Flowserve 4 Series Kämmer Pneumatic and Electropneumatic Actuators - Manual (Page 15)

15
Flow Control Division
Kammer Control Valves
7 ACTUATOR DISASSEMBLY and ASSEMBLY
7.1 ACTUATOR DISASSEMBLY
(refer to figs. 9 and 11)
NOTE: To help reassembly note or mark the rela-
tionship between the parts to be disassembled.
7.1.1 Remove yoke plate (1) and yoke rods (2).
For actuators without positioner continue with
7.1.5.
7.1.2 Actuators without adjustable positioner spring
(see Fig. 9)
Remove the positioner spring boot (3), retaining
ring (4), seating washer (5), and positioner spring
(6).
Actuators with adjustable positioner spring
(see Fig. 15)
Loosen the set screw in the positioner spring
adjusting nut and remove the nut. Remove boot
and positioner spring.
7.1.3 Loosen and remove the positioner cover screws
(7), positioner cover (8), double diaphgram (9)
and balancing plate (10).
7.1.4 Remove the positioner (11). All inner positioner
parts are now accessible for replacement or main-
tenance (
for positioner details see figs. 10 and
11).
7.1.5 Loosen and remove all case screws (12).
DANGER: Actuators with high thrust spring sets
and/or actuators with 40 mm (1.5") stroke must be
held in a press to prevent possible injury when
removing the case screws.
7.1.6 Unscrew the zero adjustment lock nut (13).
7.1.7 The spring case and diaphragm case can now be
separated, and the springs removed.
7.1.8 Holding the actuator stem, unscrew and remove
the clamping nut (14) to service the actuator
diaphragm and diaphragm plate.
7.2 ACTUATOR ASSEMBLY
(refer to figs. 9 to 13)
7.2.1 Install the diaphragm and diaphragm plate on the
actuator stem. Use Loctite
® #242 on the threaded
portion of the actuator stem where the clamping
nut (14) is to be installed. Install and tighten the
clamping nut, being sure not to kink the dia-
phragm.
7.2.2 Place the spring set into the spring case so that
they sit in the recessed area of the case (15).
Smaller diameter springs are placed inside of
larger diameter springs.
7.2.3 Insert the actuator stem through the hole in the
spring case (15).
7.2.4 Install the zero adjustment locknut (13) on the
actuator stem and tighten it down fully to com-
pressing the springs.
DANGER: A press must be used to compress the
springs when high thrust spring sets are installed
or when actuator stroke is 40 mm.
7.2.5 Before inserting a new O-ring (16) in the dia-
phragm case, pack the O-ring groove with a multi-
temperature assembly paste
7.2.6 Replace the diaphragm gasket (17) and install the
diaphragm case onto the spring case assembly.
7.2.7 Install and tighten all case screws (12), washers
and nuts using a crisscross pattern.
Continued....