Flow Divider
Bi-directional
Series MTDA
1/6
Reference: 100-P-000052-EN-13
Issue: 01.2024
S robust, simple and reliable
S easy to service
S flows can be split or merged with accuracy
(divide/combine functions).
S the flow division ratio can be altered to suit
customer requirements.
S ZnNi coating (>720h NSST)
1 Description
1.1 General
Series MTDA units are flow dividing valves that operate
automatically. They are intended for use with hydraulic flu
ids. They divide a flow, the total rate of which may be varied,
up to 4 part-flows. When flow passes through a valve in the
opposite direction, the part-flows are combined into one sin
gle flow (added). The dividing and combining functions are
largely independent of the pressures of the divided flows
and of the fluid viscosity.
In order for the valve to work properly, a continuous flow is
required at all ports. For example, if one actuator is no
longer able to move, then the other part-flow will also be re
stricted. If the actuators served by the flow divider operate
at different pressures, then the pressure of the total flow en
tering the valve will correspond to the higher of the two actu
ator pressures. Large pressure differences may give rise to
significant heat generation, which must be taken into con
sideration when designing the system.
1.2 Application examples
S Work access platforms
S Lifting platform
S Harvesters
S Municipal equipment
S Snow/ice clearing equipment
S Wood chippers
S Raod rollers
S Tail lifts
2 Symbols
2 part-flows 3 part-flows 4 part-flows
Decompres
sion orifice
possible
Decompres
sion orifice
possible
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Flow Divider MTDA
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3 Technical data
General characteristics Unit Description, value
Maximum operating pressure bar 315
Fluid Mineral oil to DIN 51524
1)
Oil temperature range °C -20 ... +80
Viscosity range mm
2
/s
10 ... 300
Maximum admissible level of contamination of the
hydraulic fluid
ISO 4406 code 20/18/15
Nitrile seals NBR (Nitril-Butadin-Kautschuk)
Weight: MTDA08
MTDA16
MTDA..3F
MTDA..4F
kg
1,5
8
8,3
8,4
1) Other fluids on request.
4 Performance graph
Values refer to an viscosity of 35 mm
2
/s.
4.1 Division accuracy [%]
Division accuracy +/- 3% of the max. flow rate, based on
control flow range of the respective flow divider (see chapter 6).
30 40 50 60 70 80 90 100
4
3
2
1
0
-1
-2
-3
-4
Q
zu
[
%]
[%]
size 16
size 08
4.2 Pressure drop characteristics (np)
Pressure drop v. flow rate
4.2.1 MTDA08 / MTDA16
15
10
5
0
0 204060 80100
Q
20
Dp [bar]
Q
zu
[%]
size 16
size 08
4.2.2 MTDA..3F / MTDA..4F
Q
zu
[%]
Dp [bar]
0 25 50 75 100
50
40
30
20
10
0
size 16
size 08
IMPORTANT :Q
zu
= really inlet flow (0% = 0 l/min, 100% = maximum control flow)
Higher division accuracy on enquiry.
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Flow Divider MTDA
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5 Dimensions
5.1 MTDA08
40
54
7
67
45
124
48
5.2 MTDA16
34
6
196
92
184
100
68
52
80 0.5
85
9.5
15
70
5.2.1 Port threads
Flow range
[l/min]
Metric
Port P Port A + B
004 … 100 M22 x 1,5 M18 x 1,5
100 … 250 M33 x 2 M27 x 2
5.3 MTDA083F / MTDA084F
10
10
125
48
8.8
54
97
110
29.5
120
25
100
60
33
107
(2x) M8 x 14
5.3.1 Port threads
Flow range
[l/min]
Metric
Port P Port A+B Port C+D
008 … 100 M27 x 2 M22 x 1,5 M22 x 1,5
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Flow Divider MTDA
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6 Ordering code
6.1 MTDA08 / MTDA16
Flow divider
Bi-directional
Port thread
Nominal size 08
16
Control flow range [l/min]
MTDA08 MTDA16
004 = 2-4 025 = 12-25 100 = 35-100
006 = 3-6 032 = 16-32 120 = 40-120
008 = 4-8 050 = 25-50 160 = 50-160
012 = 6-12 075 = 37-75 200 = 60-200
016 = 8-16 100 = 50-100 250 = 75-250
Port threads
Standard: Metric = M
Division ratio, see section 6.4 ( no valid for division ratio 1:1)
Option (to be inserted by the factory)
MMT 0 0 4 3 008-D A /
6.2 MTDA083F
Flow divider
Bi-directional
Port thread
Nominal Size = 08
Tripple flow divider = 3F
Division ratio A to B+C 1:1 = 10
1:1,5 = 15 etc.
