***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 DBA30H2N1X/180E (R901126760) is a sophisticated pump safety block designed to be directly mounted onto the SAE pressure port of pumps. It functions as a pilot-operated pressure relief valve, primarily aimed at limiting the operational pressure within hydraulic systems. The unit comprises a valve block, a main spool insert, and a pilot control valve which facilitates precise pressure adjustments.
This model features a P port for hydraulic fluid input and an output port P, with the main spool insert located in between. This spool opens to connect to the T tank line when necessary. The DBA30H2N1X/180E operates by utilizing the pressure in the throughbore, which acts on both the main spool and ball in the pilot control valve through control lines equipped with nozzles.
When system pressure exceeds a predetermined setting on spring , the ball opens against its spring tension, allowing fluid from the main spool's spring-loaded side to flow into the tank, either internally or externally depending on type. This process helps maintain set operating pressures while allowing fluid flow from channel P to channel T.
Additionally, this pump safety block can be remotely controlled via port , and if required for connection to a pressure load cell or gauge shutoff valve, a specific version without nozzle (SO) should be selected to prevent delays or drops in pressure during operation.
The DBA30H2N1X/180E also offers an integrated check valve option that maintains system pressure when disconnected from the pump and negates the need for a separate check valve. It enables zero-pressure startup and efficient pump circulation with quick pressure buildup. Users can choose from various adjustment types for setting pressure including rotary knobs and lockable versions with scales. Furthermore, this model allows solenoid-actuated unloading through an additional directional valve and comes in size 30 with component series X capable of handling maximum operating pressures up to bar and maximum flow rates of l/min.
$2,001.00 USD
More are expected on April 21, 2025
Status: This product is temporarily out of stock.
Qty: Delivered as early as April 21, 2025 when ordered in
This product is eligible for factory repair.
Zero-pressure start-up and circulation of the pump For direct mounting to the SAE pressure port of the pump Quick pressure build-up 4 adjustment types for pressure adjustment, optionally
• Rotary knob
• Sleeve with hexagon and protective cap
• Lockable rotary knob with scale
• Rotary knob with scale 5 pressure ratings, optional Solenoid-actuated unloading via a built-on directional valve Integrated check valve, optional
Pump safety blocks of type DBA are pilot-operated pressure relief valves which are integrated into a block and intended to be mounted directly onto the SAE pressure port of pumps.
They are used for limiting the operating pressure. The pump safety blocks basically consist of a valve block (1), main spool insert (3) and pilot control valve (2) with adjustment type for pressure adjustment. The valve housing has a port P for the hydraulic fluid input and port P1 for the output. In a branch of the through-bore between these two ports there is the main spool insert. When this is open there is a connection to port T (tank line).
Pump safety block type DBA
The pressure applied in the through-bore acts on the main spool (3). At the same time, pressure is applied to the spring-loaded side of the main spool (3) and to the ball (8) in the pilot control valve (2) via the control lines (6) and (7) which are equipped with nozzles (4) and (5). If the pressure in the through-bore exceeds the value set at spring (9), ball (8) opens against spring (9).
The signal for this is provided internally from the through-bore via control lines (10) and (6). The hydraulic fluid on the spring-loaded side of main spool (3) now flows via the control line (7), nozzle bore (11) and ball (8) into the spring chamber (12). From here, it is fed into the tank, either internally for type DBA …– via control line (13), or externally for type DBA …Y via control line (14). Nozzles (4) and (5) cause a pressure drop to occur at the main spool (3), hence the connection from channel P to channel T opens. The hydraulic fluid now flows from channel P to channel T, whilst the set operating pressure is maintained.
Port (15) can be used for remote control purposes. If a pressure load cell or a pressure gauge shut-off valve is to be connected here, then version SO616 – without nozzle (4) – must be ordered. This prevents delays in the pressure build-up or brief pressure drops when the pressure gauge shut-off valve is operated.
Pump safety block type DBAR (with check valve)
The integrated check valve maintains the system pressure when the pump is disconnected and prevents the hydraulic fluid from returning to the pump. If this valve is selected, no separate check valve is needed.
