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Description
- Size 32, 40
- Component series 1X
- Maximum operating pressure 350 bar
- Maximum flow 650 l/min
Features
- Zero-pressure start-up and circulation of the pump
- For direct mounting to the SAE pressure port of the pump
- Quick pressure build-up
- Solenoid-actuated unloading via a built-on directional valve
- Integrated check valve, optional
- Switching shock damping, optional
- CE conformity according to the Low-Voltage Directive 2014/35/EU for electrical voltages >50 VAC or >75VDC
- Solenoid coil as approved component with UR marking according to UL 906, edition 1982, optional
Product description
Pump safety blocks of types DBA/DBAW 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 (DBA) or limiting and magnetically unloading (DBAW) the operating pressure.
Pump safety blocks (DBA) 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.
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.
Pump safety block type DBAW
In addition, it can be switched from the pressure limiting function to depressurized circulation by controlling the built-on directional valve (15). Thus, a depressurized start-up of the pump is possible.
Pump safety block with switching shock damping (sandwich plate)
Version "S6E…R12" and "S6SM…B12"
The opening of the connection from B2 to B1 or P2 to P1 is delayed by means of the switching shock damping valve (16). Pressure peaks and acoustic decompression shocks in the return line can thus be avoided. It is installed between the pilot control valve (2) and the directional valve (15).
The degree of damping (decompression shock) is determined by the size of the nozzle (17). By default, a nozzle Ø1,2 mm is installed (ordering code "..R12.." or "..B12..").
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | |
| DBA | N | 1X | / | K4 |
| 01 | Pump safety block | DBA |
| 02 | Without directional valve | no code ◇ |
| With attached directional valve | W | |
| 03 | Without check valve | no code ◇ |
| With check valve | R 1) | |
| 04 | Size 32 | 30 ◇ |
| Size 40 | 40 ◇ | |
| 05 | Normally closed | A 2) |
| Normally open | B 2) ◇ | |
| Connection / SAE flange 3) | ||
| 06 | Standard flange (200 … 250 bar) | F |
| High-pressure flange (315 … 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 4) | |
| Rotary knob with scale | 7 | |
| 08 | With main spool Ø28 mm | N |
| 09 | Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) | 1X |
| Pressure rating | ||
| 10 | Set pressure up to 50 bar | 50 |
| Set pressure up to 100 bar | 100 ◇ | |
| Set pressure up to 200 bar | 200 ◇ | |
| Set pressure up to 250 bar (only NG32 and standard flange "F") | 250 | |
| Set pressure up to 315 bar (only version "H") | 315 ◇ | |
| Set pressure up to 350 bar (only version "H") | 350 ◇ | |
| Pilot flow | ||
| 11 | Pilot oil supply and pilot oil return internal (standard) | – 5) ◇ |
| 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 ◇ |
| With switching shock damping (only version "W") | S | |
| 14 | Without directional valve | no code ◇ |
| With directional spool valve (data sheet 23178) | 6E 2) ◇ | |
| With directional seat valve (data sheet 22058) | 6SM 2) | |
| 15 | Direct voltage 24 V | G24 2) ◇ |
| Direct voltage 205 V | G205 2) | |
| Alternating voltage 230 V 50/60 Hz (version "6E" only) | W230 2) | |
| 16 | Without manual override | no code |
| With manual override (version "6E“ only) | N 2) | |
| With concealed manual override (standard) | N9 2) ◇ | |
| Electrical connection | ||
| 17 | Without mating connector, with connector DIN EN 175301-803 | K4 2;6) |
| 18 | Nozzle Ø1.2 mm in channel B of the directional spool valve | R12 7) |
| Nozzle Ø1.2 mm in channel P of the directional seat valve | B12 7) | |
| Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data") | ||
| 19 | NBR seals | no code ◇ |
| FKM seals | V | |
| Type-examination procedure | ||
