Differential Lock Valve
Series MT..DV (for 2 motors)
1/9
Reference: 100-P-000002-EN-14
Issue: 03.2019
S robust and reliable
S energy-optimised over the whole flow range
S simple control
S compact design offers space-saving installation
S reliable, uniform motion of the wheel-drives being con
trolled
1 Description
1.1 General
The differential lock valve consists essentially of a bi-direc-
tional flow divider (dividing and combining) and a directional
valve for optionally bypassing the flow divider.
It is intended for use in either open- or closed-loop hydro
static drives with parallel-connected hydraulic motors.
When the lock valve is switched OFF, the inlet flow can di
vide itself among the mo-tors in any required manner. When
the lock valve is switched ON, however, the inlet flow is di
vided into two pressure compensated portions in accord
ance with the division ratio of the lock valve. The motors are
thus driven at fixed speeds, regardless of their respective
loads. This arrangement prevents any hydraulic wheel
motor from spinning in conditions of poor traction. A balanc
ing orifice can optionally be arranged between the outlets A
and B. This allows some redistribution of flow and prevents
un-wanted torque build-up between wheels in these circum-
stances, and when turning.
The differential lock valves can be supplied with either hy
draulic, or electrohydraulic, actuation.
1.2 Application examples
S Harvester
S Highway finisher / pavers
S Forestry machines
S Agriculture machinery
S Ride-on mowers
S Lifting devices
2 Symbols
2.1 Hydraulic actuation
1
with make-up valve
with anti-shock valve
1
1
1 Balancing orifice can be fitted
100-P-000002-EN-14/03.2019
Differential Lock Valve Mt..DV
2/9
2.2 Electrohydraulic actuation
1
1
with make-up valve
with anti-shock valve
1
1
1 Balancing orifice can be fitted
3 Technical data
Hydraulical characteristics Unit Description, value
Size 08 Size 16
Nominal flow rate Q
max
l/min 100 250
Flow range
1)
2)
l/min 25, 50, 75, 100 120, 160, 200, 250
Operating pressure p
max
bar 420
Pilot pressure p
st
min.
- p
st
max.
bar 10 ... 30
Viscosity range mm
2
/s 10 ... 300
Maximum admissible level of contamination of the
fydraulic fluid
ISO 4406 class 20/18/15
achievable with a filter rating of ß
10
y75
Fluid temperature range °C -20 ... +80
Division ratio (for others, contact Bucher Hydraulics) 1:1
Fluids HL/HLP mineral oils DIN 51524; other fluids consult
Bucher Hydraulics
Electrical characteristics (type of actuation: EH) Unit Description, value
Voltage V DC Direct current voltage12 or 24
Power consumption W 18
Nitrile seals NBR
Duty cycle 100% ED
Ambient temperature °C max. +60
Coil temperature °C max. +180 (insulation class H)
Enclosure protection
(when connector plugs are properly fitted)
Connecting plug to DIN 43650 IP54
AMP Junior Timer (2-pole) IP65
Deutsch-plug DT04-2P-EP IP67
Electrical connection Connecting plug to DIN 43650:
AMP Junior Timer (2-pole)
Deutsch plug DT04-2P-EP
1) State the application's effective nominal flow when ordering.
2) Note the minimum flow per section 4.2.
100-P-000002-EN-14/03.2019
Differential Lock Valve Mt..DV
3/9
4 Performance graphs
Measured with viscosity 35 mm
2
/s.
4.1 Flow resistance
4.1.1 Dividing function switched OFF
In relation to the input Q
zu
volume flow rate.
20
15
10
5
0
0 50 100 150 200
Size 08
Size 16
250
Q
zu
[l/min]
Dp [bar]
4.1.2 Dividing function switched ON
In relation to the flow range.
Q
zu
[%]
Dp [bar]
Size 08
Size 16
0 25 50 75 100
20
10
0
4.2 Division accuracy
Percentage of the applicable flow range without a balancing
orifice between A and B (hole plugged).
30 40 50 60 70 80 90 100
Size 08
Size 16
4
3
2
1
0
-1
-2
-3
-4
Q
zu
[%]
[%]
100-P-000002-EN-14/03.2019
Differential Lock Valve Mt..DV
4/9
5 Dimensions
5.1 MT08DV (Serie index 3)
5.1.1 Hydraulic actuation
MT08DV…-*H-3***
13,5
57
24
58
110
8
9
82,5
33
84
93,5
32,5
85,5
20
140
65,5
10,5
9
9
Ø
1
1
5.1.2 Electrohydraulic actuation
MT08DV…-EH-3G…
13,5
57
42
24
58
110
120
10,5
9
82,5
33
84
93,5
32,5
140
Ø
8,5
1
1
1 Clearance holes for M8 mounting cap screws to DIN 912
100-P-000002-EN-14/03.2019
Differential Lock Valve Mt..DV
5/9
5.2 MT16DV (Serie index 2)
5.2.1 Hydraulic actuation
MT16DV...-*H-2***
90
58,6
1807
33
30,2
73
12 156
48,5 83
52,4 52,4
26,2
79
36
18
143
18,5
46
151
7
1
1
5.2.2 Electrohydraulic actuation
MT16DV...-EH-2G…
90
58,6
180
33
30,2
73
12
156
48,5
83
52,4 52,4
26,2
79
36
18
143
205
18,5
46
Ø8.4
1
1
1 Clearance holes for M8 mounting cap screws to DIN 912
5.3 Connection size
MT08DV MT16DV
Port Port threads Port Port threads
P M27 x 2 P M33 x 2 and SAE 1¼” (3000 PSI)
1)
A, B, C M22 x 1,5 A, B M27 x 2 and SAE 1” (3000 PSI)
1)
T, X M12 x 1,5 T, X M12 x 1,5
1) SAE-flange see datasheet 100-P-000049.
