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Proportional Pressure Relief
Valve – 350 bar
PDB12PZ-08/-09
SPOOL Type – Pilot Operated – Inverse
Cartridge Valve
200 l/min
350 bar
The PDB12PZ is a two stage spool type
proportional pressure relief valve. If the
pressure at port 1 rises above the setting
dened by the electrical control signal,
the pilot stage opens and allows ow
from the back of the main piston to port 2.
The resulting pressure imbalance causes
the main piston to open against the return
spring and allows ow from port 1 to 2.
As a function of the electrical signal, the
relief pressure at port 1 can be changed
steplessly.
The valve is inversely controlled: the
lowest pressure is created at the highest
current. With decreasing control current
the pilot-stage closes, the main stage
follows the pilot-stage and at port 1
a counter pressure is created, e.g. to
accelerate the motor of a fan.
The max. pressure can be pre-set
mechanically.
Features
Patented design to prevent erosion at cavitation
All surfaces zinc-plated and corrosion-proof
Small hysteresis and good stability across the whole pressure and ow range
Excellent dynamic performance
All valve parts made of high-strength steel with hardened and ground
components to ensure minimal wear and extended service life
Coil seals protect the solenoid system
Rigid design using one-piece body minimizes the effect of eccentricities in cavity
and maximizes reliability
Low pressure drop by CFD optimized ow-path
Adjustable over the entire pressure range
FuNctION
specIFIcatIONs
Operating pressure: max. 350 bar port 1 / 50 bar port 2
Nominal ow: 200 l/min
Internal leakage: less than 0.5 l/min at 80% of
nominal pressure
Media operating temp. range: min. -20 °C to max. +100 °C
Ambient temp. range: min. -20 °C to max. +60 °C
Operating uid: hydraulic oil according to DIN 51524 part 1 and 2
Viscosity: min. 7.4 mm²/s to max. 420 mm²/s
Filtration: Class 18/16/13 up to 19/17/14 according to
ISO 4406 or cleaner
Installation: optional
Material: valve body: carbon steel
piston: hardened and ground
steel
seals: NBR (Standard)
FKM (Optional)
back-up rings: PTFE
Cavity: UNF FC12-2
Weight: complete valve: 0.58 kg
only coil: 0.22 kg
Control current range: 1050 mA, 8.8 Ohm (24 Volt)
2100 mA, 2.2 Ohm (12 Volt)
PWM frequency: 200 Hz
Hysteresis with dither: 2-4% of max. control current
Repeatability: ≤ 2% of max. pressure range
Reversal error: ≤ 2% of max. control current
Response sensitivity: ≤ 1% of max. control current
NOTE
In order to achieve optimum function, any trapped air should be vented using the bleed
screw on the face of the tube.
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perFOrmaNce
mOdel cOde
PDB12PZ-08-C-N-330-V-330-24PG-8.8
Basicmodel
Proportional pressure relief inverse
Type
08 = higher basic ∆p improved
opening and closing behaviour
(pressure range 330 - 500)
09 = lower basic ∆p,
main application= fan control
(pressure ranges 087 - 330)
BodyandPorts
C = Cartridge only
Seals
N = NBR
V = FKM
Pressurerange
087 = 4 - 60 bar (870 PSI)
140 = 4 - 96 bar (1400 PSI)
330 = 4 - 228 bar (3300 PSI)
500 = 4 - 345 bar (5000 PSI)
Adjustmentoption
V = adjustable by tool
Pressuresetting
omission = no adjustment (spring released)
value = factory preset relief pressure (value PSI/10)
Coilvoltage
12 = 12 V (2.2 Ω)
24 = 24 V (8.8 Ω)
Coilconnector
PG = DIN Connector to EN175301-803
PL = 2 ying leads 0.75mm²
PN = Deutsch Connector, 2 pole
PT = AMP Junior Timer, 2 pole, radial
Coilresistance
2.2 = 2.2 Ω (12 V)
8.8 = 8.8 Ω (24 V)
Inlineconnectionhousings
Code PartNo. Material Ports Pressure
FH122-SB6 3053782 Steel, zinc plated 3/4 BSP 420 bar
FH122-AB6 3053843 Alu, anodized 3/4 BSP 245 bar
Standardmodels
Modelcode PartNo.
PDB12PZ-09-C-N-087V087-12PG-2.2 3370981
PDB12PZ-09-C-N-087V087-24PG-8.8 3370980
PDB12PZ-08-C-N-330V330-12PG-2.2 3370977
PDB12PZ-08-C-N-330V330-24PG-8.8 3370978
PDB12PZ-08-C-N-500V500-12PG-2.2 3370953
PDB12PZ-08-C-N-500V500-24PG-8.8 3370976
other models on request
Relieving Pressure
measured at ν = 34 mm
2
/s, T
oil
= 46 °C, 100 % max. current
Flow rate
∆p-Q graph
Relieving Pressure %
measured at ν = 34 mm
2
/s, T
oil
= 46 °C
% of Maximum Control Current
P-I graph
70 % Max. control current
50 % Max. control current
No control current
100 % Max. control current
measured at ν = 34 mm
2
/s, T
oil
= 46 °C
Relieving Pressure
Flow rate
P-Q graph, typical
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caVItY
FC12-2
Formtools
Tool PartNo.
Rougher FC12-2 176951
Finisher FC12-2 176952
millimeter (inch)
subject to technical modications
dImeNsIONs
Pressure
adjustment SW 6
After loosening knurled
nut, coil can be rotated
through 360 ° and
removed.
1 1/4'' Hex
Torque 50
+10
Nm
millimeter (inch)
subject to technical modications
Venting Screw
Torque 2.5
+0.5
Nm
''
Torque 4
+2
Nm
1/2" HEX
Torque 8
+2
Nm
thick
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
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.
NOTE
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