 65 | 80 | 36.5 | - | 17 | 47.5 | - | 4 |
| 25 | - | 40 | 17 | 24 | - | - | 85 | 85 | 45.5 | - | 27 | 64 | - | 4 |
| 32 | - | 50 | 21.5 | 28 | - | - | 100 | 100 | 50 | - | 34.5 | 71.5 | - | 4 |
| 40 | G1/2 | 60 | 30 | 32 | 30 | 30 | 125 | 125 | 62.5 | 53 | 47 | 84 | 62.5 | 6 |
| 50 | G1/2 | 68 | 32 | 34 | 32 | 50 | 140 | 140 | 72 | 60 | 54.5 | 91.5 | 70 | 6 |
Control cover "KWA" for set-up of a directional valve: NG63
Dimensions in mm
|
1 |
Name plate |
|
2 |
Ports Y and Z1 optionally as threaded ports |
|
3 |
Plug screw M8 x 1 at type KWB |
|
4 |
Plug screw M8 x 1 at type KWA |
|
5 |
Shuttle valve |
|
6 |
Directional spool valve type 4WE 10 D… (pilot control valve), separate order |
|
7 |
Directional seat valve type M-3SEW 10 … (pilot control valve), separate order |
|
8 |
Porting pattern according to ISO 4401-05-04-0-05 (mounting thread for version "/12" see data sheet 08936) |
Control cover "KWA" for set-up of a directional valve: NG80 ... 100
Dimensions in mm
|
1 |
Name plate |
|
2 |
Ports Y and Z1 optionally as threaded ports |
|
3 |
Plug screw for type KWB |
|
4 |
Plug screw for type KWA |
|
5 |
Shuttle valve |
|
6 |
Directional spool valve type 4WE 10 D… (pilot control valve), separate order |
|
7 |
Directional seat valve type M-3SEW 10 … (pilot control valve), separate order |
|
8 |
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 |
H5 |
L1 |
L3 |
L6 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
| 80 | 250 | 100 | 19.5 | 45 | 60 | 52 | 55 | 6.5 | 6.5 |
| 100 | 300 | 110 | 27 | 52.5 | 70 | 62 | 62 | 5 | 2 |
|
LFA control cover mounting screws |
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Hexagon socket head cap screws ISO 4762 - 10.9-flZn/nc/480h/C 1) |
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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 |
| 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).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 |
|
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) |
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|
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 |
68 | 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 |
| 100 | 180 | 100 |
100 125 |
135 | M30 | 20 | 10 | 205.5 | 245 | + 0.1 | 210 | + 0.4 | 63 | 29 | 5 | 50 | 5 | 4.5 | 300 | 245 | - | - | - | 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.
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 (upon request)
Additional functions with special numbers: Control cover (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) |
||
|
Symbol |
Type |
Size |
Description / special characteristic |
|
LFA . KWA3-7X/… |
32 … 63 |
|
|
LFA . KWA7-7X//… |
40 … 63 |
As "KWA", spring chamber additionally on "Z2" |
Orifice selection
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