01 |
02 |
03 |
04 |
05 |
06 |
07 |
08 |
09 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
|
DBA |
1X |
/ |
* |
01 |
Pump safety block |
DBA |
02 |
Without directional valve |
no code |
03 |
Without check valve |
no code |
With check valve |
R 1) |
|
04 |
Size 32 |
30 |
Size 40 |
40 |
|
Connection / SAE flange 2) |
||
06 |
Standard flange (200 … 350 bar) |
F |
High-pressure flange (350 bar) |
H |
|
Adjustment type for pressure adjustment |
||
07 |
Rotary knob |
1 |
Sleeve with hexagon and protective cap |
2 |
|
Lockable rotary knob with scale |
3 3) |
|
Rotary knob with scale |
7 |
|
08 |
With main spool Ø24 mm |
– |
With main spool Ø28 mm |
N |
|
09 |
Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) |
1X |
Pressure rating |
||
10 |
Set pressure … 50 bar |
50 |
Set pressure … 100 bar |
100 |
|
Set pressure … 200 bar |
200 |
|
Set pressure … 250 bar |
250 |
|
Set pressure … 315 bar |
315 |
|
Set pressure … 350 bar (only version “H”) |
350 |
|
Pilot flow |
||
11 |
Pilot oil supply and pilot oil return internal (standard) |
– 4) |
Internal pilot oil supply, external pilot oil return |
Y |
|
12 |
Standard version |
no code |
Valve for minimum cracking pressure (not suitable for mutual relief!) |
U |
|
13 |
Without switching shock damping |
no code |
14 |
Without directional valve |
no code |
16 |
Without manual override |
no code |
Electrical connection |
||
17 |
Without mating connector, with connector DIN EN 175301-803 |
K4 5) |
Seal material |
||
19 |
NBR seals |
no code |
FKM seals |
V |
|
(other seals upon request) Attention! Observe compatibility of seals with hydraulic fluid used! |
||
Type-examination procedure |
||
20 |
Without type-examination procedure |
no code |
Type-examination tested safety valve according to PED 2014/68/EU |
E |
|
21 |
Further details in the plain text |
* |
1) Only … 315 bar | |
2) Please observe the pressure ratings and connection dimensions! (see dimensions). | |
3) H-key with material no. R900008158 is included in the scope of delivery. | |
4) Hyphen “–” only required if 12 and 13 = “no code” | |
5) Mating connectors, separate order. | |
Preferred types and standard units are contained in the EPS (standard price list).
general
Size |
32 | 40 | ||
Weight |
kg |
8 | 11.4 | |
Check valve "R" |
kg |
0.3 | 0.4 | |
Switching shock damping "S" |
kg |
0.6 | ||
Installation position |
any | |||
Ambient temperature range |
NBR seals |
°C |
-30 … +80 | |
FKM seals |
°C |
-15 … +80 | ||
Minimum stability of the housing materials |
Housing materials are to be selected so that there is sufficient safety for all imaginable operating conditions (e.g. with regard to pressure resistance, thread stripping strengths and tightening torques). |
Hydraulic fluid |
Classification |
Suitable sealing materials |
Standards |
|
Mineral oils and related hydrocarbons |
HL, HLP, HLPD
|
NBR, FKM |
DIN 51524 |
|
Bio-degradable |
Insoluble in water |
HETG |
NBR, FKM |
VDMA 24568
|
HEES |
FKM |
|||
Soluble in water |
HEPG |
FKM |
VDMA 24568
|
|
Containing water |
Water-free |
HFDU, HFDR |
FKM |
ISO 12922
|
Containing water |
HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620) |
NBR
|
ISO 12922 |
|
Important information on hydraulic fluids! For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us! There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)!Flame-resistant – containing water: Maximum operating pressure 210 bar Maximum hydraulic fluid temperature 60 °C Expected life cycle as compared to HLP hydraulic oil 30 % to 100 % |
Technical data for directional seat valves see data sheet 22058, directional spool valves data sheet 23178.
