Proportional 3-Way Pressure-Reducing Cart., Size 4
Q
max
= 20l/min,p
max
= 210bar
Direct acting,electrically operated
Series DDRRY-7020… to 7100…
1/5
Reference: 400-P-590121-EN-02
Issue: 09.2023
S Compact push-in cartridge construction
for cavity type AG
S Operated by a proportional solenoid
S 4 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 DDRRY-70… proportional 3-way pressure-reducing
cartridges are direct acting, spool-type, push-in cartridges
and are available in size 4. They reduce the outlet pressure
in A as a function of the control current signal and indepen
dently of the inlet pressure in P. In the initial position (sole
noid de-energised) the inlet of the 3-way pressure-reducing
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 pres
sure rises above the preset level, the control spool opens
the A → T connection until balance is attained. Four pres
sure ranges are available, with maximum operating pres
sure (inlet pressure) p
max
210 bar. These 3-way pressure-
reducing cartridges are predominantly 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 mo
tors. 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 operating environments. For self-as
sembly, 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 4, cavity type AG
Weight 0.55 kg
Mounting attitude unrestricted (preferably vertical, coil down)
Ambient temperature range -25°C … +50°C
MTTF
D
values 150 years, see data sheet 400-P-010101-en
400-P-590121-EN-02/09.2023
Series DDRRY-7020… to 7100…
2/5
Hydraulic characteristics Description, value, unit
Maximum operating pressure p
max
(inlet pressure) 210 bar, all pressure ranges
Flow range …20l/min
Nominal pressure ranges p
N
- model “100”
- model “050”
- model “030”
- model “020”
…100bar
…50bar
…30bar
…20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-590121-EN-02/09.2023
Series DDRRY-7020… to 7100…
3/5
4 Performance graphs measured with oil viscosity 33mm
2
/s (cSt)
p = f (I) Pressure adjustment characteristic
P0088.ai
0
80
60
120
100
40
20
I [mA]0 200 400 500 600 700 800100 300
p
A
[bar]
p
N
50 bar
p
N
30 bar
p
N
20 bar
p
N
100 bar
p = f (I) Pressure adjustment characteristic
P0089.ai
0
80
60
120
100
40
20
I [mA]0 400 800 1000 1200 1400200 600
p
A
[bar]
p
N
50 bar
p
N
30 bar
p
N
20 bar
p
N
100 bar
p = f (Q) Pressure - Flow rate characteristic [DDRRY-7100…]
P0093.ai
0
40
80
120
160
0
40
80
120
160
p
A
[bar]
Q [l/min]
201510510 51520 0
A TP A
p [bar]
p = f (Q) Pressure - Flow rate characteristic [DDRRY-7050…]
P0092.ai
0
20
40
60
80
0
20
40
60
80
p
A
[bar]
Q [l/min]
20
15
10510 515
20
0
A TP A
p [bar]
p = f (Q) Pressure - Flow rate characteristic [DDRRY-7030…]
P0091.ai
0
10
20
30
40
0
10
20
30
40
p
A
[bar]
Q [l/min]
20
15
10510 515
20
0
A TP A
p [bar]
400-P-590121-EN-02/09.2023
Series DDRRY-7020… to 7100…
4/5
p = f (Q) Pressure - Flow rate characteristic [DDRRY-7020…]
P0090.ai
0
5
10
15
20
25
30
0
5
10
15
20
25
30
p
A
[bar]
Q [l/min]
20
15
10510 515
20
0
A TP A
p [bar]
5 Dimensions & sectional view
36
Ø 30
M4 x 50
78.8
60.8
1
2
3
A
P
T
3
113.5
28.767.5(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
400-P-590121-EN-02/09.2023
Series DDRRY-7020… to 7100…
5/5
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
7 Ordering code
DDRRY = proportional pressure-reducing
cartridge, direct acting
7 = pressure function, 3 way design
100 = pressure range …100 bar
050 = pressure range …50 bar
030 = pressure range …30 bar
020 = pressure range …20 bar
4 = nominal size 4
(blank) = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
(special seals - please contact BUCHER)
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.
_
--DDRRY 7 100 4 -
_
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: 430.305.305.305.305.310