BIFFI EFS2000v4 - Adjustment of Angular Stroke

6
BIFFI FAIL SAFE ELECTRIC ACTUATORS, MODEL EFS2000V4
InstructIon and operatIng Manual
For the adjustment of the stop screw proceed
as follows:
• Loosen the lock nut.
• If the actuator angular stroke is stopped
before reaching the end position (fully open
or closed), adjust the stop screw by turning
it counter clockwise until the valve reaches
the right position. When unscrewing the stop
screw, keep the lock nut still with a wrench
so that the sealing washer does not withdraw
together with the screw.
Adjusting the stop screw positioned on the
actuator housing
Adjusting the stop screw positioned on the
spring cartridge end flange
Position of the lock nut
on the actuator housing
5 ADJUSTMENT OF ANGULAR STROKE
It is important that the mechanical stops of the
actuator (and not those of the valve) stop the
angular stroke at both extreme valve positions
(fully open and fully closed), except when this
is required by the valve operation (e.g. metal
seated butterfly valves).
The adjustment of the angular stroke is
performed by adjusting the travel stop screw
mounted on the spring cartridge end flange
and the travel stop screw mounted on the
EFS2000v4 housing (seethe picture below).
• Tighten the lock nut.
• If the actuator angular stroke is stopped
beyond the end position (fully open or closed),
adjust the stop screw by turning it clockwise
until the valve reaches the right position.
• Tighten the lock nut.
WARNING!
The stop screw lock nut should never be removed
from the actuator.