BOSCH REXROTH
R900705728
$814.80 USD
- BOSCH REXROTH
- Material:R900705728
- Model:LC40DB20D7X/V
Quantity in stock: 0
The Bosch Rexroth LC40DB20D7X/V (R900705728) is a sophisticated way cartridge valve designed for pressure functions, including relief, reducing, and sequencing. This pilot-operated valve comes in both seat and spool designs and is intended to be installed into a standardized receiving hole according to DIN ISO specifications. The valve is secured with a control cover that can house a manual or electrically proportional pilot control valve for precise pressure adjustments. For the pressure relief function, the LC40DB20D7X/V operates as a seat valve without an area difference at port B, ensuring that the effective pressure at port A is regulated through the pilot oil supply orifice to the spring side of the element. Once the set pressure is reached, the spool opens, maintaining pressure at port A according to its characteristic curve. When it comes to reducing pressure, this model employs a cartridge valve with an opening characteristic alongside a control cover with a pilot control valve. This setup allows for controlled flow from port A to port B and manages any potential pressure increases on the secondary side by directing them back to the tank. The LC40DB20D7X/V also facilitates pressure sequencing functions essential for connecting secondary systems based on specific pressures. The switching pressure is adjustable via an integrated pilot control valve in the control cover. For circuit integration, this model offers examples like unloading low-pressure systems upon reaching set pressures or connecting secondary systems after achieving predefined values in primary systems. This versatile component has a maximum flow rate as specified by its series classification and can be ordered using its material number R900705728. Its modular design allows for various applications by combining different cartridge valves and control covers to realize desired pressure functions efficiently.
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 relief function
The cartridge valve (1) for the pressure relief function (type LC . DB...) is designed as seat valve without area difference (no effective area at port B). The effective pressure at port A is directed via the pilot oil supply orifice (5) to the spring side (6) of the element. Under the pressure set at the pilot control valve (4), the spool (3) is pressure-compensated and closed by the spring force.
On reaching the set pressure, the spool (3) is opened and the pressure at port A is limited according to the pressure-flow characteristics.
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...).
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.
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01 |
02 |
03 |
04 |
05 |
06 |
07 |
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LC |
DB |
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Type |
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01 |
Cartridge valve |
LC |
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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 |
Pressure relief function |
DB |
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Cracking pressure |
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04 |
Cracking pressure 0 bar (without spring) |
00 |
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Cracking pressure approx. 2 bar |
20 |
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Cracking pressure approx. 3 bar 1) |
30 |
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Cracking pressure approx. 4 bar |
40 |
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Cracking pressure approx. 5 bar (NG16, 25 and 32 only) |
50 |
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Cracking pressure approx. 8 bar 2) |
80 |
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Damping |
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05 |
Seat piston without orifice (standard version) |
E |
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Seat spool piston without orifice (standard version) |
D |
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Seat piston without orifice |
A |
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Piston without precision grooves |
B |
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Component series |
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06 |
Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 3) |
7X |
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Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) 4) |
6X |
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Seal material |
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07 |
NBR seals |
no code |
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FKM seals |
V |
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| 1) Cracking pressure 3.0 bar NG16 only, for set-up of a pilot-operated pressure relief valve type DBC . -5X/…SO187 | |
| 2) Special installation space required (see compression spring dimensions) | |
| 3) Component series 7X for sizes 16...63 | |
| 4) Component series 6X for sizes 80 and 100 | |
Additional preferred types and standard units are specified in the EPS (standard price list).
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Hydraulic fluid |
Classification |
Suitable sealing materials |
Standards |
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Mineral oil |
HL, HLP |
FKM, NBR |
DIN 51524 |
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Bio-degradable |
Insoluble in water |
HEES (synthetic esters) |
FKM |
VDMA 24568 |
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HETG (rape seed oil) |
FKM, NBR |
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Soluble in water |
HEPG (polyglycols) |
FKM |
VDMA 24568 |
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Other hydraulic fluids on request |
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hydraulic
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Size |
16 | 25 | 32 | 40 | 50 | 63 | 80 | 100 | ||
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Maximum operating pressure |
Port A |
bar |
420 | |||||||
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Port B |
bar |
420 | ||||||||
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Maximum flow (recommendation) |
Seat-cartridge valve "E" and "A" |
l/min |
300 | 450 | 600 | 1000 | 1600 | 2500 | 4500 | 7000 |
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Spool-cartridge valve "D" and "B" |
l/min |
175 | 300 | 450 | 700 | 1400 | 1750 | 3200 | 4900 | |
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Hydraulic fluid |
Mineral oil (HL, HLP) according to DIN 51524; fast biodegradable hydraulic fluids according to VDMA 24568 ; HETG (rape seed oil); HEPG (polyglycols); HEES (synthetic esters), other hydraulic fluids on request | |||||||||
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Hydraulic fluid temperature range |
NBR seals |
°C |
-30 … +80 | |||||||
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FKM seals |
°C |
-20 … +80 | ||||||||
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Viscosity range |
mm²/s |
2.8 … 380 | ||||||||
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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. |
For applications outside these parameters, please consult us!
