\AT200F-ATEX-Betriebsanleitung (GB).doc (ZA) 21.09.2007
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II 1D/3DG c
II 1D/2DG c
Operating instructions
GEFA / DOMINO valves
series AT 200F
ATEX II 1D/2DG c
Product description
The GEFA valves series AT200F are provided for use in the area of solid substances. The valve is usable as a
product tight valve.
Valves of the AT 200 series can be installed between flanges or as inlet / outlet valves.
It has to be taken into account that a valve which is manufactured for a certain flange norm usually cannot be used
for other flanges. It has to be checked with the manufacturer if pipe flanges can be used which do not correspond
to the ordering specification.
Maximum operating excess pressure (pmax)
Independent of the PN level of the valves, the following maximum operating excess pressures (pmax) must be
heeded:
DN
pmax
[bar]
200 - 300
10
350 / 400
6
500 - 600
4
700 - 900
3
1000 2,5
Danger:
The maximum operating excess pressure refers to the working pressure of the valve.
The maximum or reduced explosion pressure usually exceeds the working pressure several times over.
For this reason, the limits of application according to 94/9/EG must always be observed.
Depending on the medium and operating conditions it can be necessary to reduce the working pressure
considerably in order not to exceed the limits of application according to 94/9/EG in the event of an explosion.
Limits of application acc. 94/9/EC
The valves have been designed for use in potentially explosive areas.
The valves have been classified in Device Group II. The following device categories are valid:
Category 1D inside the valve / Category 3D or 3G outside the valve.
or
Category 1D inside the valve / Category 2D or 2G outside the valve.
DN 200 – DN 600
The resistance to explosive pressure according to VDI 2263, Page 3 is 18 bar for the valve housing.
Valves in closed position are igniting disruptive resistant up to 10,1 bar against organic dust explosions of dust
explosion class St1.
DN 700
The resistance to explosive pressure according to VDI 2263, Page 3 is 10,1 bar for the valve housing.
Valves in closed position are igniting disruptive resistant up to 10,1 bar against organic dust explosions of dust
explosion class St1.
DN 800 – DN 1000
The resistance to explosive pressure according to VDI 2263, Page 3 is 6 bar for the valve housing.
Valves in closed position are igniting disruptive resistant up to 6 bar against organic dust explosions of dust
explosion class St1.
