Inverse Prop. 3-Way Pressure-Reducing Cart., Size 2...4
Q
max
= 12l/min,p
max
= 70bar
Direct acting,electrically operated
Series DRDCA-7…
1/6
Reference: 400-P-590801-E-01
Issue: 05.2012
S Compact design offers space-saving installation
S Push-in cartridge for Bucher standard
cavity type AGA
S Can be turned through 360° at installation
S Operated by a proportional solenoid
S Nominal pressure when solenoid de-energised
(fail-safe function)
S 4 pressure ranges available
S Excellent stability over the whole pressure
and flow range
S Coils protected against penetration by water
S Various plug-connector systems and voltages
are available
S All external parts zinc plated, chromited (CrVI-free)
S Can be fitted in a line-mounting body
1 Description
Series DRDCA-7… inverse proportional 3-way pressure-
reducing cartridges with a compact solenoid system are di
rect acting, spool-type, push-in cartridges with a falling
pressure-current characteristic and are available in sizes
2...4. They reduce the outlet pressure in A as a function of
the control current signal and independently of the inlet
pressure in P. In the initial position (solenoid de-energised)
the connection P → A is open and the connection to tank
A→ T is closed. In control mode, the connection P → A re
main open until the pressure in port A reaches the preset le
vel. If the pressure rises above the preset level, the control
spool opens the A → T connection until balance is attained.
Four pressure ranges are available in order to obtain pre
cise pressure settings over the whole of the required pres
sure range. The maximum operating pressure depends on
the particular pressure range. These 3-way pressure-re
ducing 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. The advantages are the small space requirement,
360° rotatability at installation, and easy installation of the
plug-in cartridge thanks to the mounting clip. The compact
solenoid system also offers an ideal price/performance ra
tio, which is vital for reducing operating costs and capital ex
penditures. All external parts of the cartridge are zinc plated
and chromited (CrVI-free) and are thus suitable for use in
the harshest operating environments. If you intend to manu
facture your own cavities or are designing a line-mounting
installation, please refer to the section “Related data
sheets”.
2 Symbol
A
P
T
3 Technical data
General characteristics Description, value, unit
Designation Inverse proportional 3-way pressure-reducing cartridge
Design direct acting, electrically operated
Mounting method push-in cartridge with mounting clip
for 2 cap screws, M4 x 12
Tightening torque 1.8 Nm ± 10%
400-P-590801-E-01/05.2012
Series DRDCA-7…
2/6
Description, value, unitGeneral characteristics
Size nominal size 2…4, cavity type AGA
Weight 0.45 kg
Mounting attitude unrestricted (preferably vertical, coil down)
Ambient temperature range -25°C … +50°C
Hydraulic characteristics Description, value, unit
Maximum operating pressure p
max
(Inlet pressure)
70bar, pressure range “45”
50bar, pressure range “28”
50bar, pressure range “22”
40bar, pressure range “16”
Flow range …12l/min
Nominal pressure ranges p
N
- model “45”
- model “28”
- model “22”
- model “16”
…45bar
…28bar
…22bar
…16bar
Back pressure in T - static, not controlling
- while controlling
p
max
10bar
< 2 % p
N
Flow direction see symbols
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
for other fluids, please consult 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…1500 mA, 24 V = 0…800 mA
Coil resistance R - cold value at 20°C
- max. warm value
12 V = 4.8Ω/24V = 17.6Ω
12 V = 8.0Ω/24V = 28.0Ω
Recommended PWM frequency (dither) 200 Hz
Hysteresis with PWM 4…6 % I
N
Reversal error with PWM 4…6 % I
