Flowserve 4 Series Kämmer Pneumatic and Electropneumatic Actuators - Manual (Page 17)

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Flow Control Division
Kammer Control Valves
(7.4 Actuator assembly continued)
7.4.8 to 7.4.11 for actuator with positioner only.
7.2.8 Assemble the positioner using new O-rings, gas-
kets and filters and install the positioner body (see
figs. 11).
7.2.9 Install the balancing plate (10) so that the small
hole fits over the plastic range adjustment pin (see
fig.12), and the bevelled side faces the double
diaphragm (flat side to positioner).
7.2.10 Install the double diaphragm assembly (9) align-
ing the small hole in the diaphragm with the hole
in the diaphragm ring and the signal orifice in the
positioner body (see fig. 13).
7.2.11 Actuator without adjustable positioner spring
(see Fig 9)
Install the positioner cover (8), positioner cover
screws (7), positioner spring (6), seating ring (5),
retaining ring (4), and positioner spring boot (3).
Actuator with adjustable positioner spring
(see Fig 15)
Install the positioner cover, positioner cover
screws, positioner spring and positioner spring
boot. Thread adjusting nut onto actuator stem and
adjust roughly using the gauge (lower edge of
adjusting nut the underside of positioner cover).
7.2.12 Refit yoke rods (2) and yoke plate (1).
The actuator is now ready to be calibrated.
7.3 POSITIONER SERVICE
The KÄMMER integral positioner is designed to be a
maintenance free unit. However; moisture, oil and dirt
entering the positioner can dampen its performance,
which will cause the need for maintenance and repair.
When this happens, remove all internal parts and clean
them thoroughly. Replace all O-rings, filters and dam-
aged parts, and reassemble the positioner body ac-
cording to fig. 11.
Positioners with integral I/P transducers are more
sensitive to contaminants than those without. There-
fore, it is very important that all parts to be reused are
extremely clean and dry.
I/P transducer
To remove the I/P transducer, disconnect the wires
from the terminal block and loosen the set screw (19)
on the side of the positioner housing. The I/P trans-
ducer can then be pulled from the front of the posi-
tioner housing. The main cause of transducer mal-
function is a polluted air supply. Filters are situated in
the input and output orifices of the transducer and are
readily accessible after removing the O-rings. Apart
from the O-rings and filters the transducer contains no
user serviceable parts. The transducer is factory ad-
justed to exactly 4 – 20 mA or 0 – 20 mA (documented
by a sticker on the transducer cover) and an attempt to
field calibrate is not recommended. For repair and/or
calibration the transducer assembly should be re-
turned to Kämmer.