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Pressure Relief Valve
Poppet Type, Direct-Acting
Metric Cartridge – 420 bar
DB12120A
Up to 120 l/min
Up to 420 bar
The pressure relief valve DB12120A is a
direct-acting, 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
poppet is lifted off the seat and oil ows 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 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 420 bar
FUNCTION
SPECIFICATIONS
Operating pressure: max. 420 bar
max. 100 bar at port 2 (tank)
Nominal ow: max. 120 l/min
Pressure setting ranges: 5 to 30 bar
30 to 55 bar
55 to 90 bar
10 to 150 bar
10 to 250 bar
10 to 350 bar
10 to 420 bar
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: Piston: hardened and
ground steel
Seals: FKM (standard)
NBR (optional, media
temperature range
-30 °C to +100 °C)
Back-up rings: PTFE
Cavity: 12120A
Weight: 0.42 kg
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MODEL CODE
DB 12120A – 01 X – 250 V 210
Basic model
Pressure relief valve
Cavity to ISO
12120A = 2-way, metric
Type
01 = standard, zinc-plated
Series
(determined by manufacturer)
Pressure setting range
30 = 5 to 30 bar
55 = 30 to 55 bar
90 = 55 to 90 bar
150 = 10 to 150 bar
250 = 10 to 250 bar
350 = 10 to 350 bar
420 = 10 to 420 bar
Other pressure ranges on request
Type of adjustment
V = Allen head
P = can be lead-sealed, adjustable with tool (with plug)
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
Standard models
Model code Part No.
DB12120A-01X-030V 555785
DB12120A-01X-055V 3117096
DB12120A-01X-090V 3494786
DB12120A-01X-150V 552805
DB12120A-01X-250V 552806
DB12120A-01X-350V 552807
DB12120A-01X-420V 552836
Standard in-line bodies
Code Part No. Material Ports Pressure
R12120A-01X-01 396489 Steel, zinc-plated G 3/4 420 bar
Other line bodies on request
Seal kits
Code Material Part No.
SEAL KIT DB12120A-01X-...V FKM 557399
DIMENSIONS
CAVITY
12120A
hex. SW 32
torque 50
+10
Nm
int. hex.
SW 5
SW
16
Millimeter
Subject to technical modications
Form tools
Tool Part No.
Countersink MK3 173958
Reamer MK2 174874
Tap 1002625
Millimeter
Subject to technical modications
tting depth
Adjustmt type F Adjustmt type V Adjustmt type PP
max. max.
max.
max.
max.
thru
thick
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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 modications.
PERFORMANCE
Pressure range ... 150 bar
Flow rate [l/min]
Inlet pressure [bar]
0102030405060708090100 110 120
0
5
10
15
20
25
30
35
40
45
50
Pressure range ... 30 bar
Flow rate [l/min]
Pressure [bar]
Pressure range ... 350 bar
Flow rate [l/min]
Inlet pressure [bar]
Pressure range ... 90 bar
Flow rate [l/min]
Pressure [bar]
0102030405060708090100 110 120
0
10
20
30
40
50
60
70
80
90
100
Flow rate [l/min]
Inlet pressure [bar]
Pressure range ... 420 bar
Flow rate [l/min]
Inlet pressure [bar]
Pressure range ... 250 bar
Flow rate [l/min]
Pressure [bar]
0102030405060708090 100 110120
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
Pressure range ... 55 bar
Measured at ν = 33 mm²/s, T
oil
= 46 °C
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