Flowserve 4 Series Kämmer Pneumatic and Electropneumatic Actuators - Manual (Page 9)

9
Flow Control Division
Kammer Control Valves
5.3 Actuator Springs - (fig. 5 pos. 1)
Different actuator spring sets are available depending on the actuator thrust requirements and the fail
position of the actuator. The appropriate spring set can be chosen from the spare parts list.
5.4 Zero Adjustment Locknut - (fig. 5 pos. 2)
The zero adjustment locknut is used as a mechanical stop so that the actuator just begins to travel when
the desired signal is applied to the positioner.
5.5 Range Adjustment - (fig. 5 pos.3)
(Actuator with positioner only)
The actuator travel is adjusted by means of the range adjustment screw. Turn the range adjustment screw
so that the actuator stem travels the required distance in response to the positioner input signal.
5.6 Positioner Spring - (fig. 5 pos. 4)
(Actuator with positioner only)
To change the signal range from full to split range the positioner spring must be changed.
Examples:
from 3-15 psi to 3-9 psi or 9-15 psi
from 4-20 mA to 4-12 mA or 12-20 mA
Notice that split ranging on electro-pneumatic actuator is also done by means of the positioner spring.
After removal of the spring boot and retaining ring on older actuators or by removing the boot, positioner
spring adjustment nut on newer actuators, the spring can be replaced.