EN 5.249.23.4/05.22
1
4/2- and 4/3-directional spool valve
Hydraulically operated
4WH 25
DESCRIPTION
The 4WH valves in nominal size 25 are
directional spool valves with hydraulic
operation. They are used to control the
start, stop and direction of a volume ow.
A wide variety of spool types and options
for opening control are available in this
valve series.
Nominal size 25
up to 600 l/min
up to 350 bar
CONTENTS
Description 1
Features 1
Model code 2
Spool types / symbols 2
Function 3
Section view 3
Technical data 4
Performance 4
Dimensions 5
Accessories 7
FEATURES
z Hydraulically operated directional spool valve
z Electro-hydraulic operation via pilot valve NG 6 or hydraulic operation via
interconnecting plate
z Flow rates up to 600 l/min
z The pilot supply and/or drain can be internal or external and can be achieved by
changing the plug
z Interface according to ISO 4401-08
EN 5.249.23.4/05.22
2
MODEL CODE
4WH E 25 G S01 /V /U
Type
4/2- or 4/3-directional spool valve, hydraulically operated
Control type
E = external pilot drain and supply
EI = external pilot supply, internal pilot drain
I = internal pilot drain and supply (symbols G and H only with option G)
IE = internal pilot supply, external pilot drain (symbols G and H only with option G)
Nominal size
25
Spool symbol
1)
See page 2
Series
S01 = CETOP 4.2-4 P05-320 (Standard)
Sealing material
N = NBR
V = FKM (standard)
Options
Not specied = without interconnecting plate (standard)
G = with check valve (5 bar)
UPA = with interconnecting plate P-A; B-T
UPB = with interconnecting plate P-B; A-T
1)
Other models on request
SPOOL TYPES / SYMBOLS
4/2-DIRECTIONAL SPOOL VALVES
Type Basic symbol With
intermediate position
C
T
A
P
B
T
A
P
B
X/Y X/Y
D
T
A
P
B
T
A
P
B
X/Y X/Y
Y
T
A
P
B
T
A
P
B
X/Y X/Y
For valves with electrical operation see brochure 5.227.10
"4WEH 4/2 and 4/3 way spool valves in nominal size 10 to 32".
4/3-DIRECTIONAL SPOOL VALVES
Type Basic symbol With
intermediate position
E
T
A
P
B
X/Y
T
A
P
B
X/Y
J
T
A
P
B
T
A
P
B
X/Y X/Y
G
T
A
P
B
T
P
H
T
A
P
B
X/YX/Y
T
A
P
B
Interconnecting plate PATB Interconnecting plate PBTA
Spool position depends on interconnecting plate.
EN 5.249.23.4/05.22
3
Control types – Pilot supply and pilot
drain
If the valve is used as a hydraulically
actuated valve, the pilot supply and pilot
drain will occur external via port X and Y.
If the valve is used as the main stage
in a pilot-operated valve, there are four
possible control types for each basic
valve. This can be seen in the model
code.
The valve will be delivered
correspondingly congured. Modication
is possible afterwards. The glued
threaded plugs will make disassembly
more dicult.
FUNCTION
The valves of the 4WH 25 series are
directional spool valves with hydraulic
operation which can control the start,
stop and direction of a volume ow.
They consist of the valve casing (1), the
main control spool (2) and the return
springs (3).
The uid power supply of the valve
is provided centrally via the standard
porting pattern.
Without pilot oil, the main control
spool is centred in its middle position
by the springs. The actuation of the
main control spool (2) is caused by
pressurisation. The required pilot
oil is provided by port X and Y or is
controlled by an additional pilot valve
that is adopted to the main valve. The
pilot pressure depends on rate of ow.
The minimal pilot pressure of 5 bar is
sucient only for low ow rates. Pilot
pressure has to be increased up to 12
bar by increasing rates of volume ow.
Pressure loading on one of the two
front sides of the main control spool
(2) with pilot pressure causes desired
switching position, whereby the required
ports will be linked. The spring, which
is across from the pressurised control
piston surface, causes the resetting of
the piston into zero or initial position by
relieving of pressure.
SECTION VIEW
z Version "E" –
Pilot supply is external from a
separate uid power supply via port
X. The pilot drain is also external via
port Y.
z Version "EI" –
Pilot supply is external from a
separate uid power supply via port
X. The pilot drain is internal via port T.
z Version "IE" –
Pilot supply is internal via port P. The
pilot drain is external via port Y.
