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518
Proportional Pressure Relief Valve
SAE 8-Cartridge – 350 bar
PDB08P-01
Spool Type – Pilot Operated
60 l/min
350 bar
The PDB08P 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 changed steplessly.
Features
z All surfaces zinc-plated and corrosion proof
z All valve parts made of high-strength steel with hardened and ground
components to ensure minimal wear and to extend service life
z Rigid design using one-piece body minimizes the effect of eccentricity and
maximizes reliability
z Waterproof design standard
z Wide variety of connectors available
z Excellent stability throughout ow range
z Excellent dynamic performance
z Low pressure drop by CFD optimized ow-path
z Screen protected measuring orice enhances safety
FuNctION
specIFIcatIONs
Operating pressure: max. 350 bar
Nominal ow: max. 60 l/min
Operating pressure ranges: up to 60 bar, up to 230 bar, up to 350 bar
Control current range: 1050 mA, 8.8 Ω / 2100 mA, 2.2 Ω
Internal leakage: less than 0.5 l/min at 350 bar
Media operating temp. range: -20 °C to +120 °C
Ambient temp. range: -20 °C to +60 °C
Dither frequency: 180 Hz - 250 Hz
Response time: On: approx. 50 ms, Off: approx. 30 ms
Hysteresis with dither: 2 - 4 % of maximum control current
Repeatability: 1.5 % of maximum pressure range
Reversal error: ≤ 2 % of maximum control current
Response sensitivity: ≤ 1 % of maximum control current
Fluids: Mineral-based or synthetics with
lubricating properties
Viscosity: 7.4 to 420 mm²/s
Filtration: Class 18/16/13 up to 19/17/14 according
to ISO 4406 or cleaner
Installation: no orientation restrictions
Material: Valve body: carbon steel
Spool: carbon steel
Seals: NBR (standard)
FKM (optional)
Coil: Steel / Polyamide
Notes:
The PDB08P can also be supplied with an emergency pressure adjustment (version
-01M). This allows a mechanical pressure adjustment of the valve if the electrical signal
is interrupted. This adjustment should be used only in the case of electrical failure since
the manual setting would be additive to the electrical setting and the danger of equipment
damage could develop.
In order to achieve optimal function, any trapped air should be vented with the bleed
screw on the face of the tube (not tted to version -01M).
Cavity: FC08-2
Weights: Valve complete: 430 g
Coil only: 230 g
E 5.991.1.0/12.10
519
perFOrmaNce
mOdel cOde
PDB08P–01M-C-N-330-24PG-8.8
Basicmodel
Option
Omission = No option
M = Emergency pressure adjustment
BodyandPorts*
C = Cartridge only
SB3 = 3/8 BSP ports, steel body
SS6 = SAE-6 ports, steel body
AB3 = 3/8 BSP ports, aluminium body
AS6 = SAE-6 ports, aluminium body
Seals
N = NBR
V = FKM
Pressurerange
87 = up to 60 bar
330 = up to 230 bar
500 = up to 350 bar
Coilvoltage
12 = 12 V (2.2 Ω)
24 = 24 V (8.8 Ω)
Coilconnector
PG = DIN connector (DIN 43650)
PL = Leadwires (2) – 457 mm (18") long
PN = Deutsch Connector DT04-2P-EP04 (axial)
PU = AMP Junior Timer, 2 pole, axial
Coilresistance
2.2 = 2.2 Ω (12 V)
8.8 = 8.8 Ω (24 V)
dImeNsIONs
caVItY
FC08-2
% of Max. Relieving Pressure
measured at ν = 34 mm²/s, T
oil
= 46 °C
Emergency pressure
adjustment
Torque 10-11 Nm
After loosening knurled nut,
coil can be rotated through
360 ° and removed.
Flow rate
Relieving Pressure
% of Max. Control Current
7/8'' Hex
Torque 25-30 Nm
thick
75 % Max. control current
50 % Max. control current
No control current
HYDACFluidtechnikGmbH
Justus-von-Liebig-Str.
D-66280Sulzbach/Saar
Tel: 0 68 97 /509-01
Telefax. 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
*StandardLineBodies
Code PartNo Material Ports Pressure
FH082-SB3 560919 Steel, zinc-plated 3/8 BSP 420 bar
FH082-SS6 560917 Steel, zinc-plated SAE-6 420 bar
FH082-AB3 3011423 Aluminium, clear anodized 3/8 BSP 245 bar
FH082-AS6 3011409 Aluminium, clear anodized SAE-6 245 bar
Standardmodels
Modelcode Materialno.
PDB08P-01-C-N-87-12PG-2.2 3144426
PDB08P-01-C-N-330-12PG-2.2 3144427
PDB08P-01-C-N-500-12PG-2.2 3144458
PDB08P-01-C-N-87-24PG-8.8 3144459
PDB08P-01-C-N-330-24PG-8.8 3144460
PDB08P-01-C-N-500-24PG-8.8 3144461
Venting Screw
Torque 0.9-1 Nm
(without emergency
pressure adjustment)
''
(without emergency
pressure adjustment)
Torque 4-6 Nm
100 % Max. control current
measured at ν = 34 mm²/s, T
oil
= 46 °C