EB 3756 EN
8-1
Malfunctions
8
Malfunctions
The work described in this section is only to
be performed by personnel appropriately
qualified to carry out such tasks.
Risk of injury due to high pressure in the
device.
The booster valve is pressurized. Improper
removal of the installed booster valve can
lead to device components bursting and
cause serious injury.
Î
Depressurize the booster valve before re
-
moving it (disconnect the supply air and
protect it against unintentional reconnec
-
tion).
Crush hazard arising from moving parts on
the valve.
Control valves contain moving parts (actua
-
tor and plug stem), which can injure hands
or fingers if inserted into the valve.
Î
Do not touch any moving valve parts
while the control valve is in operation.
Î
Before performing any mounting or
installation work on the booster valve,
put the control valve out of operation by
disconnecting the supply air and control
signal. Protect it against unintentional
reconnection.
Î
Do not impede the movement of the actu
-
ator and plug stem by inserting objects
into the yoke.
Proceed as follows in the event of a malfunc-
tion:
Î
Check attachment.
Î
Check the pneumatic connection.
Î
Check ports (supply air, control pressure,
external pilot supply (when a pilot valve
is used) and output) and connecting
lines.
Î
Check the control valve to ensure it func-
tions.
8.1
Emergency action
Plant operators are responsible for emergen-
cy action to be taken in the plant.
Emergency action in the event of valve fail
-
ure is described in the associated valve doc
-
umentation.
DANGER
!
WARNING
!
Tip
Summary of Contents for 3756
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