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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 | DREWZ | ‒ | 7X | / | 014 |
| 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) | DREWZ |
| 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 16 bar | 014 |
| 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).
(basic symbol) - Pressure reducing function
LFA..DREWZ-7X/014 NG 25, 32
LFA..DREWZ-7X/014 NG 40, 50
LFA..DREWZ-7X/014 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
| 8 | Pressure reducing valve (included in the scope of delivery) |
| 11 | Valve mounting screws M5 DIN 912-10.9 MA = 8.9 Nm included in the scope of delivery |
| 14 | Control cover |
| 16 | Proportional pressure relief valve type DBET-5X/... 1) Y G24-12) (to be ordered separately) |
| 17 | Directional spool valve 3WE 6 A... (to be ordered separately) |
| 1) Pressure ratings for valve type: | |
| DBET-5X/... 50, 100, 200, 315 and 350 bar | |
| 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 | L10 |
| mm | mm | mm | mm | mm | mm | mm | mm | |
| 25 | - | 0.8 | 1.5 2) | 85 | 85 | 15 | 42 | 30 |
| 32 | - | 1 | 1.5 2) | 100 | 100 | 7.5 | 35 | 37.5 |
| 40 | - | 1.2 | 1.8 2) | 125 | 125 | - | 22 | 50 |
| 50 | - | 1.5 | 1.8 2) | 140 | 140 | - | 15 | 57.5 |
| 63 | 2 1) | 1.5 | 1.8 1) | 180 | 180 | - | - | 81.5 |
| 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 |
Accessories
Directional spool valves, direct operated, with solenoid actuation
WE 6...E
Directional spool valves, direct operated, with solenoid actuation
WE 6...E
- Size 6
- Component series 6X
- Maximum operating pressure 350 bar
- Maximum flow (DC) 80 l/min
- Maximum flow (AC) 60 l/min
4/3, 4/2 and 3/2 directional valve with wet-pin DC solenoids
WE 6...E...407
4/3, 4/2 and 3/2 directional valve with wet-pin DC solenoids
WE 6...E...407
- Size 6
- Component series 6X
- Maximum operating pressure 315 bar
- Maximum flow 60 l/min
Directional spool valves, direct operated, with solenoid actuation
WE 6...E...UR
Directional spool valves, direct operated, with solenoid actuation
WE 6...E...UR
- Solenoid coil is an approved component with UR-marking according to UL 906
- Size 6
- Component series 6X
- Maximum operating pressure 350 bar
- Maximum flow (DC) 80 l/min
- Maximum flow (AC) 60 l/min
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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