Proportional Throttle Cartridges, Size10
Qmax = 45l/min,pmax = 250bar
Direct acting,de-energised closed,with port for secondary unloading
Series MDRPA-…
S Sliding-spool design
S Model with port Z for secondary unloading
(Load Sensing)
S Compact construction for cavity types DD or DC (with
adapter ring C)
S 4 nominal flow ranges
S All exposed parts with zinc-nickel plating
S High pressure wet-armature solenoids
S Various plug-connector systems and voltages
are available
S Optionally with auxiliary manual adjustment
(via rotary knob)
S Can be fitted in a line-mounting body
S Can be fitted in sandwich bodies
1
Description
Series MDRPA… direct acting proportional throttle valves
are size 10, high performance screw-in cartridges with an
M24 x 1.5 mounting thread. They are designed on the pro­
ven sliding-spool principle and can be fitted in cavity types
DD or DC. The rate of flow changes in proportion to the
change in the required value (amplifier output current). In
the initial position (solenoid de-energised) the connection
A B is closed. The additional port Z is used for secondary
unloading from B  Z in applications where an LS line (load
sensing) is required. The proportional throttle cartridges are
available in 4 nominal flow ranges. The flow ranges QN = 12
and 20 l/min can be used with the maximum pressure diffe­
rential from A  B (p 250 bar). Conversely, the flow ranges
QN = 30 and 40 l/min must only be used in combination with
2
Symbol
B
B
A
A
MDRPA-…G-10…
3
inline or bypass pressure-compensator cartridges (max.
permissible p from A  B  14 bar or  9 bar respectively).
As an option, the cartridges can be provided with an auxi­
liary manual adjustment (rotary knob) for setting the requi­
red flow rate mechanically if, for example, a proportional so­
lenoid is defective. In both mobile and industrial applica­
tions, these proportional throttle cartridges are the ideal
choice for responsive and controlled lifting and lowering mo­
vements where large pressure differentials exist. All exter­
nal parts of the cartridge are zinc-nickel plated to DIN
50979 and are thus suitable for use in the harshest operat­
ing environments. If you intend to manufacture your own ca­
vities or are designing a line-mounting installation, please
refer to the section “Related data sheets”.
Z
MDRPA-DGE-10…
Technical data
General characteristics
Description, value, unit
Designation
proportional throttle cartridge
Design
direct acting, sliding-spool design,
model with secondary unloading (B  Z) available
Mounting method
screw-in cartridge M24x1.5
Reference: 400-P-610101-EN-03
Issue: 09.2015
1/8
General characteristics
Description, value, unit
Size
nominal size 10, cavity type DD
or cavity type DC (option with adapter ring C)
Weight
1.15 kg
Mounting attitude
unrestricted (preferably vertical, coil down)
Ambient temperature range
-25°C … +50°C
Hydraulic characteristics
Description, value, unit
Maximum operating pressure
250bar
Maximum flow rate
45l/min
Nominal flow rate QN
- model “120”
- model “200”
- model “300”
- model “400”
12l/min
20l/min
30l/min 1)
40l/min 1)
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…380mm2/s (cSt), recommended 20...130mm2/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 18/16/13
ATTENTION!
1) Must only be used in combination with inline or
bypass pressure-compensator cartridges.
30 l/min = 3 14 bar permissible p from A B
40 l/min = 3 9 bar permissible p from A B
See performance graphs and application
examples.
