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Spool valve
Spool valve

Spool valve intrinsically safe
NG10
Flange construction ISO 4401-05
◆ pilot operated
◆ 4/2-way impulse execution detented Ex ia I Ma
◆ 4/3-way with spring centred mid position Ex ia II C T5 / T6 Ga
◆ 4/2-way with spring reset xII 1 G Ex ia II C T6, T5
◆ Q = 160 l/min xI M1 Ex ia I Ma
max
◆ p = 350 bar
max

DESCRIPTION APPLICATION
Pilot operated 4-way valve in a 5 chamber system. The control of These valves are suitable for applications in explosion-hazard
the pilot valve takes place electrically. Very compact construction areas, open cast and also in mines. The direction of movement is
with corresponding low weight. The hydraulic control of the pilot determined by the position of the spool and its symbol. Pilot opera-
valve can be internal or external via an additional connection plate ted valves are used where large volume flows have to be controlled.
or the mounting interface depending on the type of pilot operation. Switching performance and leakage of the valves must be taken

Spool detented or with spring reset. Intrinsic safety is achieved by into account when designing the system.
limiting the electric energy in the solenoid circuit by means of a
separate intrinsically safe power supply. Therewith sparking is
prevented from forming.

SYMBOL

AB3 AB1 AB2
A B A B A B
a b a b a b
a b a b a b
P T P T P T

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

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

AEB* AE1 * EB2*
A B A B A B
a o b a b a b
a b a b a b
P T P T P T

AFB * AF1 * FB2 *
A B A B A B
o b a
a b a b
a b a b a b
P T P T P T

AGB AG1 GB2
A B A B A B
o b a
a b a b
a b a b a b
P T P T P T

* When the connections P and T are connected in the middle position, a back pressure cartridge is built in as standard in the case of internal
pilot oil supply (ti/pi). If this back pressure valve is not used (0, according to the type code), it must be ensured that a pilot pressure of minnimum
4 bar is present. The pressure difference of this cartridge has to be added to the pressure difference of the main valve (see characteristics)
which results in an overall value. Pilot control type xi is not available with a back pressure cartridge.

www.wandfluh.com Illustrations are not binding Data subject to change 1/6 Edition: 20 09 1.9-40 E
Page 337