4/3 and 4/2 Directional Spool Valves, ISO Size 02
Q
max
= 25l/min,p
max
= 250bar
Direct acting, solenoid operated
Series WEDC…
1/5
Reference: 400-P-180120-EN-02
Issue: 05.2016
S For controlling the starting, stopping,
and direction of a flow
S Manifold-mounting design,
interface to ISO 4401-02-01
S Operated by DC or AC solenoids
S Very reliable functions and extremely stable
S With manual override
S All exposed parts with zinc-nickel plating
S High pressure wet-armature solenoids
S The slip-on coil can be rotated, and it can be
replaced without opening the hydraulic envelope
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 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. All external parts of
the valve are zinc-nickel plated to DIN 50979 and are thus
suitable for use in the harshest operating environments.
The slip-on coils can be replaced without opening the hy
draulic envelope and can be positioned at any angle
through 360°.
2 Technical data
General characteristics Description, value, unit
Designation 4/3 and 4/2 directional spool valves
Design manifold mounting, direct acting, electrically operated
Mounting method 4 mounting holes for M5x40 mounting bolts
(valve mounting bolts supplied with the valve)
Tightening torque 5.2 Nm ± 5%
Size size 02 interface to ISO 4401-02-01
Weight - valve with one solenoid
- valve with two solenoids
0.90 kg
1.30kg
Mounting attitude unrestricted
Ambient temperature range -25°C … +80°C
Hydraulic characteristics Description, value, unit
Maximum operating pressure - ports A, B, P
- port T
250bar
160bar (static 250bar)
Maximum flow rate 25 l/min
Flow direction see table “Symbols / Spool types”
400-P-180120-EN-02/05.2016
Series WEDC…
2/5
Description, value, unitHydraulic characteristics
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
HEES biodegradable fluids;
for other fluids, please consult BUCHER
Hydraulic fluid temperature range -25°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
Supply voltage 12V DC, 24V DC / 115V AC, 230V AC (50…60Hz)
Supply voltage tolerance ±10%
Nominal power consumption V DC = 27 W / V AC = 25 W
Switching time 15 … 80 ms (energising)
10 … 40 ms (deenergising)
Depending on pressure, flow rate 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 IP 65 / IP 67 / IP 69K, see “Ordering code”
(with appropriate mating connector and
proper fitting and sealing)
Electrical connection 3-pin square plug to ISO 4400 / DIN 43 650 (standard)
for other connectors, see “Ordering code”
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
WEDC‐42‐A…
AB
PT
a
WEDC-42-AD…
AB
PT
WEDC-42-BD…
b
AB
PT
WEDC-43-D…
ab
AB
PT
WEDC‐42‐B…
AB
PT
b
WEDC-42-AG…
a
AB
PT
WEDC-42-BG…
b
AB
PT
WEDC-43-G…
ab
AB
PT
WEDC‐42‐C…
AB
PT
b
WEDC-42-AH…
a
AB
PT
AB
PT
WEDC-42-BH…
b
AB
PT
WEDC-43-H…
ab
AB
PT
WEDC-42-AF…
AB
PT
a
WEDC-42-BF…
AB
PT
b
WEDC-43-F…
AB
PT
a b
Crossover positions
WEDC-42-AJ…
AB
PT
a
WEDC-42-BJ…
AB
PT
b
WEDC-43-J…
AB
PT
a b
400-P-180120-EN-02/05.2016
Series WEDC…
3/5
4 Performance graphs
p = f (Q) Pressure drop - Flow rate characteristic
A / B / C spool
P0228.ai
0
2
4
6
8
10
12
Q[l/min]20 25151050
p [bar]
1
2
3
p = f (Q) Pressure drop - Flow rate characteristic
D spool
P0229.ai
0
2
4
6
8
10
Q[l/min]20 25151050
p [bar]
4
p = f (Q) Pressure drop - Flow rate characteristic
G spool
P0230.ai
0
2
4
6
8
10
Q[l/min]20 25151050
p [bar]
5
6
p = f (Q) Pressure drop - Flow rate characteristic
H / J spool
P0231.ai
0
5
10
15
20
25
30
Q[l/min]20 25151050
p [bar]
7
8
9
p = f (Q) Pressure drop - Flow rate characteristic
F spool
1)
(Q
max
20l/min)
P0232.ai
0
2
4
6
8
10
Q[l/min]16 2012840
p [bar]
10
11
12
IMPORTANT!
