DB20G1-4X/315V/12 W65
Manufacturer: Bosch Rexroth
Material #: R978856439
Model : DB20G1-4X/315V/12 W65
***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 DB20G1-4X/315V/12 W65 (R978856439) is a sophisticated pressure relief valve designed for the precise limitation of operating pressure within hydraulic systems. This pilot-operated valve is essential for maintaining desired pressure levels and preventing potential overpressure conditions that could lead to system damage. The DB20G1-4X/315V/12 W65 features a robust housing and an adjustable pilot control valve, ensuring reliable performance and easy pressure setting adjustments.
The operation of this valve is straightforward: the pressure in channel P influences the main spool, while also acting on the poppet through nozzle bores. When the preset pressure threshold is surpassed, the poppet opens, allowing hydraulic fluid to flow into the spring chamber and subsequently to the tank—either internally or externally, depending on the version used. This action helps maintain a stable operating pressure as dictated by the balance at the main spool, with excess fluid directed from channel P to channel T.
For monitoring purposes, a pressure gauge connection is available to check operating pressures. Additionally, this model offers versatility through its unloading capability or by switching to an alternative second pressure rating via port X. Designed for subplate mounting and conforming to ISO NG 6 and ISO NG 10 porting patterns, it facilitates both threaded connections and various adjustment types such as rotary knobs (with or without scales), sleeves with hexagon and protective cap, or lockable rotary knobs with scales.
This Bosch Rexroth valve has a maximum operating pressure of up to 315 bar and can handle maximum flow rates appropriate for its size category. The combination of advanced design features makes it suitable for a wide range of applications requiring precise pressure control within hydraulic systems.
$717.00 USD
More are expected on April 28, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as April 28, 2025 when ordered in
This product is eligible for factory repair.
Valves of type DB are pilot-operated pressure relief valves. They are used for limitation of the operating pressure.
The valves basically consist of housing (1) and pilot control valve (2) with adjustment type.
The pressure applied to channel P acts on the main spool (3). Via the nozzle bores (4 and 5), the pressure is at the same time applied to poppet (6). If the pressure in channel P exceeds the value set at spring (7), poppet (6) opens against spring (7). Via the nozzle bores (4 and 5), the hydraulic fluid from channel P now flows into the spring chamber (8). From here, it is led into the tank internally (version "–"), via the control line (9 and 10), or externally (version "Y") via the control line (9 and 11).
Due to the state of equilibrium at the main spool (3), hydraulic fluid flows from channel P to channel T, maintaining the set operating pressure.
A pressure gauge connection (12) allows for the control of the operating pressure.
The pressure relief valve can be unloaded or switched to another pressure (second pressure rating) via port X (13).
(measured with HLP46, ϑOil = 40 ±5 °C)
Inlet pressure dependent on the flow
Subplate mounting
Minimum set pressure and circulation pressure dependent on the flow 1)
Standard version
| 1) | The characteristic curves apply to the pressure at the valve output pT = 0 bar across the entire flow range. |
Minimum set pressure and circulation pressure dependent on the flow 1)
Version “U”
| 1) | The characteristic curves apply to the pressure at the valve output pT = 0 bar across the entire flow range. |
Threaded connection
Minimum set pressure and circulation pressure dependent on the flow 1)
Standard version
| 1) | The characteristic curves apply to the pressure at the valve output pT = 0 bar across the entire flow range. |
Minimum set pressure and circulation pressure dependent on the flow 1)
Version “U”
| 1) | The characteristic curves apply to the pressure at the valve output pT = 0 bar across the entire flow range. |
Notices:
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 T.
Type DB…–…
Type DB…X…
Type DB…Y…
Type DB…XY…
Subplate mounting
Size 10
Dimensions in mm
|
|
Required surface quality of the valve contact surface |
|
1 |
Name plate |
|
2 |
Port X for remote control, optional |
|
3 |
Y port for pilot oil return, external |
|
4 |
Adjustment type "1" |
|
5 |
Adjustment type "2" |
|
6 |
Adjustment type "3" |
|
7 |
Adjustment type "7" |
|
8 |
Lock nut SW22, tightening torque MA = 10±5 Nm |
|
9 |
Hexagon SW10 |
|
10 |
Hexagon SW30, tightening torque MA = 50 Nm |
|
11 |
Space required to remove the key |
|
12 |
Locating pin |
|
13 |
Valve mounting bores |
|
14 |
Pressure gauge connection |
|
15 |
Identical seal rings for ports P and T |
|
16 |
Seal ring for port X |
|
28 |
Porting pattern according to ISO 6264-06-09-*-97 |
Valve mounting screws (separate order)
For reasons of stability, exclusively the following valve mounting screws may be used:
4 x ISO 4762 - M12 x 50 - 10.9-flZn-240h-L
with friction coefficient μtotal = 0.09 … 0.14,
tightening torque MA = 75 Nm ± 10 %,
material no. R913000283
Notice:
The tightening torques are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %).
