4/3 and 4/2 Directional Spool Valves, ISO Size 03
Q
max
= 80l/min,p
max
= 350bar
Direct acting, solenoid operated
Series WEDO…
1/7
Reference: 400-P-181110-EN-01
Issue: 08.2021
S For controlling the starting, stopping,
and direction of a flow
S Manifold-mounting design, interface to ISO 4401-03-02
S Operated by DC or AC solenoids
S Very reliable functions and extremely stable
S With manual override
S Solenoid coils can be changed quickly and easily wi
thout leakage from hydraulics system.
1 Description
The WEDO-…-6… series of directional spool valves are so
lenoid operated, direct acting, manifold-mounting valves
with a size 03 interface to ISO 4401-03-02. The main
components of the valves are a steel body, either one or two
solenoids, the control spool, and either one or two return
springs. In the non-operated state, the return springs hold
the control spool in the middle position or initial position. The
control spool is operated by the DC or AC solenoids, which
are of the oil-immersed type. The integral manual override
can be used to move the spool without energising the coil,
for example during a power failure. These 4/3 and 4/2 direc
tional valves are used in plant and machines to control the
direction of a flow, and to stop the flow. The slip-on coils can
be replaced without opening the hydraulic envelope and
can be positioned at any angle through 4x90°. The version
WEDO-42-C-6... is fitted with a mechanical detent setting.
2 Technical data
General characteristics Description, value, unit
Designation 4/3 and 4/2 directional spool valves
Design flange design, direct acting, electrically operated
Mounting method 4 mounting holes for M5x30 mounting bolts
(valve mounting bolts supplied with the valve)
Tightening torque 5.2 Nm ± 10%
Size size 03 interface to ISO 4401-03-02
Weight - valve with one solenoid
- valve with two solenoids
1.60 kg
2.10kg
Mounting attitude horizontal recommended
(vertical mounting makes air bleeding difficult)
Ambient temperature range -20°C … +80°C
400-P-181110-EN-01/08.2021
Series WEDO…
2/7
Hydraulic characteristics Description, value, unit
Maximum operating pressure - ports A, B, P
- port T
350bar
210bar
Maximum flow rate DC
AC
80 l/min
60 l/min
Flow direction see table “Symbols / Spool types”
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
HEES biodegradable fluids;
for other fluids, please consult BUCHER
Hydraulic fluid temperature range -20°C … +80°C
Viscosity range 10…500mm
2
/s (cSt), recommended 15...250mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 20/18/15
Electrical characteristics Description, value, unit
Standard - Supply voltage 12V DC, 24V DC / 110V AC, 220V AC (50…60Hz)
Supply voltage tolerance ±10%
Ambient temperature range -20°C … +50°C
Nominal power consumption DC
AC
30/31 W
energising 225 VA (RMS) / holding 39 VA (RMS)
Switching time bei 40 l/min, 175 bar DC
AC
45 ms (energising)
28 ms (deenergising)
15 ms (energising)
23 ms (deenergising)
Depending on pressure, flow rate, pressure drop and viscosity as well as
dwell time under pressure, the switching times may vary from the the stated
values.
Relative duty cycle 100%
Protection class to ISO20653 / EN60529 IP65
(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-181110-EN-01/08.2021
Series WEDO…
3/7
3 Symbols / Spool types
4/2 functions 4/2 functions
with 4/3 spool types
4/2 functions
with 4/3 spool types
4/3 functions
a
WEDO‐42‐A…
AB
PT
a
WEDO-42-AD…
AB
PT
WEDO-42-BD…
b
AB
PT
WEDO-43-D…
ab
AB
PT
a
WEDO‐42‐AN…
AB
PT
WEDO-42- AG…
a
AB
PT
WEDO-42-BG…
b
AB
PT
WEDO-43-G…
ab
AB
PT
WEDO‐42‐B…
AB
PT
b
WEDO-42-AH…
a
AB
PT
AB
PT
WEDO-42-BH…
b
AB
PT
WEDO-43-H…
ab
AB
PT
WEDO‐42‐BN…
AB
PT
b
WEDO-42-AF…
AB
PT
a
WEDO-42-BF…
