BIFFI EFS2000v4 - Manual Operation and Failsafe Speed Setting

56
BIFFI FAIL SAFE ELECTRIC ACTUATORS, MODEL EFS2000V4
InstructIon and operatIng Manual
16 MANUAL OPERATION AND FAILSAFE SPEED SETTING
16.1 Hydraulic control group diagram
1 Single acting spring return hydraulic actuator
30 Hydraulic accumulator (piston type/spring return)
39 Selector position micro switch
352 Needle valve
356 Hydraulic filter
379 Check valve
395 Safety relief valve
398 N.O. poppet type solenoid valve (optional)
414 2/2 N.C. hand operated-spring return valve
526 Bidirectional flow regulator (adjustable setting)
527 Bidirectional flow regulator
540 Hand pump
621 Pressure gauge
966 Terminals enclosure
998 2/2 N.C. hand selector (auto/manual)
999 Electro magnetical latch
Electric
actuator
AUTOMATIC OPERATION
Electric
supply
Drain/Charge
connection
(plugged)
Exhaust
plug
Electric
actuator
MANUAL OPERATION
Electric
supply
Drain/Charge
connection
(plugged)
Exhaust
plug
Emergency closing operation
In case of electric supply failure, the electro-magnetical latch opens and
the actuator moves the valve in closing position by a spring.
Failsafe time regulation
The closing time is adjustable by the flow regulator 526.
Local manual operation to open
In case of loss of electric supply, switch the valve 998in manual mode
and actuate the hand pump 540 to open the actuator.
Local manual operation to close
With valve 998in ‘manual’ position, press the lever of hydraulic push
button 414, the actuator moves in closing position by a spring.
Notes
1. The diagram in shown for spring to close actuator.