Proportional 4/2 Throttle Cartridge, Size 5
Q
max
= 30 l/min,p
max
= 250bar
Sliding-spool design, direct acting
Series MDR42…-5…
1/7
Reference: 400-P-618201-EN-04
Issue: 03.2022
S Compact construction
for cavity type AN – 3/4-16 UNF
S Dual flow paths for higher flow rate
S Low headloss
S For use with inline or bypass
pressure-compensator cartridges
S Reliable operation over the whole pressure
and flow range
S With optional manual flow setting
S All exposed parts with zinc-nickel plating
S High pressure wet-armature solenoids
S The slip-on coil can be rotated, and it can be
replaced without opening the hydraulic envelope
S Various plug-connector systems and voltages
are available
1 Description
Series MDR42… direct acting proportional 4/2 throttle val
ves are size 5, high performance screw-in cartridges with a
3/4-16 UNF mounting thread. They are designed on the pro
ven sliding-spool principle. The straightforward design deli
vers an outstanding price/performance ratio. "De-energised
closed" and "de-energised open" functions are available. In
control mode, the flow through the connections 1 → 3 und
4 → 2 is varied in proportion to the control current. Thanks
to these dual flow paths, a higher flow rate is achieved with
low headloss. It is essential that ports 1+4, and likewise 2
+ 3, are joined together in the valve housing (manifold
block). In combination with inline or bypass compensators,
these 4/2 throttle cartridges are predominantly used in mo
bile and industrial applications to allow a flow in hydraulic in
stallations to be controlled electro-proportionally. All exter
nal 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. The slip-on coils can be
replaced without opening the hydraulic envelope and can
be positioned at any angle through 360°. For self-assembly,
please refer to the section related data sheets.
2 Symbol
Dual flow paths
2
1
3
4
2
1
3
4
2
1
3
4
MDR42AD…-E MDR42AD… MDR42ANK…
IMPORTANT!
To enable the dual flow-path function, ports 1 + 4
and 2 + 3 must be connected within the valve hou
sing (manifold block).
400-P-618201-EN-04/03.2022
Series MDR42…-5…
2/7
3 Technical data
General characteristics Description, value, unit
Designation proportional 4/2 throttle cartridge
Design sliding-spool design, direct acting
Mounting method screw-in cartridge 3/4-16UNF
Tightening torque 40 Nm ± 10%
Size nominal size 5, cavity type AN
Weight 0.40 kg
Mounting attitude unrestricted (preferably vertical, coil down)
Ambient temperature range -25°C … +50°C
Hydraulic characteristics Description, value, unit
Maximum operating pressure 250 bar
Maximum flow rate 30l/min
Nominal flow rate 1+4 → 2+3 25l/min at Δp = 4bar
Leakage flow rate < 400 cm
3
/min (with p
N
250 bar)
with oil viscosity 33 mm
2
/s (cSt)
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…760 mA
Power consumption at max. control current max. 19W
Coil resistance R - cold value at 20°C
- max. warm value
12 V = 5.8Ω/24V = 21Ω
12 V = 8.6Ω/24V = 32Ω
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%
Protection class to ISO20653 / EN60529 IP 65 / IP 67 / IP 69K, 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-618201-EN-04/03.2022
Series MDR42…-5…
3/7
4 Performance graphs measured with oil viscosity 33mm
2
/s (cSt)
For use with compensator (max. Dp = 15 bar)
Δp = f (Q) Pressure drop - Flow rate characteristic
P0170.ai
0
1
2
3
4
5
6
Q [l/min]302520151050
p [bar]
Q = f (I; Δp) Flow rate adjustment characteristic
P0171.ai
0
35
15
20
25
10
5
I [mA]200 300 400 500 600 700
I [mA]400
100
200
0
600 800 1000 1200 1400
Q [l/min]
30 DW = F06
1)
DW = F06
1)
Q = f (Δp; I) Flow rate adjustment characteristic
MDR42AD…
P0387.ai
0
30
20
10
5
Q [l/min]
25020015010050
0 p2 [bar]
I = 700 / 1400 mAI = 700 / 1400 mA
I = 600 / 1200 mAI = 600 / 1200 mA
I = 400 / 800 mAI = 400 / 800 mA
I = 500 / 1000 mAI = 500 / 1000 mA
DW = F06
1)
25
15
Q = f (Δp; I) Flow rate adjustment characteristic
MDR42ANK…
P0388.ai
0
35
20
10
5
Q [l/min]
25020015010050
0 p2 [bar]
I = 0 mAI = 0 mA
I = 300 / 600 mAI = 300 / 600 mA
I = 500 / 1000 mAI = 500 / 1000 mA
I = 400 / 800 mAI = 400 / 800 mA
DW = F06
1)
30
15
25
IMPORTANT!
1)
Performance graphs measured with compensator model DWDPA-5D-10-F06-2
5 Installation information
IMPORTANT!
To achieve the maximum performance rating, fit
the solenoid coil as shown (with the plug pins at
the bottom) and install the valve in a steel body.
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.
400-P-618201-EN-04/03.2022
Series MDR42…-5…
4/7
6 Dimensions & sectional view
Without manual flow setting – standard
M
A
= 15 [Nm] ± 10 %
13
M
A
= 2.7 [Nm] ± 10 %
A
B
Ø
3/4−16UNF
9
5
8
4
3
7
2
1
6
6
1
2
3
4
M
A
= 2.7 [Nm] ± 10 %
24
M
A
= 40 [Nm] ± 10 %
53
134
81
40
72.5
54.5
36
MDR42AD...