Subplates (separate order) with porting pattern according to ISO 6264-06-09-*-97 see data sheet 45100.
NG25
Dimensions in mm
|
|
|
Required surface quality of the valve contact surface |
|
1 |
Name plate |
|
2 |
Port X for remote control, optional |
|
3 |
Y port for pilot oil return, external |
|
4 |
Adjustment type "1" |
|
5 |
Adjustment type "2" |
|
6 |
Adjustment type "3" |
|
7 |
Adjustment type "7" |
|
8 |
Lock nut SW22, tightening torque MA = 10±5 Nm |
|
9 |
Hexagon SW10 |
|
10 |
Hexagon SW30, tightening torque for screw-in MA = 50 Nm |
|
11 |
Space required to remove the key |
|
12 |
Locating pin |
|
13 |
Valve mounting bores |
|
14 |
Pressure gauge connection |
|
15 |
Identical seal rings for ports P and T |
|
16 |
Seal ring for port X |
|
29 |
Porting pattern according to ISO 6264-08-13-*-97 |
Valve mounting screws (separate order)
For reasons of stability, exclusively the following valve mounting screws may be used:
4 x ISO 4762 - M16 x 50 - 10.9-flZn-240h-L
with friction coefficient μtotal = 0.09 … 0.14,
tightening torque MA = 185 Nm ± 10 %,
material no. R913000378
Notice:
The tightening torques are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %).
Subplates (separate order) with porting pattern according to ISO 6264-08-13-*-97, see data sheet 45100.
Threaded connection
Dimensions in mm
|
1 |
Name plate |
|
2 |
Port X for remote control, optional |
|
3 |
Y port for pilot oil return, external |
|
4 |
Adjustment type "1" |
|
5 |
Adjustment type "2" |
|
6 |
Adjustment type "3" |
|
7 |
Adjustment type "7" |
|
8 |
Lock nut SW22, tightening torque MA = 10±5 Nm |
|
9 |
Hexagon SW10 |
|
10 |
Hexagon SW30, tightening torque MA = 50 Nm |
|
11 |
Space required to remove the key |
|
17 |
Grub screw is omitted with internal pilot oil return |
|
18 |
Directional spool valve NG6 (data sheet 23178) |
|
19 |
Mating connector without circuitry (separate order) |
|
20 |
Mating connector with circuitry (separate order) |
|
21 |
Dimension for valve without manual override |
|
22 |
Dimension for valve with manual override "N" |
|
23 |
Dimension for valve with concealed manual override "N9" |
|
24 |
Housing for version "W“ |
|
25 |
Space required to remove the mating connector |
|
26 |
Valve contact surface; port A is not bored |
|
27 |
Space required to remove the solenoid coil |
|
Version |
D1 |
ØD2 |
|
mm |
||
| DB.10.G | G1/2 | 34 |
| DB.15.G | G3/4 | 42 |
| DB.20.G | G1 | 47 |
Mounting cavity
Version "XY" and type-examination tested safety valves version "Y…E"
Dimensions in mm
| 1) | Installation depth |
|
|
Required surface quality of the valve contact surface |
|
37 |
Bore X, Y and T optionally at the circumference for version "XY" Bore T optionally at the circumference for version "Y" (no separate bore Y required; pilot oil return via bore T) |
|
38 |
Depth of fit |
|
39 |
Bore Ø2.5 mm is only to be bored if required |
|
40 |
Port X does not have to be bored for type-examination tested safety valves version "Y…E" as it does not have any function! |
Version “Y”
Dimensions in mm
| 1) | Installation depth |
|
|
|
Required surface quality of the valve contact surface |
|
37 |
Bore X, Y and T optionally at the circumference for version "XY" Bore T optionally at the circumference for version "Y" (no separate bore Y required; pilot oil return via bore T) |
|
38 |
Depth of fit |
Mating connectors for valves with connector “K4”, without circuitry, standard
3P Z4
Mating connectors for valves with connector “K4”, without circuitry, standard
3P Z4
For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)Data sheet
Spare parts & repair
Mating connectors for valves with connector “K4”, with indicator light
3P Z5L
Mating connectors for valves with connector “K4”, with indicator light
3P Z5L
For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)Data sheet
Spare parts & repair
Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit
3P Z5L1
Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit
3P Z5L1
For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)Data sheet
Spare parts & repair
Mating connectors for valves with connector “K4”, with rectifier
3P RZ5
Mating connectors for valves with connector “K4”, with rectifier
3P RZ5
For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)Data sheet
Spare parts & repair
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