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Solenoid operated spool valve
Solenoid operated spool valve

Solenoid operated spool valve with soft switching
NG4
Flange construction ISO 4401-02
◆ 4/3-way with spring centred mid position
◆ 4/2-way with spring reset
◆ Q = 20 l/min
max
◆ p = 350 bar
max

DESCRIPTION APPLICATION
Direct operated solenoid spool valve with 4 connections in 5 cham- Normal solenoid spool valves switch very quickly. This can lead to
ber design. With the solenoids deenergised, the spool is held in the shocks in the hydraulic system which can cause mechanical wear
center position by the spring (4/3), or switched back to the offset and have a negative effect on operation. The soft switching valves
position (4/2). The soft switching of the valve is achieved by means slow down and dampen the switching movements which benefits
of an optimum combination of the orifice and spool design. Precise the system. Optimum results can be achieved if all 4 connections
spool fit, low leakage, long service life time. Spool made from are connected and the valve is properly vented. Miniature values
hardened steel, valve body from high quality hydraulic cast steel. are used where both, reduced dimensions and weight are import-

Wide range of standard and special voltages. ant.

SYMBOL

AB1 AB2

A B
a b a b
a b a b
P T
ACB AC1 CB2
A B A B A B

a 0 b a b
a b a b
P T P T P T

ADB AD1 DB2
A B A B A B
0
a b a b
a b a b
P T P T P T

GENERAL SPECIFICATIONS HYDRAULIC SPECIFICATIONS
Designation 4/2-, 4/3-spool valve Working pressure p = 350 bar
max
Construction Direct operated Tank pressure p T max = 100 bar
Mounting Flange construction Maximum volume flow Q = 20 l/min, see characteristics
max
Nominal size NG4 according to ISO 4401-02 Leakage oil See characteristics
Actuation Switching solenoid Fluid Mineral oil, other fluid on request
Ambient temperature -25…+70 °C Viscosity range 12 mm /s…320 mm /s
2
2
if > +50 °C, then no undervoltage is Temperature range -25…+70 °C (NBR)
admissible fluid -20…+70 °C (FKM)
Weight 0,90 kg (1 solenoid) Contamination Class 18 / 16 / 13
1,25 kg (2 solenoids) efficiency
MTTFd 150 years Filtration Required filtration grade ß 10…16 ≥ 75,
see data sheet 1.0-50

www.wandfluh.com Illustrations are not binding Data subject to change 1/4 Edition: 22 09 1.4-23 E
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