| 20 | Without type-examination procedure | no code ◇ |
| Type-examination tested safety valve according to Pressure Equipment Directive 2014/68/EU | E | |
| 21 | Standard version | no code ◇ |
| Solenoid coil is an approved component with UR-marking according to UL 906 | =UR | |
| 1) | Only up to pressure rating 315 bar |
| 2) | Ordering code only necessary with version with mounted directional valve "W". |
| 3) | Please observe pressure ratings and connection dimensions. |
| 4) | H-Key with material no. R900008158 is included in the scope of delivery. |
| 5) | Dash "–" only necessary with version with attached directional valve "W" and 12 and 13 = "no code" |
| 6) | Mating connectors, separate order, see "Accessories" |
| 7) | Ordering code only necessary with version with mounted directional valve "W" and 13 = "S" |
Notice:
◊ = Preferred type
Type-examination tested safety valves, version "E"
(Component series 1X, according to the Pressure Equipment Directive 2014/68/EU)
| Size | Type designation | Component marking | Maximum flow qVmax in l/min with pilot oil return | Set response overpressure p in bar | |
| external "Y" | internal "–" | ||||
| 32 |  | TÜV.SV.▢–1150.22.F.G.p | 200 | 175 | 30 ... 60 |
 | 400 | 260 | 61 ... 110 | ||
 | 600 | 360 | 111 ... 210 | ||
 | 700 | 520 | 211 ... 350 | ||
| 40 |  | TÜV.SV.▢–1150.22.F.G.p | 350 | 300 | 30 ... 60 |
 | 450 | 350 | 61 ... 110 | ||
 | 550 | 500 | 111 ... 210 | ||
 | 700 | 600 | 211 ... 350 | ||
| 1) | Only version "315" |
| 1 | Directional valve, normally closed | A |
| Directional valve, normally open | B | |
| 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 bar and possible in 5 bar steps. | z. B. 150 |
| Pilot oil flow | ||
| 5 | Internal | – 1) |
| Recommendation: Internal pilot oil supply, external pilot oil return (ordering code according to symbols) | Y | |
| * | Ordering code of the electric data | z. B. EG24N9K4 |
| 6 | NBR seals | no code |
| FKM seals | V | |
| ▢ | Value entered at the factory | |
| 1) | Dash "–" only necessary with version with attached directional valve "W" and 12 and 13 = "no code" |
Technical data
general
| Type | DBA | DBAW | DBA | DBAW | ||
| Size | 32 | 40 | ||||
| Weight | Standard | kg | 8 | 9.2 | 11.4 | 12.6 |
| Check valve "R" | kg | 0.3 | 0.4 | |||
| Switching shock damping "S" | kg | 0.6 | ||||
| Installation position | any | |||||
| Ambient temperature range | NBR seals | °C | -20 … +80 | -20 … +50 | -20 … +80 | -20 … +50 |
| FKM seals | °C | -15 … +80 | -15 … +50 | -15 … +80 | -15 … +50 | |
| Conformity | CE according to Low-Voltage Directive 2014/35/EU tested according to | EN 60204-1:2006-01 and DIN VDE 0580, classified as component. | ||||
hydraulic
| Type | DBA | DBAW | DBA | DBAW | |||
| Size | 32 | 40 | |||||
| Maximum operating pressure | Port P | bar | 350 | ||||
| Port T | bar | 315 | |||||
| Cracking pressure | Version “R” | bar | 0.5 | ||||
| Maximum counter pressure | Port Y | bar | 315 - | - - | 315 - | - - | |
| Port Y, T | DC solenoid | bar | - | 210 | - | 210 | |
| AC solenoid | bar | - | 160 | - | 160 | ||
| DC solenoid with version "=UR" | bar | - | 180 | - | 180 | ||
| Maximum set pressure | bar | 50 100 200 250 315 350 | 50 100 200 315 350 | ||||
| Minimum set pressure | flow-dependent, see "characteristic curves" | ||||||
| Maximum flow | Standard | l/min | 600 | 650 | |||
| Version “R” | l/min | 350 | 450 | ||||
| Hydraulic fluid | see table "Hydraulic fluid" | ||||||
| Hydraulic fluid temperature range (at the valve working ports) | NBR seals | °C | -20 … +80 | ||||
| FKM seals | °C | -15 … +80 | |||||
| Viscosity range | mm²/s | 10 … 800 | |||||
| Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 1) | Class 20/18/15 | ||||||
| 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. |
Notices:
- Technical data for directional seat valves see data sheet 22058, directional spool valves data sheet 23178.
