LOGIC COVER LFA50DB2-7X/310NE
Manufacturer: Bosch Rexroth
Material #: R901412473
Model : LFA50DB2-7X/310NE
***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 LFA50DB2-7X/310NE (R901412473) is a sophisticated pressure relief valve designed for subplate mounting and manual pressure adjustment. This valve is part of the Typeexamination tested safety valves type LFA, which complies with the Pressure Equipment Directive EU and operates as a pilot-operated 3-way cartridge valve in a seat design. The product features a reliable pressure limitation unit integrated into its control cover, ensuring that the pressure is effectively limited in conjunction with a way cartridge valve.
The LFA50DB2-7X/310NE has been meticulously engineered to fit installation bores according to ISO standards, and it comes with a factory nozzle fitting that must not be altered to maintain its integrity and performance. The valve's construction includes a cartridge valve designed as a seat valve without an area difference, which increases operational safety by preventing internal leakage from the spring chamber to port B.
This model is capable of handling maximum operating pressures up to bar and can accommodate maximum flow rates of l/min. The pressure limitation unit is available with an optional rotary knob for easy manual adjustment of the pressure setting without affecting the set relief pressure, facilitating regular functional tests.
With its hexagon type actuation for manual pressure adjustment and NBR seals suitable for various hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, HFC, this Bosch Rexroth valve is designed for reliability and ease of use. The product also offers different response pressure adjustment types and can be ordered with an optional sealable valve mounting set as accessories. With its size component series X designation, this model exemplifies Bosch Rexroth's commitment to quality in hydraulic components.
$4,679.00 USD
More are expected on April 7, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as April 7, 2025 when ordered in
This product is eligible for factory repair.
Size 50, manual maximum pressure adjustment
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: 10.750 kg
Installation bore according to ISO 7368 (main pressure relief valve) Response pressure 50 ... 400 bar adjustment types, optionally:
- Hexagon
- Rotary knob Valve mounting set (sealable) as accessories
General
Type-examination tested safety valves type LFA . DB…E according to Pressure Equipment Directive 2014/68/EU are pilot-operated 2-way cartridge valves in seat design with set relief pressure setting pmax.
The complete valve generally consists of one cartridge valve (1) for installation bores according to ISO 7368 and one respective control cover (2) with integrated sealed pressure limitation unit (4).
The factory nozzle fitting (9) ("X", "F") as well as the installed compression spring (10) must not be changed.
The installation position ("D") is not fitted. The cartridge valve (1) is designed as seat valve without area difference. The relief pressure effective at port A is directed to the spring chamber (6) of the cartridge valve (1) and to the pressure limitation unit (4) via channel X (5). The piston sealing (7) prevents an internal leakage from the spring chamber (6) to port B and thus increases the operational safety by avoiding gap filtration. Under the pressure value set at the pressure limitation unit (4), the spool (3) is pressure-compensated and remains closed in a seat-tight manner due to the spring force of the compression spring (10). The pressure equilibrium at the spool (3) is only changed when the relief pressure at port A is reached, namely by opening the pressure limitation unit (4), so that excessive hydraulic fluid directly flows to
channel B via the spool (3) and the pressure in A is limited to the set pressure value.
The pressure limitation unit (4) is optionally available with rotary knob. This allows for a manual reduction of the pressure adjustment without changing the relief pressure setting. This simplifies a regular functional test.
Admissible flow ranges – size 40
Mineral oil
(measured with HLP46, ϑOil = 40 ±5 °C)
Other approved hydraulic fluids (see "Technical data")
(simulated; kinetic viscosity 40 mm²/s)
Admissible flow ranges – size 50
Mineral oil
(measured with HLP46, ϑOil = 40 ±5 °C)
Other approved hydraulic fluids (see "Technical data")
(simulated; kinetic viscosity 40 mm²/s)
Admissible flow ranges – size 63
Mineral oil
(measured with HLP46, ϑOil = 40 ±5 °C)
Other approved hydraulic fluids (see "Technical data")
(simulated; kinetic viscosity 40 mm²/s)
Notes:
The flow values only apply for depressurized pilot oil return. Operating points in the gray areas of the characteristic curves are not admissible with this valve. Observe the admissible flows of the overall system.
