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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
200 - 300
350 / 400
500 - 600
700 - 900
1000
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:
II 1D/3DG c
Category 1D inside the valve / Category 3D or 3G outside the valve.
or
II 1D/2DG c
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.
\AT200F-ATEX-Betriebsanleitung (GB).doc (ZA) 21.09.2007
Operating instructions
GEFA / DOMINO valves
series AT 200F
ATEX II 1D/2DG c
pmax
[bar]
10
6
4
3
2,5
1 / 8
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Table of Contents
Related Manuals for Gefa AT 200F series
Summary of Contents for Gefa AT 200F series
- Page 1 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.
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Page 2: Maximum Surface Temperature
Category 1D inside the valve / Category 2D or 2G outside the valve. Operator’s duty of care GEFA valves are designed and manufactured after careful selection of the standards and technical specifications to be met. They are state of the art and allow the maximum level of safety during operation. - Page 3 Operating instructions GEFA / DOMINO valve AT 200F (ATEX II 1D/2DG c) Transportation To prevent damage and serious injury during transportation of the valve: • Only suitable and perfect load suspension devices and lifting tackle should be used. • Take the weight of the valve into account when selecting the load suspension device and lifting tackle.
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Page 4: Installation
Operating instructions GEFA / DOMINO valve AT 200F (ATEX II 1D/2DG c) Installation • Observe the maintenance and repair instructions for the individual components. • Danger: moving parts may cause injury. • Danger: Operation of electrically, pneumatically, or hydraulically-operated valves that have not yet been installed is not permitted. -
Page 5: Putting Into Operation
Operating instructions GEFA / DOMINO valve AT 200F (ATEX II 1D/2DG c) Putting into operation • Flush the pipe and valve and clean them of any impurities (e.g. welding residue). • Before finally putting the valves into service, all the important elements (plate, spindle, piston rod, etc.) must be cleaned thoroughly. -
Page 6: Normal Operation
Operating instructions GEFA / DOMINO valve AT 200F (ATEX II 1D/2DG c) Electrically-operated valves • Closing may be done exclusively according to our instructions, as follows: - only switch off in the closing direction by using a torque switch. - only switch off in the opening direction by using the path switch, the torque switch that is there serves as overload protection and must also be closed. -
Page 7: Maintenance And Repair
Operating instructions GEFA / DOMINO valve AT 200F (ATEX II 1D/2DG c) Maintenance and repair • Maintenance should only be carried out by qualified and authorized persons. • Observe the maintenance and repair instructions for the individual components. • Resistance to pressure impact and ignition: Resistance to pressure impact and ignition is achieved by the use of a sealing system as well as through component design. -
Page 8: Final Remarks
Operating instructions GEFA / DOMINO valve AT 200F (ATEX II 1D/2DG c) • Lubrication of valves with hand-wheel operation: The spindle must always be kept well greased and free of dirt. The greasing points on the hand wheel bearing must be regreased regularly depending on the conditions of operation and use.
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