AB
PT
b
WEDO-43-F…
AB
PT
a b
WEDO‐42‐C…
AB
PT
b
WEDO-42-AJ…
AB
PT
a
WEDO-42-BJ…
AB
PT
b
WEDO-43-J…
AB
PT
a b
Crossover positions
400-P-181110-EN-01/08.2021
Series WEDO…
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4 Performance graphs
measured with oil viscosity 33mm
2
/s (cSt), coil at steady-state temperature and 10 % undervoltage
Δp = f (Q) Pressure drop - Flow rate characteristic
A, B, C, D, F, G, H and J spool
0
Q [l/min]6050403020100
2
4
6
8
10
12
p [bar]
P0434.ai
4
3
2
1
5
678
Spool type
Flow direction
P % A P % B P % T A % T B % T A % B B % A
A / B / C 6 6 – 5 5 – –
AN / BN / CN 5 5 – 2 2 – –
D 5 5 – 2 2 – –
F 6* 4 6** 4 – 3 3 7 + + 7 + +
G 6 6 – 3* 1 3+ 1 – –
H 4 4 4 + 2 2 – –
J 6 6 8 4 4 – –
* in mid–position, B closed
** in mid–position, A closed
+ in mid–position, A + B closed
++ in mid–position, P closed
400-P-181110-EN-01/08.2021
Series WEDO…
5/7
p = f (Q) Performance limits with AC-solenoid coil
operating at 50 Hz
0
Q [l/min]6050403020100
50
100
150
200
250
350
p [bar]
P0435.ai
43 21
300
Spool type
Flow direc
tion
A 2
B 2
C 2
D 1
F 1
G 4
H 1
J 3
p = f (Q) Performance limits - wIth DC-solenoid coil
0
Q [l/min]8070504030100
50
100
150
200
300
350
p [bar]
P0436.ai
54 2 1
20 60
3
2
3
5
250
Spool type
Flow direc
tion
A 3
B 3
C 3
D 1
F 2
G 5
H 2
J 4
IMPORTANT!
The indicated performance limits apply when
symmetrical flows pass through the valve.
For non-symmetrical flows, the max. flows are
substantially reduced, in worst cases to 33%.
400-P-181110-EN-01/08.2021
Series WEDO…
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5 Dimensions & sectional view
4/3 spool valve (spring centred)
4/2 spool valve (pulse signal, detented)
AC = 200
DC = 220
74
AC = 63
DC = 73
AC = 63
DC = 73
87
27.3
25
48
48.1 1.7
1
4
2
3
AB
1)
4/2 spool valve (1-solenoid model, A or B side)
AC = 146
DC = 156
AC = 63
DC = 73
B
87
AC = 63
DC = 73
27.3
25
21.758.25
9
7.5
16.75
8.25
74
AC = 146
DC = 156
23
4
M
A
= 5.2 [Nm] ± 5%
M
A
= 2.7 [Nm] ± 5%
A
M5
2)
0,01/100
Rz max 4
4)
Seal kit NBR no. DS-150-V
3)
Item Qty. 5
)
Qty. 6
)
Description
1 4 4 O-ring no. 012 ∅ 9,25x 1,78 N90
2 1 2 O-ring no. 022 ∅25,12x1,78 N90
3 1 2 O-ring no. 213 ∅23,39x3,53 N90
IMPORTANT!
1)
With manual override
2)
Valve mounting bolts M5x30
(included in the delivery)
3)
Seal kit with FKM (Viton) seals no. DS-150-V
4)
Required surface finish on the
mounting face (valve pad)
5)
4/2 valves (1 solenoid)
6)
4/3 valves (2 solenoid)
400-P-181110-EN-01/08.2021
Series WEDO…
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6 Installation information
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.
IMPORTANT!
When fitting the valves, use the specified tighten
ing torque for the mounting bolts. No adjustments
are necessary, since the cartridges are set in the
factory.
7 Ordering code
WEDO = directional valve, solenoid operated, direct acting
42 = 4/2 function (2 operating positions)
43 = 4/3 function (3 operating positions)
… = spool type / symbol to section 3 – page 3 (e.g. AD, D, etc.)
6 = ISO size 03 interface
V = FKM (VITON) seals (standard)
(special seals - please contact BUCHER)
1 ... 9 = design stage (omit when ordering new units)
... = voltage e.g. 24 (24 V)
D = current DC
A = current AC
(blank) = DIN EN 175301-803 connection with mating plug (standard, IP65)
M100 = DIN EN 175301-803 connection without mating plug
additional plug-variants, please consult Bucher:
2-
Ex.
VWEDO 43- 6- G- 24 D _
8 Related data sheets
Reference (Old no.) Description
400-P-030101 (i-30) Size 03 interface to ISO 4401-03-02
E 2021 by Bucher Hydraulics AG Frutigen, CH-3714 Frutigen
www.bucherhydraulics.co
m
info.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: 430.300.-.315.305.300