5
Operation – manual override
Type 3374 Actuator
The travel is adjusted on the red trunnion at
the side of the housing using a 4 mm hexa-
gon crank handle. Upon delivery, the crank
handle is mounted on the bottom of the
housing.
Type 3274 Actuator
Version with mechanical override –
Types 3274-12 / -16
Press the black release button at the top of
the housing. Move the rack-and-pinion gear
to the desired travel position by turning the
end of the shaft protruding from the housing
with a hex wrench (width across flats
SW 24).
The actuator returns to following the control-
ler signal as soon as the black button is re-
leased.
If you wish the valve to remain in the manu-
ally adjusted position, open isolating termi-
nal 81 as described in section 5.1.
Note!
Due to inner leakage, even the position of a
switched-off hydraulic actuator may be
changed by external or internal forces
(springs). Observe this if you wish the valve
to remain in OPEN position.
Version with electrical override –
Type 3274-23
The two pushbuttons on the side of the hous-
ing cover can be used to retract or extend
the actuator stem and thus move the control
valve to the desired travel position.
The actuator returns to following the control-
ler signal as soon as the button is released.
If you wish to deactivate the priority of the
controller signal, e.g. when starting up the
plant, and the valve is to remain in a certain
position, open isolating terminal 81 as de-
scribed in section 5.1.
EB 5868-1 EN
11
Operation – manual override
Summary of Contents for 3214
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