2/2 Logic Cartridge Valve, Size 10
Q
max
= 150l/min,p
max
= 420bar
Active Control, Seated Design, Soft Switching
Series WL22SDU…,WL22SDS1…
1/5
Reference: 400-P-140111-EN-01
Issue: 02.2023
S Active control
S Soft switching, or soft switching + snap action
S Seated valve spool with 4 mm nose and notch
S Area ratio 2 : 1
S High flow rates with low Dp
S Seat-valve shut-off from A " B and B " A
S No pilot oil consumption at Z
S With or without seal on the seated valve spool
S Various opening pressures
S With integral orifice for pilot port
S All external parts zinc plated, chromited (CrVI-free)
S Can be fitted in a line-mounting body
1 Description
Series WL22SDU... and WL22SDS1... actively controlled
2/2 logic valves are size 10, high performance screw-in car
tridges with an M27 x 2 mounting thread. The conical-seat
design ensures that the cartridges are leak-tight from A →
B and from B → A. When the same pressure exists at ports
A, B and Z, the valve spool is held in its closed position by
the ≥ 2bar compression spring. The A → B and B→A con
nection is opened or closed by relieving or pressurising the
pilot port Z, bearing in mind the corresponding area- and
pressure-ratios. The soft-switching feature is available in
two different versions which influence the opening behav
iour of the valve spool. In the case of the ”U” model, the soft-
switching is effective over the whole opening stroke of the
valve spool, and is affected by Δp and Q. With the ”S” (snap
action) model, however, soft switching is only effective dur
ing the beginning of the opening stroke. The switching times
are by governed by the clearance between the plunger and
the damping sleeve. The snap action of the ”S” version re
sults from the slot in the plunger, which causes rapid un
loading of the damping chamber. In this design, the length
of the overlap determines the snap start point. In addition,
the spool's 4 mm nose and integral notch reinforce the soft-
switching behaviour of both models. 2/2 logic cartridge
valves can be used in both mobile and industrial applica
tions. All external parts are zinc plated and chromited (CrVI-
free) and are thus suitable for use in the harshest operating
environments. If you intend to manufacture your own ca
vities or are designing a line-mounting installation, please
refer to the section ”Related data sheets”.
2 Symbol
WL22SDU…, WL22SDS1…
3 Technical data
General characteristics Description, value, unit
Designation 2/2 logic cartridge valve
Design actively controlled, conical-seat type, soft switching
Mounting method screw-in cartridge M27x2
Tightening torque 150 Nm ± 10%
Size Nominal size 10mm, cavity type DJ
400-P-140111-EN-01/02.2023
Series WL22SDU…,WL22SDS1…
2/5
Description, value, unitGeneral characteristics
Weight 0.21 kg
Mounting attitude unrestricted
Ambient temperature range -25°C… +80°C
Flow direction A → B / B → A, see symbol
Hydraulic characteristics Description, value, unit
Maximum operating pressure 420bar
Maximum flow rate 150l/min
Pressure drop Δp < 5 bar at 100l/min
Opening pressure - standard
- optional
2.0 bar
0.4
1)
/ 1.0
1)
/ 3.0 / 6.0 / 7.5
Hydraulic fluid HL and HLP hydraulic oils to DIN 51 524;
for other fluids, please consult Bucher
Hydraulic fluid temperature range -25°C… +80°C
Viscosity range 10…650mm
2
/s (cSt), recommended 15...250mm
2
/s (cSt)
Minimum fluid cleanliness level
Cleanliness class to ISO 4406:1999
class 20/18/15
1)
only recommended for use when the seated valve spool is not fitted with a seal.
4 Performance graphs
measured with oil viscosity 33 mm
2
/s (cSt)
Δp = f (Q) Pressure drop - Flow rate characteristic
P0013.ai
0
5
10
15
20
Q [l/min]1501251007550250
1
2
1 = cavity type DJ with annular groove
2 = cavity type DJ without annular groove
p = f (t) Soft-switching characteristic (Example)
P0012.ai
t [ms]
p [bar]
4
O
3
3 = soft switching, snap action
4 = soft switching
O = snap point
Attention:
The Δp characteristic is valid when the load pres
sure in the A → B / B → A connection is higher than
the opening pressure. If the load pressure is lower
than the opening pressure, the load pressure
must first rise to overcome the opening pressure
before flow can occur.
Attention:
Switching times vary with pressure, flow rate, etc.
The overall soft-switching behaviour is very heav
ily dependent on the usage and must be estab
lished in the particular application.
