E 5.991.4.0/12.10
530
Proportional Pressure Relief
Valve – 350 bar
PDB10PZ
SPOOL Type – Pilot Operated – Inverse
Cartridge Valve
120 l/min
350 bar
The PDB10PZ is a two stage spool type
proportional pressure relief valve. If the
pressure at port 1 rises above the setting
dened 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 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
maximal pressure can be pre-adjusted
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: 120 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/ 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 FC10-2
Weight: complete valve: 0.50 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 optimal function, any trapped air should be vented using the bleed
scew on the face of the tube.