Flow Divider

Bi-directional

Series MTDA

1/6

Reference: 100-P-000052-EN-11

Issue: 07.2020

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.

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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3 Technical data

General characteristics Unit Description, value

Maximum operating pressure bar 315

Oil temperature range °C -20 ... +80

Viscosity range mm

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

1,5

8,3

8,4

4 Performance graph

Values refer to an viscosity of 35 mm

/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

-1

-2

-3

-4

[

[%]

size 16

size 08

4.2 Pressure drop characteristics (np)

Pressure drop v. flow rate

4.2.1 MTDA08 / MTDA16

0 204060 80100

Dp [bar]

[%]

size 16

size 08

4.2.2 MTDA..3F / MTDA..4F

[%]

Dp [bar]

0 25 50 75 100

size 16

size 08

IMPORTANT :Q

= really inlet flow (0% = 0 l/min, 100% = maximum control flow)

Higher division accuracy on enquiry.

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5 Dimensions

5.1 MTDA08

124

5.2 MTDA16

196

184

100

80 0.5

9.5

5.2.1 Port threads

Flow range

[l/min]

Metric Inch

Port P Port A + B Port P Port A + B

004 … 025 M18 x 1,5 M18 x 1,5 G⅜“ G⅜“

032 … 100 M22 x 1,5 M18 x 1,5 G½“ G⅜“

100 … 120 M27 X 2 M22 x 1,5 G¾“ G½“

160 … 250 M33 x 2 M27 x 2 G1“ G¾“

5.3 MTDA083F / MTDA084F

125

8.8

110

29.5

120

100

107

(2x) M8 x 14

5.3.1 Port threads

Flow range

[l/min]

Metric

Port P Port A+B Port C+D

004 … 100 M27 x 2 M22 x 1,5 M22 x 1,5

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6 Ordering code

6.1 MTDA08 / MTDA16

Flow divider

Bi-directional

Port thread

Nominal size 08

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 Metric = M

Inch = R

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.

Division ratio B to C 1:1 = 10

1:1,5 = 15 etc.

Control flow range [l/min]

004 = 2-4 016 = 8-16 50 = 25-50

006 = 3-6 025 = 12-25 75 = 37-75

008 = 4-8 032 = 16-32 100 = 50-100

012 = 6-12

Port thread

Metric = M (other port threads on request)

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.

Division ratio A to B 1:1 = 10

1:1,5 = 15 etc.

Division ratio C to D 1:1 = 10

1:1,5 = 15 etc.

Control flow range [l/min]

004 = 2-4 016 = 8-16 50 = 25-50

006 = 3-6 025 = 12-25 75 = 37-75

008 = 4-8 032 = 16-32 100 = 50-100

012 = 6-12

Port thread

Metric = M (other port threads on request)

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

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

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

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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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 2020 by Bucher Hydraulics GmbH, D-79771 Klettgau

www.bucherhydraulics.cominfo.kl@bucherhydraulics.com

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.