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WAREX VALVE GmbH
Caution – aluminum housings must never be in direct contact with zone 0 + 20.
For metal sealing butterfly valves the minimum closing times ( see tables) must be maintained –
danger of sparks!
50
65
DN
Min.
0.04 0.05
allowable
closing time
in sec.
600 700
DN
Min.
0.47 0.55
allowable
closing time
in sec.
Flange connection
The dimensions of the Warex butterfly valves are such that they can be clamped between all
standard DIN and ANSI flanges. If the valve is used as an end element instead of an
intermediate element, then it must be possible to let off the medium without danger. The
dimensions of flanges and flange screw connections must comply with the operating instructions.
Please note, however, that butterfly valves designed for a specific flange size will not fit other
flanges. Make sure that the flanges are parallel, of good workmanship, have undamaged surfaces
and are connected in stress-free condition. For the design of the flange, see the sketch at the end
of these instructions.
The use of flange seals is not allowed for valves with rubber flange coatings. Flange gaskets are
used only for metal valve seals.
Installation
Before installation, the valve must be checked for proper functioning. Especially the sealing lips
for the flange seal must be in perfect condition.
Installed manual transmissions, electric and pneumatic actuators should be checked for smooth
running; never use force!!
Furthermore, make sure that the butterfly valve matches the required specification. The sleeve,
valve disk and shafts must be sufficiently stable for the flow medium. The indicated pressure
and temperature limits must be above the operational conditions.
Warex centric butterfly valves are suitable for both directions of flow; the seal and flow
characteristics are not affected by the direction.
For use in explosive areas, the valve and the measurement and control equipment must be
classified according to 94/9/EG for external (environment) and internal (pipe).
The valve housing must always be grounded (for potential equalization, see drawing 1007914
Mb). The bypass resistance must have a value of < 10
Before installation, the pipe must be expanded using a suitable tool – never misuse the valve for
this purpose.
For vertical installation, the butterfly valve must be installed with horizontal shafts, especially in
the case of larger nominal diameters. Closing the lower valve disk half in the direction of flow
produces a self-cleaning effect.
WAREX-VALVE GmbH – Stauverbrink 2 – 48308 Senden
Tel. +49 (0) 2536/9958-0 – Fax +49 (0) 2536/9958-29
Revised: 05.06.09/RevD/opz (Subject to change)
80
100
125
150
0.06
0.08
0.10
0.12
800
900
1000
1200
0.63
0.71
0.79
0.94
ATEX1-EN-D
200
250
300
0.16
0.20
0.24
1400
1600
1800
1.10
1.26
1.41
6
Ω compared with the ground.
400
500
0.31
0.39
2000
1.57
Page 2 of 8
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