Exchanging The Range Spring - Samson 4765 Mounting And Operating Instructions

2. Increase the input signal and slowly re-
duce it again to 1 bar. Check whether
the valve starts to move at exactly
0.1 bar.
Correct any deviation at the zero adjust-
ment screw (4).
Î Turn it counterclockwise to move the
valve earlier from its final position
Î Turn it clockwise to move the valve later
from its final position
Upper range value (span) e.g. 0.2 bar
3. Once the starting point has been set, in-
crease the input signal to 0.2 bar at the
pressure adjuster.
At exactly 0.2 bar, the plug stem must
stand still, having moved through 100 %
travel (watch the travel indicator at the
valve).
4. If the upper range value is incorrect,
move the pin (2) to correct it. Readjust
1 bar and turn the zero adjustment screw
(4) until the pressure gauge indicates the
required signal pressure (see also 6.2).
If no pressure gauge has been installed,
set the starting point to 0.97 bar instead.
7.4 Exchanging the range
spring
If the range is to be altered or changed to
split-range operation, replace the range
spring as shown in Fig. 1 as follows:
1. Unscrew screw (7) on the range spring.
Undo hexagon socket screw (5) and pull
out the lever together with shaft.
EB 8359-1 EN
2. Exchange range spring. Slide lever with
shaft through sleeve (3), positioner hous-
ing and bracket (6.1).
3. Secure range spring with the screw (7).
4. Move bracket and shaft until the screw
(5) sits on the flattened part of the shaft.
Tighten screw (5). Allow for a play of
0.05 to 0.15 mm between the lever (1)
and the sleeve (3) as well as between the
range spring (6) and the positioner hous-
ing.
Operation
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