Also see Deviating technical data for type-examination tested safety valves.
hydraulic
Maximum counter pressure |
Port Y |
bar |
0 |
Port T |
bar |
10 | |
Maximum flow |
See ordering code, safety instructions and characteristic curves "Type-examination tested safety valve" | ||
Hydraulic fluid |
Mineral oil (HL, HLP) to DIN 51524 | ||
Hydraulic fluid temperature range |
NBR seals |
°C |
-20 … +60 |
FKM seals |
°C |
-15 … +60 | |
Viscosity range |
mm²/s |
12 … 230 |
hydraulic
Size |
32 | 40 | ||
Maximum operating pressure |
Port P |
bar |
350 | |
Port T |
bar |
315 | ||
Cracking pressure |
(with DBAR...) |
bar |
0.5 | |
Maximum counter pressure |
Port Y |
bar |
315 | |
Maximum set pressure |
bar |
50 100 200 315 350 |
||
Minimum set pressure |
flow-dependent, see characteristic curves | |||
Maximum flow |
DBA, DBAR |
l/min |
600 350 |
650 450 |
Hydraulic fluid |
see table | |||
Hydraulic fluid temperature range |
NBR seals |
°C |
-30 … +80 | |
FKM seals |
°C |
-15 … +80 | ||
Viscosity range |
mm²/s |
10 … 800 | ||
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!
Deviating technical data: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/E C1)
(measured with HLP46, ϑOil = 40 ±5 °C)
Standard version
Minimum set pressure and circulation pressure dependent on the flow
Notice!
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.
The characteristic curves apply to the pressure at the valve output pT = 0 baracross the entire flow range.Version “U”
Minimum set pressure and circulation pressure dependent on the flow
Inlet pressure dependent on the flow
Maximum admissible flow qV max dependent on the counter pressure pT in the discharge line with internal pilot oil return
Type DBA 30 …-1X/…E
Characteristic curves for intermediate values can be generated by interpolation.
Further explanations see explanation of the diagrams
Type DBA 40 …-1X/…E
pA |
Response pressure in bar |
pT |
maximum admissible counter pressure in bar) (sum of all possible counter pressures; also see AD2000 - data sheet A2) |
maximum admissible flow in l/min |
|
10 % x pA (with qV = 0) according to PED 97/23/EC |
Explanation of the diagram |
|
(Example: type DBA…E, above): |
|
known: |
Flow of the system/accumulator that has to be secured qVmax = 320 l/min |
Set response pressure of the safety valve pA = 350 bar |
|
unknown: |
pTadmissible |
Solution: |
see arrows in diagram above |
pT admissible (320 l/min; 350 bar) = 16.2 bar |
Type DBA …–..
Type DBA …Y..
Type DBAR …–..
Type DBAR …Y..
With directional spool valve
Dimensions in mm
1 |
Name plate |
2 |
Omitted with internal pilot oil return |
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 |
Hexagon SW10 |
9 |
Switching shock damping sandwich plate, optional |
10 |
Space required to remove the key |
11 |
Space required to remove the mating connector |
12 |
Valve mounting bores |
13.1 |
Directional spool valve NG6 |
14 |
Solenoid “a” |
15 |
Optional auxiliary operating device |
16 |
Mating connector without circuitry (separate order) |
17 |
Mating connector with circuitry (separate order) |
18 |
Seal ring |
19 |
Integrated check valve, version "R" |
20 |
Dimension for valve without manual override |
21 |
Dimension for valve with concealed manual override "N9" |
22 |
Dimension for valve with manual override "N" |
23 |
Space required to remove the coil |
24 |
Lock nut SW17, tightening torque MA = 10+5 Nm |
With directional seat valve
Dimensions in mm
1 |
Name plate |
2 |
Omitted with internal pilot oil return |
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 |
Hexagon SW10 |
9 |
Switching shock damping sandwich plate, optional |
10 |
Space required to remove the key |
11 |
Space required to remove the mating connector |
12 |