N
Sensitivity with PWM < 1 % I
N
Reproducibility with PWM < 2 % p
N
Relative duty cycle 100%
Nominal power consumption max. 18W
Protection class to EN 60 529 IP 65 / IP 67 / IP 69K, see “Ordering code”
(with appropriate mating connector and
proper fitting and sealing)
Electrical connection 3-pin square plug to ISO 4400 / DIN 43 650 (standard)
for other connectors, see “Ordering code”
400-P-590801-E-01/05.2012
Series DRDCA-7…
3/6
4 Performance graphs measured with oil viscosity 33mm
2
/s (cSt)
p = f (I) Pressure adjustment characteristic
P0297.ai
0
40
30
50
20
10
I[mA]0 200 400 500 600 700 800100 300
p
A
[bar]
p
N
45 barp
N
45 bar
p
N
28 barp
N
28 bar
p
N
22 barp
N
22 bar
p
N
16 barp
N
16 bar
p = f (I) Pressure adjustment characteristic
P0298.ai
0
40
30
50
20
10
I[mA]0 500 1000 1250 1500250 750
p
A
[bar]
p
N
45 barp
N
45 bar
p
N
28 barp
N
28 bar
p
N
22 barp
N
22 bar
p
N
16 barp
N
16 bar
p = f (Q) Pressure - Flow rate characteristic [DRDCA-7045…]
P0302.ai
0
15
30
45
60
0
15
30
45
60
p
A
[bar]
Q[l/min]
2.5 3 3.52
1
.510.510.51.522.533.5 0
A TPA
p[bar]
p = f (Q) Pressure - Flow rate characteristic [DRDCA-7028…]
P0301.ai
0
8
16
24
32
40
0
8
16
24
32
40
p
A
[bar]
Q[l/min]
543011233.54 2
A TPA
p [bar]
400-P-590801-E-01/05.2012
Series DRDCA-7…
4/6
p = f (Q) Pressure - Flow rate characteristic [DRDCA-7022…]
P0300.ai
0
6
12
18
24
30
0
6
12
18
24
30
p
A
[bar]
Q[l/min]
1
086022468 4
A TPA
p [bar]
p = f (Q) Pressure - Flow rate characteristic [DRDCA-7016…]
P0299.ai
0
5
10
15
20
0
5
10
15
20
p
A
[bar]
Q[l/min]
12
1
08602246810 4
A TPA
p [bar]
400-P-590801-E-01/05.2012
Series DRDCA-7…
5/6
5 Dimensions & sectional view
Junior −Timer
Radial
J
4
3
.5
5
2
.
1
34.3
9
26.6
AMPSEAL −16
Axial
A
74
4.5
83
112.2
29.2
9
24.4
1
2
3
M4x12
2)
Ø 36
3
Ma =1.8 [Nm]
±10 %
A
P
T
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 thor
oughly before fitting them.
Seal kit NBR no. DS-154-N
1)
Item Qty. Description
1 1 O-ring no. 021 ∅23,52x1,78 N90
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!
1)
Seal kit with FKM (Viton) seals, no. DS-154-V
2)
Valve mounting bolts M4x12
(included in the delivery)
400-P-590801-E-01/05.2012
Series DRDCA-7…
6/6
7 Ordering code
DRD = pressure-reducing cartridge, direct acting,
inverse type (pulling)
C = compact solenoid (proportional)
A ... Q = standard model - see relevant data sheets
Z ... R = special features - please consult BUCHER
7 = pressure function, 3 way design
045 = pressure range …45 bar
028 = pressure range …28 bar
022 = pressure range …22 bar
016 = pressure range …16 bar
2 = nominal size 2 for pressure range 045
3 = nominal size 3 for pressure range 028
3 = nominal size 3 for pressure range 022
4 = nominal size 4 for pressure range 016
(blank) = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
(special seals - please consult BUCHER)
1 ... 9 = design stage (omit when ordering new units)
... = voltage e.g. 24 (24 V)
D = current DC
J = Junior Timer radial plug connection (IP65)
I = Junior Timer axial plug connection (IP65) mating plug not supplied
A = AMPSEAL 16-axial plug connection (IP65/67/69K)
for the following plug-variants, please consult Bucher:
(blank) = ISO 4400 / DIN 43 650 mating plug
D = Deutsch plug connection DT04-2P (IP65/67/69K
IP65/IP67)
mating plug not supplied
F = flying leads (500 mm)
_
-
Ex.
--
DRD 7 045 22
_
C A 24 D
8 Related data sheets
Reference (Old no.) Description
400-P-040011 (i-32) The form-tool hire programme
400-P-040142 Cavity type AGA
400-P-712101 Line-mounting body, type GAAA (G1/4”)
400-P-510101 Amplifier unit for proportional valves (1-channel) PBS-3A
400-P-511101 (P-3) Amplifier card, 1-channel for valves with one solenoid, type SAN-535…
E 2012 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