1
2
3
4
MDR42ANK...
Seal kit no. DS-248-N
2)
Item Qty. Description
1 1 O-ring ∅18,00x2,00 FKM
2 1 O-ring no. 017 ∅17,17x1,78 N90
3 1 O-ring no.014 ∅12,42x1,78 N90
4 1 O-ring no.013 ∅10,82x1,78 N90
5 1 O-ring no. 012 ∅09,25x1,78 N90
6 2 O-ring ∅16,00x2,00 FkM
7 1 Backup ring ∅10.70x1.45x1.40 FI0751
8 1 Backup ring ∅09.40x1.45x1.00 FI0751
9 1 Backup ring ∅07.80x1.45x1.00 FI0751
IMPORTANT!
2)
Seal kit with FKM (Viton) seals no. DS-248-V
Air-bleeding
If necessary, air can be purged from these proportional
throttle cartridges by using the cap nut (Item B). The pro
cedure is as follows:
A Knurled nut
B Cap nut
Steps:
1. Slacken and remove the knurled nut.
2. Slacken the cap nut approx. 1.5 turns.
Caution: Slackening the cap nut allows oil to spray out!
3. Switch the proportional throttle cartridge ON/OFF
several times until no more air bubbles escape.
4. Tighten the cap nut.
5. Refit the knurled nut and tighten it.
400-P-618201-EN-04/03.2022
Series MDR42…-5…
5/7
With manual flow setting – Option “E”
Ø 36
4
3
1
2
53
160.4
107.4
66.4
54.5
72.5
M
A
= 10 [Nm] ± 10 %
2
C
D
M
A
= 1 [Nm] ±10%
2
1
3
4
Integral air-bleeding
If necessary, air can be purged from these proportional
throttle cartridges by using the integral air-bleed screw
(Item D). The procedure is as follows:
C Protective cap
D Air-bleed screw
Steps:
1. Remove the protective cap.
2. Slacken the air-bleed screw approx. 2 turns.
3. Switch the proportional throttle cartridge ON/OFF
several times until no more air bubbles escape.
4. Tighten the air-bleed screw.
5. Fit the protective cap.
400-P-618201-EN-04/03.2022
Series MDR42…-5…
6/7
7 Manual flow setting
Optionally, the proportional throttle cartridges can be sup
plied with an integral manual flow setting. If a proportional
solenoid is faulty, for example, this manual flow setting en
ables the required flow rate to be set mechanically. This
manual flow setting is not designed for adjusting the flow in
a dynamic control mode.
4
E
G
F
13
M
A
= 10 [Nm] ± 10 %
E Protective cap
F Lock nut (13 A/F)
G Adjusting spindle for volume setting
Setting the flow rate manually
Steps:
1. Remove the protective cap.
2. Slacken the lock nut (13 A/F).
3. Screw in (turn to right) the adjusting spindle (4 A/F) until
the required flow rate is set.
4. Tighten the lock nut (13 A/F).
5. Fit the protective cap.
Restoring the factory settings
Steps:
1. Solenoid de-energised.
2. Remove the protective cap.
3. Slacken the lock nut (13 A/F).
4. Unscrew the adjusting spindle (4 A/F) to its end-stop,
then screw it in 2 1/8 turns.
5. Tighten the lock nut (13 A/F).
6. Fit the protective cap.
8 Application examples
Used with bypass pressure-compensator cartridge
M
V1
8 bar
BDW
MDR42ADN...
23
41
Classic combination with inline and bypass pressure-com
pensator cartridges
M
V1 V2
8 bar
6 bar
6 bar
IDW−F06
IDW−F06
WV
BDW
MDR42ADN... MDR42ADN...
23
41
23
41
400-P-618201-EN-04/03.2022
Series MDR42…-5…
7/7
9 Ordering code
M 42AD
M = flow-control valve
D = direct acting
R = proportional solenoid
42AD = 4/2 function (de-energised closed)
42ANK = 4/2 function (de-energised open)
N = electrically operated, VDC = 27 W
A ... Q = type only for use with compensator (standard)
Z ... R = special features - please consult BUCHER
5 = nominal size 5
(blank) = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
(special seals - please contact BUCHER)
(blank) = no manual flow setting (standard)
E = with manual flow setting
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
C = Kostal plug connection (IP65)
JT = Junior Timer radial plug connection (with protection diode, IP65)
IT = Junior Timer axial plug connection (with protection diode, IP65)
D = Deutsch plug connection 45° DT04-2P (IP67/69K) mating plug not supplied
DT = Deutsch plug connection 45° DT04-2P (with protection diode, IP67/69K)
S = AMP Superseal 1.5 (IP67) / Metri-Pack 150 (IP65) plug connection
F = flying leads (500 mm)
_
-
Ex.
_
AR N 5D -
_
1 24 D
10 Related data sheets
Reference (Old no.) Description
400-P-040011 (i-32) The form-tool hire programme
400-P-040181 (i-33.12) Cavity type AN
400-P-120110 (W-2.141) Coils for screw-in cartridge valves series D36
400-P-510101 Amplifier unit for proportional valves (1-channel) PBS-3A
E 2022 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: 430.310.325.305.310.310