Valve mounting bores |
13.2 |
Directional seat valve NG6 |
14 |
Solenoid “a” |
15 |
Optional auxiliary operating device |
16 |
Mating connector without circuitry (separate order) |
17 |
Mating connector with circuitry (separate order) |
18 |
Seal ring |
19 |
Integrated check valve, version "R" |
23 |
Space required to remove the coil |
24 |
Lock nut SW17, tightening torque MA = 10+5 Nm |
Standardflansche, Ausführung „DBA(R)…F“
Version |
L1 |
L2 |
L3 |
L4 |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
H1 |
H2 |
H3 |
H4 |
H5 |
H6 |
ØD1 |
ØD3 |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
DBA32...F | 121 | 138 | 55 | 38.5 | 30.2 | 58.7 | 65 | 48.3 | - | - | 105 | 125 | 43 | 85 | 43 | - | 11 | 45 |
DBA40...F | 138 | 156 | 54.5 | 49.5 | 35.8 | 69.9 | 74.5 | 54.7 | - | - | 118 | 138 | 50 | 98 | 56 | - | 13 | 54 |
DBAR32...F | 121 | 138 | 55 | 38.5 | 30.2 | 58.7 | 65 | 48.3 | 60 | 80 | 105 | 125 | 43 | 85 | 43 | 9 | 11 | 40 |
DBAR40...F | 138 | 156 | 54.5 | 49.5 | 35.8 | 69.9 | 74.5 | 54.7 | 60 | 100 | 118 | 138 | 50 | 98 | 56 | 8 | 13 | 54 |
NG |
Version |
Ports |
4 valve mounting screws ISO 4762 - 10.9 1) |
Tightening torqueMA in Nm 2) |
||
P and P1 |
T |
Part number |
||||
32 |
„DBA“ |
SAE 1 1/4“ |
G1 1/4 |
M10 x 120 |
R913000074 |
52 |
„DBAR“ |
M10 x 125 |
R913000668 |
||||
40 |
„DBA“ |
SAE 1 1/2“ |
G1 1/2 |
M12 x 135 |
R913024229 |
77 |
„DBAR“ |
M12 x 140 |
R913000312 |
High-pressure flanges, version “DBA(R)…H“
Version |
L1 |
L2 |
L3 |
L4 |
B1 |
B2 |
B3 |
B4 |
B5 |
B6 |
H1 |
H2 |
H3 |
H4 |
H5 |
H6 |
ØD1 |
ØD3 |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
mm |
|
DBA32...H | 121 | 138 | 55 | 38.5 | 31.8 | 66.7 | 65 | 48.3 | - | - | 105 | 125 | 43 | 85 | 43 | - | 15 | 45 |
DBA40...H | 138 | 156 | 54.5 | 49.5 | 36.6 | 79.4 | 74.5 | 54.7 | - | - | 118 | 138 | 50 | 98 | 56 | - | 17 | 54 |
DBAR32...H | 121 | 138 | 55 | 38.5 | 31.8 | 66.7 | 65 | 48.3 | 60 | 90 | 105 | 125 | 43 | 85 | 43 | 8 | 15 | 40 |
DBAR40...H | 138 | 156 | 54.5 | 49.5 | 36.6 | 79.4 | 74.5 | 54.7 | 65 | 110 | 118 | 138 | 50 | 98 | 56 | 8 | 17 | 54 |
NG |
Version |
Ports |
4 valve mounting screws ISO 4762 - 10.9 1) |
Tightening torqueMA in Nm 2) |
||
P and P1 |
T |
Part number |
||||
32 |
„DBA“ |
SAE 1 1/4“ |
G1 1/4 |
M14 x 135 |
R913024230 |
113 |
„DBAR“ |
M14 x 145 |
R913024233 |
||||
40 |
„DBA“ |
SAE 1 1/2“ |
G1 1/2 |
M16 x 155 |
R913024234 |
184 |
„DBAR“ |
M16 x 160 |
R913000354 |
1)Valve mounting screws (separate order) | |
4 hexagon socket head cap screws ISO 4762 - 10.9-flZn-240h-L | |
(with friction coefficient μtotal = 0.09 … 0.14) | |
Attention! | |
For reasons of stability, other valve mounting screws must not be used! | |
2) The tightening torques are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %). |
Admissible pressures (flange connections according to DIN ISO 6162-2)
Pressure |
|
bar |
|
SAE 1 1/4″ | 250 |
SAE 1 1/2″ | 200 |
Admissible pressures (flange connections according to DIN ISO 6162-2)
Pressure |
|
bar |
|
SAE 1 1/4″ | 350 |
SAE 1 1/2″ | 350 |
Safety instructions: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/EC
Before ordering a type-examination tested safety valve, it must be ensured that at the desired response pressurep, the maximum admissible flowqV max (= numerical value at the position of letter "G" in the component marking) of the safety valve is higher than the maximum possible flow of the system/accumulator to be secured. In this respect, the applicable regulations must be observed! According to PED 97/23/EC, the increase in the system pressure due to the flow must not exceed 10 % of the set response pressure (see component marking).The maximum admissible flow qV max stated in the component marking must not be exceeded.
