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Pressure Relief Valve
Poppet Type, Direct-Acting
Metric Cartridge – 350 bar
DB3E
Up to 15 l/min
Up to 350 bar
The pressure relief valve DB3E is a direct-
acting, spring-loaded poppet valve. Its
function is to relieve pressure in the system.
The spring exerts a force on the poppet and
presses it on the valve seat. On the opposite
side, the system pressure exerts force on
port 1 of the valve. If the hydraulic pressure
is below the pre-set spring tension, the valve
is closed. Only if the hydraulic force exceeds
the pre-set spring tension does the valve
open and ow is diverted to tank via port 2.
Important: Pressures at port 2 are additive to
the opening pressure!
If the connections are incorrect or if the
pressure has been set above the operating
pressure, the safety function of the valve is
disabled.
FEATURES
z Low hysteresis and accurate pressure control
z External surfaces zinc-plated and corrosion-proof
z Hardened and ground internal valve components to ensure minimal wear and
extended service life
z Adjustable throughout ow range
z Various pressure ranges up to 350 bar
z Guided poppet
FUNCTION
SPECIFICATIONS
Operating pressure: max. 350 bar
max. 100 bar at port 2 (tank)
Nominal ow: 15 l/min
Operating pressure ranges: 5 to 50 bar
10 to 100 bar
10 to 250 bar
20 to 350 bar
Leakage: leakage-free
Media operating temperature range: min. -20 °C to max. +120 °C
Ambient temperature range: min. -20 °C to max. +120 °C
Operating uid: Hydraulic oil to DIN 51524 Part 1 and 2
Viscosity range: min. 7.4 mm²/s to max. 420 mm²/s
Filtration: Class 21/19/16 according to ISO 4406 or
cleaner
MTTF
d
150 years (see "Conditions and
instructions for valves" in brochure 5.300)
Installation: No orientation restrictions
Materials: Valve body: high tensile steel
Piston: Hardened and ground
steel
Seals: FKM (standard)
NBR (optional, media
temperature range
-30 °C to +100 °C)
Back-up rings: PTFE
Cavity: 05220
Weight: 0.053 kg
Adjustment
device
Valve body
Spring
Poppet
Valve seat
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Standard models
Model code Part No.
DB3E-02X-50V 716125
DB3E-02X-100V 716147
DB3E-02X-250V 716146
DB3E-02X-350V 397405
Other models on request
Standard in-line bodies
Code Part No. Material Ports Pressure
R05220-01X-01 277372 Steel, zinc-plated G3/8 420 bar
Other line bodies on request
Seal kits
Code Part No.
SEAL KIT DB3E...FKM 715797
PERFORMANCE
Pressure range ... 50 bar
Q in l/min
Inlet pressure p [bar]
Pressure range ... 100 bar
Q in l/min
Inlet pressure p [bar]
Pressure range ... 250 bar
Q in l/min
Inlet pressure p [bar]
operating limit
MODEL CODE
DB3E – 02 X – 350 V 250
Basic model
Pressure relief valve, metric
Type
02 = standard
Series
(determined by manufacturer)
Pressure setting range
30 = up to 30 bar
100 = up to 100 bar
250 = up to 250 bar
350 = up to 350 bar
Other pressure ranges on request
Type of adjustment
V = Allen head (standard)
F = xed setting, cannot be adjusted
P = can be lead-sealed, adjustable with tool
Other types of adjustment on request
Opening pressure setting
No details.= no setting, spring relaxed
250 = opening pressure in bar pre-set by manufacturer
Setting on request
Pressure range ... 350 bar
Inlet pressure p [bar]
Q in l/min
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Millimeter
Subject to technical modications
CAVITY
05220
Millimeter
Subject to technical modications
Form tools
Tool Part No.
Countersink 170040
Reamer 1014203
Tap 1002605
Plug gauge 172827
torque 25
+5
Nm
DIMENSIONS
Type of adjustment
HYDACFluidtechnik GmbH
Justus-von-Liebig-Str.
D-66280 Sulzbach/Saar
Tel: 0 68 97 /509-01
Fax: 0 68 97 /509-598
E-Mail: utec@hydac.com
NOTE
The information in this brochure relates to the
operating conditions and applications described.
For applications or operating conditions not
described, please contact the relevant technical
department.
Subject to technical modications.
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