1)
Division ratio B to C 1:1 = 10
1:1,5 = 15 etc.
1)
Control flow range [l/min]
008 = 4-8 032 = 16-32
012 = 6-12 050 = 25-50
016 = 8-16 075 = 37-75
025 = 12-25 100 = 50-100
Port thread
Metric = M
08
-
10 10 025 MMT D A 3F
1) With unequal division: For the division ratio A to B+C, the larger part-flow must be at outlet B+C.
For the division ratio B to C, the larger part-flow must be at outlet C.
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6.3 MTDA084F
Flow divider
Bi-directional
Port thread
Nominal Size = 08
Fourfold flow divider = 4F
Division ratio A+B to C+D 1:1 = 10
1:1,5 = 15 etc.
1)
Division ratio A to B 1:1 = 10
1:1,5 = 15 etc.
1)
Division ratio C to D 1:1 = 10
1:1,5 = 15 etc.
1)
Control flow range [l/min]
008 = 4-8 032 = 16-32
012 = 6-12 050 = 25-50
016 = 8-16 075 = 37-75
025 = 12-25 100 = 50-100
Port thread
Metric = M
08
-
10 10 025 MMT D A 4F 10
1) With unequal division: For the division ratio A+B to C+D, the larger part-flow must be at outlet C+D.
For the division ratio A to B, the larger part-flow must be at outlet B.
For the division ratio C to D, the larger part-flow must be at outlet D.
6.4 Unequal division on enquiry
In the case of unequal division, the division ratio is shown
in the flow divider model code
e. g. 13 = 1 : 1,3
20 = 1 : 2
30 = 1 : 3
Ordering example:
Flow range: Q
zu
60 l/min with unequal division of 1 : 3
Flow divider: MTDA08-075M30
At an inlet flow rate of 60 l/min the unequal divisionprod. :
15 l/min at port A and 45 l/min at port B
6.5 Example for division accuracy
Flow range: Q
zu
60 l/min, required division of
QA/QB = 30 l/min (division 1 : 1)
Flow divider: MTDA08-075M
flow range 37...75 l/min
max. flow rate 75 l/min
max. allowable deviation = 75 l/min x 3% = 2,25 l/min
resulting part- flow rate at Q
zu
60 l/min:
Port A - Q
min
= 27,75 l/min / Q
max
= 32,25 l/min
Port B - Q
min
= 27,75 l/min / Q
max
= 32,25 l/min
6.6 Example
Division MTDA083F2010050
A = 16,6 l/min
B = 16,6 l/min
C = 16,6 l/min
50 l/min
16,6
l/min
33,2
l/min
16,6
l/min
16,6
l/min
16,6
l/min
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Flow Divider MTDA
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7 End-stop synchronisation of
parallel-connected cylinders
When one of the two cylinders reaches its end-stop, the flow
to the other cylinder drops to approx. 5 - 10% of its nominal
rate. This pressure-dependent leakage flow enables the
other cylinder to slowly re-synchronise itself. To enable full-
speed re-synchronisation of the lagging cylinder, each actu
ator line from the flow divider must be equipped with a pres
sure relief valve.
8 Installation attitude and moun
ting
To prevent the weight of the spool causing division inaccur-
acies, the valve must be installed so that the spool axis is
horizontal. When mounting the valve, make sure that the
body is not subjected to any distorting forces. Do not use ta
pered-thread pipe fittings.
E 2024 by Bucher Hydraulics GmbH, D-79771 Klettgau
www.bucherhydraulics.cominfo.kl@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: 430.310.335.310.