Dimensions in mm
|
1 |
Name plate |
|
2 |
Locating pin |
|
3 |
Pilot control valve, adjustment type "2" |
|
4 |
Pilot control valve, adjustment type "1" |
|
5 |
For valve mounting set, see below |
|
6 |
External connections |
|
NG |
H1 |
H2 |
H3 |
H4 |
H5 |
H6 |
▢ L1 |
L2 |
L3 |
L4 |
L5 |
D1 |
D2 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|||
| 40 | 60 | 32 | 27 | 69 | 105 | 28 | 125 | 89 | 76 | 60 | 68 | G1/4 | G1/4 |
| 50 | 60 | 34 | 31 | 67 | 122 | 23 | 140 | 105 | 84 | 70 | 79 | G1/2 | G1/4 |
| 63 | 82 | 50 | 40 | 91 | 155 | 30 | 180 | 144 | 90 | 90 | 90 | G1/2 | G1/2 |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
Valve mounting set (separate order)
|
Size |
Quantity |
Comprising: |
Material number |
|
40, 50 |
4 |
Hexagon socket head cap screw ISO 4762 - M20 x 80 - 10.9-flZn/nc/480h/C (thereof 1 special screw with bore) Tightening torque MA = 480 Nm ±10 % |
R901362574 |
|
1 |
Sealing material |
||
|
63 |
4 |
Hexagon socket head cap screw ISO 4762 - M30 x 110 - 10.9-flZn/nc/480h/C (thereof 1 special screw with bore) Tightening torque MA = 1600 Nm ±10 % |
R901362575 |
|
1 |
Sealing material |
Notices:
For reasons of stability, exclusively the specified valve mounting screws may be used. The specified tightening torques were calculated with total friction coefficient μtotal = 0.09 ... 0.14; adjust in case of modified surfaces. The specified tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10%).Installation bore and connection dimensions according to ISO 7368 (main pressure relief valve)
|
1 |
Depth of fit |
|
2 |
Port B can be positioned arbitrarily, radially to port A, observing the tapped holes and pilot oil bores. |
|
3 |
Bore for locating pin |
|
NG |
40 | 50 | 63 | |
|
ØD1H7 |
mm |
75 | 90 | 120 |
|
ØD2 |
mm |
40 | 50 | 63 |
|
ØD3 |
mm |
40 | 50 | 63 |
|
ØD3 max 1) |
mm |
50 | 63 | 80 |
|
ØD4H7 |
mm |
55 | 68 | 90 |
|
D5 |
M20 | M20 | M30 | |
|
ØD6 |
mm |
10 | 10 | 12 |
|
ØD7H13 |
mm |
6 | 8 | 8 |
|
H1 |
mm |
84.5 | 97.5 | 127 |
|
H2 |
mm |
105 | 122 | 155 |
|
mm |
+ 0.1 | + 0.1 | + 0.1 | |
|
H3 |
mm |
87 | 100 | 130 |
|
mm |
± 0.3 | ± 0.3 | ± 0.3 | |
|
H4 |
mm |
45 | 45 | 65 |
|
H5 |
mm |
15 | 17 | 20 |
|
H6 |
mm |
3 | 3 | 4 |
|
H7 |
mm |
30 | 35 | 40 |
|
H8 |
mm |
3 | 4 | 4 |
|
H9 |
mm |
2.5 | 2.5 | 3 |
|
L1 |
mm |
125 | 140 | 180 |
|
L2 |
mm |
85 | 100 | 125 |
|
L3 |
mm |
42.5 | 50 | 62.5 |
|
L4 |
mm |
50 | 58 | 75 |
|
L5 |
mm |
23 | 30 | 38 |
|
U |
mm |
0.05 | 0.05 | 0.05 |
|
Ro max |
mm |
4 | 4 | 4 |
|
Ru max |
mm |
1 | 1 | 1 |
| 1) | Recommendation deviating from the standard. |
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