Discharge lines of safety valves must end in a risk-free manner. The accumulation of fluids in the discharge lines must not be possible (see AD2000 - data sheet A2).
With version "B", the lowest adjustable pressure (circulation pressure) is set in case of power failure or cable break. With version "A", the pressure limiting function is set in case of power failure or cable break. Hydraulic counter pressures in port T with internal pilot oil return and/or port Y with external pilot oil return add 1:1 to the response pressure of the valve set at the pilot control.Example:
Pressure adjustment of the valve due to spring pretensioning (item 9 on page 5) in the pilot control valve/adjustment type
pspring = 200 bar
Hydraulic counter pressure in port T with internal pilot oil return
phydraulic = 50 bar
=> response pressure= pspring+ phydraulic = 250 bar
It is imperative to observe the application notes!
In the plant, the response pressure specified in the component marking is set at a flow of 2 l/min. The maximum admissible flow specified in the component marking applies to:External pilot oil return “Y” without counter pressure in the pilot oil return line, admissible counter pressure in the discharge line (port T) <15 bar
Internal pilot oil return "–“ without counter pressure in the discharge line (port T) With internal pilot oil return, the system pressure increases by the counter pressure in the discharge line (port T) due to the increasing flow (observe AD2000 - data sheet; A2, item 6.3).
To ensure that this increase in system pressure caused by the flow does not exceed the value of 10 % of the set response pressure, the admissible flow has to be reduced dependent on the counter pressure in the discharge line (port T) (see characteristic curves Safety instructions, Type-examination tested safety valves).
By removing a lead seal at the safety valve, the approval according to the PED becomes void Basically, the requirements of the Pressure Equipment Directive and of data sheet AD2000 A2 have to be observed!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
Ordering code: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/EC
NG |
Type designation |
Component marking |
Maximum flow qVmax in l/min with pilot oil return |
Set response overpressurep in bar |
|
external "Y" |
internal "–" |
||||
32 |
2 3 4 5 6 DBA 30 ▢▢N1X/▢▢▢E |
TÜV.SV.▢–938.22.F.G.p |
200 |
175 |
30 ... 60 |
2 3 4 5 6 DBAR 30 ▢▢N1X/▢▢▢E |
400 |
260 |
61 ... 110 |
||
40 |
2 3 4 5 6 DBA 40 ▢▢N1X/▢▢▢E |
TÜV.SV.▢–939.22.F.G.p |
350 |
300 |
30 ... 60 |
2 3 4 5 6 DBAR 40 ▢▢N1X/▢▢▢E |
450 |
350 |
61 ... 110 |
2 |
Standard flange |
F |
High-pressure flange |
H |
|
Adjustment type |
||
3 |
Hand wheel (pressure adjustment sealed, unloading or setting of a lower response pressure possible!) |
1 |
With sealed protective cap (no adjustment/unloading possible) |
2 |
|
4 |
Pressure in the designation is to be entered by the customer, pressure adjustment ≥ 30 ... 350 bar and possible in 5 bar steps. |
z. B. 150 |
Pilot oil supply and return |
||
5 |
Internal |
– 1) |
Recommendation: Internal pilot oil supply, external pilot oil return (ordering code according to symbols) |
Y |
|
6 |
NBR seals |
no code |
FKM seals |
V |
|
Value entered at the factory |
1X |
1) Dash “–” only necessary if 12 and 13 = “no code” (see ordering code) |
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