GF PA11 - Special Hazards

59
Safetyonthejobcan,however,onlyberealizedifallthe
necessary measures have been taken. It is therefore the
responsibility of the system engineer and the operator
of such systems into which the valve with pneumatic
actuator has been built to plan such measures and
make sure they are carried out.
The operator must make certain in particular that
• thevalvewithpneumaticactuatorisonlyusedasit
was intended for (see Section 3),
• thedesignparameterscontrolairpressureand
voltage of electric subassemblies of the pneumatic
actuator, as indicated in the scope of order and deli-
very, are true and accurate,
• thepneumaticactuatorisonlyoperatedwhenin
perfect working condition and the safety devices for
the system supply of compressed air are regularly
checked to make sure they are in perfect order,
• onlyqualifiedandauthorizedpersonnelplan,con-
nect, and work with the actuator and that employees
areinstructedperiodicallyinjobsafetymattersac-
cording to the local regulations – especially as per-
taining to electrical equipment, and
• personnelisfamiliarwithandobservesthisinstruc-
tion manual and the information contained herein.
4.2 Special hazards
Single acting, fail-safe OPEN and CLOSE (type descrip-
tion FO and FC) pneumatic actuators have pre-loaded
springs that bring the valve into the predefined position
in case of compressed air loss. Dismantling these ac-
tuators is dangerous and may only be done by following
special repair instructions (avail able from GF!) and un-
der the guidance of a safety expert. Dismounting from
the valve may only be done in the safety position after
cutting off the compressed air supply.
Warning