Page 327 - Softbound_Edition_19_en

Spool valve
Spool valve

GENERAL SPECIFICATIONS ACTUATION
Designation 4/2-, 4/3-spool valve Solenoid spool valve direct operated
Mounting Flange construction Data sheet 1.2-33 (slip-on coil)
Nominal size NG10 according to ISO 4401-05 WDMFA04-AB1 / AB2 for 4/2-way AB1 / AB2
WDMFA04-AD1 / DB2 for other 4/2-way
Actuation Electrical WDMFA04-ADB for 4/3-way with spring centred mid position
Ambient temperature -25…+70 °C WDMFA04-ADB for 4/2-way impulse execution detented
if > +50 °C, then no undervoltage is
admissible
Weight 3,5 kg (1 solenoid)
3,8 kg (2 solenoids)
0,3 kg control plate
MTTFd 150 years

HYDRAULIC SPECIFICATIONS INSTALLATION NOTES
Working pressure p = 350 bar Mounting type Flange mounting
max
Tank pressure p T max = 160 bar (type of pilot operation 4 fixing holes for
te, pi, ae and xi) socket head screws M6 x 40
p T max = 100 bar (type of pilot operation ti, Mounting position Any, preferably horizontal
pe and xe) Tightening torque M = 13.5 Nm ± 10 %, quality min. 10.9
Pilot pressure p v min : 8…14 bar, see performance limits D
p v max = 350 bar for connection X (control M = 10.5 Nm ± 10 %, quality 8.8:
D
plate)
p v max = 200 bar for connection X ◆ maximum tank pressure without
(mounting interface) external connections: 80 bar
Pressure pilot oil drain minimum lower by p ◆ maximum tank pressure and
v min
Maximum volume flow Q = 160 l/min maximum pressure external
max
Leakage oil See characteristic and pilot valves connections: 35 bar
Fluid Mineral oil, other fluid on request Note! The length of the fixing screw depends on the base
Viscosity range 12 mm /s…320 mm /s material of the connection element.
2
2
Temperature range -25…+70 °C (NBR)
fluid -20…+70 °C (FKM)
Contamination Class 20 / 18 / 14
efficiency
Filtration Required filtration grade ß 10…16 ≥ 75,
see data sheet 1.0-50

SURFACE TREATMENT SEALING MATERIAL
◆ The main valve body, the distance plate, the screw plugs, the NBR or FKM (Viton) as standard, choice in the type code
slip-on coil and the armature tube are zinc-nickel coated
◆ The pilot valve body is coated with a two component paint

www.wandfluh.com Illustrations are not binding Data subject to change 3/6 Edition: 20 16 1.9-32 E
Page 327