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WAREX VALVE GmbH
Safety instructions / dangers:
Before working on the butterfly valve, the pipes must be de-pressurized.
Important: Never place your hand or other parts of your body into an open butterfly valve that has
not been released of energy (electric power + compressed air). This is extremely important
especially during cleaning.
The butterfly valves´ maximum surface temperature corresponds to the temperature of the
materials conveyed. The ignition temperatures of the gases surrounding the butterfly valves must
comply with the temperature classes stated in the operation manual. The equipment is to be
classified into temperature class T6 for a temperature of the materials conveyed of up to 68 °C,
into temperature class T5 for up to 80 °C, into temperature class T4 for up to 108 °C and into
temperature class T3 for a temperature of the medium of up to 160 °C. The admissible ignition-
and glowing temperatures of the dusts surrounding the butterfly valves must be adhered to as
stated in the operation manual. The ignition temperature of dispersed dusts must at least amount
to the 1,5 – fold of the temperature of the materials conveyed, and the glowing temperature of
dusts deposited on the valves (the maximum dust layer thickness may be 5mm) must at least
exceed the temperature of the materials conveyed by 75 K.
Especially dust deposits on the surfaces must be removed at regular intervals.
Use of the valve at product temperatures above +50° can cause the valve housing to become
extremely hot. Protective measures must be taken to prevent burns to the skin. Especially for
valves with manual actuators, the operating personnel must be protected, e.g. by wearing
protective gloves.
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Coated valve disks must have a surface resistance of = 10
O (measured at 23 °C and 50%
rel. humidity). If dusts with a minimum ignition energy (measured with induction) of = 3 mJ or
explosive gases, vapors or fog flow through the valve, then the seals used must have a
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surface resistance of = 10
O ( measured at 23°C and 50% rel. humidity). For gases of
category IIC, the valve disk must be grounded directly.
The interior of the butterfly valves must never have an insulating surface. In all devices, externally
applied chargeable layers and/or non-conductive layers must not be greater than 2mm for gases
and vapors of group II A and II B, and not greater than 0.2 mm for gases and vapors of group II
C.
In addition, provisions must be made to exclude blockage of the valve (which cancels the ignition
puncture resistance) or spark formation due to foreign bodies. The connection of electric
components must comply with the electric power data and may be performed only by authorized
and trained personnel.
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)
ATEX1-EN-D
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