Proportional 3-Way Pressure-Reducing Cart., Size 2…5
Q
max
= 15l/min,p
max
= 100bar
Direct acting, electrically operated
Series DDRRZ-7011… to 7055…
1/6
Reference: 400-P-590101-EN-02
Issue: 09.2023
S Compact push-in cartridge construction
for cavity type AG
S Operated by a proportional solenoid
S Model for p
max
100 bar inlet pressure
S 5 pressure ranges available
S Excellent stability over the whole pressure
and flow range
S All exposed parts with zinc-nickel plating
S High pressure wet-armature solenoids
S Various plug-connector systems and voltages
are available
S Can be fitted in a line-mounting body
1 Description
Series DDRRZ-70… proportional 3-way pressure-reducing
cartridges are direct acting, spool-type, push-in cartridges
and are available in sizes 2...5. They reduce the outlet pres
sure in A as a function of the control current signal and inde
pendently of the inlet pressure in P. In the initial position
(solenoid de-energised) the inlet of the 3-way pressure-re
ducing cartridge is shut off and the outlet is connected to
tank (port A → T). In control mode, the connection P → A
opens until the pressure in port A reaches the preset level.
If the pressure rises above the preset level, the control spool
opens the A → T connection until balance is attained. Five
pressure ranges are available. To accommodate a maxi
mum operating pressure (inlet pressure) of p
max
100 bar,
the “H” model must be used. With other models the maxi
mum operating pressure is dependent on the pressure
range. These 3-way pressure-reducing cartridges are pre
dominantly used for reducing a system pressure in mobile
and industrial applications. They are suitable for controlling
larger directional valves, where they can be incorporated in
the valve body or directly in the end covers, for example,
and for controlling pumps and motors. All external parts of
the cartridge are zinc-nickel plated according to DIN EN ISO
19 598 and are thus suitable for use in the harshest operat
ing environments. For self-assembly, please refer to the
section related data sheets.
2 Symbol
A
P
T
3 Technical data
General characteristics Description, value, unit
Designation proportional 3-way pressure-reducing cartridge
Design direct acting, electrically operated
Mounting method push-in cartridge, 4 mounting bolts M4x50
Tightening torque 2.6 Nm ± 10%
Size nominal size 2…5, cavity type AG
Weight 0.55 kg
Mounting attitude unrestricted (preferably vertical, coil down)
400-P-590101-EN-02/09.2023
Series DDRRZ-7011… to 7055…
2/6
Description, value, unitGeneral characteristics
Ambient temperature range -25°C … +50°C
MTTF
D
values 150 years, see data sheet 400-P-010101-en
Hydraulic characteristics Description, value, unit
Maximum operating pressure p
max
- standard model
(Inlet pressure)
- model “H”
70bar, pressure range “055”
50bar, pressure range “040”
40bar, pressure range “030”
30bar, pressure range “020”
20bar, pressure range “011”
100 bar, all pressure ranges
Flow range …15l/min
Nominal pressure ranges p
N
- model “055”
- model “040”
- model “030”
- model “020”
- model “011”
…55bar
…40bar
…30bar
…20bar
…11bar
Back pressure in T - static, not controlling
- while controlling
p
max
50bar
< 2 % p
N
Flow direction see symbols
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
for other fluids, please contact BUCHER
Hydraulic fluid temperature range -25°C … +70°C
Viscosity range 15…380mm
2
/s (cSt), recommended 20...130mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 18/16/13
Electrical characteristics Description, value, unit
Supply voltage 12V DC, 24V DC
Control current 12 V = 0…1400 mA, 24 V = 0…800 mA
Coil resistance R - cold value at 20°C
- cold value at -25°C
- max. warm value
12 V = 6.4Ω /24V = 17.2Ω
12 V = 5.2Ω /24V = 14.1Ω
12 V = 10.0Ω /24V = 27.0Ω
Inductance
Measured non-operated, at 0.1 mA (rms) / 1 kHz
12 V = 13 mH 24V = 38 mH
Recommended PWM frequency (dither) 200 Hz
Hysteresis with PWM 2…4 % I
N
Reversal error with PWM 2…4 % I
N
Sensitivity with PWM < 1 % I
N
Reproducibility with PWM < 2 % p
N
Relative duty cycle 100%
Nominal power consumption max. 19W
Insulation class to VDE 0580 H (180 °C)
Protection class to ISO20653 / EN60529 IP 65 / IP 67, see “Ordering code”
(with appropriate mating connector and