- Deviating technical data for type-examination tested safety valves see below.
| Hydraulic fluid | Classification | Suitable sealing materials | Standards | Data sheet | |
| Mineral oils | HL, HLP, HLPD, HVLP, HVLPD | NBR, FKM | DIN 51524 | 90220 | |
| Bio-degradable | Insoluble in water | HETG | FKM | ISO 15380 | 90221 |
| HEES | FKM | ||||
| Soluble in water | HEPG | FKM | ISO 15380 | ||
| Flame-resistant | Water-free | HFDU (glycol base) | FKM | ISO 12922 | 90222 |
| HFDU (ester base) | FKM | ||||
| HFDR | FKM | ||||
| Containing water | HFC (Fuchs: Hydrotherm 46M, Renosafe 500; | NBR | ISO 12922 | 90223 | |
| Important information on hydraulic fluids:
| |||||
Deviating technical data : Type-examination tested safety valves, version "E"
(Component series 1X, according to the Pressure Equipment Directive 2014/68/EU)
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 (= "TS") | °C | -10 … +60 | |
| Viscosity range | mm²/s | 12 … 230 | |
(For applications outside these values, please consult us!)
Diagrams/characteristic curves
(measured with HLP46, ϑOil = 40 ±5 °C)
Minimum set pressure and circulation pressure dependent on the flow
Standard version
Minimum set pressure and circulation pressure dependent on the flow
Version “U”
Inlet pressure dependent on the flow
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.
- The characteristic curves apply to an output pressure pT =0 bar in the entire flow range.
Type-examination tested safety valves, version "E"
(Component series 1X, according to the Pressure Equipment Directive 2014/68/EU)
Maximum counter pressure in the discharge line
Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the flow qVmax for valves type DBA...E with different response pressures pA. Intermediate values may be determined by means of interpolation. Regarding the procedure for interpolation refer to "Interpolation of intermediate values from the diagram".
Size 30
Size 40
| Characteristic curves | Response pressurepA in bar |
| 1 | 50 |
| 2 | 110 |
| 3 | 115 |
| 4 | 210 |
| 5 | 215 |
| 6 | 315 |
| pA | Response pressure in bar |
| pT | Maximum counter pressure in the discharge line (port T) in bar (sum of all possible counter pressures; also see AD2000 data sheet - A2) |
| pTmax | 10 % x pA (with qV = 0 l/min) |
| qVmax | Maximum flow in l/min |
Determination of the maximum counter pressure
- Flow of the system / accumulator to be secured : qVmax = 320 l/min
- Safety valve set to : pA = 350 bar
- Read off the maximum counter pressure pT of approx. 16,2 bar from the diagram (see arrows, characteristic curve 8).
Symbols/Circuit diagrams
Version "DBA"
| "DBA…–" | "DBA…Y" | "DBAR…–" | "DBAR…Y" |
 |  |  |  |
Version "DBAW"
| "DBAW…–" | "DBAW…Y" | |
| Normally closed |  |  |
| Normally open |  |  |
| "DBAWR…–" | "DBAWR…–Y" | |
| Normally closed |  |  |
| Normally open |  |  |
Version "DBAW…S"
| "DBAW…S6E…R12" | "DBAW…S65M…B12" |
 |  |
Dimensions
load errorInformation
General information
- The unloading function (directional valve function with version "W") must not be used for safety functions.
- 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 by spring preload 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
Safety Instructions
load errorDownloads
 | Pump safety block Manual | RE25880-B | 2021-10-01 | English | PDF | 1.4MB Product Groups: Industrial Hydraulics Type DBA...1X/...E |
| Pump safety block Data Sheet | RE25880 | 2021-10-01 | English, United States | PDF | 929k Product Groups: Pressure relief valves Type DBA; DBAW, Sizes 32 and 40 |
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