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Pressure Relief Valve
Poppet Type, Pilot-Operated
Metric Cartridge – 350 bar
DB10120A
Up to 100 l/min
Up to 350 bar
The pressure relief valve DB10120A is a
pilot-operated, spring-loaded poppet valve.
Its function is to relieve pressure in the
system. It is normally closed. If the pressure
at port 1 exceeds the pre-set spring tension,
the pilot stage opens and oil ows from
behind the main piston to tank port 2. The
resulting pressure differential causes the
main piston to move against the return spring
and allows oil to ow from port 1 to port 2.
This continues until the system pressure is
equal to the spring tension and the valve
closes again.
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 Excellent stability throughout the entire ow range
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 Low pressure drop by CFD optimized ow path
z Various pressure ranges up to 350 bar
FUNCTION
SPECIFICATIONS
Operating pressure: min. 5 to max. 350 bar
max. 100 bar at port 2 (tank)
Nominal ow: max. 100 l/min
Pressure setting ranges: 5 to 100 bar
5 to 250 bar
5 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: 10120A
Weight: 0.13 kg
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MODEL CODE
DB 10120A – 02 X – 250 V 210
Basic model
Pressure relief valve
Cavity to ISO
10120A = 2-way, metric
Type
02 = standard, zinc-plated
Series
(determined by manufacturer)
Pressure setting range
100 = 5 to 100 bar
250 = 5 to 250 bar
350 = 5 to 350 bar
Other pressure ranges on request
Type of adjustment
V = Allen head
P = can be lead-sealed, adjustable with tool
Other types of adjustment on request
Opening pressure setting
No details.= no setting, spring relaxed
210 = opening pressure in bar, factory-set
Other pressure settings on request
(Pre-set versions are factory-set at a ow rate of 6 l/min)
Standard models
Model code Part No.
DB10120A-02X-100V 561040
DB10120A-02X-250V 561041
DB10120A-02X-350V 561076
Other models on request
Standard in-line bodies
Code Part No. Material Ports Pressure
R10120A-01X-01 395232 Steel, zinc-plated G1/2 420 bar
R10120A-01X-02 395233 Steel, zinc-plated M 22 x 1.5 420 bar
Other line bodies on request
Seal kits
Code Material Part No.
SEAL KIT DB10120A NBR 3085499
SEAL KIT DB10120A FKM 560222
PERFORMANCE
Measured at ν= 36 mm²/s, T
oil
= 50 °C
350 V
Flow rate [l/min]
Pressure drop [bar]
Flow rate [l/min]
Pressure drop [bar]
250 V
100 V
Flow rate [l/min]
Pressure drop [bar]
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DIMENSIONS
CAVITY
10120A
SW 27
torque 25
+5
Nm
int. hex.
SW 2.5
SW 8
Millimeter
Subject to technical modications
Form tools
Tool Part No.
Countersink HE25 166284
Reamer MK2 166285
Tap 1002627
Plug gauge 166286
HYDAC Fluidtechnik 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.
Millimeter
Subject to technical modications
tting depth
max.
thru
thick
max.
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