4/2 and 4/3 Directional Spool Valves, ISO Size 03
Q
max
= 40l/min,p
max
= 160bar
Direct acting, solenoid operated
Series WEDL…
1/5
Reference: 400-P-181260-EN-02
Issue: 10.2024
S „Low Watt“ model (8W)
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
without leakage from hydraulics system
1 Description
The WEDC-…-4… series of directional spool valves are so
lenoid operated, direct acting, manifold-mounting valves
with a size 02 interface to ISO 4401-02-01. The main com
ponents of the valves are a steel body, either one or two so
lenoids, 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 energizing 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°.
2 Symbols / Spool types
4/2 functions 4/3 functions
a
WEDL-42-A…
AB
PT
WEDL-43-D…
ab
AB
PT
WEDL-43-G…
ab
AB
PT
Crossover positions
WEDL-43-H…
ab
AB
PT
NOTE! Other spool types on request.
400-P-181260-EN-02/10.2024
Series WEDL…
2/5
3 Technical data
General characteristics Description, value, unit
Designation 4/2 and 4/3 directional spool valves
Design manifold mounting, 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
2.10kg
Mounting attitude horizontal recommended
(vertical mounting makes air bleeding difficult)
Ambient temperature range -30 °C … +80 °C
Hydraulic characteristics Description, value, unit
Maximum operating pressure - ports A, B, P
- port T
160bar
210bar (static)
Maximum flow rate 40 l/min
Flow direction see table “Symbols / Spool types”
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
HEES biodegradable fluids;
Other fluids on request!
Hydraulic fluid temperature range -30 °C … +80 °C
Viscosity range 10…500mm
2
/s (cSt), recommended 15...250mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 20/18/15
Electrical characteristics Description, value, unit
Supply voltage 24V DC (50…60Hz)
Supply voltage tolerance +5 % /-10%
Nominal power consumption DC 8 W
Switching time bei 40 l/min. Und 100 bar 45 ms (energizing)
28 ms (de-energizing)
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 ISO20653 / EN60529 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-181260-EN-02/10.2024
Series WEDL…
3/5
4 Performance graphs
measured with oil viscosity 33mm
2
/s (cSt), coil at steady-state temperature and 10 % undervoltage
Δp = f (Q) Pressure drop - Flow rate characteristic
A, D, G and H spool
0
Q [l/min]403525201550
1
2
3
4
6
7
8
p [bar]
P0769.ai
1
10 30
2
3
5
4
5
6
Spool type
Flow direction
P % A B % T P % B A % T
A 6 5 6 5
D 5 2 5 2
G 6 1 6 1
H 4 2 4 2
p = f (Q) Performance limits - wIth DC-solenoid coil
operating at 50 Hz
0
403525201550
20
40
60
80
120
160
p [bar]
P0770.ai
4
2
1
10 30
3
100
Q [l/min]
Spool type
Flow
direction
A 1
D 1
G 3
H 1
IMPORTANT!
The quored max. flow rates apply when symmetri
cal flows pass through the valve.
For non-symmetrical flows, the max. flows are
substantially reduced, in worst cases to only 33%
of the above valves.
5 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.
400-P-181260-EN-02/10.2024
Series WEDL…
4/5
6 Dimensions & sectional view
Seal kit NBR no. DS-150-V
Item Qty. Qty. Description
4 2* 1** O-ring no. 022 ∅ 25,12x1,78 V70
5 2* 1** O-ring no. 213 ∅ 23,39x3,53 V70
6 2* 2** O-ring no. 114 ∅ 15,54x2,62 V70
7 4* 4** O-ring no. 012 ∅ 9,25x 1,78 V70
* 4/3 valves
** 4/2 valves
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.
400-P-181260-EN-02/10.2024
Series WEDL…
5/5
7 Ordering code
WED = directional valve, solenoid operated, direct acting
L = “low−watt“−version
42 = 4/2 function (2 operating positions)
43 = 4/3 function (3 operating positions)
… = spool type / symbol see capture symbols / spool types
6 = ISO size 03 interface
V=
FKM (Viton) seals (standard)
(spezial seals on request)
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
1−
Ex.
VWED 42− 6−G − 24 D _L
Other additional plug−variants on request
8 Related data sheets
Reference (Old no.) Description
400-P-030501 (i-31) Size 03 interface to ISO 4401-03-02
400-P-515101 (P-20) LRSA DIN plug
E 2024 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