Electrical characteristics
Description, value, unit
Supply voltage
12V DC, 24V DC
Control current
12 V = 300…1400 mA, 24 V = 150…700 mA
Coil resistance R
- cold value at 20°C
- cold value at -25°C
- max. warm value
Inductance
12 V = 6.4 /24V = 24.5
12 V = 5.2 /24V = 20.0
12 V = 10.0 /24V = 38.4
12 V = 13 mH
24V = 54 mH
Measured non-operated, at 0.1 mA (rms) / 1 kHz
Recommended PWM frequency (dither)
150…200 Hz
Hysteresis with PWM
2…4 % IN
Reversal error with PWM
2…4 % IN
Sensitivity with PWM
< 1 % IN
Reproducibility with PWM
< 2 % pN
Relative duty cycle
100%
Nominal power consumption
max. 19W
Insulation class to VDE 0580
H (180 °C)
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400-P-610101-EN-03/09.2015
Series MDRPA-…
Electrical characteristics
Description, value, unit
Protection class to ISO20653 / EN60529
IP65
(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”
4
Performance graphs
measured with oil viscosity 33mm2/s (cSt)
Can be used without pressure compensators - nom. flow ranges QN 12 and 20 l/min
p = f (Q) Pressure drop - Flow rate characteristic [„120“]
pA
6
p = f (Q) Pressure drop - Flow rate characteristic [„200“]
B [bar]
pA
6
P0112.ai
5
B [bar]
P0113.ai
5
I = 700 / 1400 mA
4
I = 700 / 1400 mA
4
3
3
A
2
2
1
1
0
0
2
4
6
8
10
12 Q [l/min]
A
0
0
5
B
10
15
20 Q [l/min]
Q = f (p; I) Flow rate adjustment characteristic [„120“]
Q = f (p; I) Flow rate adjustment characteristic [„200“]
Q [l/min]
Q [l/min]
25
P0114.ai
30
P0115.ai
I = 700 / 1400 mA
I = 600 / 1200 mA
I = 500 / 1000 mA
10
I = 400 / 800 mA
5
I = 300 / 600 mA
0
50
100
150
200
250
I = 600 / 1200 mA
20
15
0
I = 700 / 1400 mA
25
20
p [bar]
15
I = 500 / 1000 mA
10
I = 400 / 800 mA
5
I = 300 / 600 mA
0
0
50
100
150
200
250
p [bar]
Q = f (I; p) Flow rate adjustment characteristic [„120“]
Q = f (I; p) Flow rate adjustment characteristic [„200“]
Q [l/min]
Q [l/min]
30
P0116.ai
30
25
25
20
20
p 50 bar
15
p 250 bar
10
5
5
200
400
300
600
400
800
400-P-610101-EN-03/09.2015
Series MDRPA-…
500
1000
600
1200
700 I [mA]
1400 I [mA]
p 50 bar
15
10
0
100
200
P0117.ai
0
100
200
p 250 bar
200
400
300
600
400
800
500
1000
600
1200
700 I [mA]
1400 I [mA]
3/8
Must be used with pressure compensators - QN 30 and 40 l/min
p = f (Q) Pressure drop - Flow rate characteristic [„300“]
pA
6
p = f (Q) Pressure drop - Flow rate characteristic [„400“]
B [bar]
pA
6
P0118.ai
5
B [bar]
P0119.ai
5
I = 700 / 1400 mA
4
I = 700 / 1400 mA
4
3
3
A
2
A
2
1
1
0
0
5
10
15
20
25
30 Q [l/min]
0
0
10
20
30
40 Q [l/min]
Q = f (p; I) Flow rate adjustment characteristic [„300“]
Q = f (p; I) Flow rate adjustment characteristic [„400“]
Q [l/min]
Q [l/min]
40
P0120.ai
30
pA
B
14 bar
pA
B
5 bar
I = 700 / 1400 mA
50
pA
B
9 bar
P0121.ai
40
I = 700 / 1400 mA
pA
B
5 bar
30
20
10
0
I = 500 / 1000 mA
20
I = 400 / 800 mA
10
0
50
100
150
200
250 pB [bar]
Q = f (I; p) Flow rate adjustment characteristic [„300“]
I = 400 / 800 mA
0
50
100
150
200
250 pB [bar]
Q = f (I; p) Flow rate adjustment characteristic [„400“]
Q [l/min]
Q [l/min]
40
0
I = 500 / 1000 mA
P0122.ai
50
P0123.ai
40
30
p 9 bar
p 14 bar
30
20
p 5 bar
20
p 5 bar
10
0
100
200
10
200
400
300
600
400
800
500
1000
600
1200
700 I [mA]
1400 I [mA]
0
100
200
200
400
300
600
400
800
500
1000
600
1200
700 I [mA]
1400 I [mA]
ATTENTION!
