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Description
- Size 25 … 63
- Component series 7X
- Size 25 … 63
- Component series 7X
Product description
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...).
Type code
Control cover for pressure reducing function
| 01 | 02 | 03 | 04 | 05 | 06 | ||
| LFA | DREV | ‒ | 7X | / | 006 |
| Type | ||
| 01 | Control cover LFA | LFA |
| Size | ||
| 02 | 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) | DREV |
| Component series | ||
| 04 | Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) | 7X |
| Pressure rating (pressure reducing valve) | ||
| 05 | Set pressure up to 7 bar | 006 |
| Seal material | ||
| 06 | 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) | |
Technical data
general
| Size | 25 | 32 | 40 | 50 | 63 |
hydraulic
| Size | 25 | 32 | 40 | 50 | 63 | ||
| Hydraulic fluid | see table | ||||||
| Hydraulic fluid temperature range | NBR seals | °C | -30 … +80 | ||||
| FKM seals | °C | -20 … +80 | |||||
| Viscosity range | mm²/s | 2.8 … 380 | |||||
| Maximum admissible degree of contamination of the hydraulic fluid 1) | Class 20/18/15 according to ISO 4406 (c) | ||||||
| 1) | 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 | |
| Mineral oil | HL, HLP | FKM, NBR | DIN 51524 | |
| Bio-degradable | Insoluble in water | HEES (synthetic esters) | FKM | VDMA 24568 |
| HETG (rape seed oil) | FKM, NBR | |||
| Soluble in water | HEPG (polyglycols) | FKM | VDMA 24568 | |
| Other hydraulic fluids on request | ||||
Control cover
| Size | 25 | 32 | 40 | 50 | 63 | |||
| maximum admissible operating pressure in port ... | ...X (primary pressure) | bar | 350 | |||||
| ...Y (secondary pressure = max. set pressure) | bar | 350 | ||||||
| ...Z2 | static | bar | 315 | |||||
| at pressure control | depressurized (up to ≈ 2 bar) | |||||||
| ...T | static 1) | bar | 100 | |||||
| at pressure control | depressurized (up to ≈ 2 bar) | |||||||
| 1) | according to the admissible tank pressure of the pilot control valves |
(For applications outside these values, please consult us!)
Symbols/Circuit diagrams
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
LFA..DREV-7X/006 NG 25, 32
LFA..DREV-7X/006 NG 40, 50
LFA..DREV-7X/006 NG 63
Dimensions
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) |
| Mounting screws (included in the 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 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 |
NG 25 to 63
Dimensions in mm
| 1) Pressure ratings for valve type: | |
| DBET-5X/... [si]50, 100, 200, 315 and 350 bar[/si][imp]725, 1450, 2900, 4550 and 5100 psi[/imp] | |
| 2) 1 = G 1/4 threaded port T; special cone |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
| NG | H1 | H2 | H3 | L1 | L2 | L3 | L7 |
| mm | mm | mm | mm | mm | mm | mm | |
| 25 | 40 - | 19 - | 24 | 85 - | 85 | 49 | 59 |
| 32 | 50 - | 26 - | 28 | 100 - | 100 | 56.5 | 66.5 |
| NG | Ø Orifice A** | Ø Orifice F** 1) | Ø Orifice D** | L1 | L2 | L8 | L9 |
| mm | mm | mm | mm | mm | mm | mm | |
| 25 | - | 0.8 | 1.5 2) | 85 | 85 | 15 | 42 |
| 32 | - | 1 | 1.5 2) | 100 | 100 | 7.5 | 35 |
| 40 | - | 1.2 | 1.8 2) | 125 | 125 | - | 22 |
| 50 | - | 1.5 | 1.8 2) | 140 | 140 | - | 15 |
| 63 | 2 1) | 1.5 | 1.8 1) | 180 | 180 | - | - |
| 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 |
Downloads
 | 2-way cartridge valves, pressure functions Data Sheet | RE21050 | 2003-02-01 | English | PDF | 893k Product Groups: Logic elements - pressure function Type LC (cartridge valves), type LFA (control cover) |
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