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
manual pressure adjustment
Type LC 16 DB.E… (with seat piston)
manual pressure adjustment
Type LC 16 DB.E… (with seat piston)
manual pressure adjustment
Type LC 16 DB.D… (seat-spool valve)
manual pressure adjustment
Type LC 16 DB.D… (seat-spool valve)
electrically proportional pressure adjustment
Type LC 16 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 16 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 16 DB.D… (seat-spool valve)
electrically proportional pressure adjustment
Type LC 16 DB.D… (seat-spool valve)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
manual pressure adjustment
Type LC 25 DB.E… (with seat piston)
manual pressure adjustment
Type LC 25 DB.E… (with seat piston)
manual pressure adjustment
Type LC 25 DB.D… (with seat-spool piston)
manual pressure adjustment
Type LC 25 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 25 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 25 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 25 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 25 DB.D… (with seat-spool piston)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
manual pressure adjustment
Type LC 32 DB.E… (with seat piston)
manual pressure adjustment
Type LC 32 DB.E… (with seat piston)
manual pressure adjustment
Type LC 32 DB.D… (with seat-spool piston)
manual pressure adjustment
Type LC 32 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 32 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 32 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 32 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 32 DB.D… (with seat-spool piston)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
manual pressure adjustment
Type LC 40 DB.E… (with seat piston)
manual pressure adjustment
Type LC 40 DB.E… (with seat piston)
manual pressure adjustment
Type LC 40 DB.D… (with seat-spool piston)
manual pressure adjustment
Type LC 40 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 40 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 40 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 40 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 40 DB.D… (with seat-spool piston)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
manual pressure adjustment
Type LC 50 DB.E… (with seat piston)
manual pressure adjustment
Type LC 50 DB.D… (with seat-spool piston)
manual pressure adjustment
Type LC 50 DB.E… (with seat piston)
manual pressure adjustment
Type LC 50 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 50 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 50 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 50 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 50 DB.D… (with seat-spool piston)
(measured with HLP46, ϑOil = 40 ±5 °C)
The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.
manual pressure adjustment
Type LC 63 DB.E… (with seat piston)
manual pressure adjustment
Type LC 63 DB.E… (with seat piston)
manual pressure adjustment
Type LC 63 DB.D… (with seat-spool piston)
manual pressure adjustment
Type LC 63 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 63 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 63 DB.E… (with seat piston)
electrically proportional pressure adjustment
Type LC 63 DB.D… (with seat-spool piston)
electrically proportional pressure adjustment
Type LC 63 DB.D… (with seat-spool piston)
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Version "E" |
Version “D” |
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Area ratio |
Area ratio |
Area ratio |
Area ratio |
Installation bore and connection dimensions according to ISO 7368
Dimensions in mm
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1 |
Depth of fit |
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2 |
Control dimension |
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3 |
If a different diameter is used for port B than ØD3 or (ØD3*), the distance from the cover support surface to the bore center must be calculated. |
|
4 |
Port B may be positioned around the central axis of port A. However, it must be observed that the mounting bores and the control bores are not damaged. |
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7 |
At Ø ≤45 mm → Fitting H8 admissible |
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NG |
ØD1 |
ØD2 |
ØD3/(ØD3*) |
ØD4 |
ØD5 |
ØD6 1) |
ØD7 |
H1/(H1*) |
H2 |
H3 |
H4 |
H5 |
H6 |
H7 |
H8 |
H9 |
L1 |
ØL1 |
L2 |
ØL2 |
L3 |
L4 |
L5 |
W |
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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 |
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| 16 | 32 |
H7 - |
16 |
16 25 |
25 |
H7 - |
M8 | 4 | 4 |
H13 - |
34 29.5 |
56 | 43 | - | 20 | 11 | 2 | 20 | 2 | 0.5 |
65 80 |
- | 46 | - | 23 | 25 | 10.5 | 0.05 |
| 25 | 45 |
H7 - |
25 |
25 32 |
34 |
H7 - |
M12 | 6 | 6 |
H13 - |
44 40.5 |
72 | 58 | - | 25 | 12 | 2.5 | 30 | 2.5 | 1 |
85 - |
- | 58 | - | 29 | 33 | 16 | 0.05 |
| 32 | 60 |
H7 - |
32 |
32 40 |
45 |
H7 - |
M16 | 8 | 6 |
H13 - |
52 48 |
85 | 70 | - | 35 | 13 | 2.5 | 30 | 2.5 | 1.5 |
102 - |
- | 70 | - | 35 | 41 | 17 | 0.1 |
| 40 | 75 |
H7 - |
40 |
40 50 |
55 |
H7 - |
M20 | 10 | 6 |
H13 - |
64 59 |
105 | 87 | - | 45 | 15 | 3 | 30 | 3 | 2.5 |
125 - |
- | 85 | - | 42.5 | 50 | 23 | 0.1 |
| 50 | 90 |
H7 - |
50 |
50 63 |
68 |
H7 - |
M20 | 10 | 8 |
H13 - |
72 65.5 |
122 | 100 | - | 45 | 17 | 3 | 35 | 4 | 2.5 |
140 - |
- | 100 | - | 50 | 58 | 30 | 0.1 |
| 63 | 120 |
H7 - |
63 |
63 80 |
90 |
H7 - |
M30 | 12 | 8 |
H13 - |
95 86.5 |
155 | 130 | - | 65 | 20 | 4 | 40 | 4 | 3 |
180 - |
- | 125 | - | 62.5 | 75 | 38 | 0.2 |
| 80 | 145 |
H7 - |
80 |
80 100 |
110 |
H7 - |
M24 | 16 | 10 |
H13 - |
130 120 |
205 | 175 | ± 0.2 | 50 | 25 | 5 | 40 | 5 | 4.5 |
- - |
250 | - | 200 | - | - | - | 0.2 |
| 100 | 180 |
H7 - |
100 |
100 125 |
135 |
H7 - |
M30 | 20 | 10 |
H13 - |
155 142 |
245 | 210 | ± 0.2 | 63 | 29 | 5 | 50 | 5 | 4.5 |
- - |
300 | - | 245 | - | - | - | 0.2 |
| 1) | Maximum dimension |