LOGIC COVER LFA50DZWA2-7X/315
Manufacturer: Bosch Rexroth
Material #: R901318922
Model : LFA50DZWA2-7X/315
***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 LFA50DZWA2-7X/315 (R901318922) is a sophisticated hydraulic control device designed for reliable sequencing of pressure in conjunction with way cartridge valves, following the hydraulic symbol DZWA. This unit features manual pressure adjustment, allowing for precise control over sequencing pressure that can be switched off. It is constructed to be mounted onto a subplate with an ISO control cover accommodating way cartridge valves.
With a maximum pressure capacity and compatibility with various hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, and HFC, this model ensures versatility across different hydraulic systems. The seals are made from NBR to maintain integrity under diverse operating conditions. The LFA50DZWA2-7X/315 is engineered to integrate seamlessly into standardized receiving holes according to DIN ISO norms and can be closed with a control cover.
This product allows for the realization of different pressure functions by combining it with appropriate cartridge valves and control covers. Its pilot control valve can be adjusted manually or proportionally if electrically operated (not included). Additionally, the pilot oil supply can be external or internal, providing flexibility in system design.
The LFA50DZWA2-7X/315 enables pressure-dependent connection of secondary systems through its pilot control valve set within the control cover. This feature facilitates efficient management of system pressures and flow paths within various circuit configurations such as unloading low-pressure systems when certain conditions are met or connecting secondary systems based on specific pressure requirements.
The product's robust design ensures long-term performance in demanding applications while offering customization options through its manual actuation and potential electric operation of pilot valves (not included). It represents a critical component in advanced hydraulic systems where precision and reliability are paramount.
$2,897.00 USD
More are expected on April 8, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as April 8, 2025 when ordered in
This product is eligible for factory repair.
Size 50, manual pressure adjustment for sequencing pressure that can be switched off, with installation surface ISO4401
Control cover for 2-way cartridge valves Reliable sequencing of pressure in connection with a 2-way cartridge valve according to the hydraulic symbol.
Unpacked Weight: 9.700 kg
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 sequencing functions
This function enables pressure-dependent connection of a second system.
The required switching pressure is set at the pilot control valve integrated into the control cover.
The pilot oil supply may either be realized externally (pilot oil port X) or internally (from port A via pilot oil ports X or Z2).
The pilot control spring chamber is directed via ports Y or Z1, depressurized to the tank.
Circuit examples
Example 1: (Circuit for pressure-dependent unloading of the low-pressure system)
In the illustrated circuit, the system is supplied via a high-pressure and a low-pressure pump. The system pressure pS acts externally from the high-pressure side via pilot oil port X on the pilot control valve, which sets the low-pressure side to depressurized circulation after the set pressure value is reached. The check valve RV (not included in the scope of delivery) prevents the connection of the high-pressure system with the now depressurized low-pressure system.
On reaching the pressure set at the pilot control spring, the pilot control valve is switched and the spring chamber of the main valve to the tank is unloaded. The main spool is opened and the connection A to B is released.
With the version LFA..DZW..., the required switching position can be selected besides the hydraulic circuit by means of an electrically operated pilot control valve (not included in the scope of delivery of the control cover LFA..DZ...).
Example 2: (Circuit for pressure-dependent connection of a second system)
With this circuit, system 2 is not connected before the pressure in system 1 complies with the specified value. Pilot oil discharge is realized internally from port A of the main valve.
General information on the control cover for the pressure sequencing function
|
01 |
02 |
03 |
04 |
05 |
06 |
07 |
08 |
||
|
LFA |
DZWA |
‒ |
7X |
/ |
|
Type |
||
|
01 |
Control cover LFA |
LFA |
|
Size |
||
|
02 |
NG 16 |
16 |
|
NG 25 |
25 |
|
|
NG 32 |
63 |
|
|
NG 40 |
40 |
|
|
NG 50 |
50 |
|
|
Version |
||
|
03 |
Pressure sequencing function: Solenoid non-energized - DZ function; solenoid energized - open |
DZWA 1) |
|
Adjustment type for pressure adjustment |
||
|
04 |
Rotary knob |
1 |
|
Sleeve with hexagon and protective cap |
2 |
|
|
Lockable rotary knob with scale (H-locking according to automotive standard) |
3 |
|
|
Rotary knob with scale |
4 |
|
|
Component series |
||
|
05 |
Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) |
7X |
|
Pressure rating (max. adjustable sequencing pressure) |
||
|
06 |
Set pressure up to 210 bar |
210 |
|
Set pressure up to 315 bar |
315 |
|
|
Set pressure up to 350 bar |
350 |
|
|
Pilot oil flow |
||
|
07 |
Internal pilot oil supply - internal pilot oil return |
no code |
|
External pilot oil supply - internal pilot oil return |
X |
|
|
Internal pilot oil supply - external pilot oil return |
Y |
|
|
External pilot oil supply - external pilot oil return |
XY |
|
|
Seal material |
||
|
06 |
NBR seals |
no code |
|
FKM seals |
V |
|
| 1) Control covers type LFA..DZ... are combined with 2-way cartridge valves type LC..DB |
Additional preferred types and standard units are specified in the EPS (standard price list).
|
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) |
|
LFA..DZWA.-../ 210 315 350
4 WE 6 D../...
LFA..DZWA.-../ 210 315 350 Y
4 WE 6 D../...
LFA..DZWA.-../ 210 315 350 X
4 WE 6 D../...
LFA..DZWA.-../ 210 315 350 XY
4 WE 6 D../...
Overview (basic symbols), Pressure sequencing function
Attention!
Control covers type LFA..DZ... are combined with 2-way cartridge valves type LC..DB... (see ordering code)
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) |
NG 16 to 50
Dimensions in mm
|
1 |
Adjustment type "2" |
|
2 |
Adjustment type "1" |
|
3 |
Adjustment type "3" |
|
4 |
Adjustment type "4" |
|
5 |
Space required to remove the key |
|
6 |
Locating pin |
|
7 |
Name plate |
|
8 |
Lock nut |
|
9 |
Plug screw M6 conical at DZWA.. |
|
10 |
Plug screw M6 conical at DZWB.. |
|
11 |
Valve mounting screws are included in the scope of delivery of the control cover |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
|
Mounting screws (included in 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 Nm |
|
25 |
4 |
M 12 x 50 |
110 Nm |
|
32 |
4 |
M 16 x 60 |
270 Nm |
|
40 |
4 |
M 20 x 70 |
520 Nm |
|
50 |
4 |
M 20 x 80 |
520 Nm |
|
NG |
Ø Orifice S** 1) |
Ø Orifice X** 1) |
Ø Orifice Y** 1) |
Ø Orifice P** 1) |
H1 |
H3 |
H4 |
L1 |
L2 |
L3 |
L7 |
|
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
||
| 16 | 0.8 | 0.8 | 1 | 1 mm | 40 | 16 | 20 | 65 | 105 | 39.5 | 49 |
| 25 | 0.8 | 0.8 | 1 | 1 mm | 40 | 24 | 20 | 85 | 110 | 53 | 59 |
| 32 | 1 | 1 | 1.2 | 1.2 mm | 50 | 28 | 25 | 100 | 115 | 60.5 | 66.5 |
| 40 | 1 | 1 | 1.2 | 1.2 mm | 60 | 32 | 36 | 125 | 125 | 62.5 | 76.5 |
| 50 | 1 | 1 | 1.2 | 1.2 mm | 68 | 34 | 36 | 140 | 140 | 70 | 84 |
| 1) | Orifice Ø, orifice M6 conical |
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