Must only be used in combination with inline or by­
pass pressure-compensator cartridges.
30 l/min = 3 14 bar permissible p from A  B
40l/min = 3 9bar permissible p from A  B
See performance graphs and application
examples.
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400-P-610101-EN-03/09.2015
Series MDRPA-…
5
Dimensions & sectional view
5.1 Model without secondary unloading
Nominal flow ranges QN 12 and 20 l/min
Nominal flow ranges QN 30 and 40 l/min
A
A
1
47.5
3
4
M24x1.5
2
10
(Option)
MA= 2)
27
max.152
B
35.5
B
Junior−Timer
Radial
J
15.5
1)
max.116.5
max.104.5
36
2)
44.2
62.2
3
MA= 2.6 [Nm] 10 %
60.8
78.8
Tightening torque MA 2)
±10%
Cavity type
DD
DC
Can be fitted in steel
65[Nm]
100[Nm]
Can be fitted in aluminium
50[Nm]
100[Nm]
NBR seal kit no. DS-265-N 3)
5.2 With secondary unloading (port Z)
Item
Qty.
1
1
Description
O-ring
2
1
O-ring
no. 020 21,95x1,78
N90
3
1
O-ring
no. 117 20,29x2,62
N90
4
1
O-ring
27,00x1,50
N70
QN 12 and 20 l/min
22.10/16.50 x 2.50
QN 30 and 40 l/min
A
A
B
B
IMPORTANT!
3)
Seal kit with FKM (Viton) seals, no. DS-265-V
Z
Option with adapter ring C
Item
Qty.
10
1
Z
Description
Adapter ring C
400-P-610101-EN-03/09.2015
Series MDRPA-…
32.00 x 12.00
5/8
6
Auxiliary manual adjustment (S508B)
As an option, series MDRPA... proportional throttle car­
tridges can be provided with an auxiliary manual adjust­
ment, type S508B, for setting the required flow rate mechan­
ically if, for example, a proportional solenoid is defective.
The auxiliary manual adjuster also incorporates an airbleed screw (item E), which allows air to be bled from the
cartridges in special applications.
S manual override if power supply or solenoid fail
S protected against water splash/spray
A
Z
40.6
S the flow rate can be set mechanically
B
E
ø35
1.5
M A= 0.5 [Nm] 10 %
7
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.
7.1 Orientation of proportional solenoid
ATTENTION!
There must always be a uniform gap all the way
round between the mounting flange and the pro­
portional solenoid.
A Solenoid retaining screws (4 pcs.)
B Proportional solenoid V 36 mm
C Mounting flange V 35 mm
D Existing gap between solenoid and flange
C
After the throttle cartridge has been tightened in its cavity,
the proportional solenoid's plug connector might not be
facing the required direction. Use the following procedure to
realign the solenoid to the required position:
36
D
35
B
1. Loose the M4 solenoid retaining screws a little (3 A/F).
2. Align the solenoid so that the plug connector is facing
the required direction.
3. Tighten the proportional solenoid to the mounting flange
with the M4 retaining screws (Ma 2.6 Nm 10%).
A
3
MA= 2.6 [Nm] 10 %
4. After re-assembly, check that there is a uniform gap all
the way round between the mounting flange and the pro­
portional solenoid.
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400-P-610101-EN-03/09.2015
Series MDRPA-…
8
Application examples
8.1 Used without pressure compensator
8.2 Used with secondary unloading
Proportional throttle cartridges with QN = 12 and 20 l/min
can be used in applications in which the maximum p from
A  B (250 bar) may occur.