1)
F spool (F / AF / BF):
The maximum flow rate of 20 l/min refers to
symmetrical flow through the valve.
For differential cylinders (e.g. i = 1.46),
the maximum flow rate is restricted to 10 l/min.
Operated position
Spool type
Flow direction
P – A P – B A – T B – T
A / C 3 2 1 2
B 2 3 2 1
D / AD / BD 4 4 4 4
G / AG / BG 5 5 6 6
H / AH / BH 8 8 7 7
J / AJ / BJ 7 7 7 7
F / AF / BF
1)
12 12 10 10
Mid-position (de-energised position)
Spool type
Flow direction
P – A P – B B – T A – T P – T
H / AH / BH – – 8 8 9
J / AJ / BJ – – – – 9
F / AF / BF
1)
11 11 – – –
400-P-180120-EN-02/05.2016
Series WEDC…
4/5
5 Dimensions & sectional view
4/3 spool valve (spring centred)
4/2 spool valve (pulse signal, detented)
54.5
73.5
1
19
52.5
71.6
195.7
71.6
22.9
39.5
35
2
Ø 36
1
2
4
2)
M
A
= 5.2 [Nm] 5%
M
A
= 2.7 [Nm] 10%
AB
4/2 spool valve (1-solenoid model, A or B side)
73.5
19
1 22.9
54.5
9.9 30.1
7.7552.571.6
131.85
71.61
131.86
2
1
4
A
P
P
T
14.25
6.25
17.5
M5
3)
M
A
= 5.2 [Nm] 5%
M
A
= 2.7 [Nm] 10%
Ø 36
0,01/100
Rz max 4
5)
A B
Seal kit NBR no. DS-322-N
4)
Item Qty. Description
1 4 O-ring no. 011 7,65x1,78 N90
2 4 O-ring 16,00x2,00 FKM
IMPORTANT!
2)
With manual override
3)
Valve mounting bolts M5x40
(included in the delivery)
4)
Seal kit with FKM (Viton) seals no. DS-322-V
5)
Required surface finish on the
mounting face (valve pad)
400-P-180120-EN-02/05.2016
Series WEDC…
5/5
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
W = directional valve
E = solenoid operated
D = direct acting
A ... Q = standard model - see relevant data sheets
Z ... R = special features - please consult BUCHER
42 = 4/2 function (2 operating positions)
43 = 4/3 function (3 operating positions)
… = spool type / symbol to section 3 – page 2 (e.g. AD, D, etc.)
4 = ISO size 02 interface
(blank) = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
(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) = ISO 4400 / DIN 43 650 connection with mating plug (standard, IP65)
M100 = ISO 4400 / DIN 43 650 connection without mating plug
C = Kostal plug connection (IP65)
JT = Junior Timer radial plug connection (with protection diode, IP65)
IT = Junior Timer axial plug connection (with protection diode, IP65)
D = Deutsch plug connection DT04-2P (IP67/69K) mating plug not supplied
DT = Deutsch plug connection DT04-2P (with protection diode, IP67/69K)
S = AMP Superseal 1.5 (IP67) / Metri-Pack 150 (IP65) plug connection
F = flying leads (500 mm)
1
_
-
Ex.
_
CDEW 43- 4- D- 24 D
8 Related data sheets
Reference (Old no.) Description
400-P-030101 (i-30) Size 02 interface to ISO 4401-02-01
400-P-120110 (W-2.141) Coils for screw-in cartridge valves
E 2016 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