400-P-140111-EN-01/02.2023
Series WL22SDU…,WL22SDS1…
3/5
5 Dimensions, sectional view
I
3
I
2
I
1
L
73
57 16
308
4
1
2
5
3
6
A
Z
B
M27 x 2
A
Z
=100 %
A
B
=50 %
A
A
=50 %
Typenbezeichnung
Model code
Ø 34
I
3
I
2
I
1
I
4
L
M
A
=150 [Nm] ±10 %
M
A
=60 [Nm] ±10 %
L = overlap length
I
1
= plunger with axial slot
I
2
= damping sleeve
I
3
= damping chamber
I
4
= spool nose with notch
6 Installation information
Important
No adjustments are necessary, since the cartrid
ges are set in the factory.
Attention
Only qualified personnel with mechanical skills
may carry out any maintenance work. Generally,
the only work that should ever be needed is to
check and possibly replace the seals. When
changing seals, oil or grease the new seals thor
oughly before fitting them.
NBR seal kit no. DS-296-N
1)
Item Pcs. Description
1 1 O-ring No.119 ∅23.47x2.62 N90
2 1 O-ring No.116 ∅18.72x2.62 N90
3 1 O-ring No.114 ∅15.54x2.62 N90
4 1 O-ring No. 016 ∅15.60x1.78 N90
5 2 Backup ring ∅17.1x2.0x1.4 FI0751
6 2 Backup ring ∅15.3x2.0x1.4 FI0751
IMPORTANT!
1)
Seal kit with FKM (Viton) seals, no. DS-296-V
7 Area- and pressure-ratios
B
A
Z
A
Z
A
B
A
A
Area A
Z
: Area A
A
= 2 : 1
Area A
Z
: Area A
B
= 2 : 1
Area A
A
: Area A
B
= 1 : 1
400-P-140111-EN-01/02.2023
Series WL22SDU…,WL22SDS1…
4/5
8 Adjuster types (optional)
Type ”E” adjuster (WL22S.E2D...); can only be supplied
with series WL22SDU... valves.
Important
Can be used to limit the opening stroke, for exam
ple, or to block the valve spool in the closed posi
tion.
2)
52
9,5
24
16
5
M
A
=60 [Nm] ±10 %
”E” adjuster with ”P” tamper-proof cap (WL22S.P2D…); can
only be supplied with series WL22SDU... valves.
Important
Valve settings can be sealed by fitting the tamper-
proof cap. To fit the cap, the snap ring
2)
has to be
removed. Subsequent adjustment is only poss
ible by destroying the tamper-proof cap.
58,5
2)
Snap ring (remove for ”P” model)
9 Application examples
Simplified symbol
B
AT
L
Application with seat valve, featuring soft switching when
A → B / B → A opens
B
A
Ø 0,8
B
A
T
L
Z
V1
V3
V2
Application: accumulator charging, with soft pump switch-
off to vented bypass
B
A
Z
PT
Ø 0,8
V4
V5
V6
V7
Advantage
When the logic cartridge valve is open (flow A → B / B → A), there is no continuous flow of pilot oil to Z.
V1
= logic cartridge valve, soft-switching
V2
= 3/2 seat valve
V3
= shuttle valve
V4
= logic cartridge valve, soft-switching, or snap action
V5
= 2/2 spool valve
V6
= pressure accumulator
V7
= pressure switch
400-P-140111-EN-01/02.2023
Series WL22SDU…,WL22SDS1…
5/5
10 Ordering code
U=
WL22 = 2/2 logic cartridge valve
S(∗
standard)
E=
D2 = orifice Ø 0.6
D3 = orifice Ø 1.5
D4 = orifice Ø 1.4
D5 = orifice Ø 1.3
D7 = orifice Ø 1.1
D8 = orifice Ø 1.0
D9 = orifice Ø 0.9
D0 = orifice Ø 0.7
1(∗
2(∗
B ... Q =
Z ... R = special feat
10 = nominal size 10 mm
V = Viton seals
1 ... 9 = design number (omit when ordering new units)
_
10−BEx.
_
WL22 4D12SD
_
U −
(∗
WL22SU2
3(∗
11 Related data sheets
Reference no. (Old no.) Description
400-P-040011 (i-32) The form-tool hire programme
400-P-060181 (i-45.11) Cavity type DJ
400-P-740131 (G-24.31) Line-mounting body, type GADJA (G3/4”)
E 2023 by Bucher Hydraulics AG Frutigen, CH-3714 Frutigen
www.bucherhydraulics.cominfo.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.-.305.320.335