Hint: Symbols G and H only with
option G.
z Version "I" –
Pilot supply is internal via poer P. The
pilot drain is external via port T.
Hint: Symbols G and H only with
option G.
EN 5.249.23.4/05.22
4
PERFORMANCE
Pressure drop
measured at ν = 36 mm²/s, T = 50 °C
Pressure drop Δp
Flow rate Q
Performance limits
measured at ν = 36 mm²/s, T = 50 °C
Pressure p [bar]
Flow rate Q [l/min]
Performance assignment to the associated spools:
Spool Switching
position
Pressure drop Performance
limits
P
→
A P
→
B A
→
T B
→
T P
→
T
D
Not
operated
1 3
1
Operated 1 2
E
Not
operated
1
Operated 1 1 2 3
J
Not
operated
4● 4○
1
Operated 1 1 1 2
H
Not
operated
6**
1
Operated 2 2 1 2
G
Not
operated
5
2
Operated 6 6 3 4
** A-B blocked ● B blocked ○ A blocked
TECHNICAL DATA
General specications
MTTF
d
: 150 - 1200 years, according to
DIN EN ISO 13849-1:2016; Table
C.1, Conrmation from ISO 13849-
2:2013; Tables C.1 and C.2
Ambient
temperature range: [°C]
-20 to +50
Installation position: No orientation restrictions
Weight: [kg] 15
Material: Valve casing: Cast iron
Name plate: Aluminium
Surface coating: Valve casing: Phosphate
plated
Hydraulic specications
Operating pressure: [bar]
350
Pilot pressure min: [bar]
5 to 12
2
Pilot pressure max: [bar]
210
Nominal ow: [l/min] 600
Operating uid: Hydraulic oil to DIN 51524 Part 1,
2 and 3
Media operating
temperature range: [°C] -20 to +80
Viscosity range: [mm²/s] 10 to 400
Permitted contamination
level of operating uid:
Class 20/18/15 according to ISO
4406
Sealing material: FKM (standard), NBR
1
see “Conditions and Instructions for Valves” in brochure 53.000
2
Pilot pressure depends on rate of delivery ow. The minimal pilot
pressure is sucient only for low rates of delivery ow. As the rate of
delivery ow increases, it is necessary to increase the pilot pressure up
to the specied maximum value.
1
EN 5.249.23.4/05.22
5
Mounting screws:
(not included in delivery)
6 Screws M12x60 ISO 4762
Tightening torque: 115 Nm (screws A 10.9)
DIMENSIONS
Interface according to ISO 4401-08-08-0-05 (CETOP 4.2-4-08-320)
Interconnecting plate
(not included)
EN 5.249.23.4/05.22
6
Plug
Plates
Check plate
P T A B
Interconnecting plates
PATB
P T A B
PBTA
P T A B
X: M6x8
for external pilot supply
Y: M6x8
for external pilot drain
Control type
Installation
Control
X Y
E
external pilot drain and
supply
● ●
hydraulically or
pilot operated
EI
external pilot supply,
internal pilot drain
● – pilot operated
I
internal pilot drain and
supply
– – pilot operated
IE
internal pilot supply,
external pilot drain
– ● pilot operated
EN 5.249.23.4/05.22
7
ACCESSORIES
Designation Part no.
Seal kits (6-part set)
29.82 x 2.62 -NBR -90 Sh (4 pieces)
20.24 x 2.62 -NBR -90 Sh (2 pieces)
3524659
29.82 x 2.62 -FKM -90 Sh (4 pieces)
20.24 x 2.62 -FKM -90 Sh (2 pieces)
3524660
Mounting screws (6 pcs) DIN EN ISO 4762-M12x60–10.9 3524698
Plug M6x8 -45H 3524750
Plates
Check plate -NBR 3611576
Check plate -FKM 3611580
Interconnecting plate PATB -NBR 3581660
Interconnecting plate PATB -FKM 3581661
Interconnecting plate PBTA -NBR 3581662
Interconnecting plate PBTA -FKM 3581663
Note
The information in this brochure
relates to the operating conditions and
applications described. For applications
or operating conditions not described,
please contact the relevant technical
department.
Technical modications are reserved.
HYDAC Fluidtechnik GmbH
Justus-von-Liebig-Str.
66280 Sulzbach/Saar, Germany
Tel.: +49 68 97 /509-01
Fax: +49 68 97 /509-598
E-mail: valves@hydac.com
EN 5.249.23.4/05.22
8