Flowserve 2 Series P0 Type Kämmer Pneumatic Actuator - Manual (Page 5)

5
Flow Control Division
Kammer Control Valves
6 REMOVING AND REPLACING ACTUATOR
General information
All repair work is best performed when the actuator is
removed from the valve body.
However, many service repairs and adjustments can be
accomplished in the field while the actuator and valve
body are still connected to each other.
WARNING: Ensure that the plug assembly is not rotated
with the plug seated. This may cause irreparable damage
to the seating faces.
Always remove the yoke (7) with the actuator as an
assembly.
6.1 Remove actuator
6.1.1 On actuators with air-to-close action partially vent
actuator, on actuators with air-to-open action apply
supply pressure to raise the plug (half stroke).
CAUTION: Galling of critical surfaces may result if the
plug is not correctly positioned between seat ring and
bonnet.
6.1.2 With a wrench, hold the actuator stem to prevent it from
rotating while using a second wrench to loosen the plug
stem locknut on the plug stem (27) or coupling screws
(28).
6.1.3 Loosen the packing nut as far as possible.
6.1.4 Loosen the slotted nut as far as possible.
6.1.5 Completely rotate the actuator off the plug stem by
continuously loosening locknut, packing nut and slotted
nut ensuring that the plug stem does not rotate in the
bonnet.
CAUTION: Do not allow the plug to drop and impact
against the seat after turning the actuator off the plug
stem threads.
6.1.6 When the actuator is free release supply pressure and
remove actuator.
6.2 Replace actuator
The actuator stem must be fully extended:
Actuators with air-to-open action must be fully vented.
Actuators with air-to-close action apply supply pressure.
6.2.1 As required remove packing nut and slotted nut from
the valve bonnet.
6.2.2 Manually depress the plug stem to ensure the plug is
fully seated.
6.2.3 Place the actuator over the valve adding slotted nut,
and packing nut.
6.2.4 Thread the plug stem locknut as far as possible onto
the plug stem.
6.2.5 Engage the plug stem and coupling threads and rotate
actuator in a clockwise direction until the clearance
between the yoke base and the bonnet seating face is
around 2 mm.
WARNING: Ensure that the plug assembly is not rotated
with the plug seated. This may cause irreparable
damage to the seating faces.
6.2.6 On actuators with air-to-close action partially vent
actuator, on actuators with air-to-open action apply
supply pressure to raise the plug (half stroke).
6.2.7 Tighten slotted nut.
6.2.8 With a wrench, hold the actuator stem to prevent it
from rotating while using a second wrench to tighten
the plug stem locknut against the coupling.
6.2.9 Tighten packing nut (see table 1).
6.2.10 Vent actuator and adjust travel indicator (9).
STOP!
STOP!