1/5
Type series: W1S_B...
Reference: 400-P-110416-EN-01/01.2022
- Slip-in cartridge valve
- For cavity AC
- All external parts with zinc-nickel plating according to
DIN EN ISO 19598
- Guided valve spool and poppet
- Control head is hard-anodized aluminium
Directional valve
3-way/2-position
Q
max
= 40 l/min, p
max
= 315 bar
pneumatical operation, direct acting, poppet type
Type series: W1S_B...
Description
The 3-way/2-position directional seat valves, series
W1S…, are size 6, pneumatically operated, direct ac-
ting, pressure balanced, push-in valves. In the normal
condition (non-operated), ow in port 1 is shut o
without leakage. They are designed on the tried and
tested principle of the guided poppet, and the guide
spool has a seal. This valve type has an overlapped
spool. In the crossover position, all connections are
thus disconnected, i.e., there is no connection bet-
ween ports 1, 2, and 3 during the valve’s switching
period, with the result that only a minimal loss of the
ow/pressure occurs. This is a very important bene-
t in small-volume circuits, and in accumulator- and
clamping systems. The pneumatic control head has a
G1/8“ threaded port for the air feed. All external parts
of cartridge are zinc-nickel plated, the aluminum con-
trol head is hard-anodized, and the valve is thus sui-
table for use in the harshest operating environments.
These valves are predominantly used in certain mobi-
le and industrial applications where leak-tight shut-o
functions are crucially important. Examples are where
loads, tensions, or clamping forces must be held wi-
thout leakage. For self-assembly, please refer to the
section related data sheets.
Symbol
13
2
2/5
Type series: W1S_B...
Reference: 400-P-110416-EN-01/01.2022
Technical data
General characteristics Description, value, unit
Function group Directional valve
Function 3-way/2-position
Design Slip-in cartridge valve
Controls pneumatical operation
Characteristic direct acting, poppet type
Transition/central position of spool/piston zero or overlap/positive (closed)
Construction size nominal size 6
Mounting attitude unrestricted
Weight 0.55 kg
Cavity acc. factory standard For cavity AC
Tightening torque steel 5.2 Nm
Tightening torque aluminium 5.2 Nm
Tightening torque tolerance ± 5 %
Minimum ambient temperature - 25 °C
Maximum ambient temperature + 80 °C
Surface protection
All external parts with zinc-nickel plating according to DIN EN
ISO 19598
Sealing material see ordering code
Seal kit order number NBR: DS-387-N / FKM: DS-387-V
Hydraulic characteristics Description, value, unit
Maximum operating pressure 315 bar
Maximum ow rate 40 l/min
Flow direction see symbol
Hydraulic uid
HL and HLP mineral oil according to DIN 51 524; other uids
on request!
Minimum uid temperature - 25 °C
Maximum uid temperature + 80 °C
Viscosity range 10 … 650 mm²/s (cSt)
Recommended viscosity range 15 … 250 mm²/s (cSt)
Minimum uid cleanliness (cleanlineless class according to ISO
4406:1999)
class 20/18/15
Pilot operating media compressed air
Pilot pressure min. 6.5 bar
3/5
Type series: W1S_B...
Reference: 400-P-110416-EN-01/01.2022
Performance graphs
measured with oil viscosity 33.0 mm²/s (cSt)
p = f (Q) Performance limit Δp = f (Q) Pressure drop-ow rate characteristic
400-PG-0559
0
50 (700)
100 (1400)
150 (2100)
200 (2900)
250 (3600)
300 (4300)
350 (5000)
Q [l/min (gpm)]
403020100
p [bar (psi)]
(10)(7.5)(5)(2.5)
1) = 1 → 2, 2 → 1, 2 → 3
2) = 3 → 2
1)
2)
400-PG-0419
0
10 (140)
20 (285)
30 (430)
40 (570)
Q [l/min (gpm)]
40
200
p [bar (psi)]∆
10 30
(10)
(5)(2.5
)(
7.5)
1) = 2 → 1; 2 → 3
2) = 1 → 2
3) = 3 → 2
1)1)
2)2)
3)3)
4/5
Type series: W1S_B...
Reference: 400-P-110416-EN-01/01.2022
Dimensions and sectional view
2
(0.07)
67.4
(2.65)
65.4
(2.57)
100
(3.93)
M5
4
32.6
(1.28)
7.6
(0.29)
□
40
(□1.57)
□
30.4
(□1.19)
G1/8''
Ø14.00×1.78
Ø15.60×1.78
Beispiel für die Masseinheit:
Example for the dimensional units:
LQFK
PP PLOOLPHWHU
0
$
3
2
1
Installation information
ATTENTION!
Only qualied 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 thoroughly before tting them.
NOTE!
1) When tting the slip-in valves, use
the specied tightening torque for the
mounting screws. The value can be
found in the chapter "Technical data".
Functional principle / Spool variants
The “overlapped spool” model features a closed cros-
sover characteristic i.e. during the valve's switching
period, there is no connection between ports 3, 2, and
1 and therefore only a minimal loss of ow/pressure
occurs. This is a very important benet in small-vo-
lume circuits, and in accumulator- and clamping sys-
tems.
5/5
Type series: W1S_B...
Reference: 400-P-110416-EN-01/01.2022
Ordering code
W1
= directional valve, poppet-type, direct acting
Ex.
A
…Q = standard model according to valid data sheet (standard)
Z…R
= special model after consultation
:
S
= 3-way/2-position, positive spool, pneumatical operation
6 %4
Q
= NBR (nitril-butadien-rubber / BUNA) seals (standard)
S
= FKM (fluorocarbon rubber / VITON) seals
1…9
= technical design no. (omit when ordering)
(special seals - please consult BUCHER)
Related data sheets
Reference Description
400-P-040011 Form tools
400-P-040111 Cavity AC
info.ch@bucherhydraulics.com www.bucherhydraulics.com
© 2022 by Bucher Hydraulics AG Frutigen, 3714 Frutigen, Switzerland
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.
