Manufacturer: Bosch Rexroth
Material #: R978898438
Model : DB10-3-4X/350/12 W65
$932.00 USD
More are expected on August 20, 2026
Note: Sales tax, shipping, and applicable tariffs will be calculated at checkout.| Qty | Price | Savings |
|---|---|---|
| 5-24 | $908.70 USD | $23.30 USD |
| 25+ | $885.40 USD | $46.60 USD |
Status: This product is temporarily out of stock.
Qty: Delivered as early as August 20, 2026 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 |
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