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The F783E Ex‐ia control head for process and bu erfly valves has been designed for single‐ac ng and double‐ac ng valve
actuators as well as for double seat and mul ‐posi on valves using a single solenoid valve.
The air switch is a 5/2 type, with common exhaust. Flow restrictors are installed in the exhaust line of both ports, meaning the
opera ng speed of the actuator can be controlled in both direc ons
Intake & exhaust air connec ons: 6.0mm "One Touch" push in air fi ngs
Working connec ons:
The pilot solenoid valve is provided with a push bu on to operate the pilot valve manually.
The SMC SYJ5153 air switching valve has also a manual operator, which is par ally obscured by the pilot valve, so should not
be used.
The switching posi ons of the actuator are reported to the control system by feedback signals from two switches mounted on
switch pillars within the housing.
The height and orienta on of these switches can be adjusted to accommodate the stroke length of all F257 and F272S type
actuators. This is achieved by adjus ng the screw on the switch pillar to raise or lower the switch and turning the switch
around in the retaining clip.
The ¼ turn actuators use a special adjustable target set to accommodate target rota on between 0 and 180°.
Pg 17
6.0mm "One Touch" push in air fi ngs or internal por ng op on when fi ed to the
F257 type actuator (for ¼ turn opera on) Integrated flow regulator in the air switch exhaust
air ports
F783E Ex‐ia
00‐ISN‐203_Rev B
29/01/2021
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