6 Models
6.1 Sockets
GDM plug to DIN 43650
G
AMP Junior Timer
J
Deutsch plug DT04-2P-EP04
T
100-P-000002-EN-14/03.2019
Differential Lock Valve Mt..DV
6/9
7 Ordering code
Differential lock valve = MT..DV
Nominal size = 08 or 16
Division:
1 : 1 = 10
1:1,5 etc.
)
= 15
1)
Control flow range:
per. sect. 3. e. g. 25 l/min = 025
Type of actuation:_
hydraulic = *H
electro-hydraulic = EH
Design no.
Plug connector:
GDM plug DIN 43650 = G
AMP Junior Timre = J
Deutsch plug DT04-2P-EP04 = T
Coil voltage:
DC 12Volt = 12
DC 24Volt = 24
with actuation type *H = ***
Options (see chapter 7.1):
with make-up valve = 01
with anti-shock valve and make up valve = 02
with make-up valve and inch-size port threads = 07
.
MT 0 8 D V
-
10
025
EH-
**
/
D ...
4)
12
G
1) With unequal division, the larger flow goes to port B
2) Size of balancing orifices must be plainly stated (see also sect. 2) e.g. 0.6 / 0.8 / 1.0 : if balancing orifice D is to be 0.8 mm, then D = 08
7.1 Options
In addition to the standard versions, differential-lock valves
can also be equipped with numerous auxiliary functions and
combined in customer-specific manifold blocks. In these
cases, technical datas and performance graphs may differ
from standard.
/01 = with make-up valve
/02 = with anti-shock valve
(pressure-relief + make-up valve)
/07 = with make-up valve and inch-size port threads
100-P-000002-EN-14/03.2019
Differential Lock Valve Mt..DV
7/9
8 Application example
8.1 2-wheel drive
P
A
B
8.2 4-wheel drive
P
A
B
9 Installation
Horizontal mounting is recommended. Do not bolt the valve
body onto an uneven mounting surface.
10 Fluid
Differential lock valves require fluid with a minimum cle
anliness level of ISO 4406 code 20/18/15.
We recommend the use of fluids that contain anti-wear
additives for mixed-friction operating conditions. Fluids wi
thout appropriate additives can reduce the service life of
pumps and motors.
The user is responsible for maintaining, and regularly
checking the fluid quality.
11 Fluid cleanliness class
Cleanliness class (RK) onto ISO 4406.
Code
ISO 4406
Number of particles / 100 ml
≥ 4 m ≥ 6 m ≥ 14 m
23/21/18 8000000 2000000 250000
22/20/18 4000000 1000000 250000
22/20/17 4000000 1000000 130000
22/20/16 4000000 1000000 64000
21/19/16 2000000 500000 64000
20/18/15 1000000 250000 32000
19/17/14 500000 130000 16000
18/16/13 250000 64000 8000
17/15/12 130000 32000 4000
16/14/12 64000 16000 4000
16/14/11 64000 16000 2000
15/13/10 32000 8000 1000
14/12/9 16000 4000 500
13/11/8 8000 2000 250
100-P-000002-EN-14/03.2019
Differential Lock Valve Mt..DV
8/9
12 System augmentation
12.1 Switch valve for traction drives
12.1.1 USV08 und USV16 series
These valves enable switching from a serial connection, for
example “drive mode,” into a parallel connection using a dif
ferential lock valve. For the user, such solutions mean reli
able output and fast operating speeds.
12.1.2 Application examples
S Sweepers
S Black-top pavers
S Cold milling machines
S Trench rollers
S Farm sprayers
12.1.3 Circuit diagram
USV08
MT08DV
X TAB
123 4
XTAB
P1 P2
USV16
USV08
X
T
X P
A
B
100-P-000002-EN-14/03.2019
Differential Lock Valve Mt..DV
9/9
12.1.4 Technical data
Hydraulical characteristics Unit
Description, value
Size 08 Size 08
Operating pressure p
max
bar 420 420
Nominal flow rate l/min 120 160
Dimensions (valve body without solenoid) mm 160x105x130 220x118x185
Ordering information and order number USV08-1J12 =
100032930
USV16-0G12 =
100028253
Fluid temperature range °C -20 ... +80
Viscosity range mm
2
/s 10 ... 300
Maximum fluid cleanliness ISO 4406 class 20/18/15 achievable with a filter
rating of ß
10
y75
Nitrile seals NBR (Nitril-Butadien-Kautschuk)
Port threads::
USV08
USV16
P1, P2, A, B = M27x2
T, C = M18x1,5
X = M14x1,5
according to DIN EN ISO 9974-1
1 - 4, A, B = M27x2
T = M14x1,5
X = M14x1,5
according to DIN EN ISO 9974-1
Electrical characteristics Unit Description, Value
Supply voltage VDC 12 or 24
Supply voltage tolerance $ 10%
Nominal power consumption W 27
Relative duty cycle 100%
Enclosure protection
(when connector plugs are properly fitted)
Connecting plug to DIN 43650 IP54
AMP Junior Timer (2-pole) IP65
Deutsch plug DT04-2P-EP IP67
Electrical connection Connecting plug to DIN 43650
AMP Junior Timer (2-pole)
Deutsch plug DT04-2P-EP
E 2019 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: 430.310.336.346.000
