E 5.991.5.0/12.10
528
Proportional Pressure
Relief Valve – 350 bar
PDB08PZ
SPOOL Type – Pilot Operated – Inverse
Cartridge Valve
60 l/min
350 bar
The PDB08PZ 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 port 2. As a function of the
electrical signal, the relief pressure at
port 1 can be smoothly adjusted.
The valve is inversely controlled:
the lowest pressure is created with 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 maximum pressure can be pre-set
mechanically.
Features
Preventive against cavitation
All surfaces zinc-plated and corrosion-proof.
Small hysteresis and good stability over 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
Pressure ranges: 4 to 60, 230, 350 bar
Nominal ow: 60 l/min
Internal leakage: less than 0.5 l/min at 80% of
nominal pressure
Media operating temp. range: min. -20 °C to max. +120 °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 FC08-2
Weight: complete valve: 0.43 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: 160 - 250 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 optimal function, any trapped air should be vented using the bleed
screw on the face of the tube.
E 5.991.5.0/12.10
529
perFOrmaNce
mOdel cOde
PDB08PZ-08-C-N-330-V-330-24PG-8.8
Basicmodel
Proportional pressure relief inverse
Type
08 = Standard
BodyandPorts
C = Cartridge only
Seals
N = NBR
V = FKM
Pressurerange
087 = 4 - 60 bar (870 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)
330 = specic opening 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)
dImeNsIONs
caVItY
FC08-2
Relieving Pressure
measured at ν = 34mm
2
/s, T
oil
= 46 °C
Pressure
adjustment SW 6
After loosening knurled nut,
coil can be rotated through
360 ° and removed.
Flow rate
Relieving Pressure
7/8'' Hex
Torque 25+5 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
millimeter (inch)
subject to technical modications
Formtools
Tool PartNo.
Rougher FC08-2 175473
Finisher FC08-2 175474
millimeter (inch)
subject to technical modications
Inlineconnectionhousings
Code PartNo. Material Ports Pressure
FH082-SB3 560919 Steel, zinc plated 3/8 BSP 420 bar
FH082-AB3 3011423 Alu, anodized 3/8 BSP 245 bar
Standardmodels
Modelcode PartNo.
PDB08PZ-08-C-N-087V087-12PG-2.2 3356340
PDB08PZ-08-C-N-087V087-24PG-8.8 3356404
PDB08PZ-08-C-N-330V330-12PG-2.2 3356342
PDB08PZ-08-C-N-330V330-24PG-8.8 3356435
PDB08PZ-08-C-N-500V500-12PG-2.2 3356344
PDB08PZ-08-C-N-500V500-24PG-8.8 3356438
Venting Screw
Torque 2.5+0.5 Nm
''
Torque 4+2Nm
1/2" HEX
Torque 8+2 Nm
other models on request
0 10 20 30 40 50 60 70 80 90 100
0.0
25.0
50.0
75.0
100.0
125.0
measured at ν = 34 mm
2
/s, T
oil
= 46 °C
% of Maximum Control Current
70 % Max. control current
50 % Max. control current
No control current
100 % Max. control current
0 10 20 30 40 50 60
l/min
0.0
5.0
10.0
15.0
20.0
25.0
0
50
100
150
200
250
300
350
0 5 10 15
US gpm
0 10 20 30 40 50 60
l/min
0.0
50.0
100.0
150.0
200.0
250.0
300.0
0
1000
2000
3000
4000
0 2 4 6 8 10 12 14
US gpm
measured at ν = 34 mm
2
/s, T
oil
= 46 °C
Relieving Pressure
Flow rate