proper fitting and sealing)
Electrical connection DIN EN 175301-803, 3-pin 2 P+E (standard)
for other connectors, see “Ordering code”
400-P-590101-EN-02/09.2023
Series DDRRZ-7011… to 7055…
3/6
4 Performance graphs measured with oil viscosity 33mm
2
/s (cSt)
p = f (I) Pressure adjustment characteristic
P0077.ai
0
40
30
60
50
20
10
I [mA]0 200 400 500 600 700 800100 300
p
A
[bar]
p
N
11 bar
p
N
20 bar
p
N
30 bar
p
N
40 bar
p
N
55 bar
p = f (I) Pressure adjustment characteristic
P0078.ai
0
40
30
60
50
20
10
I [mA]0 400 800 1000 1200 1400200 600
p
A
[bar]
p
N
11 bar
p
N
20 bar
p
N
30 bar
p
N
40 bar
p
N
55 bar
p = f (Q) Pressure - Flow rate characteristic [DDRRZ-7055…]
P0083.ai
0
10
20
30
40
50
60
0
10
20
30
40
50
60
p
A
[bar]
Q [l/min]
2.5 32
1.5
10.51 0.51.522.530
A TP A
p [bar]
p = f (Q) Pressure - Flow rate characteristic [DDRRZ-7040…]
P0082.ai
0
10
20
30
40
50
0
10
20
30
40
50
p
A
[bar]
Q [l/min]
2.5 3 3.52
1.5
10.51 0.51.522.533.5 0
A TP A
p [bar]
400-P-590101-EN-02/09.2023
Series DDRRZ-7011… to 7055…
4/6
p = f (Q) Pressure - Flow rate characteristic [DDRRZ-7030…]
P0081.ai
0
10
20
30
40
0
10
20
30
40
p
A
[bar]
Q [l/min]
108642426810 0
A TP A
p [bar]
p = f (Q) Pressure - Flow rate characteristic [DDRRZ-7020…]
P0080.ai
0
5
10
15
20
25
30
0
5
10
15
20
25
30
p
A
[bar]
Q [l/min]
10 12864242681012 0
A TP A
p [bar]
p = f (Q) Pressure - Flow rate characteristic [DDRRZ-7011…]
P0079.ai
0
2
4
6
8
10
12
14
0
2
4
6
8
10
12
14
p
A
[bar]
Q [l/min]
14 1612
10
860224684
A TP A
p [bar]
400-P-590101-EN-02/09.2023
Series DDRRZ-7011… to 7055…
5/6
5 Dimensions & sectional view
36
Ø 30
M4 x 50
78.8
60.8
1
2
3
A
P
T
3
114
29.267.5(17.3)
5.9
44.2
62.2
28.6
Junior−Timer
Radial
J
1) 2)
M
A
= 2.6 [Nm] ± 10 %
1)
ISO 4400 / DIN 43 650 mating plug connection
2)
Junior Timer Radial plug connection
6 Installation information
IMPORTANT!
When fitting the cartridges, note the mounting atti
tude (preferably vertical, with coil down → auto
matic air bleed) and use the specified tightening
torque. No adjustments are necessary, since the
cartridges are set in the factory.
ATTENTION!
Only qualified personnel with mechanical skills
may carry out any maintenance work. Generally,
the only work that should ever be undertaken is to
check, and possibly replace, the seals. When
changing seals, oil or grease the new seals tho
roughly before fitting them.
Seal kit NBR no. DS-154-N
3)
Item Qty. Description
1 1 O-ring no. 021 ∅23,52x1,78 V70
2 1 O-ring no.013 ∅10,82x1,78 N70
3 1 O-ring no.012 ∅9,25x1,78 N70
IMPORTANT!
3)
Seal kit with FKM (Viton) seals, no. DS-154-V
400-P-590101-EN-02/09.2023
Series DDRRZ-7011… to 7055…
6/6
7 Ordering code
DDRRZ = proportional pressure-reducing
cartridge, direct acting
7 = pressure function, 3 way design
055 = pressure range …55 bar
040 = pressure range …40 bar
030 = pressure range …30 bar
020 = pressure range …20 bar
011 = pressure range …11 bar
2 = nominal size 2 for pressure range 055
2 = nominal size 2 for pressure range 040
3 = nominal size 3 for pressure range 030
4 = nominal size 4 for pressure range 020
5 = nominal size 5 for pressure range 011
(blank) = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
(special seals - please contact BUCHER)
(blank) = armature without orifice (standard)
H = armature with orifice (for higher inlet pressure, p
max
100 bar)
1 ... 9 = design stage (omit when ordering new units)
... = voltage e.g. 24 (24 V)
D = current DC
(blank) = DIN EN 175301-803 connection with mating plug (standard, IP65)
M100 = DIN EN 175301-803 connection without mating plug
J = Junior Timer radial plug connection without mating plug (protection class IP65)
D = Deutsch plug connection DT04-2P without mating plug (protection class IP67) on request
-
Ex.
_
--DDRRZ 7 055 2 -
_ _
2 24 D
8 Related data sheets
Reference (Old no.) Description
400-P-040011 (i-32) The form-tool hire programme
400-P-040141 (i-33.5) Cavity type AG
400-P-510101 Amplifier unit for proportional valves (1-channel) PBS-3A
400-P-712101 (G-2.50) Line-mounting body, type GAAA (G1/4”)
400-P-010101 MTTF
D
values for hydraulic valves
E 2023 by Bucher Hydraulics AG Frutigen, CH-3714 Frutigen
www.bucherhydraulics.cominfo.ch@bucherhydraulics.com
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 430.305.305.305.300.310