Proportional throttle cartridges with QN = 30 and 40 l/min
must only be used in combination with pressure-compensa­
tor cartridges. A bypass compensator can also be used in­
stead of an inline compensator.
p A  B:
 14 bar for QN 30 l/min
 9 bar for QN 40 l/min
V1
V1
MDRPA...
B
B
9 resp. 14 bar
A
A
IDW
MDRPA...
DBV
DBV
M
M
8.3 Used with pressure compensator
8.4 Classic combinations
Typical use of a proportional throttle cartridge with addi­
tional port Z for secondary unloading. This circuit includes
the following functions:
Typical application of proportional throttle cartridges (QN =
30 and 40 l/min) for parallel operation of two actuators (V1,
V2) with different load pressures. To avoid exceeding the
maximum permissible p from A  B, inline pressure-com­
pensator cartridges (IDW) are positioned before the
throttles. When an actuator is not being used, its LS line is
unloaded through the B  Z connection. When both actua­
tors are unloaded, unpressurised flow circulates through
the bypass pressure-compensator cartridge (BDW).
S MDRPA…de-energised = unpressurised flow through
bypass compensator (BDW)
S MDRPA… energised
= stepless and load-independent speed control at V1
S MDRPA… energised
= LS operation with fixeddisplacement pump
V1
B
MDRPA ...
A
V1
MDRPA...
Z
V2
B
A
MDRPA...
WV
Z
B
A
Z
IDW
IDW
6 bar
LS
6 bar
BDW
M
8 bar
M
400-P-610101-EN-03/09.2015
Series MDRPA-…
BDW
7/8
9
Ordering code
Ex.
MD R P A - D G _ - 10 - 200 _ - 5
MD
= throttle valve, direct acting
R
= proportional-solenoid operated
P
A ... Q
Z ... R
= cartridge design
= standard model - see relevant data sheets
= special features - please consult BUCHER
D
C
G
= cavity type DD (standard)
= cavity type DC (option with adapter ring C)
= de-energised closed
E
10
= with port Z for secondary unloading
(in cavity type “DD” only)
= nominal size 10mm
120
200
300
400
=
=
=
=
24 D
_
_
nominal flow rate 12l/min
nominal flow rate 20l/min
nominal flow rate 30l/min (max. p 14 bar)
nominal flow rate 40l/min (max. p 9 bar)
(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) = ISO 4400 / DIN 43 650 mating plug (standard, IP65)
M100 = without mating DIN plug
J
= Junior Timer radial plug connection without mating plug (protection class IP65)
S508B = as option: auxiliary manual adjustment (via rotary knob) - mechanical air bleed
10 Related data sheets
Reference
(Old no.)
Description
400-P-040011
(i-32)
The form-tool hire programme
400-P-060121
(i-45.2)
Cavity type DD
400-P-060111
(i-45.1)
Cavity type DC (option with adapter ring C)
400-P-330101
(D-28.12)
Bypass compensator cartridge, size 10, direct acting, type DWDPA-2D…
400-P-330201
(D-28.22)
Bypass compensator cartridge, size 10, two-stage, type DWVPA/Z-2D…
400-P-330501
(D-28.55)
Inline compensator cartridge, size 10, direct acting, type DWDPA-5D…
400-P-511101
(P-3)
Amplifier card, 1-channel for valves with one solenoid, type SAN-535…
400-P-740111
(G-24.21)
Line- and manifold-mounting body, type DD-12 (G1/2”)
400-P-740101
(G-24.20)
Line- and manifold-mounting body, type DC-12 (G1/2”)
info.ch@bucherhydraulics.com
www.bucherhydraulics.com
E 2015 by Bucher Hydraulics AG Frutigen, CH-3714 Frutigen
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: 430.310.325.305.320.310
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400-P-610101-EN-03/09.2015
Series MDRPA-…