EN 5.990.8.0/05.21
1
Proportional Pressure
Reducing Valve
spool type, direct-acting, inverse
UNF Cartridge – 80 bar
PDR08Z-02
up to 14 l/min
up to 80 bar
The proportional pressure reducing valve
PDR08Z is a spool-type direct-acting
3-way pressure control valve with inverse
function, i.e. when de-energized, the
greatest control pressure is applied (fail-
safe function).
The main function of the valve is to
maintain a constant set pressure at
consumer port 1. When de-energized,
port 2 (pump) is connected to port 1.
If the pressure at port 1 exceeds the set
nominal value, oil ows to port 3 (tank).
If the control current increases, the valve
is closed and the pressure discharged at
port 1 drops. In addition, the maximum
control pressure can be preset with
spring loading by making adjustments at
the pole tube.
As a function of the electrical control
signal the control pressure can be
continuously adjusted. Any pressure at
port 3 is additive to the pressure setting.
FEATURES
z External surfaces zinc-plated and corrosion-proof
z Very good dynamic performance
z Hardened and ground internal valve components to ensure minimal wear and
extended service life
z Coil seals protect the solenoid system
z Wide variety of connectors available
z Low pressure drop due to CFD-optimised ow path
FUNCTION
SPECIFICATIONS*
Operating pressure (p): at port 2:
max. control pressure of pressure level
Control pressure: max. 80 bar
Tank pressure (T): at port 3: max. 300 bar
Pressure levels: 12, 20, 30, 50, 80 bar
Nominal ow: max. 14 l/min P→A / max. 5 l/m A→T
Internal leakage: less than 800cm³/min
at nominal pressure 80 bar
Media operating temperature range: min. -20 °C to max. +100 °C
Ambient temperature range: min. -20 °C to max. +60 °C
Operating uid: Hydraulic oil to DIN 51524 part 1, 2 and 3
Viscosity range: min. 7 mm²/s to max. 400 mm²/s
Filtration: Permitted operating uid contamination level
according to ISO 4406 Class 19/17/14 or
better
MTTF
d
: 150 years*
Installation position: No orientation restrictions
Materials: Valve body: steel
Piston: hardened and
ground steel
Seals: NBR (standard)
FKM (optional, media
temperature range
up to +120 °C)
Back-up rings: PTFE
Solenoid coil: steel/ polyamide
Cavity: FC08-3
Weight: Valve assembly 0.33 kg
Coil only 0.19 kg
Electronics
Control currents: 1050 mA, 8.8 Ω (24 volt)
2100 mA, 2.2 Ω (12 volt)
PWM frequency: 110 - 130 Hz recommended
Hysteresis with dither: 2 - 4% at I
nom
Repeatability: ≤ 2% at I
nom
Reversal error: ≤ 2% at I
nom
Response sensitivity: ≤ 1% at I
nom
Coil type: Coil (12 or 24) PG… -40-1836
Note: In order to achieve optimal function, any trapped air should be vented using the screw
on the face of the pole tube.
* See “Conditions and Instructions for Valves” in brochure 53.000
EN 5.990.8.0/05.21
2
TYPICAL PERFORMANCE
Pressure level 20 bar / 290 psi Pressure level 80 bar / 1160 psi
Pressure level 12 bar / 170 psi Pressure level 50 bar / 720 psi
Pressure level 30 bar / 440 psi
% of primary pressure
measured at ν = 33 mm²/s,T
oil
= 46 °C, PWM = 110 Hz
% of solenoid current
Pressure loss A→T
Pressure loss A→T
Pressure loss P→A
Pressure loss P→A
0% max. control current
40% max. control current
60% max. control current
0% max. control current
50% max. control current
65% max. control current
75% max. control current
Pressure loss A→T
Pressure loss A→T
Pressure loss A→T
Pressure loss P→A
Pressure loss P→A
Pressure loss P→A
0% max. control current
0% max. control current
0% max. control current
50% max. control current
60% max. control current
45% max. control current
55% max. control current
65% max. control current
75% max. control current
70% max. control current
50% max. control current
EN 5.990.8.0/05.21
3
DIMENSIONS
CAVITY
FC08-3
Pressure setting
After loosening mounting
nut, coil can be rotated
through 360° and removed.
Hex 7/8"
Torque
25
+5
Nm
thick
millimetre (inch)
subject to technical modications
Form tools
Tool Part no.
Countersink FC08-3 175644
Reamer FC08-3 175645
Venting screw torque
2.5
+0.5
Nm
Torque
4
+1
Nm
millimetre (inch)
subject to technical modications
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: valves@hydac.com
Note
The information in this brochure relates to the
operating conditions and
applications described. For applications
not described, please contact the relevant
technical department.
Subject to technical modications.
MODEL CODE
PDR08Z-02M - C - N - 116V073 - 24 PN - 8.8
Basic model
Proportional
pressure reducing valve, 3-way
Type
02 = standard
Manual override
No details =
without manual override
M = manual override
Body and ports*
C = cartridge only
*In-line bodies on request
Sealing material
N = NBR (standard)
V = FKM
Setting range
017 = 12 bar (PSI x10 / 14.4)
029 = 20 bar (PSI x10 / 14.4)
044 = 30 bar (PSI x10 / 14.4)
072 = 50 bar (PSI x10 / 14.4)
116 = 80 bar (PSI x10 / 14.4)
Other setting ranges on request
Pressure setting
087 = 60 bar customised cracking pressure
(on request)
075 = 50 bar
Rated voltage
12 = 12 V DC
24 = 24 V DC
Other voltages on request
Coil connector 40-1836
DC: PG = DIN connector, to EN175301-803
PU = AMP Junior Timer, 2-pole, axial
PL = 2 single leads, 457mm long, 0.75 mm²
PN = Deutsch connector, 2-pole, axial, DT04-22P-EF 04
Other connector types on request
Coil resistance
2.2 = 2.2 Ω (12 V)
8.8 = 8.8 Ω (24 V)
Standard models
Code Part no.
PDR08Z-02-C-V-017V017-0 3742281
PDR08Z-02-C-V-029V029-0 3742282
PDR08Z-02-C-V-044V044-0 3580502
PDR08Z-02-C-V-072V072-0 3742283
PDR08Z-02-C-V-116V116-0 3742284
Other versions on request
*Standard in-line bodies
Code Material Connections Pressure Part no.
FH083-SB3 Steel, zinc-plated 3/8 BSP 80 bar 560922
FH083-AB3 Aluminium,
anodised
3/8 BSP 80 bar 3011427
Other connection housings on request
Seal kits
Code Material Part no.
FS UNF 08/N NBR 3651385
FS UNF 08/V FKM 3651356
VE = Visual Examination
* Allowed drilling zone (for manifold design)
** Sharp edges should be avoided by rounding
to a radius of 0.1 mm to 0.2 mm
*** largest pre-drilling diameter
(nominal tool diameter)
tting depth
tting depth
EN 5.990.8.0/05.21
4