Table of Contents
Advertisement
6 Operation
WARNING
!
Crush hazard arising from moving parts
(actuator stem).
Do not insert hands or fingers into the yoke
while the valve is in operation.
WARNING
!
Risk of personal injury when the actuator
vents.
Wear eye protection when working in close
proximity to the control valve.
NOTICE
!
Operating disturbed by a blocked actuator
stem.
Do not impede the movement of the actuator
stem by inserting objects into its path.
6.1 On/off service
In on/off service, the supply pressure must
be limited depending on the bench range or
signal pressure range of the actuator. The
applicable bench range or signal pressure
range which the actuator can move through
is written on the nameplate (see section 2.1).
Actuator stem retracts (FE)
For the direction of action "actuator stem re-
tracts (FE)", the permissible supply pressure
must not exceed the upper bench range val-
ue by more than 3 bar:
EB 8317 EN
Bench range
0.4 to 1.4 bar
1.4 to 2.3 bar
1.5 to 2.1 bar
Actuator stem extends (FA)
With "stem extends" direction of action, the
supply pressure can be 6 bar above the up-
per spring range value at the maximum.
With "stem extends" direction of action and
travel stop, the supply pressure must not ex-
ceed the upper spring range value by more
than 1.5 bar.
Additional points that apply concerning op-
eration:
Î Label actuators with reduced supply
pressure with a sticker ("Max. supply
pressure limited to ... bar").
Î Only apply the signal pressure to the sig-
nal pressure connection (S) on the dia-
phragm chamber of the actuator which
does not contain any springs (see Fig. 7).
Î Only use vent plugs that let air through
them (A1 in Fig. 3).
Operation
Max.
Fail-safe
supply
action
pressure
4.4 bar
Actuator stem
5.3 bar
retracts
5.1 bar
31
Advertisement
Table of Contents
