ATEX UNLOADER AND RELIEF VALVES
SAFETY NOTE
SN03
Rev. 00
Date 27/10/2020
Pag. 4 of 10
2.2 FIELD OF APPLICATION
The valve is designed to be used with water up to 70 °C, with addition of mild detergents or disinfectants. In case of
use with special or even flammable liquids (different viscosity, chemical harshness or other), please contact our
technical department. The valve shall be used within pressure and temperature reported in the official documents,
such as declaration of conformity, certificate of assembly and technical data reported on the instruction manual.
The fluid shall have an ignition temperature of minimum 50 K over the maximum exterior temperature of the
appliance’s surface where the cleaning liquid is utilized.
The ambient temperature when the appliance is working shall range between 0 ÷ +70 °C. For a different use, please
contact the manufacturer for a customized study.
Only when it’s used according to the prescriptions included in this manual and in correctly tackling residual risks
raising from its use, does this valve assure a level of protection high enough as to not generate potential sources of
priming, when installed in a potentially explosive environment.
The appliance in question grants that potential sources of priming are not activated in normal functioning and even in
case of foreseeable and rare failure or malfunction.
Breakage or failure to the appliance can happen. In that case, it is necessary to check the causes of failure. When
these are traced down to the appliance, they must be removed.
Note 1: the appliance reaches a maximum surface temperature according to the temperature of the fluid pumped in.
The temperature class must take into account the safety factor 0,8 aimed for appliances of class 1, see table below.
FLUID TEMPERATURE
°C
TEMPERATURE CLASS
(GAS)
MAX EXTERIOR SURFACE TEMPERATURE
(DUSTS)
0 to ≤ 70
T6
T85 °C
Note 2: the cleaning liquid is to be chemically compatible with the seals that have been assembled by the manufacturer
of the appliance. The marking will identify the material of the seals, as per the following chart:
MARKING ON THE EQUIPMENT
MATERIAL OF THE SEALS
E
EPDM
N
HNBR
K
FFKM
V
FKM
Compatibility (category - zoning) between the valve and the environment must be established by the user according
to exact and specific considerations Directive 99/92/EC.
It is not allowed to use the valves in potentially explosive atmospheres in underground and mining areas, EPL Ma and
Mb (group I category M1 and M2).
2.3 TERMS USED
