3.561.5275.201
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Fig. 4 Assembly of Actuator Adaptor, Valve Adaptor and Connectors
4.3
PN4000 Spring Retract Actuators
Note:
Adjustment of the spring will only alter the pressure of the control signal air at which the
valve commences to move off its seat (set point) and will not alter the spring pressure range
require to move the valve through its full travel i.e. 0.2 to 1.0 bar spring (range 0.8 bar) set to
commence to lift at 0.4 bar will require a 1.2 bar air pressure (0.4 + 0.8) to obtain valve full travel.
To adjust set point refer to fig. 2 and proceed as follows:-
Ensure the control valve has been isolated and the actuator housing is pressure free.
Loosen and remove connectors nuts and screws (21) and remove connectors (20).
Using two spanners whilst holding actuator spindle loosen actuator adaptor lock nut (18).
Apply the control signal pressure required to complete the full travel of the actuator spindle.
With the valve plug remaining on its seat adjust the actuator spindle adaptor until it presses
tightly against the valve spindle. Finger tighten lock nut (18).See Fig. 4 for correct installation.
Fit the connectors across the adaptors (17) and (19). Fit connectors locking screws and nuts
and tighten to 2 Nm.
Release the air control pressure and recheck that the valve just commences to move toward
the seat at the right spring range minimum pressure and is fully closed at the spring range
maximum pressure.
Finally bring the spindle at mid travel and tighten lock nut (18) to the right torque.
After the test check the position of the travel indicator against the "arrow" of the connector and
adjust its position accordingly.
Actuator Spindle
Valve Spindle
Lock Nut (22)
Valve Adaptor (19)
Connectors (20)
Actuator Adaptor (17)
Lock Nut (18)
Connectors Locking
Screws (21)
Summary of Contents for PN 3000 Series
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